JP2009043670A - Exhaust gas tube of battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an exhaust gas tube of a battery easily attachable, and capable of reducing cost by reducing the number of components. <P>SOLUTION: The exhaust gas tube of a battery includes: safety valve mounting parts 6 each formed of a synthetic resin material (PE-based resin) and connected to a discharge port 5 of a safety valve 4; and an exhaust pipe 7 having a predetermined inner diameter, communicating with and connected to the safety valve mounting parts 6, and guiding and exhausting hydrogen gas to the outside. Accordion parts 8 extensible in the axial direction of the exhaust pipe 7 are arranged at parts between the safety valve mounting parts 6 of the exhaust pipe 7. Hydrogen gas generated in a plurality of battery units 2s constituting a laminated battery 2 is exhausted to the outside without leaking it by connecting the safety valves 4 arranged on a housing 3 of the respective battery units 2s to the safety valve mounting parts 6 of the exhaust gas tube 1 to communicate with each other. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an exhaust gas tube in a battery that is easy to assemble, can reduce the number of parts, and can reduce costs.

In recent years, automobiles and construction machines such as construction machines have adopted so-called hybrid systems that enable efficient operation by effectively using the engine while saving energy. In a hybrid system, a nickel metal hydride battery (NiMH battery) is known as a battery used as a power storage device.
Nickel metal hydride batteries have characteristics such as high current discharge and wide usable temperature range, but care must be taken when overcharging.
This is because hydrogen gas is generated inside the battery when overcharged.
For this reason, a safety valve is provided to release the gas when an internal pressure exceeding a certain level is generated by this hydrogen gas, and an exhaust gas tube is connected to the discharge port of the safety valve, and hydrogen gas is externally connected for safety measures such as ignition prevention. To be discharged into the atmosphere.

For example, Patent Document 1 aims to ensure sealing even when a unit battery expands due to an increase in internal pressure.
That is, in Patent Document 1, an assembled battery 16 in which a plurality of unit cells 2 each having a safety valve 10 that discharges a gas when an internal pressure of a certain level or more is generated is arranged in parallel, along the arrangement direction of the unit cells 2. The discharge port 14 of the safety valve 10 of each unit battery 2 is connected to one or a plurality of exhaust gas tubes 17 that are disposed and connected to an external exhaust part, and the discharge port 14 of the safety valve 10 due to expansion of the unit battery 2 is connected. A gas discharge device is provided in which the change in the interval is absorbed by extension of the bellows portion 22 of the exhaust gas tube 17 or extension of the exhaust gas tube 17 disposed.

JP 2001-110377 A

  As a result, “the unit battery expands due to the increase in its internal pressure, and even if the interval between the discharge ports of the safety valve is widened, an excessive force may act on the connection between the exhaust gas tube and the discharge port, resulting in incomplete sealing between them. Can be eliminated, and leakage of hydrogen gas can be surely prevented. "

However, in the above-described exhaust gas tube, since the constituent material is rubber, since it is made by combining parts of a plurality of modules of the battery to assemble into one exhaust gas tube, it takes time and effort to manufacture.
Also, in order to ensure the safety valve discharge port and sealing performance, it requires a certain amount of wall thickness, becomes heavier, and forms an umbrella-shaped protrusion or an annular lip, making the production complicated. There is no choice but to increase the number of parts such as providing support clips.
The present invention has been proposed in order to improve the above-described problems. In the battery, the assembling property is improved, the safety is high, the number of parts can be reduced, and the cost can be reduced. An object is to provide an exhaust gas tube.

  In order to solve the above-mentioned problem, in the invention described in claim 1, it is a stacked structure that is arranged adjacent to each other and discharges the gas generated inside through a safety valve provided in the housing to the outside. In the battery, an exhaust gas tube in the battery that is connected to the safety valve so as to be discharged without leaking to the outside, the safety valve mounting portion connected to the discharge port of the safety valve, and the safety valve mounting portion connected to the safety valve And a flexible discharge pipe that guides and releases gas to the outside, and the safety valve mounting portion and the discharge pipe are integrally formed of a synthetic resin material.

  Thereby, the assembling property is improved, the safety is high, the number of parts can be reduced, and the cost can be reduced.

  The invention according to claim 2 is characterized in that an extendable bellows portion is provided at a portion between the safety valve mounting portions of the discharge pipe.

  As a result, when the gas is generated inside the battery, the internal volume of the housing expands, and even if the position of the safety valve is displaced, the bellows part expands and contracts, so that the displacement can be absorbed and the sealing performance is impaired. There is no.

Hereinafter, an embodiment of the exhaust gas tube in the battery according to the present invention will be described.
FIG. 1 shows an exhaust gas tube 1 in a battery.
The exhaust gas tube 1 is used for a laminated battery 2, and a plurality of single batteries constituting the laminated battery 2 are connected by connecting a safety valve 4 provided in a housing 3 of each battery single body 2 s to the exhaust gas tube 1. The hydrogen gas generated inside 2s is discharged without leaking outside.
That is, the exhaust gas tube 1 is made of a synthetic resin material, which will be described later, and is connected to the safety valve mounting portion 6 connected to the discharge port 5 of the safety valve 4 and the safety valve mounting portion 6 to guide hydrogen gas to the outside. A discharge pipe 7 having a predetermined inner diameter is discharged.
And the bellows part 8 which can be expanded-contracted to the discharge pipe 7 axial direction is provided in the site | part between the safety valve attachment parts 6 in the discharge pipe 7. As shown in FIG.

  As a synthetic resin material constituting the exhaust gas tube 1 as described above, for example, PE. (Polyethylene resin), or PP. (Polypropylene resin) or PA. (Polyamide resin).

  Further, the exhaust gas tube 1 has a total length corresponding to the stacked battery 2 to be used, and corresponds to the number of battery single bodies 2s constituting the stacked battery 2, that is, corresponds to the number of safety valves 4. And the safety valve mounting part 6 is provided so that the space | interval of the adjacent safety valve 4 may be adapted.

And when the bellows part 8 is shape | molded with the above-mentioned shaping | molding method, while making thickness into the thickness of a predetermined range from the viewpoint of stretchability and moldability, the height H of the peak is 4 to 4.5 mm.
As a result of various trial production studies, when the height H of the mountain is 4 mm, for example, the stretchability is not good, but the moldability is good. On the other hand, it has been found that when the height H of the mountain is 4.5 mm, for example, the stretchability is good, but the moldability is relatively lowered.

The exhaust gas tube 1 in the battery as described above can be formed as a single long tube by integrally molding a synthetic resin material (here, PE. Resin) by a predetermined molding method.
When the exhaust gas tube 1 is attached to the stacked battery 2 to be used, the attachment is completed by fitting the discharge port 5 of the safety valve 4 of each battery unit 2s so as to cover the opening of the corresponding safety valve attachment portion 6. (See FIG. 4).
In this case, since the opening of the safety valve mounting portion 6 is forcibly expanded and fitted to the discharge port 5 of the safety valve 4 for each battery unit 2s, the discharge port 5 of the safety valve 4 and the safety valve mounting portion 6 are fitted. The sealing property with the opening of the is secured.
Thus, since the exhaust gas tube 1 is fitted to the discharge port 5 of the safety valve 4 for each battery unit 2s so as to cover the opening of the corresponding safety valve mounting portion 6, the mounting is completed, so that the mounting is easy. It is.

Next, when overcharging is performed during driving of the vehicle, hydrogen gas is generated from each battery unit 2s in the stacked battery 2, so that the internal pressure in the housing 3 of the battery unit 2s rises and the housing 3 Is deformed, and the position near the safety valve 4 part is slightly shifted (about 5 mm).
However, since the bellows portion 8 between the safety valve mounting portions 6 in the discharge pipe 7 is displaced following the positional shift, the positional shift of the safety valve 4 can be absorbed, and the discharge port 5 of the safety valve 4 and the safety valve mounting portion 6 can be absorbed. The sealing performance with the opening is not impaired.

In this way, even when hydrogen gas is generated due to overcharging during vehicle operation, the hydrogen gas is discharged from the discharge port 5 of the safety valve 4 for each battery unit 2 s through the safety valve mounting portion 6 of the exhaust gas tube 1. It can flow into the interior, pass through the discharge pipe 7 in the direction of the arrow shown in FIG. 3, and can be discharged out of the vehicle.
Thereby, dangers, such as ignition by retention of hydrogen gas, can be avoided as much as possible.

It is an external appearance perspective view which shows an example of the exhaust gas tube and battery in the battery concerning this invention. It is a front view of the exhaust gas tube shown in FIG. It is sectional drawing which follows BB of the exhaust gas tube shown in FIG. It is an expanded sectional view of A part in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Exhaust gas tube 2 Stacked battery 2s Single battery 3 Case 4 Safety valve 5 Discharge port 6 Safety valve attachment part 7 Discharge pipe 8 Bellows part

Claims (2)

  In a stacked battery that is arranged adjacent to each other and discharges the gas generated inside to the outside via a safety valve provided in the housing, it is connected to the safety valve and discharged without leaking outside. An exhaust gas tube in the battery, wherein a safety valve mounting portion connected to the discharge port of the safety valve, a flexible discharge pipe that communicates with the safety valve mounting portion and guides and discharges gas to the outside. An exhaust gas tube in a battery, wherein the safety valve mounting portion and the discharge pipe are integrally formed of a synthetic resin material.   2. The exhaust gas tube in a battery according to claim 1, wherein a bellows part that can be expanded and contracted is provided at a portion between the safety valve attachment parts in the discharge pipe.

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