JP3257408B2 - Battery pack - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backup power supply for lighting and the like at the time of a power failure, and more particularly to a battery pack used as a backup power supply for lighting when a power supply to a train is stopped.

2. Description of the Related Art In recent years, power supply systems for ultra-high-speed trains and trains mainly use electric power from overhead lines through pantographs provided on the roofs of the trains. Has become. However, when high-voltage, large-current electricity is transmitted from the power station to the overhead line, considering the capacity of the power station and power transmission loss, instead of sending electricity to the entire area of the overhead line, for example, a section of the overhead line is divided every 25 km. Power supply. Therefore, between this power transmission section and the power transmission section, a section where electricity is not transmitted is provided for several tens of meters to several hundreds of meters. In the section where the electricity is not transmitted, the train is not supplied with power for several seconds, and runs due to the inertia of the running power, but the lighting in the train is extinguished.

[0003] Therefore, even in a short time, darkness or nighttime conditions are not desirable for passengers, so that a battery pack is provided on a train as a backup power supply for lighting during a power failure. Then, the battery pack supplies power as a power source for the illumination when power is not supplied, and keeps the illumination on. In order to secure as much space as possible for passengers in the train, the battery pack is usually mounted under the floor of the train. Further, the battery pack is used as a power source for raising and lowering the pantograph when the train enters the garage after inspection and the last train.

[0004]

2. Description of the Related Art Conventionally, such a battery pack has a capacity of 30A.
A plurality of cylindrical secondary batteries such as nickel-cadmium having a large capacity of h to 100 Ah are arranged in a line along the radial direction to form a battery row, and the batteries are electrically connected in series by a connecting body. To form a battery group, which is housed in a container including a case and a cover. The connection body used here was a nickel flat plate, and was spot-welded along with the connection plate while pressing the connection plate against the peripheral surface of the battery.

[0005]

However, in the above configuration, since the connecting plate is deformed and fixed at the time of welding the connecting plate, a restoring force and an internal stress always remain on the connecting plate, and a reliable welding strength is obtained. Had a problem that it was not possible to obtain Furthermore, since this battery pack is installed under the floor of the train, it is susceptible to the external environment.Especially during the running of the train, it is always affected by vibration, and the spot welding part of the connection plate connecting each battery is , Welding may break or break due to vibration. In that case, there is also a problem that it does not work as a backup power supply for lighting a train.

SUMMARY OF THE INVENTION The present invention solves such a problem. In spot welding of a connection plate to a battery case of a cylindrical battery, the connection body can be smoothly formed along the curved surface shape of the battery case. An object of the present invention is to provide a battery pack that performs reliable spot welding and has excellent welding strength with excellent vibration resistance and stable performance for a long period of time.

[0007]

In order to achieve the above object, a battery pack according to the present invention comprises a plurality of cylindrical batteries arranged in a line in a radial direction, and the battery pack is arranged between the batteries. In a battery group electrically connected in series with a connector and a battery pack containing the battery in a container, the connector has a curved shape along a curved surface of the battery case at one end connected to the battery case, and This curved portion has a substantially L-shape having a plurality of slits along the height direction of the battery.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present application is directed to a battery group in which a plurality of cylindrical batteries are arranged in a line and a battery group in which batteries are electrically connected in series by a connector. In a battery pack in which a battery pack is accommodated, the connecting body has a curved shape along the curved surface of the battery case at one end connected to the battery case, and a plurality of the curved portions along the height direction of the battery at the curved portion. It has a substantially L-shape with slits. Since the connection body has a plurality of slits in the height direction of the battery, the connection body follows the curved surface of the battery case without being pressed toward the battery case, so that spot welding can be reliably performed. For this reason, sufficient welding strength that can withstand the vibration during running of the train can be obtained. Further, by having the slit, the reactive current at the time of spot welding can be reduced, and a high welding strength can be secured.

[0009]

Next, an embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a perspective view of a battery pack according to the present invention in which a part of a container is cut away to show the inside. In FIG.
The battery 1 is a cylindrical nickel-cadmium storage battery having a size of 60 mm in diameter, a height of 180 mm, and a capacity of 60 Ah. Six batteries are arranged in a line in the radial direction, forming a total of three battery rows 2. are doing. The nickel connection plate 3 is spot-welded to form a battery group so that the batteries are electrically connected in series, and the battery group is housed in a container 4 formed of a case and a cover. Form a pack.

The connection plate 3 is connected to the peripheral surface of the case of the battery 1 here.
The connection will be described in detail. FIG. 2 is a partial perspective view of a battery group electrically connected in series. In FIG. 2, the connection plate 3 has a substantially L-shape,
And small projections 6 such as round grains protruding toward the peripheral surface of the case of the battery 1, and the small projections 6 are spot-welded to the peripheral surface of the case of the battery 1. When the connection plate 3 is spot-welded to the peripheral surface of the case of the battery 1, two series welding can be performed simultaneously by pressing a welding electrode against two small projections 6 on both right and left sides of the slit 5. . The shape of the small projection may be an oval or rectangular granular shape in addition to a round granular shape.

[0012] In order to obtain a required voltage, for example, four battery packs are arranged in series and connected in series.
It is placed under the floor of the train as a backup power supply for the train lighting. These battery packs are usually subjected to large lateral vibrations during use, that is, when the train runs.

Since the battery pack of the present invention has a plurality of slits 5 on one end side to which the connection plate 3 is welded, the connection plate 3 and the curved shape of the case of the battery 1 can be smoothly conformed to each other. Spot welding is possible. Further, the reactive current at the time of the spot welding can be reduced, and a high welding strength can be reliably obtained. Further, since the connection plate 3 has the small protrusions 6 facing the case side of the battery 1, the current at the time of spot welding to the battery case can be concentrated on the small protrusions 6, and the welding strength can be further improved. Can increase. Further, since the connection plate 3 has the slits 5, it has more flexibility than the flat plate to respond to the curve, and can be used widely for batteries having slightly different battery case diameters.

[0014]

As described above, according to the present invention, a battery array in which a plurality of cylindrical batteries are arranged in a row along the radial direction is electrically connected in series by a connecting body between the batteries. Battery group and a battery pack containing the same in a container, the connecting body has a curved shape along the curved surface of the battery case at one end connected to the battery case, and the curved portion has a height of the battery. Having a plurality of slits along the
The connector has a substantially L-shape, and the connector has a plurality of slits. Therefore, spot welding can be performed securely along the peripheral surface of the battery case without difficulty. It is possible to provide a battery pack which can secure a sufficient welding strength, is strong in vibration resistance, and has stable performance for a long time.

[Brief description of the drawings]

FIG. 1 is a perspective view of a battery pack according to an embodiment of the present invention, in which a part of a container is cut away to show the inside.

FIG. 2 is a perspective view showing a part of a battery group electrically connected in series by a connector.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylindrical battery 2 Battery row 3 Nickel connection plate 4 Container 5 Slit of connection plate 6 Small protrusion provided on connection plate

────────────────────────────────────────────────── ─── Continued from the front page (72) Inventor Minoru Matsushita 1006 Kazuma Kazuma, Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References JP-A-8-124549 (JP, A) 150269 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) H01M 2/10 H01M 2/20

Claims (2)

(57) [Claims] 1. A battery group in which a plurality of cylindrical batteries are arranged in a line along the radial direction, a battery group in which the batteries are electrically connected in series by a connector, and In the battery pack, the connection body has a curved shape along the peripheral surface of the battery case on one end side connected to the battery case, and the curved portion has a curved shape in the height direction of the battery. A substantially L-shaped battery pack having a plurality of slits along the same. 2. The battery pack according to claim 1, wherein the connection body has small projections located on both sides of the slit in parallel with the slit and protruding toward the battery case.