Compression roller assembly for accumulator plate coating machine

Abstract

The utility model discloses a compression roller assembly for a storage battery pole plate coating machine, which comprises an upper compression roller and a lower compression roller which are arranged in parallel, the peripheral walls of the upper compression roller and the lower compression roller are respectively provided with a lug boss, each lug boss comprises a plurality of bulges matched with the surface of a pole plate, and a gap smaller than the thickness of the pole plate is formed between the upper compression roller and the lower compression roller. According to the scheme, a plurality of bulges matched with the surface of the polar plate are arranged on the peripheral walls of the upper compression roller and the lower compression roller, so that a plurality of recesses are formed in the surface of the polar plate, on one hand, the compaction degree of lead paste and a grid is increased, and on the other hand, the surface area of the filled polar plate is increased, so that the contact area between the polar plate and electrolyte is increased; and the charging and discharging performance of the storage battery is improved in the electrochemical reaction process of the storage battery.

Description

Technical Field

[0001] This utility model relates to the field of pressure roller technology for coating machines, and in particular to a pressure roller assembly for a battery plate coating machine. Background Technology

[0002] The grid is one of the most crucial components of a lead-acid battery. After the grid is manufactured, lead paste needs to be applied to it to form the battery plates. Currently, the plates for lead-acid batteries in China are generally paste-coated plates. The production steps for paste-coated plates roughly include: preparation of lead paste, application and pressing of lead paste onto the grid, and drying of the applied lead paste. The application and pressing of lead paste onto the grid usually requires a coating machine. Existing coating machines further press the coated plates using smooth rollers, which limits the contact area between the plate surface and the electrolyte, resulting in generally poor battery charge and discharge performance.

[0003] For example, Chinese Patent Publication No. CN116706002A, published on September 5, 2023, entitled "A Lead-Acid Battery Grid Processing Paste Coating Machine," includes a paste coating mechanism mounted on a frame. The paste coating mechanism includes: a housing; a moving mechanism disposed within the housing, on which a paste coating part is connected and installed; the moving mechanism is connected to a push-pull mechanism, which moves the moving mechanism on the housing, thereby pushing the paste coating part to move; and a paste supply mechanism adapted to the paste coating part, disposed on the housing, which provides paste to the paste coating part.

[0004] The drawback of existing patents is that existing coating machines further press the coated plates together using smooth rollers, which limits the contact area between the plate surface and the electrolyte. Utility Model Content

[0005] The purpose of this invention is to solve the problem that existing coating machines use smooth rollers to further press the coated plates, resulting in limited contact area between the plate surface and the electrolyte. This invention provides a roller assembly for a battery plate coating machine that increases the contact area between the plate surface and the electrolyte.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A pressure roller assembly for a battery plate coating machine includes an upper pressure roller and a lower pressure roller arranged in parallel. Both the upper and lower pressure rollers have protrusions on their outer peripheral walls, each protruding to mate with the surface of the plate. A gap smaller than the thickness of the plate is formed between the upper and lower pressure rollers. This pressure roller assembly for a battery plate coating machine, by providing several protrusions on the outer peripheral walls of the upper and lower pressure rollers to mate with the plate surface, creates several depressions on the plate surface. This increases the tightness of the lead paste against the grid and increases the surface area of ​​the plate after coating, thereby increasing the contact area between the plate and the electrolyte. This improves the charge and discharge performance of the battery during the electrochemical reaction process.

[0008] To increase the tightness of the lead paste and the grid, a gap smaller than the thickness of the electrode plate is formed between the upper and lower pressure rollers. The gap between the upper and lower pressure rollers is the gap formed between the outer peripheral wall of the protrusion of the upper pressure roller and the outer peripheral wall of the protrusion of the lower pressure roller.

[0009] Preferably, the protrusions on the upper pressure roller include a plurality of protrusions evenly distributed on the outer peripheral wall of the upper pressure roller. This forms a plurality of evenly distributed depressions on the upper surface of the electrode plate, thereby increasing the contact area between the electrode plate and the electrolyte, improving the charge and discharge performance of the battery during the electrochemical reaction process, and preventing the electrode plate from having areas that are too thin or too thick.

[0010] Preferably, the protrusions on the lower pressure roller include a plurality of protrusions evenly distributed on the outer peripheral wall of the lower pressure roller. This forms a plurality of evenly distributed depressions on the lower surface of the electrode plate, thereby increasing the contact area between the electrode plate and the electrolyte, improving the charge and discharge performance of the battery during the electrochemical reaction process, and preventing the electrode plate from having areas that are too thin or too thick.

[0011] Preferably, the protrusions on the upper pressure roller include several groups of protrusions evenly distributed along the axis of the upper pressure roller. The protrusions within each group are evenly distributed circumferentially along the axis of the upper pressure roller, and the protrusions in adjacent groups correspond one-to-one along the axial direction of the upper pressure roller. Each group includes several protrusions. In this technical solution, the protrusions on the upper pressure roller are evenly distributed along the axial direction of the upper pressure roller and evenly distributed circumferentially along the axis of the upper pressure roller.

[0012] Preferably, the protrusions on the lower pressure roller include several groups of protrusions evenly distributed along the axis of the lower pressure roller. The protrusions within each group are evenly distributed circumferentially along the axis of the lower pressure roller, and the protrusions in adjacent groups are staggered along the axial direction of the lower pressure roller. Each group includes several protrusions. In this technical solution, the lower pressure roller cooperates with the aforementioned upper pressure roller to stagger the distribution of the protrusions on the upper and lower pressure rollers, thereby ensuring more uniform compression of the lead paste and the grid, and preventing the protrusions on the upper and lower pressure rollers from causing localized compression and loosening of the lead paste on the electrode plate.

[0013] Preferably, the protrusion on the upper pressure roller is a regular square truncated pyramid, with one lower bottom edge of the protrusion parallel to the axis of the upper pressure roller. This improves the clamping force between the lead paste and the grid.

[0014] Preferably, the protrusion on the lower pressure roller is a regular square frustum, with the diagonal of the base of the protrusion parallel to the axis of the lower pressure roller. This ensures that the protrusions on the upper and lower pressure rollers are staggered, resulting in more uniform compression of the lead paste and the grid, and preventing the protrusions on the upper and lower pressure rollers from pressing against each other, which could cause localized compression and loosening of the lead paste on the electrode plate.

[0015] Preferably, the protrusions on the upper and lower pressure rollers are congruent regular square truncated pyramids, with the distance between two adjacent regular square truncated pyramids on the upper pressure roller being greater than the distance between two adjacent regular square truncated pyramids on the lower pressure roller. Since the diagonal of the base of each protrusion is parallel to the axis of the lower pressure roller, the greater distance between two adjacent regular square truncated pyramids on the upper pressure roller makes the protrusions on the lower pressure roller more compact. In this technical solution, the distance between the protrusions on the lower pressure roller refers to the distance between the base corners of two adjacent protrusions.

[0016] Preferably, the volumes of the protrusions on both the upper and lower pressure rollers gradually increase along the axial direction of the upper pressure roller. In this technical solution, the protrusions on the upper and lower pressure rollers are similar bodies, and the volumes of the protrusions on both the upper and lower pressure rollers gradually increase along the axial direction of the upper pressure roller. This allows the surface area of ​​the electrode plate to gradually increase along one side. Since the current density is higher near the end of the grid tabs and lower at the far end during battery current conduction, increasing the surface area of ​​the electrode plate near the tabs further improves the battery's charging and discharging performance. In the actual pressing process, the grid plate on the side closer to the tabs is placed in the pressing area with larger protrusion volumes, and the grid plate on the side farther from the tabs is placed in the pressing area with smaller protrusion volumes.

[0017] Preferably, the grooves formed by the protrusions on the upper pressure roller on the upper surface of the electrode plate are mapped onto the lower surface of the electrode plate and partially fall into the grooves formed by the protrusions on the lower pressure roller on the lower surface of the electrode plate. This ensures that the protrusions on the upper and lower pressure rollers are staggered, resulting in more uniform compression of the lead paste and the grid, and preventing the protrusions on the upper and lower pressure rollers from causing localized compression and loosening of the lead paste on the electrode plate.

[0018] Therefore, this utility model has the following beneficial effects: by setting a number of protrusions that cooperate with the surface of the electrode plate on the outer peripheral wall of the upper and lower pressure rollers, a number of depressions are formed on the surface of the electrode plate. On the one hand, the tightness between the lead paste and the grid is increased, and on the other hand, the surface area of ​​the electrode plate after filling is increased, thereby increasing the contact area between the electrode plate and the electrolyte, so that the battery charging and discharging performance is improved during the electrochemical reaction process. Attached Figure Description

[0019] Figure 1 This is a cross-sectional view of the present invention.

[0020] Figure 2 This is a cross-sectional view of the lower pressure roller in this utility model.

[0021] Figure 3 This is a cross-sectional view of the upper pressure roller in this utility model.

[0022] Figure 4 yes Figure 1 A magnified view of a portion of point A in the middle.

[0023] As shown in the picture:

[0024] Upper pressure roller 1, lower pressure roller 2, protrusion 3. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the utility model will be further described below in conjunction with the accompanying drawings and specific implementation methods.

[0026] Example 1, as Figure 1 , Figure 2 , Figure 3 , Figure 4 The pressure roller assembly for a battery plate coating machine shown includes an upper pressure roller 1 and a lower pressure roller 2 arranged in parallel. Both the upper pressure roller 1 and the lower pressure roller 2 have protrusions on their outer peripheral walls. The protrusions include a number of protrusions 3 that cooperate with the surface of the plate. A gap smaller than the thickness of the plate is formed between the upper pressure roller 1 and the lower pressure roller 2.

[0027] The grid is one of the most crucial components of a lead-acid battery. After the grid is manufactured, lead paste needs to be applied to it to form the battery plates. Currently, the plates for lead-acid batteries in China are generally paste-coated plates. The production steps for paste-coated plates roughly include: preparation of lead paste, application and pressing of lead paste onto the grid, and drying of the applied lead paste. The application and pressing of lead paste onto the grid usually requires a coating machine. Existing coating machines further press the coated plates using smooth rollers, which limits the contact area between the plate surface and the electrolyte, resulting in generally poor battery charge and discharge performance.

[0028] To address the problem that existing coating machines use smooth rollers to further press the coated plates, resulting in limited contact area between the plate surface and the electrolyte, a roller assembly for a battery plate coating machine is provided to increase the contact area between the plate surface and the electrolyte.

[0029] In the above embodiment, a pressure roller assembly for a battery plate coating machine is provided with several protrusions 3 on the outer peripheral walls of the upper pressure roller 1 and the lower pressure roller 2 that cooperate with the surface of the plate, so that several depressions are formed on the surface of the plate. On the one hand, this increases the tightness between the lead paste and the grid, and on the other hand, it increases the surface area of ​​the plate after coating, thereby increasing the contact area between the plate and the electrolyte, so that the battery can improve its charging and discharging performance during the electrochemical reaction process.

[0030] To increase the tightness of the lead paste and the grid, a gap smaller than the thickness of the electrode plate is formed between the upper pressure roller 1 and the lower pressure roller 2. The gap formed between the upper pressure roller 1 and the lower pressure roller 2 is the gap formed between the outer peripheral wall of the protrusion of the upper pressure roller 1 and the outer peripheral wall of the protrusion of the lower pressure roller 2.

[0031] The protrusions 3 on the upper pressure roller 1 and 2 and 3 on the lower pressure roller are further optimized. The groove formed by the protrusion 3 on the upper pressure roller 1 on the upper surface of the electrode plate is mapped onto the lower surface of the electrode plate and partially falls into the groove formed by the protrusion 3 on the lower pressure roller 2 on the lower surface of the electrode plate. This makes the protrusions 3 on the upper pressure roller 1 and 2 staggered, so that the pressure between the lead paste and the grid is more uniform, and prevents the problem of local compression and loosening of the lead paste on the electrode plate caused by the protrusions 3 on the upper pressure roller 1 and 2 pressing against each other.

[0032] Example 2, as Figure 1 , Figure 2 , Figure 3 , Figure 4 The pressure roller assembly for a battery plate coating machine shown includes an upper pressure roller 1 and a lower pressure roller 2 arranged in parallel. Both the upper pressure roller 1 and the lower pressure roller 2 have protrusions on their outer peripheral walls. The protrusions include a number of protrusions 3 that cooperate with the surface of the plate. A gap smaller than the thickness of the plate is formed between the upper pressure roller 1 and the lower pressure roller 2.

[0033] The upper pressure roller 1 is further optimized, and the protrusions on the upper pressure roller 1 include several protrusions 3 evenly distributed on the outer peripheral wall of the upper pressure roller 1. This forms several evenly distributed depressions on the upper surface of the electrode plate, thereby increasing the contact area between the electrode plate and the electrolyte, improving the charging and discharging performance of the battery during the electrochemical reaction process, and preventing the electrode plate from having areas that are too thin or too thick.

[0034] The lower pressure roller 2 is further optimized by including several protrusions 3 evenly distributed on the outer peripheral wall of the lower pressure roller 2. This creates several evenly distributed depressions on the lower surface of the electrode plate, thereby increasing the contact area between the electrode plate and the electrolyte. This improves the charging and discharging performance of the battery during the electrochemical reaction process, while preventing the electrode plate from having areas that are too thin or too thick.

[0035] The protrusions 3 on the upper pressure roller 1 and 2 and 3 on the lower pressure roller are further optimized. The groove formed by the protrusion 3 on the upper pressure roller 1 on the upper surface of the electrode plate is mapped onto the lower surface of the electrode plate and partially falls into the groove formed by the protrusion 3 on the lower pressure roller 2 on the lower surface of the electrode plate. This makes the protrusions 3 on the upper pressure roller 1 and 2 staggered, so that the pressure between the lead paste and the grid is more uniform, and prevents the problem of local compression and loosening of the lead paste on the electrode plate caused by the protrusions 3 on the upper pressure roller 1 and 2 pressing against each other.

[0036] The above embodiment provides several protrusions 3 on the outer peripheral walls of the upper pressure roller 1 and the lower pressure roller 2 that mate with the surface of the electrode plate, thereby forming several depressions on the surface of the electrode plate. This increases the tightness between the lead paste and the grid, and also increases the surface area of ​​the electrode plate after coating, thereby increasing the contact area between the electrode plate and the electrolyte, and improving the charging and discharging performance of the battery during the electrochemical reaction process.

[0037] Example 3, as Figure 1 , Figure 2 , Figure 3 , Figure 4 The pressure roller assembly for a battery plate coating machine shown includes an upper pressure roller 1 and a lower pressure roller 2 arranged in parallel. Both the upper pressure roller 1 and the lower pressure roller 2 have protrusions on their outer peripheral walls. The protrusions include a number of protrusions 3 that cooperate with the surface of the plate. A gap smaller than the thickness of the plate is formed between the upper pressure roller 1 and the lower pressure roller 2.

[0038] In this embodiment, the protrusions on the upper pressure roller 1 include several groups of protrusions 3 evenly distributed along the axis of the upper pressure roller 1. The protrusions 3 within each group of protrusions 3 are evenly distributed circumferentially according to the axis of the upper pressure roller 1, and the protrusions 3 within adjacent groups of protrusions 3 correspond one-to-one in the axial direction of the upper pressure roller 1. Each group of protrusions 3 includes several protrusions 3. In this technical solution, the protrusions 3 on the upper pressure roller 1 are evenly distributed along the axial direction of the upper pressure roller 1 and are evenly distributed circumferentially according to the axis of the upper pressure roller 1.

[0039] Specifically, the protrusions on the lower pressure roller 2 include several groups of protrusions 3 evenly distributed along the axis of the lower pressure roller 2. Within each group of protrusions 3, the protrusions 3 are evenly distributed circumferentially along the axis of the lower pressure roller 2, and the protrusions 3 within adjacent groups of protrusions 3 are staggered along the axial direction of the lower pressure roller 2. Each group of protrusions 3 includes several protrusions 3. In this technical solution, the lower pressure roller 2 cooperates with the aforementioned upper pressure roller 1 to stagger the distribution of the protrusions 3 on the upper pressure roller 1 and the lower pressure roller 2, thereby ensuring more uniform compression of the lead paste and the grid, and preventing the protrusions 3 on the upper pressure roller 1 and the lower pressure roller 2 from pressing against each other, causing localized compression and loosening of the lead paste on the electrode plate.

[0040] The protrusion 3 on the upper pressure roller 1 is further optimized. The protrusion 3 on the upper pressure roller 1 is a regular square truncated pyramid, and one of the lower bottom edges of the protrusion 3 is set parallel to the axis of the upper pressure roller 1. This improves the clamping force between the lead paste and the grid.

[0041] The protrusions 3 on the lower pressure roller 2 are further optimized. The protrusions 3 on the lower pressure roller 2 are regular square truncated pyramids, and the diagonal of the bottom surface of the protrusion 3 is set parallel to the axis of the lower pressure roller 2. This is to make the protrusions 3 on the upper pressure roller 1 and the protrusions 3 on the lower pressure roller 2 staggered, so as to make the compression of the lead paste and the grid more uniform and to prevent the problem of local compression and local loosening of the lead paste on the electrode plate caused by the protrusions 3 on the upper pressure roller 1 and the protrusions 3 on the lower pressure roller 2 pressing against each other.

[0042] The protrusions 3 on the upper pressure roller 1 and 2 on the lower pressure roller are further optimized. The protrusions 3 on the upper pressure roller 1 and 2 on the lower pressure roller are congruent regular square truncated pyramids. The distance between two adjacent regular square truncated pyramids on the upper pressure roller 1 is greater than the distance between two adjacent regular square truncated pyramids on the lower pressure roller 2. Since the diagonal of the base of the protrusion 3 is parallel to the axis of the lower pressure roller 2, the greater distance between two adjacent regular square truncated pyramids on the upper pressure roller 1 makes the protrusions 3 on the lower pressure roller 2 more compact. In this technical solution, the distance between the protrusions 3 on the lower pressure roller 2 refers to the distance between the base corners of two adjacent protrusions 3. This ensures that the groove formed by the protrusions 3 on the upper pressure roller 1 on the upper surface of the electrode plate is mapped onto the lower surface of the electrode plate and partially falls into the groove formed by the protrusions 3 on the lower pressure roller 2 on the lower surface of the electrode plate. This is to ensure that the protrusions 3 on the upper pressure roller 1 and the lower pressure roller 2 are staggered, so that the pressure of the lead paste and the grid is more uniform, and to prevent the protrusions 3 on the upper pressure roller 1 and the lower pressure roller 2 from pressing against each other, causing the lead paste on the electrode plate to be locally compressed and locally loose.

[0043] The above embodiment provides several protrusions 3 on the outer peripheral walls of the upper pressure roller 1 and the lower pressure roller 2 that mate with the surface of the electrode plate, thereby forming several depressions on the surface of the electrode plate. This increases the tightness between the lead paste and the grid, and also increases the surface area of ​​the electrode plate after coating, thereby increasing the contact area between the electrode plate and the electrolyte, and improving the charging and discharging performance of the battery during the electrochemical reaction process.

[0044] Example 4, as Figure 1 , Figure 2 , Figure 3 , Figure 4 The pressure roller assembly for a battery plate coating machine shown includes an upper pressure roller 1 and a lower pressure roller 2 arranged in parallel. Both the upper pressure roller 1 and the lower pressure roller 2 have protrusions on their outer peripheral walls. The protrusions include a number of protrusions 3 that cooperate with the surface of the plate. A gap smaller than the thickness of the plate is formed between the upper pressure roller 1 and the lower pressure roller 2.

[0045] In this embodiment, the volume of the protrusion 3 on the upper pressure roller 1 and the volume of the protrusion 3 on the lower pressure roller 2 both gradually increase in the same direction along the axial direction of the upper pressure roller 1. In this technical solution, the protrusion 3 on the upper pressure roller 1 and the protrusion 3 on the lower pressure roller 2 are similar bodies, and the volumes of the protrusion 3 on both the upper pressure roller 1 and the lower pressure roller 2 gradually increase in the same direction along the axial direction of the upper pressure roller 1. This allows the surface area of ​​the electrode plate to gradually increase along one side. Since the current density is higher near the end of the grid tab and lower at the far end during the battery's current conduction process, increasing the surface area of ​​the electrode plate near the end of the tab further improves the battery's charging and discharging performance. In the actual pressing process, the grid plate on the side closer to the tab is placed in the pressing area with a larger volume of protrusion 3, and the grid plate on the side farther from the tab is placed in the pressing area with a smaller volume of protrusion 3.

[0046] The upper pressure roller 1 is further optimized, and the protrusions on the upper pressure roller 1 include several protrusions 3 evenly distributed on the outer peripheral wall of the upper pressure roller 1. This forms several evenly distributed depressions on the upper surface of the electrode plate, thereby increasing the contact area between the electrode plate and the electrolyte, improving the charging and discharging performance of the battery during the electrochemical reaction process, and preventing the electrode plate from having areas that are too thin or too thick.

[0047] The lower pressure roller 2 is further optimized by including several protrusions 3 evenly distributed on the outer peripheral wall of the lower pressure roller 2. This creates several evenly distributed depressions on the lower surface of the electrode plate, thereby increasing the contact area between the electrode plate and the electrolyte. This improves the charging and discharging performance of the battery during the electrochemical reaction process, while preventing the electrode plate from having areas that are too thin or too thick.

[0048] The protrusions 3 on the upper pressure roller 1 and 2 and 3 on the lower pressure roller are further optimized. The groove formed by the protrusion 3 on the upper pressure roller 1 on the upper surface of the electrode plate is mapped onto the lower surface of the electrode plate and partially falls into the groove formed by the protrusion 3 on the lower pressure roller 2 on the lower surface of the electrode plate. This makes the protrusions 3 on the upper pressure roller 1 and 2 staggered, so that the pressure between the lead paste and the grid is more uniform, and prevents the problem of local compression and loosening of the lead paste on the electrode plate caused by the protrusions 3 on the upper pressure roller 1 and 2 pressing against each other.

[0049] The above embodiment provides several protrusions 3 on the outer peripheral walls of the upper pressure roller 1 and the lower pressure roller 2 that mate with the surface of the electrode plate, thereby forming several depressions on the surface of the electrode plate. This increases the tightness between the lead paste and the grid, and also increases the surface area of ​​the electrode plate after coating, thereby increasing the contact area between the electrode plate and the electrolyte, and improving the charging and discharging performance of the battery during the electrochemical reaction process.

[0050] The specific embodiments described above are merely preferred embodiments of this utility model and are not intended to limit the specific scope of implementation of this utility model. All equivalent changes made to the shape and structure of this utility model should be included within the protection scope of this utility model.

Claims

1. A pressure roller assembly for a battery plate coating machine, comprising an upper pressure roller and a lower pressure roller arranged in parallel, characterized in that, Both the upper and lower pressure rollers have protrusions on their outer peripheral walls. The protrusions include several protrusions that mate with the surface of the electrode plate. A gap smaller than the thickness of the electrode plate is formed between the upper and lower pressure rollers.

2. The pressure roller assembly for a battery plate coating machine according to claim 1, characterized in that, The protrusions on the upper pressure roller include a number of protrusions evenly distributed on the outer peripheral wall of the upper pressure roller.

3. A pressure roller assembly for a battery plate coating machine according to claim 1 or 2, characterized in that, The protrusions on the lower pressure roller include a number of protrusions evenly distributed on the outer peripheral wall of the lower pressure roller.

4. The pressure roller assembly for a battery plate coating machine according to claim 1, characterized in that, The protrusions on the upper pressure roller include several groups of protrusions evenly distributed along the axis of the upper pressure roller. The protrusions in each group are evenly distributed along the circumference according to the axis of the upper pressure roller, and the protrusions in two adjacent groups correspond one-to-one in the axial direction of the upper pressure roller.

5. A pressure roller assembly for a battery plate coating machine according to claim 1 or 4, characterized in that, The protrusions on the lower pressure roller include several groups of protrusions evenly distributed along the axis of the lower pressure roller. The protrusions in each group are evenly distributed along the circumference according to the axis of the lower pressure roller, and the protrusions in adjacent groups are staggered in the axial direction of the lower pressure roller.

6. The pressure roller assembly for a battery plate coating machine according to claim 3, characterized in that, The protrusion on the upper pressure roller is a regular square truncated pyramid, and the lower bottom edge of one side of the protrusion is arranged parallel to the axis of the upper pressure roller.

7. A pressure roller assembly for a battery plate coating machine according to claim 6, characterized in that, The protrusion on the lower pressure roller is a regular square truncated pyramid, and the diagonal of the bottom surface of the protrusion is parallel to the axis of the lower pressure roller.

8. A pressure roller assembly for a battery plate coating machine according to claim 3, characterized in that, The protrusions on the upper and lower pressure rollers are congruent regular square truncated pyramids, and the distance between two adjacent regular square truncated pyramids on the upper pressure roller is greater than the distance between two adjacent regular square truncated pyramids on the lower pressure roller.

9. A pressure roller assembly for a battery plate coating machine according to claim 3, characterized in that, The volume of the protrusion on the upper pressure roller and the volume of the protrusion on the lower pressure roller both increase gradually in the same direction along the axial direction of the upper pressure roller.

10. A pressure roller assembly for a battery plate coating machine according to claim 3, characterized in that, The groove formed by the protrusions on the upper pressure roller on the upper surface of the electrode plate is mapped onto the lower surface of the electrode plate and partially falls into the groove formed by the protrusions on the lower pressure roller on the lower surface of the electrode plate.

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