JP3343783B2 - Electrode enclosing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for encapsulating an electrode plate which is used when enclosing an electrode plate of an electrode group used for a lead storage battery by enclosing the electrode plate in a separator.

[0002]

2. Description of the Related Art Generally, an electrode group used for a lead-acid battery is formed by alternately stacking a plurality of positive electrodes and negative electrodes. Particularly, in a sealed lead-acid battery, a positive electrode plate is used to prevent a short circuit between the electrodes. The plate is wrapped with a U-shaped separator made of synthetic resin, and a plurality of such positive electrode plates and negative electrode plates are alternately laminated to form an electrode group, and this electrode group is inserted into each cell of the battery case. I have to.

[0003] The operation of wrapping the positive electrode plate with the separator is performed by using automatic equipment, and FIG. 4 schematically shows the wrapping process procedure. Separator 1 is roll 2
Sent out from. A fold jig 3 is provided above the portion of the separator 1 sent from the roll 2, and the fold jig 3 is fixed at a constant pressure (0.2 to 0.3) using an air cylinder or the like (not shown). kg / cm ² ) against the middle of the separator 1 in the width direction.

[0004] By pressing the fold jig 3, a fold line L is formed on the separator 1 as a bending habit. The separator 1 with the fold line L is cut to a predetermined size set in the cutting section 4.

[0005] The cut separator 1 is transferred to a transport pallet section 5 using an attraction plate, and transported in one direction.
Then, during this transport, the positive electrode plate 6 is placed on one side of the separator 1 at the boundary of the fold line L. After this,
The other side of the separator 1 bordering on the fold line L is bent upward by 90 ° along the fold line L, and further bent to 180 °, whereby the separator 1 is formed into a U-shape. Then, the positive electrode plate 6 is wrapped.

As shown in FIG. 5, the conventional folding jig 3 has a plate shape having a thickness t of less than 1 mm, and the lower end surface of the folding jig 3 is pressed against the surface of the separator 1 to make a fold line L Is formed.

[0007]

However, the thickness of the positive electrode plate 6 wrapped by the separator 1 is 1 mm or more.
For this reason, the thickness of the positive electrode plate 6 is larger than the width of the fold line L. As a result, the line when the separator 1 is bent is displaced from the edge of the positive electrode plate 6, and as a result, as shown in FIG.
As shown in (2), both edges of the separator 1 become irregular,
A vertical deviation G of ± 1 mm or more may occur, and the separator may be damaged at the bent portion, which may cause a short circuit. In addition, 7 shown in FIG. 6 is a negative electrode plate.

Therefore, it is conceivable to make the thickness t of the fold jig 3 equal to or greater than the thickness of the positive electrode plate 6, but if the thickness of the fold jig 3 is simply increased, When the fold line L is formed by pressing the surface of the separator 1 with the tool 3, the contact area increases and a clear fold line L cannot be formed. As a result, the actual bent portion is not stable, May be uneven, and the bent portion may be damaged to cause a short circuit.

As shown in FIG. 7, a folding jig 3 having an arc-shaped cross section at the lower end may be used. In this case as well, the surface in contact with the separator 1 is arc-shaped. Therefore, a clear fold line L cannot be formed, and therefore, also in this case, the actual bent portion is not stable,
There is a possibility that both edges of the separator 1 become irregular, and a break occurs at the bent portion, which may cause a short circuit.

The present invention has been made in view of such a point. An object of the present invention is to enable a separator to be bent accurately along a fold line and to place the bent portion at the end of an electrode plate. An object of the present invention is to provide a method of enclosing an electrode plate that can accurately wrap the electrode plate by precisely matching the edge.

[0011]

In order to achieve such an object, the present invention presses a fold jig against a separator to form a fold line, and folds the separator in two along the fold line. In the method of wrapping and enclosing the electrode plate inside, in the folding jig, the pressing surface against the separator, two parallel and mutually parallel separation width is greater than the thickness of the electrode plate to be encapsulated A ridge is provided, and the ridge of the folding jig is pressed against the separator to make a fold line.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 shows a fold jig 3 used in the present invention. The fold jig has a rectangular plate shape, and its lower end surface, that is, a pressing surface against the separator 1, has two folds. The ridge 3a is formed integrally. Each of the ridges 3a has a rectangular cross section, and extends in the longitudinal direction of the lower end surface of the folding jig 3 in parallel with each other.

For example, the protruding height A of each ridge 3a is 1.5 mm, the width B of each ridge 3a is 0.75 mm, the separation C between the two ridges 3a is 1.8 mm, and the fold 3a is folded. Eye jig 3
Is a metal such as iron.

On the other hand, the thickness of the positive electrode plate constituting the electrode plate group is
1.8 mm, which is equivalent to the separation C between the two ridges 3a, the thickness of the negative electrode plate is 1.4 mm, and the thickness of the separator is 1.0 mm.

The step of forming a fold line on the separator 1 by using the fold jig 3 is the same as the step shown in FIG. 4, and the protrusion 3a of the fold jig 3 is provided on the surface of the separator 1 sent out from the roll 2. With a constant pressure (0.2 to 0.3 kg / cm ² ) using an air cylinder or the like (not shown). As a result of this pressing, two parallel fold lines L1 and L2 corresponding to the ridges 3a of the fold jig 3 are formed on the separator 1 as shown in FIG.

Thereafter, the separator 1 on which the fold lines L1 and L2 are formed is cut to a predetermined size set in the cutting section 4. Then, the cut separator 1 is transferred to the transport pallet unit 5 using the suction plate, and transported in one direction. During this conveyance, the positive electrode plate 6 is placed on one side of the separator 1 at the boundary of the fold line L1 as shown by a chain line in FIG.
Are placed, and then the separator 1 is connected to the fold lines L1 and L1.
2 to wrap the positive electrode plate 6.

Each of the ridges 3a of the folding jig 3 has a very small width B. Therefore, when the ridges 3a are pressed against the separator 1, the contact area between the ridges 3a and the separator 1 is very small. The fold lines L1 and L2 formed by the pressing are sharp and have a strong tendency to bend. The distance between one parallel fold line L1 and the other fold line L2 is equivalent to the thickness of the positive electrode plate 6.

For this reason, the separator 1 has the fold lines L1, L2
When the separator 1 is bent along, the separator 1 bends exactly within the width of the fold lines L1 and L2, and the bent portion exactly matches the edge of the positive electrode plate 6, and as shown in FIG. In addition, both edges of the bent separator 1 are aligned with each other, almost no vertical displacement occurs, and the accuracy of wrapping is reliably improved. According to the actual measurement, the vertical deviation could be suppressed to within ± 0.5 mm, and the failure to prevent short circuit in the subsequent process could be drastically reduced.

In the above embodiment, the ridge 3a is used.
Although the separation width C between them is made equal to the thickness of the positive electrode plate 6, the same effect can be obtained even when it is made larger than the thickness of the positive electrode plate 6.

[0021]

As described above, according to the present invention,
The separator can be bent exactly along the fold line, and the bent part can be precisely matched with the edge of the electrode plate. It can be wrapped around, and the cause of the short circuit can be reliably eliminated.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a folding jig according to an embodiment of the present invention.

FIG. 2 is a plan view showing a state where a fold line is formed on a separator by the fold jig.

FIG. 3 is a sectional view showing a state in which a positive electrode plate is encapsulated by the separator.

FIG. 4 is a perspective view schematically showing a process procedure of enclosing the positive electrode plate with a separator.

FIG. 5 is a perspective view showing a conventional folding jig.

FIG. 6 is a cross-sectional view showing a conventional positive electrode plate in an encased state.

FIG. 7 is a perspective view showing another example of a conventional folding jig.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Separator 3 ... Folding jig 6 ... Positive electrode L1, L2 ... Fold line

Continuation of the front page (56) References JP-A-60-133654 (JP, A) JP-A-2000-306596 (JP, A) Jikken Sho 45-6656 (JP, Y2) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01M 10/14

Claims (1)

(57) [Claims] 1. A method of pressing a fold jig against a separator to form a fold line, folding the separator in two along the fold line, and enclosing and enclosing an electrode plate inside the separator. On the pressing surface against the separator, two ridges that are parallel to each other and whose parallel separation width is equal to or greater than the thickness of the electrode plate to be covered are provided, and the ridges of the folding jig are pressed against the separator. A method for enclosing an electrode plate, wherein a folding line is provided.