JP2003197279A - Sealed storage battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress temperature rises and temperature fluctuations of a sealed storage battery. <P>SOLUTION: In the sealed storage battery having a battery case 2 into which electrode plate groups are inserted and a cap 3 applied to this, a ventilation hole 8 vertically penetrated through the storage battery is formed at the battery case and the cap, and this is the sealed storage battery in which a ventilation device 4 forcibly sending the air toward the ventilation hole is installed. In addition, an opening part 11 opens to the short side face wall of the battery case 2, and is communicated with the ventilation hole 8. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a storage battery that completely shields a storage battery from the outside air, and a safety valve device that releases the generated gas to the outside only when the internal pressure becomes higher due to the generated gas. The present invention relates to a sealed storage battery having the same.

[0002]

2. Description of the Related Art Recently, with the increase of electrical components in automobiles,
Power consumption tends to increase significantly. Also, improving fuel efficiency and reducing exhaust gas are major issues. Therefore, the power supply voltage was increased from the conventional 14V to 42V, and at the same time 36V
Introducing a simple hybrid system using batteries has been studied to solve fuel consumption and exhaust gas problems, and some have already put it to practical use.

As a 36V battery used in this system, a sealed lead acid battery is promising in terms of cost. Further, the external dimensions are considered to be the standard D size or B size (usually called in this way by the alphabet indicating the width × height division in the storage battery model display).

Such a 36V battery uses two sealed lead-acid batteries in close contact with each other using a 9-cell monoblock battery case in which one battery case is divided into partitions by a partition. The inside of one battery case was divided into two parts at the center by partition walls, and each of the two divided chambers was separated by eight partition walls orthogonal to the center partition wall to divide the inside of the battery container into a field shape. A sealed lead acid battery using an 18-cell monoblock battery case is adopted.

[0005]

SUMMARY OF THE INVENTION Sealed lead-acid batteries are
Oxygen gas generated from the positive electrode at the end of charging is reacted with the negative electrode to reduce the amount of the electrolytic solution, thereby completely reducing maintenance. In addition, since the amount of the electrolytic solution is limited to a level such that a glass separator having a high liquid absorbing property is used and there is no free liquid, it is possible to make the position free. Therefore, it is becoming increasingly used for automobiles instead of the liquid lead acid battery. However, the reaction of consuming the oxygen gas generated in the positive electrode during charging in the negative electrode is accompanied by great heat generation. In addition, the heat capacity of the battery is small because the amount of electrolyte is reduced in order to smoothly consume oxygen gas. Therefore, there is a drawback that the battery temperature easily rises.

Further, in the D-size or B-size integrated battery, the conventional 6 cells are arranged in close contact with 18 cells in the 36V battery. Therefore, compared to the conventional
The temperature rises remarkably, and especially in the central part, the temperature rise becomes more remarkable than in the periphery. As a result, a temperature difference occurs between cells. Since the cells with high temperature and the cells with low temperature have different charging efficiency and gas absorption performance, the state of charge between cells is different, and an unbalanced state spreads during repeated charging and discharging. Then, the temperature of the cell in the central portion is remarkably increased and the cell is overcharged, which causes the entire battery to reach the end of its life.

To solve this problem, it is necessary to reduce the temperature of the entire battery and make it uniform.

[0008]

In order to solve the above-mentioned problems, according to the invention as set forth in claim 1, the battery case and the lid are formed with ventilation holes passing vertically through the storage battery, and It is equipped with a device that forcibly blows air toward the pores,
The invention according to claim 2 is one in which the device for forcibly blowing air is provided on the upper part of the storage battery, and the invention according to claim 3 is for performing the air blowing at a wind speed of 0.5 m / sec or more, In the invention according to claim 4, the upper opening area of the ventilation holes on both end sides of the storage battery is smaller than that of the central part, and in the invention according to claim 5, the heat insulating portion is formed on the end side surface of the storage battery. It is a thing.

[0009]

[Function] The storage battery is provided with ventilation holes that open above and below the storage battery.
By blowing air into the vent hole with a blower, the outside air can be sent into the vent hole to cool the storage battery through the vent hole, thereby suppressing the temperature rise as a whole and making it uniform. Is.

In the present invention, it is necessary to form the ventilation holes penetrating up and down the storage battery, but the significance of this is not only that the ventilation holes extending from the top surface of the lid to the bottom surface of the battery case are formed. The present invention also includes a vent hole extending from the top surface of the lid to the battery case side surface, a vent hole extending from the lid side surface to the battery case bottom surface, a vent hole extending from the lid side surface to the side surface opposite to the battery case, Various embodiments can be adopted without departing from the idea.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention relates to a battery case in which an electrode plate group is housed and a seal type storage battery in which an opening at the upper part of the battery case is closed by a lid. The storage battery is provided with an air blower that forms a ventilation hole that blows air toward the ventilation hole, and blows air to the ventilation hole to suppress an increase in temperature of the storage battery.

A detailed embodiment will be described below with reference to the drawings.

[0013]

[Embodiment 1] FIG. 1 shows a sealed lead-acid battery 1 according to an embodiment of the present invention.
FIG. Reference numeral 2 is a battery case made of synthetic resin such as polypropylene, 3 is a lid made of the same material, and 4 is a blower.

The blower device 4 is attached to the upper surface of the lid 2, 5 is a housing portion accommodating a fan 6, a motor, a control circuit and the like (not shown), and 7 is opened on the upper surface of the lid of the lead storage battery 1. It is a hood part for blowing air which covers the ventilation holes 8. Blower 4
For attachment to the lid 2, the blower hood portion 7 and the housing portion 5 were attached to the upper surface of the lid 2 of the lead storage battery 1 manufactured by a conventional method by heat fusion or the like. As a control circuit not shown,
It is a control circuit or the like that detects the storage battery temperature and rotates the fan 6 to blow air only when the temperature exceeds a predetermined temperature.

A fan 6 is housed in the casing 5, and electric power is supplied to the motor from a terminal 9 of the storage battery. Reference numeral 10 is a connecting wire for connecting the motor and the terminal, which is also connected from the opposite terminal on the opposite side. Reference numeral 11 denotes a side surface opening portion opened on the short side wall of the battery case 2 and communicates with the ventilation hole 8.

FIG. 2 shows a lead storage battery 1 from which the blower is removed.
showed that. The lead storage battery 1 has a vent hole 8 formed in the center along the long side surface direction. The vent hole 8 is opened on the upper surface of the lid 3, extends through the lid 3 to the battery case 2, and is opened on the bottom surface of the battery case 2 and lower portions of both short side surfaces to form an opening 11. Further, the vent holes 8 opening on the upper surface of the lid 3 divide the vent holes 8 located at the top of the lid 3 and the battery case 2 into three evenly by two ribs 12. And the ventilation hole 8
The battery case 2 divided into two parts is integrated by the rib 12 and the short side wall of the battery case 2. The vent hole 8 had a width of 10 mm over the entire area.

In the battery case 2, each of the two divided chambers is divided into partition cells by partition walls into nine cell chambers 13 in total, and a total of 18 cell chambers 13 are formed. A 36 V sealed-type lead-acid battery is obtained by accommodating a group of electrode plates in which positive and negative electrode plates each having a positive and negative active material filled and coated on a substrate made of a calcium alloy are alternately laminated and connected in series.

The electrode plate groups in the cells in each of the two halves of the battery case 2 are connected in series through the holes formed in the partition walls, and the connections between the cells are located at the respective ends. Connection was made by projecting the poles from the chamber to the upper surface of the lid 3 and connecting the poles with a connecting plate (not shown).

Using this sealed lead-acid battery and the conventional sealed lead-acid battery without vents and blowers, charging / discharging was performed at room temperature under conditions of a state of charge (SOC) of 70% and a depth of discharge (DOD) of 5%. This was repeated twice, and the temperature change at the 200th time was measured. At this time, the temperature change was also measured when the air velocity was changed by the air blower. The results are shown in Table 1.

In Table 1, the external temperature is the temperature at the outer position inside each cell chamber of one chamber of the battery case divided into two, the column center temperature is the temperature at the vent hole side, and the column internal temperature is the outside. The cell room temperature at the intermediate position between the position and the ventilation side position is 2
The temperature range of the fifth cell chamber is shown in order from the first cell chamber located at one end of each of the divided cell chambers of the cell case to the other end. 9 from the 6th cell chamber
Since the second cell chamber and each cell chamber of the other chamber of the battery case are located at the target positions, they are in substantially the same temperature range.

[0021]

[Table 1]

As is clear from Table 1, the temperature is suppressed to be low as a whole by blowing air, and the temperature rise is suppressed as compared with the case where there is a ventilation hole shown as a comparative example but no ventilation. Further, when the wind speed is 0.5 m / sec or more, the effect is great.

Further, the difference between the maximum temperature and the minimum temperature is 17 ° C. (61-44) of the conventional product and 14 ° C. (57-4) of the comparative example.
Compared to 3), the product of the present invention is as small as 12 to 14 ° C., and variation in temperature is suppressed.

[0024]

[Embodiments 2 to 3] Next, in the above-mentioned Embodiment 1, it is located at the end of the vent hole 8 opened on the upper surface of the storage battery lid 2.
It corresponds to the sealed lead-acid battery (Example 2) in which only the portions corresponding to the first and ninth cell chambers are closed, and to the first to third and seventh to ninth cell chambers. Block the part,
A sealed lead-acid battery (Example 3) was produced in which only the portions corresponding to the fourth to sixth cell chambers were opened, and charging / discharging was repeated 200 times under the same conditions as described above. The temperature change was measured. The wind speed at this time is 1 m
/ Sec. The results are shown in Table 2. In addition, the results at a wind speed of 1 m / sec in Table 1 are shown as Example 1 in the table.

The method of closing each part of the vent hole opened on the upper surface of the lid 2 is such that it is formed so as not to be opened at the time of molding of the lid, or the upper surface of the lid is covered with a lid to cover the corresponding portion. It can be easily manufactured by molding the corresponding portion so as not to open.

[0026]

[Table 2]

As is apparent from Table 2, when the vent holes on the end side are closed, the temperature difference between the cells is reduced, and
The temperature difference between each position is also narrowed and the temperature variation is reduced. This tendency was also observed when the opening size of the vent hole on the end side was narrowed and the area thereof was reduced.

Further, the same tendency is observed when a heat insulating material is attached to the short side wall where the vent hole of the battery case is opened except for the opening, or when only the short side wall is thicker than others. Even when the heat insulating portion is formed on these short side surfaces, the temperature variation can be reduced. Of course, these configurations can also be used in combination.

As the blowing device 4, as shown in the diagram of FIG. 3, four long blade members 14 may be rotated over the entire width of the lead storage battery 1 in the long side direction. Reference numeral 15 is a motor.

Further, FIG. 4 shows a diagram of another embodiment, in which the casing 5 of the blower device 4 may be provided in the upper center of the storage battery to blow air. In this embodiment, the vent hole 8 is divided into nine equal parts by a large number of ribs 12.

FIG. 5 shows still another embodiment, in which the ventilation hole penetrates from the upper surface of the lid to one short side surface of the battery case, and the housing portion of the blower 4 is provided at a portion opened to the short side surface of the battery case. 5 is provided so that air is blown from below the lead storage battery 1 to above the lid 2.

3 to 5 show the first embodiment shown in FIG.
4 is a cut end line diagram of a portion corresponding to a cross section taken along line AA of the sealed lead-acid battery of FIG. Moreover, the same reference numerals as those in FIGS. 1 and 2 indicate the same components.

[0033]

As described above, according to the present invention, the temperature rise of the storage battery can be suppressed, the temperature variation can be suppressed small, and the temperature rise of the storage battery and the deterioration due to the temperature variation can be suppressed as much as possible. The effect of.

[Brief description of drawings]

FIG. 1 is a perspective view of a sealed lead-acid battery provided with an air blower according to one embodiment of the present invention.

FIG. 2 is a perspective view of a sealed lead-acid battery without the air blower according to the first embodiment of the present invention.

FIG. 3 is a partial line diagram of a main part of a cut end surface showing another embodiment.

FIG. 4 is a partial line diagram of a main part of a cut end surface showing still another embodiment.

FIG. 5 is a cut end face diagram showing another embodiment.

[Explanation of symbols]

1 ... Sealed lead acid battery 2 ... battery case 3 ... Lid 4 ... Blower 8 ... Vent

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] July 1, 2002 (2002.7.1)

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0031

[Correction method] Change

[Correction content]

FIG. 5 shows still another embodiment, in which the ventilation hole penetrates from the upper surface of the lid to one short side surface of the battery case, and the housing portion of the blower 4 is provided at a portion opened to the short side surface of the battery case. 5 is provided so that air is blown from below the lead storage battery 1 to above the lid 2. The ribs 12 close to the blower 4 are bent at their lower ends to slightly close the lower end openings of the ventilation holes 8 divided by the ribs 12 on the blower 4 side to selectively blow air to the ventilation holes 8 close to the blower 4. The blower device 4 prevents the air from being blown and spreads widely to the side of the short side opposite to the side where the blower 4 is attached.

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 2

[Correction method] Change

[Correction content]

[Fig. 2]

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hiroyuki Iizuka             Fukushima Prefecture Iwaki City Joban Shimo-Funao Pile 23-6               Furukawa Battery Co., Ltd., Iwaki Plant F term (reference) 5H011 AA02 AA13 BB03 DD11 KK00                 5H031 AA01 BB03 CC05 HH00 HH08                       KK02 KK08

Claims (5)

[Claims] 1. A sealed storage battery comprising a battery case having an electrode plate group inserted therein and a lid provided on the battery container, wherein the battery container and the lid are formed with vent holes extending vertically through the battery.
A sealed storage battery, comprising a blower device for forcedly blowing air toward the ventilation hole. 2. The sealed storage battery according to claim 1, wherein a device for forcibly blowing air toward the ventilation hole is provided on the upper portion of the storage battery. 3. The sealed storage battery according to claim 1, further comprising a device for blowing air at a wind speed of 0.5 m / sec or more. 4. The sealed storage battery according to claim 1, wherein the upper opening area of the ventilation holes on both end sides of the storage battery is smaller than the upper opening area of the central ventilation hole. 5. The seal type storage battery according to claim 1, wherein a heat insulating portion is formed on a short side surface of the storage battery.