JP6059997B2 - Lead acid battery - Google Patents

Description

  The present invention accommodates a group of electrode plates formed by alternately laminating positive and negative electrode plates through separators in a battery case, and each of a positive electrode strap that connects positive electrode plates and a negative electrode strap that connects negative electrode plates. The present invention relates to a lead-acid battery comprising a positive pole and a negative pole.

Conventionally, an electrode plate group formed by alternately laminating a plurality of positive electrode plates and a plurality of negative electrode plates via separators is accommodated in a battery case, and an ear group protruding from the electrode plate of the same polarity is provided by a strap portion. A lead storage battery is known that is connected and provided with a terminal pole column in a pole column seat portion that is continuous from the strap portion (see, for example, Patent Document 1).
These lead-acid batteries are attached to power supply facilities as an assembled battery system in which a plurality of lead-acid batteries are connected in series or in parallel, and are always float-charged to keep the battery fully charged and discharge the battery during a power failure. , May be used for emergency. Also, in recent years, such assembled battery systems are charged with cheap nighttime power and discharged when daytime power demand increases to be used for load leveling that equalizes the power load and for use with renewable energy. There is also.

JP 2003-197173 A

However, if the lead storage battery is charged and discharged frequently, the temperature of the terminal pole column and the electrode plate current collector (strap and pole column seats) rises due to Joule heat, which causes corrosion of the positive electrode grid and softening of the active material. There is a problem of promoting and shortening the battery life. In addition, in order to suppress the temperature rise of the terminal pole column and electrode plate current collector, it is necessary to keep the charge / discharge rate per rated discharge capacity low, and the number of batteries required for use as an assembled battery system increases. However, there is a problem of high cost.
An object of the present invention is to solve the problems of the conventional technology described above and to provide a lead storage battery having excellent thermal characteristics.

In order to achieve the above object, the present invention accommodates an electrode plate group formed by alternately laminating positive and negative electrode plates with separators in a battery case, and connects the ear groups of the same polarity electrode plates. In a lead storage battery in which a terminal pole column is connected to an electrode plate current collector portion comprising a strap portion and a pole column seat portion, a round (R) is attached to a continuous portion between the terminal pole column and the pole column seat portion . is, the thickness of the continuous portion is gradually thickened as it approaches the terminal electrode column, the radius of curvature of the rounded (R) (r) is 1 / 2t with respect to the strap portion of the thickness (t) It is characterized by being in the range of ≦ r ≦ 3 / 2t .

  According to the present invention, the electrode plate group in which the positive electrode plate and the negative electrode plate are alternately laminated via the separator is accommodated in the battery case, and the strap portion and the pole column seat for connecting the ear groups of the electrode plates of the same polarity are accommodated. In a lead-acid battery in which a terminal pole column is connected to a pole plate current collector consisting of a portion, the thickness of the continuous portion between the terminal pole column and the pole column seat portion is gradually increased as the terminal pole column is approached. Therefore, it is possible to reduce the current density of the continuous part between the terminal pole column and the pole column seat, and with a simple configuration, the temperature rise at the terminal pole column and electrode plate current collector is suppressed, and lead with excellent thermal characteristics Can provide storage battery

It is a figure which shows the lead acid battery which concerns on embodiment of this invention, (A) is a front view, (B) is a top view. It is a top view which shows the state before joining a lid | cover to a battery case. It is a figure which shows an electrode group, an electrode plate current collection part, and a terminal pole, (A) is a front view which shows the positive electrode side, (B) is a front view which shows the negative electrode side. It is a front view which shows a terminal pole column and an electrode plate current collection part.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing a lead storage battery 1 according to an embodiment to which the present invention is applied, and FIG. 2 is a plan view showing a state of the lead storage battery 1 before a lid 12 is joined to a battery case 11.
As shown in FIG. 1, the lead storage battery 1 includes a hollow rectangular parallelepiped battery case 11 having an open top surface and a lid 12 joined to the opening edge 11 </ b> A of the battery case 11 by heat welding or the like. The battery case 11 and the lid 12 are injection-molded using a synthetic resin material such as polypropylene or ABS resin, for example. A lead alloy bushing 16 is inserted into the lid 12 in the resin material of the lid 12 into the terminal 12 insertion hole through which the positive electrode / negative electrode terminal pole column 24 (consisting of the positive electrode column 24A and the negative electrode column 24B) is inserted. Are molded. Further, the positive pole 24A and the negative pole 24B are integrated with the bushing 16 by welding, and their tip portions protrude from the top of the lid 12 to be formed as a positive terminal and a negative terminal, respectively. Further, a positive electrode mark 14 and a negative electrode mark 15 indicating the polarity direction of the polar column are embossed on the upper surface of the lid 12.
An electrolytic solution made of dilute sulfuric acid having a predetermined concentration is injected into the battery case 11 from a liquid injection port provided on the upper surface of the lid 12, and the liquid injection port is sealed by a rubber valve (not shown) and an exhaust plug 13. The lead storage battery 1 is sealed

An electrode plate group 20 is accommodated in the battery case 11. As shown in FIGS. 2 and 3, the electrode plate group 20 includes ears 22 (positive electrode ears 22A and negative electrode ears 22B) extending from a plurality of electrode plates 21 (consisting of a positive electrode plate 21A and a negative electrode plate 21B) to the upper side of the battery. To the strap portion 29 of the electrode plate current collector 23 (consisting of a positive strap 23A and a negative strap 23B). More specifically, the electrode plate group 20 includes a plurality of positive electrode plates 21A and a plurality of negative electrode plates 21B, and is formed by alternately laminating these positive electrode plates 21A and negative electrode plates 21B via separators (not shown). . As shown in FIG. 3, the positive electrode plate 21 </ b> A includes positive electrode ears 22 </ b> A that protrude above the positive electrode plate 21 </ b> A, and these positive electrode ears 22 </ b> A are integrally formed by a positive electrode strap 23 </ b> A that extends in the stacking direction of the electrode plate group 20. It is connected. The negative electrode plate 21 </ b> B includes negative electrode ears 22 </ b> B that protrude above the negative electrode plate 21 </ b> B, and these negative electrode ears 22 </ b> B are integrally connected by a negative electrode strap 23 </ b> B extending in the stacking direction of the electrode plate group 20.
The positive electrode strap 23A and the negative electrode strap 23B are respectively provided with a positive electrode column 24A and a negative electrode column 24B which are led out from the lid 12 via the electrode plate seat portion 28 and serve as a positive electrode terminal and a negative electrode terminal, respectively. Yes.

  As shown in FIG. 2, the electrode plate current collector 23 includes a pole column seat portion 28 and a strap portion 29. The strap portion 29 is formed of lead or a lead alloy in a substantially rectangular shape in plan view extending in the stacking direction of the electrode plate group 20. The pole column seat portion 28 is formed in a substantially triangular shape in plan view with lead or a lead alloy. The pole pole seat 28 is formed integrally with the terminal pole pole 24 formed of lead or a lead alloy. The pole pole seat portion 28 and the terminal pole pole 24 may be configured to be integrally formed by casting, may be configured to be integrated by welding, or may be formed by cutting. The structure formed integrally may be sufficient. The electrode plate current collector 23 is formed by integrating a pole column seat portion 28 provided with a terminal pole column 24 integrally with a strap portion 29 by welding.

As shown in FIG. 4, the continuous portion 25 of the terminal pole column 24 and the pole column seat portion 28 of the electrode plate current collector 23 is formed so as to gradually increase in thickness as it approaches the terminal pole column 24. ing. For example, the continuous portion 25 may have a stepped shape or a sloped shape that gradually increases in thickness as it approaches the terminal pole 24.
In addition, it is preferable that the continuous part 25 is rounded (R), and is formed in a substantially concave arc shape in a longitudinal section as the thickness gradually increases as the terminal pole 24 is approached. In this way, since the rounded portion (R) is attached to the continuous portion 25 of the pole column seat portion 28 and the terminal pole column 24, even when the pole column seat portion 28 and the terminal pole column 24 are integrally formed by casting, The pole pole seat 28 and the terminal pole pole 24 formed from the mold can be easily and integrally extracted.
Further, the radius of curvature (r) of the round (R) attached to the continuous part 25 is 1/2 t ≦ r ≦ 3 / 2t with respect to the thickness (t) of the strap part 29 of the electrode plate current collector part 23. More preferably, it is set within the range shown.

  If the radius of curvature (r) of the round (R) attached to the continuous portion 25 is set in a range of 1/2 t ≦ r ≦ 3 / 2t with respect to the thickness (t) of the strap portion 23, It is not necessary to have the same dimension along the circumferential direction of the terminal pole 24. For example, in the lead storage battery 1 of the present embodiment, as shown in FIG. 2, the terminal pole column 24 is provided at a position shifted to one side or the other side from the center of the electrode plate current collector 23. As a result, the density of the current that flows to the terminal pole column 24 through the electrode plate current collector 23 from the direction in which a large number of electrode plates 21 are connected to the position where the terminal pole column 24 is provided is small. The density of the current flowing from the direction in which the plate 21 is provided through the electrode plate current collector 23 to the terminal pole column 24 becomes higher. Therefore, the radius of curvature (r) of the continuous portion from the terminal pole column 24 to the large area side 28A of the pole column seat portion 28 is increased, and from the terminal pole column 24 to the narrow area side 28B of the pole column seat portion 28. You may form the curvature radius (r) of a continuous part small.

  In this way, the continuous portion 25 of the pole column seat portion 28 and the terminal pole column 24 is gradually increased in thickness as it approaches the terminal pole column 24, thereby causing Joule heat of the electrode plate current collector 23 and the terminal pole column 24. An increase in temperature can be suppressed and the thermal characteristics of the lead storage battery 1 can be improved. This is because the current density of the continuous part 25 can be reduced by gradually increasing the thickness of the continuous part 25 as it approaches the terminal pole 24, and the temperature of the continuous part 25 rises due to Joule heat. It is because it can suppress. As described above, when the radius of curvature (r) of the continuous portion 25 is changed in the circumferential direction of the terminal pole column 24, the current density of each portion is appropriately reduced to increase the temperature of the continuous portion 25. Can be suppressed.

  In the verification experiment, the radius of curvature (r) of the round (R) attached to the continuous portion 25 is made smaller than 1/2 t with respect to the thickness (t) of the strap portion 29 of the electrode plate current collector portion 23. It was found that the effect of sufficiently suppressing the temperature rise of the electrode plate current collector 23 and the terminal electrode column 24 is small. Further, when the radius of curvature (r) of the round (R) attached to the continuous portion 25 is larger than 3 / 2t with respect to the thickness (t) of the strap portion 29 of the electrode plate current collector portion 23, the temperature rises. It has been found that the effect of suppressing the saturation is saturated and the amount of lead used for the continuous portion 25 increases, leading to an increase in the mass of the lead storage battery 1 and an increase in cost.

  As a result, the thickness of the continuous portion 25 between the strap portion 29 of the electrode plate current collector 23 and the terminal pole column 24 is gradually increased as it approaches the terminal pole column 24, and a round (R) is added to the continuous portion 25. By setting the radius of curvature (r) in the range of 1 / 2t ≦ r ≦ 3 / 2t, an effect of efficiently suppressing the temperature rise of the electrode plate current collector 23 and the terminal electrode column 24 can be obtained. Therefore, the lead battery 1 can be used for a lead storage battery system for power load leveling or renewable energy leveling, thereby maintaining a long-life and highly safe assembled battery system.

  Next, examples of the present invention will be described together with comparative examples.

<Example 1>
As shown in FIG. 4, the thickness (t) of the strap portion 29 is formed to 8 mm, the round portion (R) is attached to the continuous portion 25, and the radius of curvature (r) is formed to 2 mm. A square control valve type lead-acid battery 1 having a capacity of 1000 Ah was produced.

<Example 2>
Example 1 is the same as Example 1 except that the curvature radius (r) of the continuous part 25 is 4 mm.

<Example 3>
Example 1 is the same as Example 1 except that the curvature radius (r) of the continuous part 25 is 8 mm.

<Example 4>
The same as Example 1 except that the radius of curvature (r) of the continuous portion 25 is 12 mm.

<Example 5>
Example 2 is the same as Example 1 except that the curvature radius (r) of the continuous part 25 is 16 mm.

<Comparative Example 1>
Example 1 is the same as Example 1 except that the continuous part 25 is not rounded (R).

(test)
In order to measure the temperature rise due to charging / discharging of the lead storage battery 1, each of the lead storage batteries 1 of Examples 1 to 5 and Comparative Example 1 was fully charged at an ambient temperature of 25 ° C., and the negative electrode terminal 24B The temperature was measured. Next, after discharging at 0.3 CA (300 A) for 1 hour, the temperature of the negative electrode terminal 24B was measured, and the temperature change of the negative electrode terminal 24B before and after the discharge was measured.
Table 1 shows the temperature change of the negative electrode terminal 24B of the lead storage battery 1 before and after discharge obtained by this temperature measurement.
The temperature of the lead storage battery 1 was measured by attaching a thermocouple to the surface of the negative electrode terminal 24B of each lead storage battery 1, and the ambient temperature was 25 ° C.

  Examples 1-5 are the cases where R (R) is attached to the continuous portion 25 of the negative electrode column 24B and the pole column seat portion 28, and as shown in Table 1 above, the comparison without the R (R) is made. Compared with Example 1, the temperature change of the negative electrode terminal 24B was small, and it was confirmed that the temperature increase could be suppressed.

Next, in Examples 1 to 5 in which the curvature radius (r) is 2 mm to 16 mm in the lead storage battery 1 with the round (R) attached to the continuous portion 25, the curvature radius (r) is set to 4 mm or more. Thus (corresponding to Examples 2 to 5), compared with Comparative Example 1, the temperature change could be reduced from 0.8 ° C. (Example 1) to 3.4 ° C. (Example 5). Further, when the radius of curvature (r) is increased, when the radius of curvature (r) is changed from 2 mm to 4 mm, the temperature change is −1.4 ° C. (6.1 ° C.-7.5 ° C.). On the other hand, when it became large from 4 mm to 8 mm, 8 mm to 12 mm, and 12 mm to 16 mm, respectively, -0.7 degreeC (5.4 degreeC-6.1 degreeC) and -0.4 degreeC (5. 0 ° C.-5.4 ° C.), −0.1 ° C. (4.9 ° C.-5.0 ° C.), and it was confirmed that the temperature rise suppressing effect was saturated.
In particular, since the temperature rise suppressing effect in Example 5 is almost the same as that in Example 4, considering the increase in cost and mass due to the increase in the amount of lead, 1/2 t ≦ the thickness (t) of the strap part 29 It was confirmed that Examples 2 to 4 having a range of r ≦ 3 / 2t were particularly preferable.

  As described above, according to the embodiment to which the present invention is applied, the electrode plate group 20 formed by alternately stacking the positive electrode plates 21A and the negative electrode plates 21B through the separators is accommodated in the battery case 11, and the positive electrode plates are accommodated. The positive pole 24A and the negative pole 24B are connected to the positive pole strap 23A that connects the ear groups of 21A, the negative strap 23B that connects the ear groups of the negative electrode plate 21B, and the polar pole seats 28 that are continuous from the strap sections, respectively. In the lead storage battery 1, the thickness of the positive column 24A and the negative column 24B, the pole column seat portion 28 continuous with the positive strap 23A, and the thickness of the continuous portion 25 of the pole column seat portion 28 continuous with the negative strap 23B are changed to the positive column 24A. And it gradually thickened as it approached the negative pole 24B. As a result, a continuous portion 25 of the pole column portion 28 and the positive column 24A continuous with the positive electrode strap 23A connecting the positive electrode plate 21A, and a pole column seat portion 28 continuous with the negative electrode strap 23B connecting the negative electrode plate 21B and The current density in the continuous portion 25 with the negative electrode column 24B can be reduced. Therefore, it is possible to prevent the temperature of the continuous portion 25 between the terminal pole column 24 and the pole column seat portion 28 of the electrode plate current collector 23 from rising due to Joule heat. Therefore, the thermal characteristics of the lead storage battery 1 can be improved, and even when the lead storage battery 1 is frequently charged and discharged, the life of the lead storage battery 1 can be extended and the safety can be improved.

  In addition, according to the embodiment to which the present invention is applied, since the rounded portion (R) is attached to the continuous portion 25, the thickness of the continuous portion 25 is gradually increased as it approaches the positive electrode column 24A and the negative electrode column 24B with a simple configuration. The thickness can be increased, and the current density of the continuous portion 25 can be reduced. Therefore, it is possible to suppress the temperature of the continuous portion 25 from rising due to Joule heat, and even when the lead storage battery 1 is frequently charged and discharged, it is possible to extend the life of the lead storage battery 1 and improve safety. it can. Moreover, even when the pole column seat portion 28 and the terminal pole column 24 are integrally formed by casting by attaching a round (R) to the continuous portion 25, the pole column seat that is easily and integrally formed from the casting mold. The portion 28 and the terminal pole 24 can be easily removed.

  Further, according to the embodiment to which the present invention is applied, the radius of curvature (r) of the round (R) of the continuous portion 25 is 1/2 t ≦ r ≦ with respect to the thickness (t) of the positive strap 23A and the negative strap 23B. The range is 3 / 2t. Thereby, the radius of curvature (r) of the round (R) of the continuous portion 25 can be set within a range in which the thermal characteristics are excellent and the increase in cost and mass of the lead storage battery 1 can be minimized.

DESCRIPTION OF SYMBOLS 1 Lead acid battery 11 Battery case 20 Electrode board group 21A Positive electrode plate 21B Negative electrode plate 23 Electrode plate current collection part 23A Positive electrode strap 23B Negative electrode strap 24 Terminal electrode pole 24A Positive electrode pillar 24B Negative electrode pillar 25 Continuous part 28 Polar pole seat part 29 Strap part R Are r radius of curvature t thickness

Claims (1)

An electrode plate group comprising a positive electrode plate and a negative electrode plate alternately stacked via separators in a battery case, and comprising a strap portion and a pole column seat portion for connecting ear groups of the same polarity electrode plates. In lead-acid batteries that have terminal poles connected to electrical parts,
Wherein the terminal electrode post, and Earl (R) is subjected to continuous portion of the pole seat, the thickness of the continuous portion is gradually thickened as it approaches the terminal electrode post,
The radius of curvature (r) of the radius (R) is relative to the thickness (t) of the strap portion.
1 / 2t ≦ r ≦ 3 / 2t
Lead-acid battery characterized by being in the range .

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