Integrated cell layer production system

Abstract

The utility model discloses an integrated cell layer production system which is provided with two pole piece conveying paths for conveying a positive pole piece and a negative pole piece respectively, the two pole piece conveying paths are combined after being pressed by a pressing device, and a coating device is arranged at the upstream of the pressing device. The coating device comprises a first coating assembly for coating one side of one pole piece with electrolyte slurry, a drying device is further arranged at the downstream of the coating device, the pressing device is arranged in the drying device, the two pole pieces coated with the electrolyte slurry enter the drying device to be dried, and the pole pieces with composite electrolyte layers are obtained. Then the two composite pole pieces converge at a pressing device located in the drying device, and an integrated battery core layer is obtained through pressing; according to the scheme, the compounding of the electrolyte layer and the pole piece and the compounding of the positive pole piece and the negative pole piece can be realized in one step, and compared with a step-by-step production process, the production efficiency and the product consistency are higher.

Description

Technical Field

[0001] The utility model belongs to the technical field of coating equipment, and specifically relates to an integrated battery core layer production system. Background Art

[0002] Solid electrolytes are safer than liquid electrolytes, but the solid-solid interface between the solid electrolyte and the electrode has poor wettability, which directly affects the performance of the solid-state battery. In addition, the electrolyte layer is made separately and then composited, which greatly prolongs the production process and reduces the product yield.

[0003] In order to solve the problem of solid-solid interface wettability, the existing technology adopts the method of pressurizing the battery during the battery cell formation stage to physically promote interface contact, which improves the interface wettability to a certain extent; in addition, the existing technology also records that solid electrolytes are compounded on the surface of the positive electrode plate and the negative electrode plate to form a composite electrode with a surface composite solid electrolyte layer. During assembly, the solid electrolyte layers of the composite electrode plate are made to fit together, and the interface problem between the solid electrolyte and the electrode plate is converted into an interface problem between the solid electrolytes, which is also beneficial to the improvement of the interface wettability of the solid-state battery; however, the above scheme still adopts a step-by-step preparation process, and the generation of the electrolyte layer and the assembly process of the positive and negative electrodes are carried out step by step, with poor continuity. In addition, in the step-by-step preparation process, in order to ensure the continuity between different steps, there are often a large number of repetitive operations in the production process, the process takes longer, further reduces the yield, and significantly increases the production cost, which is not conducive to large-scale production.

[0004] In view of this, the present utility model is proposed. Utility Model Content

[0005] The technical problem to be solved by the present invention is to solve one of the problems in the above-mentioned prior art, and to provide an integrated battery core layer production system, which completes the generation of the electrolyte layer on the surface of the electrode and the composite of the positive electrode, negative electrode and electrolyte layer in one step, shortens the process time, improves production efficiency, and the obtained products have higher consistency and stability.

[0006] In order to achieve the above-mentioned purpose, the utility model provides an integrated battery core layer production system, which has two electrode sheet conveying paths for conveying positive electrode sheets and negative electrode sheets respectively, and the two electrode sheet conveying paths merge with each other after passing through a pressing device;

[0007] It also includes a coating device located upstream of the pressing device along the pole piece conveying path, with a gap between the coating device and the pressing device (6) for coating the electrolyte slurry on the surface of the pole piece passing through the coating device along the pole piece conveying path.

[0008] In the above scheme, the formation of the electrolyte layer and the composite of the positive and negative electrode sheets and the electrolyte layer are integrated into one step, which significantly improves the continuity and improves the preparation efficiency; and the formation of the electrolyte layer and the composite of the positive and negative electrode sheets are completed in one step, which greatly reduces the intervention of factors affecting product performance in the preparation process and improves the performance and consistency of the integrated battery core layer.

[0009] Furthermore, the coating device includes a first coating assembly located upstream of the pressing device along the electrode conveying path, and the first coating assembly is used to coat the electrolyte slurry on one side surface of the electrode from one electrode conveying path.

[0010] Furthermore, the coating device further includes a second coating assembly located upstream of the pressing device along the electrode conveying path, the second coating assembly being used to coat the electrolyte slurry on one side surface of the electrode from another electrode conveying path;

[0011] When pressed by the pressing device, the electrolyte layers on the two electrode sheets are against each other; or, the electrode sheets and the electrolyte layers are alternately stacked.

[0012] Since the materials and compositions of the active substances on the electrolyte layer and the electrode surface are different, defects and damage are more likely to occur during pressing. In the above scheme, the electrolyte layers on the two electrode sheets are offset against each other during pressing, and the contact between the electrode sheets and the electrolyte layers is converted into contact between the electrolyte layers, which can better avoid the occurrence of defects and damage and ensure the quality stability of the product; the overlapping arrangement of the electrode sheets and the electrolyte layers fully takes into account the subsequent use requirements of the prepared battery core layers. When stacking or winding, there is no need to add an additional electrolyte layer, which simplifies subsequent operations and avoids the impact of adding a separate electrolyte layer on the consistency of the final battery product.

[0013] Furthermore, when pressed together, the electrolyte layers on the two electrode sheets are offset against each other, and the integrated battery core layer production system also includes a third coating component, which is arranged on the other side of the electrode sheet opposite to the second coating component, and is used to coat the electrolyte slurry on the surface of the other side of the electrode sheet.

[0014] The above solution coats the electrolyte slurry on both sides of the electrode through the cooperation of the second coating component and the third coating component, which can avoid defects and damage while facilitating subsequent steps and improving product consistency.

[0015] Furthermore, the integrated battery core layer production system also includes a drying device, which is located downstream of the coating device along the electrode conveying path and is used to dry the electrolyte slurry.

[0016] Furthermore, the drying device has two drying areas for drying the two electrode sheets respectively, wherein at least one of the drying areas has staggered air flotation rollers.

[0017] In the above scheme, the electrode sheets coated with electrolyte slurry on both sides can be sent to the drying area where the air flotation roller is set, so that the electrode sheets can be dried without contacting the roller body. Air flotation rollers can also be set in both drying areas. On the one hand, the contact between the electrode sheets and the roller body is avoided, and the thickness consistency of the electrode sheets is improved; on the other hand, since the electrode sheets do not contact the roller body, no additional stress will be generated due to friction.

[0018] Furthermore, the pressing device is arranged in the drying device and is located at the tail section of the drying device along the electrode conveying path.

[0019] In the above scheme, the pressing device is arranged at the tail section of the drying device. On the one hand, it ensures that the electrolyte layer on the surface of the electrode is fully solidified, reducing the solvent content in the electrolyte layer when entering the pressing device; on the other hand, the drying device is used to heat the electrode to achieve full contact between the electrolyte layer and the electrode and / or electrolyte layer, thereby improving the wetting effect of the contact interface after pressing.

[0020] As an alternative to the above solution, the pressing device is located downstream of the drying device along the electrode sheet conveying direction, and the pressing device further includes a heater for heating the electrode sheet entering the pressing device.

[0021] Furthermore, it also includes a thickness adjustment device, which is located downstream of the coating device and the drying device along the electrode conveying path and is used to adjust the thickness of the electrolyte slurry coated on the surface of the electrode.

[0022] In the above solution, the thickness of the electrolyte slurry is controlled by the thickness adjustment device, which further improves the thickness consistency of the electrode sheet after the composite electrolyte layer, thereby improving the consistency of the integrated battery core layer.

[0023] Furthermore, the pressing device also includes a pair of rollers, and a gap is formed between the pair of rollers to press the positive electrode plate, the electrolyte layer and the negative electrode plate to form an integrated battery cell; the gap between the pair of rollers is adjustable; by adjusting the gap between the pair of rollers and controlling the thickness of the electrolyte slurry, integrated battery cells with different electrolyte layer thicknesses can be produced according to actual needs.

[0024] After adopting the above technical solution, the utility model has the following beneficial effects compared with the prior art.

[0025] 1. The integrated battery cell layer production system combines the composite functions of the electrolyte layer and the electrode, as well as the composite functions of the positive electrode, electrolyte layer and negative electrode, to achieve one-step continuous preparation of the integrated battery cell layer, shortening the preparation process, improving the yield, and achieving higher product consistency compared to step-by-step preparation.

[0026] 2. The pressing device is arranged inside the drying device, so that after the two electrode sheets are dried, the pressing is completed inside the drying device, and the temperature of the drying device is used to achieve full contact of the solid-solid interface; and the above scheme realizes full utilization of the heat in the drying device, improves the energy utilization rate of the integrated battery cell layer production system, and achieves the purpose of energy saving and high efficiency.

[0027] 3. According to actual production needs, the first coating component, the second coating component, and the third coating component can be used to coat the electrolyte layer on the surface of one electrode respectively or on the surface of two electrodes at the same time, which meets the needs of flexible production. When the first coating component, the second coating component, and the third coating component are all coated, the solid-solid interface of the two electrodes is changed from the interface between the electrolyte layer and the electrode to the interface between the electrolyte layers, which improves the consistency and performance stability of the integrated battery layer; the obtained integrated battery layer includes a positive electrode sheet, an electrolyte layer, a negative electrode sheet, and an electrolyte layer stacked in sequence. During subsequent winding or stacking, there is no need to form a new electrolyte layer, which improves the consistency of the obtained battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the first structure of the integrated battery core layer production system described in Example 1;

[0029] Figure 2 This is a schematic diagram of the second structure of the integrated battery core layer production system described in Example 1;

[0030] Figure 3 It is a structural schematic diagram of the integrated battery core layer production system described in Example 2;

[0031] Figure 4 This is a schematic diagram of the first structure of the integrated battery core layer production system described in Example 3;

[0032] Figure 5 This is a first perspective schematic diagram of the integrated battery core layer production system described in Example 3;

[0033] Figure 6 This is a second structural schematic diagram of the integrated battery core layer production system described in Example 3;

[0034] Figure 7 This is a second perspective schematic diagram of the integrated battery core layer production system described in Example 3.

[0035] In the figure: 1. Electrode conveying path; 2. First coating assembly; 3. Second coating assembly; 4. Third coating assembly; 5. Drying device; 6. Laminating device; 7. Unwinding device; 8. Rewinding device; 9. Storage tank. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0037] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0038] In the description of this utility model, it should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; and direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0039] The utility model provides an integrated battery core layer production system, which has two electrode sheet conveying paths 1 for conveying positive electrode sheets and negative electrode sheets respectively. The two electrode sheet conveying paths 1 pass through a pressing device 6 and then merge with each other.

[0040] A coating device is also provided upstream of the pressing device 6 along the electrode conveying path 1, and a gap is provided between the coating device and the pressing device (6), for coating the surface of the electrode passing through the coating device along the electrode conveying path with an electrolyte slurry; and then the electrolyte slurry is solidified to form an electrolyte layer, and when pressed by the pressing device 6, the electrolyte layer contacts another electrode, forming an integrated battery core layer in which the positive electrode, the solid electrolyte layer, and the negative electrode are stacked in sequence.

[0041] like Figures 1 to 7 As shown, the two electrode conveying paths 1 start with the unwinding device 7 and end with the winding device 8. A pressing device 6 is provided on the electrode conveying path 1. After passing through the pressing device 6, the two electrode conveying paths 1 merge with each other. In other embodiments of the present invention, the starting point and end point of the electrode conveying path 1 may not be the unwinding device 7 and the winding device 8. For example, the starting point may also be the outlet of the electrode coating equipment or the electrode drying equipment; the end point may also be the entrance of the stacking device or the winding device.

[0042] Through the integrated battery cell layer production system, the originally independent electrolyte layer preparation and the composite of positive and negative electrodes are integrated into one step, which improves the continuity of battery cell layer production and avoids a large number of repetitive operations done to improve the continuity between different steps during step-by-step preparation, thereby improving preparation efficiency and reducing production costs; and greatly reduces the intervention of factors affecting product performance during the preparation process, thereby improving the performance and consistency of the integrated battery cell layer.

[0043] In addition, a deviation correction device (not shown in the figure) and a tension control device (not shown in the figure) are provided upstream of the pressing device 6, which further improves the consistency and performance stability of the integrated battery core layer.

[0044] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0045] Example 1

[0046] As an embodiment of the present invention, this embodiment provides an integrated battery core layer production system, which is specifically described as follows.

[0047] In this embodiment, if Figure 1 As shown, the two electrode sheet conveying paths 1 start from the unwinding device 7 and end at the rewinding device 8, and are formed by several conveying rollers between the unwinding device 7 and the rewinding device 8. The electrode sheets released by the unwinding device 7 are led out by the guide rollers and are respectively conveyed to the front side of the laminating device 6 by two rows of conveying rollers parallel to each other.

[0048] The coating device includes a first coating component 2, which coats the electrolyte slurry on the surface of the electrode of a electrode conveying path 1 located below. In order to ensure the smooth progress of the composite, the first coating component 2 coats the electrolyte slurry on the upper surface of the electrode. During pressing, one side of the coated electrolyte slurry can contact the electrode of another electrode conveying path 1 from above to achieve smooth pressing; in order to achieve the solidification of the electrolyte slurry during the conveying process of the conveying roller, the first coating component 2 is arranged upstream of the conveying roller, extending the length of the electrode conveying path 1 from the coating of the electrolyte slurry to the entry into the pressing device 6, which is conducive to the full solidification of the electrolyte slurry.

[0049] In order to further provide sufficient drying time for the electrolyte slurry, in this embodiment, the electrode conveying path 1 located below includes 7 conveying rollers arranged side by side, and the 7 conveying rollers are arranged at intervals, which increases the interval between the first coating component 2 and the pressing device 6, and further extends the length from the coating of the electrolyte slurry to the entry into the pressing device 6, which can better achieve the solidification of the electrolyte slurry; in order to improve the solidification effect of the electrolyte slurry, in other embodiments, the 7 conveying rollers can also be arranged along an arc; in other embodiments, the number of conveying rollers can be increased or decreased according to actual conditions, or the conveying rollers can be replaced with conveyor belts.

[0050] In order to speed up this process and shorten the production cycle, in other embodiments, a vacuum device can also be set downstream of the first coating component 2. The vacuum device wraps the conveying roller inside to form a vacuum section on the electrode conveying path 1. Under the influence of the vacuum, the volatilization rate of the solvent in the electrolyte slurry is increased, thereby improving production efficiency; alternatively, a fan can also be set in the conveying roller section to accelerate the air flow rate around the electrode conveying path 1 located below by the fan to promote the volatilization of the solvent.

[0051] Taking into account that the solvent in the electrolyte slurry may not be fully volatilized, the pressing device 6 also includes a heater (not shown in the figure), which heats the electrode entering the pressing device 6. On the one hand, heating promotes the volatilization of the solvent in the electrolyte layer and improves the curing degree of the electrolyte layer. On the other hand, heating promotes full contact between the electrolyte layer and the electrode, improves the wetting effect of the contact interface after pressing, and thus the integrated battery core layer obtained meets the high quality and high consistency requirements; in this embodiment, the heater is set as two parallel heating plates located in the pressing device 6 in front of the roller, and the electrode sheets from the two electrode conveying paths 1 are guided by the conveying rollers and then merged into the corresponding area of ​​the heating plate, or are close to each other and fitted under the guidance of the conveying rollers in the area corresponding to the heating plate; in other embodiments, the heater can also be set to other common forms, and can also be set to directly heat the rollers.

[0052] In order to further control the thickness consistency of the electrolyte layer, a thickness adjustment device is also provided in this embodiment. The thickness adjustment device is a scraper (not shown in the figure) that forms a dimensionally stable gap with the electrode conveying path 1. The scraper can more accurately control the thickness of the electrolyte layer, so that the thickness change ratio between the stacked structure of the positive electrode sheet, the electrolyte layer and the negative electrode sheet before pressing and the integrated battery core layer after pressing remains stable, further improving the consistency of the integrated battery core layer; the gap between the scraper and the electrode conveying path 1 can be adjusted, and the thickness of the electrolyte layer can be adjusted according to actual production needs, thereby improving the versatility of the integrated battery core layer production system.

[0053] Furthermore, the coating device has a storage tank 9 for storing electrolyte slurry, and the first coating component 2 is connected to the storage tank 9 through a pipeline, and the electrolyte slurry in the storage tank 9 is coated on the surface of the electrode; for ease of control, a flow control valve (not shown in the figure) for controlling the flow of the electrolyte slurry is also provided on the first coating component 2, and the thickness of the coated electrolyte layer can be controlled by the flow control valve; as other embodiments of the present invention, the storage tank 9 can also be set as a material trough or other container capable of storing electrolyte slurry, or a device for preparing electrolyte slurry can be assembled in the storage tank 9 to simultaneously realize the preparation and storage of electrolyte slurry; the flow control valve can also be replaced by a variable frequency delivery pump, or other device capable of realizing flow control; in this embodiment, the storage tank 9 is arranged on one side of the unwinding device 7 located below, and in order to realize the smooth coating of the electrolyte slurry, a pumping device is also provided on the pipeline. In other embodiments, the storage tank 9 can also be set at a position higher than the first coating component 2, and there is no need to set a pumping device.

[0054] The electrode sheet compounded with the electrolyte layer is merged with the electrode sheet from another electrode sheet conveying path 1 at the pressing device 6. The two electrode sheets are compounded into one by pressing the pressing device 6 to form an integrated battery core layer in which the positive electrode sheet, the electrolyte layer, and the negative electrode sheet are stacked in sequence. In this embodiment, the pressing device 6 is provided with a pair of rollers, and the pair of rollers can be relatively displaced along the direction of the roller axis to adjust the gap between the two rollers.

[0055] In other embodiments, the structure of the integrated battery core layer production system is as follows: Figure 2 As shown, the electrode from the lower electrode conveying path 1 passes through the first coating component 2, the electrolyte slurry is attached to the surface, and then the thickness of the electrolyte slurry is adjusted by the rollers, and then solidified. Thereafter, it is merged with the electrode from the upper electrode conveying path 1, and after being pressed by the pressing device 6, it is rolled up to obtain an integrated battery cell layer in which the positive electrode, electrolyte layer, and negative electrode are stacked in sequence.

[0056] In addition, the electrode from the electrode conveying path 1 above can also be a composite electrode with an electrolyte layer attached in advance, so that there is no need to form an additional electrolyte layer during subsequent use.

[0057] Example 2

[0058] As another embodiment of the present invention, this embodiment further makes the following improvements on the basis of the first embodiment.

[0059] In this embodiment, the coating device further includes a second coating assembly 3 , which coats the electrolyte slurry onto the surface of the electrode in the electrode conveying path 1 located above.

[0060] Specifically, such as Figure 3As shown, the second coating component 3 is coated upstream of the conveying roller that forms the upper electrode conveying path 1, so that the electrolyte slurry coated on the surface of the upper electrode can also have sufficient time to solidify; the second coating component 3 and the first coating component 2 both coat the electrolyte slurry on the upper surface of the electrode, forming an integrated battery cell in which the positive electrode sheet, the electrolyte layer, the negative electrode sheet, and the electrolyte layer are stacked in sequence during pressing; in this way, no additional electrolyte layer needs to be formed in the subsequent stacking or winding to form the battery cell, thereby improving the convenience of subsequent battery cell production and the consistency of the obtained battery cell; or in other embodiments, the electrolyte slurries formed on the two electrode sheets by the first coating component 2 and the second coating component 3 respectively can also be located on opposite sides of the two electrode sheets, that is, the electrolyte layers located on the two electrode sheets are offset from each other during pressing.

[0061] Since the solid-solid interface wettability between the electrolyte layers is relatively higher, for this purpose, the coating device also includes a third coating component 4, which coats the electrolyte slurry on the other side of the electrode from the upper electrode conveying path 1 through the third coating component 4. After drying, electrolyte layers are formed on both side surfaces of the electrode from the upper electrode conveying path 1, respectively. Then, when pressed together, the electrolyte layers between the two electrode sheets are in contact, and the wettability is better, thereby improving the performance of the integrated battery core layer.

[0062] Specifically, in order to achieve coating on both sides of the electrode by the second coating component 3 and the third coating component 4, the upper electrode conveying path 1 is formed into an "S" shape through three rows of conveying rollers arranged horizontally at intervals. The electrolyte slurry coated by the second coating component 3 is initially solidified in the section from the completion of coating to the first bend. After passing the first bend, it turns downward and contacts the second row of conveying rollers, exposing the uncoated side. Since the electrolyte slurry has been initially solidified into an electrolyte layer, contact with the conveying rollers at this time will not affect the uniformity of the electrolyte layer; when conveyed to the second bend by the second row of conveying rollers, the slurry is coated on the uncoated side by the third coating component 4, and then conveyed to the pressing device 6 by the third row of conveying rollers after the second turn.

[0063] In this process, in order to avoid the electrolyte layer coated by the third coating component 4 from contacting the third row of conveying rollers, the third row of conveying rollers can be set as air-floating rollers. While smoothly conveying the electrode, it effectively avoids contact between the electrode and the roller body, thereby ensuring the stability of the slurry thickness.

[0064] In addition, in this embodiment, the first coating component 2, the second coating component 3 and the third coating component 4 are connected to the same storage tank 9, and a flow control valve is also provided on the pipeline connecting the second coating component 3, the third coating component 4 and the storage tank 9. In other embodiments, the first coating component 2, the second coating component 3 and the third coating component 4 can also be connected to different storage tanks 9 respectively.

[0065] Example 3

[0066] As another embodiment of the present invention, this embodiment differs from the first embodiment in that the method of accelerating the volatilization speed of the solvent in the electrolyte slurry and the structure of the pressing device 6 are different.

[0067] In this embodiment, if Figure 4 As shown, a drying device 5 is provided downstream of the coating device, and the electrode conveying path 1 passes through the interior of the drying device 5; specifically, the drying device 5 has a drying chamber, and a plurality of rollers are provided in the chamber, and the electrode is guided by the rollers to move along the drying path set in the drying device 5; the drying path defined by the rollers can be adjusted according to actual use requirements. In this embodiment, two rows of rollers are provided along the length direction of the drying device 5, and the two rows of rollers are located at different heights and staggered, respectively guiding the two electrode sheets to be dried from different paths in the drying device 5; in other embodiments, in order to extend the drying path, the guide rollers can also be arranged to form drying paths of other shapes, for example, they can be set to "V" shape, "concave" shape, "convex" shape, "L" shape, and other drying paths commonly used in the field that can extend the drying time.

[0068] Further, such as Figure 5 As shown, in this embodiment, the pressing device 6 is arranged in the chamber of the drying device 5. Specifically, the pair of rollers of the pressing device 6 is arranged in the drying chamber near the outlet of the drying device 5, that is, regardless of whether the two pole pieces are coated with electrolyte slurry, they must be heated by the drying device 5, and finally pressed into one in the pressing device 6 located at the tail of the drying device 5; this arrangement does not require a separate heater to be set in the pressing device 6, simplifies the structure of the integrated battery layer production system, and promotes full adhesion of the solid-solid interface during pressing through the heat provided by the drying device 5, thereby realizing full utilization of the heat of the drying device 5 and improving energy utilization efficiency.

[0069] In order to avoid the premature merging of the two electrode sheets in the drying device 5 and to avoid the mutual influence between the two electrode sheets during the drying process, two drying areas are set in the drying chamber (such as Figure 5 The two electrode conveying paths 1 pass through different drying areas respectively, and after leaving the corresponding drying areas, they are gathered together and enter the pressing device 6. In order to avoid the two drying areas from affecting each other, the two drying areas can also be separated by setting a partition plate.

[0070] In order to further improve the consistency of the integrated battery core layer, the roller in the drying device 5 is set as an air flotation roller. While smoothly drying the electrolyte slurry, it can effectively avoid contact between the electrode and the roller. The thickness of the electrolyte slurry will not change due to contact with the roller surface.

[0071] It should also be noted that the drying device 5 in this embodiment can also be used in the integrated battery core layer production system described in Example 2. Figure 6 and Figure 7 As shown, since the second coating component 3 and the third coating component 4 need to coat the electrolyte slurry on both sides of the electrode respectively, in order to complete the drying in a limited area, multiple rows of rollers are set in one of the drying areas to form an "S"-shaped drying path. As the electrode moves back and forth in the drying area, the electrolyte slurry coated by the second coating component 3 is dried, and the other side of the uncoated electrode is exposed, and then the third coating component 4 is coated again. After coating, the electrode continues to move along the drying path to dry the electrolyte slurry coated by the third coating component 4. Finally, the two electrode sheets converge at the pressing device 6 and are pressed into one to obtain an integrated battery core layer.

[0072] Since the second coating component 3 and the third coating component 4 perform coating in sequence, the drying time of the electrode is greatly extended. In order to ensure that the speeds of the two electrode sheets moving along the electrode sheet conveying path 1 are similar or even the same, a "V"-shaped drying path is formed in the drying area corresponding to the electrode coated by the first coating component 2, so as to avoid the inconsistent conveying speeds of the two electrode sheets and the inability to press them together smoothly, thereby further improving the consistency and quality stability of the integrated battery cell layer.

[0073] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any technician familiar with this patent can make some changes or modifications to equivalent embodiments with equivalent changes using the above-mentioned technical contents without departing from the scope of the technical solution of the present invention. The implementation schemes in the above embodiments can also be further combined or replaced. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the solution of the present invention.

Claims

1. An integrated battery core layer production system, characterized in that: There are two electrode sheet conveying paths (1) for conveying positive electrode sheets and negative electrode sheets respectively, and the two electrode sheet conveying paths (1) merge with each other after passing through a pressing device (6); The invention also includes a coating device located upstream of the pressing device (6) along the electrode conveying path (1), with a gap between the coating device and the pressing device (6) for coating the electrolyte slurry on the surface of the electrode passing through the coating device along the electrode conveying path.

2. The integrated battery core layer production system according to claim 1, characterized in that: The coating device comprises a first coating assembly (2) located upstream of a pressing device (6) along a pole piece conveying path (1), and the first coating assembly (2) is used for coating electrolyte slurry on one side surface of a pole piece from one pole piece conveying path (1).

3. The integrated battery core layer production system according to claim 2, characterized in that: The coating device further comprises a second coating assembly (3) located upstream of the pressing device (6) along the electrode conveying path (1), the second coating assembly (3) being used to coat the electrolyte slurry on one side surface of the electrode from another electrode conveying path (1); When pressed by the pressing device (6), the electrolyte layers on the two pole pieces are pressed against each other; or, the pole pieces and the electrolyte layers are alternately stacked.

4. The integrated battery core layer production system according to claim 3, characterized in that: During the pressing process, the electrolyte layers on the two electrode sheets are pressed against each other. The integrated battery core layer production system further comprises a third coating component (4). The third coating component (4) is arranged on the other side of the electrode sheet opposite to the second coating component (3) and is used to coat the electrolyte slurry on the surface of the other side of the electrode sheet.

5. The integrated battery core layer production system according to claim 1, characterized in that: It also includes a drying device (5), which is located downstream of the coating device along the electrode conveying path (1) and is used to dry the electrolyte slurry.

6. The integrated battery core layer production system according to claim 5, characterized in that: The drying device (5) is provided with two drying areas for drying the two electrode sheets respectively, wherein at least one of the drying areas is provided with staggered air flotation rollers.

7. The integrated battery core layer production system according to claim 5, characterized in that: The pressing device (6) is arranged in the drying device (5) and is located at the tail section of the drying device (5) along the electrode conveying path (1).

8. The integrated battery core layer production system according to claim 5, characterized in that: The pressing device (6) is located downstream of the drying device (5) along the electrode conveying direction. The pressing device (6) also includes a heater for heating the electrode entering the pressing device (6).

9. The integrated battery core layer production system according to any one of claims 1 to 8, characterized in that: It also includes a thickness regulating device, which is located downstream of the coating device and the drying device along the electrode conveying path (1) and is used to regulate the thickness of the electrolyte slurry coated on the surface of the electrode.

10. The integrated battery core layer production system according to any one of claims 1 to 8, characterized in that: The pressing device (6) also includes a pair of rollers, and a gap is formed between the pair of rollers to press the positive electrode sheet, the electrolyte layer and the negative electrode sheet to form an integrated battery cell; the gap between the pair of rollers is adjustable.

Images