JP6855211B2 - Power supply - Google Patents

Description

The present invention relates to a power supply device in which an exhaust duct is connected to an exhaust valve of a secondary battery so that high-temperature gas discharged from an exhaust valve that opens is discharged to the outside through the exhaust duct, and particularly high-temperature gas is discharged. Regarding power supply devices that can be safely exhausted to the outside.

A power supply device including a secondary battery is provided with an exhaust valve on the outer can to prevent the outer can of the battery from exploding. The exhaust valve opens when the internal pressure of the outer can becomes higher than the threshold pressure to prevent the outer can from bursting due to an increase in the internal pressure. In order to exhaust the high temperature gas of the exhaust valve to be opened to the outside, a power supply device in which an exhaust duct is connected to the exhaust valve of the battery has been developed. (See Patent Documents 1 to 3)

In these conventional power supply devices, an exhaust duct is connected to the exhaust valve of the battery, and high-temperature gas from the exhaust valve that opens is discharged to the outside. On the other hand, in recent years, batteries with high energy density have been developed. In a battery having a high energy density, the temperature of the gas discharged from the exhaust valve tends to increase or the amount of gas discharged from the exhaust valve tends to increase as the energy density of the battery increases. Therefore, it is important to lower the temperature while the gas discharged from the exhaust valve passes through the exhaust duct, but there is a problem that the exhaust duct becomes long and the power supply device becomes large.

International Publication No. 2012/014449 Japanese Unexamined Patent Publication No. 2016-81793 Japanese Unexamined Patent Publication No. 2011-70872

The present invention has been developed for the purpose of solving the above-mentioned drawbacks of the conventional power supply device. An important object of the present invention is to provide a power supply device having an extremely simple structure that can lower the temperature of a high-temperature gas and safely discharge the gas.

Means for Solving Problems and Effects of Invention

The power supply device of the present invention includes a secondary battery having an exhaust valve that opens when the pressure becomes higher than the threshold pressure and discharges gas, and an exhaust duct connected to the exhaust valve of the secondary battery. The discharge duct has a plurality of expansion chambers and a plurality of throttle openings, and the discharge port of the expansion chamber on the wind side and the inflow port of the expansion chamber on the leeward side are connected via the throttle opening to connect the expansion chamber and the throttle. The openings are connected in series with each other, and the gas ejected from the exhaust valve that opens is alternately passed through the expansion chamber and the throttle opening and discharged to the outside.

The above power supply device has a feature that the temperature of the high temperature gas discharged from the exhaust valve can be lowered with an extremely simple structure while suppressing the increase in size of the power supply device. That is, since the discharge duct of the above power supply device alternately connects the plurality of expansion chambers and the plurality of throttle openings and connects them in series, the high temperature gas passing through the expansion chambers and the throttle openings alternately is not allowed. This is because each time it flows into the expansion chamber from the aperture opening, it expands and the temperature drops. According to this configuration, the temperature of the gas can be lowered while suppressing the increase in size of the power supply device by changing the cross-sectional area of the flow path. In particular, since a plurality of expansion chambers and throttle openings are provided, the high temperature gas expands and gradually lowers in temperature each time it flows into the expansion chamber from the throttle openings, and the temperature drops sufficiently when it is discharged from the last expansion chamber. And safely discharged. Further, when the high temperature gas discharged from the opened exhaust valve flows into the expansion chamber through the throttle opening, the temperature is also lowered by being mixed with the air in the expansion chamber. Further, the high temperature gas flowing into the expansion chamber from the throttle opening passes through the throttle opening and is injected into the expansion chamber at a high flow velocity. The high-temperature gas flowing at high speed efficiently agitates the air in the expansion chamber, and is sufficiently mixed with the normal temperature air in the chamber to further lower the temperature. Furthermore, since the flow velocity is reduced by alternately passing through the expansion chamber and the throttle opening multiple times, the flow velocity of the high-temperature gas jetted vigorously from the exhaust valve is reduced, and the gas is discharged as a low-temperature gas for safety. Improve sex.

Since the power supply device of the present invention discharges the high temperature gas from the discharge duct in which the plurality of expansion chambers and the plurality of throttle openings are alternately connected in series, the high temperature gas passes alternately between the diaphragm openings and the expansion chambers. The gas is decelerated by causing it to decelerate, and each time it flows into the expansion chamber from the throttle opening, it expands to lower the temperature, and the low-temperature gas is discharged from the discharge duct at a low speed.
That is, in the above power supply device, the high temperature gas ejected from the exhaust valve is lowered by expansion, mixed with the room temperature air in the chamber to lower the temperature, and safely discharged as a low temperature gas with no uneven temperature. Realize the characteristics to be used.

The above features are particularly important in a large-capacity power supply device. This is because it is required to prevent the harmful effect that the high temperature gas injected from the exhaust valve is ejected into the air and spontaneously ignites in all applications. The probability that the exhaust valve of the secondary battery will open is extremely low. It rarely occurs before a huge number of power supplies are manufactured and discarded. For this reason, it is important to realize a structure that prevents spontaneous combustion of the high-temperature gas that the exhaust valve opens and injects at low cost.

The power supply device of the present invention may have a structure in which the expansion chamber is formed into an elongated hollow shape having both ends closed, and an inflow port and an outlet are provided at non-opposing positions on the side surfaces of the expansion chamber.

In the discharge duct of the above power supply device, the high temperature gas flowing into the expansion chamber from the inflow port collides with the inner surface of the expansion chamber, changes direction, and is discharged from the discharge port. The hot gas changes direction inside the expansion chamber and flows into the throttle opening, and the high temperature gas that passes through the throttle opening and flows into the expansion chamber collides with the inner surface of the expansion chamber and changes direction, and also It is decelerated by colliding with the inner surface, and the high temperature gas and the normal temperature air in the expansion chamber are efficiently agitated, and the temperature is lowered and discharged without temperature unevenness. In addition, while the above structure is an extremely simple structure, a high-temperature gas collides with the inner wall to decelerate the speed, so that a feature that can be safely discharged is also realized.

The exhaust duct of the power supply device of the present invention comprises a first expansion chamber connected to the exhaust valve of the secondary battery and a second expansion chamber connected to the first expansion chamber via a throttle opening. The first expansion chamber and the second expansion chamber can be arranged adjacent to each other in a posture parallel to each other.

In the above power supply device, since the first expansion chamber and the second expansion chamber provided in the discharge duct are arranged adjacent to each other in a parallel posture, the discharge duct is arranged in a narrow space to safely discharge high temperature gas. There are features that can be done.

The power supply device of the present invention has a first expansion chamber connected to the exhaust valve of the secondary battery to the discharge duct, and a second expansion chamber connected to the first expansion chamber via a throttle opening. , A third expansion chamber formed by connecting the second expansion chamber via a throttle opening is provided, and the first expansion chamber and the second expansion chamber are arranged adjacent to each other in a posture parallel to each other. The second expansion chamber is provided with a protrusion protruding from the first expansion chamber, and the third expansion chamber is arranged adjacent to the surface of the protrusion of the second expansion chamber and the end of the first expansion chamber. be able to.

The above power supply device efficiently discharges the first to third expansion chambers in a narrow space while more safely discharging the high temperature gas discharged from the exhaust valve by the discharge duct provided with the first to third expansion chambers. There is a feature that it can be read and placed.

The power supply device of the present invention can be arranged in the longitudinal direction of the first expansion chamber to open the inflow port connecting the exhaust valve of the secondary battery.

In the above power supply device, the exhaust valves of a plurality of secondary batteries are connected to the first expansion chamber, the temperature of the high temperature gas discharged from any of the exhaust valves is lowered in the first expansion chamber, and the temperature is further lowered. It has the feature that it can be discharged to the expansion chamber on the side.

The power supply device of the present invention is provided with a thin tube having one end connected to the throttle opening and the other end connected to the expansion chamber on the leeward side, and the gas discharged from the exhaust valve to be opened flows at high speed through the throttle opening. With a negative pressure, a thin tube can be used to circulate the gas in the expansion chamber on the leeward side to the throttle opening.

The above power supply device has a feature that the temperature of the high temperature gas can be lowered and discharged. This is because the air in the expansion chamber on the leeward side can be circulated to the throttle opening by the thin tube, and the high temperature gas can be more effectively agitated and discharged to the air in the expansion chamber. Further, since the thin tube flows the air in the expansion chamber on the discharge side into the throttle opening, mixes it with the high temperature gas and discharges it to the expansion chamber, the air in the expansion chamber on the leeward side with a low temperature is mixed with the high temperature gas. It also realizes the feature that the temperature can be lowered. Further, since the air in the expansion chamber is made to flow into the throttle opening through the thin tube, the flow velocity of the high temperature gas flowing into the expansion chamber from the throttle opening is increased, and the high temperature gas is agitated more efficiently in the expansion chamber to allow the high temperature gas to flow. It also realizes the feature that the temperature can be lowered uniformly and discharged.

In the power supply device of the present invention, the secondary battery can be a non-aqueous electrolyte secondary battery, and the internal volume of the expansion chamber can be made larger than the internal volume of the secondary battery.

Hereinafter, examples of the present invention will be described with reference to the drawings. However, the examples shown below exemplify a power supply device for embodying the technical idea of the present invention, and the present invention does not specify the power supply device as the following.

Further, in order to make it easier to understand the scope of claims, this specification shows the numbers corresponding to the members shown in the examples in "Claims" and "Columns for means for solving problems". It is added to the member. However, the members shown in the claims are by no means specified as the members of the examples.

The power supply device of FIG. 1 includes a plurality of secondary batteries 1 and an exhaust duct 3 connected to an exhaust valve 2 of each secondary battery 1. Since the secondary batteries 1 can be connected in parallel to increase the output current and can be connected in series to increase the output voltage, the secondary batteries 1 can be connected in parallel to obtain the optimum output voltage and output current for the application of the power supply device. The number to be connected to and the number to be connected in series are specified. For example, a power supply device mounted on a hybrid car or an electric vehicle to supply electric power to a traveling motor has a secondary battery 1 connected so that a maximum output current is several hundred A and an output voltage is several hundred V.

The secondary battery 1 is a lithium ion secondary battery. Non-aqueous electrolyte secondary batteries such as lithium ion secondary batteries have a large charge / discharge capacity with respect to weight and volume, and the power supply device can be made smaller and lighter to increase the charge / discharge capacity. However, the power supply device of the present invention does not specify the secondary battery 1 as a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery, and uses all the secondary batteries 1 currently used or will be developed in the future. it can. Since the temperature of the exhaust gas of a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery is particularly high, it is important to lower the temperature of the gas and discharge the gas. Since the exhaust valve 2 opens in an abnormal usage environment, it is extremely important that the gas discharged from the exhaust valve 2 is safely discharged by lowering the gas temperature in the exhaust duct 3. The discharge duct 3 connects the expansion chamber 4 and the throttle opening 5 in series in order to lower the temperature of the exhaust gas and discharge the gas.

2 and 3 are cross-sectional views showing the flow state of the gas inside the discharge duct that lowers the temperature of the high-temperature gas and discharges it.

In the expansion chamber 4 of FIG. 2, high-temperature gas flows into the inside from the inflow port 7 arranged at a position not opposed to the discharge port 6. As shown in the cross-sectional view of FIG. 2, the high-temperature gas flowing into the expansion chamber 4 from the inflow port 7 collides with the inner wall surface of the hollow chamber located at a position facing the inflow port 7, is decelerated, and is further dispersed to the surroundings. Then, it is mixed with the air in the expansion chamber 4 and the temperature is lowered. This is because the temperature of the air in the expansion chamber 4 is lower than the temperature of the hot gas. Further, the high temperature gas expands and the temperature drops when it is injected from the throttle opening 5 into the expansion chamber 4. Since the discharge duct 3 connects the plurality of throttle openings 5 and the plurality of expansion chambers 4 in series, it expands each time it flows into the expansion chamber from the throttle openings and the temperature gradually decreases. Therefore, the gas discharged from the discharge duct 3 repeatedly expands to lower the temperature, and is further mixed with the air in the expansion chamber to further lower the temperature.

The expansion chamber 4 of FIG. 3 has an elongated shape in the gas flow direction, and allows high-temperature gas to flow into the inside from an inflow port 7 arranged at a position not opposed to the discharge port 6. The high-temperature gas flowing into the expansion chamber 4 from the inflow port 7 collides with the inner wall surface of the hollow chamber at a position facing the inflow port 7 and is decelerated, and is dispersed to the surroundings to change the flow direction. Since the expansion chamber 4 is elongated in the gas flow direction, the high temperature gas dispersed on both sides flows in the longitudinal direction in the hollow chamber and collides with both ends to change the direction by 180 degrees. The high-temperature gas that changes its direction by 180 degrees and flows back in the longitudinal direction of the hollow chamber collides with the high-temperature gas flowing toward both ends, is mixed, and is discharged from the discharge port 6. The expansion chamber 4 changes direction and decelerates by colliding the high temperature gas with the inner surface, mixes with the air in the expansion chamber 4 to lower the temperature, and further flows into the expansion chamber 4 through the throttle opening 5. When it expands, it lowers the temperature.

The discharge duct shown in the cross-sectional view of FIGS. 4 to 6 includes first to third expansion chambers 4 for lowering the temperature of the high temperature gas according to the operating principle of FIGS. 2 and 3. This discharge duct is connected to the exhaust valve 2 of the secondary battery 1 (indicated by a circular chain wire), and the gas discharged from the exhaust valve 2 that opens is discharged to the outside. Since the exhaust valve 2 is opened in a state where the internal pressure exceeds the threshold pressure, the battery is in an abnormal usage environment in this state, and high-temperature gas is vigorously injected from the exhaust valve 2.

The discharge duct 3 shown in these figures includes a plurality of expansion chambers 4 and a plurality of throttle openings 5. In the discharge duct 3, the discharge port 6 of the expansion chamber 4 on the leeward side and the inflow port 7 of the expansion chamber 4 on the leeward side are connected via the throttle opening 5, and the expansion chamber 4 and the throttle opening 5 are connected in series with each other. Is connected to. The exhaust duct 3 alternately passes the plurality of expansion chambers 4 and the throttle openings 5 to lower the temperature of the high-temperature gas ejected from the exhaust valve 2 to be opened, and safely discharges the gas to the outside.

The expansion chamber 4 has a closed structure and is hollow, and is provided with an inlet 7 and an outlet 6 for high-temperature gas. The inflow port 7 and the discharge port 6 are arranged at positions that do not face each other, that is, at positions that do not face each other. The reason why the inflow port 7 and the discharge port 6 are arranged at non-opposing positions is to prevent the high temperature gas flowing from the inflow port 7 into the expansion chamber 4 from being discharged straight from the discharge port 6. If the high-temperature gas flowing in from the inflow port 7 is discharged straight from the discharge port 6, the temperature is not lowered and the high-temperature gas is vigorously discharged as high-temperature gas, and safety cannot be ensured.

The discharge ducts of FIGS. 4 to 6 include a first expansion chamber 4-1 which is an elongated expansion chamber 4, a second expansion chamber 4-2 having a wide rectangular shape, and a third expansion chamber 4-3. It is connected in series. The first to third expansion chambers 4 are connected in series by the first and second throttle openings 5. The first expansion chamber 4-1 is connected to the second expansion chamber 4-2 via the first aperture opening 5-1 and the second expansion chamber 4-2 has a second aperture opening 5-2. It is connected to the third expansion chamber 4-3 via.

In the discharge duct 3 shown in the figure, the first expansion chamber 4-1 and the second expansion chamber 4-2 are arranged adjacent to each other in a parallel posture, and the second expansion chamber 4-2 is a flow of high temperature gas. The direction is from left to right in the figure, and the third expansion chamber 4-3 has the flow direction of the high temperature gas from bottom to top. Therefore, the second expansion chamber 4-2 and the third expansion chamber 4-3 are oriented so as to intersect each other at right angles with the flow direction of the high temperature gas as the horizontal direction.

Exhaust valves 2 of a large number of secondary batteries 1 are connected to the first expansion chamber 4-1. Since the secondary battery 1 is a cylindrical battery and the exhaust valve 2 is provided on the bottom surface of the outer can, the bottom surface of the outer can is connected to the connection openings 8 provided on both sides of the first expansion chamber 4-1. .. The first expansion chamber 4-1 has a square tubular shape, and is provided with a plurality of connecting openings 8 arranged in the longitudinal direction on both side surfaces in the drawing. The high-temperature gas flowing from the connecting opening 8 into the first expansion chamber 4-1 flows in the direction of flow of the high-temperature gas in the expansion chamber 4, that is, in the direction intersecting the longitudinal direction of the expansion chamber 4. The first expansion chamber 4-1 is connected to the exhaust valves 2 of a plurality of secondary batteries 1 on both sides, but the high temperature gas does not flow in from all the secondary batteries 1 at the same time. Since the exhaust valve 2 is opened only when the internal pressure of the outer can exceeds the threshold pressure, the internal pressures of all the secondary batteries 1 do not exceed the threshold pressure at the same time, and the internal pressure of any of the secondary batteries 1 This is because the exhaust valve 2 opens with a very low probability, that is, with a very low probability that most power supply devices do not open at all during the entire period of use.

When the exhaust valve 2 of the secondary battery 1 whose internal pressure exceeds the threshold pressure is opened, the high-temperature gas injected from the opened exhaust valve 2 flows into the first expansion chamber 4-1 through the connecting opening 8. .. Since the direction of the first expansion chamber 4-1 is different between the inflow direction of the high temperature gas (the direction intersecting the longitudinal direction) and the internal flow direction (the longitudinal direction of the expansion chamber 4), any of the connecting openings 8 The hot gas flowing in from the surface collides with the inner surface on the opposite side and changes direction.

The first expansion chamber 4-1 is provided with a discharge port 6 at an intermediate portion inwardly separated from both end faces of the hollow chamber facing each other. Since the first expansion chamber 4-1 in the figure is provided with connecting openings 8 on both sides and a discharge port 6 on the bottom surface, the high temperature gas flowing in from the connecting opening 8 is reflected by the facing surface in the direction. After being converted, flowing in the longitudinal direction and diffusing, it is discharged from the first throttle opening 5-1 which is the discharge port 6 on the bottom surface. The hot gas flows into the first expansion chamber 4-1 through any one of the connecting openings 8. This is because the exhaust valves 2 of all the secondary batteries 1 are not opened at the same time, but the exhaust valves 2 of any one of the secondary batteries 1 are opened.

Since the first throttle opening 5-1 serves as the discharge port 6 of the first expansion chamber 4-1 and the inflow port 7 of the second expansion chamber 4-2, the first throttle opening 5-1 is The high temperature gas is discharged downward from the first expansion chamber 4-1 and flows into the second expansion chamber 4-2.

The second expansion chamber 4-2 is arranged adjacently below the first expansion chamber 4-1 in the figure and is connected to the first expansion chamber 4-1 via the first throttle opening 5-1. Will be done. The first throttle opening 5-1 is a through hole penetrating the partition wall between the first expansion chamber 4-1 and the second expansion chamber 4-2. In the discharge duct 3 in the figure, the first throttle opening 5-1 is used as a plurality of through holes, and the plurality of through holes are arranged apart from each other. The structure in which a plurality of through holes are connected to the first expansion chamber 4-1 reduces the throttle opening 5 of one of the through holes and allows the high temperature gas of the first expansion chamber 4-1 to be transferred to the second expansion chamber 4. Even if the exhaust valve 2 of any of the secondary batteries 1 that can flow into -2 and is connected to the first expansion chamber 4-1 is opened, the high temperature gas is equalized and the high temperature gas is equalized to the first expansion chamber 4 It has the characteristic that it can flow from -1 to the second expansion chamber 4-2. However, the first aperture opening can also be realized with one through hole.

The second expansion chamber 4-2 has a hollow shape elongated in the flow direction of the high temperature gas, and has a closed square cylinder shape with both ends closed. The second expansion chamber 4-2 shown in the figure has a wider width than the first expansion chamber 4-1 and a larger internal volume than the first expansion chamber 4-1. The wide second expansion chamber 4-2 is arranged below the secondary battery 1 connected to both sides of the first expansion chamber 4-1 so as to have a width that does not protrude outward from the secondary battery 1. , The internal volume is increased.

The second expansion chamber 4-2 having a large internal volume can more effectively increase the temperature drop due to expansion of the high temperature gas flowing in from the throttle opening 5. In particular, in the discharge duct 3 in the figure, since the throttle opening 5 of the inflow port 7 of the second expansion chamber 4-2 is made into a plurality of small through holes, the first expansion chamber 4-1 to the second expansion chamber 4 There is a feature that the expansion when flowing into -2 can be made more efficient, and the temperature of the high temperature gas can be lowered by the expansion.

Further, the second expansion chamber 4-2 has a length of projecting outward from one end (right end in the drawing) of the first expansion chamber 4-1 and a third expansion chamber 4-3 above the protruding portion 9. Is placed. The discharge duct 3 having this structure has a third expansion chamber 4-3 arranged on the protrusion 9 of the second expansion chamber 4-2, and has a width equal to that of the second expansion chamber 4-2. Since the height is equal to that of the first expansion chamber 4-1 it is possible to provide a large volume of the first to third expansion chambers 4-3 with high space efficiency without providing wasted space.

The partition wall between the second expansion chamber 4-2 and the third expansion chamber 4-3 is provided with a second throttle opening 5-2 to form a second expansion chamber 4-2. It is connected to the expansion chamber 4-3 of 3. The second throttle opening 5-2 serves as an outlet 6 of the second expansion chamber 4-2 and an inflow port 7 of the third expansion chamber 4-3. The second throttle opening 5-2 can also efficiently lower the temperature of the high-temperature gas due to expansion as a plurality of small through holes. However, the second diaphragm opening can also be a single through hole.

The third expansion chamber 4-3 passes through the second throttle opening 5-2 to allow hot gas to flow in from bottom to top. The high temperature gas flowing in the vertical direction is discharged to the outside through the third throttle opening 5-3 provided on the side surface.

In the above discharge duct 3, the first expansion chamber 4-1 and the second expansion chamber 4-2 are arranged adjacent to each other in a parallel posture, and the second expansion chamber 4-2 and the third expansion chamber 4-2 are arranged adjacent to each other. 4-3 is arranged in a posture in which the planes including the flow direction of the high temperature gas are parallel to each other, and the high temperature gas flows in the direction perpendicular to each other.

In the discharge duct 3 of FIG. 6, the first throttle opening 5-1 is connected to the third expansion chamber 4-3 by a thin tube 10. One end of the thin tube 10 is connected to the first throttle opening 5-1 and the other end is connected to the third expansion chamber 4-3, which is the expansion chamber 4 on the leeward side. The first throttle opening 5-1 is a Venturi tube having a narrowed middle in order to increase the flow velocity in the middle, and the thin tube 10 is connected to the constricted portion of the Venturi tube. The thin tube 10 is a negative pressure generated by high-temperature gas flowing through the Venturi tube at high speed, and sucks air and gas in the third expansion chamber 4-3, which is the expansion chamber 4 on the leeward side, to draw the first throttle. Circulate through opening 5-1.

Since the thin tube 10 absorbs the air in the third expansion chamber 4-3 and circulates it in the first throttle opening 5-1, it is inside the third expansion chamber 4-3 and the second expansion chamber 4-2. Is absorbed by the first throttle opening 5-1 and mixed with the high temperature gas flowing into the first expansion chamber 4-1 to the second expansion chamber 4-2. Therefore, the high temperature gas passing through the first throttle opening 5-1 is mixed with the air sucked by the thin tube 10, the temperature is lowered, and the high temperature gas flows into the second expansion chamber 4-2. The thin tube 10 circulates air and gas through the third expansion chamber 4-3, the second expansion chamber 4-2, and the first throttle opening 5-1. The circulating gas is the first expansion chamber 4 Since the temperature is lower than the high temperature gas discharged from -1, the high temperature gas discharged from the first expansion chamber 4-1 is supplied from the thin tube 10 when passing through the first throttle opening 5-1. The air is mixed, the temperature is lowered, and the air flows into the second expansion chamber 4-2.

In the discharge duct 3 of FIG. 7, the thin tube 10 connected to the Venturi tube of the first throttle opening 5-1 is connected to the second expansion chamber 4-2. The thin tube 10 sucks air and gas in the second expansion chamber 4-2, which is the expansion chamber 4 on the leeward side, with a negative pressure generated by high-temperature gas flowing through the Venturi tube at high speed, and the first It is circulated in the aperture opening 5-1. Therefore, the thin tube 10 absorbs the air in the second expansion chamber 4-2 and mixes it with the high temperature gas flowing from the first expansion chamber 4-1 into the second expansion chamber 4-2. The temperature of the high temperature gas passing through the throttle opening 5-1 of 1 is lowered and flows into the second expansion chamber 4-2. The discharge duct 3 circulates air and gas through the second expansion chamber 4-2 and the first throttle opening 5-1 by the thin tube 10, and the circulating gas is the first expansion chamber 4-1. The temperature of the high-temperature gas passing through the first throttle opening 5-1 is lower than that of the high-temperature gas discharged from the thin tube 10, and the air supplied from the thin tube 10 is mixed to lower the temperature, and the temperature of the high-temperature gas drops to the second expansion chamber 4-2. Inflow to.

Therefore, the exhaust ducts 3 of FIGS. 6 and 7 can discharge the high-temperature gas discharged from the exhaust valve 2 that opens at a lower temperature. This is because the thin tube 10 circulates the air in the expansion chamber 4 on the leeward side to the throttle opening 5 and effectively agitates and discharges the high temperature gas into the air in the expansion chamber 4. In particular, since the thin tube 10 flows the air in the expansion chamber 4 on the discharge side into the throttle opening 5 and mixes it with the high temperature gas and discharges it to the expansion chamber 4, the air in the expansion chamber 4 on the leeward side with a low temperature is heated to a high temperature. By mixing with the gas, the high temperature gas can be discharged at a lower temperature. Further, the discharge duct 3 may be configured to include both the thin tube 10 of FIG. 6 and the thin tube 10 of FIG. 7.

The power supply device of the present invention can be effectively used as a high-power power supply device including a large number of secondary batteries 1. In particular, it can be effectively used for high-output, large-capacity power supply devices while achieving high safety.

It is a perspective view of the power-source device which concerns on embodiment of this invention. It is sectional drawing which shows the state which a gas flows through an expansion chamber. It is sectional drawing which shows the state which a gas flows through an expansion chamber. It is sectional drawing which shows the discharge duct of the power-source device shown in FIG. It is a top view of the power supply device shown in FIG. It is sectional drawing which shows the other embodiment of a discharge duct. It is sectional drawing which shows the other embodiment of a discharge duct. It is a graph which shows the time-temperature characteristic of the gas discharged from the exhaust valve of the battery which opens.

1 ... Secondary battery 2 ... Exhaust valve 3 ... Exhaust duct 4 ... Expansion chamber 4-1 ... First expansion chamber
4-2 ... Second expansion chamber
4-3 ... Third expansion chamber 5 ... Aperture opening 5-1 ... First aperture opening
5-2 ... Second aperture opening
5-3 ... Third throttle opening 6 ... Discharge port 7 ... Inflow port 8 ... Connecting opening 9 ... Protruding part 10 ... Thin tube

Claims (5)

A secondary battery having an exhaust valve that opens when the pressure rises above the threshold pressure and discharges gas.
A power supply device including an exhaust duct into which gas discharged from the exhaust valve of the secondary battery flows in.
The discharge duct has a plurality of expansion chambers and a plurality of throttle openings.
The outlet of the expansion chamber on the windward side and the inflow port of the expansion chamber on the leeward side are connected via the throttle opening, and the expansion chamber and the throttle opening are connected in series with each other.
The gas ejected from the exhaust valve to be opened is discharged by alternately passing through the expansion chamber and the throttle opening.
The plurality of expansion chambers have an elongated hollow shape having both ends closed, and the inflow port and the outlet are provided at non-opposing positions on the side surfaces of the expansion chamber.
The plurality of expansion chambers
A first expansion chamber connected to the exhaust valve of the secondary battery,
A second expansion chamber connected to the first expansion chamber via the aperture opening, and a second expansion chamber.
A third expansion chamber connected to the second expansion chamber via the throttle opening, and a third expansion chamber.
Includes
The first expansion chamber and the second expansion chamber are arranged adjacent to each other in a posture parallel to each other, and the second expansion chamber has a protrusion protruding from the first expansion chamber.
A power supply device characterized in that the third expansion chamber is arranged adjacent to a protruding portion surface of the second expansion chamber and an end portion of the first expansion chamber. The power supply device according to claim 1.
A power supply device characterized in that the inflow port connecting the exhaust valves of the secondary battery is opened so as to be arranged in the longitudinal direction of the first expansion chamber. The power supply device according to claim 1 or 2.
It has a thin tube with one end connected to the throttle opening and the other end connected to the expansion chamber on the leeward side, and the gas discharged from the exhaust valve that opens is a negative pressure that flows through the throttle opening at high speed. A power supply device characterized in that the thin tube circulates gas in an expansion chamber on the leeward side to a throttle opening. The power supply device according to any one of claims 1 to 3.
A power supply device characterized in that the secondary battery serves as a non-aqueous electrolyte secondary battery. The power supply device according to any one of claims 1 to 4.
A power supply device characterized in that the internal volume of the expansion chamber is larger than the internal volume of the secondary battery.

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