JPH1092394A - Mono-block battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To approximate a room temperature in each cell chamber and reduce dispersion in the temperature between the cell rooms by providing a heat radiation promoting member with its good thermal conductivity capable of thermal transmission from a material of a battery jar on the battery jar exterior wall of a cell chamber with its small surface area of the battery jar exterior wall. SOLUTION: For a mono-block type battery jar 1, an inside of a battery jar exterior wall 2 is partitioned by bulkheads 3a, 3b, 3c, 3d, and 3e, and same six cell chambers 4a, 4b, 4c, 4d, 4e, and 4f are formed in an array. On an outer face of the exterior wall 2 on both sides of the cell chambers 4a and 4d on a center side on which the surface area of the exterior wall 2 is small, a heat radiation promoting member 5 with its thermal conductivity is so provided as to be thermally transmitted from a material of the battery jar 1. Thereby, heat radiation from the cell chambers 4a and 4d in which the surface area of the exterior wall 2 is small is promoted by the member 5, the temperatures in the cell chambers 4a, 4b, 4c, 4d, 4e, and 4f are approximate, and dispersion in the temperatures between the cell chambers can be reduced. Consequently, service life of a mono-block, enclosed lead storage battery can be extended.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a monoblock battery having a monoblock type battery case.

[0002]

2. Description of the Related Art In recent years, sealed lead-acid batteries have been widely used as power supplies for portable equipment and electric vehicles, and as backup power supplies for computers and the like. With these demands, it is also desired to increase the capacity and the life of the battery.

[0003] In a monoblock sealed lead-acid battery having a monoblock type battery case composed of a plurality of cell chambers arranged adjacent to each other in a row, it is necessary to suppress the variation between cells. It is thought to lead to longer life and higher capacity.

[0004] In particular, when the battery case is expanded at a high temperature in the cell at the end of the battery case, the pressing force applied to the electrode plate group tends to be lower than that in the central cell. Further, the cell chambers existing at the ends of the plurality of cell chambers arranged in a row have a larger area in contact with the external atmosphere than the central cell chamber, so that the moisture permeability increases. As described above, in the monoblock type sealed lead-acid battery having the monoblock type battery case, the cells at the end and the center are each separated by a decrease in group pressurization and a decrease in electrolyte due to moisture permeability. The capacity fluctuated, and the service life was short.

In order to solve such a problem, the outer wall of the battery case parallel to the partition is reinforced with a metal jig or the like, and ribs are provided on the outer wall of the battery case parallel to the partition. A method of increasing the strength of the tank was used.

[0006]

However, in such a conventional technique, in a situation where the battery temperature rises (during battery case formation, etc.), the end cell chamber on the outer wall of the battery case parallel to the partition wall has an external cell. Since the area in contact with the atmosphere is large, heat can easily escape to the outside, and a temperature difference from the central cell chamber occurs. In the case of a monobloc battery in which the outer wall of the battery case parallel to the partition walls is reinforced with a metal jig, etc., the metal has high thermal conductivity, so it is easier to dissipate heat and the temperature between the end cells and the center cell The difference is even greater. As a result,
Variations in the amount of electrolyte solution, the specific gravity of the electrolyte solution, the formation efficiency, and the like after the formation of the battery case were increased, and there was a problem that the life of the monoblock battery was shortened.

An object of the present invention is to provide a monoblock battery in which the temperature in each cell chamber is approximated and the variation in the temperature between cell chambers is reduced.

Another object of the present invention is to provide a monoblock battery capable of promoting heat radiation without reducing the volume of the cell chamber.

Another object of the present invention is to provide a monoblock battery capable of promoting heat radiation from a cell chamber in which heat is not easily radiated in a direction in which the cell chambers are arranged.

[0010] Another object of the present invention is to provide a monoblock battery in which a heat dissipation promoting member can be easily formed.

Another object of the present invention is to provide a monoblock battery capable of satisfactorily transferring heat from a battery case to a heat dissipation promoting member.

[0012]

SUMMARY OF THE INVENTION The present invention is to improve a monoblock battery having a monoblock type battery case having a plurality of cell chambers arranged adjacently in a row and having different surface areas of the battery case outer wall surface. is there.

In the monoblock battery according to the present invention, the battery case outer wall has a small surface area, and the battery case outer wall has a small surface area.
A heat dissipation promoting member having better heat conductivity than the material of the battery case is provided so as to be able to transfer heat.

With this configuration, heat radiation from the cell chamber having a small surface area of the outer wall of the battery case is promoted by the heat radiation promoting member, so that the temperatures in the respective cell chambers are approximated, and the temperature variation between the cell chambers is reduced. The battery life can be extended.

In this case, when the heat radiation promoting member is provided on the outer surface of the outer wall of the battery case, heat radiation can be promoted without reducing the volume of the cell chamber.

Further, when the heat dissipation promoting member is disposed in the concave portion on the outer surface of the battery case outer wall, the distance from the cell chamber having a small surface area of the battery case outer wall to the heat dissipation promoting member is shortened, and the heat transfer is further improved. Further, the heat radiation from the cell chamber having a small surface area of the outer wall of the battery case can be further promoted, and the temperature variation between the cell chambers can be further reduced.

Further, the concave portion is formed so that the depth becomes deeper in the order from the cell chamber at a position where heat radiation is easy in the direction in which the cell chambers are arranged to the cell chamber at a position where heat radiation is difficult, and the depth is formed in the concave portion. When a heat dissipation promoting member having a thickness corresponding to the thickness is arranged, the distance from the cell chamber having a small surface area of the battery case outer wall to the heat dissipation promoting member becomes closer to the cell room where the heat is hardly dissipated, and the heat dissipating in the cell room where the heat transfer is hard to dissipate. As a result, the temperature variation between the cell chambers can be further reduced.

When a metal plate is used as the heat dissipation promoting member, the present invention can be easily implemented. In the present invention, the metal plate is formed in a plate shape in advance, and includes a so-called foil or film having a small thickness.

When a sprayed layer formed by spraying a molten metal is used as the heat dissipation promoting member, the sprayed layer is integrated with the battery case, and heat transfer from the battery case can be performed well.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described based on an example in which the present invention is applied to a 12V-15Ah monoblock type sealed lead-acid battery using a monoblock type battery case having six cell chambers.

FIGS. 1 to 4 show the first configuration of the monoblock type battery case 1 used in the sealed lead-acid battery according to the present invention.
Or a fourth example. In this monoblock type battery case 1, the inside of the battery case outer wall 2 has partition walls 3a, 3b, 3c, 3
Six cell chambers 4a, 4 partitioned by d and 3e and having the same volume.
b, 4c, 4d, 4e, and 4f are formed in a line.
In such a monoblock type container 1, each cell room 4a,
Each of the cell chambers 4a, 4f at both ends in the arrangement direction of 4b, 4c, 4d, 4e, 4f is replaced with the remaining cell chambers 4b, 4c, 4d,
4e, the surface area of the battery case outer wall 2 is larger. In other words, each cell room 4b, 4c, 4d, 4e is connected to each cell room 4a,
The surface area of the outer container wall 2 is smaller than 4f. Electrode plates and an electrolytic solution are accommodated in these cell chambers 4a to 4f to form respective cells, and the openings of the cell chambers 4a to 4f are sealed with lids to form sealed lead storage batteries.

The first example of a monoblock type battery case 1 shown in FIG.
In the above, the heat dissipation promoting member 5 having better heat conductivity than the material of the battery case 1 can conduct heat to the outer surface of the battery case outer wall 2 on both sides of the central cell chambers 4c and 4d where the surface area of the battery case outer wall 2 is small. Is provided. In other words, each cell room 4a, 4
The battery case 1 is provided on the battery case outer wall 2 of the cell rooms 4c and 4d excluding the cell rooms 4a and 4f at both ends in the arrangement direction of b, 4c, 4d, 4e and 4f and the cell rooms 4b and 4e adjacent thereto. The heat dissipation promoting member 5 having better heat conductivity than the above material is provided so as to be able to transfer heat.

According to the sealed lead-acid battery using the monoblock type battery case 1 having such a structure, heat dissipation from the cell chambers 4c and 4d having a small surface area of the battery case outer wall 2 is promoted by the heat dissipation promoting member 5, Each cell room 4a, 4b, 4c, 4d, 4e, 4
f, the temperatures in the cell chambers 4a, 4b,
Variations in temperature among 4c, 4d, 4e, and 4f can be reduced, and the life of the monoblock sealed lead-acid battery can be extended. Each cell chamber 4a at both ends in the arrangement direction,
Radiation from the cell chambers 4b and 4e adjacent to the cell chambers 4b and 4e is released from the cell chambers 4a and 4c and the cell chambers 4d and 4d on both sides of the cell chambers 4b and 4e.
This is also performed after f. As in this example, the heat dissipation promoting member 5
Is provided on the outer surface of the battery case outer wall 2, heat radiation can be promoted without reducing the volume of the cell chamber.

The monoblock type battery case 1 of the second example shown in FIG.
In the above, concave portions 6 are provided on the outer surfaces of the battery case outer walls 2 on both sides of the central cell chambers 4c and 4d in which the surface area of the battery case outer wall 2 is small, and these concave portions 6 have better heat conductivity than the material of the battery case 1. The heat dissipation promoting member 5 is arranged and provided so as to be able to transfer heat. In other words, each cell room 4a, 4b, 4c, 4
cell chambers 4a, 4f at both ends in the arrangement direction of d, 4e, 4f
And the cell chambers 4c, excluding the cell chambers 4b and 4e adjacent thereto,
4d, a concave portion 6 is provided on the outer surface of the outer wall 2 of the battery case.
Are provided so as to be able to transfer heat.

As described above, according to the sealed lead-acid battery using the monoblock type battery case 1 having the structure in which the heat dissipation promoting member 5 is disposed in the concave portion 6 on the outer surface of the battery case outer wall 2, the surface area of the battery case outer wall 2 is obtained. The distance from the small cell chambers 4c and 4d to the heat dissipation promoting member 5 is shortened, the heat transfer is further improved, and the heat dissipation from the cell chambers 4c and 4d having a small surface area of the battery case outer wall 2 can be further promoted. Cell chambers 4a, 4b, 4c, 4d, 4e, 4
The temperature variation between f can be further reduced.

In the monoblock type battery case 1 of the third and fourth examples shown in FIGS. 3 and 4, the battery cells 4b, 4c, 4d, and 4e on both sides of the central cell chamber 4b having a small surface area of the battery case outer wall 2 are provided. A concave portion 6 is formed on the outer surface of the tank outer wall 2, and each of the cell chambers 4b, 4c, 4d, 4
e are formed so that the depth becomes deeper in the order from the cell chamber at a position where heat is easily dissipated to the cell chamber at a position where heat is hardly dissipated in the direction in which e is arranged. An accelerating member 5 is arranged. In other words, the cell chamber 4 excluding the cell chambers 4a, 4f at both ends in the arrangement direction of the cell chambers 4a, 4b, 4c, 4d, 4e, 4f.
A concave portion 6 is formed on the outer surface of the battery case outer wall 2 of b, 4c, 4d, and 4e.
The recesses 6 are formed in such a manner that the depth becomes deeper in the order from the cell chamber at the position where heat radiation is easy in the direction in which the cell chambers 4b, 4c, 4d and 4e are arranged to the cell chamber at the position where heat radiation is difficult.
Inside, a heat dissipation promoting member 5 having a thickness corresponding to the depth is disposed. In the case of FIG. 3, each cell chamber 4a, 4
f, cell chambers 4b and 4e adjacent to f
The recess 6 and the heat dissipation promoting member 5 are provided independently for c and 4d. On the other hand, in the case of FIG. 4, the cell chambers 4b, 4c, 4d, and 4e excluding the cell chambers 4a and 4f at both ends.
The concave portion 6 and the heat dissipation promoting member 5 are provided continuously over the battery case outer wall 2.

As described above, the recesses 6 are formed on the outer surfaces of the battery case outer walls 2 on both sides of the central cell chambers 4b, 4c, 4d and 4e where the surface area of the battery case outer wall 2 is small. The monoblock type battery case 1 has a structure in which the depth is increased in the order of the cell chambers 4c and 4d on the side, and the heat dissipation promoting member 5 having a thickness corresponding to the depth is arranged in the recess 6. According to the sealed lead-acid battery using the battery, the battery case outer wall 2
The cell chambers 4c, 4d in which the distance from the cell chambers 4b, 4c, 4d, 4e having a small surface area to the radiation promoting member 5 is difficult to dissipate.
The cell chambers 4c, 4d, which are closer to each other and hardly dissipate the heat, have better heat radiation, and the cell chambers 4a, 4b, 4c, 4
Variations in temperature between d, 4e, and 4f can be further reduced.

The monoblock type battery case 1 of each of the above examples is AB
It is formed of a synthetic resin such as S resin. Further, the heat dissipation promoting member 5 of each of the above examples is formed of a metal plate such as aluminum, copper, or iron, and is attached to the battery case 1 by an adhesive such as an epoxy-based adhesive so that heat can be transferred. When a metal plate is used as the heat dissipation promoting member 5, the present invention can be easily implemented.

Next, a sealed lead storage battery is assembled by accommodating an unpolarized electrode plate group and an electrolyte in each of the cell chambers 4a to 4f of the monoblock type battery case 1 of the first example shown in FIG. Chemical formation was performed. As the heat radiation promoting member 5, an A1 sheet having a thickness of 100 μm was used. Further, as a comparative product of the product of the present invention composed of a sealed lead storage battery having such a structure, a sealed lead storage battery formed into a battery case in a conventional battery case without the heat dissipation promoting member 5 was used as a comparative product. The battery formation conditions were continuous energization, the amount of power applied was 250%, and the formation time was 40 hours.

Table 1 shows the temperature difference between the end cell and the center cell of each battery during the formation of the battery case.
In the comparative product, there was a maximum temperature difference of about 9 ° C. between the end cell and the center cell. On the other hand, in the product of the present invention, the temperature difference was about 3 ° C., which was small. From this result,
It was found that the product of the present invention had smaller temperature variation between cells than the comparative product.

[0031]

[Table 1] Next, a sealed lead-acid battery was prepared by changing only the battery forming time to 20, 40, and 60 hours, and a discharge test was performed. The discharge conditions were a discharge current of 3.75 A and a cutoff voltage of 10.2 V.

FIG. 5 shows the relationship between the battery formation time and the discharge capacity obtained by this discharge test. The discharge capacity of the comparative product was reduced when the battery case formation time was shortened. on the other hand,
In the product of the present invention, no difference was observed in the discharge capacity of the battery even when the formation time was changed. This is because when the formation time is short, that is, when the current density of the formation current is large, the heat generation of the battery tends to increase. As a result, in a monoblock battery including a plurality of cell chambers, the temperature of the central cell chamber tends to be higher than that of the end cell chamber. If the formation is performed under the condition that the current density is increased, in a normal monoblock battery, the temperature difference between the end cell chamber and the center cell chamber is further increased, and variations between the cell chambers occur. However, in the monoblock battery of the present invention, the temperature of the central cell chamber is reduced by the provision of the heat dissipation promoting member 5 having good thermal conductivity on the outer wall of the battery case of the central cell chamber, and the temperature of the other cell is reduced. And the temperature variation between the cell chambers is small.

Next, a cycle life test was conducted using a battery having a formation time of 40 hours. Test conditions are temperature 25 ℃, discharge
The capacity was checked every 50 cycles at 3.75 A × 2 h and charge 1.5 A × 6 h.

FIG. 6 shows the results of the cycle life test. The life of the comparative product was 300 to 400 cycles, whereas the product of the present invention did not reach the life even after 600 cycles.

In each of the above examples, the case where a monoblock type container having six cell chambers is used has been described. However, the number of cell chambers is not limited to this, but is not limited to three or more. May be.

Further, in each of the above-described examples, an example in which a metal plate is used as the heat radiation promoting member 5 has been described. However, the heat radiation promoting member 5 is not limited to a metal plate, and may be formed of a sprayed layer by spraying a molten metal. it can. When the heat dissipation promoting member 5 is formed with such a sprayed layer, the sprayed layer becomes a monoblock type battery case 1.
The heat transfer from the battery case can be performed favorably.

In the above example, an example in which the present invention is applied to a sealed lead-acid battery has been described. However, the present invention is not limited to this, and a liquid-type lead-acid battery, Ni-Cd battery,
The same can be applied to a Ni-H battery or the like.

Hereinafter, constituent elements of some of the plurality of inventions described in this specification will be described.

(1) A monoblock battery having a monoblock type battery case having a plurality of cell chambers arranged adjacent to each other in the same volume in a row, wherein the monoblock battery has a plurality of cell chambers. A heat dissipation promoting member having better heat conductivity than the material of the battery case is provided on the outer wall of the battery case of the cell room except for each cell room and each of the adjacent cell rooms, so that heat can be transferred. Monoblock battery.

(2) A monoblock battery having a monoblock-type battery case having a plurality of cell chambers arranged adjacent to each other in the same volume in a row, wherein the monoblock battery has both ends in the arrangement direction of the cell chambers. A monoblock battery, wherein a heat dissipation promoting member having better heat conductivity than the material of the battery case is provided on the outer wall of the battery case of the cell room except each cell room so as to be able to transfer heat.

[0041]

As described above, in the monoblock battery according to the present invention, the heat dissipation promoting member having better heat conductivity than the material of the battery case is provided on the battery case outer wall of the cell chamber having a small surface area of the battery case outer wall. Is provided so that heat can be transferred, so that heat radiation from the cell chamber having a small surface area of the outer wall of the battery case is promoted by the heat radiation promoting member, so that the temperatures in the respective cell chambers are approximated, and the temperature variation between the cell chambers is reduced. It is possible to extend the life and increase the capacity of the monoblock battery.

[Brief description of the drawings]

FIG. 1 is a plan view showing a first example of a monoblock battery case used in a monoblock battery according to the present invention.

FIG. 2 is a plan view showing a second example of a monoblock battery case used in the monoblock battery according to the present invention.

FIG. 3 is a plan view showing a third example of a monoblock battery case used in the monoblock battery according to the present invention.

FIG. 4 is a plan view showing a fourth example of a monoblock battery case used in the monoblock battery according to the present invention.

FIG. 5 is a comparison diagram showing the relationship between battery formation time and discharge capacity of the product of the present invention and a comparative product.

FIG. 6 is a comparison diagram showing the results of a cycle life test of a product of the present invention and a comparative product.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Monoblock type battery case 2 Battery case outer wall 3a, 3b, 3c, 3d, 3e Partition wall 4a, 4b, 4c, 4d, 4e, 4f Cell room 5 Heat dissipation promotion member 6 Recess

Claims (6)

[Claims] 1. A monoblock battery having a monoblock-type battery case having a plurality of cell chambers arranged adjacently in a row and having different surface areas of battery case outer walls, wherein the battery case outer wall has a small surface area. A monoblock battery, wherein a heat-dissipating member having better heat conductivity than the material of the battery case is provided on the outer wall of the battery case of the cell chamber so as to be able to transfer heat. 2. The monoblock battery according to claim 1, wherein the heat dissipation promoting member is provided on an outer surface of an outer wall of the battery case. 3. The heat radiation promoting member is disposed in a concave portion on the outer surface of the battery case outer wall.
The monoblock battery according to 1. 4. The concave portion is formed so that the depth becomes deeper in the order from the cell chamber at a position where heat radiation is easy to dissipate in the direction in which the cell chambers are arranged, to the cell chamber at a position where heat radiation is difficult.
4. The monoblock battery according to claim 3, wherein the heat dissipation promoting member having a thickness corresponding to the depth is disposed in the recess. 5. 5. The monoblock battery according to claim 1, wherein said heat dissipation promoting member is formed of a metal plate. 6. The monoblock battery according to claim 1, wherein the heat dissipation promoting member is formed as a sprayed layer by spraying a molten metal.