Assembly process, assembly device and assembly equipment for laminated electrode assembly

Abstract

A manufacturing process, assembly device and assembly equipment for a laminated electrode assembly, wherein the process includes the following steps: preparing a first electrode sheet and a second electrode sheet, unfolding the first electrode sheet and standing it upright along the extension direction of the first bend, and placing the second electrode sheet horizontally along the extension direction of the second bend, with the U-shaped opening of the second electrode sheet facing downward. Bringing the first electrode sheet and the second electrode sheet closer together in the up-down direction, placing the second electrode sheet astride the first electrode sheet, with one first electrode sheet interposed between the two second electrode sheets. Folding the first electrode sheet together, an electrode assembly is obtained in which the first electrode sheet and the second electrode sheet are staggered and stacked. The assembly method of this scheme, in the process of assembling the laminated sheets, stretches the first electrode sheet, inserts the second electrode sheet, and pushes the first electrode sheet together. Compared with the process of alternating the first and second electrode sheets in the prior art, this method can effectively improve the manufacturing efficiency of the electrode assembly.

Description

Technical Field

[0001] The present invention relates to the field of battery core manufacturing, and in particular to an assembly process, an assembly device and assembly equipment for a laminated electrode assembly. Background Art

[0002] Currently, environmental and energy issues pose a severe challenge to social progress, and low-carbon and environmentally friendly development has become a major theme for future economic development. Energy storage and efficient utilization have attracted widespread attention, and lithium-ion battery cells exist as the smallest unit of energy storage. Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important part of the sustainable development of the automotive industry. For electric vehicles, battery technology is a crucial factor in their development. A battery is a structural form that effectively connects multiple battery cells. By connecting a certain number of battery cells in series, parallel, or a combination of series and parallel, the power supply needs of electrical devices can be met. Improving the production efficiency of battery cells during their production, transportation, and packaging has become a pressing issue. Summary of the Invention

[0003] In order to solve the technical problem of improving battery production efficiency, the present invention provides a novel manufacturing process for an electrode assembly to improve the production efficiency of the battery electrode assembly.

[0004] The solution of the present invention includes a process for manufacturing a laminated electrode assembly, comprising the following steps:

[0005] Prepare the first and second pole pieces. The first pole piece is a Z-shaped laminate structure formed by reciprocating folding, including four or more first pole laminations, two of which are connected by a first bend. The second pole piece is a U-shaped laminate structure formed by folding in half, including two second pole laminations, two of which are connected by a second bend. Unfold the first pole piece and stand it upright along the direction of the first bend. Place the second pole piece horizontally along the direction of the second bend, with the U-shaped opening of the second pole piece facing downward. Bring the first and second pole pieces closer together in the vertical direction, placing the second pole piece astride the first pole piece, with one first pole lamination between the two second pole laminations. Fold the first pole piece together to obtain an electrode assembly with the first and second pole laminations stacked alternately.

[0006] The above solution can overlap the Z-shaped first pole piece with the U-shaped second pole piece, group the second pole pieces in pairs, and unfold the first pole pieces in groups of multiple pieces, ultimately obtaining an electrode assembly in which the first pole pieces and the second pole pieces overlap in sequence. During the assembly process of the laminations, the assembly method of this solution stretches the first pole piece, inserts the second pole piece, and pushes the first pole piece together. Compared to the prior art process of alternating the first and second pole pieces, the solution of this application can overlap multiple first and second pole pieces at a time, thereby effectively improving the production efficiency of the electrode assembly.

[0007] In one aspect of the present application, a separator is laminated onto the first and / or second electrode sheets during the preparation of the first and second electrode sheets. By laminating the separator onto the first and / or second electrode sheets, the active materials of the first and second electrode sheets can be isolated, thereby preventing the active materials on the first electrode sheet from reacting with the second electrode sheet, thereby improving the safety of the electrode assembly.

[0008] In one aspect of the present application, the diaphragm is laminated to the first electrode sheet and / or the second electrode sheet through a thermal lamination process. The thermal lamination process allows the diaphragm to be more tightly laminated to the electrode sheet, making it less likely to separate. The diaphragm's resistance to separation can better prevent the active material on the first electrode sheet from reacting with the second electrode sheet, thereby further improving the safety of the electrode assembly.

[0009] In one aspect of the present application, a diaphragm is laminated to the first electrode sheet, including covering the side of the first electrode sheet proximate the second bend with the diaphragm, where the side of the first electrode sheet is adjacent to the first bend. The side of the first electrode sheet is likely to come into contact with the second bend of the second electrode sheet and is susceptible to scratches during use or assembly, which may cause the active material to fall. Providing a diaphragm on the side of the first electrode sheet for isolation provides a certain degree of protection and prevents the active material on the side from being exposed and reacting, thereby further improving the safety of the electrode assembly.

[0010] In another aspect of the present application, the diaphragm is composited onto the first electrode piece, including covering the front and back surfaces and edges of the first electrode piece with the diaphragm. Covering the front and back surfaces and edges of the first electrode piece with the diaphragm protects both the side edges and the contact surface of the first electrode piece, preventing the positive and negative electrode active materials from contacting each other and causing a violent reaction, thereby improving the safety of the present solution.

[0011] On the other hand, when preparing the second electrode sheet, an inactive substance is coated or applied to the inner side of the second bend. The inactive substance is a substance that does not react with the electrode material of the first electrode sheet. The corner of the second bend has structural scratches and friction problems with the first electrode sheet. The second bend needs to be attached with an inactive substance as an isolation material to protect the first and second electrode sheets from damage at the second bend. At the same time, the area ratio of the first and second electrode sheets at the bend is extremely asymmetric. Providing an inactive substance here to prevent electrochemical reactions from occurring here can also improve the safety performance of the solution.

[0012] In another aspect of the present application, the inactive substance is selected from one or more ceramic materials. Ceramics, a general term for inorganic non-metallic oxides, have multiple properties, including high hardness, high melting point, good electrical insulation, and strong chemical stability. Selecting them as the inactive substance improves the protection and stability of the second bend of the present application. They also provide electrical insulation, preventing chemical reactions between the second bend and the side of the first electrode, further enhancing the safety of the present solution.

[0013] In another aspect of the present application, the width of the second pole lamination in the direction of the second bend is smaller than the width of the first pole lamination in the direction of the second bend. By designing the width of the second pole lamination to be smaller than the width of the first pole lamination, both sides of the width of the second pole lamination can avoid contact with the first bend of the first pole lamination, avoiding excessive interference that could cause friction damage to the first or second pole lamination, leading to overflow of active material, etc., allowing the battery materials to react directly in the battery. This arrangement can improve battery safety.

[0014] On the other hand, in this solution, when the first pole piece and the second pole piece are brought close to each other in the vertical direction, the angle between the extension direction of the second bend and the plane where the first pole piece is located is 0 degrees to 45 degrees, so that the side of the second pole piece is away from the adjacent first pole piece, and the side of the second pole piece is the adjacent side of the second bend. The opening of the second pole piece can be designed to open at a certain angle during assembly, and the second pole piece has a certain distance at the opening of the second pole piece, which facilitates the assembly of the second pole piece into the first pole piece. The design of the second pole piece with an opening angle during assembly can allow the second pole piece to have a larger tolerance when assembled into the first pole piece, allowing the second bend to be assembled into the first pole piece even when there is a rotation angle, and the maximum tolerance can reach 45 degrees. At the same time, the existence of the angle can make it difficult for the edge of the opening of the second pole piece to scrape the first pole piece. This improves the success rate of assembly.

[0015] In another aspect of this solution, when the first and second pole pieces are brought together vertically, the angle between the extension direction of the second bend and the plane of the first pole piece is 5-10 degrees. If the angle is too small, the opening of the second pole piece can easily scrape against the first pole piece, while if the angle is too large, the side of the second pole piece can easily scrape against the first pole piece. Controlling the angle between the extension direction of the second bend and the plane of the first pole piece to 5-10 degrees can increase the assembly speed while still ensuring the success rate of assembly.

[0016] In another aspect of this solution, when the first pole piece is unfolded and erected along the extension direction of the first bend, the angle between the two adjacent first pole pieces at the first bend is 0-180 degrees. The first pole piece can be fully unfolded, and the second pole piece can be installed at the position corresponding to the first pole piece. The fully unfolded pole piece is not easy to contact the second pole piece, and the side of the second pole piece is not easy to scratch the first pole piece. The first pole piece can also be unfolded at only a very small angle to allow the second pole piece to be assembled and inserted. The first pole piece unfolded at a very small angle can reduce the time required in the closing step, improve the efficiency of assembly, and at the same time, the first pole piece does not need to occupy too much assembly space.

[0017] In another aspect of this solution, when the first pole piece is unfolded and erected along the direction of the first bend, the angle between two adjacent first pole pieces at the first bend is 90-130 degrees. A too small unfolding angle can easily cause the second pole piece to scratch the first pole piece when inserted into it. A too large unfolding angle can increase the time required for the closing step and reduce assembly efficiency. Selecting a 90-130-degree angle balances these issues and achieves the best overall effect.

[0018] In another aspect of this solution, the first electrode piece is unfolded and erected along the extension direction of the first bend by clamping from top to bottom. The clamping mechanism clamps the first electrode piece from above to unfold it, thereby reducing interference between equipment components and facilitating the insertion of the second electrode piece from above.

[0019] In another aspect of this solution, by clamping the first tab on the first electrode sheet, the first electrode sheet is unfolded and erected along the direction of the first bend. Clamping the tab to unfold the first electrode sheet reduces contact and damage to the electrode material of the first electrode sheet caused by the clamping mechanism, thereby better protecting the electrode material.

[0020] In another aspect of this solution, the second electrode sheet is positioned horizontally along the extension direction of the second bend by clamping from top to bottom. This top-down clamping allows the assembly mechanism to primarily contact the second bend, minimizing contact and damage to the electrode material of the second electrode sheet. This improves protection of the electrode material. Furthermore, the second electrode sheet can be assembled into the first electrode sheet using its own weight, ensuring efficient assembly.

[0021] In another aspect of the present application, the first and second pole laminations are rectangular. The first and second pole laminations can be pre-cut to different shapes, as long as the first and second pole laminations have corresponding contact surfaces. The rectangular shape is advantageous in that it facilitates stacking and is relatively simple to cut.

[0022] In another aspect of the present application, both the front and back surfaces of the first and second pole sheets are covered with electrode materials. The stacked first and second pole sheets can react with the adjacent pole sheets before and after, thereby ensuring the energy density of the electrode assembly of this structure.

[0023] The present application also provides an electrode assembly assembly device for assembling a laminated electrode assembly, the laminated electrode assembly comprising: a first electrode sheet, comprising a Z-shaped laminate structure formed by folding more than four first electrode laminates back and forth, and a second electrode sheet, comprising a U-shaped laminate structure formed by folding two second electrode laminates in half, the electrode assembly assembly device comprising: a first electrode sheet positioning mechanism, for unfolding the first electrode sheet and erecting it in the extension direction of the first bending portion, the first bending portion being the connecting portion between the two first electrode laminates; a second electrode sheet positioning mechanism, for placing the second electrode sheet horizontally in the extension direction of the second bending portion with the U-shaped opening facing downward; a hoisting mechanism, for driving the first electrode sheet positioning mechanism and / or the second electrode sheet positioning mechanism to move relative to each other in the up and down directions; and a folding mechanism, for pushing the unfolded first electrode sheet to fold and close.

[0024] The above-mentioned electrode assembly assembly device can unfold the first electrode sheet through the first electrode sheet positioning mechanism, clamp the second electrode sheet through the second electrode sheet positioning mechanism, and the lifting mechanism can overlap the Z-shaped first electrode sheet with the U-shaped second electrode sheet, and finally fold the second electrode sheets into groups of two by folding, and close the first electrode sheets into groups of multiple sheets, and finally obtain an electrode assembly in which the first electrode sheets and the second electrode sheets overlap in sequence. In the process of assembling the stacking sheets, the assembly decoration of this solution can cleverly transform the originally stacked battery cell assembly into a horizontal direction and then insert the sheets. Compared with the process of alternating the first and second electrode sheets in the prior art, the solution of this application can overlap multiple first and second electrode sheets at a time, thereby effectively improving the production efficiency of the electrode assembly.

[0025] In one aspect of the present application, the first pole piece positioning mechanism includes a clamping claw for clamping the first pole piece, or the second pole piece positioning mechanism includes a clamping claw for clamping the second pole piece. Positioning the first pole piece and the second pole piece by the clamping claw can effectively reduce damage to the pole pieces by the positioning mechanism. At the same time, by clamping the second pole piece by the clamping claw, the second pole piece can be released at a preset position above, and gravity is used to allow the second pole piece to be loaded into the first pole piece. This method can reduce interference between the positioning mechanisms.

[0026] In another aspect of the present application, the present invention further includes a rotating mechanism connected to the second pole piece positioning mechanism, configured to drive the second pole piece positioning mechanism to rotate and adjust the angle about a rotation axis parallel to the extension direction of the first bent portion. The setting of the rotating mechanism can adjust the angle of the second connecting portion of the second pole piece relative to the first pole piece. When the first pole piece is unfolded and not completely straightened, there will be an angle between the first pole laminations. The rotating mechanism can adjust the angle of the second pole piece, thereby reducing the risk of scratches during assembly and improving assembly efficiency.

[0027] This solution also provides an electrode assembly assembly device, which includes two or more electrode assembly devices. A first positioning mechanism of a set of electrode assembly devices is used to unfold a first electrode sheet. An overly long first electrode sheet would occupy too much assembly space. The electrode assembly assembly device can be configured with multiple sets of electrode assembly devices, saving space in the longitudinal direction while simultaneously assembling multiple sets of electrode assemblies. The assembled multiple electrode assemblies are compatible with each other and can be stacked to form an electrode assembly with a larger capacity. Therefore, the electrode assembly assembly device further improves the assembly efficiency of the electrode assembly.

[0028] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0030] Figure 1 This is a schematic diagram of an electrode assembly assembly device according to a specific embodiment of the present invention;

[0031] Figure 2 This is a schematic structural diagram of the second bending portion according to a specific embodiment of the present invention;

[0032] Figure 3 This is a schematic diagram of the assembled state of the pole stack according to a specific embodiment of the present invention;

[0033] Figure 4 It is a schematic top view of the pole piece assembly state according to a specific embodiment of the present invention.

[0034] Description of reference numerals:

[0035] 1. The first pole piece;

[0036] 11. First pole lamination;

[0037] 12. First bending portion;

[0038] 2. The second pole piece;

[0039] 21. Second pole lamination;

[0040] 22. Second bending portion;

[0041] 31. First pole piece positioning mechanism;

[0042] 32. Second pole piece positioning mechanism;

[0043] 3. Hoisting mechanism;

[0044] 4. Folding mechanism. DETAILED DESCRIPTION

[0045] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0047] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0048] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0049] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0050] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0051] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top" and "center" are used interchangeably.

[0052] The orientations or positional relationships indicated by “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc. are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the embodiments of the present application and simplifying the description. They 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. Therefore, they cannot be understood as limiting the embodiments of the present application.

[0053] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0054] Currently, market developments indicate that power batteries are becoming increasingly widely used. They are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment and aerospace. As power battery applications continue to expand, market demand is also growing.

[0055] The applicant of this proposal has noticed that the most widely used technical solution in the prior art is to place the positive and negative electrodes opposite each other and then wind them. Compared with the electrode structure that is wound, the laminated structure does not have the corners of the wound structure, the structure is freer and more open, and the internal space utilization of the battery cell is high, the energy density is high, and the performance can also be made better. It is a structural type that is very worthy of promotion. However, at the same time, the production of laminated cells requires cutting, and it cannot be wound and formed as quickly as the wound structure. The production efficiency is currently far from comparable to that of wound cells. However, from the first principles, the structure of regular laminated cells is simple, and each piece can be operated independently. In theory, there is a chance to achieve very high production efficiency.

[0056] The applicant of this proposal also noted that in the existing technology, there are indeed stacked laminated electrode assemblies, some of which fold the opposing positive and negative electrodes into an S-shape, and some of which unfold the positive and negative electrodes in the XY directions and then fold them toward the middle one by one to form a Z-shaped laminated electrode. These mechanisms still have a lot of room for improvement in terms of energy density and insufficient current collection efficiency caused by the way the tabs are set.

[0057] The battery cells disclosed in the embodiments of the present application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft. A power supply system composed of the battery cells and batteries disclosed in the present application can be used.

[0058] The present invention provides an electric device that uses a battery as a power source. The electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, etc. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0059] The applicant of this solution has noticed the above problems and proposed a new type of electrode assembly structure, including a first electrode piece and a second electrode piece. The first electrode piece is a Z-shaped laminate structure formed by reciprocating folding, including more than four first electrode laminates, and the two first electrode laminates are connected by a first bend. The second electrode piece is a U-shaped laminate structure formed by folding in half, including two second electrode laminates, and the two second electrode laminates are connected by a second bend. The advantage of this type of electrode piece is that the anode piece can be unfolded and multiple second electrode pieces can be installed at the same time. The first electrode piece and the second electrode piece can be the anode electrode piece and the cathode electrode piece respectively, and both surfaces can be coated with a diaphragm. The first electrode piece and the second electrode piece are combined to form a click assembly that can provide current.

[0060] We explain this assembly process and the corresponding assembly equipment as follows.

[0061] This solution provides an electrode assembly device, which includes two or more electrode assembly devices. The first positioning mechanism of a set of electrode assembly devices is used to unfold the first electrode sheet. A first electrode sheet that is too long will occupy too much assembly space. The electrode assembly device can be equipped with multiple sets of electrode assembly devices, saving space in the length direction while being able to assemble multiple sets of electrode assemblies at the same time. The assembled multiple electrode assemblies are compatible with each other and can be stacked to form an electrode assembly with a larger capacity. Therefore, the electrode assembly device better improves the assembly efficiency of the electrode assembly. The electrode assembly device can place multiple sets of electrode assembly devices side by side, or connect multiple sets of electrode assembly devices end to end.

[0062] In order to further improve the assembly efficiency, the electrode assembly assembly equipment may also include an electrode assembly transportation device, such as a cart, conveyor belt, etc., to carry the assembled electrode assemblies. The electrode assembly assembly equipment may also include an electrode assembly stacking device, which is used to hold the assembled electrode assemblies and stack them into a large-volume electrode assembly along the thickness direction. The electrode assembly assembly equipment may also include an electrode assembly welding device, which can weld the tabs of the large-volume electrode assembly to obtain an electrode that can output electrical energy to the outside. The electrode assembly assembly equipment may also include an electrode assembly shell insertion device, which is used to assemble the battery cells in the manner of assembling the battery cells into the shells.

[0063] See below Figure 1 as well as Figure 2 , showing the assembly device of the electrode assembly of the present application. The present application also provides an electrode assembly assembly device for assembling a laminated electrode assembly, the laminated electrode assembly comprising: a first electrode sheet 1, comprising a Z-shaped laminate structure formed by folding more than four first electrode laminates 11 back and forth, and a second electrode sheet 2, comprising a U-shaped laminate structure formed by folding two second electrode laminates 21 in half. The electrode assembly assembly device comprises: a first electrode sheet positioning mechanism 31, for unfolding the first electrode sheet 1 and erecting it along the extension direction of the first bending portion 12, the first bending portion 12 being the connecting portion between the two first electrode laminates 11; a second electrode sheet positioning mechanism 32, for horizontally placing the second electrode sheet 2 along the extension direction of the second bending portion 22 with the U-shaped opening facing downward; a hoisting mechanism, for driving the first electrode sheet positioning mechanism 31 and / or the second electrode sheet positioning mechanism 32 to move relative to each other in the up and down directions; and a folding mechanism 4, for pushing the unfolded first electrode sheet 1 to fold and close.

[0064] The first pole piece positioning mechanism 31 only needs to be able to fix the laminate structure, and can be one or more of a clamp, a suction cup, a slot, and an adhesive. In a preferred embodiment, the first pole piece positioning mechanism 31 can only fix the outermost laminate of the first pole piece 1, and the first pole piece positioning mechanism 31 can also move horizontally to adjust the deployment angle of the first pole piece 1. The first pole piece positioning mechanism 31 can also clamp multiple first pole laminates 11 of the first pole piece 1, and adjust the deployment angle by adjusting the distance between the multiple first pole laminates 11. The first pole piece positioning mechanism 31 can also be configured to be rotatable in the horizontal direction.

[0065] The second pole piece positioning mechanism 32 only needs to be able to secure the second pole piece 2 and can be one or more of a clamping claw, a suction cup, a slot, or an adhesive. The second pole piece positioning mechanism 32 secures the second pole piece 2. In some embodiments, the second pole piece positioning mechanism 32 can be configured to rotate horizontally to accommodate different operating angles of the first pole piece 11.

[0066] The first bending portion 12 is a portion of the first pole piece 1 that separates different first pole laminations 11, and the first pole laminations 11 are connected to each other through the first bending portion 12. In some embodiments,

[0067] The first bending portion 12 is obtained by carving a crease on the normal first pole piece 1. Carving a slight crease on the pole piece helps to fold the first pole piece 1. At the same time, the crease will not damage the structure of the first pole piece 1. This carving method can refer to the existing technology and does not require special explanation.

[0068] The second bend 22 is a portion of the second pole piece 2 that separates different second pole laminations 21. The second pole laminations 21 are connected to each other through the second bend 22 to form a U-shaped second pole piece 2. Similarly, the second bend 22 can be made by scoring in the prior art.

[0069] The hoisting mechanism 3 can drive the first pole piece positioning mechanism 31 and the second pole piece positioning mechanism 32 to move relative to each other, so that the two second pole laminations 21 of the second pole piece 2 can be respectively attached to the two sides of the first pole lamination 11, and the second bent portion 22 can straddle the side of the first pole lamination 11. The driving mechanism of the hoisting mechanism 3 can be a cylinder, a hydraulic cylinder, a motor, an electric motor, etc. The hoisting mechanism 3 can be a transmission rod connecting each second pole piece positioning mechanism 32, such as Figure 1 The driving mechanism drives the movement of the hoisting mechanism 3, thereby driving the first pole piece positioning mechanism 31 and the second pole piece positioning mechanism 32, thereby completing the technical effect of assembling the motor assembly.

[0070] The folding mechanism 4 can control the folding of the first pole piece positioning mechanism 31. The folding mechanism 4 can be a push rod or a push plate. Figure 1 In the illustrated embodiment, the folding mechanism 4 is configured as a push plate. Upon assembly, the folding mechanism 4 is achieved by pushing inward from both ends of the first pole laminations 11. The folding mechanism 4 can also be configured to drive the horizontal movement of the first pole piece positioning mechanism 31. By horizontally moving the first pole piece positioning mechanism 31, the first pole laminations 11 can also be moved, thereby achieving the technical effect of closing the first pole piece 1.

[0071] The above-mentioned electrode assembly assembly device can unfold the first electrode 1 through the first electrode positioning mechanism 31, clamp the second electrode 2 through the second electrode positioning mechanism 32, and the lifting mechanism 3 can overlap the Z-shaped first electrode 1 with the U-shaped second electrode 2, and finally fold the second electrode laminations 21 into groups of two by folding, and close the first electrode laminations 11 into groups of multiple, and finally obtain an electrode assembly in which the first electrode laminations 11 and the second electrode laminations 21 overlap in sequence. In the process of assembling the laminations, the assembly decoration of this scheme can cleverly transform the originally stacked battery cell assembly into a horizontal direction and then insert the laminations. Compared with the process of alternating the first electrode 1 and the second electrode 2 in the prior art, the scheme of the present application can overlap multiple first electrode laminations 11 and the second electrode laminations 21 at a time, thereby effectively improving the production efficiency of the electrode assembly.

[0072] In some other specific embodiments, the first pole piece positioning mechanism 31 includes a clamping claw for clamping the first pole piece 1, or the second pole piece positioning mechanism 32 includes a clamping claw for clamping the second pole piece 2. The clamping claw can realize the positioning of the second pole piece 2 by clamping the second bent portion 22 of the second pole piece 2, and can also realize the positioning of the first pole piece 1 by clamping the pole ear and other positions of the first pole piece 1. There are multiple clamping claws for clamping the second pole piece 2, and each clamping claw is spaced a predetermined distance apart so that the position of the second pole piece 2 can correspond to the position of the second pole piece 2 in a preset manner on the first pole piece 1. There can also be only one or several clamping claws for clamping the second pole piece 2, and the second pole piece 2 is assembled by clamping the second pole piece 2 multiple times and then moving it to a preset position. Setting the clamping claws according to the preset number of second pole pieces 2 to be assembled can achieve the highest efficiency. Positioning the first pole piece 1 and the second pole piece 2 by means of the clamping jaws can effectively reduce the damage to the pole pieces caused by the positioning mechanism. At the same time, by clamping with the clamping jaws, the second pole piece 2 can be released at the preset position above, and gravity can be used to allow the second pole piece 2 to be installed into the first pole piece 1. This method can reduce the interference between the positioning mechanisms, thereby improving the safety of assembly.

[0073] In some other embodiments of the present solution, the electrode assembly assembly device further includes: a rotating mechanism (not shown in the figure), the rotating mechanism is connected to the second pole piece positioning mechanism 32, and is used to drive the second pole piece positioning mechanism 32 to rotate and adjust the angle along a rotation axis parallel to the extension direction of the first bending portion 12. In an embodiment in which the first pole piece 1 is unfolded in the horizontal direction, the rotating mechanism can adjust the horizontal angle of the second pole piece positioning mechanism 32. Therefore, a plurality of rotating mechanisms can be provided, each rotating mechanism controls the position angle of a second pole piece positioning mechanism 32. The provision of the rotating mechanism can adjust the angle of the second connecting portion of the second pole piece 2 relative to the first pole piece 1. When the first pole piece 1 is unfolded and not completely straightened, there will be an angle between the first pole laminations 11. The angle of the second pole piece 2 can be adjusted by the rotating mechanism, thereby reducing the risk of scratches during assembly and improving assembly efficiency.

[0074] Other embodiments of the present invention also include a process for manufacturing a laminated electrode assembly, comprising the following steps: preparing a first electrode sheet 1 and a second electrode sheet 2, wherein the first electrode sheet 1 is a Z-shaped laminate structure formed by reciprocating folding, comprising at least four first electrode laminates 11, two of which are connected by a first bend 12; and the second electrode sheet 2 is a U-shaped laminate structure formed by folding in half, comprising two second electrode laminates 21, two of which are connected by a second bend 22. The first electrode sheet 1 is unfolded and placed upright along the direction of the first bend 12, and the second electrode sheet 2 is placed horizontally along the direction of the second bend 22, with the U-shaped opening of the second electrode sheet 2 facing downward. The first electrode sheet 1 and the second electrode sheet 2 are brought together in a vertical direction, with the second electrode sheet 2 straddling the first electrode sheet 1, with one first electrode laminate 11 between the two second electrode laminates 21. The first electrode sheet 1 is folded together to form an electrode assembly in which the first electrode laminates 11 and the second electrode laminates 21 are interleaved.

[0075] As shown in the figure, when the first pole piece 1 is unfolded and the first bent portion 12 extends in an upright direction, the multiple first pole laminations 11 extend in the horizontal direction, and the first bent portion 12 extends in the vertical direction. When the first pole piece 1 is unfolded, an angle can be formed between the first pole laminations 11. From the figure, we can also see that the second pole piece 2 sits astride the first pole piece 1, which means that a first pole lamination 11 is clamped between the two second pole laminations 21 of the second pole piece 2, and the second bent portion 22 fits the side of the first pole lamination 11. Similarly, the side of every other first pole lamination 11 is used to support the second pole piece 2, and the side of the first pole lamination 11 without a second pole piece 2 can lead out the pole lug. In this way, after folding, the structure is an alternating stacking of a layer of first pole laminations 11 and a layer of second pole laminations 21 when viewed in the thickness direction.

[0076] The above solution can overlap the Z-shaped first pole piece 1 with the U-shaped second pole piece 2, group the second pole pieces 21 in pairs, and unfold the first pole pieces 11 in groups of multiple pieces, ultimately obtaining an electrode assembly in which the first pole pieces 11 and the second pole pieces 21 overlap in sequence. During the assembly process of the laminations, the assembly method of this solution stretches the first pole piece 1, inserts the second pole piece 2, and pushes the first pole piece 1 together. Compared to the prior art process of alternating the first pole piece 1 and the second pole piece 2, the solution of this application can overlap multiple first pole pieces 11 and second pole pieces 21 at a time, thereby effectively improving the production efficiency of the electrode assembly.

[0077] In some other embodiments of the present application, when preparing the first electrode 1 and the second electrode 2, a diaphragm is compounded on the first electrode 1 and / or the second electrode 2. The diaphragm is an important component that separates the positive and negative electrodes of the battery to prevent the two electrodes from contacting and short-circuiting. In addition, it has the function of allowing electrolyte ions to pass through. The diaphragm material is non-conductive, and its physical and chemical properties have a great influence on the performance of the battery. Different types of batteries use different diaphragms. The specific material of the diaphragm can be selected with reference to existing methods. The above scheme can isolate the active substances of the first electrode 1 and the second electrode 2 by compounding the diaphragm on the first electrode 1 and / or the second electrode 2, thereby preventing the active substances on the first electrode 1 from reacting with the second electrode 2, thereby improving the safety of the electrode assembly.

[0078] In some embodiments of the present application, the diaphragm is laminated to the first electrode piece 1 and / or the second electrode piece 2 via a thermal lamination process. The thermal lamination process involves applying heat and pressure to shrink the diaphragm after it is attached to the electrode piece, thereby ensuring a tight fit between the diaphragm and the electrode piece. The thermal lamination process allows the diaphragm to be more tightly bonded to the electrode piece, making it more difficult to separate. The diaphragm's resistance to separation can better prevent the active material on the first electrode piece 1 from reacting with the second electrode piece 2, thereby improving the safety of the electrode assembly.

[0079] In some embodiments of the present application, the following steps are further performed to laminate the diaphragm onto the first electrode sheet 1, including covering the side of the first electrode laminate 11 close to the second bend 22 with the diaphragm, and the side of the first electrode laminate 11 is adjacent to the first bend 12. As can be seen from the figure, the side of the first electrode laminate 11 close to the second bend 22 is the upper side in the figure. The side of the first electrode laminate 11 is the part that easily contacts the second bend 22 of the second electrode sheet 2 and is easily scratched during use / assembly, thereby causing the active material to fall off. In actual applications, it is only necessary to laminate the side of the first electrode sheet 1 with the diaphragm when manufacturing the first electrode sheet 1 to protect the side of the first electrode laminate 11. Providing a diaphragm on the side of the first electrode laminate 11 for isolation can provide a certain degree of protection, while also preventing the active material on the side from being exposed and reacting, thereby better improving the safety of the electrode assembly.

[0080] In other embodiments of this solution, the diaphragm is composited onto the first electrode piece 1, including covering the front and back surfaces and edges of the first electrode piece 1. Covering the front and back surfaces and edges of the first electrode piece 1 with the diaphragm protects both the side edges and the contact surface of the first electrode piece 1, preventing the positive and negative electrode active materials from contacting each other and causing a violent reaction, thereby improving the safety of this solution.

[0081] In other embodiments of the present application, when preparing the second electrode sheet 2, an inactive material is coated or applied to the inner side of the second bent portion 22. The inactive material is a material that does not react with the electrode material of the first electrode sheet 1. Figure 2 In the embodiment shown, the structure of the second bend portion 22 is shown. It can be seen in the figure that the second bend portion 22 can be set to an arc shape. There are structural scratches and friction problems between the corners of the second bend portion 22 and the first pole piece 1. The second bend portion 22 needs to be attached with an inactive substance as an isolation material to protect the first pole piece 1 and the second pole piece 2 from damage at the second bend portion 22. At the same time, the area ratio of the first pole piece 1 and the second pole piece 2 at the bend is extremely asymmetric. It is undesirable for a chemical reaction to occur here, which causes the local rate to be broken and lead to uncontrollable results. Providing an inactive substance here to prevent the electrochemical reaction from occurring here can also improve the safety performance of the solution.

[0082] On the other hand, the inactive substance is selected from one or more ceramic materials. It is a type of inorganic non-metallic material made by forming and high-temperature sintering natural or synthetic compounds. It has the advantages of high melting point, high hardness, high wear resistance, oxidation resistance, etc. Ceramic materials include but are not limited to: aluminum oxide, silicon nitride, silicon carbide, boron carbide, silicon oxide, etc. The method for obtaining ceramic materials can refer to the existing technology. In this solution, the inactive substance is selected from one or more ceramic materials. The selection of ceramic as the inactive substance can make the second bend 22 of the present application have good protection performance and strong stability, and can also be electrically insulated to prevent chemical reactions from occurring on the side of the second bend 22 and the first electrode, which can further improve the safety of this solution.

[0083] In some embodiments of this application, please see Figure 3 The width of the second pole lamination 21 in the direction of the second bend 22 is smaller than the width of the first pole lamination 11 in the direction of the second bend 22. As can be seen from the figure, setting the width of the second bend 22 smaller than the width of the first pole lamination 11 ensures that when the first pole piece 1 is folded, both ends of the second bend 22 will not touch the first bend 12 at the same time, thereby avoiding structural interference between the two.

[0084] By designing the width of the second pole piece 21 to be smaller than the width of the first pole piece 11, both sides of the width of the second pole piece 21 will not contact the first bend portion 12 of the first pole piece 1 at the same time, avoiding excessive interference that may cause friction damage to the first pole piece 1 or the second pole piece 2, leading to overflow of active materials, etc., so that the battery materials react directly in the battery. The above arrangement can improve the safety of the battery. From the perspective of the assembly process, setting the width of the second pole piece 2 to be smaller than the width of the first pole piece 11 also allows the second pole piece positioning mechanism 32 to have a larger position tolerance. Regardless of whether the second pole piece positioning mechanism 32 is positioned toward either side of the first bend portion 12, as long as the position deviation does not exceed the difference between the width of the second pole piece 2 and the width of the first pole piece 11, it will not cause scratches on the side of the second pole piece 2 and the first pole piece 1. Therefore, the above arrangement also improves the fault tolerance of the manufacturing process.

[0085] In some other embodiments of this solution, please see here Figure 4, which shows a top view of the first and second pole pieces 1 and 2 in the assembled state. When the first and second pole pieces 1 and 2 are brought together vertically, the angle between the extension direction of the second bend 22 and the plane of the first pole piece 11 is between 0 and 45 degrees. The dotted line in the figure represents the obscured first pole piece 11. This angle allows the side of the second pole piece 21 to be positioned away from the adjacent first pole piece 11, with the side of the second pole piece 21 being adjacent to the second bend 22. The opening of the second pole piece 2 can be designed to open at a certain angle during assembly, with the second pole piece 21 positioned at a certain distance from the opening of the second pole piece 2, facilitating assembly of the second pole piece 2 into the first pole piece 1. Designing the second pole piece 2 with an angle during assembly allows for greater tolerance when fitting the second pole piece 2 into the first pole piece 1, allowing the second bend 22 to fit into the first pole piece 1 even when rotated, with a maximum tolerance of 45 degrees. At the same time, the included angle can prevent the edge of the opening of the second pole piece 2 from scraping the first pole piece 1, thereby improving the success rate of assembly.

[0086] Some further examples of this solution can be found here. Figure 4 When the first and second pole pieces 1 and 2 are brought together vertically, the angle between the extension direction of the second bent portion 22 and the plane of the first pole piece 11 is 5-10 degrees. If the angle is too small, the opening of the second pole piece 2 can easily scrape against the first pole piece 1. If the angle is too large, the side of the second pole piece 2 can easily scrape against the first pole piece 1. Controlling the angle between the extension direction of the second bent portion 22 and the plane of the first pole piece 11 to 5-10 degrees can increase the assembly speed while still ensuring the success rate of assembly.

[0087] In some embodiments of this solution, please continue to refer to Figure 4 , when the first pole piece 1 is unfolded and erected along the extension direction of the first bend 12, the angle between the two adjacent first pole laminations 11 at the first bend is 0-180 degrees. It is not difficult to see from the figure that in the assembled state, the first pole piece 1 can be fully unfolded, and the second pole piece 2 can be installed at the position of the corresponding first pole lamination 11. The fully unfolded pole piece is not easy to contact the second pole piece 2, and the side of the second pole piece 2 is not easy to scratch the first pole piece 1. The first pole piece 1 can also be unfolded at only a very small angle to allow the second pole piece 2 to be assembled and inserted. The first pole piece 1 unfolded at a very small angle can reduce the time required in the closing step and improve the efficiency of assembly. At the same time, the first pole piece 1 does not need to occupy too much assembly space.

[0088] In some further embodiments of this solution, please continue to refer to Figure 4When the first pole piece 1 is unfolded and erected along the extension direction of the first bend 12, the angle between the two adjacent first pole laminations 11 at the first bend is 90-130 degrees. As can be seen from the figure, the angle between the two first pole laminations 11 here is 90 degrees. If the unfolding angle of the first pole piece 1 is too small, the side of the second pole piece 2 will easily scratch the first pole piece 1 when it is installed into the first pole piece 1. If the unfolding angle is too large, the time required for the closing step will increase, reducing the efficiency of assembly. Selecting 90-130 degrees can take into account the above problems and achieve the comprehensive effect of improving product yield while ensuring assembly efficiency.

[0089] In some embodiments of this solution, the first pole piece 1 is unfolded and erected along the extending direction of the first bent portion 12 by clamping from top to bottom. Figure 1 As can be seen in the figure, the positioning mechanism is located at the top. During assembly, the first electrode positioning mechanism 31 pulls the first electrode 1 apart from the top, and the space between them can be used to install the second electrode positioning mechanism 32 to operate the second electrode 2. The clamping mechanism clamps the first electrode 1 from above to expand it, which reduces interference between equipment components and facilitates the installation of the second electrode 2 from above.

[0090] In some embodiments of this solution, Figure 1 As shown, by clamping the first tab on the first pole piece 1, the first pole piece 1 is unfolded and erected along the direction of the first bend 12. The benefits of upright assembly are evident from the figure: the second pole piece 2 can be assembled using its own weight, minimizing contact between the second pole piece positioning mechanism 32 and the second pole piece 2. During assembly, the first pole piece 1 can be designed such that the direction of the first bend 12 extends at an angle to the vertical, such as a 0°-90° angle. As the first bend 12 becomes increasingly horizontal, the second pole piece 2 will come into greater and greater direct contact with the first pole piece 1 during assembly, increasing pressure and, consequently, friction. The upright placement of the first bend 12 minimizes friction between the pole pieces. Furthermore, clamping the tab to unfold the first pole piece 1 reduces contact and damage to the electrode material of the first pole piece 1 by the clamping mechanism, thereby better protecting the electrode material.

[0091] In some other embodiments of the present solution, the second pole piece 2 is placed horizontally along the extension direction of the second bend portion 22 by clamping from top to bottom. The second pole piece 2 is assembled from top to bottom by clamping, so that the assembly mechanism mainly contacts the second bend portion 22, which can reduce the contact and damage between the clamping mechanism and the electrode material of the second pole piece 2. This can better protect the electrode material. The second bend portion 22 of the second pole piece 2 is set to be placed horizontally, so that the second pole piece 2 can be assembled into the first pole piece 1 by its own gravity, and one of the edges will not be lifted up and scratched with the first pole piece 1. The above solution ensures both the efficiency and success rate of assembly.

[0092] In some other embodiments of the present application, the first pole lamination 11 and the second pole lamination 21 are rectangular. The first pole lamination 11 and the second pole lamination 21 can be different according to the pre-cut shapes, and it is only necessary for the first pole piece 1 and the second pole piece 2 to have corresponding contact surfaces. When cutting the metal foil, the shape of the first pole lamination 11 of the preset first pole piece 1 can be set to: circle, ellipse, diamond, square, trapezoid, triangle, etc. Preferably, the first pole lamination 11 and the second pole lamination 21 are set to a rectangular shape. The advantage of selecting the first pole lamination 11 and the second pole lamination 21 as a rectangle is that they are easy to stack and cutting is relatively simple. It is only necessary to cut the long strip of the first pole piece 1 and make a crease perpendicular to the long side.

[0093] In some embodiments of the present application, electrode materials are coated on both the front and back surfaces of the first electrode sheet 1 and the second electrode sheet 2. Coating both the front and back surfaces of the first electrode sheet 1 and the second electrode sheet 2 with electrode materials allows the stacked first electrode stack 11 and the second electrode stack 21 to react with both the front and back adjacent electrode stacks, thereby ensuring the energy density of the electrode assembly of this structure.

[0094] In some comprehensive embodiments of the present application, there is provided an electrode assembly assembly device, the assembly device including two or more electrode assembly devices; an electrode assembly assembly device for assembling a laminated electrode assembly, the electrode assembly assembly device including: a first electrode positioning mechanism 31 for unfolding the first electrode 1 and erecting it along the extension direction of the first bend 12, the first bend 12 being the connecting portion between the two first electrode laminates 11; a second electrode positioning mechanism 32 for placing the second electrode 2 horizontally along the extension direction of the second bend 22 with the U-shaped opening facing downward; a hoisting mechanism 3 for driving the first electrode positioning mechanism 31 and / or the second electrode positioning mechanism 32 to move relative to each other in the up and down directions; and a folding mechanism 4 for pushing the unfolded first electrode 1 to fold and close. Both the first electrode positioning mechanism 31 and the second electrode positioning mechanism 32 can be clamps, the clamps of the first electrode positioning mechanism 31 clamping the ear portion of the first electrode 1, and the second electrode positioning mechanism 32 clamping the second bend 22 of the second electrode 2. The second pole piece positioning mechanism 32 is further adapted to adjust the angle via a rotating mechanism.

[0095] The above-mentioned electrode assembly assembly device and electrode assembly equipment can unfold the first electrode 1 through the first electrode positioning mechanism 31, clamp the second electrode 2 through the second electrode positioning mechanism 32, and the lifting mechanism 3 can overlap the Z-shaped first electrode 1 with the U-shaped second electrode 2. Finally, by folding the second electrode laminations 21 into groups of two, and closing the first electrode laminations 11 into groups of multiple, finally obtaining an electrode assembly in which the first electrode laminations 11 and the second electrode laminations 21 overlap in sequence. In the process of assembling the laminations, the assembly decoration of this scheme can cleverly transform the originally stacked battery cell assembly into a horizontal direction and then insert the laminations. Compared with the process of alternating the first electrode 1 and the second electrode 2 in the prior art, the scheme of the present application can overlap multiple first electrode laminations 11 and the second electrode laminations 21 at a time, thereby effectively improving the production efficiency of the electrode assembly.

[0096] In other comprehensive embodiments of the present application, an electrode assembly assembly process includes the following steps: preparing a first electrode sheet 1 and a second electrode sheet 2; unfolding the first electrode sheet 1 by clamping from top to bottom and placing it upright along the direction of the first bend 12; and clamping the second electrode sheet 2 by clamping from top to bottom and placing it horizontally along the direction of the second bend 22, with the U-shaped opening of the second electrode sheet 2 facing downward. The first electrode sheet 1 and the second electrode sheet 2 are brought together in a vertical direction, with the second electrode sheet 2 straddling the first electrode sheet 1, with one first electrode sheet 11 between two second electrode sheets 21. The first electrode sheet 1 is folded together to obtain an electrode assembly in which the first electrode sheets 11 and the second electrode sheets 21 are stacked alternately. A separator is laminated to the outside of the first electrode sheet 1 and the second electrode sheet 2 via a thermal lamination process, and an inactive ceramic material is coated on the inner surface of the second bend 22. The second electrode sheet 21 is trimmed so that the width along the direction of the second bend 22 is smaller than the width of the first electrode sheet 11 along the direction of the second bend 22. When the first pole piece 1 and the second pole piece 2 are brought close to each other in the vertical direction, the angle between the extension direction of the second bend portion 22 and the plane where the first pole lamination 11 is located is 5 degrees to 10 degrees. When the first pole piece 1 is unfolded and erected in the extension direction of the first bend portion 12, the angle between the two adjacent first pole laminations 11 at the first bend is 90-130 degrees. The above scheme can overlap the Z-shaped first pole piece 1 and the U-shaped second pole piece 2, group the second pole laminations 21 in pairs, and unfold the first pole laminations 11 in multiple groups, and finally obtain an electrode assembly in which the first pole laminations 11 and the second pole laminations 21 overlap in sequence. In the assembly method of this scheme, during the process of assembling the laminations, by stretching the first pole piece 1, inserting the second pole piece 2, and pushing the first pole piece 1 together, compared with the process of alternating the first pole piece 1 and the second pole piece 2 in the prior art, the scheme of this application can overlap multiple first pole laminations 11 and the second pole laminations 21 at a time, thereby effectively improving the production efficiency of the electrode assembly.

[0097] The above descriptions are merely embodiments of the present invention and are not intended to limit the scope of patent protection of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention's description and drawings, or directly or indirectly applied in other related technical fields, are also included in the scope of patent protection of the present invention.

Claims

1. A process for manufacturing a laminated electrode assembly, characterized in that: The following steps are involved: Prepare a first pole piece and a second pole piece, wherein the first pole piece is a Z-shaped laminate structure formed by reciprocating folding, including four or more first pole laminations, two of which are connected by a first bend; and the second pole piece is a U-shaped laminate structure formed by folding in half, including two second pole laminations, the two second pole laminations being connected by a second bend; Unfold the first pole piece and place it upright along the extension direction of the first bent portion, and place the second pole piece horizontally along the extension direction of the second bent portion, with the U-shaped opening of the second pole piece facing downward; Bring the first pole piece and the second pole piece closer together in the vertical direction, place the second pole piece astride the first pole piece, and space one first pole piece between two second pole pieces; The first pole sheets are folded together to obtain an electrode assembly in which the first pole sheets and the second pole sheets are alternately stacked.

2. The manufacturing process of the laminated electrode assembly according to claim 1, characterized in that: When preparing the first pole piece and the second pole piece, the diaphragm is compounded on the first pole piece and / or the second pole piece.

3. The manufacturing process of the laminated electrode assembly according to claim 2, characterized in that: The diaphragm is composited onto the first pole piece and / or the second pole piece through a thermal composite process.

4. The manufacturing process of the laminated electrode assembly according to claim 3, characterized in that: The step of combining the diaphragm with the first pole piece includes covering the side of the first pole lamination close to the second bent portion with the diaphragm, where the side of the first pole lamination is adjacent to the first bent portion.

5. The manufacturing process of the laminated electrode assembly according to claim 4, characterized in that: Compounding the diaphragm on the first pole piece includes covering the front and back surfaces and the edge of the first pole piece with the diaphragm.

6. The manufacturing process of the laminated electrode assembly according to any one of claims 1 to 5, characterized in that: When preparing the second pole piece, an inactive substance is coated or covered on the inner side surface of the second bent portion. The inactive substance is a substance that does not react with the electrode material of the first pole piece.

7. The manufacturing process of the laminated electrode assembly according to claim 6, characterized in that: The inactive substance is selected from one or more ceramic materials.

8. The manufacturing process of the laminated electrode assembly according to any one of claims 1 to 7, characterized in that: The width of the second pole lamination in the extending direction of the second bent portion is smaller than the width of the first pole lamination in the extending direction of the second bent portion.

9. The manufacturing process of the laminated electrode assembly according to any one of claims 1 to 8, characterized in that: When the first pole piece and the second pole piece are brought close to each other in the up and down directions, the angle between the extension direction of the second bent portion and the plane where the first pole lamination is located is 0 degrees to 45 degrees, so that the side of the second pole lamination is away from the adjacent first pole lamination, and the side of the second pole lamination is the adjacent side of the second bent portion.

10. The manufacturing process of the laminated electrode assembly according to claim 9, characterized in that: When the first pole piece and the second pole piece are brought close to each other in the up-down direction, the angle between the extending direction of the second bent portion and the plane where the first pole lamination is located is 5 degrees to 10 degrees.

11. The manufacturing process of the laminated electrode assembly according to any one of claims 1 to 10, characterized in that: When the first pole piece is unfolded and erected along the extending direction of the first bent portion, the angle between two adjacent first pole laminations at the first bend is 0-180 degrees.

12. The manufacturing process of the laminated electrode assembly according to claim 11, characterized in that: When the first pole piece is unfolded and erected along the extending direction of the first bent portion, the angle between two adjacent first pole laminations at the first bend is 90-130 degrees.

13. The manufacturing process of the laminated electrode assembly according to any one of claims 1 to 12, characterized in that: The first pole piece is unfolded and erected along the extending direction of the first bent portion by clamping from top to bottom.

14. The manufacturing process of the laminated electrode assembly according to claim 13, characterized in that: By clamping the first pole tab on the first pole piece, the first pole piece is unfolded and erected along the extending direction of the first bent portion.

15. The manufacturing process of the laminated electrode assembly according to any one of claims 1 to 14, characterized in that: The second pole piece is placed horizontally along the extending direction of the second bent portion by clamping from top to bottom.

16. The manufacturing process of the laminated electrode assembly according to any one of claims 1 to 15, characterized in that: The first pole lamination and the second pole lamination are rectangular.

17. The manufacturing process of the laminated electrode assembly according to any one of claims 1 to 16, characterized in that: Both the front and back surfaces of the first pole piece and the second pole piece are covered with electrode materials.

18. An electrode assembly assembly device for assembling a laminated electrode assembly, the laminated electrode assembly comprising: The first electrode sheet comprises a Z-shaped laminate structure formed by folding more than four first electrode laminates back and forth, wherein two of the first electrode laminates are connected by a first bend; and the second electrode sheet comprises a U-shaped laminate structure formed by folding two second electrode laminates in half, wherein the two second electrode laminates are connected by a second bend. The electrode assembly assembly device comprises: a first pole piece positioning mechanism, for unfolding the first pole piece and erecting it along the extending direction of the first bent portion, wherein the first bent portion is a connecting portion between two first pole laminations; A second pole piece positioning mechanism, used for placing the second pole piece horizontally along the extension direction of the second bent portion with the U-shaped opening facing downward; a hoisting mechanism, configured to drive the first pole piece positioning mechanism and / or the second pole piece positioning mechanism to move relative to each other in an up-down direction; The folding mechanism is used to push the unfolded first pole piece to fold and close.

19. The electrode assembly assembly device according to claim 18, wherein: The first pole piece positioning mechanism includes a clamping claw for clamping the first pole piece, or the second pole piece positioning mechanism includes a clamping claw for clamping the second pole piece.

20. The electrode assembly assembly device according to claim 18 or 19, characterized in that: Also includes: A rotating mechanism is connected to the second pole piece positioning mechanism and is used to drive the second pole piece positioning mechanism to rotate and adjust the angle about a rotation axis parallel to the extending direction of the first bending portion.

21. An electrode assembly assembly device, comprising two or more electrode assembly devices according to any one of claims 18 to 20.

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