JP4729851B2 - Lead acid battery - Google Patents

Description

  The present invention comprises a wound-type electrode plate group in which a positive electrode plate and a negative electrode plate each having a plurality of ears projecting are wound through a separator, and the tips of the plurality of ear parts for each polarity correspond to each other The present invention relates to a lead storage battery connected by a positive polarity strap and a negative polarity strap.

  As shown in FIGS. 5 and 6, the conventional cylindrical lead-acid battery includes a wound-type electrode plate group 4 in which a belt-like positive electrode plate 1 and a negative electrode plate 2 are wound through a belt-like separator 3. Yes.

  The positive electrode plate 1 and the negative electrode plate 2 each have a plurality of ears 1a, 2a projecting in a direction perpendicular to the winding direction, and these ears 1a, 2a are polar at the end face of the wound electrode plate group 4. Separately, they are arranged in a straight line.

  Moreover, the ear | edge parts 1a and 2a are formed in the curved surface curved from the root to the front-end | tip so that the winding center side may become concave according to the curvature of the electrode plate of the part.

  The electrode plate group 4 is connected to the tip of each ear 1a of the positive electrode plate 1 and the tip of each ear 2a of the negative electrode plate 2 by a corresponding positive electrode strap 5 and negative electrode strap 6 (see FIG. 7). (For example, refer to Patent Document 1).

As shown in FIG. 7, the positive strap 5 and the negative strap 6 are inserted into the mold grooves 8 and 9 of the mold 7 with the tips of the positive and negative ears 1a and 2a by COS (Cast on Strap) method. In addition, a molten lead alloy is cast into each of the mold grooves 8 and 9, and the tips of the ears 1a and 2a are connected to each other for each polarity.

Although the positive electrode plate 1 and the negative electrode plate 2 as described above have a long band shape, FIG. 8 schematically shows the longitudinal direction compressed. The positive electrode plate 1 and the negative electrode plate 2 are obtained by holding an active material in a long band-like lead or lead alloy positive electrode grid-like current collector 10 and negative electrode grid-like current collector 11 by a conventional method. In the grid-shaped current collectors 10 and 11, grids 14 are formed by horizontal bones 12 in the longitudinal direction and vertical bones 13 in the width direction. When wound, the lateral length L1 of the lattice 14 located on the inner peripheral side of the electrode plate group 4 is larger than the longitudinal length L2 of the lattice 14 (L1> L2), and the lateral length L1 of the lattice 14 Is larger than the width W1 of the ears 1b, 2b located on the inner peripheral side of the electrode plate group 4 when wound (L1> W1). Further, the width of the longitudinal bone 12 in the longitudinal direction and the width of the longitudinal bone 13 in the width direction are the same, and further, four locations on the outer peripheral side and the inner peripheral side when the grid-shaped current collectors 10 and 11 are wound. The corner 15 is formed at a right angle.
JP 2002-157991 A

  However, in the wound-type electrode plate group 4 in which the positive electrode plate 1 and the negative electrode plate 2 having the conventional band-shaped grid-shaped current collectors 10 and 11 are wound through the band-shaped separator 3, the curvature of the electrode plate group 4 is increased. The lateral length L1 of the lattice 14 located on the inner peripheral side having a large length is larger than the longitudinal length L2 (L1> L2), and the lateral length L1 of the lattice 14 is located on the inner peripheral side of the electrode plate group 4 Since the width 1 is larger than the width W1 of the portions 1b and 2b (L1> W1), the active material is easily peeled and dropped from the lattice 14, and current collection from the active material is obstructed, and the ear portions 1b and 2b There is a problem that the number of the vertical bones 13 for collecting current in the direction is limited and the current collecting effect is impaired.

  Further, in the conventional strip-shaped grid-shaped current collectors 10, 11, the widths of the horizontal bone 12 in the longitudinal direction and the vertical bone 13 in the width direction are the same. The tensile strength in the direction tends to be insufficient, and when the electrode plate group 4 is wound, the grid-shaped current collectors 10 and 11 are strain-deformed, and the active material is peeled off or dropped from the grids 14. In combination with the four corners 15 of the current collectors 10 and 11 being formed at right angles, there is a concern that a minute short circuit may occur between the electrode plates 1 and 2.

  An object of the present invention is to obtain a lead-acid battery having a structure excellent in a current collecting effect, in which an active material is hardly peeled off or detached from a grid-shaped current collector on an inner peripheral side of a wound electrode plate group. .

 Another object of the present invention is to reduce the strain deformation of the grid current collector during winding of the electrode plate group, and to prevent the active material from peeling and dropping from the grid current collector or causing internal short circuit. It is to obtain a storage battery.

  The present invention comprises a wound-type electrode plate group in which a positive electrode plate and a negative electrode plate each having a plurality of ears projecting are wound through a separator, and the tips of the plurality of ear parts for each polarity correspond to each other It is intended for lead-acid batteries that are connected by positive and negative polarity straps.

In the lead storage battery according to the present invention, the positive electrode plate and the negative electrode plate are obtained by holding an active material in a grid-shaped current collector made of long strip-shaped lead or lead alloy, and the at least one electrode plate The grid-shaped current collector is a grid formed by a horizontal bone in the longitudinal direction and a vertical bone in the width direction, and the horizontal length of the grid located on the inner peripheral side of the electrode plate group is not longer than the vertical length. It has become.

Further, in the present invention, the plurality of ears are protruded at wider intervals toward the outer peripheral side of the wound, and the width of the plurality of ears is formed larger toward the outer peripheral side of the wound. The horizontal length of the lattice located on the inner peripheral side of the plate group is equal to or smaller than the width of the ear portion located on the inner peripheral side.

Moreover, in this invention, it is preferable that the width | variety of the said horizontal bone of the said grid | lattice-like collector is larger than the width | variety of the said vertical bone.

  Moreover, it is preferable that the corner | angular part of the inner peripheral side of the said grid | lattice-type grid | lattice-like collector is formed in the obtuse angle or the curve shape.

  In the lead-acid battery of the present invention, the positive electrode plate and the negative electrode plate are obtained by holding an active material on a grid-shaped current collector made of a long strip of lead or lead alloy, and the grid-shaped current collector of at least one electrode plate The body has lattices formed by longitudinal bones in the longitudinal direction and longitudinal bones in the width direction, and the lateral length of the lattices located on the inner peripheral side of the electrode plate group is less than the longitudinal length. The distance between the longitudinal bones is narrowed on the inner circumference side where the curvature of the plate group is large, and the number of longitudinal bones for collecting current in the direction of the ears can be increased, which makes it difficult for the active material to peel and fall off from the lattice. The current collecting effect can be prevented from being impaired.

Particularly in the present invention, since a less width of ears located on the inner peripheral side horizontal length of the grid network located on the inner peripheral side of the electrode plate group, with a large inner circumferential side of the curvature of the electrode plate group The vertical bone spacing can be narrowed to increase the number of vertical bones for current collection in the direction of the ear, so that the active material is less likely to peel off or fall off from the lattice, and the current collection effect is not impaired. can do.

  Further, when the width of the horizontal bone of the grid-shaped current collector is larger than the width of the vertical bone, the tensile strength in the longitudinal direction of the grid-shaped current collector can be secured, and the grid-shaped current collector can be secured when the electrode plate group is wound. Strain deformation of the electric body is suppressed, and the active material is less likely to be peeled / dropped off from the lattice, so that current collection from the active material can be prevented from being hindered.

  In addition, if at least the corners on the inner peripheral side of the grid-shaped current collector are formed in an obtuse angle or a curved shape, even if strain deformation occurs in the grid-shaped current collector when the electrode plate group is wound, The corners of the current collector are less likely to bite into the separator, so that the occurrence of minute shorts between the electrode plates can be prevented.

  Furthermore, if the width of the ear portion is larger on the outer peripheral side of the winding, the electrical resistance per unit length becomes relatively uniform on the inner peripheral side and the outer peripheral side. It is possible to prevent the current flowing from the ears formed at a wide interval from flowing to the entire electrode plate from becoming uneven on the inner and outer circumferences.

  In the best mode for carrying out the present invention, a positive electrode plate and a negative electrode plate each having a plurality of ears projecting are provided, and a wound electrode plate group is wound through a separator. In lead-acid batteries that are connected by positive and negative polarity straps with the corresponding tips at the ends of the ears, the positive and negative plates are held by a long strip of lead or lead alloy grid-type current collector. The grid-shaped current collector of at least one of the electrode plates has a grid formed by longitudinal bones in the longitudinal direction and longitudinal bones in the width direction, and is located on the inner peripheral side of the electrode plate group The lateral length of the lattice is equal to or less than the longitudinal length, and the lateral length of the lattice located on the inner peripheral side of the wound electrode group is equal to or smaller than the width of the ear portion positioned on the inner peripheral side. And the width of the horizontal bone of the grid-shaped current collector is larger than the width of the vertical bone, and the wound grid shape The corners on the inner circumference side of the electric body are formed in an obtuse angle or a curved shape, and the plurality of ears are projected at wider intervals toward the outer circumference side of the winding, and the width of the plurality of ears is wound. The outer peripheral side is formed larger.

  In such a lead storage battery, the positive electrode plate and the negative electrode plate are obtained by holding an active material on a grid-shaped current collector made of long strip-shaped lead or lead alloy, and the grid-shaped current collector of at least one electrode plate. The electrical body is a lattice formed by a longitudinal bone in the longitudinal direction and a longitudinal bone in the width direction, and the lateral length of the lattice located on the inner peripheral side of the electrode plate group is less than the longitudinal length, The distance between the longitudinal bones is narrowed on the inner circumference side where the curvature of the electrode plate group is large, and the number of longitudinal bones for collecting current in the direction of the ear can be increased. Moreover, the current collecting effect can be prevented from being impaired.

  In addition, since the horizontal length of the lattice located on the inner peripheral side of the electrode plate group is equal to or less than the width of the ear portion positioned on the inner peripheral side, the longitudinal bone interval is larger on the inner peripheral side where the curvature of the electrode plate group is large. As a result, the number of longitudinal bones for collecting current in the direction of the ears can be increased, so that the active material is less likely to peel and drop off from the lattice, and the current collecting effect can be prevented from being impaired.

  In addition, since the width of the horizontal bone of the grid-shaped current collector is larger than the width of the vertical bone, the tensile strength in the longitudinal direction of the grid-shaped current collector can be secured, and the grid-shaped current collector is wound when the electrode plate group is wound. Strain deformation of the electric body is suppressed, and the active material is less likely to be peeled / dropped off from the lattice, so that current collection from the active material can be prevented from being hindered.

  In addition, since at least the corners on the inner peripheral side of the grid-shaped current collector are formed in an obtuse angle or a curved shape, even if strain deformation occurs in the grid-shaped current collector when the electrode plate group is wound, The corners of the current collector are less likely to bite into the separator, so that the occurrence of minute shorts between the electrode plates can be prevented.

  Furthermore, since the width of the ear portion is larger on the outer peripheral side of the winding, the electric resistance per unit length becomes relatively uniform on the inner peripheral side and the outer peripheral side, and for this reason, on the outer peripheral side of the winding It is possible to prevent the current flowing from the ears formed at a wide interval from flowing to the entire electrode plate from becoming uneven on the inner and outer circumferences.

  1 to 4 show an embodiment of a cylindrical lead-acid battery according to the present invention. FIG. 1 is a perspective view showing an electrode plate group of the cylindrical lead-acid battery of this example, and FIG. FIG. 3 is a plan view showing a state of a plurality of ears protruding from the end face of the example electrode plate group, and FIG. 3 is a state in which a strap is formed by the COS method at the tips of the plurality of ear parts protruding from the end face of the example electrode group. FIG. 4 is a schematic development view of an electrode plate used in the electrode plate group of this example. Note that portions corresponding to those in the conventional example shown in FIGS. 5 to 8 are denoted by the same reference numerals.

  As shown in FIGS. 1 and 2, this cylindrical lead-acid battery includes a wound-type electrode plate group 4 in which a belt-like positive electrode plate 1 and a negative electrode plate 2 are wound through a belt-like separator 3. .

  On the positive electrode plate 1 and the negative electrode plate 2, a plurality of ear portions 1 a and 2 a protrude in a direction perpendicular to the winding direction, and are arranged in a straight line for each of the positive electrode and the negative electrode at the end face of the wound electrode plate group 4. It is provided to do.

  Further, the roots of the respective ear portions 1a and 2a correspond to the curvatures of the respective electrode plates 1 and 2 and are formed into curved surfaces curved so that the winding center side is concave. Further, the tips of the ear portions 1a and 2a are formed on a curved surface that is smaller than the curvature of the curved surface or on a non-curved plane. Furthermore, the base width of each ear | edge part 1a, 2a is formed larger than the width | variety of a front-end | tip.

  In the electrode plate group 4 formed in this way, a positive electrode strap 5 and a negative electrode strap (not shown) are attached to the respective ends of each ear portion 1a of the positive electrode plate 1 and each ear portion 2a of the negative electrode plate 2 according to polarity. Is provided.

  As shown in FIG. 3, the positive strap 5 and the negative strap 6 are inserted into the mold grooves 8 and 9 of the mold 7 by inserting the tips of the positive and negative ears 1a and 2a by the COS (Cast on Strap) method. A molten lead alloy is cast into each of the mold grooves 8 and 9, and the tips of the ears 1a and 2a are connected to each other for each polarity.

  Although the positive electrode plate 1 and the negative electrode plate 2 have long strips, FIG. 4 schematically shows the longitudinal direction compressed. As shown in FIG. 4, the positive electrode plate 1 and the negative electrode plate 2 are obtained by applying an active material to the positive electrode grid-shaped current collector 10 and the negative electrode grid-shaped current collector 11 made of long lead or lead alloy, respectively, in a conventional manner. It is held. In these grid-like current collectors 10 and 11, grids 14 are formed by longitudinal bones 12 in the longitudinal direction and longitudinal bones 13 in the width direction. When wound, the lateral length L1 of the lattice 14 located on the inner peripheral side of the electrode plate group 4 is not more than the longitudinal length L2 (L1 ≦ L2), and the lateral length L1 of the lattice 14 is the electrode plate group 4 The width is equal to or less than the width W1 (L1 ≦ W1) of the ears 1a and 2a located on the inner peripheral side of the inner side. The width of the transverse bone 12 in the longitudinal direction is larger than the width of the longitudinal bone 13 in the width direction. Furthermore, the corner | angular part 15 which exists in four places of the outer peripheral side and inner peripheral side when the grid | lattice-like collectors 10 and 11 are wound is formed in the obtuse angle or the curve form.

  Each of the ear portions 1 a and 2 a is projected and projected in a direction perpendicular to the longitudinal direction of the positive electrode plate 1 and the negative electrode plate 2. When the positive electrode plate 1 and the negative electrode plate 2 are wound, the respective ear portions 1a and 2a are arranged so that the respective ear portions 1a and 2a are linearly arranged for each polarity on the end surface of the formed electrode plate group 4. The intervals D1, D2, D3, and D4 are set so as to be wider toward the outer peripheral side (D1 <D2 <D3 <D4).

  Further, the widths W1, W2, W3, W4, and W5 at the tips of the ear portions 1a and 2a are set to be wider toward the outer periphery side in the wound state (W1 <W2 <W3 <W4 <W5).

  100 electrode plates of the present example and the conventional example were each produced, and when the state of peeling / dropping of the active material from the grid current collector was confirmed on the inner peripheral side of the wound electrode plate group, The number of substances peeled and dropped was 27 in the conventional electrode plate group (defective rate 27%), and 0 in the electrode plate group of this example (defective rate 0%).

  In the said Example, although described about the case where the ear | edge parts 1a and 2a are protruded for every round of winding of the positive electrode plate 1 or the negative electrode plate 2, the ear | edge parts 1a and 2a can also be protruded for every several rounds. .

  Moreover, in the said Example, although described about the case where the ear | edge parts 1a and 2a of the positive electrode plate 1 and the negative electrode plate 2 were protruded from one end surface of the electrode group 4, the positive electrode plate 1 and the ear | edge parts 1a of the negative electrode plate 2 were described. 2a can be protruded from one end face and the other end face for each polarity.

  Moreover, in the said Example, although it described about the cylindrical electrode group 4 used for a cylindrical lead acid battery, if it is a lead acid battery using the winding-type electrode group 4, it is a long cylindrical shape, an ellipse shape, etc. It is also possible to implement with other shapes.

  That is, a positive electrode plate having a plurality of ears projecting and a wound electrode plate group in which a negative electrode plate is wound through a separator are provided, and a positive electrode strap and a negative electrode strap are provided at the tips of the respective ears for each polarity. The positive electrode plate and the negative electrode plate are obtained by holding an active material in a grid-shaped current collector made of long lead or lead alloy, and at least one of the electrode plates is a grid-shaped current collector. The grid is formed by the horizontal bone in the longitudinal direction of the electric body and the vertical bone in the width direction, and if the horizontal length of the grid located on the inner peripheral side of the electrode plate group in the wound state is set to the vertical length or less, The distance between the longitudinal bones is narrowed on the inner circumference side where the curvature of the electrode plate group is large, and the number of longitudinal bones for collecting current in the direction of the ear can be increased. Moreover, the current collecting effect can be prevented from being impaired. In addition, if the horizontal length of the lattice located on the inner peripheral side of the electrode plate group in the wound state is set to be equal to or smaller than the width of the ear portion positioned on the inner peripheral side, the vertical bone is formed on the inner peripheral side where the curvature of the electrode plate group is large. The interval is narrowed, and the number of vertical bones for collecting current in the direction of the ear can be increased, so that the active material is less likely to peel and drop off from the lattice, and the current collecting effect can be prevented from being impaired. . Further, if the width of the horizontal bone of the grid-shaped current collector is made larger than the width of the vertical bone, the tensile strength in the longitudinal direction of the grid-shaped current collector can be secured, and the grid-shaped current collector can be secured when the electrode plate group is wound. Strain deformation of the active material is suppressed, and the active material is less likely to peel and drop off from the lattice, so that current collection from the active material can be prevented from being disturbed. If at least the corners on the inner peripheral side are formed in an obtuse angle or a curved shape, the corners of the grid-shaped current collector will become the separator even if strain deformation occurs in the grid-shaped current collector during winding of the electrode plate group. This makes it difficult to bite in and prevents the occurrence of minute shorts between the electrode plates. In addition, in the wound state, a plurality of ears are protruded at wider intervals toward the outer periphery, and the width of the plurality of ears is increased to the outer periphery. If it is made larger, the electrical resistance per unit length is relatively uniform on the inner and outer circumferences. It can prevent the order from becoming uneven from the ear portion formed at widely spaced about the outer periphery side in the inner periphery the current flowing through the entire plate.

  If the curvature of the tip of the ear is smaller than the curvature of the root of the ear, when forming the strap at the tip of the ear, the molten lead alloy cast into the mold easily enters between the tips of the plurality of ears, In addition, the difference in speed entering both sides of each ear portion is reduced, so that the welding conditions of the lead alloy around the tip of the ear portion can be improved, so that poor welding between the tip of the ear portion and the strap can be reduced. . Further, if the curvature of the base of the ear is the curvature of each electrode plate in that portion, the curvature of the base of the ear can be easily defined simultaneously with the winding of the electrode plate group. Also, if the tips of the ears are not curved, the molten lead alloy cast into the mold is most easily inserted between the tips of the ears when forming the straps at the tips of the ears. As a result, the welding speed of the lead alloy around the tips of the ears can be made uniform, so that poor welding between the tips of the ears and the straps can be reduced. Furthermore, if the width of the ear root is made larger than the width of the tip of the ear, the twist and stress generated at the root of the ear when the curvature of the tip of the ear is made smaller than the curvature of the ear root. Absorbing at the wide base of the ear portion, the posture of the ear portion can be made uniform, so that poor welding between the tip of the ear portion and the strap can be reduced.

It is a perspective view which shows the electrode group of one Example of the cylindrical lead acid battery which concerns on this invention. It is a top view which shows the state of the several ear | edge part which protrudes in the end surface of the electrode group of this example. It is sectional drawing which shows the state which forms a strap by the COS system at the front-end | tip of the some ear | edge part which protrudes in the end surface of the electrode group of this example. It is a model expanded view of the electrode plate used for the electrode plate group of this example. It is a perspective view which shows the electrode group of the cylindrical lead acid battery of a prior art example. It is a top view which shows the state of the several ear | edge part which protrudes in the end surface of the electrode group of a prior art example. It is sectional drawing which shows the state which forms a strap by the COS system in the front-end | tip of the some ear | edge part which protrudes in the end surface of the electrode group of a prior art example. It is a model expanded view of the electrode plate used for the electrode plate group of a prior art example.

DESCRIPTION OF SYMBOLS 1 Positive electrode plate 1a Ear part 2 of positive electrode plate Negative electrode plate 2a Ear part 3 of negative electrode plate Separator 4 Electrode group 5 Positive electrode strap 6 Negative electrode strap 7 Mold 8, 9 Type groove | channel 10 Positive electrode grid-shaped collector 11 Negative electrode grid-shaped collector Electrical body 12 Horizontal bone 13 Vertical bone 14 Grid 15 Corner

Claims (3)

A positive electrode plate having a plurality of ears protruding from each other, and a negative electrode plate having a wound-type electrode plate group in which a negative electrode plate is wound through a separator, and a positive electrode having a polarity corresponding to the tip of each of the plurality of ears for each polarity A lead acid battery connected by a strap and a negative electrode strap,
The positive electrode plate and the negative electrode plate are obtained by holding an active material on a grid-shaped current collector made of a long strip of lead or lead alloy, and the grid-shaped current collector of at least one of the electrode plates has a longitudinal direction. Grids are formed by the horizontal bones and the vertical bones in the width direction, the horizontal length of the grids located on the inner peripheral side of the electrode plate group is less than the vertical length ,
The plurality of ears are projected at wider intervals toward the outer periphery of the wound, and the width of the plurality of ears is formed larger as the outer periphery of the wound,
The lead-acid battery according to claim 1, wherein a lateral length of the lattice located on the inner peripheral side of the wound-type electrode plate group is equal to or smaller than a width of the ear portion positioned on the inner peripheral side . The lead-acid battery according to claim 1 , wherein a width of the horizontal bone of the grid-shaped current collector is larger than a width of the vertical bone. The lead-acid battery according to claim 1 or 2 , wherein at least an inner peripheral corner portion of the wound-type grid-shaped current collector is formed in an obtuse angle or a curved shape.

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