JP2003132856A - Accumulator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correctly position a battery jar case and a cover enclosing single cells and prevent heat generation from a terminal periphery. SOLUTION: On a cover 20 for sealing each single cell installed on an upper portion of a cooling box 10 and enclosed in the cooling box 10, a cell terminal 21 connected to a positive pole side terminal and a negative side pole terminal of each single cell enclosed in the cooling box 10 is insert-formed. In the bath case, a concave portion is formed, and on the cover 20, a convex portion fitting to the concave portion is formed. The cell terminal 21 inserted on the cover 20 can be cooled by a cooling material passing through a cooling material passway of the cooling box 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a storage battery, and more particularly to a storage battery configured in the form of an assembled battery so that a required electric power capacity can be obtained by connecting a plurality of cells.

[0002]

2. Description of the Related Art A large-capacity storage battery constructed by connecting a plurality of single cells such as nickel-cadmium storage battery, nickel-hydrogen storage battery, hydrogen storage battery, etc.
It is used in electric vehicles. In such a large-capacity storage battery, a plurality of rectangular cells are usually arranged and bound so as to be in close contact with each other. In each unit cell, a plurality of positive electrode plates and a plurality of negative electrode plates are alternately stacked and housed via a separator containing an electrolytic solution.

In such a unit cell, when the ambient temperature is high or when it is discharged by a large current, the electrode plates and the like housed in each unit cell are not sufficiently dissipated, the battery temperature rises and the battery life increases. May decrease. In order to solve such a problem, the following configuration has been proposed for cooling a large-capacity storage battery configured by connecting a plurality of unit cells.

In Japanese Unexamined Patent Publication No. 6-215804, side plates are provided along the wall surfaces on both sides along the longitudinal direction of a rectangular parallelepiped monoblock storage battery, and a refrigerant is provided between each wall surface and each side plate. A configuration is disclosed in which a passage (fluid circulation chamber) is formed and a refrigerant is supplied to this refrigerant passage.

Japanese Patent Laid-Open No. 2000-251950 discloses that
In an assembled battery formed by arranging and connecting a plurality of unit cells configured in the shape of a rectangular parallelepiped so that their side surfaces in the longitudinal direction face each other, a refrigerant passage is formed between each unit cell. At the same time, a configuration is disclosed in which a coolant passage that communicates with each coolant passage is formed along the side surface of each unit cell in the short side direction, and the coolant flows through each coolant passage.

[0006]

In each of the above-mentioned conventional storage batteries, a liquid cooling medium such as water is used as a cooling medium for cooling each unit cell connected at a predetermined position. In order to prevent the liquid cooling medium from entering the power generation element composed of the positive electrode plate, the negative electrode plate, and the separator, the cooling medium passage and the power generation element are completely cut off from each other. .

For example, in the above-mentioned Japanese Patent Laid-Open No. 6-215804, power is generated by a plastic material case which is composed of a tank having an open upper part for accommodating a power generating element such as an electrode plate and a lid attached to the upper part of this layer. The element is sealed off from the coolant passage.

Further, the above-mentioned Japanese Patent Laid-Open No. 2000-251950.
In the publication, a unitary lid is joined to the upper part of a collective sealed secondary battery in which a plurality of cells are joined together in series to form a single unit, so that the power generation element in the unit cell is connected to a refrigerant passage. It is sealed in a state of being cut off from.

[0009] However, in these publications, when the lid is attached to the tank for accommodating the unit cells, the positioning means for attaching the lid to the proper position is not provided, so that the lid is correctly positioned in the tank. It's not easy.
If the lid is not properly positioned with respect to the bath,
If the cooling medium does not improve the effect of cooling the unit cell, and if the unit is used in a state where vibration or the like may occur, the lid may easily come off the tank and the cooling medium may enter the power generation element.

The portion of the storage battery that generates heat during discharge is not limited to the electrode plate portion. In particular, if the terminal portion connected to the outside is excessively heated, the battery case around the terminal may be damaged due to heat generation.
However, in the above publication, although the electrode plate portion is mainly cooled by the cooling medium, it does not have a structure for preventing heat generation at the terminal portion.

The present invention has been made to solve the above problems, and it is a first object of the present invention to provide a storage battery in which a battery case and a lid for accommodating a single battery can be properly positioned and arranged. The purpose of. A second object is to provide a storage battery capable of preventing heat generation not only in the electrode plate portion but also in the vicinity of the terminal.

[0012]

In order to solve the above-mentioned problems, the storage battery of the present invention is provided with a plurality of single cells having a power generation element in which a plurality of positive electrode plates and a plurality of negative electrode plates are alternately laminated with a separator interposed therebetween. Batteries and battery cells are electrically connected to each other, a battery case that integrally fixes the upper part of each battery cell, and each battery cell and battery case are housed, and each side surface of each battery battery A cooling box having a cooling medium passage formed between the cooling box and a lid that is attached to an upper portion of the cooling box and seals each of the cells and the battery case housed in the cooling box. The battery case is provided with battery terminal portions connected to the positive electrode side and the negative electrode side terminal portions of each of the electrically connected cells, and the battery case has a recessed notch formed therein. The protrusion is formed on the concave portion to engage with the concave notch. The one in which the features.

In the above storage battery of the present invention, it is preferable that the battery case and the lid are integrally joined by being welded to each other.

In the above storage battery of the present invention, it is preferable that the battery case and the lid are integrally bonded by adhering to each other.

In the above storage battery of the present invention, it is preferable that the battery terminal portion insert-formed in the lid is cooled by the cooling medium in the cooling box.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a perspective view of a storage battery 100 according to an embodiment seen from an oblique front direction, and FIG.
It is the perspective view which looked at this storage battery 100 from the back surface direction opposite to the direction of FIG. The storage battery 100 cools a plurality of unit cells that form an assembled battery with high cooling efficiency.
The storage battery 100 has a cooling box 10 for cooling the plurality of single cells housed therein, and a lid 20 for sealing the cooling box 10. The cooling box 10 and the lid 20 are made of synthetic resin.

FIG. 3 is a perspective view of the storage battery 100 with the lid 20 removed from the cooling box 10.
In this cooling box 10, six unit cells 30 arranged in 3 rows × 2 columns and electrically connected in series are accommodated in a frame-shaped battery case case 40 in an integrated state.
The battery case 40 is made of synthetic resin. At each end of the battery case 40, a cylindrical inlet orifice 41 and outlet orifice 42 for injecting and discharging cooling water, which is a cooling medium for cooling the unit cells 30, are provided.
Are provided so as to project upward, respectively.

FIG. 4 is a perspective view showing a state in which the unit cells 30 arranged in 3 rows × 2 columns are integrally connected to the battery case 40. FIG. 5 is a perspective view showing a state in which the unit cells 30 are arranged in 3 rows × 2 columns with the battery case 40 removed.

As shown in FIG. 5, each unit cell 30 has a battery case 31 containing a power generating element composed of a positive electrode plate, a negative electrode plate, and a separator, which will be described later. Each battery case 31
Is a thin rectangular parallelepiped having a widthwise dimension larger than the thickness and having a thicknesswise side surface 32 and a widthwise side surface 33 wider than the thicknesswise side surface 32. Is formed in. Each battery case 31 is made of synthetic resin. Inside each battery case 31, a plurality of positive electrode plates and a plurality of negative electrode plates are housed, respectively, with power generation elements alternately stacked via grid-shaped separators holding dilute sulfuric acid or the like. Each of the electrode plates forming the positive electrode plate and the negative electrode plate is in parallel with the lateral side surface 33. A plurality of columnar protrusions 34 are provided on the widthwise side surface 33 of each battery case 31 so as to be uniformly distributed at regular intervals.

The battery case 40, as shown in FIG.
A rectangular frame shape is formed by the pair of width direction side surface holding portions 43 and the pair of thickness direction side surface holding portions 44 so that the upper portions of the unit cells 30 arranged in rows × 2 columns are constrained and integrated. Has been done. Battery case 40 formed in a rectangular frame shape
The inside of is divided into three equal parts in the longitudinal direction by the pair of thickness direction side surface holding parts 44, and is equally divided into two parts in the width direction by one width direction side surface holding part 43, so that a hollow part of 3 rows and 2 columns is formed. Has been formed. And each unit cell 3 in each hollow part
The tops of 0 are fitted together. Battery case 40
Are joined to the battery case 31 of each unit cell 30 by welding or adhesion.

Referring to FIGS. 4 and 5, the three unit cells 30 forming each column are arranged so that the side surfaces 32 in the thickness direction thereof face each other, and the two unit cells forming each row 2 are arranged.
The unit cells 30 are arranged such that the width-direction side surfaces 33 thereof face each other.

All the positive electrodes contained in the battery case 31 are collectively connected to the upper portions of the other four unit cells 30 except the pair of unit cells 30 forming one row at one end. There are provided a positive electrode plate side strap 35 and a negative electrode plate side strap 35 that are collectively connected to all the negative electrode plates housed in the battery case 31. Each strap 35 has an L-shaped cross section. In the unit cells 30 adjacent to each other in the column direction in these four unit cells 30, the strap 35 on the positive electrode plate side of one unit cell 30 and the strap 35 on the negative side of the other unit cell 30 are both unit cells. They are connected in series by being electrically connected through the through holes provided in the thickness direction side surface holding portions 44 between the 30.

The pair of unit cells 30 forming one row at the other end of the other four unit cells 30 include a strap 35 on the positive side of one unit cell 30 and a negative electrode of the other unit cell 30. The strap 35 on the side is electrically connected via a through hole provided in the widthwise side surface holding portion 43 between the unit cells to be connected in series.

One of the pair of unit cells 30 forming one row at one end has a strap 35 on the positive electrode side connected to all the positive electrode plates housed in the battery case 31 at once. A negative electrode side terminal portion 36 connected collectively to all the negative electrode plates housed in the battery case 31 is provided in the upper portion, and the other of the pair of unit cells 30 forming one row is A strap 35 on the negative electrode side that is collectively connected to all the negative electrode plates housed in the battery case 31 and a strap 35 on the positive electrode side that is collectively connected to all the positive electrode plates housed in the battery container 31. The terminal part 36 is provided on the upper part.

The positive electrode side strap 35 of one unit cell 30 and the negative electrode side strap 35 of the unit cell 30 adjacent to the unit cell 30 in the column direction are the thickness direction between both unit cells. They are connected in series by being electrically connected through a through hole provided in the side surface holding portion 44, and the strap 35 on the negative electrode side of the other unit cell 30 and the column direction with respect to this unit cell 30. The positive electrode side strap 35 of the unit cell 30 adjacent to the unit cell 30 is electrically connected via a through hole provided in the thickness direction side surface holding section 44 between the unit cells to be connected in series. . in this way,
Six unit cells 30 arranged in 3 rows × 2 columns are connected in series in a U-shape.

Inlet orifice 41 and outlet orifice 4
2 are provided outside the central portion of the thickness direction side surface holding portion 44 located at each end of the battery case 40.

FIG. 6 is a perspective view of the cooling box 10. The cooling box 10 is a hollow, substantially rectangular parallelepiped whose upper surface is open. On the open upper surface of the cooling box 10, 2 rows × 3 integrated with the battery case 40 are formed.
The cells 30 in a row are inserted from above. An appropriate space is formed between the inserted unit cell 30 and the inner wall surface 11 of the cooling box 10. On the inner wall surface 11 of the cooling box 10, a plurality of ribs 12 extending in the vertical direction are formed in parallel with each other at appropriate intervals. Each single battery 30 housed in the cooling box 10
The protrusions 34 formed on the widthwise side surfaces 33 of the battery case 31 are butted against the respective ribs 12 provided on the inner wall surface 11 of the cooling box 10 along the up-down direction and are ultrasonically applied to the respective ribs 12. It is designed to be welded. Therefore, a space along the vertical direction is formed between each rib 12 on the inner wall surface 11 of the cooling box 10 and the protrusion 34 of each unit cell 30.

FIG. 7 is a perspective view of the lid body 20 seen from the same direction as FIG. At one end of the lid 20, two battery terminals 21 for connecting the cells 30 in 3 rows × 2 columns connected in series to the outside of the storage battery 100 are provided so as to project upward. The cooling box 10 is electrically connected to the terminals 36 of the pair of single cells 30 arranged at one end of the cooling box 10. Further, at each end, an inlet orifice 4 protruding from the battery case 40 is provided.
Orifice mounting holes 22 and 23 are formed so that the No. 1 and the outlet orifices 42 respectively penetrate therethrough.

When the battery case 40 in which the six unit cells 30 are integrated is inserted from the upper part of the cooling box 10, the lid 20 is mounted on the battery case 40 in the cooling box 10. The lid 20 is a battery case 40 inside the cooling box 10.
When mounted on top, as shown in FIG. 2, the inlet orifice 41 and the outlet orifice 42 penetrate through the orifice mounting holes 22 and 23 formed in the lid 20, respectively. The lid 20 is joined to the battery case 40 and the cooling box 10 by welding or adhesion.

FIG. 8 is a perspective view showing a vertical cross section of the cooling box 10 in which the battery case 40 in which the six unit cells 30 are integrated is inserted and the lid 20 is attached, and FIG. 9 is a longitudinal section thereof. It is a side view. FIG. 10 is a perspective view showing a vertical section of the end of the inlet orifice 41, and FIG. 11 is a vertical section thereof. FIG. 13 is an enlarged perspective view showing a vertical cross section of the inlet orifice 41 and its peripheral portion. 12
FIG. 3 is a perspective view showing a vertical cross section and a horizontal cross section of an end portion including the inlet orifice 41.

A hollow injection header 13 is provided on the outer side of the upper portion of one end of the cooling box 10 in the longitudinal direction over the entire thickness direction. Injection header 13
Has an open top surface. When the battery case 40 is inserted into the cooling box 10, the inlet orifice 41 of the battery case 40 is located on the central portion of the injection header 13. A cooling medium is supplied into the injection header 13 from an inlet orifice 41. The injection header 13 includes the cells 30 housed in the cooling box 10 and the inner wall surface 11 of the cooling box 10.
It communicates with the space between.

A hollow discharge header 14 is provided over the entire thickness direction outside the upper part of the other end of the cooling box 10 in the longitudinal direction. Discharge header 14
Has an open top surface. When the battery case 40 is inserted into the cooling box 10, the outlet orifice 42 of the battery case 40 is located on the central portion of the discharge header 14. The discharge header 14 also communicates with the space between the unit cells 30 housed in the cooling box 10 and the inner wall surface 11 of the cooling box 10, and the cooling medium that has cooled the unit cells 30 is stored in the discharge header 14. It is supplied from the cooling box 10 and discharged from the outlet orifice 42.

Next, the recess 4 provided in the battery case 40
0a and the convex portion 20a provided on the lid 20 will be described. FIG. 14 is a perspective view showing battery case 40 accommodated in cooling box 10 according to the embodiment.
FIG. 15 is a perspective view for explaining a recess formed in the battery case 40, and FIG. 16 is a perspective view of a main part thereof. FIG. 17 is a front view thereof. Of the four thickness direction side surface holding portions 44 of the battery case 40, the inlet orifice 4
1. The thickness direction side surface holding portion 44 provided at the position closest to 1
Two recesses 45 having a trapezoidal shape are formed in the. The two recesses 45 are formed in the thickness direction side surface holding portion 4
It is formed at a position facing the lid 20 of No. 4 and corresponding to each of the two unit cells 30 arranged at the inlet orifice 41 side.

FIG. 18 shows a storage battery 100 according to the embodiment.
It is a perspective view for explaining the convex part formed in the cover body 20 of FIG. 19, and FIG. 19 is a front view thereof. The lid 20 is provided with the side surface holding portion 44 in the thickness direction of the battery case 40.
Two convex portions 24 that engage with the respective concave portions 45 are provided. The side surface of the convex portion 24 has a trapezoidal shape, and the long side of the trapezoid is in contact with the lid 20 side.

Cooling box 1 containing battery case 40
When the lid body 20 is attached to 0, the two protrusions 24 formed on the lid body 20 are formed on the side surface holding portion 44 in the thickness direction.
The two recesses 45 are engaged with each other. The inlet orifice 41 and the outlet orifice 42 provided in the battery case 40 penetrate through the orifice mounting holes 22 and 23 provided in the lid 20, respectively.

As described above, according to the present embodiment, the two convex portions 24 formed on the lid 20 are respectively engaged with the two concave portions 45 formed on the side surface holding portion in the thickness direction of the battery case 40. Therefore, the cooling box 10 in which the battery case 40 is housed and the lid 20 can be correctly positioned. Therefore, the cooling box 10 accommodating the battery case 40 can be reliably sealed by the lid 20.

In addition, the recess 4 of the battery case 40 is
5, the convex portion 24 of the lid 20 is fitted and engaged to form a sealed state, and then the battery case 40 and the lid 20 are welded or bonded to each other so as to be integrally joined. Good. By welding or adhering each other in this manner, the sealing of each unit cell in the cooling box becomes more reliable.

The cooling box 10 and the lid 20 are sealed by simply inserting the convex portion 24 formed on the lid 20 into the concave portion 45 of the battery case 40, which is a simple structure.
Since no extra structure is interposed, it is possible to improve the cooling efficiency of the unit cells 30 housed in the cooling box 10.

Further, with the above structure, the lid body 20 can be correctly positioned and reliably sealed in the cooling box 10, so that the lid body 20 can be used even when it is used in a strong vibration such as for an automobile. It is difficult to come off from the cooling box 10, and it is possible to prevent the refrigerant from entering the power generation element through the refrigerant passage.

FIG. 20 is a view showing a vertical cross section along the cross section of the battery terminal 21 of the cooling box 10 in which the battery case 40 in which the six unit cells 30 are integrated and the lid 20 are attached. FIG. 21 shows one of the two battery terminals 21.
2 is a perspective view showing a longitudinal section of an end portion provided with a book, and FIG.
2 is a vertical sectional view thereof.

When the lid 20 is mounted on the cooling box 10, the two battery terminals 21 are located above the injection header 13. Each battery terminal 21 has a bolt shape and is integrally formed with the lid body 20 by insert molding. When the lid 20 is mounted on the cooling box 10, the two battery terminals 21 are connected to the cells 30 arranged in 3 rows × 2 columns.
One of the ends is electrically connected by a terminal member 36 provided on each of the pair of unit cells 30 forming one row and a connection member provided on the lid 20. As described above, the two battery terminals 21 connect the unit cells 100 of 3 rows × 2 columns connected in series to the outside.

FIG. 23 shows each unit cell 30 according to the embodiment.
It is the perspective view which looked at battery case 31 from the bottom. Figure 24
Cut the cooling box of Fig. 6 along the vertical plane of AOA ',
FIG. 2 is a perspective view when viewed from the top surface direction, showing a bottom surface and an inner wall surface formed inside the cooling box 10.
Referring to FIG. 23, a plurality of recesses 38 are formed on the bottom surface 37 of each battery case 31. The plurality of recesses 38 have a circular shape, one at each of the four corners of the bottom surface 37, one at each of the centers of the two long sides and two short sides, and further,
One concave portion 38 is arranged in the central portion of the bottom surface 37, and a total of nine concave portions 38 are formed in a matrix of 3 rows × 3 columns. One concave portion arranged in the center is formed to have a larger diameter than the other concave portions. Referring to FIG. 24, the bottom surface 15 formed inside the cooling box 10 has a bottom surface of each battery case 31. Nine convex portions 16 that are fitted into and engaged with the respective nine concave portions 38 are provided at positions corresponding to the nine concave portions 38 formed in 37. The battery case 31 and the cooling box 10 are positioned relative to each other by the concave portion 38 and the convex portion 16, and the unit cells housed in the cooling box 10 are
It will be in a sealed state.

FIG. 25 shows a storage battery 100 according to the embodiment.
3 is a rear view schematically showing the cooling medium passage of FIG. As described above, the cooling box 10 accommodates the battery cells 31 of the six single cells 30 arranged in 3 rows × 2 columns.

As shown in FIG. 25, between the widthwise side surfaces 33 on the outer sides of the individual cells 30 facing the inner wall surfaces 11 of the cooling box 10 and the inner wall surfaces 11 of the cooling box 10, respectively. The cooling medium passages 51 on both sides are formed by the formed space. The cooling medium passage 51 includes a width direction side surface 33, an inner wall surface 11, a protrusion 34 (FIG. 4) formed on the width direction side surface 33, and the inner wall surface 1.
It is surrounded by the ribs 12 (FIG. 6) formed on the base plate 1. One cooling medium passage 52 is formed between the widthwise side surfaces 33 facing each other inside each battery case 31. The cooling medium passage 52 is surrounded by the widthwise side surface 33 and the protrusion 34 (FIG. 4) formed on the widthwise side surface 33. Four cooling medium passages 53 are formed between the thickness direction side surfaces 32 facing each other, and each cooling medium passage 53 communicates with the cooling medium passages 51 and 52, respectively. Each of the cooling medium passages 51 and 52 communicates with the injection header 13 (FIG. 8) and the discharge header 14 (FIG. 8), respectively.

Such cooling medium passages 51, 52 and 5
In the storage battery having No. 3, when the cooling medium is injected from the inlet orifice 41, a part of the injected cooling medium flows through the injection header 13 in the central cooling medium passage 52 along the arrow 55, and the cooling medium is discharged. The widthwise side surface forming the passage 52 is forcibly cooled. The other part of the cooling medium flows through the injection header 13 (FIG. 8) through the cooling medium passages 51 on both sides along the arrows 54 to forcibly cool the widthwise side faces 33 forming the cooling medium passages 51, respectively. . A part of the cooling medium flowing through the central cooling medium passage 52 is the cooling medium passage 5
4 cooling medium passages 5 branched from 2 along the arrow 56
3 to form tributaries. The cooling medium flowing through the cooling medium passage 53 merges with the cooling medium flowing through the cooling medium passages 51 on both sides. The cooling medium flowing through the cooling medium passages 51 and 52 is discharged from the outlet orifice 42 through the discharge header 14 (FIG. 8).

The cooling medium flowing through the cooling medium passages 51 and 52 forms a main flow which is a main flow, and the cooling medium which branches from the cooling medium passage 52 and flows through the cooling medium passage 53 forms a subsidiary flow which is a subsidiary flow. . In this way, the cooling medium passages 51 and 52 are formed so that the main flow of the cooling body flows along the width direction side surface 33 in the direction orthogonal to the thickness direction side surface 32.

Two battery terminals 21 are arranged above the injection header 13 as shown in FIG. These two battery terminals 21 are connected to the lower injection header 13
It is cooled by heat exchange with the cooling medium passing through. Thus, the injection header 1 formed below the battery terminal 21.
3 and then through the cooling medium passage to the discharge header 1
Since it is configured to be discharged to the outside from 4, even if a large current flows to the battery terminal at the time of discharging the storage battery, the battery terminal 21 can be effectively cooled, and the battery terminal 21 generates excessive heat,
It is possible to prevent damage such as melting of the portion around the battery terminals due to heat generation.

[0048]

According to the storage battery of the present invention, a concave notch is formed in the battery case, and a convex portion that engages with the concave notch is formed in the lid. Therefore, the lid can be correctly positioned in the cooling box by simply inserting and engaging the convex portion of the lid in the notch of the battery case, and easily sealing the individual cells housed in the cooling box. Can be in a state.

[Brief description of drawings]

FIG. 1 is a perspective view showing an external appearance of a storage battery according to an embodiment when viewed from an oblique front direction.

FIG. 2 is a perspective view showing the external appearance of the storage battery according to the embodiment when viewed from an oblique side surface direction.

FIG. 3 is a perspective view showing the external appearance of the storage battery according to the embodiment with the lid removed.

FIG. 4 is a perspective view showing the appearance of a plurality of unit cells that are integrated by a battery case of the storage battery according to the embodiment.

FIG. 5 is a perspective view showing the appearance of a plurality of unit cells connected to each other of the storage battery according to the embodiment.

FIG. 6 is a perspective view showing the external appearance of the cooling box of the storage battery according to the embodiment.

FIG. 7 is an external view of a lid of the storage battery according to the embodiment.

FIG. 8 is a perspective view showing a vertical cross section of the cooling box in which the battery case according to the embodiment is inserted and the lid is attached.

FIG. 9 is a vertical cross-sectional view of the cooling box in which the battery case according to the embodiment is inserted and the lid is attached.

FIG. 10 is a perspective view showing a vertical cross section of an end portion including an outlet orifice of a storage battery according to an embodiment.

FIG. 11 is a vertical cross-sectional view of an end portion including the outlet orifice of the storage battery according to the embodiment.

FIG. 12 is a perspective view showing an enlarged vertical cross section of the outlet orifice of the storage battery according to the embodiment and its peripheral portion.

FIG. 13 is a perspective view showing a vertical cross section and a horizontal cross section of an end portion including an outlet orifice of a storage battery according to an embodiment.

FIG. 14 is a perspective view showing a battery case case housed in a cooling box according to the embodiment.

FIG. 15 is a perspective view for explaining a recess formed in the battery case of the storage battery according to the embodiment.

FIG. 16 is an enlarged perspective view of an essential part of the battery case of the storage battery according to the embodiment.

FIG. 17 is a front view for explaining a recess formed in the battery case of the storage battery according to the embodiment.

FIG. 18 is a perspective view for explaining a convex portion formed on the lid of the storage battery according to the embodiment.

FIG. 19 is a front view for explaining a convex portion formed on the lid of the storage battery according to the embodiment.

FIG. 20 is a diagram showing a cross section along the cross section of the battery terminal of the cooling box of the storage battery according to the embodiment.

FIG. 21 is a perspective view showing a vertical cross section of an end portion provided with a battery terminal of the storage battery according to the embodiment.

FIG. 22 is a vertical cross-sectional view of an end portion provided with a battery terminal of the storage battery according to the embodiment.

FIG. 23 is a perspective view of the unit cell according to the embodiment as seen from the bottom surface direction.

FIG. 24 is a perspective view showing a bottom surface and an inner wall surface formed inside the cooling box of the storage battery according to the embodiment.

FIG. 25 is a plan view schematically showing the cooling medium passage of the storage battery according to the embodiment.

[Explanation of symbols]

10 cooling box 11 inner wall surface 15 Bottom 16 convex 20 lid 30 cells 31 Battery case 32 Side in thickness direction 33 Width side 34 Projection 37 Bottom 38 recess 40 battery case 51, 52, 53 Cooling medium passage 100 storage battery

Continued front page    (72) Inventor Kenji Kimura             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. F term (reference) 5H011 AA02 AA09 BB03 BB05 CC02                       DD13                 5H031 AA09 EE04 KK03 MM22

Claims (4)

[Claims] 1. A plurality of unit cells each having a power generating element in which a plurality of positive electrode plates and a plurality of negative electrode plates are alternately stacked with a separator interposed therebetween, and each unit cell is electrically connected to each other. A battery case that integrally fixes the upper part of the unit cell, a cooling box that accommodates each unit cell and the battery case, and forms a cooling medium passage between each side surface of each unit cell, and an upper part of the cooling box And a lid for sealing the individual cells and the battery case that are attached to the cooling box, and the lid includes a positive electrode side and a negative electrode side of each electrically connected single cell. A battery terminal portion connected to the terminal portion is provided, a concave cutout portion is formed in the battery case, and a convex portion that engages with the concave cutout portion is formed in the lid body. A storage battery characterized by being. 2. The storage battery according to claim 1, wherein the battery case and the lid are integrally joined by being welded to each other. 3. The storage battery according to claim 1, wherein the battery case and the lid are integrally bonded by being bonded to each other. 4. The storage battery according to claim 1, wherein the battery terminal portion insert-formed on the lid is cooled by a cooling medium in a cooling box.