Cutting device and battery cell preparation method

Abstract

The invention relates to a cutting device and a battery cell preparation method, and the cutting device comprises a first pressing mechanism which comprises a first pressing plate; the second pressing mechanism comprises a second pressing plate; a pressing gap for placing a lamination stack is formed between the first pressing plate and the second pressing plate, and the first pressing plate and the second pressing plate can be close to or far away from each other in the lamination direction of the lamination stack so as to press or loosen the lamination stack; the adjusting mechanism is used for adjusting the position of the lamination stack located in the pressing gap, and the cutting mechanism is used for cutting off at least the bottom layer diaphragm of the pressed lamination stack. Before the lamination stack is pressed, the bottom-layer diaphragm of the lamination stack is cut off, so that the condition that the bottom-layer diaphragm is adhered to the hot pressboard when the lamination stack is pressed is avoided, the precision of the hot pressboard is ensured, and a high-quality battery cell can be prepared.

Description

Technical Field

[0001] The present invention relates to the field of new energy technology, and in particular to a cutting device and a battery core preparation method. Background Art

[0002] Lithium batteries, with their high energy density, long life, fast charging and environmentally friendly features, have become the main energy storage device in the fields of electric vehicles, digital products, etc. The battery cell of a lithium battery includes an electrode and a separator, and the separator is used to separate the positive electrode from the negative electrode.

[0003] When preparing the battery cell, the diaphragm strip is laid in a Z shape, and the pole piece unit is set in the diaphragm strip to make a stack. The stack includes at least one stack group. After hot pressing, each stack group can form a battery cell. In this preparation method, the bottom layer of the stack has a diaphragm. During hot pressing, the bottom diaphragm will adhere to the hot pressing plate. Long-term production leads to insufficient precision of the hot pressing plate, which affects the quality of the battery cell. Summary of the invention

[0004] Based on this, it is necessary to provide a cutting device and a battery cell preparation method that can improve the quality of the battery cell in order to address the above problems.

[0005] A cutting device, comprising:

[0006] A first pressing mechanism, comprising a first pressing plate;

[0007] A second pressing mechanism includes a second pressing plate; a pressing gap for placing the laminate stack is formed between the first pressing plate and the second pressing plate, and the first pressing plate and the second pressing plate can move closer or farther away in the stacking direction of the laminate stack to press or loosen the laminate stack;

[0008] An adjusting mechanism and a cutting mechanism, wherein the adjusting mechanism is used to adjust the position of the laminate stack located in the compacting gap, and the cutting mechanism is used to cut off at least the bottom diaphragm of the compacted laminate stack.

[0009] In one embodiment, the first pressing mechanism further includes a first driving member, the first pressing plate is connected to the first driving member, and the first driving member is used to drive the first pressing plate to move along the stacking direction;

[0010] and / or

[0011] The second pressing mechanism further includes a second driving member, the second pressing plate is connected to the second driving member, and the second driving member is used to drive the second pressing plate to move along the stacking direction.

[0012] In one embodiment, the cutting device includes a robot, which is used to clamp the end of the laminate stack away from the side diaphragm and feed the laminate stack into the compaction gap;

[0013] The adjustment mechanism can abut against an end surface of the lamination stack having a side diaphragm to adjust the position of the lamination stack in the compression gap.

[0014] In one embodiment, the adjustment mechanism includes an adjustment plate and an adjustment drive member connected to each other;

[0015] The adjustment drive member is used to drive the adjustment plate to move so as to abut against one end of the lamination stack having the side diaphragm to adjust the position of the lamination stack.

[0016] In one embodiment, the robot comprises at least two groups of jaws arranged along the width direction of the bottom diaphragm, and there is a receiving gap between two adjacent groups of the jaws. The first pressing plate and the second pressing plate can extend into the receiving gap to press the stack of laminations.

[0017] In one embodiment, the cutting mechanism comprises a cutter and a first longitudinal driving member connected to each other, the cutter extends along the width direction of the bottom diaphragm, and the first longitudinal driving member is used to drive the cutter to move along the stacking direction to cut off the bottom diaphragm;

[0018] or

[0019] The cutting mechanism includes a second longitudinal drive member, a transverse drive member and a cutter, wherein the second longitudinal drive member is used to drive the cutter to move along the stacking direction until it passes through the bottom diaphragm, and the transverse drive member is used to drive the cutter to move along the width direction of the bottom diaphragm to cut off the bottom diaphragm.

[0020] In one embodiment, the cutting device further comprises an adsorption mechanism, and the adsorption mechanism is used to adsorb and drive the bottom diaphragm to separate it from the bottom isolation gasket.

[0021] In one embodiment, the second pressing plate is pressed against the bottom diaphragm;

[0022] The adsorption mechanism comprises a third driving member and a first adsorption plate connected to each other, the first adsorption plate and the second pressing plate are located on the same side of the stack in the stacking direction, and the first adsorption plate is located on one side of the second pressing plate in the width direction of the bottom diaphragm;

[0023] The third driving member is used to drive the first adsorption plate to approach the laminate stack along the stacking direction to adsorb the bottom membrane or to drive the bottom membrane away from the laminate stack to separate it from the bottom isolation gasket.

[0024] In one embodiment, the adsorption mechanism further includes a second adsorption plate, the second adsorption plate and the second pressing plate are located on the same side of the laminate stack in the stacking direction, and the second adsorption plate is located on one side of the second pressing plate in the width direction of the bottom diaphragm;

[0025] In the width direction of the bottom diaphragm, the second adsorption plate is disposed close to the second pressing plate relative to the first adsorption plate.

[0026] In one embodiment, the cutting device further includes a blowing member, which is used to blow air toward the bottom membrane adsorbed by the adsorption mechanism, so that the portion of the bottom membrane separated from the bottom isolation gasket is in contact with the second pressing plate.

[0027] In one embodiment, the cutting device further comprises a first dust removing member, and the first dust removing member is used for sucking the cut bottom membrane.

[0028] In one embodiment, the second pressing plate is pressed against the bottom diaphragm;

[0029] The first dust removal member has a first dust removal port, and the first dust removal port is arranged on the pressing surface of the second pressing plate for pressing the stack of laminations.

[0030] In one embodiment, the cutting mechanism is further used to cut off all side membranes of the laminate stack.

[0031] In one embodiment, the cutting device further comprises a second dust removing member, and the second dust removing member is used for sucking the cut side membrane.

[0032] In one embodiment, the adjustment mechanism comprises an adjustment plate and an adjustment drive member connected to each other; the adjustment drive member is used to drive the adjustment plate to move so as to abut against one end of the lamination stack having the side diaphragm to adjust the position of the lamination stack;

[0033] The second dust removal member has a second dust removal port, and the second dust removal port is arranged on the abutting surface of the adjustment plate for abutting against the lamination stack.

[0034] In one embodiment, the cutting device further comprises a fourth driving member and a mounting frame, the mounting frame is connected to the fourth driving member, and the first pressing mechanism, the second pressing mechanism, the cutting mechanism and the adjusting mechanism are all arranged on the mounting frame;

[0035] The fourth driving member is used to drive the mounting frame to move along the stacking direction, so as to drive the first pressing mechanism, the second pressing mechanism, the cutting mechanism and the adjusting mechanism to move synchronously along the stacking direction.

[0036] A method for preparing a battery cell comprises the following steps:

[0037] S1: Laying a diaphragm material strip in a Z shape, and arranging a pole piece unit in the diaphragm material strip to obtain a lamination stack, wherein the lamination stack includes at least one lamination group, and the lamination group includes a plurality of the pole piece units;

[0038] S2: cutting off at least the bottom diaphragm of the lamination stack;

[0039] S3: Pressing the laminate stack along the stacking direction, each laminate group forms a battery core.

[0040] In one embodiment, the step S1 comprises:

[0041] The diaphragm material strip is laid in a Z shape, and the pole piece unit and the isolation gasket are arranged in the diaphragm material strip to obtain the lamination stack, the isolation gasket is arranged between the lower surface of the pole piece unit at the bottom of the lamination stack and the diaphragm material strip, and the isolation gasket is arranged between the upper surface of the pole piece unit at the top and the diaphragm material strip;

[0042] The step S2 comprises:

[0043] Cutting off the bottom diaphragm and all side diaphragms along one end of the isolation gasket located in the diaphragm material strip;

[0044] The step S3 comprises:

[0045] The laminate stack is pressed along the stacking direction and the isolation gasket is removed to obtain at least one battery core.

[0046] The above-mentioned cutting device and battery cell preparation method cut off the bottom diaphragm of the laminate stack before pressing the laminate stack, thereby avoiding the bottom diaphragm from adhering to the hot pressing plate when pressing the laminate stack, ensuring the accuracy of the hot pressing plate, and being able to prepare high-quality battery cells. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 A front view of a cutting device provided in one embodiment of the present application ( Figure 1 Hidden manipulator in the middle);

[0048] Figure 2 for Figure 1 Axonometric view of a portion of the structure of the cutting device shown in ( Figure 2 The robot and the stack are shown in the figure);

[0049] Figure 3 for Figure 2 Front view of the structure shown in ( Figure 3 Hidden manipulator and stack of laminations);

[0050] Figure 4 It is an axonometric view of the lamination stack;

[0051] Figure 5 is a cross-sectional view of a lamination stack;

[0052] Figure 6 for Figure 3 The structure diagram behind the hidden manipulator in the middle structure;

[0053] Figure 7 For Figure 4 A top view of the lamination stack shown in ;

[0054] Figure 8 for Figure 3 A top view of the structure shown in;

[0055] Fig. 9 for Figure 1 An axonometric view of a partial structure of a cutting device shown in ;

[0056] Fig.10 A structural diagram of a cutting mechanism of a cutting device provided in one embodiment of the present application;

[0057] Fig.11 for Figure 3 Rear view of the structure shown in;

[0058] Fig.12 A structural diagram of a cutting mechanism of a cutting device provided in another embodiment of the present application;

[0059] Fig.13 for Fig. 9 A front view of the structure shown;

[0060] Fig.14 for Fig. 9 Rear view of the structure shown in;

[0061] Fig.15 A partial structural diagram of a cutting device provided in another embodiment of the present application ( Fig.15 The third dust removal member is shown in FIG.

[0062] Fig.16 for Figure 1 A rear view of the cutting device shown in ;

[0063] Fig.17 A flow chart of a method for preparing a battery cell provided in one embodiment of the present application;

[0064] Fig.18A flow chart of a method for preparing a battery cell provided in another embodiment of the present application;

[0065] Fig.19 for Fig.18 Schematic diagram of the scenario of the battery cell preparation method shown.

[0066] Description of reference numerals:

[0067] 100, cutting device; 10, first clamping mechanism; 11, first pressing plate; 12, first mounting plate; 20, second clamping mechanism; 21, second pressing plate; 22, second driving member; 23, second mounting plate; 30, adjustment mechanism; 31, adjustment driving member; 32, adjustment plate; 33, third mounting plate; 40, cutting mechanism; 41, first longitudinal driving member; 42, cutter; 43, second longitudinal driving member; 44, transverse driving member; 50, clamping gap; 60, mounting frame; 70, manipulator; 71, clamping claw; 72, accommodation gap; 8 1. third driving member; 82. first adsorption plate; 83. second adsorption plate; 84. adsorption hole; 90. blowing member; 110. first dust removal member; 1101. first dust removal port; 120. second dust removal member; 1201. second dust removal port; 130. third dust removal member; 140. fourth driving member; 150. frame; 160. fourth mounting plate; 200. lamination stack; 201. pole piece unit; 202. isolation gasket; 2021. cutting seam; 200a. lamination group; 203. bottom diaphragm; 204. side diaphragm; 300. battery cell. DETAILED DESCRIPTION

[0068] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention 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 present invention. However, the present invention 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 present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0069] In the description of the present invention, it is to 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”, etc., indicating orientations or positional relationships are 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 device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0070] 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 invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0071] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" 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.

[0072] In the present invention, 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.

[0073] 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.

[0074] See also Figure 1-Figure 3 In one embodiment of the present application, a cutting device 100 is provided, comprising a first pressing mechanism 10, a second pressing mechanism 20, an adjustment mechanism 30 and a cutting mechanism 40. The first pressing mechanism 10 cooperates with the second pressing mechanism 20 to press the stack 200, the adjustment mechanism 30 can adjust the position of the stack 200, and the cutting mechanism 40 is used to cut at least the bottom diaphragm 203 of the stack 200 (see Figure 4 and Figure 5 ).

[0075] Continue reading Figure 4 and Figure 5 , the laminate stack 200 includes at least one laminate group 200a. After the laminate stack 200 is pressed and separated, each laminate group 200a forms a corresponding battery cell 300. Optionally, an isolation gasket 202 is provided between the top electrode unit 201 of the laminate group 200a and the diaphragm material strip, and an isolation gasket 202 is provided between the bottom electrode unit 201 and the diaphragm material strip. The isolation gasket 202 plays the role of isolating the electrode unit 201 from the diaphragm. In this way, since the electrode unit 201 at the bottom and top of each laminate group 200a cannot be compounded with the diaphragm material strip under the action of the isolation gasket 202, and will not adhere to the isolation gasket 202, the bottom and top electrode units 201 will be exposed after the isolation gasket 202 is removed, and the obtained battery cell 300 can be a digital battery cell (in some cases, the battery cell of a digital product has the characteristics of light weight and thin thickness, and the electrodes are exposed on both sides of the outermost layer). The diaphragm at the bottom of the bottom stack 200a forms the bottom diaphragm 203 of the entire stack 200. When the stack 200 is formed by stacking, the diaphragm strip is laid in a Z shape to form a plurality of V-shaped grooves, and the opening directions of two adjacent V-shaped grooves are opposite. The isolation gasket 202 is located in the V-shaped grooves with the same opening direction, so that the side diaphragm 204 of the stack 200 is formed at the unopened end of the V-shaped groove where the isolation gasket 202 is placed. The cutting seam 2021 of the isolation gasket 202 is arranged close to the side diaphragm 204.

[0076] It should be noted that the stacking direction of the laminate stack 200 is Figure 1 and Figure 2 The Z direction in the figure is the width direction of the bottom diaphragm 203 or the width direction of the diaphragm strip mentioned below. Figure 2 In the X direction, if the width direction of the diaphragm strip is defined as the width direction of the stack 200, then Figure 2 The Y direction in FIG. 2 is the length direction of the lamination stack 200. It should be understood that in some other embodiments, the length direction and the width direction of the lamination stack 200 can be interchanged.

[0077] It is conceivable that in some other embodiments, the lamination stack 200 may also omit the isolation gasket 202, in which case the top pole piece unit 201 of each lamination group 200a is in direct contact with the diaphragm material strip, and the bottom pole piece unit 201 is in direct contact with the diaphragm material strip. In this case, the side diaphragm 204 is formed at one end of the lamination stack 200 in the length direction or the width direction.

[0078] For further information, see Figure 2 , Figure 3 and Figure 6The first pressing mechanism 10 includes a first pressing plate 11, and the second pressing mechanism 20 includes a second pressing plate 21. A pressing gap 50 for placing the laminate stack 200 is formed between the first pressing plate 11 and the second pressing plate 21. The first pressing plate 11 and the second pressing plate 21 can be close to each other in the stacking direction of the laminate stack 200 to press the laminate stack 200, and the first pressing plate 11 and the second pressing plate 21 can also be away from each other in the stacking direction of the laminate stack 200 to relax the laminate stack 200. The adjustment mechanism 30 is used to adjust the position of the laminate stack 200 located in the pressing gap 50, so that the cutting position of the laminate stack 200 is aligned with the cutting mechanism 40 in the stacking direction. When the cutting position of the laminate stack 200 is aligned with the cutting mechanism 40, and the laminate stack 200 is pressed by the first pressing plate 11 and the second pressing plate 21, the cutting mechanism 40 cuts off at least the bottom diaphragm 203 of the laminate stack 200 at the cutting position of the laminate stack 200.

[0079] In some embodiments, see Figure 4 and Figure 7 , the isolating gasket 202 has a cutting slit 2021 at one end located in the diaphragm material strip, and the cutting position of the laminate stack 200 is the position opposite to the cutting slit 2021. The adjustment mechanism 30 can adjust the cutting slit 2021 of the isolating gasket 202 of the laminate stack 200 located in the compression gap 50 to align with the cutting mechanism 40, and the cutting mechanism 40 can extend into the cutting slit 2021 to cut off the bottom diaphragm 203. It is conceivable that in some other embodiments, the isolating gasket 202 can also omit the cutting slit 2021, and in this case, the cutting position of the laminate stack 200 can be a position opposite to the side diaphragm 204 of the laminate stack 200.

[0080] The cutting device 100 provided in the embodiment of the present application places the laminated stack 200 before pressing in the pressing gap 50, and the first pressing plate 11 and the second pressing plate 21 are close to press the laminated stack 200 in the stacking direction to position it, and the adjustment mechanism 30 adjusts the position of the laminated stack 200 in the pressing gap 50 so that the cutting position of the laminated stack 200 is aligned with the cutting mechanism 40, and the cutting mechanism 40 can cut off the bottom diaphragm 203 of the laminated stack 200 that is pressed and aligned with it. In this way, before pressing the laminated stack 200, the cutting device 100 can cut off the bottom diaphragm 203 of the laminated stack 200, so as to avoid the situation where the bottom diaphragm 203 is adhered to the hot pressing plate when pressing the laminated stack 200, thereby ensuring the accuracy of the hot pressing plate and preparing high-quality battery cells 300.

[0081] Further reading Figure 1 and Figure 2The cutting device 100 includes a mounting frame 60, and the first pressing mechanism 10, the second pressing mechanism 20, the adjustment mechanism 30 and the cutting mechanism 40 are all arranged on the mounting frame 60. In this way, the cutting device 100 has a high degree of integration, a compact structure, and reduces the floor space. Of course, in some other embodiments, the cutting device 100 can also omit the mounting frame 60, and in this case, the various mechanisms are arranged independently of each other.

[0082] In some embodiments, the first clamping mechanism 10 further includes a first driving member, which is disposed on the mounting frame 60, and the first pressing plate 11 is connected to the first driving member, and the first driving member is used to drive the first pressing plate 11 to move along the stacking direction, so that the first pressing plate 11 and the second pressing plate 21 are close to or away from each other in the stacking direction. Figure 2 , Figure 3 and Figure 6 The second clamping mechanism 20 further includes a second driving member 22, which is disposed on the mounting frame 60, and the second pressing plate 21 is connected to the second driving member 22, and the second driving member 22 is used to drive the second pressing plate 21 to move along the stacking direction, so that the first pressing plate 11 and the second pressing plate 21 are close to or away from each other in the stacking direction. There is no limitation on the types of the first driving member and the second driving member 22, such as the first driving member and the second driving member 22 can be selected from motors or cylinders.

[0083] In some other embodiments, the first clamping mechanism 10 may include a first driving member, and the second clamping mechanism 20 may omit the second driving member 22, or the first clamping mechanism 10 may omit the first driving member, and the second clamping mechanism 20 may include the second driving member 22. At this time, one of the first pressing plate 11 and the second pressing plate 21 is used as a fixed pressing plate fixedly mounted on the mounting frame 60, and the other is used as a movable pressing plate movably mounted on the mounting frame 60, which can also achieve the purpose of the first pressing plate 11 and the second pressing plate 21 being close to or away from each other in the stacking direction. For example, in some specific embodiments, in the stacking direction of the laminate stack 200, the second pressing plate 21 is located at one end of the bottom diaphragm 203 of the laminate stack 200, that is, when the first pressing plate 11 and the second pressing plate 21 cooperate to compress the laminate stack 200, the second pressing plate 21 is in contact with the bottom diaphragm 203 of the laminate stack 200 (see Figure 2 ). At this time, the first pressing plate 11 can be set as a fixed pressing plate, and the second pressing plate 21 can be set as a movable pressing plate, so as to facilitate the subsequent unloading of the lamination stack 200 (described below). Of course, in some other specific implementations, there is no limitation on which of the first pressing plate 11 and the second pressing plate 21 is the movable pressing plate and which is the fixed pressing plate. For example, the first pressing plate 11 can also be set as a movable pressing plate, and the second pressing plate 21 can be set as a fixed pressing plate.

[0084] Optionally, continue to Figure 2The first clamping mechanism 10 further includes a first mounting plate 12, the first mounting plate 12 is connected to the mounting frame 60, and the first pressing plate 11 is connected to the first mounting plate 12, that is, the first pressing plate 11 is indirectly connected to the mounting frame 60 through the first mounting plate 12. Figure 3 The second clamping mechanism 20 further includes a second mounting plate 23, and the second mounting plate 23 is connected to the second driving member 22, that is, the second pressing plate 21 is indirectly connected to the second driving member 22 through the second mounting plate 23. In this way, the first pressing plate 11 or the second pressing plate 21 is indirectly connected to other structures through the mounting plate, so that the positions of the first pressing plate 11 and the second pressing plate 21 can be extended to avoid interference between the first pressing plate 11 and the second pressing plate 21 and other structures.

[0085] It is understandable that in some other embodiments, the cutting device 100 may also omit the first mounting plate 12 and the second mounting plate 23 , in which case the first pressing plate 11 is directly connected to the mounting frame 60 , and the second pressing plate 21 is directly connected to the second driving member 22 .

[0086] See also Figure 2 and Figure 8 , the cutting device 100 also includes a robot 70, which is used to clamp the end of the laminate stack 200 away from the side diaphragm 204 and feed the laminate stack 200 into the compaction gap 50. The adjustment mechanism 30 can abut against the end surface of the laminate stack 200 with the side diaphragm 204 to adjust the position of the laminate stack 200 in the compaction gap 50. Since the robot 70 clamps the end of the laminate stack 200 facing away from the side diaphragm 204 to feed the laminate stack 200 into the compaction gap 50, the adjustment mechanism 30 can abut against the end surface of the laminate stack 200 with the side diaphragm 204. At this time, the position of the laminate stack 200 into the compaction gap 50 can be controlled by controlling the robot 70. In some embodiments, the cutting seam 2021 of the isolation gasket 202 is along the feeding direction of the laminate stack 200 ( Figure 2 The cutting seam 2021 is then returned to align with the cutting position of the cutting mechanism 40 under the action of the adjustment mechanism 30, thereby avoiding the situation where the cutting seam 2021 is not delivered to the position of the cutting mechanism 40.

[0087] In some embodiments, see Figure 2 and Figure 8The manipulator 70 includes at least two groups of jaws 71, and the at least two groups of jaws 71 are arranged at intervals in the width direction of the bottom diaphragm 203. There is an accommodation gap 72 between two adjacent groups of jaws 71, and the first pressing plate 11 and the second pressing plate 21 can extend into the accommodation gap 72 to press the stack of laminates 200. In this way, on the one hand, the manipulator 70 clamps the stack of laminates 200 through at least two groups of jaws 71, ensuring the clamping effect of clamping the stack of laminates 200; on the other hand, when the manipulator 70 sends the stack of laminates 200 into the pressing gap 50, the first pressing plate 11 and the second pressing plate 21 can pass through the accommodation gap 72 to press the stack of laminates 200, so that the jaws 71 can withdraw from the pressing gap 50, thereby avoiding the interference of the jaws 71 with the operation of the adjustment mechanism 30 and the cutting mechanism 40.

[0088] Optionally, in the width direction of the bottom diaphragm 203, the first pressing plate 11 and the second pressing plate 21 include at least one pressing block, the spacing between two adjacent pressing blocks is greater than the width of the clamping jaws 71, and the width of the pressing block is less than the width of the accommodating gap 72, so that the first pressing plate 11 and the second pressing plate 21 can pass through the accommodating gap 72 to press the lamination stack 200. In some specific embodiments, the first pressing plate 11 includes three pressing blocks, and the second pressing plate 21 includes one pressing block. Of course, in other specific embodiments, the number of pressing blocks included in the first pressing plate 11 and the second pressing plate 21 is not limited.

[0089] In other embodiments, there is no limitation on how the manipulator 70, the first pressure plate 11 and the second pressure plate 21 are specifically arranged. The manipulator 70 only needs to be able to deliver the laminate stack 200 into the clamping gap 50, and the first pressure plate 11 and the second pressure plate 21 only need to be able to clamp or loosen the laminate stack 200.

[0090] In some embodiments, see Figure 2 and Figure 3 The adjustment mechanism 30 includes an adjustment drive member 31 and an adjustment plate 32. The adjustment drive member 31 is disposed on the mounting frame 60, and the adjustment plate 32 is connected to the adjustment drive member 31. The adjustment drive member 31 is used to drive the adjustment plate 32 to move, so as to abut against one end of the laminate stack 200 having the side diaphragm 204 to adjust the position of the laminate stack 200. In this way, the clamping claw 71 of the manipulator 70 puts the laminate stack 200 into the pressing gap 50 and is pressed by the first pressing plate 11 and the second pressing plate 21. The adjustment drive member 31 can drive the adjustment plate 32 to abut against the end surface of the laminate stack 200, and adjust the position of the laminate stack 200 in the pressing gap 50, so that the cutting position of the laminate stack 200 is opposite to the cutting mechanism 40. Optionally, the adjustment drive member 31 is a motor or a cylinder.

[0091] Further reading Figure 2 and Fig. 9The adjustment mechanism 30 further includes a third mounting plate 33, the third mounting plate 33 is connected to the adjustment drive member 31, and the adjustment plate 32 is connected to the third mounting plate 33, that is, the adjustment plate 32 is indirectly connected to the adjustment drive member 31 through the third mounting plate 33. In this way, by providing the third mounting plate 33, the position where the adjustment plate 32 is arranged can be extended to avoid interference between the adjustment plate 32 and other structures. Of course, in some other embodiments, the adjustment mechanism 30 can also omit the third mounting plate 33.

[0092] It should be noted that the adjustment mechanism 30 may also be arranged in other ways, such as arranging the adjustment mechanism 30 to include a clamping member, wherein the clamping member clamps the lamination stack 200 to adjust the position of the lamination stack 200. Any arrangement method is acceptable as long as it is possible to adjust the position of the lamination stack 200 in the clamping gap 50 without interfering with other structures.

[0093] The cutting mechanism 40 is disposed on the second mounting plate 23 and is located between the second pressing plate 21 and the adjusting plate 32. At this time, the cutting mechanism 40 moves synchronously with the second pressing plate 21. Of course, in some other embodiments, the cutting mechanism 40 may not be disposed on the second mounting plate 23, such as being directly disposed on the mounting frame 60, or being disposed independently of the mounting frame 60, which is not limited here.

[0094] In some embodiments, see Fig.10 and Fig.11 The cutting mechanism 40 includes a first longitudinal driving member 41 and a cutter 42. The first longitudinal driving member 41 is disposed on the second mounting plate 23 through the fourth mounting plate 160. The cutter 42 extends along the width direction of the bottom diaphragm 203 and is connected to the first longitudinal driving member 41. The size of the cutter 42 in the width direction of the bottom diaphragm 203 is greater than or equal to the width of the bottom diaphragm 203. The first longitudinal driving member 41 is used to drive the cutter 42 to move along the stacking direction to cut the bottom diaphragm 203. In this way, when the stack 200 is pressed and positioned by the first pressing plate 11 and the second pressing plate 21, and the cutting slit 2021 of the stack 200 is opposite to the cutter 42 in the stacking direction, the first longitudinal driving member 41 drives the cutter 42 to approach the bottom diaphragm 203 along the stacking direction, and finally extends into the cutting slit 2021 of the isolation gasket 202 to cut the bottom diaphragm 203. After cutting, the first longitudinal driving member 41 drives the cutter 42 to retract and exit the cutting slit 2021.

[0095] It should be noted that the dimension of the cutting slit 2021 in the width direction of the bottom diaphragm 203 is greater than or equal to the width of the bottom diaphragm 203, and the dimension of the cutting knife 42 in the width direction of the bottom diaphragm 203 is equal to the cutting slit 2021. Therefore, when the cutting knife 42 extends into the cutting slit 2021, the bottom diaphragm 203 can be cut off.

[0096] In some other embodiments, see Fig.12 The cutting mechanism 40 includes a second longitudinal driving member 43, a transverse driving member 44 and a cutter 42. The transverse driving member 44 is mounted on the second mounting plate 23. The second longitudinal driving member 43 is arranged on the transverse driving member 44. The cutter 42 is connected to the second longitudinal driving member 43. The second longitudinal driving member 43 is used to drive the cutter 42 to move along the stacking direction until it passes through the bottom diaphragm 203 and extends into the cutting slit 2021. The transverse driving member 44 is used to drive the cutter 42 to move along the width direction of the bottom diaphragm 203 to cut the bottom diaphragm 203. After cutting, the second longitudinal driving member 43 drives the cutter 42 to retract and exit the cutting slit 2021. In this embodiment, the cutter 42 is small in the width direction of the bottom diaphragm 203 and is a narrow knife.

[0097] It should be noted that there is no limitation on the types of the first longitudinal driving member 41 , the second longitudinal driving member 43 and the transverse driving member 44 , and they may all be motors or cylinders, for example.

[0098] In some embodiments, the cutting device 100 further includes an adsorption mechanism, which is used to adsorb and drive the bottom diaphragm 203 to separate the bottom diaphragm 203 from the bottom isolation pad 202. In this way, under the action of the adsorption mechanism, the cut bottom diaphragm 203 is easily separated from the bottom isolation pad 202, avoiding the need to set up a separate station for separating the bottom diaphragm 203.

[0099] Continue reading Figure 3 and Figure 6 The adsorption mechanism includes a third driving member 81 and a first adsorption plate 82. The third driving member 81 is arranged on the mounting frame 60. Optionally, the third driving member 81 is arranged on the first mounting plate 12, and the first adsorption plate 82 is connected to the third driving member 81. The first adsorption plate 82 and the second pressing plate 21 are located on the same side of the stack 200 in the stacking direction of the stack 200, and the first adsorption plate 82 is located on one side of the second pressing plate 21 in the width direction of the bottom diaphragm 203. The third driving member 81 is used to drive the first adsorption plate 82 to approach the stack 200 along the stacking direction to adsorb the bottom diaphragm 203 or drive the bottom diaphragm 203 away from the stack 200 to separate it from the bottom isolation gasket 202. In this arrangement, after the cutting mechanism 40 cuts off the bottom diaphragm 203, the third driving member 81 drives the first adsorption plate 82 to approach the laminate stack 200 and adhere to the bottom diaphragm 203 to adsorb the bottom diaphragm 203, and then the third driving member 81 drives the first adsorption plate 82 to drive the bottom diaphragm 203 away from the laminate stack 200, so that the bottom diaphragm 203 is separated from the bottom isolation pad 202. The third driving member 81 can be a cylinder or a motor.

[0100] It should be noted that, please continue to refer to Fig. 9 The first adsorption plate 82 is provided with adsorption holes 84 , and the first adsorption plate 82 adsorbs the bottom diaphragm 203 through the adsorption holes 84 .

[0101] For further information, see Fig.13 and Fig.14 The adsorption mechanism includes two first adsorption plates 82, and the two first adsorption plates 82 are respectively located on both sides of the second pressing plate 21 in the width direction of the bottom diaphragm 203. In this way, the two first adsorption plates 82 can adsorb the bottom diaphragm 203 from both sides of the second pressing plate 21, so that the bottom diaphragm 203 on both sides of the second pressing plate 21 are separated from the bottom isolation pad 202. The two first adsorption plates 82 can be driven by the same third driving member 81, or by two different third driving members 81.

[0102] It is understandable that in some other embodiments, the adsorption mechanism may also include only one first adsorption plate 82 , and the first adsorption plate 82 adsorbs the bottom diaphragm 203 from the side of the bottom diaphragm 203 that is not pressed by the second pressing plate 21 .

[0103] The adsorption mechanism also includes a second adsorption plate 83, which is mounted on the second mounting plate 23. The second adsorption plate 83 and the second pressing plate 21 are located on the same side of the laminate stack 200 in the stacking direction, and the second adsorption plate 83 is located on one side of the second pressing plate 21 in the width direction of the bottom diaphragm 203. In the width direction of the bottom diaphragm 203, the second adsorption plate 83 is arranged close to the second pressing plate 21 relative to the first adsorption plate 82. In this arrangement, when the first adsorption plate 82 adsorbs and drives the bottom diaphragm 203 to leave the bottom isolation gasket 202, the adsorption holes 84 of the second adsorption plate 83 generate negative pressure to adsorb the bottom diaphragm 203, ensuring that the bottom diaphragm 203 is separated from the bottom isolation gasket 202.

[0104] Furthermore, the adsorption mechanism includes two second adsorption plates 83, which are located on both sides of the second pressure plate 21 to pull the bottom diaphragm 203 from both sides of the second pressure plate 21, overcome the static electricity between the bottom diaphragm 203 and the isolation gasket 202, and separate the bottom diaphragm 203 from the bottom isolation gasket 202.

[0105] In some embodiments, see Fig.11 The cutting device 100 further includes a blowing member 90, which is used to blow air toward the bottom membrane 203 adsorbed by the adsorption mechanism, so that the portion of the bottom membrane 203 separated from the bottom isolation pad 202 is attached to the second pressing plate 21. Specifically, the blowing member 90 blows air toward the bottom membrane 203, so that the bottom membrane 203 is separated from the first adsorption plate 82 and attached to the second pressing plate 21.

[0106] Furthermore, there are two blowing members 90 , which are respectively disposed on both sides of the second pressing plate 21 to blow air toward the bottom diaphragms 203 on both sides of the second pressing plate 21 , so that the bottom diaphragms 203 on both sides fit with the second pressing plate 21 .

[0107] When the bottom membrane 203 on both sides of the second pressing plate 21 is attached to the second pressing plate 21, the third driving member 81 drives the first adsorption plate 82 to move close to the stack of laminates 200 and cooperate with the first pressing plate 11 to press the stack of laminates 200. The second driving member 22 drives the second pressing plate 21 away from the stack of laminates 200. Since the bottom membrane 203 is attached to the second pressing plate 21, it follows the movement of the second pressing plate 21 and is completely separated from the stack of laminates 200. The manipulator 70 returns to clamp the stack of laminates 200 and clamps the stack of laminates 200 with the bottom membrane 203 separated to form a pressing gap 50.

[0108] In some embodiments, see Fig. 9 The cutting device 100 further includes a first dust removal member 110, which is used to absorb the cut bottom diaphragm 203. Optionally, the first dust removal member 110 is connected to the second mounting plate 23, and a first dust removal port 1101 of the first dust removal member 110 is provided on the pressing surface of the second pressing plate 21 for pressing the bottom diaphragm 203. When the bottom diaphragm 203 is separated from the bottom isolation gasket 202, the first dust removal member 110 is activated to suck the bottom diaphragm 203 and other dust into the dust collection box through the first dust removal port 1101.

[0109] It should be understood that in some other embodiments, the position of the first dust removal port 1101 of the first dust removal member 110 is not limited, and it can also be set on the second mounting plate 23, as long as the effect of removing the bottom diaphragm 203 can be achieved.

[0110] In some embodiments, the cutting mechanism 40 is also used to cut off all the side separators 204 of the laminate stack 200. That is, after the cutting position of the laminate stack 200 is aligned with the cutting mechanism 40, the cutting mechanism 40 can not only cut off the bottom separator 203, but also cut off all the side separators 204 of the laminate stack 200. In this way, there is no need to set up a separate cutting mechanism to cut the side separators 204, which simplifies the preparation process of the battery cell 300.

[0111] In some specific embodiments, when the cutting mechanism 40 cuts the membrane, the cutter 42 extends into the cutting slit 2021 of the isolation gasket 202 of the laminate stack 200 , thereby cutting off all the side membranes 204 .

[0112] See also Fig.13 and Fig.15The cutting device 100 further includes a second dust removal member 120, which is used to absorb the cut side diaphragm 204. Optionally, the second dust removal member 120 is connected to the adjustment plate 32, and the second dust removal member 120 has a second dust removal port 1201, which is provided on the abutting surface of the adjustment plate 32 for abutting against the stack 200. Thus, when the side diaphragm 204 is cut, the second dust removal member 120 is activated to suck the side diaphragm 204 and other dust into the dust collection box through the second dust removal port 1201.

[0113] Furthermore, the cutting device 100 further includes a third dust removal member 130, the third dust removal port of the third dust removal member 130 is spaced apart from the second dust removal port 1201, and the third dust removal member 130 absorbs the side diaphragm 204 through the third dust removal port. The second dust removal member 120 and the third dust removal member 130 improve the absorption effect of diaphragm waste and other dust.

[0114] In some embodiments, see Figure 1 and Fig.16 The cutting device 100 further includes a fourth driving member 140, and the mounting frame 60 is connected to the fourth driving member 140. The fourth driving member 140 drives the mounting frame 60 to move along the stacking direction, so as to drive each structure mounted on the mounting frame 60 to move along the stacking direction. In this way, when the manipulator 70 comes from the stacking table to clamp the stack 200, the mounting frame 60 and the structure mounted on the mounting frame 60 are prevented from affecting the movement of the manipulator 70. Optionally, the fourth driving member 140 is a motor or a cylinder.

[0115] Furthermore, the cutting device 100 further includes a frame 150, and the fourth driving member 140 is mounted on the frame 150. The cutting device 100 further includes a guide mechanism, and the mounting frame 60 is connected to the frame 150 through the guide mechanism. When the fourth driving member 140 drives the mounting frame 60 to move along the stacking direction, the guide mechanism guides the mounting frame 60 to prevent the mounting frame 60 from deviating.

[0116] The cutting device 100 provided in the embodiment of the present application can cut and separate the bottom diaphragm 203 and the side diaphragm 204 using the following workflow:

[0117] Loading and stacking 200 compaction and positioning:

[0118] The fourth driving member 140 drives the mounting frame 60 to drive the structures thereon to move upward to avoid the manipulator 70, and the manipulator 70 clamps the stack of laminates 200 from the lamination table. The manipulator 70 sends the stack of laminates 200 into the clamping gap 50 between the first pressing plate 11 and the second pressing plate 21. The fourth driving member 140 drives the mounting frame 60 to move, so that the first pressing plate 11 contacts the upper surface of the stack of laminates 200, and the second driving member 22 drives the second pressing plate 21 to move close to the first pressing plate 11 to press the stack of laminates 200. The clamping claw 71 of the manipulator 70 releases the stack of laminates 200 and withdraws from between the first pressing plate 11 and the second pressing plate 21. The adjustment driving member 31 drives the adjustment plate 32 to contact one end of the stack of laminates 200 having the side diaphragm 204, and adjusts the cutting position of the stack of laminates 200 to be opposite to the cutting mechanism 40.

[0119] Cut off the diaphragm:

[0120] The cutter 42 of the cutting mechanism 40 extends into the cutting slit 2021 of the isolation gasket 202 to cut off the bottom diaphragm 203 and all the side diaphragms 204 .

[0121] Side diaphragm 204 suction:

[0122] The second dust removal component 120 is turned on, and the large and small airflows are switched. The side diaphragm 204 and the dust generated by cutting enter the second dust removal component 120 through the second dust removal port 1201 and are sucked away.

[0123] The bottom diaphragm 203 is peeled off:

[0124] The third driving member 81 drives the first adsorption plate 82 upward to approach the stack of laminations 200 and fit with the stack of laminations 200. The adsorption holes 84 of the two first adsorption plates 82 are opened by vacuum to adsorb the bottom diaphragms 203 on both sides of the second pressing plate 21. The third driving member 81 drives the first adsorption plate 82 away from the stack of laminations 200, so that the bottom diaphragms 203 on both sides leave the bottom isolation gasket 202. The two second adsorption plates 83 are opened by vacuum to provide downward adsorption force to ensure that the bottom diaphragm 203 is separated from the bottom isolation gasket 202. The two blowing members 90 blow air to separate the bottom diaphragm 203 from the first adsorption plate 82. The bottom diaphragms 203 on both sides fit with the second pressing plate 21 under the action of the airflow, and the blowing members 90 stop blowing.

[0125] Cutting:

[0126] The third driving member 81 drives the first adsorption plate 82 to approach the laminate stack 200 again and fit with the laminate stack 200. At this time, the first adsorption plate 82 cooperates with the first pressing plate 11 to press the laminate stack 200. The second driving member 22 drives the second pressing plate 21 away from the laminate stack 200, so that the second pressing plate 21 releases the pressure on the laminate stack 200. The clamping claw 71 of the manipulator 70 returns to the position where the bottom diaphragm 203 of the laminate stack 200 is peeled off. The third driving member 81 drives the first adsorption plate 82 away from the laminate stack 200, so that the first adsorption plate 82 releases the clamping of the laminate stack 200. The manipulator 70 clamps away the laminate stack 200 with the side diaphragm 204 and the bottom diaphragm 203 cut off.

[0127] Bottom membrane 203 suction removal:

[0128] The first dust removal component 110 is turned on, and the large and small airflows are switched. The bottom diaphragm 203 and the dust generated by cutting enter the first dust removal component 110 through the first dust removal port 1101 on the second pressing plate 21 and are sucked away. Furthermore, an air blowing hole can be provided on the first pressing plate 11. When the first dust removal port 1101 generates negative pressure, the air blowing hole on the first pressing plate 11 blows air toward the bottom diaphragm 203 to ensure that the bottom diaphragm 203 is smoothly sucked away by the first dust removal component 110.

[0129] See also Fig.17 Another embodiment of the present application further provides a method for preparing a battery cell, comprising the steps of:

[0130] S1: Laying a diaphragm strip in a Z shape and arranging a pole piece unit 201 in the diaphragm strip to obtain a laminate stack 200, wherein the laminate stack 200 includes at least one laminate group 200a, and the laminate group 200a includes a plurality of pole piece units 201;

[0131] The electrode unit 201 may be a single electrode, such as a positive electrode or a negative electrode. Alternatively, the electrode unit 201 may be a composite electrode unit 201, which includes a positive electrode, a negative electrode, and a diaphragm sheet sandwiched between the positive electrode and the negative electrode.

[0132] Each lamination stack 200a includes a plurality of pole piece units 201, and adjacent pole piece units 201 are separated by a Z-shaped diaphragm material strip.

[0133] S2: cutting off at least the bottom diaphragm 203 of the lamination stack 200;

[0134] In some embodiments, the bottom diaphragm 203 of the lamination stack 200 is cut away. In other embodiments, the bottom diaphragm 203 and the side diaphragms 204 of the lamination stack 200 are cut away.

[0135] S3: Pressing the laminate stack 200 along the stacking direction, each laminate group 200 a forms a battery cell 300 .

[0136] The purpose of pressing is to Fig.19 The layers in the lamination group 200a in the lamination stack 200 are pressed and compounded in the up and down directions, so as to obtain a compact battery cell 300. Optionally, the lamination stack 200 is pressed by hot pressing. During the hot pressing process, the lamination stack 200 is heated to ensure a better compounding effect between the layers of the lamination group 200a, so as to improve the reliability of the battery cell 300. After the lamination stack 200 is pressed, if the lamination stack 200 includes only one lamination group 200a, the lamination group 200a can form a battery cell 300. When the lamination stack 200 includes multiple lamination groups 200a, each lamination group 200a can be separated to prepare multiple battery cells 300.

[0137] In the above method for preparing the battery cell, the bottom diaphragm 203 of the laminate stack 200 is removed before the laminate stack 200 is pressed. When the laminate stack 200 is pressed, the bottom diaphragm 203 will not adhere to the hot pressing plate, thereby ensuring the accuracy of the hot pressing plate and being able to prepare high-quality battery cells 300.

[0138] In some embodiments, see Fig.18 and Fig.19 , S1 includes:

[0139] The diaphragm material strip is laid out in a Z shape, and a pole piece unit 201 and an isolation gasket 202 are arranged in the diaphragm material strip to obtain a laminate stack 200, an isolation gasket 202 is arranged between the lower surface of the pole piece unit 201 at the bottom of the laminate group 200a and the diaphragm material strip, and an isolation gasket 202 is arranged between the upper surface of the pole piece unit 201 at the top and the diaphragm material strip.

[0140] The pole piece units 201 in the lamination group 200a are generally stacked in the up-down direction, and the pole piece unit 201 at the bottom refers to the first pole piece unit 201 from the bottom to the top, and the pole piece unit 201 at the top refers to the last pole piece unit 201 from the bottom to the top. The surfaces of the first pole piece unit 201 and the last pole piece unit 201 facing away from each other refer to the lower surface and the upper surface, respectively. In other words, an isolation gasket 202 is provided between the lower surface of the first pole piece unit 201 from the bottom to the top of each lamination group 200a and the diaphragm material strip, and an isolation gasket 202 is also provided between the upper surface of the last pole piece unit 201 and the diaphragm material strip. The surface of the isolation gasket 202 is generally subjected to surface treatment such as coating, and will not adhere to the diaphragm material strip and the pole piece unit 201.

[0141] In one embodiment, two adjacent laminated sheet groups 200a share a common isolation pad 202. That is, the last pole piece unit 201 of one laminated sheet group 200a is provided with an isolation pad 202, and the first pole piece unit 201 of the next laminated sheet group 200a is provided on the surface of the isolation pad 202. In this way, the number of isolation pads 202 used can be reduced, which can reduce costs and simplify processes.

[0142] In other embodiments, when an isolation gasket 202 is set on the last pole piece unit 201 of the stack 200a, a diaphragm strip can be covered on the surface of the isolation gasket 202, and then another isolation gasket 202 is placed on the diaphragm strip, and finally the first pole piece unit 201 of the next stack 200a is placed on the isolation gasket 202.

[0143] Step S2 includes:

[0144] The bottom diaphragm 203 and all the side diaphragms 204 are cut off along one end of the isolation gasket 202 located in the diaphragm material strip.

[0145] It should be noted that the Z-shaped diaphragm strip has a plurality of V-shaped grooves, and the isolation gasket 202 and the pole piece unit 201 are placed in the V-shaped grooves of the diaphragm strip. The end of the isolation gasket 202 located in the diaphragm strip is the end of the isolation gasket 202 close to the bottom of the V-shaped groove. When the bottom diaphragm 203 and all the side diaphragms 204 of the laminate stack 200 are cut off along the end of the isolation gasket 202 located in the diaphragm strip, and the bottom diaphragm 203 and the side diaphragms 204 are separated from the laminate stack 200, when the laminate stack 200 is subsequently pressed, the bottom diaphragm 203 will not adhere to the hot pressing plate, thereby ensuring the accuracy of the hot pressing plate and being able to prepare high-quality battery cells 300.

[0146] S3: Pressing the laminate stack 200 along the stacking direction and removing the isolation spacer 202 to obtain at least one battery cell 300 .

[0147] After the laminate stack 200 is pressed and the isolation spacer 202 is removed, the battery cell 300 can be obtained. If the laminate stack 200 includes a plurality of laminate groups 200a, the plurality of battery cells 300 can be separated after the laminate stack 200 is pressed and the isolation spacer 202 is removed. Since the electrode unit 201 at the bottom and top of each stack group 200a is isolated from the diaphragm material strip by the isolation gasket 202, the electrode unit 201 at the bottom and top of the stack group 200a will not be compounded with the diaphragm material strip. After the isolation gasket 202 is removed, the electrode unit 201 with the bottom and top exposed will be prepared, and the obtained battery cell 300 can be a digital battery cell 300. Compared with the prior art (stacking according to the conventional lamination method to obtain a stack 200 with diaphragms on both sides of the outermost layer, and then laminating and affixing electrodes to both sides of the stack 200), when preparing the digital battery cell 300, there is no need to prepare the stack 200 and then perform electrode lamination operations, and the preparation process is simple.

[0148] Furthermore, after the isolation gasket 202 is removed, the multiple laminate groups 200a are separated from each other, and each laminate group 200a forms a battery cell 300, thereby obtaining multiple battery cells 300. It can be seen that the battery cell preparation method can prepare multiple digital battery cells 300 at one time, and there is no need to cut the diaphragm material strip once for preparing one battery cell 300. The average time required for preparing each battery cell 300 is shortened, thereby improving production efficiency.

[0149] 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.

[0150] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A cutting device, characterized in that: include: A first pressing mechanism (10) comprising a first pressing plate (11); A second pressing mechanism (20) comprises a second pressing plate (21); a pressing gap (50) for placing the lamination stack (200) is formed between the first pressing plate (11) and the second pressing plate (21); the first pressing plate (11) and the second pressing plate (21) can move closer to or farther from each other in the stacking direction of the lamination stack (200) to press or loosen the lamination stack (200); An adjusting mechanism (30) and a cutting mechanism (40), wherein the adjusting mechanism (30) is used to adjust the position of the lamination stack (200) located in the pressing gap (50), and the cutting mechanism (40) is used to cut off at least the bottom diaphragm (203) of the pressed lamination stack (200).

2. The cutting device according to claim 1, characterized in that: The first pressing mechanism (10) further comprises a first driving member, the first pressing plate (11) is connected to the first driving member, and the first driving member is used to drive the first pressing plate (11) to move along the stacking direction; and / or The second pressing mechanism (20) further comprises a second driving member (22), the second pressing plate (21) being connected to the second driving member (22), and the second driving member (22) being used for driving the second pressing plate (21) to move along the stacking direction.

3. The cutting device according to claim 1, characterized in that: The cutting device comprises a robot (70), the robot (70) being used to clamp the end of the lamination stack (200) away from the side diaphragm (204), and to feed the lamination stack (200) into the pressing gap (50); The adjustment mechanism (30) can abut against an end surface of the lamination stack (200) having a side diaphragm (204) to adjust the position of the lamination stack (200) in the compression gap (50).

4. The cutting device according to claim 3, characterized in that: The adjustment mechanism (30) comprises an adjustment plate (32) and an adjustment driving member (31) which are connected to each other; The adjustment drive member (31) is used to drive the adjustment plate (32) to move so as to abut against one end of the lamination stack (200) having a side diaphragm (204) to adjust the position of the lamination stack (200).

5. The cutting device according to claim 3, characterized in that: The manipulator (70) comprises at least two groups of clamping jaws (71) arranged along the width direction of the bottom diaphragm (203), and there is a receiving gap (72) between two adjacent groups of the clamping jaws (71), and the first pressing plate (11) and the second pressing plate (21) can extend into the receiving gap (72) to press the stack of laminations (200).

6. The cutting device according to claim 1, characterized in that: The cutting mechanism (40) comprises a cutter (42) and a first longitudinal driving member (41) which are connected to each other, wherein the cutter (42) extends along the width direction of the bottom diaphragm (203), and the first longitudinal driving member (41) is used to drive the cutter (42) to move along the stacking direction to cut off the bottom diaphragm (203); or The cutting mechanism (40) includes a second longitudinal driving member (43), a transverse driving member (44) and a cutter (42), wherein the second longitudinal driving member (43) is used to drive the cutter (42) to move along the stacking direction until it passes through the bottom diaphragm (203), and the transverse driving member (44) is used to drive the cutter (42) to move along the width direction of the bottom diaphragm (203) to cut off the bottom diaphragm (203).

7. The cutting device according to claim 1, characterized in that: The cutting device further comprises an adsorption mechanism, which is used to adsorb and drive the bottom diaphragm (203) to separate it from the bottom isolation pad (202).

8. The cutting device according to claim 7, characterized in that: The second pressing plate (21) is pressed against the bottom diaphragm (203); The adsorption mechanism comprises a third driving member (81) and a first adsorption plate (82) which are connected to each other, the first adsorption plate (82) and the second pressing plate (21) are located on the same side of the lamination stack (200) in the stacking direction, and the first adsorption plate (82) is located on one side of the second pressing plate (21) in the width direction of the bottom diaphragm (203); The third driving member (81) is used to drive the first adsorption plate (82) to approach the lamination stack (200) along the stacking direction to adsorb the bottom diaphragm (203) or to drive the bottom diaphragm (203) away from the lamination stack (200) to separate it from the bottom isolation gasket (202).

9. The cutting device according to claim 8, characterized in that: The adsorption mechanism further comprises a second adsorption plate (83), wherein the second adsorption plate (83) and the second pressing plate (21) are located on the same side of the laminate stack (200) in the stacking direction, and the second adsorption plate (83) is located on one side of the second pressing plate (21) in the width direction of the bottom diaphragm (203); In the width direction of the bottom diaphragm (203), the second adsorption plate (83) is arranged close to the second pressing plate (21) relative to the first adsorption plate (82).

10. The cutting device according to claim 7, characterized in that: The cutting device further comprises a blowing member (90), wherein the blowing member (90) is used to blow air toward the bottom diaphragm (203) adsorbed by the adsorption mechanism, so that the portion of the bottom diaphragm (203) separated from the bottom isolation gasket (202) is in contact with the second pressing plate (21).

11. The cutting device according to claim 1, characterized in that: The cutting device further comprises a first dust removing member (110), wherein the first dust removing member (110) is used for sucking the cut bottom layer membrane (203).

12. The cutting device according to claim 11, characterized in that: The second pressing plate (21) is pressed against the bottom diaphragm (203); The first dust removal member (110) has a first dust removal port (1101), and the first dust removal port (1101) is arranged on the pressing surface of the second pressing plate (21) for pressing the lamination stack (200).

13. The cutting device according to claim 1, characterized in that: The cutting mechanism (40) is also used to cut off all side membranes (204) of the laminate stack (200).

14. The cutting device according to claim 13, characterized in that: The cutting device further comprises a second dust removing member (120), wherein the second dust removing member (120) is used for sucking the cut side diaphragm (204).

15. The cutting device according to claim 14, characterized in that: The adjustment mechanism (30) comprises an adjustment plate (32) and an adjustment drive member (31) connected to each other; the adjustment drive member (31) is used to drive the adjustment plate (32) to move so as to abut against one end of the lamination stack (200) having the side diaphragm (204) to adjust the position of the lamination stack (200); The second dust removal member (120) has a second dust removal port (1201), and the second dust removal port (1201) is arranged on the abutting surface of the adjustment plate (32) for abutting against the lamination stack (200).

16. The cutting device according to any one of claims 1 to 15, characterized in that: The cutting device further comprises a fourth driving member (140) and a mounting frame (60), wherein the mounting frame (60) is connected to the fourth driving member (140), and the first pressing mechanism (10), the second pressing mechanism (20), the cutting mechanism (40) and the adjusting mechanism (30) are all arranged on the mounting frame (60); The fourth driving member (140) is used to drive the mounting frame (60) to move along the stacking direction, so as to drive the first pressing mechanism (10), the second pressing mechanism (20), the cutting mechanism (40) and the adjusting mechanism (30) to move synchronously along the stacking direction.

17. A method for preparing a battery cell, characterized in that: Includes steps: S1: laying a diaphragm material strip in a Z shape, and arranging a pole piece unit (201) in the diaphragm material strip to obtain a lamination stack (200), wherein the lamination stack (200) comprises at least one lamination group (200a), and the lamination group (200a) comprises a plurality of pole piece units (201); S2: cutting off at least the bottom diaphragm (203) of the lamination stack (200); S3: Pressing the laminate stack (200) along a stacking direction, so that each laminate group (200a) forms a battery core (300).

18. The method for preparing a battery cell according to claim 17, characterized in that: The step S1 comprises: The diaphragm material strip is laid in a Z shape, and the pole piece unit (201) and the isolation gasket (202) are arranged in the diaphragm material strip to obtain the laminate stack (200), wherein the isolation gasket (202) is arranged between the lower surface of the pole piece unit (201) at the bottom of the laminate group (200a) and the diaphragm material strip, and the isolation gasket (202) is arranged between the upper surface of the pole piece unit (201) at the top and the diaphragm material strip; The step S2 comprises: Cutting off the bottom diaphragm (203) and all side diaphragms (204) along one end of the isolation gasket (202) located in the diaphragm material strip; The step S3 comprises: The laminate stack (200) is pressed along a stacking direction and the isolation gasket (202) is removed to obtain at least one battery cell (300).

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