JP5136089B2 - Lead acid battery - Google Patents

Description

  The present invention is an electrode plate for a lead storage battery and a manufacturing apparatus related thereto.

  As a method of manufacturing a lead storage battery electrode plate, the expand method of filling a paste that becomes an active material while producing a mesh-like lattice by meshing a belt-like lead sheet can continuously manufacture the electrode plate It is excellent in productivity and has been widely adopted in recent years.

  As a forming method of the electrode plate and electrode plate current collector in the expand method, first, punching is performed using a press or the like with a specified length so that the central part in the width direction of the strip-shaped lead sheet is the current collector part of the electrode plate Then, an expanding process is performed in both width directions of the belt-like lead sheet to continuously form a mesh portion. This is a method in which a continuous body in which the mesh portion is filled with an active material paste is cut into unit electrode plates with a rotary cutter.

  However, in the conventional method, since the cutting process has two steps of punching before paste filling and cutting into unit electrode plates, each facility is required. Rotary cutters have been used that simultaneously perform processing. When these two stages of processing are performed at the same time, the longitudinal direction and the lateral direction of the continuous body are cut at the same time, so that distortion occurs at the time of cutting, which causes the produced electrode plate to bend. Due to the curvature of the electrode plate, the upper current collector portion of the electrode plate has a phenomenon that the bent portion penetrates through the separator and is short-circuited particularly when an electrode plate group having a short distance between the electrode plates is formed. .

For example, Patent Document 1 discloses a method of producing a pole plate by punching a pole plate when a pair of a die cylinder (A) and a die cylinder (B) is rotated and the blades overlap each other while rotating. Moreover, by configuring the die cylinders to have different blade widths, the stress from one side is not applied during cutting, so that the projections of the lattice are removed and the curvature of the electrode plate is reduced. It is described.
Japanese Patent Laid-Open No. 10-208736

  However, the upper frame bone of the electrode plate may cause a short circuit by penetrating the separator due to electrode plate deformation caused by lattice corrosion even when the battery is actually used. If present, the capacity is deteriorated at an early stage. Therefore, a high dimensional accuracy has been demanded when processing these plates. For this reason, it was made into the subject to make a highly accurate electrode plate from the continuous body after paste filling using an expand system, and to obtain a reliable lead storage battery, without changing a conventional installation significantly.

  In order to solve the above-mentioned problems, the invention according to claim 1 is directed to forming a continuous body by filling a net-like portion obtained by continuously processing a part of a strip-shaped lead sheet with an active material paste, and a die cylinder and an anvil. When the continuous body is cut into unit electrode plates by combining cylinders, the cross-sectional angle of the blade provided in the die cylinder for cutting the upper frame bone and the plain portion is set to the angle on the upper frame bone side with respect to the blade axis. The electrode plate for a lead storage battery cut by a blade provided in the die cylinder where α <β, where α is an angle on the plain portion side and β is β.

In the invention according to claim 2, the cross section of the blade on the upper frame side with respect to the blade axis provided on the die cylinder is such that the angle of the tip of the blade with respect to the blade axis is α ₁ and the angle on the die cylinder side is α ₂ . In this case, the electrode plate for a lead storage battery cut by a blade satisfying α ₁ <α ₂ is shown.

  According to a third aspect of the present invention, there is provided an apparatus for continuously processing a part of a belt-like lead sheet to fill a mesh portion with an active material paste to form a continuous body, a die cylinder and an anvil for cutting into unit electrode plates In the cutting device combined with a cylinder, when the cross-sectional angle of the blade for cutting the upper frame bone and the plain portion is α, the angle on the upper frame bone side with respect to the blade axis is α, and the angle on the plain portion side is β The manufacturing apparatus of the electrode plate for lead acid batteries provided with the die cylinder which is <(beta) is shown.

  According to the lead plate for a lead storage battery of the present invention and the manufacturing equipment related thereto, it is possible to suppress the deformation that occurs in the upper frame bone that contributes to the early capacity deterioration of the battery without significantly changing the conventional equipment. Since a unit electrode plate with higher accuracy than that of the electrode plate continuum can be manufactured, a highly reliable electrode plate for a lead storage battery is obtained.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a state diagram in which a strip-shaped lead sheet is continuously processed. Here, a strip-shaped lead sheet using a lead alloy of calcium 0.08% and tin 0.8%, having a width of 85 mm and a thickness of 1.3 mm, has a plain portion 1 having a width of 26 mm at the center and both sides thereof. A net-like portion 2 developed by expanding is continuously formed in the traveling direction. FIG. 2 is a state diagram in which the paste is continuously filled. A continuous body 4 having a width of 300 mm having a paste filling portion 3 continuously filled with a paste that finally becomes an active material is formed in the mesh-like portion 2 other than the plain portion 1 formed continuously. To do.

  FIG. 3 is a state diagram in which the unit electrode plate is cut from the continuum, and FIG. 4 is a schematic diagram showing an apparatus for cutting the unit electrode plate.

  The unit electrode plate 5 is formed by cutting from both sides of the continuous body 4, but the current collecting ear portions 6 of the unit electrode plates 5 on both sides are alternately contacted to obtain both electrode plate ear portions by one cutting operation. It is desirable to arrange so that Therefore, the plain portion 1 corresponds to the current collecting ear portion 6, the punched portion 7 and the upper frame bone 8 corresponding to both sides of the continuous body 4, and the punched portion is remelted and newly used as a strip-shaped lead sheet. Is done. On the other hand, the cutting part 9 of the unit electrode plate 5 of the paste filling part 3 is arranged in a straight line in a direction perpendicular to the traveling direction of the continuum 4 by providing current collecting ear parts 6 corresponding to the electrode plates on both sides at adjacent positions. Instead, they exist alternately.

  In FIG. 4, a rotary cutter 10 as a cutting device is configured by a combination of a die cylinder 11 and an anvil cylinder 12 each having a diameter of 200 mm, and a blade for cutting a unit electrode plate 5 from a continuous body 4 on the surface of the die cylinder. 13 is provided. The continuous body 4 is fed into a rotating rotary cutter 10, and the paste filling portions 3 on both sides of the continuous body are cut by the blades of the die cylinder 11, and the current collecting ear portions 6 of the plain portion 1 are cut and formed while being cut. Part 7 is removed from the plain part. Here, the surface of the anvil cylinder 12 may be a flat surface, but a blade having a width wider than the blade of the die cylinder 11 may be provided in consideration of the curvature of the electrode plate.

  FIG. 5 is a state diagram of the unit electrode plate. The unit electrode plate 5 cut from the continuous body 4 by the rotary cutter 10 mainly includes a paste filling portion 3, an upper frame bone 8, and a current collecting ear portion 6 connected to the upper frame bone.

  FIG. 6 is a diagram showing a cross-sectional shape of a blade for cutting the unit electrode plate. It is sectional drawing of the blade 13 corresponding to the advancing direction of the continuous body 4, (a) is sectional drawing of the blade by this invention, (b) is sectional drawing of the blade in the other Example by this invention.

  FIG. 6A shows a cross-sectional shape of the blade 13 provided on the die cylinder 11 in order to form the upper frame bone 8 from the plain portion 1 of the continuous body 4. The cross-section of the blade 13 is such that the cross-sectional angle with respect to the blade axis 14 is α, the angle on the upper frame bone 8 side is α, and the angle on the plain portion 1 side is β. Set smaller than the angle.

  In this way, it is possible to obtain a high dimensional accuracy in the upper frame bone by making α <β instead of making the angle symmetrical, and further reducing α so that the cross section of the upper frame bone 8 approaches a right angle. . On the other hand, since the cross-sectional area of the blade can be secured by increasing the angle of β as the angle of α decreases, the strength of the blade can be maintained.

FIG. 6B is a cross-sectional view of another blade 13 existing in the die cylinder 11. Similarly, the cross-sectional angle with respect to the blade axis 14 is α, and the angle on the upper frame bone 8 side is α. Similarly, when the angle on the side is β, the relationship α <β holds similarly, and the angle α on the upper frame bone side is α ₁ for the tip 15 of the blade and α ₂ for the die cylinder side. In this case, the angle of the tip 15 of the blade is set to be smaller than the angle on the die cylinder 11 side. At this time, the upper frame bone 8 can be cut well by setting the height h of the tip portion α ₁ of the blade to be equal to or greater than the thickness of the plain portion 1 to be cut.

That is, the unit electrode plate 5 with high dimensional accuracy is obtained by cutting the upper frame bone 8 near the right angle by making the blade having a shape with an angle to the blade axis 14 α ₁ <α _2. Can be obtained. Furthermore, since the angle α ₂ of the blade on the die cylinder 11 side can be widely held, the strength of the entire blade can be obtained.

  Next, the die cylinder blades with different angles are prepared, and the plain part is punched out from the electrode plate continuum, the upper frame bone is 2 mm in height and 1.3 mm in thickness, and the unit electrode plate is 120 mm in height. The width was 110 mm and the thickness was 1.2 mm. The presence or absence of electrode plate deformation and the durability of the blades in these unit electrode plates were investigated.

Example 1
Regarding the presence or absence of electrode plate deformation, the angle α of the upper frame bone side with respect to the blade axis is changed to 1 °, 5 ° and 30 °, and the angle β of the blade on the plain side is set to 30 °. A die cylinder was prepared. Place the unit plate obtained by continuously processing 1000 sheets each using these die cylinders on a plane, measure the difference between the maximum height and the minimum height of each side of the plate and measure the four sides of each plate The maximum value at was taken as the amount of deformation of the electrode plate. These combinations and the test results are shown in Table 1.

  From the results shown in Table 1, it can be said that when the angle of the blade with respect to the blade axis is α <β, a result of suppressing the electrode plate deformation is obtained, and in particular, the electrode plate deformation decreases as the angle decreases. This is because when the blade provided in the die cylinder tries to cut the plain part of the electrode plate continuum, the body volume of the blade tends to be replaced by this, and the upper frame bone is deformed. It is. For this reason, it is desirable that the angles α and β of the blades are small. However, if the angles α and β are too small, the physical strength of the blade provided in the die cylinder is lowered, and the durability of the blade is affected.

  Therefore, the angle of (α + β) is easily affected by the thickness and rotation speed of the electrode cylinder continuum of the die cylinder, and there are some parts that cannot be generally stated. However, while maintaining a predetermined strength, In the unacceptable range, the angle α on the electrode plate side is reduced, and the angle β on the plain part side that is not used as a product after being punched is relatively increased, so that deformation of the electrode plate side is suppressed while ensuring the durability of the blade. It becomes possible to do.

  In this test, the angle of β is kept constant at 30 °, but there is no particular limitation, and there is a degree of freedom in design. Thus, the material used for the die cylinder is not limited, and the angle of (α + β) also affects the material used for the die cylinder. However, in the steel materials of 1% carbon and 8% chromium used in the present invention, 30 As long as it was above about °, practical blade durability could be secured.

(Example 2)
Further, from the results of the above test results, the angle of the blade provided in the die cylinder with respect to the blade axis is α <β. A blade with varying angle α ₁ and angle α ₂ closer to the die cylinder was prepared and tested for durability. Here too, the angle β of the blade on the plain portion side was set to 30 °.

  The durability of the blade was continuously operated at a processing speed of 250 sheets / minute, and the period from the start of use until the breakage of the blade was measured. The test results are shown in Table 2.

As a result, by increasing the angle α ₂ closer to the die cylinder than the angle α ₁ of the tip of the die cylinder blade, the cross-sectional area near the root of the die cylinder and the blade can be secured, so that the blade Durability is improved. Although there is no restriction | limiting in the angle of (alpha) ₁ , Although the deformation | transformation of the electrode plate at the time of a cutting | disconnection can be suppressed and the high dimensional accuracy can be acquired, so It is preferable to do this.

The height of the cutting edge of the angle alpha ₁ from the angle alpha ₁ of the tip portion of the blade until it shifts to the angle alpha ₂ h is preferably the same as either or greater than the plate thickness for cutting. If the height h of the angle α ₁ at the tip of the blade is less than the thickness of the electrode plate, it will affect the deformation of the electrode plate, and the effect of the present invention cannot be exhibited. On the other hand, if the height h of the angle α ₁ of the blade tip is set more than necessary, the physical strength of the blade itself is lowered, resulting in deterioration of the durability of the blade.

  According to the configuration of the present invention, an electrode plate for a lead storage battery with high accuracy can be provided from a continuous body of expanded electrode plates without significantly changing the conventional equipment, which is extremely useful industrially.

State diagram of continuous processing of strip-shaped lead sheet State diagram of continuous filling with paste State diagram with unit electrode cut from continuum Schematic diagram showing a device for cutting unit plates Phase diagram of unit plate The figure which shows the cross-sectional shape of the blade which cut | disconnects the unit electrode plate of this invention ((a) Cross-sectional shape figure of the blade of this invention, (b) Cross-sectional shape figure of the blade in the other Example of this invention)

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Plain part 2 Reticulated part 3 Paste filling part 4 Continuum 5 Unit electrode plate 6 Current collecting part 7 Punching part 8 Upper frame bone 9 Cutting part 10 Rotary cutter 11 Die cylinder 12 Anvil cylinder 13 Blade 14 Blade axis 15 Tip

Claims (3)

When a continuous body is formed by filling an active material paste into a net-like portion obtained by continuously processing a part of a strip-shaped lead sheet, and when the continuous body is cut into unit electrode plates by combining a die cylinder and an anvil cylinder, When the cross-sectional angle of the blade provided in the die cylinder that cuts the upper frame bone and the plain portion is α, the angle on the upper frame bone side with respect to the blade axis is α, and the angle on the plain portion side is β, α <β An electrode plate for a lead storage battery, characterized by being cut by a blade provided on the die cylinder. The cross section of the blade on the upper frame bone side with respect to the blade axis provided on the die cylinder is α ₁ <α when the angle of the tip of the blade with respect to the blade axis is α ₁ and the angle on the die cylinder side is α _{2. The} electrode plate for a lead storage battery according to claim 1, wherein the electrode plate is cut by a blade that is ₂ . In a device that continuously processes a part of a belt-like lead sheet and fills a mesh portion with an active material paste to form a continuous body, and a cutting device that combines a die cylinder and an anvil cylinder that cut into unit electrode plates, A die cylinder in which the cross-sectional angle of the blade for cutting the upper frame bone and the plain portion is α <β, where α is the angle on the upper frame bone side and β is the angle on the plain portion side with respect to the blade axis. An apparatus for producing an electrode plate for a lead storage battery.

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