JP2002151025A - Assembled battery pack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a discharge gas passage along a laminated direction and a passage of cooling air along the laminated direction with a less ventilation resistance in an upper part of an assembled battery, and lessen assembling man hour by making the number of parts constituting an assembled battery pack less. SOLUTION: By mounting unit cells 22a, 22b in which exhaust gas valve 24a, 24b are mounted on one end of an upper part are alternately laminated to constitute the assembled battery 21 and by arranging discharge gas passage forming members 40a, 40b so as to be abutted on an upper part cover 30 and the assembled battery 21, the passage of the cooling air 36 and the discharge gas passages 48a, 48b along the laminated direction with the less ventilation resistance are formed on an upper direction of the assembled battery 21. Because the discharge gas passage formation members 40a, 40b seal the passage 36 of the cooling air, it is not necessary to use another sealing member, and the number of the parts constituting the assembled battery pack 20 can be reduced, and the assembling man hour of assembled battery pack 20 can be reduced as a result.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an assembled battery pack, and more particularly, to an assembled battery pack having an assembled battery formed by stacking a plurality of unit cells each having an exhaust gas valve capable of exhausting gas therein. .

[0002]

2. Description of the Related Art Heretofore, as an assembled battery pack of this type, there has been proposed an assembled battery pack in which a gas exhaust flow path from each unit cell is formed in a fastening stay of the unit cell formed by stacking a plurality of unit cells. (Eg, Japanese Patent Application Laid-Open No. 9-283106). In this assembled battery pack, the cells arranged with electrodes on both ends of the upper part and the exhaust gas valve in the center of the upper part are arranged in a battery box, and a stay that is bridged by the battery box and fastens each cell is provided on the exhaust gas valve. Installed to match. The inside of the stay is an exhaust passage for exhausting exhaust gas in the stacking direction.

[0003]

However, in such an assembled battery pack, an exhaust passage is formed in the center of the upper part of the assembled battery and a stay for fastening each unit cell is arranged. It is difficult to form a cooling air flow path along the stacking direction above the assembled battery. For this reason, a cooling air flow path is formed on the side surface of the assembled battery, but this leads to an increase in the number of components constituting the assembled battery pack, which increases the number of assembling steps.

An object of the battery pack of the present invention is to form an exhaust passage along the stacking direction and a cooling air passage along the stacking direction with low ventilation resistance at the top of the battery pack. Another object of the battery pack of the present invention is to reduce the number of parts constituting the battery pack to reduce the number of assembly steps.

[0005]

Means for Solving the Problems and Their Functions and Effects The battery pack of the present invention employs the following means to achieve at least a part of the above object.

The battery pack of the present invention is a battery pack having a battery stack comprising a plurality of unit cells each having an exhaust gas valve capable of exhausting internal gas mounted on the battery pack. An upper cover that forms a flow path for cooling air along the stacking direction with the assembled battery; and an upper cover that is arranged at a position matching an exhaust gas valve of each unit cell that constitutes the assembled battery. And an exhaust flow path forming member that forms an exhaust flow path that is in contact with the assembled battery and that discharges gas discharged from the exhaust gas valve along the stacking direction.

In the battery pack of the present invention, a cooling air flow path is formed along the stacking direction by the upper cover and the battery pack by attaching an upper cover disposed above the battery pack. By arranging the path forming member so as to abut the upper cover and the assembled battery at a position matching the exhaust gas valve of each unit cell constituting the assembled battery, the gas exhausted from the exhaust gas valve is exhausted in the stacking direction. An exhaust passage is formed. That is, a cooling air flow path and an exhaust flow path along the stacking direction can be formed on the upper part of the battery pack.

In the battery pack of the present invention, the unit cell has the exhaust gas valve disposed at at least one upper end, and the exhaust passage forming member is disposed at the upper end of the battery pack. It can also be. By doing so, most of the upper part of the battery pack can be used as a flow path for the cooling air, so that a flow path for the cooling air with low ventilation resistance can be obtained.

[0009] In the battery pack of the present invention in which the unit cells in which the exhaust valves are arranged at the upper end are stacked, the exhaust valves are alternately arranged at the upper end of the assembled battery. As described above, a plurality of the unit cells may be stacked, and the exhaust passage forming member may include two members disposed at both ends of an upper portion of the assembled battery. In this case, exhaust flow paths can be formed at both ends of the upper portion of the battery pack, and a flow path for cooling air can be formed at the center between them.

[0010] In the battery pack of the present invention in which the unit cells in which the exhaust gas valve is disposed at the upper end are stacked, the exhaust passage forming member is a member for sealing the cooling air passage. It can be. This eliminates the need for a separate sealing member, so that the number of components constituting the assembled battery pack can be reduced, and as a result, the number of steps for assembling the assembled battery pack can be reduced.

[0011]

Next, embodiments of the present invention will be described with reference to examples. FIG. 1 is an exploded perspective view schematically showing a configuration of a battery pack 20 according to one embodiment of the present invention, and FIG. 2 is a partial cross-sectional view illustrating a part of a cross section of the battery pack 20 of the embodiment. .

As shown in the drawing, the battery pack 20 of the embodiment has a battery pack 21 formed by alternately stacking chargeable / dischargeable cells 22a and 22b each having an exhaust gas valve 24a and 24b attached to one upper end. The upper cover 30 is attached so as to cover the upper part of the assembled battery 21, and is disposed at a position matching the exhaust gas valves 24 a and 24 b of the unit cells 22 a and 22 b so as to contact the assembled battery 21 and the upper cover 30. Exhaust flow path forming members 40a and 40b.

The upper cover 30 has two corners 32a, 32 that contact the exhaust flow path forming members 40a, 40b inside the upper part.
b, a flow path forming portion 34 having a swelling along the stacking direction of the battery pack 21 is formed in the central portion between the battery packs 2.
2, the cooling air flow path 36 is formed in the upper part of the assembled battery 21 along the stacking direction, as shown in FIG.

The exhaust flow path forming members 40a and 40b are formed in a gutter shape using an elastic material, for example, rubber such as EPDM, and the unit cells 22a and 2b are formed at the bottoms 42a and 42b.
A plurality of through holes 44a, 44b penetrating the exhaust gas valves 24a, 24b of 2b are formed at positions matching the exhaust gas valves 24a, 24b. Exhaust flow path forming members 40a, 40b
Is, as shown in FIG.
To seal the cooling air flow path 36 and the openings 46a and 46b are formed in the corners 32a,
32b, the exhaust gas valves 24a, 24b
Exhaust passage 48 for exhausting gas from the air along the stacking direction
a, 48b are formed.

The battery pack 20 of the embodiment described above
According to the present invention, unit cells 22a and 22b having exhaust gas valves 24a and 24b attached to one end of the upper part are alternately stacked to form the assembled battery 21 and the upper cover 30 and the assembled battery 2
By disposing the exhaust flow path forming members 40a and 40b so as to contact with the first and second exhaust gas flow paths 1 and 2, the exhaust flow paths 48a and 48b are formed. 36 and the exhaust passages 48a and 48b can be formed. Moreover, the exhaust passage forming member 40
a, 40b seals the cooling air flow path 36,
There is no need to use a separate sealing member. As a result, the number of components constituting the assembled battery pack 20 can be reduced, and the number of assembling steps of the assembled battery pack 20 can be reduced.

In the assembled battery pack 20 of the embodiment, the assembled batteries 21 are formed by alternately stacking the unit cells 22a and 22b having the exhaust gas valves 24a and 24b attached to one end of the upper part. May be configured by stacking unit cells to which a battery is attached. Also,
A unit cell having an exhaust gas valve attached to one end of the upper portion may be stacked so that the exhaust gas valves are arranged in a line to form a collective battery. In this case, the other end of the upper portion may seal the cooling air flow path 36 using a sealing member.

In the assembled battery pack 20 of the embodiment, the assembled batteries 21 are formed by alternately stacking the unit cells 22a and 22b having the exhaust gas valves 24a and 24b attached to one end of the upper part. The arrangement is not limited to the part, and the arrangement may be made at any position as long as they are arranged in one or more rows.

In the assembled battery pack 20 of the embodiment, the cooling air flow path 36 is sealed by the exhaust flow path forming members 40a and 40b, but may not be sealed.

In the assembled battery pack 20 of the embodiment, the exhaust passage forming members 40a and 40b are formed in a gutter shape. However, as shown in the modified exhaust passage forming member 140 of FIG. It may be.

The embodiments of the present invention have been described with reference to the embodiments. However, the present invention is not limited to these embodiments, and various embodiments may be made without departing from the scope of the present invention. Of course, it can be carried out.

[Brief description of the drawings]

FIG. 1 shows an assembled battery pack 20 according to an embodiment of the present invention.
FIG. 2 is an exploded perspective view schematically showing the configuration of FIG.

FIG. 2 is a partial cross-sectional view illustrating a part of a cross section of the assembled battery pack 20 of the embodiment.

FIG. 3 is a cross-sectional view schematically illustrating a configuration of an exhaust passage forming member 140 according to a modified example.

[Explanation of symbols]

20 battery pack, 21 battery pack, 22a, 22
b unit cell, 24a, 24b exhaust gas valve, 30 upper cover, 32a, 32b corner, 34 flow path forming part, 36
Cooling air flow path, 40a, 40b, 140 exhaust flow path forming member, 42a, 42b bottom, 44a, 44b through hole, 46a, 46b opening, 48a, 48b exhaust flow path.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Akira Suzuki 1 Ogataai Ogata, Kasuga-cho, Nishi-Kasugai-gun, Aichi F-term within Toyota Gosei Co., Ltd. (Reference) 5H040 AA33 AT02 AY05 AY08

Claims (4)

[Claims] 1. An assembled battery pack having an assembled battery in which a plurality of unit cells each having an exhaust gas valve capable of exhausting an internal gas mounted thereon are stacked. An upper cover that forms a flow path of cooling air along the stacking direction by the battery; and an upper cover that is disposed at a position matching an exhaust gas valve of each unit cell that constitutes the assembled battery and the upper cover and the assembled battery. An exhaust flow path forming member that forms an exhaust flow path that abuts and discharges gas discharged from the exhaust gas valve along the stacking direction. 2. The assembled battery pack according to claim 1, wherein the exhaust gas valve is disposed at at least one end of an upper portion of the unit cell, and the exhaust passage forming member is provided at an upper portion of the assembled battery. An assembled battery pack arranged at the end. 3. The assembled battery pack according to claim 2, wherein the assembled battery is formed by stacking a plurality of the unit cells such that the exhaust gas valves are alternately arranged at the upper end portion on the left and right sides. A battery pack comprising two members disposed at both ends of the upper portion of the battery pack, wherein the flow path forming member is provided. 4. The assembled battery pack according to claim 2, wherein the exhaust passage forming member seals the cooling air passage.