JPWO2013008383A1 - Lead acid battery - Google Patents

Abstract

The lead storage battery of the present invention includes a battery case partitioned by a partition plate into a plurality of cell chambers, and a plurality of positive plates and negative plates formed by filling a lead alloy lattice body with an active material paste via a separator. A plurality of electrode plate groups opposed to each other and a lid for sealing the opening of the battery case, and each cell chamber contains the electrode plate group and the electrolyte, and has the same polarity in the electrode plate group. The electrode plates are electrically connected by a connection member, the connection members of different polarities accommodated in adjacent cell chambers are connected by a through connection member, and the bottom of the battery case A shock-absorbing member that is entirely deformed following the expansion is disposed, and the shock-absorbing member supports the electrode plate group.

Description

  The present invention relates to a lead storage battery, and more particularly to a lead storage battery using an electrode plate made of an expanded lattice.

  Lead-acid batteries have a stable demand mainly for automobile applications, and recently, the demand for lead-acid batteries is increasing as an auxiliary machine for a hybrid electric vehicle (HEV).

  In general, a lead storage battery has a positive electrode plate and a negative electrode plate (hereinafter, collectively referred to as an electrode plate), which are formed by filling a lead alloy lattice body with an active material paste, facing each other via a separator. The electrode plate group is stored in each cell chamber of the battery case divided into a plurality of cell chambers by the partition plate, and the electrode plate groups are connected in series by the connecting member and the through-connecting member. Thereafter, the opening of the battery case is sealed with a lid, and after pouring electrolyte (diluted sulfuric acid) from a liquid port provided in the lid, the liquid port is closed with a liquid port stopper.

  It is known that when a lead storage battery is repeatedly charged and discharged, a positive electrode plate (mainly a lattice) expands. For example, even if measures were taken to include a positive electrode plate in a bag-like separator, if the expansion was severe, stress was concentrated at the bottom of the bag-like separator, a hole opened, dropped from the positive electrode plate, and leaked from this hole There was a problem that the active material short-circuited the positive electrode plate and the negative electrode plate.

  Therefore, as in Patent Document 1, by providing a kamaboko-shaped club (seat: a table on which things are placed) that can be bent at the bottom of the battery case, the separator is protected even if stress is concentrated on the lower part of the bag-shaped separator. It is known that the active material can be prevented from falling off.

JP 60-017853 A

  In recent years, when a lead-acid battery is repeatedly charged and discharged at a high temperature, a phenomenon (upper short) in which the grid of the positive electrode plate extends and short-circuits with the connection member on the negative electrode plate side has begun to be reported. Since Patent Document 1 shows a configuration that allows the elongation of the lattice body at the lower part of the battery case, it is considered effective as a means for suppressing the upper short circuit. However, even if the technique of Patent Document 1 is used, the upper short circuit is actually used. Could not be completely suppressed.

  This invention is made | formed about the said subject, suppresses the upper short circuit which becomes easy to generate | occur | produce by repeatedly charging / discharging a lead storage battery under high temperature, and provides a high quality lead storage battery with a long lifetime.

  In order to solve the above-mentioned problems, a lead storage battery according to the present invention includes a battery case partitioned into a plurality of cell chambers by an intermediate partition plate, and a plurality of positive electrode plates formed by filling a lead alloy lattice body with an active material paste. And a plurality of electrode plate groups in which the negative electrode plates are opposed to each other via a separator, and a lid for sealing the opening of the battery case, each of the cell chambers stores the electrode plate group and the electrolyte. The electrode plates of the same polarity in the electrode plate group are electrically connected by a connection member, and the connection members of different polarities accommodated in the adjacent cell chambers are connected by a through connection member. A buffer member that is deformed as a whole following the expansion of the electrode plate group is disposed at the bottom of the battery case, and the buffer member supports the electrode plate group. To do.

  Only a part of the lower side portion of the positive electrode plate and the negative electrode plate may be supported by the buffer member.

  It is good also as a structure which uses what is used for the said positive electrode plate among the said grid bodies by an expanded construction method.

  The buffer member may be a pair of plate-like objects extending obliquely upward from the bottom of the battery case, and the pair of plate-like objects may extend in different directions.

  It is good also as a structure by which the protrusion protruded from the bottom of the said battery case is arrange | positioned between the said plate-shaped object and the bottom of the said battery case.

  The buffer member may be a leaf spring that is convexly curved upward from the bottom of the battery case toward the center of the lower surface of the electrode plate group. A pair of protrusions protruding from the bottom of the battery case may be disposed between two sides where the leaf spring contacts the bottom of the battery case.

  The buffer member may be a spiral spring. It is good also as a structure by which the protrusion protruded from the bottom of the said battery case is arrange | positioned so that it may fit in the said helical spring.

  The buffer member may be a rectangular object made of a foam material.

  According to the present invention, the upper short circuit can be suppressed even when the lead storage battery is repeatedly charged and discharged at a high temperature, so that a high-quality lead storage battery with a long life can be provided.

It is a fragmentary perspective view which shows an example of a lead acid battery. (A) X-X 'sectional drawing in FIG. 1 of the initial state of the lead acid battery which concerns on 1st Embodiment, (b) It is sectional drawing of the state which repeated the charging / discharging cycle. (A) X-X 'sectional drawing in FIG. 1 of the initial state of the lead acid battery which concerns on a comparison form, (b) It is sectional drawing of the state which repeated the charging / discharging cycle. It is X-X 'sectional drawing in FIG. 1 of another lead acid battery which concerns on 1st Embodiment. It is X-X 'sectional drawing in FIG. 1 of the lead storage battery which concerns on 2nd Embodiment. It is X-X 'sectional drawing in FIG. 1 of another lead acid battery which concerns on 2nd Embodiment. It is X-X 'sectional drawing in FIG. 1 of the lead acid battery which concerns on 3rd Embodiment. It is X-X 'sectional drawing in FIG. 1 of the lead acid battery which concerns on 4th Embodiment. It is X-X 'sectional drawing in FIG. 1 of another lead acid battery which concerns on 4th Embodiment. It is X-X 'sectional drawing in FIG. 1 of the lead acid battery which concerns on 5th Embodiment. It is X-X 'sectional drawing in FIG. 1 of the lead acid battery which concerns on 6th Embodiment.

  The background to the present invention will be described first.

  The configuration of Patent Document 1 is a configuration in which only the upper portion of the structure is deformed, not the entire club provided at the bottom of the battery case. With this configuration, since the lower part of the club is kept in its original shape, even if a small amount of active material accumulates between the clans, no short circuit occurs, so if the main cause of the short circuit is the missing active material Convenient.

  However, when the main cause of the short circuit is the elongation of the grid itself and a short circuit occurs on the upper side of the electrode plate, the amount of elongation is significant. It has been found that it is impossible to prevent. This tendency, that is, the amount of elongation of the grid becomes remarkable, is different from the cast grid when using a grid made of an expanded construction method that does not have a frame on both sides, or when a lead storage battery is used at a high environmental temperature. The case was particularly noticeable.

  Therefore, the inventors of the present application arranged the buffer member on the bottom of the battery case and placed the electrode plate group thereon, the buffer member was not partially deformed as in Patent Document 1, but the entire A configuration that can be deformed is adopted. As a result, even if the lattice body extends significantly at the end of the charge / discharge cycle, the entire buffer member pressed against the lattice body can be deformed. Therefore, most of the space between the lower part of the electrode plate group and the bottom of the battery case is an effective space for escaping the extended lattice body. If it does so, it will become possible to avoid that the extended grid | lattice loses a refuge and contacts with the connection member by the side of a negative electrode plate, and raise | generates an upper short circuit. In addition, that the whole deform | transforms means k which deform | transforms especially in the up-down direction of a buffer member. If there is a portion that is not deformed in the up-down direction, the degree to which the extension is released downward is reduced by deforming the remarkable elongation of the lattice.

  Below, the form for implementing this invention is explained in full detail using a figure.

  FIG. 1 is a partial perspective view showing an example of a lead-acid battery. A positive electrode plate 1a and a negative electrode plate 1b formed by filling an active material paste into a lead alloy lattice body are opposed to each other through a separator 1c to produce an electrode plate group 1, and a plurality (mainly 6 The electrode plate group 1 is accommodated in each cell chamber 3 of the battery case 2 partitioned into two cell chambers 3. In the same cell chamber 3, the ears (tab portions) of the positive electrode plate 1 a are collectively connected to one connection member 4, and the ears of the negative electrode plate 1 b are collectively connected to the other connection member 4. Then, the positive polarity connecting member 4 accommodated in a certain cell chamber 3 and the negative polarity connecting member 4 accommodated in the adjacent cell chamber 3 are connected in series using the through-connecting member 5, and the other polarity connecting member Connection members 4 at both ends not connected to 4 are connected to the pole columns. Furthermore, the opening 6 of the battery case 2 is sealed with a lid 6 having a liquid port, and poles connected to the electrode plate group 1 at both ends are fitted into a bushing to be integrated into a terminal 7. Finally, after injecting an electrolytic solution (dilute sulfuric acid, not shown) from the liquid port, the liquid port is closed by the liquid port plug 6a, thereby forming a lead storage battery.

  The lead storage battery of the embodiment is characterized in that a shock-absorbing member that can be deformed as a whole is disposed at the bottom of the battery case 2 and the electrode plate group 1 is placed on the shock-absorbing member.

(First embodiment)
2 is a cross-sectional view of the lead storage battery according to the first embodiment, taken along line XX ′ in FIG. 1. FIG. 2A shows an initial state, and FIG. 2B shows a state in which the grid is extended by repeating the charge / discharge cycle. . In the first embodiment, a pair of plate-like objects 8 projecting obliquely upward from the bottom of the battery case 2 is used as a buffer member.

  On the other hand, FIG. 3 is a cross-sectional view taken along the line XX ′ in FIG. 1 in the first embodiment of the lead-acid battery of the comparative form, where (a) shows the initial state and (b) shows the state where the charge / discharge cycle is repeated. . Here, instead of the buffer member, a club 10 whose lower part is not deformed is used.

  In the case of the comparative form shown in FIG. 3, since the lower part of the club 10 keeps its original shape, even if a small amount of active material is deposited between the clubs 10, no short circuit occurs. It is convenient when it is a substance. However, when the main cause of the short circuit is a significant elongation of the lattice of the positive electrode plate 1a, the short circuit cannot be prevented in a long charge / discharge cycle unless the lower portion of the club 10 can be deformed. Specifically, as shown in FIG. 3 (b), the positive electrode plate 1a (specifically, its lattice body) is extended except for the places where the dimensions are regulated by the positive electrode connection member 4a, and the negative electrode connection member is the first. Contact with 4b (A in the figure) causes an upper short, and the lead-acid battery suddenly dies.

  Therefore, in the first embodiment, a pair of plate-like objects 8 projecting obliquely upward toward the center of the lower surface of the electrode plate group 1 are arranged at the bottom of the battery case 2 as buffer members, and the electrode plate group is mounted thereon. I tried to put it. This plate-like object 8 is formed integrally with the battery case 2. When the plate-like object 8 is pressed when the grid body of the positive electrode plate 1a is extended, the whole plate 8 is elastically deformed to secure a space for releasing the extension of the grid body. That is, when pressed by the electrode plate group 1, the entire pair of plate-like objects 8 is deformed so as to approach the bottom of the cell chamber 3, and finally the entire lower surface of the plate-like portion 8 is formed. It will stick to the bottom of the cell chamber 3. This action makes it possible to prevent the elongated lattice body from losing its escape and causing an upper short. Although there is a distance between the electrode plate group 1 and the bottom of the battery case 2, since the plate-like object 8 supports the bottom of the electrode plate group 1, excessive stress is applied to the connecting member 4 and the through-connecting member 5. Will not take.

  When the lead-acid battery shown in the first embodiment is mounted on the vehicle, the plate-like object 8 on which the electrode plate group 1 is placed is repeatedly deformed in the bottom direction of the battery case 2 due to vibration accompanying vibration of the vehicle. . When the degree of vibration is large or the frequency of vibration is large, the plate-like object 8 may be plastically deformed (or damaged) toward the bottom of the battery case 2. In order for the plate-like object 8 to exhibit the above-described upper short-circuit preventing function at the end of its life, it is necessary to prevent the plate-like object 8 from being plastically deformed (or broken) by such vibration.

  Therefore, as shown in FIG. 2, it is preferable that a pair of protrusions 9 protrude from the bottom of the battery case 2 to be brought into contact with the plate-like object 8 almost directly below the plate-like object 8. As a result, the plate-like object 8 is not deformed beyond the distance between the upper surface of the protrusion 9 and the upper end lower surface of the plate-like object 8, so that the plate-like object 8 is deformed even if the lead storage battery is subjected to repeated vibrations when mounted on the vehicle ( In addition, when the lattice of the positive electrode plate 1a extends at the end of the life, the protrusion 9 also tilts following the deformation of the plate 8 so that the above-described upper short prevention function can be exhibited. Become. The protrusion 9 may be omitted as long as it is a lead storage battery that does not cause severe vibration as a use environment.

  In addition, as another aspect of this embodiment, the aspect which arrange | positions the molding 11 which integrally has the plate-shaped object 8 '(and protrusion 9') to the bottom of the battery case 2 like FIG.

  In this embodiment, an effect becomes remarkable when what is used for at least the positive electrode plate 1a among the lattice bodies is an expanded method. The reason for this is that, unlike a cast grid, a lattice body made of an expanding method does not have frame frames on both sides, and thus is easily stretched during a charge / discharge cycle. The same applies to the second to sixth embodiments.

  In addition, this embodiment has a remarkable effect when the grid is easily stretched for use under a high environmental temperature (when used in a tropical climate region or when mounted in a vehicle with poor ventilation). . The same applies to the second to sixth embodiments.

  Here, as the positive electrode plate 1a, an active material paste containing lead and lead oxide can be used. The negative electrode plate 1b can be made of an active material paste containing lead and lead oxide, and further containing barium sulfate, carbon black, and a lignin compound. Polyethylene or the like can be used for the separator 1c, and polypropylene (PP) or acrylonitrile-butadiene-styrene copolymer resin (ABS) can be used for the battery case 2 and the lid 6. Similarly, the plate-like product 8 and the molded product 11 can be made of acid-resistant polypropylene (PP) or acrylonitrile-butadiene-styrene copolymer resin (ABS). Further, lead or various lead alloys can be used for the connecting member 4, the through connecting member 5, and the terminal 7. Furthermore, what has functions, such as explosion-proof, can be used for the liquid stopper 6a. In addition, it is preferable that the specific gravity of the dilute sulfuric acid used as electrolyte solution is 1.2-1.4 g / ml.

(Second Embodiment)
FIG. 5 is a cross-sectional view of the lead storage battery of the second embodiment taken along the line XX ′ in FIG. It replaces with the plate-shaped object 8 in 1st Embodiment, and arrange | positions the leaf | plate spring 12 curved convexly from the bottom of the battery case 2 to the bottom of the battery case 2 as a buffer member, 1st Embodiment. The same effect can be obtained. The leaf spring 12 can be made of acid-resistant polypropylene (PP) or acrylonitrile-butadiene-styrene copolymer resin (ABS).

  Although this form has the advantage that it is hard to damage a buffer member (plate spring 12) at the time of vehicle installation compared with a 1st embodiment, it should arrange plate spring 12 stably in the predetermined position of the bottom of battery case 2. Is slightly difficult. Therefore, it is preferable to project the pair of protrusions 9 from the bottom of the battery case 2 inside the two sides where the leaf spring 12 is in contact with the bottom of the battery case 2. Accordingly, the leaf spring 12 can be stably disposed at a predetermined position on the bottom of the battery case 2.

  If the large side spring 12 is used and the two sides of the leaf spring 12 in contact with the bottom of the battery case 2 are corners inside the battery case 2 as shown in FIG. In order to achieve both the buffering action of the spring 12 and the storage volume efficiency of the electrode plate group 1 (the efficiency decreases when the amount of bending of the plate spring 12 is large), it is necessary to pay attention to the material and thickness of the plate spring 12.

(Third embodiment)
FIG. 7 is a cross-sectional view of the lead storage battery of the third embodiment taken along the line XX ′ in FIG. By replacing the plate-like object 8 in the first embodiment with the helical spring 13 as a buffer member at the bottom of the battery case 2, the same effect as in the first embodiment can be obtained. For the spiral spring 13, acid-resistant polypropylene (PP) or acrylonitrile-butadiene-styrene copolymer resin (ABS) can be used.

  Although this form has the advantage that a buffer member (spiral spring 13) is hard to break at the time of vehicle installation compared with a 1st embodiment, helical spring 13 is stably arranged in the predetermined position of the bottom of battery case 2 It is a little difficult to do. Therefore, it is preferable to project the protrusion 9 from the bottom of the battery case 2 so as to fit into the spiral spring 13. As a result, the spiral spring 13 can be stably arranged at a predetermined position on the bottom of the battery case 2.

  When only one spiral spring 13 is used, it is difficult to obtain the effect of the present invention if the spiral spring 13 is small. If the spiral spring 13 is large, the storage volume efficiency of the electrode plate group 1 is lowered. Therefore, as shown in FIG. 7, it can be said that a mode in which at least a pair of small spiral springs 13 are arranged is more preferable.

(Fourth embodiment)
FIG. 8 is a cross-sectional view of the lead storage battery according to the fourth embodiment taken along the line XX ′ in FIG. Instead of the plate-like object 8 in the first embodiment, a rectangular object 14 made of foamed resin is disposed as a buffer member on the bottom of the battery case 2 (substantially the entire bottom of the cell chamber), so that the first embodiment and Similar effects can be obtained. As the electrode plate group 1 expands, it bites into the rectangular object 14. However, it is necessary to pay attention to the material and shape of the rectangular object 14 in order to selectively deform the lower part of the portion where the upper short-circuit is likely to occur as shown in FIG. The rectangular object 14 may be made of acid-resistant polypropylene (PP) or acrylonitrile-butadiene-styrene copolymer resin (ABS).

  FIG. 9 shows another aspect of this embodiment. The cushioning member shown in FIG. 9 is a rectangular object 15 made of foamed resin, but there are two rectangular objects 15 having a width of about ¼ compared to FIG. Both ends are supported. That is, the rectangular object 15 is longer than the rectangular object 14 in FIG. The central part of the lower side of the electrode plate group 1 is in an unsupported state. Compared to the embodiment of FIG. 8, the embodiment of FIG. 9 secures more space for escaping the elongation of the grids constituting the electrode plate, and the upper short circuit is less likely to occur.

(Fifth embodiment)
FIG. 10 is a cross-sectional view of the lead storage battery of the fifth embodiment taken along the line XX ′ in FIG. Instead of the plate-like object 8 in the first embodiment, two cushion members 16 each having a buffer plate portion 16a extending obliquely upward from two opposing sides of the bottom plate portion 16b are arranged at the bottom of the cell chamber. Yes. The buffer plate portion 16a is a buffer member. The two buffer plate portions 16a extend obliquely upward from the bottom plate portion 16b so as to approach each other. The electrode plate group 1 is supported by the upper end portion of the buffer plate portion 16a. The cushion member 16 may be made of acid-resistant polypropylene (PP) or acrylonitrile-butadiene-styrene copolymer resin (ABS). This embodiment can obtain the same effects as those of the first embodiment.

(Sixth embodiment)
FIG. 11 is a cross-sectional view of the lead storage battery of the sixth embodiment taken along the line XX ′ in FIG. Instead of the plate-like object 8 in the first embodiment, two rectangular rubber members 17 are used as cushioning members. The shape and arrangement of the rectangular rubber member 17 are the same as those of the rectangular object 15 in FIG. It is preferable to use a resin having acid resistance for the rubber member 17. This embodiment can obtain the same effects as those of the first embodiment.

(Example 1)
A reciprocating system that unfolds in a direction perpendicular to the longitudinal direction of the sheet while forming a plurality of staggered cuts parallel to the longitudinal direction of the strip-like sheet made of a lead-calcium alloy. A continuum of a strip-shaped expanded lattice composed of a part was prepared. It was produced by adding sulfuric acid and purified water to the raw material lead powder mainly composed of mixed powder of lead and lead oxide (Pb, PbO, Pb ₃ O ₄ ) for the part of the continuum excluding the plain part. After filling with the active material paste, drying, and cutting to a predetermined size, a positive electrode plate 1a having a lattice body having no frame bone on both side surfaces was produced. This positive electrode plate 1a and the negative electrode plate 1b by a conventional method were opposed to each other through a separator 1c, so that an electrode plate group 1 was produced.

  The electrode plate group 1 was housed in each cell chamber 3 of a PP battery case 2 partitioned into six cell chambers 3 by an intermediate partition plate 2a. Here, as shown in FIG. 2, a pair of plate-like objects 8 (width is the electrode plate group) projecting obliquely upward toward the center of the lower surface of the electrode plate group 1 at the bottom of each cell chamber 3 of the battery case 2. 1 is approximately the same as the thickness of 1 and 10 mm in height). In Example 1, the pair of protrusions 9 shown in FIG. 2 is omitted.

  Further, in the same cell chamber 3, the ears of the positive electrode plate 1 a are collectively connected to one connecting member 4, and the ears of the negative electrode plate 1 b are collectively connected to the other connecting member 4, and then connected to the positive polarity. The member 4 and the negative connection member 4 accommodated in the cell chamber 3 adjacent thereto are connected in series using the through connection member 5, and the connection members 4 at both ends not connected to the other polarity connection member 4 are pole columns. And connected. Further, the opening portion of the battery case 2 was sealed with a PP lid 6 having a liquid port, and poles connected to the electrode plate group 1 at both ends were fitted into a bushing to be integrated into a terminal 7. Finally, diluted sulfuric acid having a specific gravity of 1.28 g / ml was injected from the liquid port as an electrolytic solution, and then the liquid port was closed with the liquid port plug 6a, thereby producing a lead storage battery (55D23) for automobiles.

(Example 2)
Compared to the first embodiment, as shown in FIG. 4, a molded product 11 made of PP (a flat plate) integrally having a plate-like member 8 having the same dimensions as the first embodiment at the bottom of each cell chamber 3 of the battery case 2 A lead-acid battery was produced in the same manner as in Example 1 except that the thickness of the part was 1 mm). In Example 2, the pair of protrusions 9 shown in FIG. 4 is omitted.

Example 3
In contrast to Example 1, as shown in FIG. 5, the PP curved at the bottom of each cell chamber 3 of the battery case 2 in a convex shape from the bottom of the battery case 2 toward the center of the lower surface of the electrode plate group 1. A plate spring 12 made of metal (the bending height is 10 mm, the length in the bending state is 2/3 of the width of the electrode plate group 1), and further, from the two sides where the plate spring 12 is in contact with the bottom of the battery case 2 In addition, a lead-acid battery was produced in the same manner as in Example 1 except that a pair of protrusions 9 (having a height of 3 mm) were disposed from the bottom of the battery case 2 by integral molding.

Example 4
Compared to Example 1, as shown in FIG. 6, a leaf spring 12 made of PP (curved height) curved upwardly from the bottom of the battery case 2 at the bottom of each cell chamber 3 of the battery case 2. Is 10 mm, and the length in the curved state is substantially the same as the width of the cell chamber 3, that is, the two sides in contact with the bottom of the battery case 2 become corners inside the battery case 2). A lead storage battery was prepared in the same manner as described above.

(Example 5)
In contrast to the first embodiment, as shown in FIG. 7, a pair of protrusions 9 (having a height of 3 mm) are arranged on the bottom of each cell chamber 3 of the battery case 2 by integral molding. A lead-acid battery was produced in the same manner as in Example 1 except that a helical spring 13 made of polycarbonate (PC) (with a height of 10 mm when the electrode plate group 1 was placed) was fitted.

(Example 6)
In contrast to Example 1, as shown in FIG. 8, lead is formed in the same manner as in Example 1 except that a rectangular object 14 made of a PP foam member is disposed at the bottom of each cell chamber 3 of the battery case 2. A storage battery was produced.

(Example 7)
Compared to Example 1, as shown in FIG. 9, except that two rectangular objects 15 made of PP foam members are arranged at the bottom of each cell chamber 3 of the battery case 2, Example 1 and Similarly, a lead storage battery was produced.

(Example 8)
In contrast to the first embodiment, as shown in FIG. 10, a PP cushion member 16 (the height of the buffer plate portion 16 a is 10 mm and the width of the bottom plate portion 16 b is extremely large) at the bottom of each cell chamber 3 of the battery case 2. A lead-acid battery was produced in the same manner as in Example 1 except that two １ ／ of the width of the plate group 1 were disposed.

Example 9
In contrast to Example 1, as shown in FIG. 11, except that two rubber members 17 made of rubber made of ethylene-propylene-diene rubber (EPDM) are arranged at the bottom of each cell chamber 3 of the battery case 2. Produced a lead-acid battery in the same manner as in Example 1.

(Comparative example)
In contrast to the first embodiment, as shown in FIG. 3, the embodiment is the same as the first embodiment except that the bottom 10 of each cell chamber 3 of the battery case 2 is not integrally deformed with a club 10 (height is 10 mm). A lead storage battery was prepared in the same manner as in Example 1.

  The batteries of each of the examples and comparative examples were charged and discharged in a 75 ° C environment (14.8 V constant voltage charging for 10 minutes) and discharged (2 minutes at 25A) for 8000 times, and then 8000 times. After the cycle, the same charge / discharge cycle was repeated 25 times, once (after discharge), and discharged at 200 A for 2 seconds. In this discharge, when the ultimate voltage was less than 7.2 V, it was determined that the life was reached, and the charge / discharge cycle test was terminated. Table 1 shows the number of charge / discharge cycles reached in each example from the 8000th cycle.

  As apparent from (Table 1), in the comparative example in which the club 10 in which the lower part is not deformed is arranged at the bottom of the battery case 2, the life was reached with a relatively small number of cycles. When the comparative example 1 after the end of the life was disassembled and examined, it was found that the elongated lattice of the positive electrode plate 1a was in contact with the negative electrode connecting member 4b and caused an upper short.

  On the other hand, it turns out that the lead acid battery of each Example of this invention has a long life compared with the lead acid battery of a comparative example. Each example after the end of its life was disassembled and examined, and it was found that no upper short-circuit occurred as in the comparative example. Among them, Examples 1 to 3 and 5 to 8 made of materials and shapes in which the electrode plate group 1 is easily deformed to the lower part have good life characteristics even when compared with other Examples.

  In this embodiment, the pair of protrusions 9 are omitted in Examples 1 and 2 because the test is performed in a situation that does not involve intense vibration. However, when the use environment is accompanied by intense vibration, it is better to adopt the pair of protrusions 9. Needless to say, reliability is increased.

(Other embodiments)
The above-described embodiment is an exemplification of the present invention, and the present invention is not limited to these examples, and these examples may be combined or partially replaced with known techniques, common techniques, and known techniques. Also, modified inventions easily conceived by those skilled in the art are included in the present invention.

  The number of buffer members grounded to one cell chamber in each embodiment is not particularly limited, but it is preferable that a plurality of buffer members are present, and the buffer members in one cell chamber are preferably separated from each other.

  The lead storage battery of the present invention can suppress sudden death due to an upper short at a high temperature. Therefore, it is suitable for use in high-temperature areas and as a HEV auxiliary machine that easily accumulates heat, and not only has high applicability, but also has an extremely high industrial contribution.

DESCRIPTION OF SYMBOLS 1 Electrode plate group 1a Positive electrode plate 1b Negative electrode plate 1c Separator 2 Battery case 2a Middle partition plate 2b Outer wall 3 Cell chamber 4 Connection member 4a Positive electrode connection member 4b Negative electrode connection member 5 Through connection member 6 Lid 6a Liquid port plug 7 Terminal 8 Plate shape Object 8 'Plate-like object 9 Protrusion 9' Protrusion 10 Kura 11 Molded object 12 Leaf spring 13 Spiral spring 14 Rectangular object 15 Rectangular object 16 Cushion member 16a Buffer plate part 17 Rubber member

Claims (10)

A battery case partitioned into a plurality of cell chambers by an intermediate partition;
A plurality of positive electrode plates and negative electrode plates formed by filling a lead alloy grid with an active material paste, with a separator interposed therebetween,
A lid for sealing the opening of the battery case;
In each of the cell chambers, the electrode plate group and the electrolyte solution are stored,
The plates of the same polarity in the plate group are electrically connected by a connecting member,
The connecting members of different polarities accommodated in the adjacent cell chambers are connected by a through connecting member,
At the bottom of the battery case, a buffer member that is deformed as a whole following the expansion of the electrode plate group is disposed,
The said buffer member is a lead acid battery which is supporting the said electrode group.   The lead acid battery according to claim 1, wherein only a part of a lower side portion of the positive electrode plate and the negative electrode plate is supported by the buffer member.   The lead acid battery according to claim 1, wherein at least one of the lattice bodies used for the positive electrode plate is an expanded method. The buffer member is a pair of plate-like objects extending obliquely upward from the bottom of the battery case,
The lead-acid battery according to claim 1 or 2, wherein the pair of plate-like objects extend in different directions.   The lead acid battery according to claim 4, wherein a protrusion protruding from the bottom of the battery case is disposed between the plate-like object and the bottom of the battery case.   3. The lead acid battery according to claim 1, wherein the buffer member is a leaf spring that is convexly curved upward from the bottom of the battery case toward the center of the lower surface of the electrode plate group.   The lead acid battery according to claim 6, wherein a pair of protrusions protruding from the bottom of the battery case are disposed between two sides where the leaf spring is in contact with the bottom of the battery case.   The lead storage battery according to claim 1, wherein the buffer member is a spiral spring.   The lead acid battery according to claim 8, wherein a protrusion protruding from the bottom of the battery case is disposed so as to fit into the spiral spring.   The lead acid battery according to claim 1, wherein the buffer member is a rectangular object made of a foam material.

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