JPH10233201A - Square type storage battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve charging and discharging cycle life by fitting, on respective electrodes, a square electrode body, the first collector tab attached on the top of the electrode body, and the second collector tab attached on the bottom of the electrode body. SOLUTION: A negative electrode 14 consists of a negative electrode body 2 and two collector tabs 1. The two collector tabs 1 are attached diagonally at the top and bottom of the negative electrode body 2, that is, the tab 1 is attached on the upper left and lower right sides of the body 2 respectively. A positive electrode consists of two collector tabs in the same way as the negative electrode. A storage battery to which two collector tabs are attached diagonally on the electrode has the highest operating voltage. This is because polarization becomes larger when the collector tab is attached on the upper left side of the electrode, however, polarization is minimum as the whole electrode because another collector tab is attached on the lower right side. Resistance decreases, heat generation is suppressed during charging, and the negative electrode is suppressed from being corroded, thus it is possible to improve charging efficiency at the negative electrode.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a prismatic storage battery, and more particularly to a prismatic storage battery having improved discharge capacity and charge / discharge cycle life.

[0002]

2. Description of the Related Art In a conventional prismatic storage battery in which electrode plates are stacked, each electrode plate is configured by attaching one current collecting tab to an electrode body. In addition, this collection tab
It was common to attach it to the upper corner of a square electrode body.

[0003] However, the tab is located at such a position.
When only one electrode is attached, the polarization in one electrode increases, and the resistance per electrode increases. As a result, since the temperature of the battery becomes high during charging, there is a problem that the charging efficiency is reduced and the battery capacity is reduced. In addition, in the negative electrode, corrosion due to heat generation during charging causes
There is also a problem that the charge / discharge cycle life is reduced.

[0004] On the other hand, in a rectangular storage battery, the positive electrode terminal and the negative electrode terminal are generally mounted so as to protrude in a cylindrical shape above the battery case. Therefore, when a battery pack is manufactured by assembling a plurality of prismatic storage batteries configured as described above, it is necessary to connect the terminals with metal fittings such as bolts as disclosed in, for example, JP-A-8-88021. was there. However, since this metal fitting has its own resistance, there is a problem that power loss occurs, charging efficiency is reduced, and battery capacity is reduced.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, to increase the operating voltage and the discharge capacity,
An object of the present invention is to provide a storage battery having an improved charge / discharge cycle life and an assembled battery using the same.

[0006]

A prismatic storage battery according to the present invention is a prismatic storage battery formed by laminating a plurality of electrode plates, each of which has a rectangular electrode body and an upper portion of the electrode body. It is characterized by comprising a first current collecting tab attached and a second current collecting tab attached to the lower part of the electrode body.

According to the present invention, each electrode plate has two current collecting tabs. Therefore, the polarization of the electrodes is reduced, and the resistance per electrode is reduced. As a result, heat generation during charging is reduced, charging efficiency is improved at the positive electrode, and discharge capacity is increased. Also, in the negative electrode, corrosion due to heat generation is suppressed, so that the charge / discharge cycle life is improved. Further, since the voltage increases during discharge due to the decrease in polarization, output characteristics are also improved.

[0008] Preferably, the first and second current collecting tabs are mounted on a diagonal line of a square electrode body.

The reason for this is that by mounting the current collecting tab in such a position, the polarization in one electrode can be minimized.

[0010] Preferably, the width of the first and second current collecting tabs is 20 to 48% of the width of the electrode body. If it is less than 20%, it is difficult to sufficiently reduce the polarization of the electrode. On the other hand, if it is more than 48%, when the positive electrode and the negative electrode are laminated to form a storage battery, there is a possibility that the positive electrode and the negative electrode come into contact and short-circuit. Because there is.

The battery pack according to the present invention is a battery pack comprising a plurality of prismatic storage batteries assembled, wherein the first prismatic storage battery is mounted on a first surface on a first diagonal line. Electrode terminals of the first polarity and two electrode terminals of the second polarity mounted on the second surface facing the first surface on a second diagonal line in a direction different from the first diagonal line Wherein the second prismatic storage battery comprises two first polarity electrode terminals and two second polarity electrodes which are mounted in an enantiomer relationship with the first prismatic storage battery. And the first rectangular storage battery and the second rectangular storage battery are connected in series by contacting electrode terminals having different polarities.

According to the present invention, two positive terminals and two negative terminals are attached to the first and second storage batteries so as to be mirror images of each other, and the electrode terminals having different polarities are brought into contact with each other. Thus, the storage batteries are connected in series. Therefore, unlike the related art, there is no need to use a separate bracket for connecting the terminals, and the problem of power loss due to the use of the bracket is solved.

Further, in the present invention, the first storage battery and the second storage battery are connected by contacting electrode terminals having different polarities. Therefore, unlike the case of connection using a conventional metal fitting, it is not necessary to attach a protruding cylindrical large electrode terminal, and the electrode terminal can be made thin and small in volume. As a result, the loss of volume due to attaching terminals in each storage battery is reduced, and the discharge capacity per storage battery is increased. Therefore, the discharge capacity of the entire battery pack is also increased, and the battery pack having an excellent volume energy density is obtained.

It is preferable to use the storage battery according to the present invention described above for the battery pack according to the present invention. Such a combination further increases the discharge capacity.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment of Storage Battery A first embodiment of a rectangular storage battery according to the present invention will be described below with reference to FIGS.

FIG. 1 is a plan view showing a negative electrode plate used in the storage battery of the first embodiment. Referring to FIG. 1, this negative electrode plate 14 has a width of 100 mm, a height of 110 mm, and a thickness of 0.1 mm.
A negative electrode plate body 2 of 5 mm, a width of 48 mm, a height of 10 mm,
And two current collecting tabs 1 having a thickness of 0.1 mm. The two current collecting tabs 1 are mounted diagonally on the upper and lower portions of the negative electrode plate main body 2. That is, in FIG. 1, the current collecting tabs 1 are attached to the upper left and lower right of the negative electrode plate main body 2, respectively.

FIG. 2 is a plan view showing a positive electrode plate used in the storage battery of the first embodiment. Referring to FIG. 2, this positive electrode plate 15 has a width of 100 mm, a height of 110 mm, and a thickness of 0.1 mm.
It is composed of a 5 mm positive electrode plate main body 3 having the same size as the negative electrode plate main body shown in FIG. 1, and two current collecting tabs 1 having a width of 48 mm, a height of 10 mm, and a thickness of 0.1 mm. The two current collecting tabs 1 are mounted on the upper and lower portions of the positive electrode plate main body 3 and on diagonal lines in directions different from those of the negative electrode plate. That is, in FIG. 2, the current collecting tabs 1 are attached to the upper right and lower left of the positive electrode plate main body 3, respectively.

The negative electrode plate 14 and the positive electrode plate 15 configured as described above are alternately laminated as shown in FIG. 3 to obtain an electrode plate laminate 16 as shown in FIG. The electrode plate laminate 16 is housed in a battery case to constitute a storage battery.

FIG. 5 is a perspective view showing the storage battery of the first embodiment. Referring to FIG. 5, storage battery 100 has width 1
An electrode plate laminate 16 shown in FIG. 4 is housed in a battery case 17 having a thickness of 10 mm and a thickness of 37 mm. Battery case 17
A cylindrical negative electrode terminal 18 and a positive electrode terminal 19 are attached to the upper and lower portions of the battery so as to protrude, and have a total height of 170 mm. These electrode terminals 18, 19
The position where is attached corresponds to the polarity of each current collecting tab attached to each electrode plate in the electrode plate laminate 16.
That is, in FIG. 4, the current collecting tabs of the negative electrode plate are located at the upper left and lower right, and the current collecting tabs of the positive electrode plate are located at the upper right and lower left.
The positive electrode terminal 19 is attached to the upper right and lower left of the storage battery 100, respectively.

In the storage battery 100 configured as described above, since the current collecting tabs are mounted diagonally on each electrode plate, the polarization is minimized.

Next, the structure of a prismatic storage battery according to a second embodiment of the present invention will be described with reference to FIGS.

FIG. 6 is a plan view showing a negative electrode plate used in the storage battery of the second embodiment. Referring to FIG. 6, negative electrode plate 24 includes negative electrode plate main body 2 and two current collecting tabs 1, and two current collecting tabs 1 are on the same side of upper and lower portions of negative electrode plate main body 2. Mounted on That is, in FIG.
The current collecting tabs 1 are attached to the upper left and lower left of the negative electrode plate main body 2, respectively. The other configuration is exactly the same as that of the negative electrode plate 14 used in the first embodiment shown in FIG.

FIG. 7 is a plan view showing a positive electrode plate used in the storage battery of the second embodiment. Referring to FIG. 7, positive electrode plate 25 includes positive electrode plate main body 3 and two current collecting tabs 1, and two current collecting tabs 1 are located above and below positive electrode plate main body 3. , Are mounted on a side different from that of the negative electrode plate. That is, in FIG. 7, the current collecting tab 1 is
It is attached to the upper right and lower right of the camera, respectively. The other configuration is completely the same as that of the positive electrode plate 15 used in the second embodiment shown in FIG. 2, and the description thereof is omitted.

The negative electrode plate 24 and the positive electrode plate 25 configured as described above are alternately laminated as shown in FIG. 8 to obtain an electrode plate laminate 26 as shown in FIG. The electrode plate laminate 26 is housed in a battery case to form a storage battery.

FIG. 10 is a perspective view showing the structure of the storage battery of the second embodiment. Referring to FIG.
Reference numeral 0 denotes a configuration in which the electrode plate laminate 26 shown in FIG. A cylindrical negative electrode terminal 28 and a positive electrode terminal 29 are attached to the upper and lower parts of the battery case 27 so as to protrude.

Here, the storage battery 200 of the second embodiment
In FIG. 9, the current collecting tabs of the negative electrode plate are located at the upper left and lower left, and the current collecting tabs of the positive electrode plate are located at the upper right and lower right. At the upper left and lower left of the battery 200, the positive terminal 29 is connected to the storage battery 200.
It is attached to the upper right and lower right, respectively.

The other configuration is exactly the same as that of the storage battery 100 of the first embodiment shown in FIG. 5, and a description thereof will be omitted.

In the storage battery 200 configured as described above, since two current collecting tabs are attached to each electrode plate, compared with the case where only one current collecting tab is attached as in the conventional case, The polarization becomes smaller.

Embodiment Regarding Battery Assembly The structure of a battery assembly according to a first embodiment of the present invention will be described below with reference to FIGS.

FIG. 17 is a perspective view showing a first storage battery used in the battery pack of the first embodiment.

Referring to FIG. 17, this storage battery 400
Battery case 4 110mm wide, 150mm high, 37mm thick
7, an electrode plate laminate formed by laminating a plurality of electrode plates is housed. As the electrode plate laminate,
For example, the electrode plate laminate 16 or 26 shown in FIG. 4 or 9 is used.

The first surface of the container 47 has a size of 30 mm × 30
2 mm positive terminals 49 having a size of 1 mm and a thickness of 1 mm
Are mounted diagonally. Further, on the second surface facing the first surface, two negative electrodes 48 each having a size of 30 mm × 30 mm and a thickness of 1 mm are placed on a second diagonal line in a direction different from the first diagonal line. Installed.

FIG. 18 is a perspective view showing a second storage battery used for the battery pack of the first embodiment.

Referring to FIG. 18, this storage battery 500 includes:
The electrode plate laminate is housed in a battery case 57 so that the two negative electrode terminals 58 and the two positive electrode terminals 59 have a mirror image relationship with the first storage battery 400 shown in FIG. Mounted on Note that the other configuration is completely the same as that of the storage battery 400 shown in FIG. 17, and a description thereof will be omitted.

The first storage battery 400 and the second storage battery 500 configured as described above are alternately connected as shown in FIG. 19 to obtain an assembled battery.

FIG. 20 is a perspective view showing the structure of the battery pack of the first embodiment. Referring to FIG. 20, this assembled battery 60
0 indicates five first storage batteries 400 and five second storage batteries 50
0 is connected in series by alternately contacting electrode terminals having different polarities.

[0037]

【Example】

(Example 1) Preparation of negative electrode plate Mm (Misch metal), Ni, Co, Al, and Mn were mixed at a molar ratio of 1.0: 3.2: 1.0: 0.2: 0.6. The molten hydrogen storage alloy obtained by melting at 1500 ° C. in a high-frequency induction heating melting furnace was cooled and pulverized to obtain a hydrogen storage alloy powder.

10 parts by weight of the hydrogen storage alloy powder was mixed with PE
A paste was prepared by dispersing in 1 part by weight of an aqueous solution of 5% by weight of O (polyethylene oxide). Next, this paste was applied to a core made of a punching metal in which an iron plate was plated with Ni and rolled to produce a plate-shaped hydrogen storage alloy electrode.

This was used as a negative electrode plate main body, and two current collecting tabs were attached to produce a negative electrode plate having a structure shown in FIG.

Preparation of Positive Electrode Plate A positive electrode plate having a structure shown in FIG. 2 was prepared by using a known positive electrode plate body made of sintered nickel and having a theoretical capacity of 120 Ah, and attaching two current collecting tabs.

Production of Storage Battery Using the negative electrode plate and the positive electrode plate obtained as described above,
A storage battery having the structure shown in FIG. 5 was manufactured.

Example 2 Production of Negative Electrode Plate A negative electrode plate having a structure shown in FIG. 6 was produced by using the same hydrogen storage alloy electrode as in Example 1 as a negative electrode plate main body and attaching two current collecting tabs. .

Preparation of Positive Electrode Plate A sintered positive electrode having the structure shown in FIG. 7 was prepared by using the same sintered nickel electrode as in Example 1 as a positive electrode plate main body and attaching two current collecting tabs.

Production of Storage Battery Using the negative electrode plate and the positive electrode plate obtained as described above,
A storage battery having the structure shown in FIG. 10 was manufactured.

Comparative Example Preparation of Negative Electrode Plate A negative electrode plate having the structure shown in FIG. 11 was manufactured by using the same hydrogen storage alloy electrode as in Example 1 as the negative electrode plate main body and attaching only one current collecting tab.

The negative electrode plate 34 shown in FIG.
And one current collecting tab 1 attached to the upper left side thereof. The other configuration is exactly the same as that of the negative electrode plate 14 shown in FIG. 1, and the description is omitted.

Production of Positive Electrode Plate A sintered positive electrode having the structure shown in FIG. 12 was produced by using the same sintered nickel electrode as in Example 1 as a positive electrode plate main body and attaching only one current collecting tab.

The positive electrode plate 35 shown in FIG.
And one current collecting tab 1 attached to the upper right side thereof. The other configuration is completely the same as that of the positive electrode plate 15 shown in FIG. 2, and the description thereof is omitted.

Fabrication of Storage Battery The negative electrode plate 34 and the positive electrode plate 35 obtained as described above are alternately laminated as shown in FIG. 13 to obtain an electrode plate laminate 36 as shown in FIG. Was. Next, this electrode plate laminate 36 was housed in a battery case to produce a storage battery.

FIG. 15 is a perspective view showing the structure of the storage battery of the comparative example. Referring to FIG. 15, storage battery 300 includes:
The electrode plate laminate 36 shown in FIG. 14 is housed in a battery case 37. A cylindrical negative electrode terminal 38 and a cylindrical positive electrode terminal 39 are mounted on the upper portion of the battery case 37 so as to project one by one.

Here, in the storage battery 300 of Comparative Example 1, corresponding to the fact that the current collecting tab of the negative electrode plate exists at the upper left and the current collecting tab of the positive electrode plate exists at the upper right in FIG.
In FIG. 15, the negative electrode terminal 38 is attached to the upper left of the storage battery 300, and the positive electrode terminal 39 is attached to the upper right of the storage battery 300. Further, in this storage battery 300,
Since only one current collecting tab is attached to the electrode plate used, the height of the entire storage battery is 160 mm, and FIG.
The height is lower than the storage battery 100 of the first embodiment shown in FIG. The other configuration is the same as the first configuration shown in FIG.
Since it is completely the same as the storage battery 100 of the embodiment, the description is omitted.

(Evaluation) Measurement of Polarization Using the storage batteries of Examples 1, 2 and Comparative Examples obtained as described above, the battery was charged at 12 A (0.1 C) for 12 hours, and then charged at 120 A (0.1 C). Discharge at 1C),
The voltage at the time of 50% discharge was used as the index of polarization as the operating voltage of the battery.

Table 1 shows the results of the operating voltages of the batteries obtained as described above.

[0054]

[Table 1]

As is evident from Table 1, the storage batteries of Examples 1 and 2 in which two current collecting tabs were attached to the electrode plate according to the present invention were compared with those in which only one current collecting tab was attached. The operating voltage is higher than in the example storage battery.

In particular, the storage battery of Embodiment 1 in which two current collection tabs are mounted on the diagonal line of the electrode plate has the highest operating voltage. This is because, for example, when a current collecting tab is mounted on the upper left of the electrode plate, the polarization is maximized in the lower right portion corresponding to the diagonal line in the electrode plate.
It is presumed that this is because another current collecting tab was attached to the lower right part, so that the polarization of the entire electrode plate was minimized.

Measurement of Discharge Capacity and Charge / Discharge Cycle Life The storage batteries of Examples 1, 2 and Comparative Example
(0.1C) for 12 hours, then 24A (0.2
In C), the charge / discharge cycle of discharging to a discharge end voltage of 1.0 V was repeated, and the charge / discharge cycle characteristics of each storage battery were examined.

FIG. 16 shows the result. In FIG. 16, the horizontal axis represents the number of charge / discharge cycles (times), and the vertical axis represents the discharge capacity (Ah).

Table 1 also shows the number, the discharge capacity, and the cycle life of the current collecting tabs attached to the electrode plates of the three types of storage batteries. The cycle life was determined when the discharge capacity reached 50% of the initial capacity.

As is clear from FIG. 16 and Table 1, the storage batteries of Examples 1 and 2 in which two current collecting tabs are attached to the electrode plate according to the present invention have a large discharge capacity and a long cycle life. long.

In particular, the storage battery of Example 1 in which two current collection tabs are mounted on the diagonal line of the electrode plate has the largest discharge capacity and the longest cycle life. This is presumably because the polarization was minimized in Example 1 as described above, so that the current collection efficiency was improved and the discharge capacity was increased in the positive electrode.

On the other hand, in the negative electrode, since corrosion of the negative electrode alloy due to heat generation was suppressed, it is considered that the corrosion resistance was improved and the cycle life was prolonged.

(Embodiment 3) The electrode plate laminate 16 shown in FIG.
A first storage battery 400 having a structure shown in FIG. 17 and a second storage battery 500 having a structure shown in FIG. 18 are manufactured using
Was prepared.

Example 4 The electrode plate laminate 16 shown in FIG.
Was used to produce a storage battery 100 having the structure shown in FIG. 5, and ten of these were connected to produce an assembled battery.

The storage batteries were connected to each other by connecting bolts to each of the electrode terminals protruding and attached in a cylindrical shape as in the prior art.

(Evaluation) Using the assembled batteries of Examples 3 and 4 obtained as described above, the discharge capacity was measured under the same conditions as described above. That is, the battery pack is
A (0.1 C) for 12 hours and then 24 A (0.2 C)
In C), discharge was performed to a discharge end voltage of 1.0 V.

Table 2 shows the values of the obtained discharge capacities. Table 2 also shows the number of current collection tabs attached to the electrode plate of the storage battery used in the battery pack and the calculation results of the discharge capacity per battery volume.

[0068]

[Table 2]

As is clear from Table 2, according to the present invention,
The battery pack according to the third embodiment, in which the storage batteries are connected by contacting the terminals, has a larger discharge capacity per battery volume than the battery pack in the fourth embodiment, which is conventionally connected using bolts. .

This is presumably because in Example 3, the loss of volume due to the attachment of the terminals was reduced, and the volume of the entire assembled battery was reduced.

[0071]

As described above, according to the present invention, it is possible to obtain a storage battery having an increased operating voltage and discharge capacity and an improved charge / discharge cycle life, and a battery pack using the same.

[Brief description of the drawings]

FIG. 1 is a plan view showing a negative electrode plate used for a storage battery according to a first embodiment.

FIG. 2 is a plan view showing a positive electrode plate used in the storage battery of the first embodiment.

FIG. 3 is a diagram illustrating a structure of a storage battery according to the first embodiment.

FIG. 4 is a diagram illustrating the structure of the storage battery according to the first embodiment.

FIG. 5 is a perspective view showing the structure of the storage battery of the first embodiment.

FIG. 6 is a plan view showing a negative electrode plate used for the storage battery of the second embodiment.

FIG. 7 is a plan view showing a positive electrode plate used in a storage battery according to a second embodiment.

FIG. 8 is a diagram illustrating a structure of a storage battery according to a second embodiment.

FIG. 9 is a diagram illustrating the structure of a storage battery according to a second embodiment.

FIG. 10 is a perspective view illustrating a structure of a storage battery according to a second embodiment.

FIG. 11 is a plan view showing a negative electrode plate used for a storage battery of a comparative example.

FIG. 12 is a plan view showing a positive electrode plate used for a storage battery of a comparative example.

FIG. 13 is a diagram illustrating the structure of a storage battery of a comparative example.

FIG. 14 is a diagram illustrating a structure of a storage battery of a comparative example.

FIG. 15 is a perspective view showing a structure of a storage battery of a comparative example.

FIG. 16 is a diagram showing the relationship between the number of cycles and the discharge capacity of the storage batteries of Example 1, Example 2, and Comparative Example.

FIG. 17 is a perspective view showing a first storage battery used in the battery pack of the first embodiment.

FIG. 18 is a perspective view showing a second storage battery used in the battery pack of the first embodiment.

FIG. 19 is a diagram illustrating the structure of the battery pack according to the first embodiment.

FIG. 20 is a perspective view showing the structure of the battery pack of the first embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Current collection tab 2 Negative electrode plate main body 3 Positive electrode plate main body 14,24,34 Negative electrode plate 15,25,35 Positive electrode plate 16,26,36 Electrode plate laminated body 17,27,37,47,57 Battery case 18,28, 38, 48, 58 Negative terminal 19, 29, 39, 49, 59 Positive terminal 100, 200, 300, 400, 500 Square-type storage battery 600 Assembled battery In each drawing, the same reference numerals indicate the same or corresponding parts.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Reizou Maeda 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Kozo Nogami 2-chome Keihanhondori, Moriguchi-shi, Osaka No. 5-5 Sanyo Electric Co., Ltd. (72) Inventor Ikuro Yonezu 2-5-5 Sanyo Electric Co., Ltd. (72) Inventor Koji Nishio Keihanhondori, Moriguchi City, Osaka 2-5-5 Sanyo Electric Co., Ltd.

Claims (5)

[Claims] 1. A prismatic storage battery formed by stacking a plurality of electrode plates, wherein each of the electrode plates comprises: a rectangular electrode body; a first current collecting tab attached to an upper portion of the electrode body. And a second current collecting tab attached to a lower portion of the electrode body. 2. The rectangular storage battery according to claim 1, wherein the first and second current collecting tabs are mounted on a diagonal line of the rectangular electrode body. 3. The width of the first and second current collecting tabs is
The rectangular storage battery according to claim 1 or 2, wherein the width of the electrode main body is 20 to 48%. 4. A battery pack comprising a plurality of prismatic storage batteries assembled, wherein the first prismatic storage battery has two first polarities mounted on a first surface on a first diagonal line. An electrode terminal, and two second polarity electrode terminals mounted on a second surface facing the first surface on a second diagonal line in a direction different from the first diagonal line. The second prismatic storage battery includes two first polarity electrode terminals and two second polarity electrode terminals mounted so as to have a mirror image relationship with the first prismatic storage battery. An assembled battery, wherein the first prismatic storage battery and the second prismatic storage battery are connected in series by contacting electrode terminals having different polarities. 5. A battery pack comprising a plurality of the prismatic storage batteries according to claim 1, wherein the first prismatic storage battery has a first surface on a first surface. Two electrode terminals of a first polarity mounted on a diagonal line, and two electrode terminals mounted on a second surface facing the first surface on a second diagonal line in a direction different from the first diagonal line. And a second prismatic storage battery, wherein the second prismatic storage battery is attached to the first prismatic storage battery in a mirror image relationship with the first prismatic storage battery. And two second-polarity electrode terminals, wherein the first prismatic storage battery and the second prismatic storage battery are connected in series by contacting electrode terminals of different polarities. An assembled battery, characterized in that: