Manufacturing method for positive electrode plate for lead-acid battery

Abstract

To provide a manufacturing technology for a positive electrode plate for a lead-acid battery that has excellent performance while taking advantage of the advantages of wet methods.SOLUTION: A method for manufacturing a positive electrode plate used in a lead-acid battery includes a filling step of filling a cylindrical body 20 having a core metal 33 therein with lead paste, and a cleaning step of cleaning the cylindrical body 20 filled with lead paste.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The technology disclosed in this specification relates to a method for manufacturing a positive electrode plate for a lead-acid battery. [Background technology]

[0002] Clad plates are sometimes used as the positive electrodes of lead-acid batteries. Clad plates are electrodes that use a cylindrical body to hold the active material, lead. There are two methods for filling the cylindrical body with lead: dry and wet. The dry method is a method in which lead is filled in the form of lead powder, while the wet method is a method in which a paste made by mixing lead powder and dilute sulfuric acid is filled. The following Patent Documents 1 and 2 are documents related to the manufacturing method of clad plates. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 58-145063 [Patent Document 2] Japanese Unexamined Patent Publication No. 58-112251 Summary of the Invention [Problem to be solved by the invention]

[0004] In the wet method, lead powder is filled into the cylinder in a paste state, which means that there is less dust generated during filling (lead powder dust leaking from the cylinder) compared to the dry method, making it more environmentally friendly.

[0005] This specification discloses a manufacturing technique for a positive electrode plate for a lead-acid battery that has excellent performance while taking advantage of the advantages of the wet method. [Means for solving the problem]

[0006] The technology disclosed in this specification is a method for manufacturing a positive electrode plate used in a lead-acid battery, and includes a filling step of filling a cylindrical body having a core metal therein with lead paste, and a cleaning step of cleaning the cylindrical body filled with lead paste. [Effects of the Invention]

[0007] According to the technology disclosed in this specification, it is possible to manufacture a positive electrode plate for a lead-acid battery having excellent performance while taking advantage of the wet method's advantage of being friendly to the working environment. [Brief explanation of the drawings]

[0008] [Figure 1] Flowchart of the manufacturing process for positive electrode plates for lead-acid batteries [Figure 2] Front view of the blind lattice [Figure 3] A diagram showing the core bar insertion process [Figure 4] Diagram showing the lead paste filling process [Figure 5] 10 is a diagram showing a cleaning process for a cylindrical body. [Figure 6] 10 is a diagram showing a cleaning process for a cylindrical body. [Figure 7] 10A and 10B are diagrams showing a process of attaching a sealing member; [Figure 8] Front view of the positive electrode plate [Figure 9] Flowchart of the manufacturing process for positive electrode plates for lead-acid batteries [Figure 10] Flowchart of the manufacturing process for positive electrode plates for lead-acid batteries DETAILED DESCRIPTION OF THE INVENTION

[0009] (Outline of this embodiment) First, an outline of the method for manufacturing the positive electrode plate disclosed in this embodiment will be described. (1) A method for manufacturing a positive electrode plate for use in a lead-acid battery, comprising: a filling step of filling a cylindrical body having a core metal therein with lead paste; and a cleaning step of cleaning the cylindrical body filled with lead paste. In the method for manufacturing a positive electrode plate described in (1), steps other than the above are optional, and for example, steps other than the above may or may not be included.

[0010] According to the manufacturing method of the positive electrode plate disclosed in this embodiment, when the cylindrical body is filled with lead paste, the lead paste adhering to the surface of the cylindrical body is washed away in a cleaning process. Therefore, when the positive electrode plate manufactured by this manufacturing method is used in a lead-acid battery, the lead paste adhering to the surface of the cylindrical body can be prevented from coming into contact with the negative electrode plate and short-circuiting. As a result, it is possible to provide a manufacturing technology for a positive electrode plate for a lead-acid battery that suppresses short-circuiting between plates and has excellent performance while taking advantage of the wet method's advantage of being friendly to the working environment.

[0011] (2) In the method for producing a positive electrode plate described in (1) above, the cleaning step may be performed simultaneously with the filling step. This method reduces the number of steps compared to when the filling step and the cleaning step are performed separately, thereby increasing the productivity of the positive electrode plate.

[0012] (3) In the method for producing a positive electrode plate according to (1) or (2), the cylindrical body may be washed with water in the washing step. In this method, the cylindrical body is washed with water, which is more environmentally friendly than washing with an acid.

[0013] (4) The method for manufacturing a positive electrode plate described in (3) above may include a drying step of drying the cylindrical body after washing with water. In this manufacturing method, the surface of the cylindrical body is dried in the drying step after washing, so deterioration of the cylindrical body due to moisture adhesion can be suppressed. Note that if moisture adheres, when the positive electrode plate manufactured by this manufacturing method is used in a lead-acid battery, the surface of the cylindrical body may react with the electrolyte (dilute sulfuric acid) and dissolve, which may cause deterioration.

[0014] (5) In the method for manufacturing a positive electrode plate according to any one of (1) to (4), the density of the lead paste filled in the cylindrical body may be 2 to 4 g / cc, and the filling pressure of the lead paste into the cylindrical body may be 0.01 to 0.5 MPa. In this way, the lead paste can be evenly filled into the cylindrical body while reducing stress on the cylindrical body due to filling.

[0015] <Embodiment> 1. Manufacturing method for clad positive electrode plates used in lead-acid batteries This embodiment discloses a method for manufacturing a clad type positive electrode plate 10, which comprises the following six steps (see FIG. 1).

[0016] S10: Core bar insertion process S20: 1st welding process S30: Filling and cleaning process S40: Sealing material installation process S50: Drying process S60: 2nd welding process

[0017] <Core bar insertion process> The core metal 33 insertion step is a step of inserting the core metal 33 of the blind lattice 30 into each of the cylindrical bodies 20 lined up in a row in the X direction. The cylindrical body 20 is a porous tube (cylindrical member) made of an acid-resistant material such as glass fiber or acrylic resin-coated polyester resin. The cylindrical body 20 is a holder that holds lead paste, which is an active material.

[0018] As shown in FIG. 2, the blind lattice 30 comprises a lattice body 31 and a resin portion 37. The lattice body 31 is made of a lead alloy and comprises a first connecting seat 32 and a plurality of cores 33. The first connecting seat 32 is elongated in the X direction and has lugs 32A. The cores 33 are axially elongated in the Y direction and are provided at equal intervals on the first connecting seat 32. The pitch between the cores 33 corresponds to the pitch between the cylindrical bodies 20.

[0019] The resin portion 37 is a resin member that covers the first connecting seat 32. The resin portion 37 is obtained by resin molding such as insert molding.

[0020] As shown in Fig. 3, each core 33 of the blind lattice 30 can be inserted into each cylindrical body 20 from the lower end face (one end face) 20A shown in Fig. 3. The total length (length in the Y direction) of the core 33 is shorter than the total length (length in the Y direction) of the cylindrical body 20, and when insertion is complete, the entire core is contained in the cylindrical body 20, and the resin part 37 of the first connecting seat 32 is in close contact with the end face 20A of the cylindrical body 20.

[0021] <First welding process> The first welding step is a step of melting the resin portion 37 after inserting the core metal 33 and welding the end surface 20A of each cylindrical body 20 to the first connecting seat 32 of the blind grid 30. The welding method may be heat welding or vibration welding.

[0022] <Filling and cleaning process> The filling process is a process in which lead paste is filled into the cylindrical body 20 after the core metal is inserted using a filling machine 40. The lead paste is made by mixing lead powder, sulfuric acid, and water to form a slurry. The slurry is a fluid containing solid particles.

[0023] As shown in Fig. 4, the filling machine 40 comprises a hopper 41, a screw pump 43, a motor 45, and a filling manifold 47. A plurality of filling nozzles 48 are installed at equal intervals on the filling manifold 47. The filling nozzles 48 correspond to each cylindrical body 20, and can be attached to the upper end surface (the other end surface) 20B of the cylindrical body 20.

[0024] After each filling nozzle 48 is attached to the end surface 20B of each cylindrical body 20, lead paste is supplied to the hopper 41, and the motor 45 is driven to pressure-feed the lead paste to the filling manifold 47 using the screw pump 43. This allows the lead paste to be filled into each cylindrical body 20 from each filling nozzle 48.

[0025] The density of the lead paste filled into the cylindrical body 20 (the weight of the lead paste divided by the volume) is 2 to 4 [g / cc], and the filling pressure of the lead paste by the filling machine 40 is 0.01 to 0.5 [MPa]. By setting the density of the lead paste and the filling pressure within the above ranges, the lead paste can be evenly filled into the cylindrical body 20 while reducing stress on the cylindrical body 20 due to filling.

[0026] <Cylindrical body cleaning process> The cleaning process of the cylindrical body 20 is a process of washing away lead paste that has adhered to the surface of the cylindrical body during the filling operation. In this embodiment, as shown in Fig. 5, a cleaning device (not shown) that discharges water as a cleaning liquid is used to fill the cylindrical body 20 with lead paste while spraying a cleaning liquid (specifically, water) onto the cylindrical body 20, and filling the lead paste and cleaning the cylindrical body are carried out simultaneously in the same process. Note that the cleaning device is not particularly limited as long as it is configured to discharge water, and one example is one configured from a water supply pump and a discharge device such as a nozzle.

[0027] The area to be cleaned is the area to which lead paste is likely to adhere during the filling operation, as shown by the dashed line frame W in Fig. 5, specifically the area around the lead paste filling port (the other end surface 20B) of the cylindrical body 20. As shown in Fig. 6, the area to be cleaned can also be the entire cylindrical body.

[0028] In Figure 5, the filling nozzle 48 of the filling manifold 47 is separated from the end face 20B of the cylindrical body 20, but this is just an illustration to make the nozzle easier to understand; in reality, the lead paste is filled with the filling nozzle 48 inserted into the cylindrical body.

[0029] The orientation of the cylindrical body 20 during filling is as shown in FIG. 5. In this embodiment, the cylindrical body 20 is oriented in the vertical direction (standing vertically), and the lead paste is filled from the upper end surface 20B.

[0030] <Sealing member mounting process> The step of attaching the sealing member 50 is a step of attaching the sealing member 50 to the other end surface 20B of the cylindrical body 20 after filling with lead paste.

[0031] The sealing member 50 is made of synthetic resin and consists of a second connecting seat 51 that is elongated in the X direction and caps 53 that are lined up in a row in the X direction. The caps 53 have a convex shape that can fit around the periphery of the cylindrical body and are provided on the second connecting seat 51 at equal intervals.

[0032] As shown in FIG. 7, the sealing member 50 is attached to the other end surface 20B of the cylindrical body 20, with each cap 53 fitted to the inner periphery of each cylindrical body 20.

[0033] <Drying process and second welding process> The drying step is a step of drying the cylindrical body 20 after the sealing member is attached in a drying chamber, etc. As a result, the moisture on the surface of the cylindrical body 20 evaporates, and the cylindrical body 20 becomes dry.

[0034] Thereafter, a second welding step is carried out. The second welding step is a step of melting the second connecting seat 51 of the sealing member 50 and welding the end surface 20B of each cylindrical body 20 to the second connecting seat 51. The welding method may be heat welding or vibration welding.

[0035] After the drying step, the cylindrical body 20 is in a dry state, and since there is no moisture attached to the surface, heat can easily penetrate. As a result, poor welding in the second welding step can be suppressed, and the end surface 20B of the cylindrical body 20 can be sealed more reliably.

[0036] As a result of the above, a clad type positive electrode plate 10 can be obtained in which the cylindrical body 20 is used as a support for the lead paste (see FIG. 8).

[0037] 2.Effectiveness The clad type positive electrode plate 10 is an electrode plate that uses a cylindrical body 20 to hold lead, which is an active material. There are two methods for filling the cylindrical body 20 with lead: dry and wet. The dry method is a method in which lead powder is filled, and the wet method is a method in which lead paste made by mixing lead powder and dilute sulfuric acid is filled.

[0038] The manufacturing method of the positive electrode plate 10 disclosed in this embodiment is a wet method, which has the advantage of generating less dust (lead powder dust leaking from the cylindrical body) during filling and being gentler on the working environment than a dry method.

[0039] Furthermore, according to the manufacturing method of the positive electrode plate 10 disclosed in this embodiment, the lead paste adhering to the surface of the cylindrical body is washed away in a cleaning process during filling. Therefore, when the manufactured positive electrode plate is used in a lead-acid battery, the lead paste adhering to the surface of the cylindrical body can be prevented from coming into contact with the negative electrode plate and causing a short circuit. As a result, it is possible to provide a manufacturing technology for a positive electrode plate for a lead-acid battery that suppresses short circuits between plates and has excellent performance while taking advantage of the wet method's advantage of being gentle on the working environment.

[0040] Furthermore, according to the manufacturing method of the positive electrode plate disclosed in this embodiment, the cleaning process is performed simultaneously with the filling process (see S30 in FIG. 1 and FIG. 5). This reduces the number of processes compared to when the filling process and the cleaning process are performed separately, thereby improving the production efficiency of the clad-type positive electrode plate 10.

[0041] Furthermore, according to the manufacturing method of the positive electrode plate 10 disclosed in this embodiment, the cylindrical body 20 is washed with water, which is more environmentally friendly than washing with acid and reduces manufacturing costs. Moreover, since the surface of the cylindrical body is dried in a drying process after washing, deterioration of the cylindrical body 20 due to moisture adhesion can be suppressed.

[0042] Furthermore, if moisture is present, when the manufactured positive electrode plate is used in a lead-acid battery, it may react with the electrolyte (dilute sulfuric acid) and dissolve the surface of the cylindrical body, causing deterioration.

[0043] <Other embodiments> The technology disclosed in this specification is not limited to the embodiments described above and illustrated in the drawings, and also includes various aspects such as those described below.

[0044] (1) In the above embodiment, a method for manufacturing a clad-type positive electrode plate 10 includes six steps S10 to S60. Among steps S10 to S60, step S10 (insertion step of a core), step S20 (first welding step), step S40 (attachment step), step S50 (drying step), and step S60 (second welding step) are optional steps and may be replaced by another method, performed separately, or omitted. This technique only needs to include at least step S30 (filling and cleaning step), and the other steps may be included or omitted. They may also be replaced by another method.

[0045] (2) In the above embodiment, the cleaning step was performed simultaneously with the filling step (S30 in FIG. 1). The cleaning step may be performed separately from the filling step, such as by performing the cleaning step (S40A shown in FIG. 9) after the filling step. Furthermore, of all the steps (S10 to S70) in FIG. 9, the steps (S10, S20, S50, S60, S70) other than the filling step S30 and the cleaning step S40A are optional steps and may be substituted with other steps, or may be omitted if possible.

[0046] (3) The cleaning step may be performed after the drying step or the second welding step. For example, as shown in Fig. 10, the steps may be performed in the following order: insertion step S10, first welding step S20, filling step S30, mounting step S50, drying step S60, second welding step S70, and cleaning step S40B. In this case, since cleaning is performed after drying, it is preferable to use an acidic cleaning solution.

[0047] (4) In the above embodiment, the density of the lead paste filled into the cylindrical body 20 is 2 to 4 [g / cc], and the filling pressure of the lead paste into the cylindrical body 20 is 0.01 to 0.5 [MPa]. The above ranges are examples, and the density and filling pressure of the lead paste filled into the cylindrical body 20 may be values ​​outside the ranges.

[0048] (5) Furthermore, the cylindrical body 20 is not limited to the form shown in the embodiment, and may be a linked type in which the cylindrical bodies are integrated with each other. In the case of the linked type, the material of the cylindrical body 20 may be a resin such as polyester.

[0049] (6) In the above embodiment, the blind lattice 30 is provided with a resin portion 37, but the resin portion 37 may be omitted. In this case, instead of welding, the cylindrical body 20 can be fixed to the lattice body 31 by thickening the base of the core metal 33 and, when the cylindrical body 20 is inserted into the core metal 33, bringing the cylindrical body 20 into close contact with the base of the core metal 30. Even when a resin portion is provided, the cylindrical body 20 can also be fixed to the lattice body 20 by the above method without welding.

[0050] (7) In the above embodiment, in S30, the cleaning step of the cylindrical body 20 is performed in the same step as the lead paste filling step, and the cylindrical body 20 is washed with water. Instead of water, washing with an acidic liquid may be performed. The same applies when a cleaning step is performed after the filling step.

[0051] (8) In the above embodiment, in the second welding step (S60 in FIG. 1), the sealing member 50 is heat-welded to the cylindrical body 20. However, a configuration may be adopted in which the cap 53 is inserted into the cylindrical body 20 and fixed thereto, without heat welding. [Explanation of symbols]

[0052] 10: Positive electrode plate 20: Cylindrical body 30: Blind lattice 31: Lattice body 32: First Conspiracy 33: Core 37: Resin part 40: Filling machine 41: Hopper 43: Screw 45: Motor 47: Filling manifold 50: Sealing member 51: Second Conspiracy 53: Cap

Claims

1. A method for manufacturing a positive electrode plate used in a lead-acid battery, comprising: a filling step of filling a cylindrical body having a core metal therein with lead paste; A method for manufacturing a positive electrode plate, comprising a cleaning step of cleaning the cylindrical body filled with lead paste.

2. The method for manufacturing a positive electrode plate according to claim 1, The method for manufacturing a positive electrode plate, wherein the cleaning step is performed simultaneously with the filling step.

3. The method for manufacturing a positive electrode plate according to claim 1 or 2, The method for manufacturing a positive electrode plate, wherein the cylindrical body is washed with water in the washing step.

4. The method for manufacturing a positive electrode plate according to claim 3, A method for manufacturing a positive electrode plate, comprising a drying step of drying the cylindrical body after washing with water.

5. The method for manufacturing a positive electrode plate according to claim 1 or 2, The density of the lead paste filled in the cylindrical body is 2 to 4 [g / cc], and the filling pressure of the lead paste to the cylindrical body is 0.01 to 0.5 [MPa].

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