Pretreatment equipment of unformed plate for container formation of lead-acid storage battery and treatment method thereof

Abstract

The invention relates to pretreatment equipment and a pretreatment method for a green plate for internal formation of a lead-acid storage battery, belongs to the technical field of lead-acid storage batteries, and solves the problem that different positions of the green plate are inconsistent in water content at the same depth vertically inward from the upper surface of the green plate in the prior art. The device comprises a humidifying assembly, a free water removing assembly and a drying assembly which are arranged in sequence; wherein the humidifying assembly is used for carrying out humidifying treatment on the cured unformed plate, so that pores of the unformed plate are filled with water or an aqueous solution; the free water removing assembly is used for removing free water or a free water solution on the upper surface of the dehumidified green plate; the drying assembly can dry the surface of the unformed plate, and the unformed plate with consistent water content at different positions at the same depth vertically inward from the upper surface of the unformed plate is obtained. The humidifying assembly, the free water removing assembly and the drying assembly which are arranged in sequence are adopted for carrying out humidifying, water removing and surface drying treatment on the unformed plate, so that the water content of different positions of the final unformed plate at the same depth vertically inwards from the upper surface of the unformed plate is consistent.

Description

Technical Field

[0001] The present invention relates to the technical field of lead-acid batteries, and particularly to a pretreatment device and a treatment method for green plates for internal formation in lead-acid batteries. Background Art

[0002] In the prior art, during the production of lead-acid batteries, the green plates are directly wrapped after curing. The water content of the cured green plates is usually less than 0.2%, which results in a considerable number of pores in the green plates, including pores formed inside the lead paste and pores formed in the corrosion layer generated at the contact part between the lead paste and the grid. During formation, due to the addition of acid, sulfuric acid will enter the pores of the corrosion layer. Sulfuric acid will rapidly react with the lead oxide and 3BS in the corrosion layer and form lead sulfate in the corrosion layer. When power-on formation is carried out, the lead sulfate formed in the corrosion layer through electrochemical reaction is difficult to transform, and even if it is transformed, it can only be partially transformed into β-PbO2. On the one hand, due to the large resistance of lead sulfate, the conductivity of the corrosion layer will decrease. On the other hand, due to the poor strength of the generated β-PbO2, it is difficult to play the role of the skeleton connecting the grid and the active material, thus restricting the battery life.

[0003] To solve this problem, after the cured green plates are soaked and then wrapped. Since the cured green plates are soaked, the water in the water or aqueous solution enters the pores of the corrosion layer in advance. When sulfuric acid aqueous solution is added for formation, sulfuric acid will be difficult to enter the corrosion layer; during power-on formation, since the corrosion layer is in a neutral or alkaline environment, through electrochemical reaction, α-PbO2 will be first formed in the corrosion layer of the positive green plate. α-PbO2 has high strength and is relatively stable, ensuring the role of the skeleton connecting the grid and the active material, thereby improving the battery life. At the same time, it also avoids the problem of the decrease in conductivity caused by the formation of lead sulfate in the corrosion layer.

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

[0005] In addition, the flatness errors at different positions of the same green plate are different, resulting in inconsistent amounts of free water or aqueous solution at different positions on the upper surface of the same green plate. When the green plate enters the surface drying device, the surfaces at different positions of the same green plate are surface-dried under the same conditions (such as drying time, drying temperature, etc.), which will cause inconsistent water contents at the same depth perpendicular to the upper surface of the green plate at different positions of the green plate (i.e., inconsistent water contents at different positions of the same layer of green plate), and will also cause inconsistencies between individual cells, thereby reducing the battery life. Summary of the Invention

[0006] In view of the above analysis, embodiments of the present invention aim to provide a pretreatment device and method for green plates used in internal formation of lead-acid batteries to solve the problem of inconsistent water contents at the same depth perpendicular to the upper surface of the green plate at different positions of the green plate.

[0007] On the one hand, the present invention provides a pretreatment device for green plates used in internal formation of lead-acid batteries, including a humidifying component, a free water removing component, and a drying component arranged in sequence; wherein, the humidifying component is used to humidify the solidified green plate so that water or aqueous solution fills the pores of the green plate; the free water removing component is used to remove the free water or free aqueous solution on the upper 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 contents at the same depth perpendicular to the upper surface of the green plate at different positions.

[0008] Further, the humidifying component includes an immersion tank filled with a liquid for immersing green plates of lead-acid batteries.

[0009] Further, the humidifying component includes a spraying unit for spraying liquid towards the green plate.

[0010] Further, the humidifying component further includes a first conveying unit capable of conveying the solidified green plate from the entrance of the immersion tank or the spraying unit to the exit.

[0011] Further, the free water removing component includes a water removing roller and a second conveying unit, wherein the water removing roller is located above the second conveying unit.

[0012] Further, the water removing roller includes a central shaft and a water removing cylinder, and the water removing cylinder is fixedly arranged on the outer circumferential surface of the central shaft.

[0013] Further, the water removing cylinder is made of an elastic material.

[0014] Further, the gap between the water removing cylinder and the second conveying unit is smaller than the thickness of the green plate.

[0015] Furthermore, the water removal cylinder is segmented or integral.

[0016] On the other hand, the present invention provides a pretreatment method for green plates for in - tank formation of lead - acid batteries, and uses the pretreatment equipment for green plates for in - tank 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 humidifying component to humidify the cured green plates, so that water or aqueous solution fills the pores of the green plates; then, through the free - water removal component, the free water or free aqueous solution existing on the upper surface of the wet green plates is removed, so that there is as little free water or free aqueous solution as possible on the upper surface of the wet green plates, or the amount of free water or free aqueous solution remaining at different positions on the upper surface of the wet green plates is as consistent as possible; and then, through the drying component, the surface of the green plates is dried, and green plates with consistent water content at the same depth perpendicular to the upper surface of the green plates at different positions are obtained. Finally, the consistency of the content of α - PbO2 generated at the bottom of the active material of the positive green plates during formation is ensured, thereby ensuring the consistency of the interface, avoiding the risk of the expansion of inconsistent discharge between the upper and lower parts of the green plates, and thus ensuring the service life of the lead - acid battery.

[0019] (2) By removing the free water or free aqueous solution on the surface of the green plates before drying, the present invention can improve the efficiency of surface drying, and thus improve the efficiency of the pretreatment of the green plates for in - tank formation.

[0020] In the present invention, the above - mentioned technical solutions can also be combined with each other to achieve more preferred combined solutions. Other features and advantages of the present invention will be described in the subsequent specification, and some advantages can be made obvious from the specification, or understood by implementing the present invention. The objectives and other advantages of the present invention can be realized and obtained from the content specifically pointed out in the specification and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings are only used for the purpose of showing specific embodiments, and are not considered as a limitation to the present invention. Throughout the drawings, the same reference signs represent the same components.

[0022] Figure 1 It is a schematic structural diagram of the pretreatment equipment for green plates for in - tank formation of lead - acid batteries of the present invention;

[0023] Figure 2 It is a schematic structural diagram of the inlet position of the humidifying component of the present invention;

[0024] Figure 3Schematic diagram of the inlet position of the humidification component and the structure of the free water removal component of the present invention;

[0025] Figure 4 Schematic diagram of the structure of the free water removal component and the surface drying component of the present invention;

[0026] Figure 5 Schematic diagram of the structure of the first solution of the free water removal component in the present invention;

[0027] Figure 6 Schematic diagram of the structure of the second solution of the free water removal component in the present invention;

[0028] Figure 7 Schematic diagram of the structure of the collection component of the present invention from a top view perspective;

[0029] Figure 8 Side view of the collection component of the present invention.

[0030] Reference numerals:

[0031] 1 - Humidification component; 11 - Soaking pool; 111 - First end; 112 - Second end; 12 - First conveying unit; 2 - Free water removal component; 21 - Water removal roller; 211 - Central axis; 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 component; 31 - Surface drying kiln; 32 - Third conveying unit; 321 - Third conveying shaft; 322 - Driving wheel; 323 - Conveyor belt; 4 - Collection component; 41 - Green plate collection bin; 42 - Fourth conveying unit. Detailed implementation manners

[0032] The following will specifically describe the preferred embodiments of the present invention with reference to the accompanying drawings. The accompanying drawings form a part of the present invention and are used together with the embodiments of the present invention to explain the principles of the present invention, rather than to limit the scope of the present invention.

[0033] Embodiment 1

[0034] A specific embodiment of the present invention, as Figure 1 shown, discloses a pretreatment device for green plates used in the internal formation of lead-acid batteries, including a humidification component 1, a free water removal component 2, and a drying component arranged in sequence.

[0035] Among them, the humidifying 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 solidified green plates from the entrance of the immersion tank 11 or the spraying unit to the exit. The immersion tank 11 or the spraying unit can humidify the solidified green plates so that water or an aqueous solution fills the pores of the green plates. The free water removing component 2 can remove the free water or free aqueous solution existing on the upper surface of the wet green plates, so that there is as little free water or free aqueous solution as possible on the upper surface of the wet green plates, or so that there is still a certain amount of remaining free water or free aqueous solution on the upper surface of the green plates, but the amount of the remaining free water or free aqueous solution at different positions on the upper surface of the wet green plates is as consistent as possible. The drying component can dry the surface of the green plates to obtain green plates with the same water content at the same depth vertically inward from the upper surface of the green plates at different positions.

[0036] See Figure 1 , Figure 2 , the humidifying component 1 includes an immersion tank 11.

[0037] The immersion tank 11 is a long rectangular trough. It is preferably made of stainless steel for the trough shell and has a ceramic surface inside. The length of the immersion tank 11 can be specifically set according to the factory building space, production rhythm, and the required immersion time of the green plates, and is preferably 4 - 8 meters. The width of the immersion tank 11 can be determined according to the number of green plates to be conveyed side by side and the length or width of the green plates, and is preferably 1 - 2 meters. The depth of the immersion tank 11 can be determined according to the pressure required for the immersion of the green plates, and is preferably 0.6 meters, and the depth of the immersion liquid is preferably 10 cm - 50 cm.

[0038] The immersion tank 11 is filled with a liquid for immersing the green plates of lead - acid batteries. The immersion liquid can be water or an aqueous solution. A liquid level gauge, a temperature sensing device, a pH value detection device, etc. are arranged in the immersion tank 11, and these automatic detection elements are electrically connected to the control system of the immersion equipment. The immersion equipment of the present invention can work at normal temperature, and the immersion time is more than 15 seconds.

[0039] The immersion tank 11 includes a first end 111 and a second end 112. The green plates enter the immersion tank 11 from the first end 111 and leave the immersion tank 11 from the second end 112.

[0040] At least a part of the first conveying unit 12 is located in the soaking tank 11 and extends from the first end 111 to the second end 112 of the soaking tank 11. The first conveying unit 12 is used to convey the green plates. The green plates are placed on the upper surface of the first conveying unit 12 and are transported by the first conveying unit 12 from the first end 111 to the second end 112 of the soaking tank 11, and soaking is achieved during this process. The first conveying unit 12 can be a belt conveying mechanism or a chain conveying mechanism. Since it is at least partially immersed in the soaking liquid in the soaking tank 11, the selected material preferably needs to be corrosion-resistant.

[0041] Further, the first conveying unit 12 includes a soaking area arranged in the soaking tank 11. The soaking area includes a descending section extending obliquely from the first end 111 of the soaking tank 11 towards the bottom of the soaking tank 11, a bottom horizontal section extending horizontally along the bottom of the soaking tank 11, and an ascending section extending obliquely from the bottom of the soaking tank 11 towards the second end 112 of the soaking tank 11. Among them, both the descending section and the ascending section are partially immersed in the soaking liquid, and the bottom horizontal section is entirely immersed in the soaking liquid. The inclination angles of the descending section and the ascending section are preferably 15 - 65 degrees, and preferably 30 degrees.

[0042] In some other embodiments, the humidifying assembly 1 includes a spraying unit.

[0043] The spraying unit forms a spraying area. The spraying area includes a first end and a second end. The green plates enter the spraying area from the first end and leave the spraying area from the second end.

[0044] The first conveying unit 12 is located below the spraying unit. Two mutually parallel first conveying shafts are arranged at both ends of the first conveying unit 12. The two ends of the first conveying unit 12 are respectively wound on rollers on the first conveying shafts. At least a part of the first conveying unit 12 is located in the spraying area and extends from the first end to the second end of the spraying area. The first conveying unit 12 is used to convey the green plates. The green plates are placed on the upper surface of the first conveying unit 12 and are transported by the first conveying unit 12 from the first end to the second end of the spraying area. At this time, the first conveying unit 12 is horizontally arranged. Compared with the first conveying unit 12 of the soaking tank 11 including an ascending section and a descending 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 conveying mechanism or a chain conveying mechanism. Since it is at least partially located in the spraying area, the selected material preferably needs to be corrosion-resistant.

[0045] See Figure 3, except that the free water removal component 2 is arranged near the outlet end of the humidification component 1 and is used to remove the free water or free aqueous solution remaining on the upper surface of the green 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 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 aqueous solution remaining on the upper surface of the green plate. Preferably, the second conveying unit 22 does not provide driving force but only provides supporting force, and the first conveying unit 12, the water removal roller 21, and the third conveying unit 32 sequentially provide the driving force for conveying the green plate.

[0046] The water removal roller 21 includes a central shaft 211 and a water removal cylinder 212. The central shaft 211 is arranged on the frame through bearings at both ends and can be driven to rotate by a driving device. The driving device can be a conventional motor, reduction mechanism, transmission mechanism, etc. The water removal cylinder 212 is fixedly arranged on the outer circumferential surface of the central shaft 211. The water removal cylinder 212 can be elastically deformed to closely adhere to the surface of the green plate so as to squeeze the free water or free aqueous solution on the surface of the green plate from the front end to the rear end of the green plate and make it leave the surface of the green plate from the rear end.

[0047] The water removal cylinder 212 can be segmented or integral. Each segment of the segmented water removal cylinder 212 can correspond to a green plate, reducing raw materials, thereby reducing the weight of the equipment and lowering costs. The integral water removal cylinder 212 can reduce the processing procedures and is convenient for installation and debugging, and can also be applicable to the situation where the green plate is skewed 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 bottom plate 2213. The roller support 221 is fixedly arranged on the frame or fixedly arranged on the ground between the humidification component 1 and the surface drying component 3. The conveying plane 2211 faces the water removal roller 21. The side support plates 2212 are arranged in parallel at intervals below the conveying plane 2211. A plurality of small rollers 222 are rotatably arranged on the side support plates 2212 of the roller support 221 in parallel with each other, 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 water removal roller 21 to the conveying plane 2211 of the roller support 221 is L. That is, L is the gap between the water removal cylinder 212 of the water removal roller 21 and the small roller 222. L should be less than or equal to the thickness D of the green plate. The green plate output from the outlet end of the humidifying assembly 1 is conveyed along the conveying plane 2211 to the gap between the water removal roller 21 and the small roller 222. When the wet green plate passes through this gap, the surface of the water removal cylinder 212 squeezes the free water or free aqueous solution remaining on the upper surface of the wet green plate, and squeezes the free water or free aqueous solution remaining on the upper surface of the green plate from the front end of the green plate to the rear end, thereby causing it to leave the surface of the green plate.

[0050] In a preferred embodiment, in the extrusion direction of the water removal roller 21 on the wet green plate, the elastic deformation coefficient of the water removal cylinder 212 on the surface of the water removal roller 21 is greater than the elastic deformation coefficient of the wet green plate output by the humidifying assembly 1. For example, the material of the water removal cylinder 212 is preferably rubber. In this way, the free water or free aqueous solution remaining on the upper surface of the green plate can be better removed, ensuring that the water content at different positions with the same depth perpendicular to the upper surface of the green plate is consistent. At the same time, damage to the upper surface of the wet green plate caused by the surface of the water removal cylinder 212 during the extrusion process can be avoided.

[0051] In addition, according to requirements, the water removal cylinder 212 can also be made of a material with a certain adsorption capacity. At this time, the water removal cylinder 212 can not only squeeze and remove free water and free aqueous solutions, but also adsorb free water and free aqueous solutions by itself, making the water removal effect better.

[0052] In one embodiment, the conveying plane 2211 is inclined downward, as Figure 5 shown. In this solution, the green plate is transported forward by the first conveying unit 12 and moves forward under the action of gravity after reaching the conveying plane 2211 of the second conveying unit 22. The small roller 222 can reduce the resistance of the green plate moving forward. When the green plate enters between the water removal roller 21 and the conveying plane 2211, it is then driven by the water removal roller 21 to continue moving forward until the front end moves onto the third conveying unit 32 of the drying assembly. During this process, the water removal roller 21 squeezes the free water or free aqueous solution remaining on the upper surface of the green plate from the front end of the green plate to the rear end, and finally causes it to leave the upper surface of the green plate from the rear end.

[0053] In this solution, it is preferably that the outlet end of the conveying plane 2211 is slightly lower than the upper surface of the conveyor belt of the third conveying unit 32 of the drying assembly. Through this setting method, when the green plate is conveyed to the third conveying unit 32, under the action of gravity, deviation correction can be achieved, that is, the front edge of the green plate is aligned with the surface of the conveyor belt of the third conveying unit 32, so that the length direction of the green plate is perpendicular to the conveying direction of the third conveying unit 32.

[0054] Preferably, the height difference between the outlet end of the conveying plane 2211 and the upper surface of the conveyor belt of the third conveying unit 32 of the drying assembly is not greater than one-fourth of the diameter of the driving wheel 322 of the third conveying unit 32. With such a setting, deviation correction can be achieved, and it will not affect the conveyance of the green plates by the third conveying unit 32.

[0055] To ensure that the green plates will not be crushed by the water removal roller 21 and the third conveying unit 32, it is necessary to make the length from the closest point between the conveying plane 2211 and the water removal roller 21 to the outlet end greater than the length of the green plate in the conveying direction.

[0056] In another embodiment, the conveying plane 2211 can be inclined upward, as Figure 6 shown. In this solution, the green plates are transported forward by the first conveying unit 12, reach the conveying plane 2211 of the second conveying unit 22, and then continue to move forward until they enter between the water removal roller 21 and the conveying plane 2211, and then are driven by the water removal roller 21 to continue moving forward until the front end moves onto the third conveying unit 32 of the drying assembly.

[0057] In this solution, since the conveying plane 2211 is inclined upward, during the forward movement of the green plates, the free water or free aqueous solution remaining on the upper surface of the green plates will automatically flow toward the rear end of the green plates under the action of gravity, and then, through the extrusion of the water removal cylinder 212, the free water or free aqueous solution on the upper surface of the green plates can be further removed.

[0058] To ensure that the green plates can be stably conveyed forward, it is necessary to make the conveying plane 2211 of the second conveying unit 22 less than twice the length of the green plate in the conveying direction, and at the same time, make the water removal roller 21 located above the middle of the conveying plane 2211. And / or, make the small roller 222 also capable of actively rotating to drive the green plates to move forward.

[0059] In some other solutions, the conveying plane 2211 can also be set horizontally. The conveying plane 2211, the upper surfaces of the second conveying unit 22 and the third conveying unit 32 are all on the same horizontal plane. In this solution, the water removal roller 21 is located above the middle 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, and at the same time, greater than the length of the green plate in the conveying direction, so as to avoid the situation that the green plates are driven without power and thus stagnate or are damaged by multiple power drives.

[0060] By squeezing and removing the free water or free aqueous solution on the upper surface of the green plates through the water removal roller 21, it is possible to ensure as much as possible that the amounts of free water or free aqueous solution on the upper surfaces of different green plates are consistent, and reduce the problem of the decrease in battery life caused by inconsistent water content between the green plates.

[0061] SeeFigure 4 , the surface drying assembly 3 is arranged at the outlet end of the free water removing assembly 2 and is used for surface drying of the green plates after removing surface free water or free aqueous 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 plates from the outlet of the free water removing assembly 2 to the inlet end of the collecting 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 plates enter the surface drying kiln 31 from the input end and leave the drying kiln from the output end. Two ends of the third conveying unit 32 are provided with third conveying shafts 321 parallel to each other, and two ends of the third conveying unit 32 are respectively wound around driving wheels 322 on the third conveying shafts 321. At least a part of the third conveying unit 32 is located inside the surface drying kiln 31 and extends from the input end to the output end of the surface drying kiln 31. The third conveying unit 32 is used for conveying the green plates. After passing through the free water removing assembly 2, the green plates are conveyed to the upper surface of the third conveying unit 32 and are conveyed forward by the third conveying unit 32, and are transported from the input end of the surface drying kiln 31 to the output end of the surface drying kiln 31. The third conveying unit 32 can be a belt conveying mechanism or a chain conveying mechanism.

[0064] The water content of the green plates before entering the surface drying device is about 6.7%, and the water content of the surface-dried green plates is about 5.7%. Moreover, since the water content of each part of the surface of the green plates is uniform after removing free water by the free water removing assembly 2, after drying by the surface drying device, the water content at the same depth perpendicular to the upper surface of the entire green plate at different positions is still uniform.

[0065] Furthermore, the pretreatment equipment for the green plates for internal formation of lead-acid batteries in this embodiment further includes a collecting assembly 4, and the collecting assembly 4 can collect the dried green plates for use in the next process.

[0066] See Figure 7 , Figure 8 , the collecting assembly 4 is arranged near the outlet end of the surface drying assembly 3 and is used for collecting the green plates after surface drying.

[0067] See Figure 8 , the collecting assembly 4 includes a green plate collecting bin 41 and a fourth conveying unit 42, conveys the green plates after surface drying to the green plate collecting bin 41 for stacking, and the stacked green plates are conveyed by the fourth conveying unit 42 to the next process.

[0068] Both the green plate collecting bin 41 and the fourth conveying unit 42 can adopt conventional equipment in the prior art.

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

[0070] Embodiment 2

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

[0072] S1: Humidify the solidified green plate;

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

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

[0075] S4: Collect and store the dried green plate.

[0076] Among them, in step S1, the solidified green plate is horizontally placed at the entrance of the first conveying unit 12 of the humidifying assembly 1, and the first conveying unit 12 operates to drive the green plate through the soaking pool 11 or the spraying unit to process the solidified green plate into a wet green plate. The time for humidification treatment is preferably more than 15 seconds.

[0077] In step S2, the wet green plate is conveyed by the first conveying unit 12 to the second conveying unit 22, and the free water or free aqueous solution on the upper surface of the wet green plate is squeezed out by the water removal roller 21.

[0078] In step S3, the green plate enters the third conveying unit 32, and then is driven by the third conveying unit 32 into the surface drying device. The surface drying device dries the surface of the green plate to ensure a certain water content inside. Preferably, the drying temperature is 100°C - 200°C, and the drying time is 10 seconds - 20 seconds. Under this condition, it can ensure that the water content of the green plate after surface drying is about 5.7%.

[0079] In step S4, the dried green plate is conveyed by the fourth conveying unit 42 to the collecting assembly 4, and the collecting assembly 4 wraps the wet green plate after surface drying, puts it into the tank and forms it.

[0080] After squeezing to remove the free water or free aqueous solution on the upper surface of the wet green plate, there is almost no free water or free aqueous solution on the upper surface of the green plate, while the inside of the green plate is filled with water or aqueous solution. In addition, when surface drying, the same surface drying conditions, such as temperature and time, exist at different positions on the upper surface of the green plate. Therefore, the moisture dried on the upper surface of the green plate is the same in the direction perpendicular to the upper surface of the green plate at different positions, achieving the technical effect that the water content is the same at the same depth from the upper surface of the green plate vertically inward at different positions of the wet green plate. At this time, the upper surface of the green plate is the surface with the largest surface area of the green plate.

[0081] In addition, the water content consistency is good at different positions of the same wet green plate, ensuring the consistency of the α-PbO2 content generated at the bottom of the positive active material during formation, and further ensuring the consistency of the interface, avoiding the risk of the expansion of inconsistent upper and lower discharge of the green plate, and thus ensuring the service life of the lead-acid battery. In addition, in the case of squeezing to remove the free water or free aqueous solution on the upper surface of the wet green plate, the efficiency of surface drying can be further improved, and the efficiency of the pretreatment of the green plate for internal formation can be improved.

[0082] The good water content consistency between different wet green plates means good consistency between different positive wet green plates or good consistency between different negative wet green plates. In the present invention, different wet green plates refer to different wet green plates that can be used for the same type of lead-acid battery.

[0083] As mentioned above, the above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention.

Claims

1. Pretreatment equipment for raw plates used in internal formation of lead-acid batteries, characterized in that, It includes a humidification component, a free water removal component, and a drying component arranged in sequence; wherein, the humidification component is used to humidify the solidified green plates so that water or aqueous solution fills the pores of the green plates; the free water removal component is used to remove the free water or free aqueous solution on the upper surface of the humidified green plates; the drying component can dry the surface of the green plates to obtain green plates with consistent water content at the same depth measured vertically inward from the upper surface of the green plates at different positions.

2. The pretreatment equipment for the green plate used in the internal formation of lead-acid batteries according to claim 1, characterized in that, The humidification component includes an immersion tank, and the immersion tank is filled with a liquid for immersing the green plates of lead-acid batteries.

3. The pretreatment equipment for the green plate used in the internal formation of lead-acid batteries according to claim 1, characterized in that, The humidification component includes a spraying unit, and the spraying unit is used to spray liquid towards the green plates.

4. The pretreatment equipment for the green plate used in the internal formation of lead-acid batteries according to claim 2 or 3, characterized in that, The humidification component further includes a first conveying unit, and the first conveying unit can convey the solidified green plates from the immersion tank or the inlet of the spraying unit to the outlet.

5. The pretreatment equipment for the green plate used in the internal formation of lead-acid batteries according to claim 1, characterized in that, The free water removal component includes a water removal roller and a second conveying unit, and the water removal roller is located above the second conveying unit.

6. The pretreatment equipment for the green plate used in the internal formation of lead-acid batteries according to claim 5, characterized in that, The water removal roller includes a central shaft and a water removal cylinder, and the water removal cylinder is fixedly arranged on the outer circumferential surface of the central shaft.

7. The pretreatment equipment for the green plate used in the internal formation of lead-acid batteries according to claim 6, characterized in that, The water removal cylinder is made of an elastic material.

8. The pretreatment equipment for the green plate used in the internal formation of lead-acid batteries according to claim 7, characterized in that, The gap between the water removal cylinder and the second conveying unit is smaller than the thickness of the green plates.

9. The pretreatment equipment for the green plates for in - tank formation of lead - acid batteries according to any one of claims 6 - 8, characterized in that, The water removal cylinder is segmented or integral.

10. A pretreatment method for green plates used in internal formation of lead-acid batteries, characterized in that, Use the pretreatment equipment for the green plates for internal formation of lead-acid batteries according to any one of claims 1-9 to pretreat the green plates.

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