Pretreatment equipment and methods for green plates used in the internal formation of lead-acid batteries

Abstract

This invention relates to a pretreatment device and method for green plates used in the internal formation of lead-acid batteries, belonging to the field of lead-acid battery technology. It solves the problem in the prior art where the water content is inconsistent at different locations on the green plate at the same depth perpendicularly inward from the surface. The invention includes a humidification component, a free water removal component, and a drying component arranged sequentially. The humidification component humidifies the solidified green plate, filling its pores with water or an aqueous solution. The free water removal component removes free water or free aqueous solution from the surface of the humidified green plate. The drying component dries the surface of the green plate, resulting in a green plate with consistent water content at the same depth perpendicularly inward from the surface. This invention uses a humidification component, a free water removal component, and a drying component arranged sequentially to humidify, remove water, and surface dry the green plate, ensuring that the final green plate has consistent water content at the same depth perpendicularly inward from the surface.

Description

Technical Field

[0001] This invention relates to the field of lead-acid battery technology, and in particular to a pretreatment device and method for green plates used in the internal formation of lead-acid batteries. Background Technology

[0002] In existing technologies, the green electrode plates are directly coated after curing during the manufacturing of lead-acid batteries. The moisture content of the cured green electrode plates is typically below 0.2%, resulting in considerable porosity within the green electrode plates. This porosity includes the lead paste itself and the corrosion layer formed at the contact points between the lead paste and the grid. During formation, due to the addition of acid, sulfuric acid enters the pores of the corrosion layer. The sulfuric acid reacts rapidly with the lead oxide and 3BS in the corrosion layer, forming lead sulfate. During subsequent formation with electricity, the lead sulfate formed in the corrosion layer through electrochemical reaction is difficult to convert; even if it is converted, it can only be partially converted into β-PbO2. On the one hand, the high resistance of lead sulfate leads to a decrease in the conductivity of the corrosion layer; on the other hand, the poor strength of the generated β-PbO2 makes it difficult to function as a framework connecting the grid and the active material, thus limiting the battery's lifespan.

[0003] To solve this problem, the cured green electrode plate can be soaked before being coated. Because the cured green electrode plate is soaked, water or an aqueous solution pre-enters the pores of the corrosion layer. During formation with sulfuric acid solution, the sulfuric acid will have difficulty penetrating the corrosion layer. During electrochemical formation, because the corrosion layer is in a neutral or alkaline environment, the corrosion layer undergoes an electrochemical reaction, first generating α-PbO2 on the positive green electrode plate. α-PbO2 has high strength and is relatively stable, ensuring the skeletal function of the grid and active material connection, thereby improving the battery's lifespan. It also avoids the problem of decreased conductivity caused by lead sulfate formation in the corrosion layer.

[0004] However, in this processing method, after the solidified green plate is processed into a wet green plate, there is free water or free water solution on the upper surface of the wet green plate. The amount of free water or water solution left on the upper surface of different green plates is inconsistent (due to the different flatness errors of different green plates). When they are put into the surface drying device together and surface dried under the same conditions (such as drying time, drying temperature, etc.), the water content of different green plates will be inconsistent. When green plates with inconsistent water content are installed in the same lead-acid battery, it will cause inconsistency between individual cells, which will lead to a decrease in battery life.

[0005] Furthermore, the uneven flatness error at different locations on the same green electrode plate leads to inconsistent amounts of free or aqueous water at different locations on its surface. This results in inconsistent water content at the same depth perpendicular to the surface of the green electrode plate when different locations on the same green electrode plate are dried under the same conditions (such as drying time and drying temperature) after entering the surface drying device. This also leads to inconsistencies between individual cells, which in turn reduces battery life. Summary of the Invention

[0006] Based on the above analysis, the present invention aims to provide a pretreatment device and method for green plates used in the internal formation of lead-acid batteries, in order to solve the problem of inconsistent water content at the same depth perpendicularly inward from the upper surface of the green plate at different locations.

[0007] On one hand, the present invention provides a pretreatment device for a green plate used in the internal formation of a lead-acid battery, comprising a humidification component, a free water removal component, and a drying component arranged sequentially; wherein, the humidification component is used to humidify the solidified green plate so that water or an aqueous solution fills the pores of the green plate; the free water removal component is used to remove free water or free aqueous solution from the surface of the humidified green plate; the drying component can dry the surface of the green plate to obtain a green plate with consistent water content at the same depth perpendicularly inward from the surface of the green plate at different locations.

[0008] Furthermore, the humidification component includes an immersion tank containing a liquid for immersing the lead-acid battery's green plates.

[0009] Furthermore, the humidification assembly includes a spray unit for spraying liquid toward the green electrode plate.

[0010] Furthermore, the humidification assembly also includes a first conveying unit, which is capable of conveying the cured green plate from the inlet of the soaking tank or the spraying unit to the outlet.

[0011] Furthermore, the free water removal assembly includes a water removal roller and a second conveying unit, wherein the water removal roller is located above the second conveying unit.

[0012] Furthermore, the dewatering roller includes a central shaft and a dewatering cylinder, with the dewatering cylinder fixedly disposed on the outer circumferential surface of the central shaft.

[0013] Furthermore, the water removal cylinder is made of an elastic material.

[0014] Furthermore, the gap between the dewatering cylinder and the second conveying unit is smaller than the thickness of the green electrode plate.

[0015] Furthermore, the water removal cylinder can be segmented or integrated.

[0016] On the other hand, the present invention provides a pretreatment method for green plates used in the internal formation of lead-acid batteries, which uses the pretreatment equipment for green plates used in the internal formation of lead-acid batteries described above to pretreat the green plates.

[0017] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0018] (1) The present invention uses a humidification component to humidify the solidified green plate, so that water or aqueous solution fills the pores of the green plate; then a free water removal component removes the free water or free aqueous solution present on the upper surface of the wet green plate, so that the upper surface of the wet green plate is as free as possible, or the amount of free water or free aqueous solution remaining at different positions on the upper surface of the wet green plate is as consistent as possible; then a drying component dries the surface of the green plate, so as to obtain a green plate with consistent water content at the same depth perpendicular to the upper surface of the green plate at different positions. Finally, the consistency of α-PbO2 content generated at the bottom of the active material of the green plate during formation is ensured, thereby ensuring the consistency of the interface, avoiding the risk of inconsistent discharge at the top and bottom of the green plate, and thus ensuring the life of the lead-acid battery.

[0019] (2) By removing free water or free aqueous solution from the surface of the green electrode plate before drying, the present invention can improve the efficiency of surface drying, thereby improving the efficiency of pretreatment of the green electrode plate for internalization.

[0020] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages may become apparent from the description or be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained from what is particularly pointed out in the description and drawings. Attached Figure Description

[0021] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0022] Figure 1 This is a schematic diagram of the pretreatment equipment for the green electrode plate used in the internal formation of lead-acid batteries according to the present invention.

[0023] Figure 2 This is a schematic diagram of the inlet location of the humidification component of the present invention;

[0024] Figure 3This is a schematic diagram showing the inlet location of the humidification component and the structure of the free water removal component of the present invention;

[0025] Figure 4 This is a schematic diagram of the structure of the free water removal component and the surface drying component of the present invention;

[0026] Figure 5 This is a schematic diagram of the first embodiment of the free water removal component in this invention;

[0027] Figure 6 This is a schematic diagram of the second embodiment of the free water removal component in this invention;

[0028] Figure 7 This is a top-view structural schematic diagram of the collection component of the present invention;

[0029] Figure 8 This is a side view of the collecting component of the present invention.

[0030] Figure label:

[0031] 1-Wetting assembly; 11-Soaking tank; 111-First end; 112-Second end; 12-First conveying unit; 2-Free water removal assembly; 21-Water removal roller; 211-Central shaft; 212-Water removal cylinder; 22-Second conveying unit; 221-Roller support; 2211-Conveying plane; 2212-Side support plate; 2213-Bottom plate; 222-Small roller; 3-Surface drying assembly; 31-Surface drying kiln; 32-Third conveying unit; 321-Third conveying shaft; 322-Drive wheel; 323-Conveyor belt; 4-Collection assembly; 41-Green plate collection bin; 42-Fourth conveying unit. Detailed Implementation

[0032] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0033] Example 1

[0034] A specific embodiment of the present invention, such as Figure 1 As shown, a pretreatment device for the green plate of lead-acid battery internal formation is disclosed, including a humidification component 1, a free water removal component 2 and a drying component arranged in sequence.

[0035] The humidification component 1 includes a first conveying unit 12 and an immersion tank 11 or a spraying unit. The first conveying unit 12 can convey the cured green plate from the inlet of the immersion tank 11 or the spraying unit to the outlet. The immersion tank 11 or the spraying unit can humidify the cured green plate so that water or aqueous solution fills the pores of the green plate. The free water removal component 2 can remove the free water or free aqueous solution present on the upper surface of the wet green plate, so that the upper surface of the wet green plate is as free as possible, or so that there is still a certain amount of residual free water or free aqueous solution on the upper surface of the green plate, but the amount of residual free water or free aqueous solution at different positions on the upper surface of the wet green plate is as consistent as possible. The drying component can dry the surface of the green plate to obtain a green plate with consistent water content at the same depth perpendicularly inward from the upper surface of the green plate at different positions.

[0036] See Figure 1 , Figure 2 The humidification component 1 includes an immersion tank 11.

[0037] The soaking tank 11 is a long, rectangular tank, preferably made of stainless steel for the outer shell and ceramic for the interior. The length of the soaking tank 11 can be specifically set according to the factory space, production cycle, and soaking time requirements of the green plates, preferably 4-8 meters. The width of the soaking tank 11 can be determined by the number of green plates to be conveyed side-by-side and the length or width of the green plates, preferably 1-2 meters. The depth of the soaking tank 11 can be determined according to the pressure required for soaking the green plates, preferably 0.6 meters, wherein the depth of the soaking solution is preferably 10cm-50cm.

[0038] The soaking tank 11 contains a liquid for soaking the green plates of lead-acid batteries. The soaking liquid can be water or an aqueous solution. The soaking tank 11 is equipped with a level gauge, a temperature sensing device, a pH value detection device, etc., and these automatic detection components are electrically connected to the control system of the soaking equipment. The soaking equipment of this invention can operate at room temperature, and the soaking time is more than 15 seconds.

[0039] The soaking tank 11 includes a first end 111 and a second end 112. The green electrode plate enters the soaking tank 11 from the first end 111 and leaves the soaking tank 11 from the second end 112.

[0040] At least a portion of the first conveying unit 12 is located within the soaking tank 11 and extends from a first end 111 to a second end 112 of the soaking tank 11. The first conveying unit 12 is used to convey the green electrode plate, which is placed on its upper surface and transported by the first conveying unit 12 from the first end 111 to the second end 112 of the soaking tank 11, thereby achieving soaking. The first conveying unit 12 can be a belt conveyor or a chain conveyor. Since it is at least partially immersed in the soaking solution within the soaking tank 11, the selected material preferably needs to be corrosion-resistant.

[0041] Furthermore, the first conveying unit 12 includes an immersion zone disposed within the immersion tank 11. The immersion zone includes a descending section extending obliquely from a first end 111 of the immersion tank 11 towards the bottom of the immersion tank 11, a bottom horizontal section extending horizontally along the bottom of the immersion tank 11, and an ascending section extending obliquely from the bottom of the immersion tank 11 towards a second end 112 of the immersion tank 11. The descending and ascending sections are partially immersed in the immersion liquid, while the bottom horizontal section is entirely immersed in the immersion liquid. The oblique angle of the descending and ascending sections is preferably 15-65 degrees, and most preferably 30 degrees.

[0042] In some other embodiments, the humidification component 1 includes a spray unit.

[0043] The spray unit forms a spray zone, which includes a first end and a second end. The green electrode plate enters the spray zone from the first end and leaves the spray zone from the second end.

[0044] The first conveying unit 12 is located below the spraying unit. Parallel first conveying shafts are provided at both ends of the first conveying unit 12. Rollers are respectively wound around the first conveying shafts at both ends of the first conveying unit 12. At least a portion of the first conveying unit 12 is located within the spraying zone and extends from the first end to the second end of the spraying zone. The first conveying unit 12 is used to convey the green electrode plate. The green electrode plate is placed on the upper surface of the first conveying unit 12 and transported from the first end to the second end of the spraying zone by the first conveying unit 12. At this time, the first conveying unit 12 is horizontally arranged. Compared to the first conveying unit 12 of the soaking tank 11, which includes an upward section and a downward section, the length of the first conveying unit 12 of the spraying unit can be greatly shortened. During this process, humidification is achieved through spraying. The first conveying unit 12 can be a belt conveyor or a chain conveyor. Since it is at least partially located within the spraying zone, the selected material preferably needs to be corrosion-resistant.

[0045] See Figure 3The free water removal component 2 is located near the outlet end of the humidification component 1 and is used to remove free water or free water solution remaining on the surface of the green electrode plate after soaking (or spraying). The free water removal component 2 includes a water removal roller 21 and a second conveying unit 22, wherein the water removal roller 21 is located above the second conveying unit 22. The second conveying unit 22 is used to convey the green electrode plate from the outlet end of the humidification component 1 to the outlet end of the free water removal component 2. During this process, the water removal roller 21 removes the free water or free water solution remaining on the surface of the green electrode plate. Preferably, the second conveying unit 22 does not provide driving force, but only supporting force, and the driving force for conveying the green electrode plate is provided sequentially by the first conveying unit 12, the water removal roller 21, and the third conveying unit 32.

[0046] The dewatering roller 21 includes a central shaft 211 and a dewatering cylinder 212. The central shaft 211 is mounted on a frame via bearings at both ends and can be driven to rotate by a drive device. The drive device can be a conventional motor, reduction gear, transmission mechanism, etc. The dewatering cylinder 212 is fixedly mounted on the outer circumferential surface of the central shaft 211. The dewatering cylinder 212 can elastically deform to fit tightly against the surface of the green electrode plate, thereby squeezing free water or free water solution on the surface of the green electrode plate from the front end to the rear end and causing it to leave the surface of the green electrode plate from the rear end.

[0047] The dewatering cylinder 212 can be segmented or integrated. A segmented dewatering cylinder 212 can have one green electrode plate per segment, reducing raw materials, thereby reducing equipment weight and lowering costs. An integrated dewatering cylinder 212 reduces processing steps, facilitates installation and debugging, and can also be used when the green electrode plate is tilted on the second conveying unit 22.

[0048] See Figure 5 The second conveying unit 22 includes a roller support 221 and a plurality of small rollers 222. The roller support 221 includes a conveying plane 2211, a plurality of side support plates 2212, and a base plate 2213. The roller support 221 is fixedly mounted on the frame or fixedly mounted on the ground between the humidification component 1 and the surface drying component 3. The conveying plane 2211 is oriented towards the dewatering rollers 21. The side support plates 2212 are arranged parallel to each other and spaced apart below the conveying plane 2211. The plurality of small rollers 222 are rotatably mounted parallel to each other on the side support plates 2212 of the roller support 221, and the tops of all the small rollers 222 are located within the conveying plane 2211.

[0049] The closest vertical distance from the surface of the dewatering roller 21 to the conveying plane 2211 of the roller support 221 is L, that is, L is the gap between the dewatering cylinder 212 and the small roller 222 of the dewatering roller 21. L should be less than or equal to the thickness D of the green electrode plate. The green electrode plate output from the outlet end of the humidification component 1 is conveyed along the conveying plane 2211 to the gap between the dewatering roller 21 and the small roller 222. When the wet green electrode plate passes through this gap, the surface of the dewatering cylinder 212 squeezes the free water or free water solution that is retained on the surface of the wet green electrode plate, squeezing the free water or free water solution that is retained on the surface of the green electrode plate from the front end to the rear end of the green electrode plate and thus making it leave the surface of the green electrode plate.

[0050] In the preferred embodiment, in the extrusion direction of the dewatering roller 21 extruding the wet raw electrode plate, the elastic deformation coefficient of the dewatering cylinder 212 on the surface of the dewatering roller 21 is greater than the elastic deformation coefficient of the wet raw electrode plate output by the humidification component 1. For example, the material of the dewatering cylinder 212 is preferably rubber. This can better remove the free water or free water solution retained on the surface of the raw electrode plate, ensuring that the water content at different positions at the same depth perpendicular to the surface of the raw electrode plate is consistent. At the same time, it can avoid damage to the surface of the dewatering cylinder 212 on the surface of the wet raw electrode plate during the extrusion process.

[0051] In addition, depending on the needs, the water removal cylinder 212 can also be made of a material with a certain adsorption capacity. In this case, the water removal cylinder 212 can not only squeeze out and remove free water and free aqueous solution, but it can also adsorb free water and free aqueous solution itself, resulting in a better water removal effect.

[0052] In one embodiment, the conveying plane 2211 is inclined downwards, such as... Figure 5 As shown. In this scheme, the green electrode plate is transported forward by the first conveying unit 12. After reaching the conveying plane 2211 of the second conveying unit 22, it moves forward under the action of gravity. The small rollers 222 can reduce the resistance to the forward movement of the green electrode plate. When the green electrode plate enters between the dehydration rollers 21 and the conveying plane 2211, it is then driven by the dehydration rollers 21 to continue moving forward until the front end moves to the third conveying unit 32 of the drying assembly. During this process, the dehydration rollers 21 squeeze the free water or free water solution retained on the upper surface of the green electrode plate from the front end to the rear end, and finally make it leave the upper surface of the green electrode plate from the rear end.

[0053] In this design, the outlet end of the conveying plane 2211 is preferably slightly lower than the upper surface of the conveyor belt of the third conveying unit 32 of the drying assembly. This arrangement allows the green electrode plate to be corrected by gravity when it is conveyed to the third conveying unit 32, i.e., the front edge of the green electrode plate is aligned with the surface of the conveyor belt of the third conveying unit 32, thus making the length direction of the green electrode plate perpendicular to the conveying direction of the third conveying unit 32.

[0054] Preferably, the height difference between the outlet end of the conveyor plane 2211 and the upper surface of the conveyor belt of the third conveyor unit 32 of the drying assembly is no greater than one-quarter of the diameter of the drive wheel 322 of the third conveyor unit 32. This arrangement can achieve deviation correction without affecting the conveying of the green plates by the third conveyor unit 32.

[0055] To ensure that the green plate is not crushed by the dewatering roller 21 and the third conveying unit 32, the length from the closest point between the conveying plane 2211 and the dewatering roller 21 to the outlet end must be greater than the length of the green plate along the conveying direction.

[0056] In another embodiment, the conveying plane 2211 may be inclined upwards, such as... Figure 6 As shown. In this scheme, the green plate is transported forward by the first conveying unit 12 to the conveying plane 2211 of the second conveying unit 22, and then continues forward until it enters the space between the dewatering roller 21 and the conveying plane 2211. After that, it is driven by the dewatering roller 21 to continue moving forward until the front end moves to the third conveying unit 32 of the drying assembly.

[0057] In this scheme, since the conveying plane 2211 is inclined upward, during the process of the green plate moving forward, the free water or free water solution that remains on the surface of the green plate will automatically flow to the rear end of the green plate under the action of gravity. After being squeezed by the dewatering cylinder 212, the free water or free water solution on the surface of the green plate can be further removed.

[0058] To ensure the green electrode plate can be stably conveyed forward, the conveying plane 2211 of the second conveying unit 22 needs to be less than twice the length of the green electrode plate along the conveying direction, while the dewatering roller 21 is positioned above the center of the conveying plane 2211. And / or, the small roller 222 can also actively rotate to drive the green electrode plate forward.

[0059] In other embodiments, the conveying plane 2211 can also be horizontally positioned. The upper surfaces of the conveying plane 2211, the second conveying unit 22, and the third conveying unit 32 are all on the same horizontal plane. In this embodiment, the dewatering roller 21 is located above the center of the conveying plane 2211. The length of the conveying plane 2211 is less than twice the length of the green plate in the conveying direction, but greater than the length of the green plate in the conveying direction, to avoid the green plate from stalling due to lack of power drive or being damaged by multiple power drives.

[0060] By using the dewatering roller 21 to squeeze and remove free water or free water solution from the upper surface of the green electrode plate, the amount of free water or free water solution on the upper surface of different green electrode plates can be kept as consistent as possible, thus reducing the problem of battery life reduction caused by inconsistent water content between green electrode plates.

[0061] See Figure 4 The surface drying component 3 is located at the outlet end of the free water removal component 2 and is used to dry the surface of the live plate after removing free water or free water solution.

[0062] The surface drying assembly 3 includes a surface drying kiln 31 and a third conveying unit 32. The third conveying unit 32 conveys the green plate from the outlet of the free water removal assembly 2 to the inlet of the collection assembly 4, and the surface drying kiln 31 is arranged on the conveying path of the third conveying unit 32.

[0063] The surface drying kiln 31 includes an input end and an output end. The green electrode plate enters the surface drying kiln 31 from the input end and exits from the output end. A third conveying unit 32 has parallel third conveying shafts 321 at both ends. Drive wheels 322 are respectively wound around the third conveying shafts 321 at both ends of the third conveying unit 32. At least a portion of the third conveying unit 32 is located inside the surface drying kiln 31 and extends from the input end to the output end. The third conveying unit 32 is used to convey the green electrode plate. After passing through the free water removal assembly 2, the green electrode plate is conveyed to the upper surface of the third conveying unit 32 and forward-conveyed from the input end to the output end of the surface drying kiln 31. The third conveying unit 32 can be a belt conveyor or a chain conveyor.

[0064] Before entering the surface drying device, the moisture content of the green electrode plate is about 6.7%, and after surface drying, the moisture content is about 5.7%. Furthermore, since the moisture content of the green electrode plate is uniform throughout the surface after the free water removal component 2 removes free water, the moisture content remains uniform at the same depth perpendicular to the surface of the green electrode plate after drying in the surface drying device.

[0065] Furthermore, the pretreatment equipment for the green plate used in the internal formation of lead-acid batteries in this embodiment also includes a collection component 4, which can collect the dried green plate for use in the next process.

[0066] See Figure 7 , Figure 8 The collecting component 4 is located near the outlet end of the surface drying component 3 and is used to collect the green plates after the surface drying is completed.

[0067] See Figure 8 The collection component 4 includes a green electrode plate collection chamber 41 and a fourth conveying unit 42. The green electrode plates that have completed surface drying are conveyed to the green electrode plate collection chamber 41 for stacking. The stacked green electrode plates are then conveyed to the next process via the fourth conveying unit 42.

[0068] Both the raw plate collection chamber 41 and the fourth conveying unit 42 can be equipped with conventional equipment from the existing technology.

[0069] Compared with the prior art, the pretreatment equipment for the green plate of lead-acid battery internal formation provided in this embodiment wets the solidified green plate, then removes the free water or free water solution on the surface of the green plate, and then dries the surface of the green plate, so that the water content of different positions of the dried green plate is consistent at the same depth from the surface (vertically) inward of the green plate, thereby extending the service life of the battery.

[0070] Example 2

[0071] Embodiment 2 of the present invention discloses a pretreatment method for green plates used in the internal formation of lead-acid batteries. The pretreatment equipment for green plates used in the internal formation of lead-acid batteries described in Embodiment 1 is used to pretreat the green plates. The pretreatment method includes the following steps:

[0072] S1: Moisten the cured green electrode plate;

[0073] S2: Remove surface free water or free aqueous solution from the humidified green plate;

[0074] S3: Perform surface drying treatment on the green electrode plate;

[0075] S4: Collect and store the dried raw plates.

[0076] In step S1, the cured green electrode plate is placed horizontally at the inlet of the first conveying unit 12 of the humidification assembly 1. The first conveying unit 12 operates to drive the green electrode plate through the immersion tank 11 or the spraying unit, thus processing the cured green electrode plate into a wet green electrode plate. The humidification treatment time is preferably 15 seconds or more.

[0077] In step S2, the wetted electrode plate is conveyed by the first conveying unit 12 to the second conveying unit 22, where the free water or free water solution on the upper surface of the wetted electrode plate is removed by the dewatering roller 21.

[0078] In step S3, the green electrode plate enters the third conveying unit 32 and is then driven by the third conveying unit 32 into the surface drying device. The surface drying device dries the surface of the green electrode plate to ensure a certain internal moisture content. Preferably, the drying temperature is 100℃-200℃ and the drying time is 10-20 seconds. Under these conditions, the moisture content of the green electrode plate after surface drying can be ensured to be approximately 5.7%.

[0079] In step S4, the dried green electrode plate is transported to the collection component 4 through the fourth conveying unit 42. The collection component 4 wraps the dried green electrode plate and places it into the tank for formation.

[0080] Because the free water or free aqueous solution on the upper surface of the wet green electrode plate is removed by squeezing, the upper surface of the green electrode plate has almost no free water or free aqueous solution, while the interior of the green electrode plate is full of water or aqueous solution. Furthermore, during surface drying, different locations on the upper surface of the green electrode plate experience the same surface drying conditions, such as temperature and time. Therefore, the surface drying moisture content is consistent at different locations on the upper surface of the green electrode plate in the direction perpendicular to the upper surface, achieving the technical effect of consistent moisture content at the same depth perpendicularly inward from the upper surface of the wet green electrode plate. At this point, the upper surface of the green electrode plate has the largest surface area.

[0081] Furthermore, the consistent moisture content across different locations on the same wet green plate ensures uniform α-PbO2 content at the bottom of the active material during formation, thereby guaranteeing interface consistency and mitigating the risk of inconsistent discharge across the green plate, thus extending the lifespan of the lead-acid battery. Additionally, removing free water or free aqueous solution from the upper surface of the wet green plate by squeezing further improves surface drying efficiency and enhances the pretreatment efficiency of the green plate used in internal formation.

[0082] Good consistency in moisture content among different wetted electrode plates refers to good consistency between different positive wetted electrode plates or different negative wetted electrode plates. In this invention, different wetted electrode plates refer to different wetted electrode plates that can be used in the same type of lead-acid battery.

[0083] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A pretreatment device for green plates used in the internal formation of lead-acid batteries, characterized in that, The device includes a humidification component, a free water removal component, and a drying component arranged sequentially. The humidification component humidifies the cured green electrode plate, filling its pores with water or an aqueous solution. The free water removal component removes free water or an aqueous solution from the upper surface of the humidified green electrode plate, ensuring the upper surface is as free as possible, or that a certain amount of residual free water or an aqueous solution remains, but the amount is consistent across different locations on the upper surface. The free water removal component includes a dewatering roller and a second conveying unit, with the dewatering roller positioned above the second conveying unit. The dewatering roller includes a central shaft and a dewatering cylinder, the latter fixedly mounted on the outer circumference of the central shaft. The gap between the dewatering cylinder and the second conveying unit is less than the thickness of the green electrode plate. The drying component dries the surface of the green electrode plate, ensuring consistent moisture content at the same depth perpendicularly inward from the upper surface of the green electrode plate across different locations.

2. The pretreatment equipment for the green plate of lead-acid battery internal formation according to claim 1, characterized in that, The humidification component includes an immersion tank containing a liquid for immersing the lead-acid battery's green plates.

3. The pretreatment equipment for the green plate of lead-acid battery internal formation according to claim 1, characterized in that, The humidification assembly includes a spray unit for spraying liquid toward the green electrode plate.

4. The pretreatment equipment for the green plate of lead-acid battery internal formation according to claim 2 or 3, characterized in that, The humidification component also includes a first conveying unit, which is capable of conveying the cured green plate from the inlet of the soaking tank or the spraying unit to the outlet.

5. The pretreatment equipment for the green plate of lead-acid battery internal formation according to claim 1, characterized in that, The water removal cylinder is made of elastic material.

6. The pretreatment equipment for the green plate of lead-acid battery internal formation according to claim 5, characterized in that, The water removal cylinder can be segmented or integrated.

7. A pretreatment method for green plates used in the internal formation of lead-acid batteries, characterized in that, The green electrode sheet is pretreated using the pretreatment equipment for green electrode plates used in the internal formation of lead-acid batteries according to any one of claims 1-6.

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