Electrochemical energy storage device and manufacturing method

Abstract

The present invention relates to the field of battery technology, and provides an electrochemical energy storage device and a manufacturing method. The electrochemical energy storage device includes an inner layer separator, a plurality of negative electrode sheets, a plurality of positive electrode sheets, a negative electrode lead structure, and a positive electrode lead structure. The inner layer separator has a plurality of first accommodating cavities and a plurality of second accommodating cavities. Each first accommodating cavity has a second opening. Each second accommodating cavity has a fifth opening. The negative electrode lead structure is arranged at the end side of the second opening of each first accommodating cavity and connected to each negative electrode sheet, and the positive electrode lead structure is arranged at the end side of the fifth opening of each second accommodating cavity and connected to each positive electrode sheet. The inner layer separator is continuously bent in the vertical direction, and the accommodating space of each electrode sheet is increased under the same volume, and the volume utilization rate is high. The "de-ear" structure is adopted, and each electrode sheet is led outward, so that the active material in the energy storage device accounts for a higher proportion and the energy density is higher.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to an electrochemical energy storage device and a method for manufacturing the electrochemical energy storage device. Background Art

[0002] In recent years, the new energy industry has attracted more and more attention, especially the development of energy storage devices as power sources has been very active. In order to replace the existing lead-acid batteries, various forms of energy storage devices have been proposed. Among these energy storage devices, double-layer capacitors with excellent energy rapid regeneration capabilities have attracted attention. However, the energy density of double-layer capacitors is too low, which limits their large-scale energy storage applications. Therefore, some people have proposed a lithium-ion supercapacitor, which uses activated carbon for the positive electrode, a carbon material that can adsorb and desorb lithium ions for the negative electrode, and a non-protonic organic electrolyte solution of lithium salt for the electrolyte. This lithium-ion capacitor has an energy density of more than 10wh / kg. However, compared with lithium-ion batteries, the energy density of lithium-ion capacitors is still much lower. Lithium-ion batteries are widely used as power sources for power battery vehicles because their energy density can reach 200-300wh / kg.

[0003] With the continuous development of lithium-ion battery technology, the energy density has been further improved, and all-solid-state lithium batteries have been developed that use solid electrolytes instead of liquid electrolytes in traditional lithium-ion batteries, with an energy density of more than 300wh / kg. In the process of improving the energy density of energy storage devices, in addition to continuous innovation in the chemical system, while keeping the material system unchanged, improving the energy density of energy storage devices by continuously increasing the volume or weight occupied by active substances in the energy storage device has always been a direction of effort in the commercialization of energy storage devices. Summary of the invention

[0004] The purpose of the present invention is to provide an electrochemical energy storage device, aiming to solve the problems of low active material ratio and low energy density caused by the structural limitations of existing energy storage devices.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: an electrochemical energy storage device, including an inner layer separator, a plurality of negative electrode sheets, a plurality of positive electrode sheets, a conductive negative electrode lead structure for connecting each of the negative electrode sheets, and a conductive positive electrode lead structure for connecting each of the positive electrode sheets, wherein the inner layer separator is continuously bent in a vertical direction to form a plurality of first accommodating cavities for accommodating the negative electrode sheets and a plurality of second accommodating cavities for accommodating the positive electrode sheets, each of the first accommodating cavities having a first opening, a second opening and a third opening connected in sequence. Opening, each of the second accommodating cavities has a fourth opening, a fifth opening and a sixth opening which are connected in sequence, the opening direction of the first opening is the same as the opening direction of the fourth opening, the opening direction of the second opening is opposite to the opening direction of the fifth opening, the opening direction of the third opening is the same as the opening direction of the sixth opening, the negative lead structure is arranged at the end side of the second opening of each of the first accommodating cavities and is connected to each of the negative electrode sheets, and the positive lead structure is arranged at the end side of the fifth opening of each of the second accommodating cavities and is connected to each of the positive electrode sheets.

[0006] Specifically, each of the negative electrode plates includes a negative electrode current collector and a negative electrode coating sandwiched on opposite sides of the negative electrode current collector, the end surface of each of the negative electrode current collectors facing the corresponding second opening is flush with the end surface of the corresponding first accommodating cavity at the second opening, and each of the negative electrode current collectors abuts against the negative electrode lead structure.

[0007] Specifically, each of the positive electrode plates includes a positive current collector and a positive electrode coating sandwiched on opposite sides of the positive current collector, the end face of each of the positive current collectors facing the corresponding fifth opening is flush with the end face of the corresponding second accommodating cavity at the fifth opening, and each of the positive current collectors abuts against the positive lead structure.

[0008] Alternatively, each of the negative electrode sheets includes a negative electrode current collector and a negative electrode coating sandwiched between opposite sides of the negative electrode current collector, each of the negative electrode current collector protrudes to the outside toward the second opening, and each of the negative electrode current collector abuts against the negative electrode lead structure.

[0009] Alternatively, each of the positive electrode sheets includes a positive current collector and a positive electrode coating sandwiched between opposite sides of the positive current collector, each of the positive current collector protrudes to the outside toward the fifth opening, and each of the positive current collectors abuts against the positive lead structure.

[0010] Preferably, the length of the negative electrode current collector extending to the outside of the second opening is in the range of 0.1 mm to 1.0 mm.

[0011] Preferably, the length of the positive electrode current collector extending to the outside of the fifth opening is in the range of 0.1 mm to 1.0 mm.

[0012] Specifically, the negative electrode lead structure is a first conductive film layer provided on the second opening end side of each first accommodating cavity.

[0013] Specifically, the positive electrode lead structure is a first conductive film layer provided on the second opening end side of each first accommodating cavity.

[0014] Beneficial effects of the present invention: The electrochemical energy storage device provided by the present invention, first, continuously bends the inner isolation membrane in the vertical direction to form a plurality of first accommodating cavities and a plurality of second accommodating cavities that are alternately arranged, thereby increasing the accommodating space of each positive electrode sheet and each negative electrode sheet under the same volume, and the volume utilization rate is high, that is, the volume ratio of the active material is increased, and the volume energy density is higher; secondly, the end side of each negative electrode sheet facing the second opening corresponding to the first accommodating cavity is directly connected to the negative electrode lead structure, eliminating the negative electrode ear structure, and under the same volume, more space is reserved to increase the volume proportion of the active material of each negative electrode sheet. Similarly, the end side of each positive electrode sheet facing the fifth opening corresponding to the second accommodating cavity is directly connected to the positive electrode lead structure, and the positive electrode ear structure is also omitted. Under the same volume, more space is reserved to increase the volume proportion of the active material of each positive electrode sheet. The electrochemical energy storage device of the present invention adopts a "de-eared" structure based on a spatial multi-layer folding structure, and provides leads to each negative electrode plate and each positive electrode plate, so that the active material in the energy storage device accounts for a higher proportion and the energy density is higher.

[0015] The present invention also provides a method for manufacturing the chemical energy storage device described above, and the manufacturing method is as follows:

[0016] The inner isolation film is continuously bent in a vertical direction to form a plurality of first accommodating cavities and a plurality of second accommodating cavities which are alternately arranged;

[0017] Punching out a plurality of rectangular negative electrode sheets and a plurality of rectangular positive electrode sheets, placing each negative electrode sheet in a corresponding first accommodation cavity, placing each positive electrode sheet in a corresponding second accommodation cavity, and hot pressing to form a stacked structure cube;

[0018] The circumference of the stacked structure cube has a first end side where the negative pole pieces and the positive pole pieces face outward in the same direction, a second end side where only the negative pole pieces face outward, a third end side where the negative pole pieces and the positive pole pieces face outward in the same direction and opposite to the first end side, and a fourth end side where only the positive pole pieces face outward and opposite to the second end side. The second end side of the stacked structure cube is metallized to connect the negative pole pieces in series, and the fourth end side of the stacked structure cube is metallized to connect the positive pole pieces in series.

[0019] Beneficial effects of the present invention: The manufacturing method of the electrochemical energy storage device provided by the present invention has a higher utilization rate of materials such as the inner isolation membrane, and ensures a higher proportion of active substances in the energy storage device and a higher energy density. At the same time, the use of tab materials is reduced, the process is simpler, and the manufacturing cost is lower. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0021] Figure 1 An exploded diagram of an electrochemical energy storage device provided in Embodiment 1 of the present invention;

[0022] Figure 2 A schematic diagram of the structure of an inner isolation membrane of an electrochemical energy storage device provided in Embodiment 1 of the present invention;

[0023] Figure 3 A cross-sectional view of an electrochemical energy storage device provided in Embodiment 1 of the present invention;

[0024] Figure 4 This is a schematic diagram of the structure of the electrochemical energy storage device provided in Example 1 of the present invention.

[0025] Figure 5 This is a cross-sectional view of the electrochemical energy storage device provided in Example 2 of the present invention.

[0026] Among them, the reference numerals in the figure are:

[0027]

[0028] DETAILED DESCRIPTION

[0029] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0030] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are 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 on the present invention.

[0031] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0032] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] Embodiment 1

[0034] Please refer to Figure 1 and Figure 2The electrochemical energy storage device provided by the embodiment of the present invention includes an inner separator 10, a plurality of negative electrode sheets 20, a plurality of positive electrode sheets 30, a conductive negative electrode lead structure 40 for connecting the negative electrode sheets 20, and a conductive positive electrode lead structure 50 for connecting the positive electrode sheets 30. The inner separator 10 is continuously bent in the vertical direction to form a plurality of first accommodating cavities 11 for accommodating the negative electrode sheets 20 and a plurality of second accommodating cavities 12 for accommodating the positive electrode sheets 30, which are alternately arranged. It can be understood that the inner separator 10 is bent and folded multiple times in the vertical space to form accommodating cavities that wrap the negative electrode sheets 20 and the positive electrode sheets 30, that is, it is a connected "Z" shape when viewed from the side of the inner separator 10. Each first accommodation cavity 11 has a first opening 11a, a second opening 11b and a third opening 11c which are connected in sequence. Here, it can be understood that each first accommodation cavity 11 is closed in only one direction in the circumferential direction, and the other three directions are open. Each second accommodation cavity 12 has a fourth opening 12a, a fifth opening 12b and a sixth opening 12c which are connected in sequence. Similarly, each second accommodation cavity 12 is closed in only one direction in the circumferential direction, and the other three directions are open. The opening direction of the first opening 11a is the same as the opening direction of the fourth opening 12a, the opening direction of the second opening 11b is opposite to the opening direction of the fifth opening 12b, the opening direction of the third opening 11c is the same as the opening direction of the sixth opening 12c, the negative lead structure 40 is arranged at the end side of the second opening 11b of each first accommodating cavity 11 and is connected to each negative electrode sheet 20, and the positive lead structure 50 is arranged at the end side of the fifth opening 12b of each second accommodating cavity 12 and is connected to each positive electrode sheet 30.

[0035] The electrochemical energy storage device provided by the embodiment of the present invention, firstly, the inner isolation film 10 is continuously bent in the vertical direction to form a plurality of first accommodating cavities 11 and a plurality of second accommodating cavities 12 that are alternately arranged, thereby increasing the accommodating space of each positive electrode sheet 30 and each negative electrode sheet 20 under the same volume, and the volume utilization rate is high, that is, the volume ratio of the active material is increased, and the volume energy density is higher; secondly, the end side of each negative electrode sheet 20 facing the second opening 11b corresponding to the first accommodating cavity 11 is directly connected to the negative electrode lead structure 40, and the negative electrode ear ear structure is omitted. Under the same volume, more space is reserved to increase the volume ratio of the active material of each negative electrode sheet 20. Similarly, the end side of each positive electrode sheet 20 facing the fifth opening 12b corresponding to the second accommodating cavity 12 is directly connected to the positive electrode lead structure 50, and the positive electrode ear structure is also omitted. Under the same volume, more space is reserved to increase the volume ratio of the active material of each positive electrode sheet 30. The electrochemical energy storage device of the present invention adopts a "de-eared" structure based on a spatial multi-layer folding structure, and leads each negative electrode plate 20 and each positive electrode plate 30 outward, so that the active material in the energy storage device accounts for a higher proportion and the energy density is higher.

[0036] Specifically, please refer to Figures 1 to 3 In this embodiment, each negative electrode sheet 20 includes a negative electrode current collector 21 and a negative electrode coating 22 sandwiched between opposite sides of the negative electrode current collector 21. It can be understood that the negative electrode sheet 21 is a layered structure and is punched into a rectangular shape. The end face of each negative electrode current collector 22 facing the corresponding second opening 11b is flush with the end face at the second opening 11b of the corresponding first accommodating cavity 11, and each negative electrode current collector 21 abuts against the negative electrode lead structure 40. Here, it can be understood that the end side of each negative electrode current collector 21 for leading outward faces the same direction and is flush with the end face at the second opening 11b of the first accommodating cavity 11. In this way, when the conductive negative electrode lead structure 40 is set at the end side of each second opening 11b, each negative electrode sheet 20 is connected.

[0037] Similarly, please refer to Figures 1 to 3 In this embodiment, each positive electrode sheet 30 includes a positive electrode current collector 31 and a positive electrode coating 32 sandwiched between opposite sides of the positive electrode current collector 31. It can be understood that the positive electrode sheet 31 is a layered structure and is punched into a rectangular shape. The end face of each positive electrode current collector 32 facing the corresponding fifth opening 12b is flush with the end face of the corresponding second accommodating cavity 12 at the fifth opening 12b, and each positive electrode current collector 31 abuts against the positive electrode lead structure 50. Similarly, the end side of each positive electrode current collector 31 for leading outward faces the same direction and is flush with the end face of the fifth opening 12b of the second accommodating cavity 12. In this way, when the conductive positive electrode lead structure 50 is set at the end side of each fifth opening 12b, each positive electrode sheet 30 is connected.

[0038] Specifically, in the present embodiment, the negative lead structure 40 is a first conductive film layer provided at the end side of the second opening 12b of each first accommodating cavity 11. Here, the negative lead structure 40 is a conductive layer abstracted for ease of understanding. The area size of the first conductive film layer is not limited, and it can cover the entire lead end side of each negative electrode sheet 20, or only cover a part, so as to achieve connection of each negative current collector 21. Of course, in addition to existing in the structural form of a conductive film layer, the negative lead structure 40 can also be a conductive strip structure or a conductive belt structure.

[0039] Similarly, in the present embodiment, the positive lead structure 50 is a second conductive film layer provided at the end side of the fifth opening 12b of each second accommodating cavity 12. Here, the positive lead structure 50 is a conductive layer abstracted for ease of understanding. There is no limitation on the area of ​​the second conductive film layer, which can cover the entire lead end side of each positive electrode sheet 30, or only part of it, so as to achieve connection of each positive current collector 31. Of course, in addition to existing in the form of a conductive film layer structure, the positive lead structure 50 can also be a conductive strip structure or a conductive belt structure.

[0040] Preferably, in this embodiment, the negative lead structure 40 and the positive lead structure 50 can be conductive slurry coatings applied or sprayed on the lead ends of each negative current collector and each positive current collector. For example, the negative lead structure 40 is a conductive silver slurry coating, a conductive copper slurry coating, a conductive nickel slurry coating, and a carbon slurry coating, and the positive lead structure 50 is a conductive aluminum slurry coating.

[0041] Alternatively, in this embodiment, the negative electrode lead structure 40 and the positive electrode lead structure 50 may be conductive coatings plated on the lead ends of each negative electrode current collector and each positive electrode current collector. For example, the negative electrode lead structure 40 is a conductive copper coating, a conductive nickel coating, and the positive electrode lead structure 50 is a conductive aluminum coating. Specifically, this may be achieved by vacuum evaporation of a metal thin film layer.

[0042] Preferably, in this embodiment, the thickness of the negative electrode sheet 20 is in the range of 50 μm to 200 μm.

[0043] Preferably, in this embodiment, the thickness of the positive electrode sheet 30 is in the range of 50 μm to 200 μm.

[0044] Preferably, in this embodiment, the thickness of the inner isolation film 10 is in the range of 10 μm to 30 μm.

[0045] For further information, please refer to Figure 2 and Figure 4In this embodiment, the electrochemical energy storage device further includes an outer isolation film 60, which is wrapped around the outer side of the inner isolation film 10, that is, the first opening 11a and the third opening 11c of each first accommodating cavity 11 and the fourth opening 12a and the sixth opening 12c of each second accommodating cavity 12 are blocked. That is, the non-lead end of each positive electrode current collector is prevented from short-circuiting with the non-lead end of each negative electrode current collector.

[0046] In this embodiment, the material of the positive electrode current collector 31 is any one of aluminum foil, stainless steel foil, graphite paper, carbon nanotube film, metallized PP film, metallized PE film, and metallized PET film. The material of the negative electrode current collector 21 is any one of copper foil, stainless steel foil, graphite paper, carbon nanotube film, metallized PP film, metallized PE film, and metallized PET film.

[0047] In this embodiment, the material of the inner isolation membrane 10 is a polyolefin porous film, a composite membrane composed of a non-woven polymer porous membrane coated with a metal oxide particle insulation material coating and a sticky polymer coating, and a flexible inorganic electrolyte composite membrane.

[0048] Preferably, the inner isolation film 10 is composed of a PE or PP isolation film and a double-sided coated Al 2 O 3 The composite film consists of a particle coating and a PVDF adhesive coating.

[0049] Preferably, the inner separator 10 is a polymer having ion conductivity such as polyethylene oxide, polyethylene glycol, polyetherimide, and their derivative copolymers.

[0050] Preferably, the inner isolation membrane 10 is a flexible inorganic electrolyte composite membrane, such as a flexible electrolyte composite membrane made of a sulfur-based glass solid electrolyte or a metal oxide solid electrolyte mixed with a polymer electrolyte and other polymer binders.

[0051] Embodiment 2

[0052] Please refer to Figure 2 and Figure 5 , which is different from the above embodiment in that the negative electrode current collector 21 protrudes toward the second opening 11b to the outside, and each negative electrode current collector 21 abuts against the negative electrode lead structure 40. It can be understood that the length of the negative electrode current collector 21 is greater than the depth of the first accommodating cavity 11. This structure is suitable for negative electrode current collectors 21 with better cross-sectional conductivity.

[0053] Similarly, the positive current collector 31 protrudes toward the fifth opening 12b to the outside, and each positive current collector 31 abuts against the positive lead structure 50. It can be understood that the length of the positive current collector 21 is greater than the depth of the second accommodating cavity 11. Similarly, this structure is suitable for positive current collectors 31 with better cross-sectional conductivity.

[0054] Preferably, in this embodiment, the length of the negative electrode current collector 21 extending to the outside of the second opening 11 b ranges from 0.1 mm to 1.0 mm.

[0055] Preferably, in this embodiment, the length of the positive electrode current collector 31 extending to the outside of the fifth opening 12 b ranges from 0.1 mm to 1.0 mm.

[0056] The embodiment of the present invention also provides a method for manufacturing the above-mentioned chemical energy storage device, and the manufacturing method is as follows:

[0057] Step 1: continuously bend the inner isolation film along the vertical direction to form a plurality of first accommodating cavities and a plurality of second accommodating cavities that are alternately arranged;

[0058] Here, the inner isolation membrane is folded in the vertical space, that is, it is a connected "Z" shape when viewed from the side of the inner isolation membrane. In this way, the spatial regional distribution is guaranteed, with better space utilization and ensuring that each negative electrode plate is separated from each positive electrode plate.

[0059] Step 2: punching out a plurality of rectangular negative electrode sheets and a plurality of rectangular positive electrode sheets, placing each negative electrode sheet in a corresponding first accommodation cavity, placing each positive electrode sheet in a corresponding second accommodation cavity, and hot pressing to form a stacked structure cube;

[0060] Here, the inner surfaces of each first accommodating cavity and each second accommodating cavity are sticky. Under heating and pressurizing conditions, the front and back surfaces of each negative electrode sheet are adhered in the corresponding first accommodating cavity and the front and back surfaces of each positive electrode sheet are adhered in the corresponding second accommodating cavity, finally forming a compact stacked structure cube.

[0061] Step three, the circumference of the stacked structure cube has a first end side in which the negative pole pieces and the positive pole pieces face outward in the same direction, a second end side in which only the negative pole pieces face outward, a third end side in which the negative pole pieces and the positive pole pieces face outward in the same direction and opposite to the first end side, and a fourth end side in which only the positive pole pieces face outward and opposite to the second end side. The second end side of the stacked structure cube is metallized to connect the negative pole pieces in series, and the fourth end side of the stacked structure cube is metallized to connect the positive pole pieces in series.

[0062] Here, the lead-out direction of the lead ends of each negative electrode sheet is the same and perpendicular to the folding direction of the inner isolation film. Similarly, the lead-out direction of the lead ends of each positive electrode sheet is the same and perpendicular to the folding direction of the inner isolation film, and at the same time, opposite to the lead-out direction of the lead ends of each negative electrode sheet.

[0063] The metallization treatment specifically includes forming a negative electrode conductive layer for connecting each negative electrode sheet on the second end side of the stacked structure cube, and forming a positive electrode conductive layer for connecting each positive electrode sheet on the fourth end side of the stacked structure cube. Preferably, the metallization treatment is a conductive paste coating on the second end side of the stacked structure cube and on the fourth end side of the stacked structure cube by coating or spraying, for example, the negative electrode conductive layer is a conductive silver paste coating, a conductive copper paste coating, a conductive nickel paste coating, a carbon paste coating, etc., and the positive electrode conductive layer is a conductive aluminum paste coating.

[0064] Alternatively, the metallization treatment is a conductive coating on the second end side of the stacked structure cube and on the fourth end side of the stacked structure cube. For example, the negative electrode conductive layer is a conductive copper coating layer, a conductive chromium coating layer, a conductive nickel coating layer, and the positive electrode conductive layer is a conductive aluminum coating layer. Specifically, it can be achieved by vacuum evaporation of a metal thin film layer process.

[0065] The manufacturing method of the electrochemical energy storage device provided by the embodiment of the present invention has a higher utilization rate of materials such as the inner isolation membrane, and ensures a higher proportion of active substances in the energy storage device and a higher energy density. At the same time, the use of tab materials is reduced, the process is simpler, and the manufacturing cost is lower.

[0066] Specifically, the electrochemical energy storage device includes a supercapacitor, a lithium-ion supercapacitor, a PET composite substrate lithium-ion battery, a graphite paper composite substrate lithium-ion battery, and a solid electrolyte metal lithium battery. The manufacturing process of each electrochemical energy storage device is as follows:

[0067] Supercapacitors

[0068] 90 parts by weight of commercially available activated carbon powder, 5 parts by weight of acetylene black powder, 5 parts by weight of polyvinylidene fluoride powder and 100 parts by weight of N-methylpyrrolidone were fully mixed to obtain the electrode slurry. The electrode slurry was evenly coated on both sides of the 15μm aluminum foil current collector using a coating machine, and then dried and stamped to obtain an electrode electrode with a thickness of 60μm. The electrode electrode was punched into 6.0×7.5cm 2The small pieces are set aside for use. The inner insulating film is made of a cellulose / rayon mixed non-woven fabric with a thickness of 35μm and a polyvinylidene fluoride adhesive layer on the surface. Before use, it is cut into long strips of insulating film tape with a width of 6.5cm. The electrode pieces and the inner insulating film tape are alternately stacked in a Z shape. The inner insulating film wraps the short side of one side of the electrode piece, and the long side of the electrode piece is consistent with the length direction of the insulating film. Then the sides where the two long sides of the electrode piece are located and the upper and lower surfaces of the laminated structure are wrapped with the inner insulating film. After the electrode pieces are stacked, they are hot-pressed to bond each layer of the electrode piece to the insulating film. Then the thermosetting conductive silver paste is brushed on both sides of the short side of the laminated structure after hot pressing. After low-temperature curing, the leads of the capacitor are soldered on the conductive layers on both sides by soldering. After shelling, electrolyte filling and packaging, the double-layer capacitor can be made.

[0069] Lithium-ion supercapacitors

[0070] 85 parts by weight of commercially available activated carbon powder, 5 parts by weight of acetylene black powder, 6 parts by weight of acrylic resin adhesive, 4 parts by weight of sodium carboxymethyl cellulose and 200 parts by weight of deionized water were fully mixed to obtain a positive electrode slurry. The positive electrode slurry was evenly coated on both sides of the 15μm aluminum foil of the positive electrode current collector by a roller coater. After drying and rolling, a positive electrode sheet with a thickness of 120μm was obtained. The positive electrode sheet was punched into 6.0×7.5cm 2 Small pieces for later use.

[0071] Dissolve 10 parts by weight of commercially available polyvinylidene fluoride powder in 90 parts by weight of N-methylpyrrolidone to obtain a 10% concentration polyvinylidene fluoride solution, then add 100 parts by weight of commercially available hard carbon powder to the above polyvinylidene fluoride solution and mix thoroughly to obtain a negative electrode slurry. Use a roller coater to evenly coat the negative electrode slurry on both sides of the 10μm copper foil of the negative electrode current collector. Then, after drying and rolling, a negative electrode sheet with a thickness of 60μm is obtained. Punch the electrode sheet into 6.0×7.5cm 2 Small pieces for later use.

[0072] The inner isolation film adopts a polyolefin porous PP isolation film with a thickness of 25μm and a polyvinylidene fluoride adhesive layer on the surface. Before use, it is cut into long strips of isolation film strips with a width of 6.5cm. The positive and negative electrode pieces are alternately stacked with the isolation film strips in a Z shape. The isolation film wraps the short side of one side of the pole piece, and the long side of the pole piece is consistent with the length direction of the isolation film. Then the two long sides of the pole piece and the upper and lower surfaces of the stacked structure are wrapped with isolation film. After the pole pieces are stacked, they are hot pressed to bond each layer of the pole piece to the isolation film. Then the thermosetting conductive silver paste is brushed on both sides of the short side of the hot-pressed stacked structure. After low-temperature curing, the leads of the capacitor are soldered on the conductive layers on both sides. After shelling, electrolyte filling and packaging, the double-layer capacitor can be made.

[0073] PET composite substrate lithium ion battery

[0074] (1) Production of positive electrode:

[0075] The positive electrode active material nickel cobalt manganese 811, the conductive agent carbon black, and the binder polyvinylidene fluoride are mixed in a mass ratio of 96:2:2, and the solvent N-methylpyrrolidone is added, and stirred with a blender to form a uniform and stable positive electrode slurry; the positive electrode slurry is evenly coated on the positive electrode current collector PET aluminum-plated composite substrate, and after drying, the positive electrode pole piece is obtained by rolling, slitting, and film cutting, and a positive electrode connection portion with a length of 0.1-0.5mm exceeding the PET aluminum-plated composite substrate is reserved on one side of the positive electrode pole piece.

[0076] (2) Production of negative electrode sheet:

[0077] The negative electrode active material graphite, the conductive agent acetylene black, the thickener carboxymethyl cellulose, and the binder styrene butadiene rubber are mixed in a mass ratio of 96.5:0.5:1.5:1.5, and the solvent deionized water is added, and the mixture is stirred in a blender to obtain a uniform and stable negative electrode slurry; the negative electrode slurry is evenly coated on the negative electrode current collector PET copper-plated composite substrate, and after drying, the negative electrode pole piece is obtained by rolling, slitting, and film cutting, and a negative electrode connection portion with a length of 0.1-0.5 mm exceeding the PET copper-plated composite substrate is reserved on one side of the negative electrode pole piece.

[0078] (3) Preparation of inner isolation film

[0079] Select a polyethylene porous membrane and coat the surface with Al 2 O 3 The composite film of the particle coating and the polyvinylidene fluoride adhesive coating is used as a separation film and is cut into corresponding widths according to the designed size for standby use.

[0080] (4) Preparation of electrolyte

[0081] Ethylene carbonate, ethyl methyl carbonate and diethyl carbonate were mixed in a volume ratio of 1:1:1 to obtain an organic solvent, and then the fully dried lithium salt LiPF 6 Dissolve in the mixed solvent to prepare an electrolyte with a concentration of 1 mol / L.

[0082] (5) Preparation of bare lithium-ion battery cells

[0083] The positive electrode sheet, inner layer isolation film, and negative electrode sheet are stacked in a Z-shaped stacking manner, so that the isolation film is between the positive and negative electrode sheets to play an isolating role. After the stacking is completed, avoid the side that needs metallization treatment to lead out the positive and negative electrode connection parts, and wrap the remaining four sides with an outer layer of isolation film and fix them with adhesive tape to obtain a bare battery cell. The moisture content of the bare battery cell is baked in a vacuum oven to within the specification range for use. (6) Production of battery cell tab lead structure

[0084] After wrapping, the bare cell has two opposite sides that are not wrapped. One side exposes the positive electrode connection of the PET aluminum-plated composite substrate with all positive electrode pieces, and the other side exposes the positive electrode connection of the PET copper-plated composite substrate with all negative electrode pieces. Using the metal cold spraying process, a 0.5mm thick metal aluminum layer is sprayed on the positive electrode connection side, and a 0.5mm thick metal copper layer is sprayed on the positive electrode connection side. After cleaning, the positive and negative external leads of the cell are welded to the surface of the aluminum spray layer and the copper spray layer by soldering, and a layer of hot-melt silicone is coated on the welding point to prevent the electrolyte from penetrating.

[0085] The lithium-ion battery is manufactured after the above battery cells are shelled, filled with electrolyte, packaged, and subjected to formation tests.

[0086] Graphite paper composite substrate lithium ion battery

[0087] (1) Production of positive electrode:

[0088] The positive electrode active material nickel cobalt manganese 811, the conductive agent carbon black, and the binder polyvinylidene fluoride are mixed in a mass ratio of 96:2:2, and a volume of N-methylpyrrolidone is added, and stirred with a blender to form a uniform and stable positive electrode slurry; the positive electrode slurry is evenly coated on the positive electrode current collector graphite paper composite substrate, and after drying, the positive electrode sheet is obtained by rolling, slitting, and film cutting.

[0089] (2) Production of negative electrode sheet:

[0090] The negative electrode active material graphite, the conductive agent acetylene black, the thickener carboxymethyl cellulose, and the binder styrene butadiene rubber are mixed in a mass ratio of 96.5:0.5:1.5:1.5, and the solvent deionized water is added, and the mixture is stirred in a blender to obtain a uniform and stable negative electrode slurry; the negative electrode slurry is evenly coated on the negative electrode current collector graphite paper composite substrate, and after drying, the negative electrode sheet is obtained by rolling, slitting, and film cutting.

[0091] (3) Preparation of inner isolation film

[0092] Select a polyethylene porous membrane and coat the surface with Al 2 O 3 The composite film of the particle coating and the polyvinylidene fluoride adhesive coating is used as a separation film and is cut into corresponding widths according to the designed size for standby use.

[0093] (4) Preparation of electrolyte

[0094] Ethylene carbonate, ethyl methyl carbonate and diethyl carbonate were mixed in a volume ratio of 1:1:1 to obtain an organic solvent, and then the fully dried lithium salt LiPF 6 Dissolve in the mixed solvent to prepare an electrolyte with a concentration of 1 mol / L.

[0095] (5) Preparation of bare lithium-ion battery cells

[0096] The positive electrode sheet, inner isolation film and negative electrode sheet are stacked in a Z-shaped stacking manner, so that the isolation film is placed between the positive and negative electrode sheets to play an isolating role. After the stacking is completed, avoid the side that needs metallization treatment to lead out the negative wire of the pole ear, and wrap the other four sides with an outer isolation film and fix them with adhesive tape to obtain a bare battery cell, and bake the moisture content of the bare battery cell in a vacuum oven to within the specification range for use.

[0097] (6) Production of battery cell lead structure

[0098] After wrapping, the bare cell has two opposite sides that are not wrapped. One side exposes the graphite paper composite substrate section of all positive pole pieces, and the other side exposes the graphite paper composite substrate section of all negative pole pieces. Using the metal spraying process, a 0.5mm thick metal aluminum layer is sprayed on each positive pole piece side, and a 0.5mm thick metal copper layer is sprayed on each negative pole piece side. After cleaning, the positive and negative external leads of the cell are welded to the surface of the sprayed aluminum layer and the sprayed copper layer by soldering, and a layer of hot-melt silicone is coated on the welding point to prevent the electrolyte from penetrating.

[0099] The lithium-ion battery is manufactured after the above battery cells are shelled, filled with electrolyte, packaged, and subjected to formation tests.

[0100] Solid electrolyte lithium metal battery

[0101] (1) Production of positive electrode:

[0102] 88 wt% of positive electrode material LiFePO4, 2.0 wt% of conductive carbon black and 10.0 wt% of binder polyethylene oxide were added to N-methyl-2-pyrrolidone as a solvent to prepare a positive electrode slurry. The positive electrode slurry was evenly coated on a positive electrode current collector aluminum foil with a thickness of 16 μm and dried to obtain a positive electrode. Then, the positive electrode sheet was obtained through rolling, slitting and film cutting.

[0103] (2) Production of negative electrode sheet:

[0104] The metal lithium film negative electrode can be purchased directly or made by extrusion. The surface is treated by chemical formation to form a surface protection layer. The negative electrode lithium film is cut into negative electrode sheets.

[0105] (3) Preparation of inner isolation film

[0106] 72 wt % of polyethylene oxide, 20 wt % of LiTFSI lithium salt, and 8 wt % of γ-alumina with a median particle size of 200 nm were selected and extruded and cast into a 20 μm thick polymer inner layer isolation membrane using a twin-screw extruder.

[0107] (4) Preparation of bare lithium-ion battery cells

[0108] The positive electrode sheet, inner isolation film and negative electrode sheet are stacked in a Z-shaped stacking manner, so that the inner isolation film is placed between the positive and negative electrode sheets to play an isolating role. After the stacking is completed, it is wrapped with an outer isolation film and fixed with adhesive tape to obtain a bare battery cell, and the moisture content of the bare battery cell is baked in a vacuum oven to within the specification range for use.

[0109] (5) Production of battery cell lead structure

[0110] After wrapping, the bare cell has two opposite sides that are not wrapped. One side exposes the aluminum foil substrate section of all positive electrode plates, and the other side exposes the metal lithium section of all negative electrode plates. Using the metal spraying process, a 0.5mm thick metal aluminum layer is sprayed on the positive side, and a 0.5mm thick metal copper layer is sprayed on the negative side. After cleaning, the positive and negative external leads of the cell are welded to the surface of the aluminum spray layer and the copper spray layer by soldering, and a layer of hot-melt silicone is coated on the welding point to prevent the electrolyte from penetrating.

[0111] After the above battery cells are shelled, packaged, and formed and tested, a solid electrolyte metal lithium battery is obtained.

[0112] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for manufacturing an electrochemical energy storage device, characterized in that: The electrochemical energy storage device comprises an inner layer separator, a plurality of negative electrode sheets, a plurality of positive electrode sheets, a conductive negative electrode lead structure for connecting the negative electrode sheets, and a conductive positive electrode lead structure for connecting the positive electrode sheets. The inner layer separator is continuously bent in a vertical direction to form a plurality of first accommodating cavities for accommodating the negative electrode sheets and a plurality of second accommodating cavities for accommodating the positive electrode sheets, which are alternately arranged. Each of the first accommodating cavities has a first opening, a second opening and a third opening which are connected in sequence, and each of the second accommodating cavities has a first opening, a second opening and a third opening which are connected in sequence. The fourth opening, the fifth opening and the sixth opening, the opening direction of the first opening is the same as the opening direction of the fourth opening, the opening direction of the second opening is opposite to the opening direction of the fifth opening, the opening direction of the third opening is the same as the opening direction of the sixth opening, the negative lead structure is provided at the end side of the second opening of each of the first accommodating cavities and connected to each of the negative electrode sheets, the positive lead structure is provided at the end side of the fifth opening of each of the second accommodating cavities and connected to each of the positive electrode sheets, and the manufacturing method of the electrochemical energy storage device is as follows: The inner isolation film is continuously bent in a vertical direction to form a plurality of first accommodating cavities and a plurality of second accommodating cavities which are alternately arranged; Punching out a plurality of rectangular negative electrode sheets and a plurality of rectangular positive electrode sheets, placing each negative electrode sheet in a corresponding first accommodation cavity, placing each positive electrode sheet in a corresponding second accommodation cavity, and hot pressing to form a stacked structure cube; The circumference of the stacked structure cube has a first end side where the negative pole pieces and the positive pole pieces face outward in the same direction, a second end side where only the negative pole pieces face outward, a third end side where the negative pole pieces and the positive pole pieces face outward in the same direction and opposite to the first end side, and a fourth end side where only the positive pole pieces face outward and opposite to the second end side. The second end side of the stacked structure cube is metallized to connect the negative pole pieces in series, and the fourth end side of the stacked structure cube is metallized to connect the positive pole pieces in series.

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