JP2010123365A - Control valve type lead-acid storage battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that when a control valve type lead-acid storage battery, in which a cell chamber with a cell housed and a cell chamber with a dummy cell housed are adjacent, is left for a long period of time, a pressure difference between the cell chambers is generated, stress is applied on a barrier rib between the cells, and the barrier rib is fractured resulting in leakage from a battery, oxidation of a negative electrode plate due to degradation of air-tightness of the cell chamber, leading to reduction of capacity. <P>SOLUTION: The control valve type lead-acid storage battery has a structure in which the cell is housed in the cell chamber adjacent to the cell chamber with no cell housed, and includes a beam-like spacer arranged in a cell array direction on an upper part of the cell. Thereby, even when the pressure difference is generated between the cell chambers, significant effect such as prevention of fracture of the barrier rib and prevention of capacity degradation of the battery can be achieved. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a valve-regulated lead-acid battery.

  Generally, a lead storage battery comprises a cell by laminating a plurality of positive electrode plates and negative electrode plates via a separator and connecting electrode plate ears of the same polarity with straps. These cells are disposed in a battery case made of a synthetic resin such as PP resin, ABS resin, or m-PPE resin (modified polyphenylene ether resin). Thereafter, the battery case is closed with a lid, and generally, the battery terminal formed on the lid is electrically connected to the cell accommodated in the battery case. A dilute sulfuric acid electrolyte is injected into the battery case and charged to complete the lead-acid battery.

  Among lead-acid batteries, there is a cell called so-called open type (vent type) or liquid type that has a configuration in which the inside and outside of the battery are always in communication and hydrogen gas and oxygen gas generated from the cell are discharged to the outside of the battery. A lead-acid battery with a configuration immersed in an electrolyte and a control valve type lead, which is called a control valve type, has a configuration in which the cell can be impregnated and retained, or at least a part of the cell is exposed from the electrolyte As is well known, it is roughly divided into storage batteries.

Among them, in a control valve type lead-acid battery, oxygen gas generated from the positive electrode during charging reacts with the negative electrode active material (Pb) to produce lead oxide (PbO) (Formula 1), and this lead oxide is electrolyzed. Since it reacts with sulfuric acid in the liquid to produce lead sulfate (PbSO ₄ ) similar to the discharge product of the negative electrode (Formula 2), the generation of hydrogen gas from the negative electrode is suppressed.

2Pb + O ₂ → 2PbO (Formula 1)
PbO + H ₂ SO ₄ → PbSO ₄ + H ₂ O (Formula 2)
In the control valve type lead-acid battery, oxygen gas staying inside the battery immediately after the end of charging is absorbed by the negative electrode as described above, so that the pressure inside the battery is in a reduced pressure state lower than atmospheric pressure.

  On the other hand, the nominal voltage of the control valve type lead-acid battery is 2V per cell. Except for some large-capacity industrial stationary lead-acid batteries, a plurality of cells are housed inside the battery, and the cells are connected in series. Thus, a desired battery voltage is obtained. FIG. 1 is a diagram showing an example in which six cells are arranged in a row in a battery case 2 in a control valve type lead storage battery (hereinafter referred to as battery 1) having a nominal voltage of 12V.

  In the battery 1 shown in FIG. 1, the inside of the battery case 2 is divided into six cell chambers 5 by the partition walls 4, and the cells C <b> 1 to C <b> 6 are accommodated in the respective cell chambers 5. A lead storage battery having a nominal voltage of 12 V is configured by connecting the connection bodies 3 in series. In FIG. 1, the cells C1 to C6 are simply represented by rectangles, but each of the cells C1 to C6 has a positive electrode plate (not shown) and a negative electrode plate (not shown) as a separator (not shown). ), And the ears of the positive electrode plate are gathered and welded by the positive electrode strap 6 and the ears of the negative electrode plate by the negative electrode strap 6 ', respectively.

  Thus, the number of cell chambers 5 formed inside the battery case 2 may be changed according to the desired battery voltage, and the volume of the cell chamber 5 may be set according to the desired battery capacity. It is clear.

  However, producing and possessing a dedicated battery case for each voltage and capacity and a dedicated mold for molding this battery case requires extremely expensive production costs, storage and maintenance man-hours. Moreover, it is uneconomical from the viewpoint of man-hours for switching the molding die for each battery type. For example, the battery case 2 for the 12V battery described above is used, and a cell (for example, cell C2) is provided in one of the six cell chambers 5. If a battery that does not store is produced, a 10V battery can be produced using a 12V battery case.

  Similarly, batteries of 12V, 10V, 8V, 6V, 4V and 2V can be created with a 12V battery case by adjusting the number of cells stored. As a result, the battery case and the battery case mold can be shared between the batteries of these respective voltages, so that it is possible to reduce the mold cost and the mold switching man-hours.

From this point of view, in the example of Patent Document 1, cells are stored in cell chambers at both ends of a battery case that can store three cells, and spacers are stored in intermediate cell chambers instead of cells. It is shown that a sealed lead-acid battery of 4V is obtained with a 6V battery case by connecting the cells at both ends with connecting lines.
Japanese Utility Model Publication No. 61-101964

  FIG. 2 shows an example in which the configuration shown in Patent Document 1 described above is applied to the battery 1 shown in FIG. 1 to form a 6V control valve type lead storage battery (hereinafter referred to as battery 1 ′).

  The battery 1 ′ shown in FIG. 2 is replaced with the cell C2, the cell C3, and the cell C4 used in the battery 1, and the first spacer 7 is housed in the cell chamber 5 corresponding to these to form a dummy cell. Between C1 and the cell C5, the connection body 3 and the connection bar 8 are connected in series. In addition, since the cell chamber 5 which accommodated the 1st spacer 7 does not function as a cell, it is not necessary to inject electrolyte solution and it is not necessary to provide a control valve. Is an open state, and as a result, the internal pressure of the cell chamber 5 in which the first spacer 7 is accommodated is the same as the atmospheric pressure.

  When such a battery 1 'is charged and left, in the cell chamber 5 in which the cells C1, C5, and C6 are stored, as described above, the oxygen gas retained in the cell chamber 5 is negative electrode active material. However, the internal pressure of the cell chamber 5 housing the adjacent first spacer 7 is the same as the atmospheric pressure.

  Therefore, when the cell chamber 5 in which the cells C1, C5, and C6 are stored is in a reduced pressure state, as shown in FIG. 3, the cell chamber 5 in which the cells are stored and the first spacer as a dummy cell. 2 between the cell chamber 5 storing the cell 7, that is, in the example shown in FIG. 2, the cell chamber 5 storing the cell C 1 and the cell adjacent to the cell chamber 5 and storing the first spacer 7 as a dummy cell. Stress is generated in the partition 4 of the chamber 5, the cell chamber 5 in which the cell C5 is stored, and the partition 4 in the cell chamber 5 in which the first spacer 7 is stored as a dummy cell, as shown in FIG. Further, these partition walls 4 are deformed in the direction of the cell chamber 5 in which the cell C1 is stored and in the direction of the cell chamber 5 in which the cell C5 is stored.

  The battery case 2 shown in FIG. 1 to FIG. 3 is designed for a 12V battery on the assumption that six cells C1 to C6 are accommodated in all six cell chambers 5, so Since all the cell chambers 5 are similarly decompressed, it is assumed that no pressure difference is generated between the cell chambers 5. Therefore, the thickness t 1 of the partition wall 4 is parallel to the outer wall of the battery case 2, for example, the partition wall 4. It is designed to be equal to or thinner than the thickness t2 of the battery case wall 2a (that is, t1 ≦ t2).

  Therefore, due to the internal pressure difference as described above, the partition wall 4 is likely to be deformed. When the battery 1 ′ is left for a long time with the partition wall 4 deformed, the partition wall 4 may be deformed or cracks may occur. . In addition, the battery case wall 2b connected to the partition wall 4 or a crack occurs between the partition wall 4 and the bottom wall (not shown) of the battery case 2, and the electrolyte inside leaks out, and the cells C1 and C5 When the negative electrode is oxidized, the capacity of the battery 1 'is rapidly deteriorated.

  In addition, such deformation of the partition walls 4 applies a compressive force to the cells C1 and C5. When the electrode plate surfaces of the electrode plates (not shown) constituting the cells C1 and C5 are parallel to AA ′ shown in FIG. 3 (that is, parallel to the battery case wall 2a), the cells C1 and C5 Is higher than the group pressure of the cell C6, a group pressure difference is generated between the cells C1 and C5 and the cell C6.

  Generally, in a control valve type lead storage battery composed of a plurality of cells, when the group pressure of the cells varies, the capacity difference due to the variation of the group pressure may be expanded by repeating charging and discharging, resulting in a short life. From the viewpoint of battery life, the group pressure difference due to the deformation of the partition walls 4 as described above adversely affects the life.

  Further, when the electrode plate surfaces of the electrode plates (not shown) constituting the cells C1 and C5 are parallel to BB ′ shown in FIG. 3 (that is, parallel to the battery case wall 2b), The side part is deformed by the partition wall 4, and as a result, the positive electrode plate and the negative electrode plate are internally short-circuited, and the capacity of the battery 1 'is rapidly reduced.

  The present invention relates to the deformation of the partition wall as shown in FIG. 3 which occurs in a control valve type lead storage battery having a cell chamber which does not contain a cell in the battery case as shown in FIG. An object of the present invention is to suppress the occurrence of battery defects due to deformation of the partition walls.

  In order to solve the above-mentioned problems, the invention according to claim 1 of the present invention is that the battery case is partitioned into a plurality of cell chambers by partition walls, the cell chambers are arranged in a row, and at least one of the cell chambers. The first spacer is accommodated in the cell chamber except for the cell chamber in which the first spacer is accommodated, and a cell composed of a positive electrode plate, a separator and a negative electrode plate functioning as a battery cell is accommodated in the cell chamber. A control valve type lead-acid battery characterized in that a second spacer in the form of a beam is arranged in a cell chamber in which the cells are accommodated in a cell chamber in which the cells are accommodated in the cell chamber in which the cells are accommodated. It is.

  Further, the invention according to claim 2 of the present invention is the control valve type lead-acid battery according to claim 1, wherein a groove is provided on a surface of the second spacer facing the partition wall and / or the inner wall of the battery case, A configuration is shown in which a rib-like projection is provided on the partition wall and the inner wall, and the rib-like projection is accommodated in the groove portion, whereby the second spacer is fitted to the rib-like projection.

  Furthermore, the invention according to claim 3 of the present invention is the control valve type lead-acid battery according to claim 1 or 2, wherein at least a pair of rib-shaped protrusions are provided on the partition wall and the inner wall, and the rib-shaped protrusions are provided between the rib-shaped protrusions. The end portion of the second spacer is accommodated.

  According to the configuration of the present invention, deformation and cracks of the partition walls 4 can be remarkably suppressed. In addition, this makes it possible to suppress electrolyte leakage caused by deformation or cracking of the partition walls 4, life reduction, and capacity reduction due to an internal short circuit.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment of the present invention)
FIG. 4 is a diagram showing a cell storage state in the battery case 2 of the control valve type lead storage battery (hereinafter, battery 11) according to the first embodiment of the present invention. The actual battery 11 of the present invention has a known lid, control valve, and terminal in the battery case 2, but these configurations are not different from those of a known control valve type lead storage battery. 4 shows the cell storage state in the battery case 2 and the storage state of the first spacer 7 and the second spacer 12 in the cell chamber 5, which is a configuration characterizing the present invention.

  In the battery 11 of the present invention, the inside of the battery case 2 is partitioned into a plurality of cell chambers 5 by the partition walls 4. In addition, although the example shown in FIG. 4 has shown the example where the inside of the battery case 2 was divided into six cell chambers 5, the number of the cell chambers 5 should just be plural, and the number is as follows. The present invention is not limited to this embodiment.

  The plurality of cell chambers 5 are arranged in a row inside the battery case 2. A first spacer 7 as a dummy cell is accommodated in at least one cell chamber 5 of the plurality of cell chambers 5. The first spacer 7 is housed for the purpose of maintaining the group pressure of the cells C1 and C5 housed in the adjacent cell chamber 5, and is made of a lightweight material having a low apparent density such as foamed urethane, for example. Needless to say, a material having a strength capable of maintaining the group pressure is used.

  In the cell chambers 5 excluding the cell chamber 5 in which the first spacers 7 are accommodated, cells C1, C5, and C6, which function as battery cells, each including a positive electrode plate, a separator, and a negative electrode plate (not shown) are provided. Each is stored. The cell C1, the cell C5, and the cell C6 have a configuration in which the positive electrode plate and the negative electrode plate described above are stacked with a separator interposed therebetween. However, in FIG. Such a cell shape expression is commonly used in other embodiments described later.

  Cell C1, Cell C5 and Cell C6 are respectively provided with a positive electrode strap for collectively welding current collecting ears (not shown) of the positive electrode plate and a negative electrode strap 6 'for collectively welding current collecting ears (not shown) of the negative electrode plate. In the example shown in FIG. 4, a negative pole 9 ′ connected to a battery terminal (not shown) provided outside the battery 11 is led out from the negative strap 6 ′ of the cell C <b> 1. Similarly, the positive pole 9 connected to the battery terminal is derived from the positive strap 6 of the cell C6. The configuration of the positive pole 9 and the negative pole 9 'is not different from that of a conventional control valve type lead storage battery.

  In the battery 11 of the present invention, a second beam that is adjacent to the cell chamber 5 in which the first spacer 7 is accommodated and is arranged in the cell chamber 5 in which the cells C1, C5, and C6 are accommodated in the arrangement direction of the cell chambers 5. The spacer 12 is arranged.

  Then, as shown in FIG. 4, the cell C1 and the cell C5 sandwiching the cell chamber 5 in which the first spacer 7 is accommodated are connected by the connection body 3 and the connection bar 8, and the first spacer 7 is accommodated. The cell C5 and the cell C6 adjacent to each other without being sandwiched between the cell chambers 5 are connected by the connection body 3 as in the conventional control valve type lead storage battery.

  According to the configuration of the present invention as described above, even when the cells C1, C5, and C6 are depressurized as shown in FIG. Cracks in the partition wall 4 and the battery case wall 2b or the bottom wall (not shown) of the battery case 2, and leakage due to this are suppressed. Moreover, the capacity | capacitance fall of the cell by the oxidation of the negative electrode plate by a crack can be suppressed. Furthermore, since the deformation of the partition walls is suppressed, variations in the group pressures of the cells C1, C5, and C6 that cause a short life of the battery 11 and a rapid capacity reduction are suppressed. Further, since the end of the electrode plate is not deformed by the deformation of the partition wall 4 to cause an internal short circuit, the battery voltage is adjusted by housing the first spacer 7 as a dummy cell in the battery case 2. The reliability of the control valve type lead storage battery can be remarkably improved.

  It is obvious that the second spacer 12 should be made of a material having sufficient strength to suppress deformation of the partition wall 4 and having acid resistance. For example, the second spacer 12 is formed as shown in FIG. It is good also as a block-shaped PP resin lump as shown in. The shape of the second spacer shown in FIG. 4 is merely an example, and it is obvious that other shapes can be adopted as long as the shape of the partition 4 can be suppressed.

(Second embodiment of the present invention)
FIG. 6 is a diagram showing a configuration of a control valve type lead storage battery (hereinafter referred to as battery 21) according to the second embodiment of the present invention.

  The battery 21 has the structure of the battery 11 described above and a structure for fixing the second spacer 12 to the cell chamber 5. That is, in the battery 21, the groove 12 a is formed at both ends of the second spacer 12 in the cell arrangement direction, and is accommodated in the groove 12 a on the partition wall 4 and / or the inner wall of the battery case wall 2 a facing the groove 12 a. The rib-like protrusion 2c is disposed.

  According to such a configuration of the battery 21, in addition to the operational effects obtained by the battery 11, there is an effect that the positioning and fixing of the second spacer 12 inside the cell chamber 5 can be easily performed. In addition, even if a severe impact or vibration is applied to the battery 21, the position of the second spacer 12 does not shift inside the cell chamber 5 and does not shift from the partition wall 4 or the battery case wall 2a. Can be obtained stably without impairing the process.

(Third embodiment of the present invention)
FIG. 7 is a diagram showing the configuration of a control valve type lead storage battery (hereinafter referred to as battery 31) according to the third embodiment of the present invention.

  The battery 31 has a structure for fixing the second spacer 12 to the cell chamber 5 in addition to the configuration of the battery 11. That is, at least a pair of rib-shaped protrusions 2c are provided on the surfaces of the partition wall 4 and the battery case wall 2a facing both ends of the second spacer 12, and the end of the second spacer 12 is positioned between the rib-shaped protrusions 2c. It has the composition to do.

  According to the configuration of the battery 31, in addition to the operational effects obtained by the battery 11, the position of the second spacer 12 in the cell chamber 5 is the same as that of the battery 21, even if severe impact or vibration is applied to the battery 31. Therefore, it can be stably obtained without impairing the effects of the present invention.

(Fourth embodiment of the present invention)
FIG. 8 is a diagram showing the configuration of a control valve type lead storage battery (hereinafter referred to as battery 41) according to the fourth embodiment of the present invention.

  The battery 41 has the configuration and operational effects of the battery 11, the battery 21, and the battery 31 described above. That is, the groove 12a is formed at both ends of the second spacer 12 in the cell arrangement direction, and the rib 12a is provided in the groove 12a in the partition wall 4 and the battery case wall 2a. By positioning both ends of the spacer in a pair of rib-shaped protrusions 2c provided on the partition wall 4 and the battery case wall 2a, the positioning and fixing of the second spacer 12 in the cell chamber 5 can be made stronger It can be.

  Further, the battery 41 has the same function and effect as the battery 11.

  In the first to third embodiments described above, the example in which the cell chamber 5 is six has been described. However, the present invention can be applied as long as the number is two or more.

  In the first to third embodiments described above, there are six cell chambers 5 and three first spacers 7 are arranged between the cells C1 and C5. The number of spacers of 1 may be appropriately selected so that a desired voltage can be obtained with an upper limit of 1 less than the number of cell chambers 5 and 1 as a lower limit. The selection of the cell chamber 5 to be stored may be arbitrary. However, depending on this selection, the number of the second spacers 12 to be used increases. Therefore, when a plurality of the first spacers 7 are used, it is preferable to store them in the continuous cell chamber 5 as much as possible.

  As described above, according to the configuration of the present invention, in the control valve type lead storage battery in which the voltage can be adjusted by storing the dummy cell in the cell chamber and the battery case is shared, the cell storing the cell The deformation of the partition wall of the chamber suppresses breakage of the battery case, leakage due to this, and a decrease in the capacity of the cell, and also suppresses variation in group pressure applied to the cell, thereby suppressing a short life. Depending on the storage direction of the electrode plate, the deformation of the partition wall 4 may deform the end of the electrode plate, causing the cell to short-circuit internally, resulting in a decrease in capacity. Can be solved.

  Hereinafter, the effects of the present invention will be described with reference to examples.

(Comparative battery A)
The battery A of the comparative example is a battery 1 ′ having the configuration shown in FIG. A glass mat separator comprising six positive electrode plates filled with a positive electrode active material in a positive electrode lattice made of Pb-Sn-Ca alloy and seven negative electrode plates filled with a negative electrode active material in a negative electrode lattice made of Pb-Sn-Ca alloy. Then, the cells were alternately stacked to form a cell.

  This cell is stored in the first, fifth, and sixth cells from the negative electrode terminal side of the 12V ABS resin battery case in which six cell chambers are arranged in a row, and the remaining second, third, and fourth cells. Is a battery containing a first spacer 7 made of urethane foam. The battery 1 'is a 6V battery because 3 cells are housed in a 12V battery case and connected in series, and the 10 hour rate rated capacity is 100Ah.

(Battery B of the present invention example)
The battery B of the example of the present invention is the battery 11 having the configuration shown in FIG. In the battery B of the present invention, the second spacer 12 having a rectangular parallelepiped shape made of ABS resin is arranged in a beam shape in a cell chamber in which the cell is accommodated.

(Battery C of the present invention example)
The battery C of the example of the present invention is the battery 21 having the configuration shown in FIG. The battery C, like the battery B, has a second spacer 12, but a groove 12 a is formed at both ends of the second spacer 12, and the groove 12 a and rib-shaped protrusions provided on the battery case wall 2 a and the partition wall 4. 2c is fitted and fixed.

(Battery D of the present invention example)
The battery D of the example of the present invention is a battery 31 having the configuration shown in FIG. The battery D has the second spacer 12 like the battery B, but has a configuration in which both end portions of the second spacer 12 are sandwiched and fixed by rib-shaped protrusions 2 c provided on the battery case wall 2 a and the partition wall 4. .

(Battery E of the present invention example)
The battery E of the present invention example is a battery 41 having the configuration shown in FIG. The position of the cell chamber 5 that houses the first spacer 7 is not different from the batteries A to E. Therefore, the position of the cell chamber 5 that accommodates the cell is also different from the batteries A to E. There is no.

  In the battery E, a groove 12a is provided at both ends of the second spacer 12, and a rib-like protrusion 2c provided on the battery case wall 2a and the partition wall 4 is fitted in the groove 12a. Both side portions of both ends of the spacer 12 are sandwiched and fixed by a pair of rib-shaped protrusions 2c.

  In each of the above batteries, the thickness of the battery case wall 2a and the battery case wall 2b is 5.0 mm, and the thickness of the partition wall 4 is 2.0 mm. The rib-shaped protrusion 2c has a height of 1.0 mm and a width of 1.0 mm, and is formed in a continuous line from the bottom of the cell chamber 5 to the upper surface of the negative electrode strap 6 ′.

Example 1
After confirming the capacity of each of the batteries A to E and confirming that the initial capacity is 100 Ah or more, the batteries are fully charged, and then the batteries are placed in a 25 ° C. environment for 1 to 3 months. After leaving it to stand, the appearance and remaining capacity of each battery were confirmed. The results are shown in Table 1.

  From the results of Table 1, cracks occurred in the battery A of the comparative example at the portion where it intersected with the partition wall on the bottom wall of the battery case during standing, and liquid leakage occurred from the cracks. In addition, the remaining capacity also rapidly decreases with the standing period, and it is considered that the capacity decrease due to the oxidative deterioration of the negative electrode plate due to the leakage of liquid and the lack of airtightness in the cell chamber. In addition, the remarkable deformation | transformation was recognized by the partition.

  In the example of the present invention, there was no abnormality in the battery appearance, no liquid leakage occurred, and the airtightness of the cell chamber was maintained. The remaining capacity decreases with the standing period, but such a decrease is in the category of self-discharge and has no problem.

(Example 2)
Next, each of the batteries A to E described above was newly prepared, and in the same manner as in Example 1, after the capacity was confirmed, the batteries were fully charged. Then, after deliberately applying an impact to each battery, the appearance and remaining capacity of the battery when it was left under the same conditions as in Example 1 were confirmed. The applied impact was dropped three times from a height of 10 cm on the concrete floor using the battery case wall 2b of the battery case 2 of each battery as a collision surface. The results in Example 2 are shown in Table 2.

  From the results shown in Table 2, the battery of the comparative example showed the same result as that of Example 1, but it was speculated that the generation of cracks was promoted by the impact applied before standing, especially because the capacity was drastically decreased. The

  On the other hand, in the example of the present invention, a minute crack was generated at the portion where the battery B intersected with the partition wall of the bottom wall of the battery case, but it was not enough to cause leakage. However, the airtightness was lost due to the minute cracks, and the capacity was decreased more than other batteries C to E. When this battery was disassembled, the position of the second spacer 12 was slightly shifted due to the drop impact, and it is presumed that the effect of suppressing deformation of the partition wall 4 during decompression was lowered.

  On the other hand, the batteries C to D were stored in a very good state without any significant decrease in battery appearance and remaining capacity regardless of the presence or absence of impact. Although these batteries were also disassembled, it is considered that the effect of the present invention was stably obtained because the second spacer 12 was not displaced and was fixed at a regular position in the cell chamber.

  As described above, the batteries of Examples B to E according to the present invention do not generate cracks due to the reduced pressure even when left after being charged, as compared with the battery A of the comparative example, and a battery having high reliability can be obtained. It was. In particular, for the batteries C to E, even when an impact was applied, the effect of the present invention was not impaired, and a battery excellent in impact resistance could be obtained.

  The present invention is useful as a control valve type lead acid battery for various applications.

The figure which shows the cell accommodation state to the battery case of a control valve type lead acid battery The figure which shows the cell accommodation state to the battery case of the control valve type lead acid battery which has a dummy cell The figure which shows the state which the partition of the control valve type lead acid battery which has a dummy cell deform | transformed The figure which shows the control valve type lead acid battery by the 1st Embodiment of this invention. The figure which shows the state which the cell chamber of the control valve type lead acid battery by the 1st Embodiment of this invention pressure-reduced. The figure which shows the control valve type lead acid battery by the 2nd Embodiment of this invention. The figure which shows the control valve type lead acid battery by the 3rd Embodiment of this invention. The figure which shows the principal part of the control valve type lead acid battery by the 4th Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,1 'Battery 2 Battery case 2a Battery case wall 2b Battery case wall 2c Rib-like protrusion 3 Connection body 4 Partition 5 Cell chamber 6 Positive electrode strap 6' Negative electrode strap 7 First spacer 8 Connection bar 9 Positive electrode column 9 'Negative electrode column 11 Battery 12 Second Spacer 12a Groove 21 Battery 31 Battery 41 Battery C1, C2, C3, C4, C5, C6 Cell

Claims (3)

The inside of the battery case is partitioned into a plurality of cell chambers by partition walls,
The cell chambers are arranged in a row,
A first spacer is accommodated in at least one of the cell chambers,
In the cell chambers excluding the cell chamber in which the first spacer is accommodated, a cell composed of a positive electrode plate, a separator, and a negative electrode plate, which functions as a battery cell, is accommodated.
A control valve type lead-acid battery, wherein a beam-shaped second spacer is arranged in the cell arrangement direction adjacent to the cell chamber containing the first spacer and in the cell chamber containing the cell. . Providing a groove on a surface of the second spacer facing the partition wall and / or the inner wall of the battery case;
Providing rib-like projections on the partition wall and the inner wall;
The control valve type lead-acid battery according to claim 1, wherein the second spacer is fitted into the rib-shaped protrusion by accommodating the rib-shaped protrusion in the groove. 3. The control valve-type lead according to claim 1, wherein at least a pair of rib-shaped protrusions are provided on the partition wall and the inner wall, and an end of the second spacer is accommodated between the rib-shaped protrusions. Storage battery.

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