Battery pole piece processing device and method

Abstract

The present application provides a battery electrode processing device and method. The battery electrode processing device includes: a coating mechanism for coating and baking the battery electrode, and a rolling mechanism for rolling the coated and baked battery electrode. The rolling mechanism is installed in a sealed box, and the sealed box and the coating mechanism are separated by a baffle made of a heat-conductive material. The baffle has a gap between the sealed box and the coating mechanism to allow the battery electrode to pass from the coating mechanism through the baffle into the sealed box. The present application integrates the coating and rolling processes, utilizing the heat released during coating to complete the hot pressing work, reducing the cost of battery cell production and simplifying the complexity of the hot pressing operation.

Description

Technical Field

[0001] The present application relates to the field of lithium-ion battery manufacturing, and in particular to a device and method for processing pole pieces of lithium-ion battery cells. Background Art

[0002] During the production of lithium-ion batteries, after coating and baking, the active material in the battery pole piece is relatively loose, resulting in a very low peel strength with the current collector. Therefore, it needs to be rolled to enhance the bonding strength between the active material and the current collector. In addition, the compaction density of the pole piece has a significant impact on the electrochemical performance of the battery. Within a certain range, as the compaction density increases, the distance between the active material particles decreases, the contact area between the particles increases, and the number of pathways and bridges for ion conduction increases, thereby reducing the internal resistance of the battery. In addition, rolling the pole piece can compress the volume of the battery cell and increase the energy density of the battery cell. Rolling in production is divided into cold pressing and hot pressing. Hot pressing has the following advantages over cold pressing: 1. The residual elastic deformation of the pole piece after rolling is small, which is reflected in the reduced thickness rebound of the pole piece; 2. It removes moisture from the pole piece; 3. It increases the adhesion between the active material and the fluid.

[0003] Hot rolling (pressing) is currently widely used abroad for electrode sheet production, while cold rolling is still the most common method in China. In actual production applications and in some patents, hot pressing methods generally heat the rollers or the electrode sheets during the rolling process to achieve the purpose of hot pressing. However, this method requires a separate heat source, which increases battery production costs and is not conducive to manual on-site operation. Summary of the Invention

[0004] The technical problem to be solved by the present application is that the hot pressing method of battery pole pieces requires heating the rollers separately or heating the pole pieces, which increases the production cost and complexity.

[0005] In order to solve the above technical problems, the present application discloses a processing device for battery pole pieces, comprising: a coating mechanism for coating and baking the battery pole pieces and a rolling mechanism for rolling the coated and baked battery pole pieces; wherein, the rolling mechanism is installed in a sealed box, and the sealing box and the coating mechanism are separated by a baffle, and the baffle is made of heat-conductive material; the baffle has a gap between the sealing box and the coating mechanism, so that the battery pole pieces can pass through the baffle from the coating mechanism into the sealing box.

[0006] Optionally, the height of the gap is 20 mm to 100 mm.

[0007] Optionally, the rolling mechanism includes a smooth roller and an embossing roller, wherein the distance between the smooth roller and the baffle is smaller than the distance between the embossing roller and the baffle.

[0008] Optionally, the distance between the smooth roller and the baffle is 0.2m to 4m.

[0009] Optionally, the printing depth of the embossing roller is less than or equal to 2 mm.

[0010] Optionally, the printing of the embossing roller is parallel stripes, and the spacing between the stripes is less than or equal to 1 mm.

[0011] Optionally, the battery electrode processing device further includes a control mechanism disposed outside the sealing box, for controlling the rolling mechanism to adjust the compaction density of the battery electrode.

[0012] Optionally, the battery pole piece processing device further includes a surface density measuring mechanism disposed outside the sealing box, for measuring the surface density of the battery pole piece after rolling and feeding back the measurement to the coating mechanism.

[0013] In order to solve the above technical problems, the present application discloses a processing method for battery electrodes suitable for the above processing device, including: a conveying mechanism conveys the battery electrodes to the coating mechanism; the coating mechanism coats and bakes the battery electrodes; the conveying mechanism conveys the coated and baked battery electrodes from the coating mechanism through the gap to the rolling mechanism; the rolling mechanism rolls the coated and baked battery electrodes.

[0014] Optionally, the coating mechanism is a coating oven, and the processing method further includes: setting the temperature in the coating oven so that the direction in which the battery electrode is conveyed by the conveying mechanism is from low to high and then from high to low.

[0015] Optionally, the temperature in the coating oven is 60°C to 150°C, and the temperature of the oven portion close to the baffle is 80°C to 100°C.

[0016] Compared with the existing technology, the technical solution of this application has at least the following beneficial effects:

[0017] By connecting the coating mechanism and the sealing box equipped with the rolling mechanism together through a heat-conducting baffle, the coating process and the rolling process can be integrated. After coating, the plate can be rolled directly. The heat released by the coating and drying is transferred by the heat-conducting baffle, so that the temperature of the electrode after coating can be maintained in the sealing box. Therefore, there is no need to provide an additional heat source to complete the hot pressing work, thereby saving energy, simplifying the complexity of the hot pressing operation, reducing the cost of battery cell production, and improving the efficiency of battery cell production.

[0018] The double rolling process using a smooth roller and an embossing roller can make the compaction density of the battery electrode more stable. In addition, the second rolling process is completed by the embossing roller, which not only realizes the embossing function, but also avoids roller sticking (powder on the electrode sticking to the roller). At the same time, the electrode printing can improve the electrolyte wettability and liquid retention of the electrode, thereby improving the battery performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0020] Figure 1 This is a schematic structural diagram of a battery electrode processing device according to an embodiment of the present application.

[0021] The following is a supplementary description of the accompanying drawings:

[0022] 1, 1′, 1″ - battery pole piece; 2 - coating mechanism; 21, 22, 23 - parts of the coating oven; 3 - rolling mechanism; 30 - sealing box; 31 - smoothing roller; 32 - embossing roller; 4 - baffle; 40 - gap; 5 - control mechanism; 6 - surface density measurement mechanism; 7 - conveying mechanism. DETAILED DESCRIPTION

[0023] The following will be combined with the accompanying drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection of this application.

[0024] In the description of the present application, it should be understood that the terms "upper", "lower", "top", "bottom", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present application. 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of such features. Moreover, the terms "first", "second", etc. are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0025] The technical solution of this application connects the coating mechanism and the sealed box equipped with the rolling mechanism through a heat-conducting baffle, thereby integrating the coating process with the rolling process. The heat released during coating is transferred by the heat-conducting baffle to complete the hot pressing work, thereby reducing the production cost of the battery cell and simplifying the complexity of the hot pressing operation. The technical solution of this application is described in detail below with reference to the accompanying drawings and examples.

[0026] Please refer to Figure 1 As shown, the processing device of the battery electrode of the embodiment of the present application includes a coating mechanism 2 for coating and baking the battery electrode 1′ and a rolling mechanism 3 for rolling the coated and baked battery electrode 1″; wherein, the rolling mechanism 3 is installed in a sealing box 30, and the sealing box 30 is separated from the coating mechanism 2 by a baffle 4, and the baffle 4 is made of heat-conducting material; the baffle 4 has a gap 40 between the sealing box 30 and the coating mechanism 2, so that the battery electrode 1 passes through the baffle 4 from the coating mechanism 2 and enters the sealing box 30 (please refer to the battery electrodes 1′, 1, 1″ in the figure for the direction of the battery electrodes).

[0027] The height h of the gap 40 is set according to the thickness of the battery electrode 1, and is generally slightly higher than the thickness of the battery electrode 1. In the embodiment of the present application, the height h of the gap 40 can range from 20 mm to 100 mm.

[0028] The baffle 4 can be made of stainless steel, or other heat-conducting materials, such as metals such as nickel alloys and aluminum alloys, or non-metals such as ceramics and glass. The function of the baffle 4 is to increase the heat preservation of the coating mechanism (for example, a coating oven) 2, so that the coated electrode is easier to dry. If the baffle 4 is not provided, the temperature in the coating mechanism 2 will dissipate to the rolling area, and the efficiency of the coating mechanism 2 will be greatly reduced, while also increasing energy consumption. On the other hand, the heat of the coating mechanism 2 can be transferred to the rolling sealing box 30 through the baffle 4, so that the electrode is subjected to a certain temperature environment during hot pressing, which is conducive to maintaining a higher temperature for the electrode.

[0029] After the battery electrode 1 passes through the baffle 4, it can be rolled once or multiple times to achieve a battery electrode with a stable compaction density that meets the manufacturing requirements. In the embodiment of the present application, the battery electrode 1 can be rolled twice. Specifically, the rolling mechanism 3 can include two rolling rollers, namely a smooth roller 31 and an embossing roller 32, wherein the distance between the smooth roller 31 and the baffle 4 is smaller than the distance between the embossing roller 32 and the baffle 4, that is, the smooth roller 31 is close to the coating mechanism 2 and the baffle 4, and the embossing roller 32 is away from the coating mechanism 2 and the baffle 4. The distance d between the smooth roller 31 and the baffle 4 can range from 0.2m to 2m. Generally speaking, the distance between the rolling roller close to the baffle 4, that is, the smooth roller 31 and the baffle 4 should be as close as possible, so that the temperature loss of the electrode during rolling will be less. In fact, it is also necessary to consider the temperature loss of the electrode and the inherent installation distance of the two devices (there may need to be a space for a deviation corrector for the electrode belt in front of the rolling roller. The deviation corrector is used to prevent the electrode from directional deviation during rolling, resulting in electrode defects and uneven winding after rolling. Therefore, the distance between the smooth roller 31 and the baffle 4 needs to be farther; if the shaking problem can be controlled, there is no need for a deviation corrector, and the distance between the smooth roller 31 and the baffle 4 can be set to 0.2m. In addition, there is no special requirement for the distance between the smooth roller 31 and the embossing roller 32. Considering the actual site and equipment limitations, the distance between the smooth roller 31 and the embossing roller 32 can be set to 0.2m~3m.

[0030] After the battery electrode 1 enters the sealing box 30, it is first rolled by the smooth roller 31 to obtain an electrode with a certain compaction density. It is then rolled by the embossing roller 32 to obtain an electrode with a stable compaction density and a printed surface. The printing of the embossing roller 32 can be designed according to actual needs. For example, it can be parallel stripes with a spacing of less than or equal to 1 mm and a printing depth of less than or equal to 2 mm.

[0031] Furthermore, to achieve automated control of the production process, a control mechanism 5 and an areal density measuring mechanism 6 may be provided outside the sealing box 30. The control mechanism 5 is used to control the rolling mechanism 3 to adjust the compaction density of the battery electrode sheet; the areal density measuring mechanism 6 is used to measure the areal density of the battery electrode sheet after rolling and provide feedback to the coating mechanism 2.

[0032] Specifically, the control mechanism 5 includes a control panel, through which the rolling parameters in the hot pressing process can be set. The control mechanism 5 is connected to the smooth roller 31 and the embossing roller 32 of the rolling mechanism 3, and can control the smooth roller 31 and the embossing roller 32 to adjust their respective rolling parameters to obtain the required compaction density when rolling the battery electrode. After rolling, the battery electrode is transported outside the sealing box 30. The surface density measurement mechanism 6 measures the surface density of the battery electrode to obtain the uniformity information of the battery electrode coating. The surface density measurement mechanism 6 feeds back the coating uniformity information to the coating mechanism 2 connected thereto. The coating mechanism 2 adjusts the coating and baking parameters in the coating process based on the fed-back coating uniformity information to obtain the required coating uniformity when coating the battery electrode.

[0033] Please continue to refer to Figure 1 Based on the above-mentioned processing device, the processing method of the battery electrode of the embodiment of the present application includes:

[0034] The conveying mechanism 7 conveys the battery electrode 1 ′ to the coating mechanism 2;

[0035] The coating mechanism 2 coats and bakes the battery electrode 1';

[0036] The conveying mechanism 7 conveys the coated and baked battery electrode 1 from the coating mechanism 2 to the rolling mechanism 3 through the gap 40;

[0037] The rolling mechanism 3 rolls the coated and baked battery pole piece 1 ″.

[0038] In an embodiment of the present application, the coating mechanism 2 may be a coating oven 2, and the processing method may further include: setting the temperature in the coating oven 2 so that the direction in which the conveying mechanism 7 conveys the battery electrode sheet is from low to high and then from high to low.

[0039] The interior of the coating oven 2 can be divided into multiple sections along the direction of the battery electrode (the direction in which the conveying mechanism 7 conveys the battery electrode), and the temperature of each section can vary, specifically changing from low to high and then from high to low along the direction of the battery electrode. For example, the coating oven 2 can be divided into an oven section 21 away from the baffle 4, an oven middle section 22, and an oven section 23 near the baffle 4; during coating and baking, the temperature of the oven section 21 away from the baffle 4 is set to be lower than the temperature of the oven middle section 22, and the temperature of the oven section 23 near the baffle 4 is also lower than the temperature of the oven middle section 22. The temperature of the oven section 21 away from the baffle 4 and the temperature of the oven section 23 near the baffle 4 can be the same or different. The temperature in the coating oven 2 is set in sections mainly to prevent the adhesive from floating up during the drying process. The control of the coating oven 2 can select a three-section, four-section or even multi-section temperature gradient distribution: generally, the front section is low temperature to prevent the sprayed electrode from entering the high-temperature zone and causing defects caused by too fast drying; the middle section is a high-temperature interval. For example, in this interval, polyvinylidene fluoride (PVDF) has a high degree of crystallinity and good adhesion, which has a positive effect on the internal resistance and cycle performance of the manufactured battery; the third section lowers the temperature to a lower temperature to prevent the electrode with an excessively high temperature from shrinking suddenly after being cooled, causing coating defects.

[0040] In a specific implementation, the temperature in the coating oven 2 can be set in the range of 60°C to 150°C, and the temperature of the last part of the coating oven 2, i.e., the oven part 23 close to the baffle 4, can be 80°C to 100°C. Accordingly, the battery electrode 1 directly enters the rolling mechanism 3 in the sealing box 30 after coating and drying. At this time, the temperature of the battery electrode 1" can reach 60°C to 80°C. Suitable oven temperatures and segmented temperature zones can be set for different active substances and binder materials. If the temperature is too high, the binder structure changes, resulting in binder failure and material falling off; if the temperature is too low, the electrode is not dry, and the active material will stick to the roller during rolling, resulting in electrode defects. In addition, the coating and baking temperatures of the positive and negative electrodes are different. Because the binders and solutions are different, the baking temperature of the negative electrode is generally lower than that of the positive electrode.

[0041] The following is combined with Figure 1 The specific implementation process of the processing method of the battery pole piece of the present application is further described with specific examples. Those skilled in the art can understand that the specific implementation of the processing method of the battery pole piece is not limited to the following examples.

[0042] Example 1

[0043] Battery electrodes are transported by a conveyor mechanism (e.g., a conveyor belt) 7 into the coating oven 2, passing through a baffle 4 and into a sealing box 30. The rolling mechanism 3 is installed within the sealing box 30, which is connected to the coating oven 2 via a baffle 4, a thin stainless steel plate. A gap 40 is left below the baffle 4, allowing the battery electrodes 1 to pass from the coating oven 2 through the baffle 4 and onto the smoothing roller 31. The gap height h is 50 mm. The coating oven 2 consists of multiple sections 21, 22, and 23. The oven temperature is set from low to high and then from high to low, in the direction of the battery electrode feed. That is, the temperature of the coating oven section 21 is lower than that of the middle section 22, which is higher than that of the coating oven section 23. The temperature within the coating oven 2 is maintained between 90°C and 120°C, with the temperature of the last section 23 of the coating oven 2 being 90°C.

[0044] The rolling mechanism 3 includes two rolling machines, and the two rolling machines are in the same sealed box 30. The dried battery pole piece directly enters the rolling machine, and the temperature of the battery pole piece 1″ is 65°C at this time. Among the two rolling machines, the rolling roller of the rolling machine close to the coating oven 2 is a smooth roller 31, and the rolling roller of the rolling machine away from the coating oven 2 is an embossing roller 32. The distance d between the baffle 4 and the smooth roller 31 is 2.0m. The battery pole piece 1″ first enters the smooth roller 31 to obtain a battery pole piece with a certain compaction density; and then enters the embossing roller 32 to obtain a battery pole piece with a stable compaction density and a printing on the surface. The printing depth of the embossing roller 32 is 0.8mm, and the embossing roller printing is parallel to each other in stripes with a stripe spacing of 0.7mm.

[0045] The two rollers can be controlled separately by a control mechanism 5, whose control panel is located outside the sealed box 30. The electrode compaction density is adjusted via the control panel. An areal density measurement system 6 is also located outside the sealed box 30. After the battery electrode passes through the areal density measurement system 6 outside the sealed box 30 after roller pressing, the electrode coating uniformity is fed back to the coating mechanism 2, enabling automatic adjustment of the coating areal density.

[0046] Example 2

[0047] Battery electrodes are transported by a conveyor mechanism (e.g., a conveyor belt) 7 into the coating oven 2, passing through a baffle 4 and into a sealing box 30. The rolling mechanism 3 is installed within the sealing box 30, which is connected to the coating oven 2 via a baffle 4, a thin stainless steel plate. A gap 40 is left below the baffle 4, allowing the battery electrodes 1 to pass from the coating oven 2 through the baffle 4 and onto the smoothing roller 31. The gap height h is 50 mm. The coating oven 2 consists of multiple sections 21, 22, and 23. The oven temperature is set from low to high and then from high to low, in the direction of the battery electrode feed. That is, the temperature of the coating oven section 21 is lower than that of the middle section 22, which is higher than that of the coating oven section 23. The temperature within the coating oven 2 is maintained between 90°C and 120°C, with the temperature of the last section 23 within the coating oven 2 being 100°C.

[0048] The rolling mechanism 3 includes two rolling machines, and the two rolling machines are in the same sealed box 30. The dried battery pole piece directly enters the rolling machine, and the temperature of the battery pole piece 1″ is 73°C at this time. Among the two rolling machines, the rolling roller of the rolling machine close to the coating oven 2 is a smooth roller 31, and the rolling roller of the rolling machine away from the coating oven 2 is an embossing roller 32. The distance d between the baffle 4 and the smooth roller 31 is 2.0m. The battery pole piece 1″ first enters the smooth roller 31 to obtain a battery pole piece with a certain compaction density; and then enters the embossing roller 32 to obtain a battery pole piece with a stable compaction density and a printing on the surface. The printing depth of the embossing roller 32 is 0.8mm, and the embossing roller printing is parallel to each other in stripes with a stripe spacing of 0.7mm.

[0049] The two rollers can be controlled separately by a control mechanism 5, whose control panel is located outside the sealed box 30. The electrode compaction density is adjusted via the control panel. An areal density measurement system 6 is also located outside the sealed box 30. After the battery electrode passes through the areal density measurement system 6 outside the sealed box 30 after roller pressing, the electrode coating uniformity is fed back to the coating mechanism 2, enabling automatic adjustment of the coating areal density.

[0050] It should be noted that the battery electrode processing apparatus and method described in the embodiments of the present application can be suitably applied to a lithium-ion battery assembly line production system. Those skilled in the art will appreciate that each of the aforementioned components (such as the coating mechanism, rolling mechanism, control mechanism, measurement mechanism, and transmission mechanism, etc.) can employ existing structures, devices, or equipment, and the positions or structural relationships of the various components in the assembly line production system are arranged or associated according to the manufacturing process of the battery cells and electrode sheets, and are not particularly limited herein.

[0051] In summary, after reading this detailed disclosure, those skilled in the art will appreciate that the foregoing detailed disclosure may be presented by way of example only and may not be limiting. Although not expressly stated herein, those skilled in the art will understand that this application is intended to encompass various reasonable changes, improvements, and modifications to the embodiments. Such changes, improvements, and modifications are intended to be suggested by this disclosure and are within the spirit and scope of the exemplary embodiments of the present disclosure.

[0052] In addition, certain terms in this application have been used to describe embodiments of the present disclosure. For example, "one embodiment," "an embodiment," and / or "some embodiments" mean that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present disclosure. Therefore, it can be emphasized and should be understood that two or more references to "an embodiment" or "one embodiment" or "an alternative embodiment" in various parts of this specification do not necessarily refer to the same embodiment. In addition, particular features, structures, or characteristics may be appropriately combined in one or more embodiments of the present disclosure.

[0053] It should be understood that in the foregoing description of the embodiments of the present disclosure, in order to help understand a feature and for the purpose of simplifying the present disclosure, the present application sometimes combines various features in a single embodiment, drawing or its description. Alternatively, the present application disperses various features across multiple embodiments of the present application. However, this does not mean that the combination of these features is necessary. When reading this application, it is entirely possible for those skilled in the art to extract some of the features and understand them as separate embodiments. In other words, the embodiments in the present application can also be understood as the integration of multiple secondary embodiments. This is also true when the content of each secondary embodiment is less than all the features of a single aforementioned disclosed embodiment.

[0054] In some embodiments, numbers expressing quantities or properties used to describe and claim certain embodiments of the present application should be understood as being modified in some cases by the terms "about," "approximately," or "substantially." For example, unless otherwise indicated, "about," "approximately," or "substantially" can represent a ±20% variation of the value it describes. Therefore, in some embodiments, the numerical parameters listed in the written description and the appended claims are approximate values that can vary depending on the desired properties that a particular embodiment is attempting to obtain. In some embodiments, numerical parameters should be interpreted in light of the number of reported significant digits and by applying ordinary rounding techniques. Although some embodiments of the present application set forth a wide range of numerical ranges and parameters are approximate, the specific examples are listed as precisely as possible.

[0055] Each patent, patent application, patent application publication, and other materials, such as articles, books, specifications, publications, documents, articles, etc., cited herein is hereby incorporated by reference in its entirety for all purposes, except for any prosecution document history related thereto, any equivalent that may be inconsistent or conflicting with this document, or any equivalent prosecution document history that may have a limiting effect on the broadest scope of the claims now or hereafter associated with this document. For example, if there is any inconsistency or conflict between the description, definition, and / or use of terms associated with any incorporated material and the terminology, description, definition, and / or use associated with this document, the terminology in this document shall control.

[0056] Finally, it should be understood that the embodiments of the application disclosed herein are illustrations of the principles of the embodiments of the present application. Other modified embodiments are also within the scope of the present application. Therefore, the embodiments disclosed in the present application are merely examples and not limitations. Those skilled in the art can adopt alternative configurations based on the embodiments in the present application to implement the applications in the present application. Therefore, the embodiments of the present application are not limited to the embodiments that have been precisely described in the application.

Claims

1. A battery electrode processing device, comprising a coating mechanism for coating and baking the battery electrode and a rolling mechanism for rolling the coated and baked battery electrode, characterized in that: The rolling mechanism is installed in a sealed box, and the sealed box and the coating mechanism are separated by a baffle, and the baffle is made of heat-conducting material; the baffle has a gap between the sealing box and the coating mechanism, so that the battery electrode passes from the coating mechanism through the baffle into the sealed box; the rolling mechanism includes a smooth roller and an embossing roller, wherein the distance between the smooth roller and the baffle is smaller than the distance between the embossing roller and the baffle; the height of the gap is 20mm to 100mm; the distance between the smooth roller and the baffle is 0.2m to 4m.

2. The battery pole piece processing device according to claim 1, characterized in that: The printing depth of the embossing roller is less than or equal to 2 mm.

3. The battery pole piece processing device according to claim 1, characterized in that: The printing of the embossing roller is parallel stripes, and the spacing between the stripes is less than or equal to 1 mm.

4. The battery pole piece processing device according to claim 1, characterized in that: It also includes a control mechanism disposed outside the sealing box, for controlling the rolling mechanism to adjust the compaction density of the battery electrode.

5. The battery pole piece processing device according to claim 1, characterized in that: It also includes an area density measuring mechanism arranged outside the sealing box, which is used to measure the area density of the battery pole piece after rolling and feed it back to the coating mechanism.

6. A battery pole piece processing method, applicable to the battery pole piece processing device according to any one of claims 1 to 5, characterized in that: include: The conveying mechanism conveys the battery electrode sheets to the coating mechanism; the coating mechanism coats and bakes the battery electrode sheets; the conveying mechanism conveys the coated and baked battery electrode sheets from the coating mechanism through the gap to the rolling mechanism; the rolling mechanism includes a smooth roller and an embossing roller, wherein the distance between the smooth roller and the baffle is smaller than the distance between the embossing roller and the baffle; the height of the gap is 20 mm to 100 mm; the distance between the smooth roller and the baffle is 0.2 m to 4 m; the rolling mechanism rolls the coated and baked battery electrode sheets.

7. The battery electrode processing method according to claim 6, characterized in that: The coating mechanism is a coating oven, and the processing method further includes: setting the temperature in the coating oven so that the direction in which the battery electrode is conveyed by the conveying mechanism is from low to high and then from high to low.

8. The battery electrode processing method according to claim 7, characterized in that: The temperature in the coating oven is 60°C to 150°C, and the temperature of the oven portion close to the baffle is 80°C to 100°C.

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