JP2017212122A - Lead storage battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce heat radiation and suppress reduction in charge acceptability without reducing the external dimensions of an electrode plate group.SOLUTION: The lead storage battery includes: a battery case 4 that houses an electrode plate group 2; a lid 5 that closes an upper opening of the battery case 4 and has an uneven structure; and a heat insulating section 10 that is provided in a recess 5M of the lid 5.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a lead-acid battery.

  Lead storage batteries are known to have reduced charge acceptability in a low temperature environment, and in order to suppress this decrease in charge acceptability, it is considered to keep the inside of the battery at a high temperature using heat generated during charging. It has been.

  Specifically, as shown in Patent Document 1, in a lead-acid battery having a battery case that accommodates an electrode group and a lid that seals the opening of the battery case, a heat insulating part is provided on the side wall of the battery case. Some have reduced heat dissipation from the side walls. This heat insulation part is the structure which provided the heat insulation member in the sealed space formed in the side wall, or is the structure which decompressed the sealed space to the pressure lower than atmospheric pressure.

JP 2006-114315 A

  However, in a configuration in which a sealed space is provided on the side wall, it is necessary to increase the thickness of the side wall in order to ensure the mechanical strength while ensuring the heat insulating effect. The external dimensions of the battery case are determined by the standard, and in order to provide a lead-acid battery that meets this standard, the width or depth of the housing space that accommodates the electrode plate group is reduced by increasing the thickness of the side wall. End up. Then, it is necessary to reduce the width dimension or depth dimension of the electrode plate group by reducing the size of the electrode plate or decreasing the number of electrode plates, which may lead to a decrease in battery capacity.

  Accordingly, the present invention has been made to solve the above-described problems, and its main problem is to reduce heat dissipation without reducing the outer dimensions of the electrode plate group and to suppress a decrease in charge acceptance. To do.

  That is, a lead storage battery according to the present invention includes a battery case that accommodates an electrode plate group, a lid that closes an upper opening of the battery case, and has a concavo-convex structure, and a heat insulating portion that is provided in the recess of the lid. It is characterized by providing.

Here, the concave portion of the lid is formed in the resin portion on the upper surface or the lower surface of the lid, excluding the exhaust structure such as an exhaust valve, the liquid injection structure such as a liquid plug, and the terminal connected to the pole column. It is formed in the part. The concave portion forms a dead space that does not restrict at least the height dimension of the electrode plate group.
Further, when the lid has a double lid structure including an inner lid and an upper lid, the concave portion of the lid is the concave portion of the inner lid or the upper lid. As what has this double lid | cover structure, in the lead storage battery which has several cell chambers, what comprised the collective exhaust flow path which exhausts from each cell chamber collectively by an inner cover and an upper cover can be considered.

If it is this lead acid battery, since the heat insulation part is provided in the lid | cover, the heat radiation from a lid | cover can be reduced. Thereby, the inside of a battery can be kept at high temperature, and the fall of charge acceptance property can be suppressed.
Moreover, since the width dimension and the depth dimension of the accommodation space for accommodating the electrode plate group are not reduced by providing the heat insulating portion on the lid, it is not necessary to reduce the width dimension and the depth dimension of the electrode plate group. Furthermore, the inside of the concave portion of the lid is a dead space that does not restrict the height dimension of the electrode plate group, and it is not necessary to reduce the height dimension of the electrode plate group by providing a heat insulating part in the concave portion. Thereby, the heat dissipation from a lead acid battery can be reduced, maintaining battery capacity. In addition, since the heat insulating portion is provided in the concave portion of the lid, it is not necessary to increase the external dimension of the lead storage battery in the height direction.
In addition, as the height dimension of the battery case increases, it becomes difficult to manufacture (for example, injection molding) in the conventional configuration in which the sealed space is provided in the side wall. It can be manufactured without being affected by the height of the tank.

  Since the lid is provided with an exhaust structure, a liquid injection structure, a pole column, a terminal, and the like, the concave portion is partially formed on the upper surface and the lower surface of the lid. If it does so, a heat insulation part cannot be provided in the whole lid | cover, but the size of the heat insulation part in planar view becomes small. For this reason, if the said heat insulation part is a pressure reduction space at normal temperature, a pressure reduction space will become small and the deformation | transformation can be suppressed even if the formation wall which forms this pressure reduction space is resin.

As described above, heat dissipation from the inside of the battery can be suppressed by providing a heat insulating portion on the lid. As a result, the inside of the battery becomes high temperature, and it is assumed that water vapor generated by evaporation of the electrolyte increases. When the water vapor increases, the electrolyte solution decreases, which causes a problem that the battery deteriorates or the water needs to be replenished frequently.
In order to solve this problem suitably, it is desirable that the lid has a liquid return space connected to the internal space of the battery case on the heat insulating portion.
Since this liquid return space is located on the heat insulating portion, it is difficult to be warmed by the heat inside the battery case, and is easily cooled by the outside air. As a result, the water vapor can be easily condensed in the liquid return space, and returned to the battery case to suppress the decrease in the electrolyte.

In a low temperature environment, the charge acceptability of the lead storage battery is lowered, and therefore, the lead storage battery mounted on the idling stop vehicle tends to be insufficiently charged and has a short life. Further, there arises a problem that the SOC is lowered and the engine cannot be started.
Therefore, the effect of the present invention becomes more remarkable in the case of an idling stop vehicle.

Among lead-acid batteries for automobiles, liquid-type lead-acid batteries for four-wheel vehicles are placed in the engine room and used in a relatively warm environment even in cold winters. It is often placed in a cold environment.
Therefore, the effect of the present invention becomes more remarkable in the case of the control valve type. In particular, since the motorcycle is placed in the same environment as the outside air temperature and becomes the coldest environment, the effect of the present invention becomes more remarkable in the case of a motorcycle.

  According to the present invention configured as described above, since the heat insulating portion is provided in the concave portion of the lid, heat dissipation is reduced without reducing the outer dimension of the electrode plate group, and the decrease in charge acceptance is suppressed. Can do.

It is a front sectional view showing typically the composition of the lead acid battery of this embodiment. It is a schematic diagram which shows an example of the formation method of the decompression space of the embodiment. It is front sectional drawing which shows typically the structure of the lead storage battery of deformation | transformation embodiment. It is front sectional drawing which shows typically the structure of the lead storage battery of deformation | transformation embodiment.

  Hereinafter, an embodiment of a lead storage battery according to the present invention will be described with reference to the drawings.

  The lead storage battery 100 according to the present embodiment is of a control valve type, and accommodates the electrode plate group 2 having the positive electrode plate 21, the negative electrode plate 22, and the separator 3, and the electrode plate group 2, as shown in FIG. A rectangular parallelepiped box-shaped battery case 4 having a plurality of cell chambers and a lid 5 for closing the upper opening of the battery case 4 are provided. The lead storage battery 100 is mounted on, for example, an idling stop vehicle or a motorcycle.

  The electrode plate group 2 is formed by alternately laminating a plurality of positive electrode plates 21 and a plurality of negative electrode plates 22 through a separator 3 made of a porous material so as to have a rectangular parallelepiped shape. The positive electrode plate 21 is obtained by holding a positive electrode active material in a positive electrode grid made of, for example, a lead alloy. The negative electrode plate 22 is obtained by holding a negative electrode active material in a negative electrode lattice made of, for example, a lead alloy.

  The positive electrode strap 23 located on the upper part of the electrode plate group 2 collects current by integrating the ears of the plurality of positive electrode plates 21. A positive pole 24 is provided above the positive strap 23 provided in the outermost cell chamber among the positive straps 23 provided in each of the plurality of cell chambers. An inter-cell connection conductor (not shown) is provided on the other portion of the positive electrode strap 23. Moreover, the negative electrode strap 25 located on the upper part of the electrode plate group 2 collects current by integrating the ears of the plurality of negative electrode plates 22. A negative pole (not shown) is provided on the upper part of the negative strap 25 provided in the outermost other cell among the negative straps 25 provided in each of the plurality of cell chambers. An intercell connection conductor 26 is provided on the other portion of the negative electrode strap 25.

  The lid 5 is made of a resin such as polypropylene resin (PP), for example, and is provided with an exhaust structure such as an exhaust valve 6 and a liquid injection structure such as a liquid injection port 7. Note that an exhaust structure may be provided in the liquid injection port 7 so that the exhaust structure and the liquid injection structure are integrated. A positive electrode terminal 8 and a negative electrode terminal (not shown) are provided on the upper surface of the lid 5, and a positive electrode column 24 is connected to the positive electrode terminal 8 from the lower surface side of the lid 5.

  An uneven structure is formed on the upper and lower surfaces of the lid 5 by the parts 6 to 8 and the fixing structure 51 provided on the lid 5 for fixing them.

  And the heat insulation part 10 is provided in the recessed part 5M in this uneven structure. The heat insulation part 10 of this embodiment is the decompression space made into the pressure lower than atmospheric pressure in normal temperature (15-25 degreeC). The decompression space 10 is formed by a resin-made forming wall 11 that seals a part of the space of the recess 5M to form a sealed space, and is a space surrounded by the inner surface of the recess 5M and the inner surface of the forming wall 11. is there.

  The concave portion 5M in which the heat insulating portion 10 is provided forms a dead space that does not restrict at least the height dimension of the electrode plate group 2, and is located on the upper surface and the lower surface of the lid 5 at a position different from the above components 6-8. It is formed in the resin part. That is, the recess 5M in which the heat insulating portion 10 is provided is formed at a position that does not overlap with the components 6 to 8 in a plan view, and the heat insulating portion 10 does not overlap with the components 6 to 8 in a plan view. Is provided.

As a method for forming the decompression space 10, for example, the following can be considered.
First, the forming wall 11 is welded in the recess 5M to the lid 5 before being welded to the battery case 4. As a result, a sealed space is formed in the recess 5M. As shown in FIG. 2, a decompression generation unit 12 is provided on the formation wall 11. The decompression generation unit 12 includes a drawing portion 121 provided so as to be slidable in the penetration direction of the forming wall 11. The extraction portion 121 slides while being kept airtight by a sealing member such as an O-ring. In addition, the extraction part 121 is located inside the formation wall 11 in a state where the formation wall 11 is welded in the recess 5M (see [Before decompression] in FIG. 2).
And by pulling out this extraction part 121 toward the outer side of the formation wall 11, the volume of sealed space becomes large and the pressure becomes small. In addition, the extraction part 121 extracted outside is fixed so as not to move inward. Thereby, the decompression space 10 is formed (see [After decompression] in FIG. 2). Note that a plurality of extraction portions 121 may be provided on one forming wall 11.

  According to the lead storage battery 100 according to the present embodiment configured as described above, since the heat insulating portion 10 is provided on the lid 5, heat radiation from the lid 5 can be reduced. Thereby, the inside of a battery can be kept at high temperature, and the fall of charge acceptance property can be suppressed.

  Moreover, since the width dimension and the depth dimension of the accommodating space for accommodating the electrode plate group 2 are not reduced by providing the heat insulating portion 10 on the lid 5, it is not necessary to reduce the width dimension and the depth dimension of the electrode plate group 2. Furthermore, the inside of the concave portion 5M of the lid 5 is a dead space that does not restrict the height dimension of the electrode plate group 2, and it is necessary to reduce the height dimension of the electrode plate group 2 by providing the heat insulating portion 10 in the concave portion 5M. There is no. Thereby, the heat radiation from the lead storage battery 100 can be reduced while maintaining the battery capacity. Furthermore, since the heat insulating portion 10 is provided in the concave portion 5M of the lid 5, it is not necessary to increase the height dimension of the lead storage battery 100 in the height direction.

  Furthermore, as the height dimension of the battery case 4 increases, it becomes difficult to manufacture (for example, injection molding) in the configuration in which the sealed space is provided in the side wall as in the related art, but the configuration in which the heat insulating portion 10 is provided in the lid 5. Can be manufactured without being affected by the height dimension of the battery case 4.

  In addition, since the decompression space 10 is formed by effectively utilizing the concave portion 5M partially formed in the lid 5, the decompression space 10 is reduced, and the resin-made forming wall 11 forming the decompression space 10 is reduced. Deformation can be suppressed.

  The present invention is not limited to the above embodiment.

  For example, in addition to the configuration of the above embodiment, as shown in FIG. 3, the lid 5 may have a liquid return space 13 connected to the internal space of the battery case 4 on the heat insulating portion 10. The liquid return space 13 is formed so as to at least partially overlap the heat insulating portion 10 in plan view. That is, the heat insulating portion 10 is positioned between the internal space of the battery case 4 and the liquid return space 13. The liquid return space 13 is not easily warmed by the heat inside the battery case by the heat insulating portion 10, and is easily cooled by the outside air. As a result, water vapor can be easily condensed in the liquid return space 13 and returned to the battery case 4 to suppress a decrease in the electrolyte solution 3.

  Moreover, it is good also as a structure which provides a heat | fever reflective film in the decompression space 10 which is a heat insulation part. Thus, by providing a heat reflective film in the decompression space 10, the heat from the battery case side can be reflected by heat, and the release of heat can be further reduced. Moreover, a part of heat insulation effect by decompressing sealed space can also be supplemented with a heat insulation film. As a result, the degree of decompression of the sealed space can be reduced, and the required mechanical strength of the lid 5 can be easily secured by decompressing the sealed space.

As a method for forming the decompression space 10, the following may be considered in addition to the above embodiment.
For example, a decompressed space may be formed by enclosing a gas having a temperature higher than normal temperature in a space serving as a heat insulating portion, and then lowering the space to normal temperature.
Alternatively, a reduced pressure space may be formed by forming a space serving as a heat insulating part in a temperature environment higher than normal temperature and then lowering the space to normal temperature.
Furthermore, you may form a pressure reduction space by forming the space used as a heat insulation part in a pressure reduction environment.

  Furthermore, you may comprise the heat insulation part 10 provided in the recessed part 5M of the lid | cover 5 by arrange | positioning another member which has pressure reduction space in the recessed part 5M. Further, the heat insulating portion 10 may be configured by disposing a heat insulating material or a heat reflecting film having a thermal conductivity smaller than that of the material of the lid 5 (for example, polypropylene resin (PP)) in the recess. These structures only have to be prepared by attaching a ready-made one in the recess 5M, and the manufacture thereof is simple as compared with the case where the decompression space is formed.

  In addition, in the embodiment, the heat insulating portion 10 is provided in the concave portion 5M formed on the lower surface of the lid 5, but the heat insulating portion 1 is provided in the concave portion formed in the upper surface of the lid 5. , Heat dissipation from the lid 5 can be suppressed.

  In addition, for example, in the case of the lead storage battery 100 having a plurality of cell chambers, a collective exhaust flow path that collectively exhausts from each cell chamber may be provided inside the lid 5. This collective exhaust passage is formed by a double lid structure including an inner lid and an upper lid. In this case, you may provide the heat insulation part 10 in the recessed part formed in the inner cover or the upper cover.

  Moreover, although the liquid injection structure of the said embodiment was a liquid injection port, as shown in FIG. In FIG. 4, a structure having the control valve 6 in addition to the liquid spigot 14 is shown, but the control valve 6 may be omitted and another exhaust structure may be provided.

  In addition, it goes without saying that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 100 ... Lead storage battery 2 ... Electrode group 4 ... Battery case 5 ... Lid 5M ... Recess 10 ... Heat insulation part 13 ... Liquid return space

Claims (3)

A battery case for housing the electrode group;
A lid that closes the upper opening of the battery case and has a concavo-convex structure;
A lead storage battery comprising: a heat insulating portion provided in a concave portion of the lid.   The lead storage battery according to claim 1, wherein the heat insulating portion is a decompressed space at room temperature.   The lead storage battery according to claim 1, wherein the lid has a liquid return space connected to the internal space of the battery case on the heat insulating portion.