Lamination equipment, method and lamination structure

Abstract

The present invention discloses a lamination device, method and lamination structure, which relate to the technical field of battery cell manufacturing. The lamination device includes a conveying mechanism and a bearing mechanism. The conveying mechanism is used to convey a composite electrode sheet strip downward, wherein the composite electrode sheet strip has a plurality of composite electrode sheet units arranged in sequence and spaced apart, and two adjacent composite electrode sheet units are connected by a bendable bending section, wherein the composite electrode sheet unit includes a diaphragm strip, a first electrode sheet, another diaphragm strip and a second electrode sheet arranged in sequence and overlapping. The bearing mechanism has a stacking plane, and the stacking plane is used to receive the composite electrode sheet unit so that the plurality of composite electrode sheet units are stacked up one by one on the stacking plane to form a lamination structure, and the first electrode sheet in any composite electrode sheet unit in the lamination structure is adjacent to the second electrode sheet in another adjacent composite electrode sheet unit. The lamination device, method and lamination structure all have the characteristics of high lamination efficiency and good lamination quality.

Description

Technical Field

[0001] The present invention relates to the technical field of battery core manufacturing, and in particular to a lamination device, method and lamination structure. Background Art

[0002] At present, lithium-ion battery cells mainly have two structures: winding and stacking. Among them, the stacking structure is to stack the sheet-shaped positive electrode sheet, negative electrode sheet and separator in sequence into a semi-finished battery, but the efficiency of the existing stacking process is low.

[0003] In view of this, it is particularly important to develop and design a lamination device, method and lamination structure that can solve the above-mentioned technical problems. Summary of the invention

[0004] The object of the present invention is to provide a lamination device, which has the characteristics of high lamination efficiency and good lamination quality.

[0005] Another object of the present invention is to provide a lamination method, which also has the characteristics of high lamination efficiency and good lamination quality.

[0006] Another object of the present invention is to provide a lamination structure which also has the characteristics of high lamination efficiency and good lamination quality.

[0007] The present invention provides a technical solution:

[0008] In the first aspect, an embodiment of the present invention provides a lamination device, which includes a conveying mechanism and a carrying mechanism; the conveying mechanism is used to convey a composite electrode sheet strip downward, wherein the composite electrode sheet strip has a plurality of composite electrode sheet units arranged in sequence and spaced apart, and two adjacent composite electrode sheet units are connected by a bendable bending section, and the composite electrode sheet unit includes a diaphragm strip, a first electrode sheet, another diaphragm strip and a second electrode sheet arranged in sequence and overlapping each other; the carrying mechanism has a stacking plane, and the stacking plane is used to receive the composite electrode sheet unit so that a plurality of the composite electrode sheet units are stacked up one by one on the stacking plane to form a lamination structure, and the first electrode sheet in any one of the composite electrode sheet units in the lamination structure is adjacent to the second electrode sheet in another adjacent composite electrode sheet unit.

[0009] In combination with the first aspect, in a first implementation of the first aspect, the conveying mechanism is two adjacent conveying rollers, and the two conveying rollers are used together to convey the composite electrode unit to the stacking plane along the first direction; the distance H between the position where the conveying roller contacts the composite electrode unit and the stacking plane is greater than or equal to Wherein, W is the distance between the two sides of the composite pole piece unit in the extension direction of the composite pole piece band.

[0010] In combination with the first aspect and the above-mentioned implementation manner, in a second implementation manner of the first aspect, the conveying mechanism is two adjacently arranged conveying rollers, and the two conveying rollers are used together to convey the composite electrode unit along the first direction; the composite electrode unit is flexible, and the distance H between the position where the conveying roller contacts the composite electrode unit and the stacking plane is greater than or equal to Wherein, W is the distance between the two sides of the composite pole piece unit in the extension direction of the composite pole piece band.

[0011] In combination with the first aspect and the above-mentioned implementation manner, in a third implementation manner of the first aspect, the direction in which the conveying mechanism conveys the composite electrode strip is a first direction, and the first direction is perpendicular to the stacking plane and points to the center of the stacking plane.

[0012] In combination with the first aspect and its above-mentioned implementation manner, in a fourth implementation manner of the first aspect, the stacking equipment also includes a mobile driving member, which is connected to the supporting mechanism; the mobile driving member can drive the supporting mechanism to move downward to keep the distance between the composite pole piece unit located at the top of the stacking structure on the stacking plane and the conveying mechanism unchanged.

[0013] In combination with the first aspect and the above-mentioned implementation manner, in a fifth implementation manner of the first aspect, the stacking device also includes a guide member, which is arranged above the stacking plane; the guide member is located between the conveying mechanism and the stacking plane.

[0014] In combination with the first aspect and the above-mentioned implementation manner, in a sixth implementation manner of the first aspect, the stacking device also includes an adsorption component, which is arranged on the stacking plane and is used to adsorb the composite pole piece unit downward.

[0015] In combination with the first aspect and the above-mentioned implementation manner, in a seventh implementation manner of the first aspect, a rib is provided on the stacking plane, and the rib is arranged at an edge of the stacking plane.

[0016] In the second aspect, an embodiment of the present invention further provides a lamination method, which is applied to the lamination equipment, and the lamination method includes: conveying the composite pole piece belt downward to the stacking plane so that a plurality of the composite pole piece units are stacked up one by one on the stacking plane to form a lamination structure.

[0017] In combination with the second aspect, in a first implementation of the second aspect, the stacking method further includes: moving the stacking plane downward to keep the distance between the composite pole piece unit located at the top of the stacking structure on the stacking plane and the conveying mechanism unchanged.

[0018] In the third aspect, an embodiment of the present invention further provides a stacking structure, which is applied to the stacking device, the stacking structure includes the composite pole piece strip, the composite pole piece strip includes two diaphragm strips, multiple first pole pieces and multiple second pole pieces; the multiple first pole pieces are arranged between the two diaphragm strips, and are arranged at intervals along the extension direction of the diaphragm strips; the multiple second pole pieces are staggered on the side of the two diaphragm strips away from the first pole piece, and the multiple second pole pieces correspond one-to-one to the multiple first pole pieces, so that the first pole piece and the corresponding second pole piece form the composite pole piece unit, and there is a gap between adjacent composite pole piece units, and a section of the diaphragm strip corresponding to the gap is a bending section, and the bending section can be bent for bending when the multiple composite pole piece units are folded one by one.

[0019] In combination with the third aspect and the above implementation manner, in a second implementation manner of the third aspect, the range of the length δ1 of the bending segment is:

[0020]

[0021] Among them, W1 is the width of the first pole piece, W2 is the width of the second pole piece, Ta is the thickness of the first pole piece, Tc is the thickness of the second pole piece, and Ts is the thickness of the diaphragm strip, wherein the width refers to the distance between the first pole piece and the second pole piece on both sides in the corresponding extension direction of the diaphragm strip.

[0022] Compared with the prior art, the lamination device provided by the embodiment of the present invention has the following beneficial effects over the prior art:

[0023] The lamination equipment includes a conveying mechanism and a bearing mechanism, wherein the conveying mechanism is used to convey a composite electrode strip downward, the composite electrode strip having a plurality of composite electrode units arranged sequentially and spaced apart, and two adjacent composite electrode units are connected by a bendable bending section. The bearing mechanism has a stacking plane, the stacking plane is used to receive the composite electrode units, so that the composite electrode strip is folded on the stacking plane, so that the plurality of composite electrode units are stacked one by one on the stacking plane to form a lamination structure. The composite electrode sheet belt is conveyed to the stacking plane by a conveying mechanism, so that the composite electrode sheet unit on the composite electrode sheet belt is close to the stacking plane, and another composite electrode sheet unit on the composite electrode sheet belt is folded toward the composite electrode sheet unit on the stacking plane and close to the composite electrode sheet unit on the stacking plane, so as to stack a laminate structure of two composite electrode sheet units, and another composite electrode sheet unit connected to the composite electrode sheet unit at the top of the laminate structure through a bending section is also folded toward the composite electrode sheet unit located at the top of the laminate structure, so as to stack a plurality of composite electrode sheet units in succession, complete the lamination operation, and form a laminate structure with a plurality of composite electrode sheet units. In addition, since the composite electrode sheet unit includes a diaphragm belt, a first electrode sheet, another diaphragm belt and a second electrode sheet which are arranged in sequence and overlapped, and the two second electrode sheets in two adjacent composite electrode sheet units are respectively located on both sides of their respective first electrode sheets, the first electrode sheet in any composite electrode sheet unit in the laminate structure is adjacent to the second electrode sheet in another adjacent composite electrode sheet unit. The lamination operation utilizes the bending sections between adjacent composite pole piece units, and multiple composite pole piece units are folded one by one under the action of their own gravity and the drive of the conveying mechanism. The lamination operation is highly efficient, and is not prone to deformation of the composite pole piece units, and the lamination quality is high.

[0024] The beneficial effects of the lamination method and lamination structure provided by the embodiments of the present invention relative to the prior art are the same as the beneficial effects of the above-mentioned lamination equipment relative to the prior art, which will not be described in detail here.

[0025] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can also be obtained based on these drawings without creative work.

[0027] Figure 1 A schematic structural diagram of the lamination equipment provided in the first embodiment of the present invention when starting the lamination operation.

[0028] Figure 2 A schematic structural diagram of the lamination equipment provided in the first embodiment of the present invention during the lamination operation.

[0029] Figure 3 A schematic structural diagram of the lamination device provided in the first embodiment of the present invention when performing a lamination operation in a state where the distance between the conveying mechanism and the supporting mechanism is relatively close.

[0030] Figure 4 A schematic flow chart of a lamination method provided for the second embodiment of the present invention.

[0031] Figure 5 A schematic structural diagram of a lamination structure provided in the third embodiment of the present invention.

[0032] Figure 6 A schematic structural diagram of a composite pole piece strip of a laminated structure provided in the third embodiment of the present invention.

[0033] Figure 7 for Figure 6 Schematic diagram of the enlarged structure at position VII.

[0034] Figure 8 A schematic diagram of a portion of the structure of two adjacent composite pole piece units in a laminate structure provided in a third embodiment of the present invention under an extreme misalignment state.

[0035] Fig. 9 A schematic diagram of a portion of the structure of the laminated structure provided in the third embodiment of the present invention in which two adjacent composite pole piece units are aligned.

[0036] Icons: 20-laminate structure; 22-composite pole piece strip; 221-composite pole piece unit; 222-diaphragm strip; 226-first pole piece; 227-second pole piece; 228-bending section; 10-laminate equipment; 11-conveyor mechanism; 12-carrying mechanism; 121-stacking plane; 122-guard edge; 13-moving drive member; 14-guide member; A-first direction; R-right swing center; L-left swing center; C-laminate center. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0038] It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. The orientation or position relationship indicated by the terms "upper", "lower", "inner", "outer", "left", "right", etc. is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship usually placed when the invention product is used, or the orientation or position relationship commonly understood by those skilled in the art. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. The terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. The terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such a process, method, article or device. Without more constraints, an element defined by the phrase "comprising a..." does not exclude the existence of other identical elements in the process, method, article or apparatus comprising the element.

[0039] It should also be noted that, unless otherwise clearly specified and limited, the terms "disposed", "connected" and the like should be understood in a broad sense. For example, "connected" 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, or it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings.

[0041] First embodiment:

[0042] See also Figure 1 , Figure 2 and Figure 3 , Figure 1 This is a schematic structural diagram of the lamination device 10 provided in the first embodiment of the present invention when starting the lamination operation. Figure 2 The schematic diagram of the structure of the lamination device 10 provided in the first embodiment of the present invention during the lamination operation, wherein the direction indicated by the arrow A is the first direction A, the arrow R indicates the right swing center R, the arrow L indicates the left swing center L, and C is the lamination center C.

[0043] The first embodiment of the present invention provides a lamination device 10, which is used to fold a composite electrode strip 22, and has the characteristics of high lamination efficiency and good lamination quality. The lamination device 10 can be applied to scenes such as lamination systems and battery cell production lines. Of course, the lamination mechanism can also be used independently.

[0044] The structural composition, working principle and beneficial effects of the lamination device 10 provided in the first embodiment of the present invention will be specifically introduced below.

[0045] Please continue reading Figure 1 and Figure 2 The lamination device 10 includes a conveying mechanism 11 and a carrying mechanism 12, wherein the conveying mechanism 11 is used to convey the composite electrode strip 22 downward, and the composite electrode strip 22 has a plurality of composite electrode units 221 arranged in sequence and spaced apart, and two adjacent composite electrode units 221 are connected by a bendable bending section 228. In other words, the composite electrode strip 22 is formed by a plurality of composite electrode units 221 and a plurality of bending sections 228 being staggered and connected in sequence.

[0046] The supporting mechanism 12 has a stacking plane 121 for receiving the composite pole piece unit 221 , so that the composite pole piece belt 22 is folded on the stacking plane 121 , and a plurality of composite pole piece units 221 are stacked one by one on the stacking plane 121 to form a laminate structure 20 . In other words, the composite pole piece strip 22 is conveyed to the stacking plane 121 by the conveying mechanism 11, so that the composite pole piece unit 221 on the composite pole piece strip 22 is abutted against the stacking plane 121, and another composite pole piece unit 221 thereon is folded toward the composite pole piece unit 221 on the stacking plane 121 and abutted against the composite pole piece unit 221 on the stacking plane 121, so as to stack a stacked structure 20 of two composite pole piece units 221, and another composite pole piece unit 221 connected to the composite pole piece unit 221 at the top of the stacking structure 20 through the bending section 228 is also folded toward the composite pole piece unit 221 located at the top of the stacking structure 20, thereby stacking a plurality of composite pole piece units 221 one by one, completing the stacking operation, and forming a stacking structure 20 with multiple composite pole piece units 221. Furthermore, since the composite electrode unit 221 includes a diaphragm belt 222, a first electrode 226, another diaphragm belt 222, and a second electrode 227 which are sequentially overlapped, and the two second electrode pieces 227 in two adjacent composite electrode units 221 are respectively located on both sides of their respective first electrode pieces 226, the first electrode piece 226 in any composite electrode unit 221 in the laminated structure 20 is adjacent to the second electrode piece 227 in another adjacent composite electrode unit 221. The lamination operation utilizes the bending section 228 between adjacent composite electrode units 221 to be bendable, and the multiple composite electrode units 221 are folded one by one under the action of their own gravity and the drive of the conveying mechanism 11, so the lamination operation is highly efficient, and it is not easy to cause deformation of the composite electrode unit 221, and the lamination quality is high.

[0047] by Figure 2 For example, the composite electrode strip 22 is driven by the conveying mechanism 11 to convey the electrode unit downward along the first direction A. The composite electrode unit 221 on the conveying mechanism 11 is similar to the moving slider in the offset slider mechanism, and slides along the first direction A. There are multiple composite electrode units 221 between the conveying mechanism 11 and the stacking plane 121, which are similar to multiple swing rods. Each composite electrode unit 221 is in contact with the stacking plane 121 or the top of the laminated structure 20, and the rotation center of the swing rod is similar to that of the swing rod. Figure 2 As shown, L is Figure 2 The left swing center L and R of the composite pole piece unit 221 after folding the top of the middle lamination structure 20 are Figure 2 The right swing center R of the composite pole piece unit 221 which is located at the top of the laminate structure 20 and is swinging backward, in other words, in the process of the composite pole piece unit 221 folding toward the stacking plane 121, part of the composite pole piece unit 221 is folded toward the stacking plane 121. Figure 2The left side of the composite pole piece 221 is folded toward the stacking plane 121 and folded around the left swing center L. Figure 2 The right side is folded toward the stacking plane 121, and folded around the right swing center R, and folded around the left swing center L and the right swing center R alternately. In addition, the composite pole piece belt 22 moves downward under the drive of the conveying mechanism 11, and the plurality of composite pole piece units 221 swing alternately around the left swing center L and the right swing center R one by one under the action of the conveying mechanism 11 and their own gravity, so as to be stacked one by one to form a stacking structure 20. The stacking operation process is not easy to cause deformation of the composite pole piece unit 221, and the stacking quality is relatively high.

[0048] In the existing partial lamination operation mode, the diaphragm moves back and forth at high speed, and the positive electrode sheet / negative electrode sheet is stacked after each movement. This lamination operation mode is easy to form wrinkles between the electrode sheet and the diaphragm, which leads to lithium precipitation after the battery cell is charged and discharged. In addition, due to the high-speed reciprocation of the diaphragm, this lamination operation mode is easy to cause a large change in the diaphragm tension. Due to the different friction, inertia and motor drive performance of different machines, it is easy to cause inconsistent deformation of the diaphragm, and the irreversible deformation of the diaphragm stretching and the tensile deformation of the diaphragm micropores will occur, affecting the performance of the battery cell. The lamination device 10 provided in this embodiment uses the gravity of the conveying mechanism 11 and the composite electrode sheet unit 221 itself to make multiple composite electrode sheet units 221 alternately swing with the left swing center L and the right swing center R, so as to stack and form a lamination structure 20. Its lamination operation process is not easy to cause deformation of the composite electrode sheet unit 221, and its lamination quality is high. By adjusting the conveying speed of the conveying mechanism 11, the stacking speed can also be increased to achieve the effect of high-speed lamination.

[0049] Furthermore, the first direction A is perpendicular to the stacking plane 121 and points to the center of the stacking plane 121. In this way, during the alternating swinging of the plurality of composite pole piece units 221 around the left swing center L and the right swing center R, the movement amplitudes of the composite pole piece units 221 swinging in two directions are symmetrical about the straight line where the first direction A is located. In other words, the distances from the left swing center L and the right swing center R to the stacking center C are both half of the width of the composite pole piece unit 221, thereby improving the symmetry of the stacking structure 20 and further improving the stacking quality of the stacking device 10.

[0050] Furthermore, the conveying mechanism 11 is two adjacent conveying rollers, which are used to convey the composite electrode unit 221 along the first direction A, and the distance H between the position where the conveying roller contacts the composite electrode unit 221 and the stacking plane 121 can be greater than or equal to Wherein, W is the distance between two sides of the composite pole piece unit 221 in the extension direction of the composite pole piece belt 22 , and the length of the composite pole piece unit 221 .

[0051] In this way, there are at least two composite electrode units 221 between the conveying mechanism 11 and the stacking plane 121, so that the two composite electrode units 221 between the conveying mechanism 11 and the stacking plane 121 are bent toward the stacking center C or the stacking plane 121, that is, the bending section 228 between the two composite electrode units 221 is bent toward the stacking center C or the stacking plane 121, as shown in FIG. Figure 1 and Figure 2 As shown, the bending section 228 between the two composite pole piece units 221 is reduced to deviate from the stacking center C or deviate toward the stacking plane 121 while bending, so as to improve the working stability of the stacking device 10.

[0052] See also Figure 2 and Figure 3 , Figure 3 The schematic structural diagram of the lamination device 10 provided in the first embodiment of the present invention is a schematic structural diagram of the lamination operation performed when the distance between the conveying mechanism 11 and the supporting mechanism 12 is relatively close.

[0053] The composite electrode unit 221 may be flexible, and the distance between the position where the conveying roller contacts the composite electrode unit 221 and the stacking plane 121 may be H greater than or equal to like Figure 3 shown.

[0054] In this way, when the conveying mechanism 11 conveys the composite electrode unit 221 to the stacking plane 121, the composite electrode unit 221 between the two conveying rollers and the composite electrode unit 221 folded toward the stacking plane 121 will be bent, so that multiple composite electrode units 221 can be gradually stacked on the stacking plane 121 to complete the stacking operation.

[0055] It should be noted that, in other embodiments, the bearing mechanism 12 or the conveying mechanism 11 may also be a mechanism capable of moving in a direction perpendicular to the first direction A. When performing the lamination operation, the bearing mechanism 12 or the conveying mechanism 11 moves in a direction perpendicular to the first direction A to reduce the degree of bending of the composite electrode unit 221 and improve the lamination quality. Of course, the composite electrode unit 221 at the first turning stacking plane 121 can be moved in a direction perpendicular to the first direction A by the bearing mechanism 12 or the conveying mechanism 11, so that the midpoint of the composite electrode unit 221 at the first turning stacking plane 121 coincides with the lamination center C.

[0056] Furthermore, the stacking device 10 may also include a movable driving member 13, which is connected to the supporting mechanism 12, and the movable driving member 13 can drive the supporting mechanism 12 to move along the first direction A to keep the distance between the composite pole piece unit 221 located at the top of the stacking structure 20 on the stacking plane 121 and the conveying mechanism 11 unchanged. In this way, in the process of stacking the composite pole piece units 221, the distance between the top of the stacking structure 20 and the conveying mechanism 11 remains unchanged, and the number of composite pole piece units 221 between the top of the stacking structure 20 and the conveying mechanism 11 remains unchanged, so that the upper composite pole piece unit 221 has the same effect on each composite pole piece unit 221 folded toward the stacking plane 121, so as to further maintain the stability of the stacking operation and improve the quality of the stacking structure 20.

[0057] Furthermore, the lamination device 10 may further include a guide member 14, which is disposed above the stacking plane 121 and between the conveying mechanism 11 and the stacking plane 121, so that when the composite electrode strip 22 is bent away from the straight line where the first direction A is located, Figure 1 As shown, the guide member 14 can be used to limit the bending of the composite pole piece strip 22 away from the straight line where the first direction A is located. For example, during the lamination operation, if the bending section 228 between the composite pole piece units 221 has poor flexibility and the adjacent composite pole piece units 221 are difficult to bend relative to each other, the guide member 14 can assist the adjacent composite pole piece units 221 to bend.

[0058] It should be noted that the guide member 14 can also be a mechanism that can move toward the composite electrode strip 22 located between the conveying mechanism 11 and the stacking plane 121, so as to drive the corresponding composite electrode strip 22 to move linearly toward the first direction A, and assist in bending the composite electrode strip 22.

[0059] Furthermore, the stacking plane 121 may be provided with a retaining edge 122, which is arranged at the edge of the stacking plane 121 to limit the lateral movement of the composite pole piece unit 221 on the stacking plane 121, especially when H is greater than And H is less than hour.

[0060] It should be noted that, in other embodiments, the stacking device 10 may also include an adsorption component, which can be arranged on the stacking plane 121 and is used to adsorb the composite pole piece unit 221 to the stacking plane 121 along the first direction A to further limit the lateral movement of the composite pole piece unit 221 on the stacking plane 121.

[0061] The working principle of the lamination device 10 provided in the first embodiment of the present invention is:

[0062] The lamination device 10 includes a conveying mechanism 11 and a carrying mechanism 12, wherein the conveying mechanism 11 is used to convey downward a composite electrode strip 22, on which a plurality of composite electrode units 221 are sequentially arranged at intervals, and two adjacent composite electrode units 221 are connected by a bendable bending section 228. The carrying mechanism 12 has a stacking plane 121, which is used to receive the composite electrode units 221, so that the composite electrode strip 22 is folded on the stacking plane 121, so that the plurality of composite electrode units 221 are stacked one by one on the stacking plane 121 to form a lamination structure 20. The composite pole piece belt 22 is conveyed to the stacking plane 121 through the conveying mechanism 11, so that the composite pole piece unit 221 on the composite pole piece belt 22 is abutted against the stacking plane 121, and another composite pole piece unit 221 thereon is folded toward the composite pole piece unit 221 on the stacking plane 121 and abutted against the composite pole piece unit 221 on the stacking plane 121, so as to stack a stacking structure 20 of two composite pole piece units 221, and another composite pole piece unit 221 connected to the composite pole piece unit 221 at the top of the stacking structure 20 through the bending section 228 is also folded toward the composite pole piece unit 221 located at the top of the stacking structure 20, thereby stacking a plurality of composite pole piece units 221 one by one, completing the stacking operation, and forming a stacking structure 20 with a plurality of composite pole piece units 221. Furthermore, since the composite electrode unit 221 includes a diaphragm belt 222, a first electrode 226, another diaphragm belt 222, and a second electrode 227 which are sequentially overlapped, and the two second electrode pieces 227 in two adjacent composite electrode units 221 are respectively located on both sides of their respective first electrode pieces 226, the first electrode piece 226 in any composite electrode unit 221 in the laminated structure 20 is adjacent to the second electrode piece 227 in another adjacent composite electrode unit 221. The lamination operation utilizes the bending section 228 between adjacent composite electrode units 221 to be bendable, and the multiple composite electrode units 221 are folded one by one under the action of their own gravity and the drive of the conveying mechanism 11, so the lamination operation is highly efficient, and it is not easy to cause deformation of the composite electrode unit 221, and the lamination quality is high.

[0063] In summary:

[0064] The first embodiment of the present invention provides a lamination device 10, which has the characteristics of high lamination efficiency and good lamination quality.

[0065] Second embodiment:

[0066] See also Figure 4 , Figure 4 A schematic flow chart of a lamination method provided for the second embodiment of the present invention.

[0067] The second embodiment of the present invention provides a lamination method, which is applied to the lamination device 10 in the above embodiment. The lamination method also has the characteristics of high lamination efficiency and good lamination quality.

[0068] It should be noted that the basic principle and technical effects of the lamination method provided in this embodiment are the same as those of the above embodiments. For the sake of brief description, for parts not mentioned in this embodiment, reference may be made to the corresponding contents in the above embodiments.

[0069] The lamination method includes:

[0070] Step S100 : conveying the composite pole piece tape 22 downward to the stacking plane 121 , so that a plurality of composite pole piece units 221 are stacked one by one on the stacking plane 121 , thereby forming a stacking structure 20 .

[0071] In this way, the composite pole sheet unit 221 on the composite pole sheet belt 22 is abutted against the stacking plane 121, and another composite pole sheet unit 221 on the composite pole sheet unit 221 continues to fold toward the composite pole sheet unit 221 on the stacking plane 121 and abuts against the composite pole sheet unit 221 on the stacking plane 121 to stack a laminated structure 20 of two composite pole sheet units 221, and another composite pole sheet unit 221 connected to the composite pole sheet unit 221 at the top of the laminated structure 20 through the bending section 228 is also folded toward the composite pole sheet unit 221 located at the top of the laminated structure 20, thereby stacking multiple composite pole sheet units 221 one by one to complete the stacking operation and form a laminated structure 20 with multiple composite pole sheet units 221. The bending sections 228 between adjacent composite pole piece units 221 are bendable, and the driving action of the conveying mechanism 11 and the gravity of the composite pole piece units 221 themselves are utilized to fold a plurality of composite pole piece units 221 one by one, and the stacking operation is highly efficient.

[0072] Furthermore, the lamination method may also include:

[0073] Step S200: Move the stacking plane 121 downward to keep the distance between the composite electrode unit 221 located on the top of the stacking structure 20 on the stacking plane 121 and the conveying mechanism 11 unchanged.

[0074] Thereby, the distance between the composite pole piece unit 221 located at the top of the stacking plane 121 and the conveying mechanism 11 is kept unchanged, so that the number of composite pole piece units 221 between the top of the stacking structure 20 and the conveying mechanism 11 remains unchanged. In this way, the composite pole piece unit 221 located above the stacking structure 20 has the same influence on the process of each composite pole piece unit 221 folding toward the stacking plane 121, thereby improving the stability of the stacking operation and improving the quality of the stacking structure 20.

[0075] It should be noted that the direction of conveying the composite pole piece belt to the stacking plane 121 is the first direction A, and the first direction A may be perpendicular to the stacking plane 121 and point to the center of the stacking plane 121. Therefore, in the process of the multiple composite pole piece units 221 swinging alternately around the left swing center L and the right swing center R, the action amplitude of the composite pole piece units 221 swinging to the left and to the right is the same, that is, the distances from the left swing center L and the right swing center R to the stacking center C are both half of the width of the composite pole piece unit 221, thereby improving the precise relative position of the multiple composite pole piece units 221 on the stacking structure 20, and further improving the stacking quality of the stacking device 10.

[0076] In summary:

[0077] The second embodiment of the present invention provides a lamination method, which also has the characteristics of high lamination efficiency and good lamination quality.

[0078] Third embodiment:

[0079] See also Figure 5 , Figure 6 and Figure 7 , Figure 5 A schematic structural diagram of a lamination structure 20 provided in a third embodiment of the present invention. Figure 6 A schematic structural diagram of a composite pole piece strip 22 of a laminate structure 20 provided in a third embodiment of the present invention. Figure 7 for Figure 6 Schematic diagram of the enlarged structure at position VII.

[0080] The third embodiment of the present invention provides a lamination structure 20, which can be manufactured using the lamination equipment 10 or the lamination method in the above embodiment. It has a high efficiency in lamination operation and also has the characteristic of high lamination operation efficiency.

[0081] It should be noted that the basic principle and technical effects of the lamination structure 20 provided in this embodiment are the same as those of the above embodiments. For the sake of brief description, for parts not mentioned in this embodiment, reference may be made to the corresponding contents in the above embodiments.

[0082] The laminated structure 20 includes a composite pole piece strip 22, which may include two diaphragm strips 222, multiple first pole pieces 226 and multiple second pole pieces 227. The multiple first pole pieces 226 are all arranged between the two diaphragm strips 222 and are arranged at intervals along the extension direction of the diaphragm strips 222, and the multiple second pole pieces 227 are staggered on the side of the two diaphragm strips 222 that is away from the first pole piece 226, and the multiple second pole pieces 227 correspond one-to-one with the multiple first pole pieces 226, so that the first pole pieces 226 and the corresponding second pole pieces 227 form a composite pole piece unit 221, and there is a gap between adjacent composite pole piece units 221, and a section of the diaphragm strip 222 corresponding to the gap is a bending section 228, which can be bent for bending when the multiple composite pole piece units 221 are folded one by one.

[0083] In other words, the composite pole piece unit 221 includes a second pole piece 227, a diaphragm strip 222, a first pole piece 226 and a diaphragm strip 222 stacked in sequence, and adjacent composite pole piece units 221 are connected by a section of diaphragm strip 222, that is, connected by a bending section 228, and in two adjacent composite pole piece units 221, the second pole piece 227 in one composite pole piece unit 221 is located at the bottom, and the second pole piece 227 in the other composite pole piece unit 221 is located at the top, and the second pole pieces 227 on the composite pole piece strip 22 are arranged alternately up and down. In this way, when multiple composite pole piece units 221 on the composite pole piece strip 22 are folded one by one, the second pole piece 227 on the laminated structure 20 is located between the respective first pole pieces 226 of the two composite pole piece units 221.

[0084] It should be noted that, in the present embodiment, the width of the first pole piece 226 is greater than the width of the second pole piece 227, and the projection of the second pole piece 227 on the first pole piece 226 is located inside the side surface of the first pole piece 226, wherein the width refers to the distance between the first pole piece 226 and the second pole piece 227 on both sides of the extension direction of the corresponding diaphragm strip 222. In other embodiments, the width of the first pole piece 226 may also be less than the width of the second pole piece 227, and the projection of the first pole piece 226 on the second pole piece 227 is located inside the side surface of the second pole piece 227, wherein the width refers to the distance between the first pole piece 226 and the second pole piece 227 on both sides of the extension direction of the corresponding diaphragm strip 222.

[0085] See also Figure 6 , Figure 8 and Fig. 9 , Figure 8 A partial structural schematic diagram of two adjacent composite pole piece units 221 in a laminate structure 20 provided in a third embodiment of the present invention in an extreme misalignment state. Fig. 9 A partial structural schematic diagram of two adjacent composite pole piece units 221 in the laminate structure 20 provided in the third embodiment of the present invention in an aligned state.

[0086] Furthermore, the length δ1 of the bending section 228 may be in the range of:

[0087]

[0088] Among them, W1 is the width of the first pole piece 226, W2 is the width of the second pole piece 227, Ta is the thickness of the first pole piece 226, Tc is the thickness of the second pole piece 227, and Ts is the thickness of the diaphragm strip 222, wherein the width refers to the distance between the first pole piece 226 and the second pole piece 227 on both sides of the corresponding diaphragm strip 222 in the extension direction, and A is the accuracy of the bending section 228, and is a positive value.

[0089] When the length δ1 of the bending section 228 is the maximum value, Figure 8 In the case of, at this time, the upper composite pole piece unit 221 is biased to the left, and the upper first pole piece 226 and the lower second pole piece 227 are staggered, and the lower second pole piece 227 is biased to the left, that is, the left edge of the lower first pole piece 226 is aligned with the left edge of the lower second pole piece 227. At this time, Figure 8 The length of the middle bending section 228 is approximately the sum of the thickness 3Ts of three diaphragm strips 222, the thickness Ta of one first pole piece 226, and the following formula:

[0090]

[0091] When the length of the bending section 228 is less than the maximum value, the upper composite pole piece unit 221 is difficult to move leftward to avoid the upper first pole piece 226 and the lower second pole piece 227 being misaligned, thereby ensuring that the laminate structure 20 has good alignment.

[0092] And when δ1 is the minimum value, that is Fig. 9 In this case, the upper composite pole piece unit 221 is aligned with the lower composite pole piece unit 221, Fig. 9 The length of the middle bending section 228 is: 4Ts+2Ta+Tc+A, so as to ensure that the upper and lower composite pole pieces 221 are aligned, and the bending section 228 will not have a large tensile deformation, thereby improving the quality of the laminate structure 20.

[0093] In summary:

[0094] The third embodiment of the present invention provides a lamination structure 20 which has the characteristic of high lamination operation efficiency.

[0095] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the features in the above embodiments can be combined with each other without conflict, and the present invention can also have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention. In addition, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes that fall within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

Claims

1. A lamination device, characterized in that: It comprises a conveying mechanism (11) and a carrying mechanism (12); The conveying mechanism (11) is used to convey the composite electrode strip (22) downward, wherein the composite electrode strip (22) has a plurality of composite electrode units (221) arranged in sequence and at intervals, and two adjacent composite electrode units (221) are connected via a bendable bending section (228), and the composite electrode unit (221) comprises a diaphragm strip (222), a first electrode (226), another diaphragm strip (222), and a second electrode (227) arranged in sequence and overlapping each other; The bearing mechanism (12) has a stacking plane (121), the stacking plane (121) being used to receive the composite pole piece unit (221), so that a plurality of the composite pole piece units (221) are stacked one after another on the stacking plane (121), thereby forming a stacked structure (20), and the first pole piece (226) in any one of the composite pole piece units (221) in the stacked structure (20) is adjacent to the second pole piece (227) in another adjacent composite pole piece unit (221); The conveying mechanism (11) is two conveying rollers arranged adjacent to each other, and the two conveying rollers are used together to convey the composite electrode unit (221) to the stacking plane (121) along the first direction (A); The stacking plane (121) is provided with a retaining edge (122), the retaining edge (122) being arranged at the edge of the stacking plane (121) to limit the lateral movement of the composite electrode unit (211) on the stacking plane (121), and the distance H between the position where the conveying roller contacts the composite electrode unit (221) and the stacking plane (121) is greater than and less than , wherein W is the distance between two sides of the composite pole piece unit (221) in the extension direction of the composite pole piece strip (22); The lamination device (10) further comprises a movable driving member (13), wherein the movable driving member (13) is connected to the supporting mechanism (12); The moving drive member (13) can drive the supporting mechanism (12) to move downward, so as to keep the distance between the composite pole piece unit (221) located at the top of the stacking structure (20) on the stacking plane (121) and the conveying mechanism (11) unchanged.

2. The lamination device according to claim 1, characterized in that: The direction in which the conveying mechanism (11) conveys the composite electrode strip (22) is a first direction (A), and the first direction (A) is perpendicular to the stacking plane (121) and points to the center of the stacking plane (121).

3. The lamination device according to claim 1 or 2, characterized in that: The lamination device (10) further comprises a guide member (14), wherein the guide member (14) is arranged above the lamination plane (121); The guide member (14) is located between the conveying mechanism (11) and the stacking plane (121).

4. A lamination method, characterized in that: Applied to the lamination device (10) according to any one of claims 1 to 3, the lamination method comprising: The composite pole piece strip (22) is conveyed downward to the stacking plane (121), so that a plurality of composite pole piece units (221) are stacked one by one on the stacking plane (121), thereby forming a stacked structure (20).

5. The lamination method according to claim 4, characterized in that: The lamination method further comprises: The stacking plane (121) is moved downwards to keep the distance between the composite pole piece unit (221) located on the top of the stacking structure (20) on the stacking plane (121) and the conveying mechanism (11) unchanged.

6. A laminate structure, characterized in that: The laminate structure (20) is prepared by the lamination device (10) according to any one of claims 1 to 3, wherein the laminate structure (20) comprises the composite pole piece strip (22), and the composite pole piece strip (22) comprises two diaphragm strips (222), a plurality of first pole pieces (226) and a plurality of second pole pieces (227); The plurality of first pole pieces (226) are all arranged between two diaphragm strips (222), and are arranged at intervals along the extension direction of the diaphragm strips (222); A plurality of second pole pieces (227) are staggeredly arranged on a side of each of the two diaphragm strips (222) away from the first pole piece (226), and the plurality of second pole pieces (227) correspond one-to-one to the plurality of first pole pieces (226), so that the first pole piece (226) and the corresponding second pole piece (227) form the composite pole piece unit (221), and there is a gap between adjacent composite pole piece units (221), and a section of the diaphragm strip (222) corresponding to the gap is a bending section (228), and the bending section (228) can be bent so as to be bent when the plurality of composite pole piece units (221) are folded one by one; The range of the length δ1 of the bending section (228) is: Wherein, W1 is the width of the first pole piece (226), W2 is the width of the second pole piece (227), Ta is the thickness of the first pole piece (226), Tc is the thickness of the second pole piece (227), and Ts is the thickness of the diaphragm strip (222), wherein the width refers to the distance between the first pole piece (226) and the second pole piece (227) on both sides in the extension direction of the corresponding diaphragm strip (222), and A is the accuracy of the bending section (228), which is a positive value.

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