JP2002008605A - Power storage body module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power storage body module which has the shortest wire connection distance in case of arranging plural batteries. SOLUTION: In a secondary cell module 20 (power storage body module) having a plurality of lithium secondary cells 10 (power storage bodies) bound with each other by a module frame 16, each lithium secondary cell 10 is equipped with a pair each of positive electrode terminals 5 and negative electrode terminals 6 (storage body electrode terminals), at least two or more of which are connected in series through the positive electrode terminals 5 and the negative electrode terminals 6 to constitute a set of unit strings 20a, 20b, two sets which are arrayed in parallel. The positive electrode terminals 5 and negative electrode terminals 6 at the end of these unit strings 20a, 20b are each placed at four corners of the secondary cell module 20 to constitute module electrode terminals (module positive electrode terminals 21, module negative electrode terminals 22).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power storage module in which power storage units such as lithium secondary batteries are bound.

[0002]

2. Description of the Related Art Conventionally, a battery called a secondary battery has been widely used as a power supply capable of storing DC power by repeating charging and discharging and supplying a DC current to the outside as necessary. . In particular, in the field of electronic devices such as mobile phones, digital cameras, and notebook personal computers, their production has increased along with the promotion of miniaturization, thinning and weight reduction, and the amount of secondary batteries used as power sources has been increasing. Are also increasing rapidly.

Under such circumstances, secondary batteries as power sources are required to have higher performance, and lithium secondary batteries have been developed and widely used as high energy density batteries in place of lead storage batteries and nickel cadmium batteries. I have. This lithium secondary battery is not limited to a small and small-capacity battery for electronic devices as described above, but is also large and large, for example, for use in emergency power supply facilities and power storage facilities in factories and hospitals, or for powering electric vehicles. Capacities are also being developed. FIG. 6 illustrates a box-type lithium secondary battery as a configuration example of a large-sized secondary battery. Here, reference numeral 1 in the drawing denotes a case, 2 denotes a positive electrode, 3 denotes a negative electrode, 4 denotes a separator, 5 denotes a positive electrode terminal, 6 denotes a negative electrode terminal, 7 denotes a safety valve, and 10 denotes a lithium secondary battery. Electrolyte inside (not shown)
Is filled. In this lithium secondary battery 10, a large number of positive electrodes 2, separators 4, negative electrodes 3, separators 4, positive electrodes 2, separators 4, negative electrodes 3,... They are connected in parallel. Each positive electrode 2 is connected to a positive electrode terminal 5, and each negative electrode 3 is similarly connected to a negative electrode terminal 6. That is, a large number of unit batteries including the positive electrode 2, the separator 4, and the negative electrode 3 are all connected in parallel in the case 1.

[0004] The lithium secondary battery thus configured is often used as a secondary battery module 13 in which a plurality of lithium secondary batteries are combined as shown in FIG. The secondary battery module 13 includes a module frame 14 as a frame.
The secondary battery 10 is accommodated in the module frame 14 in a line with the positive terminal 5 and the negative terminal 6 alternately facing each other. Thereby, each secondary battery 10 is in a fixed state. One of each of the positive terminal 5 and the negative terminal 6 located at both ends is used as the positive terminal 13a and the negative terminal 13b of the secondary battery module, and the remaining positive terminal 5 and the negative terminal 6 are connected to the adjacent secondary battery. The negative electrode terminal 6 and the positive electrode terminal 10 are connected to each other in a conductive state by connection means 15. FIG. 8 schematically shows the secondary battery module 13.

[0005]

The secondary battery module 13 may be used by connecting a plurality of secondary battery modules 13 in series. In that case, in order to minimize the installation volume, the connection is made in close contact in the lateral direction. At this time, when trying to connect three or more in series, as shown in FIG.
3a and the negative electrode terminal 13b are largely separated from each other, and the connecting means 15 'for connecting them becomes long, resulting in a problem that a connection resistance is generated. Further, other electrode terminals 13
a 'and 13b' must be connected across
This has caused connection errors and short circuits.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a power storage module capable of minimizing a connection distance when a plurality of power storage modules are used side by side.

[0007]

According to a first aspect of the present invention, in a power storage module in which a plurality of power storage units are bound together by a module frame, each of the power storage units has a pair of storage electrode terminals. A power storage unit, wherein at least two or more of the power storage units are connected in series via the storage unit electrode terminals to form a set of unit rows, and an even number of the unit rows are provided in parallel; The storage electrode terminals at the ends of the unit rows located at the four corners of the module are module electrode terminals.

In this power storage module, there are a total of four module electrode terminals located at the four corners. Thus, no matter what direction the power storage modules are arranged adjacent to each other, the module electrode terminals always face each other, so that the connection distance between these module electrode terminals can be reduced. This module electrode terminal is used for any of the following connections. That is, the connection with the module electrode terminal of the adjacent unit row, the connection with the module electrode terminal of another power storage module, and the connection with the discharge destination (power receiving source). Further, this module electrode terminal is not connected to another storage electrode terminal in the same unit row.

According to a second aspect of the present invention, in the power storage module of the first aspect, the module electrode terminals are two module positive terminals and two module negative terminals, and these module positive terminals are provided. And the pair of module negative terminals are respectively arranged on diagonal lines on the upper surface of the electrode storage module.

When a plurality of power storage modules are arranged adjacently in the same posture, the module positive terminal and the module negative terminal always face each other, regardless of the direction in which they are adjacent. Therefore, the module positive terminal and the module negative terminal can be connected with the shortest distance.

According to a third aspect of the present invention, in the power storage module according to the first aspect, the arrangement direction of the power storage units constituting each of the unit rows is such that the pair of storage units of the power storage units is arranged in the same direction. It is characterized by being along a linear extension connecting body electrode terminals.

In this power storage module, the distance between two sets of unit rows provided in parallel is the shortest. Therefore, the connection distance between the module electrode terminals of adjacent unit rows is minimized.

[0013] The invention according to claim 4 is the invention according to claims 1 to 3.
In the power storage module according to any of the above, the pair of storage electrode terminals of the power storage body are a storage body positive terminal and a storage body negative terminal, and adjacent power storage bodies are mutually the storage body positive terminal. And the storage body negative electrode terminal are arranged close to each other.

In this power storage module, adjacent power storages in one unit row always have their storage positive terminals and storage negative terminals facing each other. The storage body negative electrode terminal can be connected with the shortest distance. Further, in the adjacent unit rows, the module positive terminal and the module negative terminal are in the facing state, so that the connection distance between the module positive terminal and the module negative terminal can be shortened.

[0015] The invention according to claim 5 is the invention according to claims 1 to 4.
The power storage module according to any one of the preceding claims, wherein the power storage is a lithium secondary battery.

That is, it is particularly effective to apply the present invention to a lithium secondary battery which is often used as a large-sized and large-capacity module.

[0017]

Next, one embodiment of the present invention will be described. FIG. 1 shows a secondary battery module (power storage module) 20 in which a plurality of lithium secondary batteries (power storage bodies) are bound. (a) is a perspective view, and (b) is a top view schematically showing (a). Since the configuration of the lithium secondary battery 10 itself is the same as that of the related art (see FIG. 6), description thereof is omitted. Secondary battery module 20
Is constituted by connecting at least two or more lithium secondary batteries 10 in series via respective positive electrode terminals (storage body positive terminals) 5 and negative electrode terminals (storage body negative terminals) 6 to form a set of unit rows 20a. Another unit row 20b is provided in parallel with the unit row 20a. These unit rows 20a and 20b are bound by a module frame 16. The module frame 16 is a frame that houses and binds the respective lithium secondary batteries 10.

In one unit row 20a (20b), two lithium secondary batteries 1 are placed with the positive terminal 5 and the negative terminal 6 of each lithium secondary battery 10 facing each other.
0 are both arranged on a straight line extension connecting the positive electrode terminal 5 and the negative electrode terminal 6. Also, the unit row 20a and the unit row 20b
, The directions of the lithium secondary batteries 10 are opposite to each other, and the positive terminal 5 of the lithium secondary batteries 10 in the unit row 20a is
And the negative electrode terminal 6 face the negative electrode terminal 6 and the positive electrode terminal 5 of the lithium secondary battery 10 in the unit row 20b, respectively.
In each of the unit rows 20a and 20b, each lithium secondary battery 10 is connected in series via a connection means 15 for connecting between the positive terminal 5 and the negative terminal 6. There are two positive electrode terminals 5 and two negative electrode terminals 6 at the ends of the series circuit. The pair of the positive electrode terminal 5 and the pair of the negative electrode terminals 6 are referred to as a module positive terminal 21 and a module negative terminal 22, respectively. It is located at four diagonal corners on the upper surface of the next battery module 20.

The secondary battery module 20 configured as described above is used as an assembled battery as shown in FIGS. Although the secondary battery modules 20 are shown separated from each other in these figures, they are actually used in contact with each other. FIG. 2 shows that the secondary battery module 20 is
It is an example of the battery pack 30 arrange | positioned at a time. The postures of the respective secondary battery modules 20 are all in the same direction, and the module positive terminal 21 of one secondary battery module 20 and the module negative terminal 22 of the adjacent secondary battery module 20
Are in the vertical and horizontal directions on the paper. Then, (1) the module positive terminal 21 and the module negative terminal 22 of the adjacent secondary battery module 20 are appropriately connected, and (2) one secondary battery module 2
Within 0, module positive terminal 21 and module negative terminal 2
2 is connected appropriately to form a series circuit. In the case of the assembled battery 30 of FIG. 2, the positive terminal 31 and the negative terminal 32 when the entire assembled battery 30 is considered as one battery are located in one secondary battery module 20. 3 shows an assembled battery 35 in which the secondary battery modules 20 are arranged in the front-rear direction, and FIG. 4 shows an assembled battery 36 in which the secondary battery modules 20 are arranged in the lateral direction. These assembled batteries 35, 36
Also, in the same manner as in the assembled battery 30, the postures of the respective secondary battery modules 20 are all in the same direction, and (1) the module positive terminal 21 and the module negative terminal 22 of the adjacent secondary battery modules 20 are appropriately connected. And (2) the module positive electrode terminal 2 in one secondary battery module 20.
1 and the module negative terminal 22 are appropriately connected to form a series circuit.

In the above-described secondary battery module 20 of the present embodiment, when a plurality of battery modules 30, 35, and 36 are used side by side, the module positive terminal 21 and the module negative terminal 22 to be connected are located at the shortest distance. Therefore, the connection distance becomes the shortest, and the connection resistance can be suppressed. Further, in the conventional secondary battery module 20, connection has to be performed across electrode terminals as shown in FIG. However, in this example, since it is only necessary to connect the adjacent module electrode terminals, a connection error and a short circuit between the connections can be prevented. When a plurality of secondary battery modules 20 are arranged, the module positive terminal 21 and the module negative terminal 22 are always adjacent to each other. Therefore, the degree of freedom of arrangement of the secondary battery module 20 when forming the assembled battery can be improved. Furthermore, in the examples of FIGS. 2 and 4, the positive terminal 31 and the negative terminal 32 when the entire assembled batteries 30 and 36 are considered as one battery are located in one secondary battery module 20. As described above, depending on the arrangement of the secondary battery module 20, the positive electrode terminal 31 and the negative electrode terminal 32 can be made closer to each other, and wiring becomes easier.

In the above, the unit rows 20a, 2
0b is provided with two lithium secondary batteries 10 respectively, but is not limited to this. Three lithium secondary batteries 10 are respectively provided as in the secondary battery module 20 ′ of FIG. The unit rows 20a 'and 20b' provided may be provided. Further, four or more of them may be provided. The number of unit rows is not limited to two, and may be any number of even numbers. The direction in which the secondary batteries constituting the unit row are arranged does not necessarily have to be along a straight line connecting the positive electrode and the negative electrode of the secondary battery. For example, when using a cylindrical secondary battery, the connection between the electrodes can be minimized by arranging the straight line connecting the positive electrode and the negative electrode with respect to the direction of disposing the secondary battery in the unit row. May be possible. Furthermore, although a lithium secondary battery has been described as the power storage unit, the present invention is not limited to this, and other batteries and capacitors may be used.

[0022]

As described above, in the power storage module of the present invention, when a plurality of power storage modules are used side by side, since the module electrode terminals to be connected are located at the shortest distance, the connection distance is shortest. As a result, it is possible to suppress the connection resistance. Further, in the conventional secondary battery module, the connection had to be performed across the electrode terminals, but in the power storage module of the present invention, the adjacent module electrode terminals may be connected to each other. It is also possible to prevent a short circuit between the connections.

[Brief description of the drawings]

FIG. 1 shows a secondary battery module according to an embodiment of the present invention, in which (a) is a perspective view and (b) is a top view schematically showing (a).

FIG. 2 is a top view of an assembled battery using the secondary battery module.

FIG. 3 is a top view of an assembled battery using the secondary battery module.

FIG. 4 is a top view of an assembled battery using the secondary battery module.

FIG. 5 is a top view of a secondary battery module shown as another embodiment of the present invention.

FIG. 6 is a partially broken perspective view showing a configuration of a lithium secondary battery.

FIG. 7 is a perspective view of a conventional secondary battery module.

FIG. 8 is a top view schematically showing FIG. 7;

FIG. 9 is a top view of a battery pack using a conventional secondary battery module.

[Explanation of symbols]

5 Positive terminal (storage positive terminal) 6 Negative terminal (storage negative terminal) 10 Lithium secondary battery (power storage) 16 Module frame 20, 20 'Secondary battery module (power storage module) 20a, 20b Unit column 21 Module positive terminal 22 Module negative terminal

Claims (5)

[Claims] 1. A power storage module in which a plurality of power storage units are bound together by a module frame, wherein each of the power storage units includes a pair of storage electrode terminals, and at least two or more of the power storage units are connected to the storage unit. The unit rows are connected in series via body electrode terminals to form a set of unit rows, and the unit rows are provided in even numbers in parallel, and the storage at the end of the unit row located at the four corners of the power storage module. A power storage module, wherein the body electrode terminal is a module electrode terminal. 2. The power storage module according to claim 1, wherein the module electrode terminals are two module positive terminals and two module negative terminals, and a pair of the module positive terminals and a module negative terminal. The power storage module, wherein the pairs are respectively arranged on diagonal lines on the upper surface of the electrode storage module. 3. The power storage module according to claim 1, wherein an arrangement direction of the power storage units forming each unit row is:
A power storage module, wherein the power storage module extends along a straight line extending between the pair of storage electrode terminals. 4. The power storage module according to claim 1, wherein the pair of storage electrode terminals of the power storage unit are a storage unit positive electrode terminal and a storage unit negative electrode terminal, and the adjacent power units are connected to each other. The power storage module, wherein the storage body is arranged such that the storage body positive terminal and the storage body negative terminal are close to each other. 5. The power storage module according to claim 1, wherein the power storage is a lithium secondary battery.