JP2021099937A - Battery pack - Google Patents

Abstract

To provide a battery pack which can uniformize, without using a heat insulator, the temperature inside the battery pack housing a plurality of batteries.SOLUTION: A battery pack 1 comprises: a plurality of batteries 11; and a housing 12 which houses the batteries 11 in such a manner that they are aligned with spaces provided therebetween, and which has an inlet port 13 for a cooling medium and an outlet port 14 for discharging the cooling medium that has been sucked from the inlet port 13 and has passed through the spaces between the batteries 11. The inlet port 13 is provided at a position on one end side of a surface 12c of the housing 12, and an inlet passage is formed toward a facing surface 12e opposite to the surface 12c. On a portion of an inner wall which defines the inlet passage in the housing 12 extending from the inlet port 13 to the facing surface 12e, the housing 12 has a narrowing part 15 which narrows the cross-sectional shape of the inlet passage. The narrowing part 15 is provide so as to partially vary the height of the inner wall.SELECTED DRAWING: Figure 1

Description

The present invention relates to a battery pack.

Currently, electric vehicles, hybrid vehicles, plug-in hybrid vehicles, and the like are equipped with a battery pack containing a secondary battery such as a lithium ion secondary battery or a nickel hydrogen battery. Such a battery pack (battery pack) can be configured by arranging a plurality of secondary batteries (battery modules) in a housing having an intake port and an exhaust port.

Patent Document 1 describes a first battery cell, a second battery cell, a first duct having an inlet at the first end and a slope at the second end opposite the first end. The main body and the battery pack with are listed. The main body surrounds the first battery cell and the second battery cell, and is connected to the first duct. Here, the slope has a first frame and a second frame opposite to the first frame, the first frame of the slope is close to the battery cell, and the slope is the second frame of the slope. It is tilted so that it is closer to the entrance than the first frame. It also includes a gap formed between the first battery cell and the second battery cell that provides a passage for the heat transfer medium to flow from the first duct between the first battery cell and the second battery cell. Is formed of. Further, the first battery cell and the second battery cell are stacked in the first direction. Further, the first duct includes an oblique side surface. Each of the oblique side surfaces has a first frame extended in the first direction and a second frame extended in the first direction, and the first frame on the oblique side surface is adjacent to the battery cell. Further, the oblique side surfaces are inclined to each other so that the second frame of the oblique side surface is closer to the space between the first frames.

Japanese Unexamined Patent Publication No. 2012-18910

By the way, the variation in the cooling air temperature flowing in the flow path between the built-in batteries (battery modules) in the battery pack is one of the major causes of the variation in the temperature between the battery modules. The variation in the cooling air temperature is caused in part by the fact that the air that receives heat from the outside and the air that does not receive heat flows through the flow paths between different battery modules. In particular, the wind that flows in contact with the wall on the intake flow path side of the housing always collects heat from the outside (external environment) such as outside air, so the temperature rises, and the wind flows into the flow path between battery modules in one place. The temperature of the battery module in the vicinity becomes high.

Further, it is conceivable to insulate the housing as a measure against heat reception from the outside, but since the heat receiving surface in the housing is wide, the cost increases.

The battery pack described in Patent Document 1 is intended to reduce the temperature deviation between stacked battery cells, but does not take into consideration the heat reception from the outside as described above.

The present invention has been made to solve such a problem, and provides a battery pack capable of equalizing the temperature in a battery pack containing a plurality of batteries without using a heat insulating material. The purpose is to do.

The battery pack according to one aspect of the present invention accommodates a plurality of batteries and the plurality of batteries in an arranged state with a space between the batteries, and is sucked from the intake port of the cooling medium and the intake port. A housing having an exhaust port for exhausting a cooling medium that has passed through a space between batteries is provided, and the intake port is provided at a position on one end side of one surface of the housing. A throttle portion for narrowing the cross-sectional shape of the intake flow path is provided in a part of an inner wall forming an intake flow path from the intake port in the housing to the facing surface facing the one surface, and the throttle portion is It is provided so that the heights of the inner walls are partially different.

Further, it is preferable that the throttle portion is arranged in a region where the cooling medium taken in from one end side of the intake port and the cooling medium taken in from the other end side of the intake port interfere with each other. Here, it is assumed that the cooling medium is sucked so that the amount of the cooling medium taken in from one end side of the intake port is larger than that of the cooling medium taken in from the other end side of the intake port.

Further, it is preferable that the throttle portion is provided so that the entire inner wall is raised and the height thereof is different at a plurality of places.
Further, it is preferable that the throttle portion is provided so that the difference in height of the inner wall is evenly distributed at the plurality of locations.

Further, the throttle portion may be provided so that the height of the inner wall is increased by one place.

Further, it is preferable that the throttle portion is provided so that the height of the inner wall is partially different in the direction perpendicular to the arrangement direction of the plurality of batteries.
Further, it is preferable that the battery pack further includes a throttle changing mechanism for changing the cross-sectional shape of the intake flow path in the throttle portion.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a battery pack capable of equalizing the temperature in a battery pack containing a plurality of batteries without using a heat insulating material.

It is a vertical sectional view which shows one structural example of the battery pack which concerns on Embodiment 1. FIG. It is an enlarged view of a part of the battery pack of FIG. It is a horizontal sectional view of the battery pack of FIG. It is a vertical cross-sectional view which shows the battery pack which concerns on a comparative example. It is an enlarged view of a part of the battery pack of FIG. It is a horizontal sectional view of the battery pack of FIG. It is a figure which shows the example of the temperature of the intake chamber of each row in the battery pack of FIGS. 1 to 3. It is a figure which shows the example of the temperature of the intake chamber of each row in the battery pack of FIGS. 4 to 6. It is a vertical sectional view which shows one structural example of the battery pack which concerns on Embodiment 2. FIG. FIG. 9 is a view of a part of the battery pack of FIG. 9 as viewed from the XX direction. 9 is a horizontal cross-sectional view of the battery pack of FIG. It is a vertical sectional view which shows one structural example of the battery pack which concerns on Embodiment 3. FIG.

Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings. However, the present invention is not limited to the following embodiments. Further, in order to clarify the explanation, the following description and drawings have been simplified as appropriate. Further, in the embodiment, the same or equivalent elements may be designated by the same reference numerals, and duplicate description may be omitted as appropriate.

(Embodiment 1)
The first embodiment will be described with reference to FIGS. 1 to 8. FIG. 1 is a vertical cross-sectional view showing a configuration example of a battery pack according to the first embodiment. FIG. 2 is an enlarged view of a part of the battery pack of FIG. 1, and FIG. 3 is a horizontal cross-sectional view of the battery pack of FIG. In addition, in FIGS. 1 to 3 and each figure described later, the solid line arrow indicating the flow of the cooling medium indicates that the thicker the wind is, the hotter the wind is. The cross section of II-II in FIG. 3 is shown in FIG.

As shown in FIG. 1, the battery pack 1 according to the present embodiment includes a plurality of batteries 11 and a housing 12. The battery 11 is a secondary battery. In FIG. 1, the plurality of batteries 11 are arranged from the one side 12c side of the housing 12 toward the facing surface 12f.

Here, an example in which nine batteries are housed in the battery pack 1 (an example in which nine battery 11 cooling media are tacked) will be given, but the number of batteries 11 may be plural. Further, a plurality of cells can be arranged inside the battery 11 in the direction perpendicular to the paper surface of FIG. Each cell may contain one or a plurality of sets (electrode groups) including a positive electrode sheet, a negative electrode sheet, and a separator. It does not matter whether the number of cells or the width is different.

The housing 12 accommodates a plurality of batteries 11 in a state of being arranged with a space between the batteries 11, and has an intake port 13 and an exhaust port 14 of a cooling medium. The space serves as a cooling medium flow path between the batteries 11.

The intake port 13 is provided at a position on one end side of one surface 12c of the housing 12 (a position corresponding to the vicinity of the lower end portion 12b of the housing 12), and the intake flow path (intake chamber) is directed toward the facing surface 12e. ) Is formed. Further, the exhaust port 14 exhausts the cooling medium that is taken in from the intake port 13 and passes through the space between the batteries 11. As shown in the drawing, the exhaust port 14 can be provided at a position other than the one end side position on the one surface 12c (a position corresponding to the vicinity of the upper end portion 12a of the housing 12). An exhaust flow path (exhaust chamber) is formed from the facing surface 12d of the exhaust port 14 in this example. However, the exhaust port may be provided at a position other than the position facing the intake port 13 (that is, the position of the facing surface 12e) on the facing surface 12f facing the one surface 12c. For example, the exhaust port may be provided at the position shown as the facing surface 12d in FIG.

Cold air is blown to the intake chamber from the external environment such as outside air and other parts, and the intake chamber can function as a cooling chamber. Since the temperature of the external environment is higher than that of the cooling medium taken into the intake chamber, the cooling medium inside the intake chamber receives heat from the external environment as shown by the dotted arrow in FIG. As a result, as shown by the thickness of the solid arrow in FIG. 1, the closer to the outside of the housing 12, the higher the temperature. Further, it can be said that the temperature rises because the amount of heat received increases toward the facing surface 12e from the intake port 13.

In order to eliminate such temperature variation, the housing 12 has a cross section of the intake flow path on a part of the inner wall forming the intake flow path from the intake port 13 to the facing surface 12e in the housing 12. It has a throttle portion (cross-section throttle portion) 15 that narrows the shape. The throttle portion 15 can also be referred to as an orifice.

Then, the throttle portion 15 partially differs in the height of the inner wall in the direction perpendicular to the arrangement direction of the plurality of batteries 11 (the direction perpendicular to the intake flow path), that is, in the direction perpendicular to the paper surface of FIG. It is provided in. This means that the throttle portion 15 is provided so that the heights of the inner walls are partially different in the direction perpendicular to the arrangement direction of the plurality of batteries 11 and in the direction along the inner wall surface. Note that FIG. 1 shows an example in which a concave portion is formed on the outside of the lower end portion 12b of the housing 12 when the diaphragm portion 15 is provided, but the throttle portion 15 has a flat shape on the outside of the lower end portion 12b of the housing 12. It can also be provided so as to be.

In particular, in the example of FIG. 1, the throttle portion 15 is provided so that FIG. 3 shows a horizontal cross section of the battery pack 1 (a cross section in the height direction near the intake port 13). That is, the throttle portion 15 is provided so that the height of the inner wall is increased by one in the direction perpendicular to the paper surface in FIG. 1 (the direction perpendicular to the battery arrangement direction on the paper surface in FIG. 3).

Further, FIG. 1 gives an example in which the vertical cross-sectional shape of the throttle portion 15 is trapezoidal, and the intake flow path is narrowed and agitated in the region P. However, the vertical cross-sectional shape of the throttle portion 15 is not limited to this, and the cooling medium is agitated by peeling off the cooling medium from the intake port 13 to form a vortex, and the nearby flow becomes turbulent. Any shape may be used.

In the battery pack 1, the air intake of the cooling medium is increased so that the cooling medium taken in from one end 13a side of the intake port 13 is larger than the cooling medium taken in from the other end 13b side of the intake port 13 by a blowing mechanism such as a blower (not shown). May be configured to be done. That is, a ventilation mechanism for the battery pack 1 may be installed so that the flow in the intake chamber is uneven in the direction perpendicular to the battery arrangement direction. This is because the blower port of the blower mechanism is often made smaller than the intake port 13, and the cooling medium may be blown toward either of them due to restrictions on the arrangement of the blower mechanism and the like. The cooling medium blown by the blowing mechanism is generally air, but the cooling medium is not limited to this.

In order to compensate for the uneven flow as described above, the throttle portion 15 takes in air from the cooling medium taken in from one end 13a side of the intake port 13 and the other end 13b side of the intake port 13, as shown in FIG. It is preferably arranged in the region Q where the cooling medium is interfered with. This region Q is a portion (range) in which it is particularly desirable to equalize the temperatures, and by disposing the throttle portion 15 in this region, cooling media having a larger temperature difference are agitated. The temperature can be equalized and flowed through the flow path between the batteries 11. The position and size of this region vary depending on the design requirements of the battery pack 1 (for example, the number of batteries, the size of the space between batteries, etc.).

Further, the throttle portion 15 is shifted to the intake port 13 side from the region Q where the forward headwinds interfere with each other shown in FIGS. 1 and 2, for example, by about the width of 1 to 3 batteries 11, so that the throttle portion 15 is exactly around the region Q. It can be most agitated.

In order to explain the effect of this embodiment, the configuration of the battery pack according to the comparative example shown in FIGS. 4 to 6 will be described. FIG. 4 is a vertical cross-sectional view showing a battery pack according to a comparative example, FIG. 5 is an enlarged view of a part of the battery pack of FIG. 4, and FIG. 6 is a horizontal cross-sectional view of the battery pack of FIG. Here, the VV cross section of FIG. 3 is shown in FIG.

The battery pack 100 according to the comparative example is the battery pack 1 of FIG. 1 excluding the diaphragm portion 15, and the components of the battery pack 100 are each of the battery packs 1 of FIG. 1 although the description thereof will be omitted. The figure is shown using a code obtained by counting 100 as the code of the component.

In the battery pack 100, the temperature rises on the right side of the alternate long and short dash line in FIG. 5, as shown by the alternate long and short dash line in FIG. Then, even in the flow path between the batteries 111 into which the cooling medium flows, the temperature becomes higher than the flow path between the other batteries 111, and the temperature is not made uniform.

This is due to the following reasons. That is, in the battery pack 100, the temperature is highest in the region R as shown in FIG. 6 due to the relationship between the angle of the intake port 113 with respect to the air outlet of the air blower mechanism and the like. Specifically, the flow velocity of the cooling medium flowing in from one end side 113a of the intake port 113 is stronger than the flow velocity of the cooling medium flowing in from the other end side 113b, and the former cooling medium wraps around through the facing surface 112e. come. Further, since the cooling medium that wraps around goes through a longer path, the amount of heat received from the battery 111 that generates heat increases, resulting in a high temperature. Therefore, the temperature is highest in the region R of FIG. 6 (particularly on the facing surface 112e side).

FIG. 7 is a diagram showing an example of the temperature of the intake chamber in each row in the battery packs of FIGS. 1 to 3, and FIG. 8 is an example of the temperature of the intake chamber in each row in the battery packs of FIGS. 4 to 6. It is a figure which shows. Further, in FIGS. 7 and 8, the temperature values of the flow paths in the vicinity where the throttle portion 15 is provided and corresponding to each cell are shown, and examples of the temperature values under the same conditions except for the presence or absence of the throttle portion. Is shown. Here, an example in which six cells having the same width are arranged inside the battery will be given. The module numbers on the horizontal axis shown in FIGS. 7 and 8 correspond to the numbers of the battery 11 and the battery 111, respectively, and as shown in the figure, are compared with FIGS. 1 to 3 and 4 to 6, respectively. It shows the temperature value when many batteries are arranged.

The first column (lowermost cell in FIG. 3) shown in FIG. 7 is as follows as compared with the first column (lowermost cell in FIG. 6) shown in FIG. That is, in the first row of FIG. 7, the temperature of the intake chamber (here, the flow path between the batteries) is lower than that of the first row of FIG. It can be seen that the temperature distribution is more uniform than the temperature distribution in FIG.

In the present embodiment, the diaphragm portion 15 is provided in the housing 12 of the battery pack 1, and the air is agitated by intersecting the flows of the wind that receives heat and the wind that does not receive heat (cooling air in front of the throttle portion 15). Further, in the present embodiment, for example, due to the arrangement of the intake port 13 with respect to the ventilation mechanism, the wind flowing back along the lower end portion 12b in the region behind the throttle portion 15 (region Q in FIG. 3) when viewed from the intake port 13. Is being generated. Then, in the present embodiment, the heat receiving energy is brought to the upper side on the right end side of the throttle portion 15, and the wind that brings this heat receiving energy to the upper side and the wind that enters the throttle portion 15 from the intake port 13 are agitated. Can be done. As a result, in the present embodiment, as shown in the example of FIG. 7, the temperature can be equalized.

Further, in the present embodiment, the temperature variation due to heat reception can be suppressed without using a heat insulating material, so that the cost can be suppressed. However, although the heat insulating material can be used in this embodiment as well, the quantity and quality of the heat insulating material can be reduced as compared with the case where the heat insulating material is used in the comparative example.

As described above, according to the battery pack 1 according to the present embodiment, it is possible to equalize the temperature in the battery pack containing a plurality of batteries without using a heat insulating material, as compared with the comparative example. Become. Further, in a cold region or the like, the external temperature may be lower than the temperature of the cooling medium, but even in that case, heat is dissipated from the cooling medium and the temperature may not be uniform. It can be said that it plays.

Further, in the present embodiment, it is assumed that a plurality of batteries 11 are arranged from the one side 12c side of the housing 12 toward the facing surface 12f as shown in FIG. As a result, the air immediately after being agitated by the throttle portion 15 can flow into the space between the batteries 11. However, even if the plurality of batteries are not arranged in the directions as illustrated, the air agitated by the throttle portion flows into the space between the batteries, so that the effect of the present embodiment can be obtained.

(Embodiment 2)
The second embodiment will be described with reference to FIGS. 9 to 11, but various examples described in the first embodiment can be appropriately used. FIG. 9 is a vertical cross-sectional view showing a configuration example of the battery pack according to the second embodiment. 10 is a view of a part of the battery pack of FIG. 9 as viewed from the XX direction, and FIG. 11 is a horizontal cross-sectional view of the battery pack of FIG.

As shown in FIGS. 9 to 11, the battery pack 2 according to the present embodiment is the battery pack 1 of FIG. 1 and the like in which the throttle portion 25 is provided instead of the throttle portion 15. In the direction perpendicular to the arrangement direction of the plurality of batteries 11, the drawing portion 25 is set so that the entire inner wall is raised in the direction perpendicular to the paper surface of FIG. 9 (the direction perpendicular to the battery arrangement direction on the paper surface in FIG. 11). The height is provided so as to be different in a plurality of places.

Note that FIG. 9 shows an example in which a recess is formed on the outside of the lower end portion 12b of the housing 12 when the diaphragm portion 25 is provided, but the throttle portion 25 has a flat surface on the outside of the lower end portion 12b of the housing 12. It can also be provided so as to be. Further, the other components of the battery pack 2 are as described for the battery pack 1.

As an example in which the heights are provided at a plurality of locations so as to be different, as shown in FIGS. 10 and 11, the diaphragm portion 25 is lower than the first throttle surface 25a at the first height from the inner wall and the first height. It can be formed so as to have a second drawing surface 25b having a second height. The second drawing surface 25b corresponds to a notch in the drawing section 25.

In particular, the throttle portion 25 in this example is provided so that the difference in height of the inner wall is evenly distributed at the plurality of locations in the direction perpendicular to the arrangement direction of the plurality of batteries. The even distribution can mean that the height is set symmetrically with respect to the center of the entire inner wall to be raised. Although the example in which the height of two steps is adopted is shown here, the height may be three or more steps, or the height may be changed in a curved shape.

Due to such a change in the cross-sectional area of the flow path, the air volume distribution is large in the portion of the second throttle surface 25b and small in the portion of the first throttle surface 25a. Then, the wind having a large amount of air passing through the second throttle surface 25b swirls from the position of the throttle portion at the back end (opposing surface 12e in FIGS. 9 and 11), and the heat receiving energy is transferred to the portion of the first throttle surface 25a (stirring). It will be carried to the part). The cooling medium is agitated in this agitated portion, and the air agitated so as to have the same temperature flows through the flow path between the batteries 11 to cool the batteries 11 and make the temperature of each battery 11 uniform.

The second throttle surface 25b having such a low height can function as a rectifying unit that rectifies the wind so as to adjust the air volume distribution, thereby forming a flow of the cooling medium as shown by the arrow in FIG. can do. The battery pack 2 has a function of rectifying and temperature equalizing the throttle portion 25 mainly by a rectifying function mainly performed by the second throttle surface 25b and a stirring function (temperature equalizing function) mainly performed by the first throttle surface 25a. Can be configured to have.

Therefore, in the present embodiment, when the range in which stirring by the throttle portion is required is wide (when the temperature is desired to be significantly lowered), or when the distance from the position of the throttle portion to the back end (opposing surface 12e in FIGS. 9 and 11) is large. This is useful when the cooling medium that has received heat cannot be collected far away to the throttle portion. In other words, the position of the second throttle surface 25b may be set according to the air volume distribution before entering the throttle portion 25, that is, it may be set in the portion having a large air volume. Further, when the position of the throttle portion 25 is close to the back end or the air volume distribution in the width direction is uniform, a cutout portion such as the second throttle surface 25b is not provided, and the throttle portion has a constant height. Just leave it. In addition, in the present embodiment, when a plurality of cells are built in the battery 11, the height of the aperture may be made different corresponding to each cell.

As described above, according to the battery pack 2 according to the present embodiment, by providing the rectifying function, the cooling medium can be agitated more efficiently in addition to the effect of the first embodiment. Therefore, according to the battery pack 2 according to the present embodiment, the temperature variation can be further eliminated, or the temperature variation can be eliminated even if the design is such that it is difficult to stir. In particular, the battery pack 2 according to the second embodiment is effective when the distance from the throttle portion 25 to the facing surface 12e is long and the cooling medium does not bounce back to the throttle portion 25. Although it is different from the example in which the entire inner wall is raised, a modified example in which the height of the second drawing surface 25b with respect to the inner wall is set to zero can also be adopted.

(Embodiment 3)
Although the third embodiment will be described with reference to FIG. 12, various examples described in the first and second embodiments can be appropriately used. FIG. 12 is a vertical cross-sectional view showing a configuration example of the battery pack according to the third embodiment.

As shown in FIG. 12, the battery pack 3 according to the present embodiment is provided with the throttle portion 35 instead of the throttle portion 15 or the throttle portion 25 in the battery pack 1 of FIG. 1 or the like or the battery pack 2 of FIG. 9 or the like. It is a thing. The height of the inner wall of the drawing portion 35 can be changed in the direction perpendicular to the arrangement direction of the plurality of batteries 11 and in the direction perpendicular to the paper surface of FIG. 9 (the direction perpendicular to the battery arrangement direction on the paper surface in FIG. 11). ing. That is, the battery pack 3 includes a diaphragm changing mechanism for changing the cross-sectional shape of the intake flow path in the diaphragm portion 35.

The diaphragm portion 35 illustrated in FIG. 12 is an example in which a diaphragm changing mechanism is provided in itself, and has a diaphragm plate 35a that functions as a diaphragm and a support portion 35b for changing the installation angle of the diaphragm plate 35a. .. The support portion 35b is arranged so that the installation angle can be changed by supporting the throttle plate 35a and moving it along the inner wall of the lower end portion 12b of the housing 12 and in parallel with the intake flow path. ing. However, the configuration of the aperture change mechanism does not matter.

Such an aperture changing mechanism can be adjusted manually, but it can also be configured to be automatically controlled according to input information from a separately provided control unit. The input information includes, for example, the total air volume of cooling by the ventilation mechanism, the air temperature, the angle of the intake port 13 with respect to the air outlet, the measured value of the temperature sensor provided on the inner wall of the lower end portion 12b of the housing 12, and the housing 12. Examples include the measured value (outside air temperature) of the temperature sensor provided on the outside. Of course, the input information that is the source of control may be a combination of these plurality, or may be only one, or may be control information in a device such as an automobile equipped with the battery pack 3. As described above, the input information can be information such that the required height at the diaphragm portion changes.

To give an example of manual adjustment or control, when the air volume is large, manual adjustment or control may be performed so as to lower the height by reducing the angle of the diaphragm plate 35a. Further, when the outside air temperature is high, manual adjustment or control may be performed so as to increase the height by increasing the angle of the diaphragm plate 35a.

The flow in the vicinity of the throttle portion 35 of the battery pack 3 of FIG. 12 can be the same as that of FIG. 2, and the horizontal cross-sectional view of the battery pack 3 of FIG. 12 can be the same as that of FIG. Alternatively, the horizontal cross-sectional view of the battery pack 3 of FIG. 12 can be the same as that of FIG. 11, and the view of a part thereof viewed from the XX direction can be the same as that of FIG. In this case, as described in the example of the second embodiment, the height may be manually adjusted or controllable on both the first diaphragm surface 25a and the second diaphragm surface 25b, or only one of them can be manually adjusted or controlled. You may leave it as.

As described above, according to the battery pack 3 according to the present embodiment, by providing the height changing function, in addition to the effects of the first or second embodiment, the ambient environment, control environment, design, cooling air volume, etc. of the battery pack 3 It is possible to suppress temperature variations in response to various factors such as cooling temperature.

(Other embodiments, etc.)
The present invention is not limited to each of the above embodiments, and can be appropriately modified without departing from the spirit. For example, the shape of the battery pack according to each embodiment is not limited to the example. Further, the holding mechanism for holding each battery in the battery pack does not matter.

1, 2, 3 Battery pack 11 Battery 12 Housing 12a Upper end 12b Lower end 12c One side 12d, 12e, 12f Opposing surface 13 Intake port 13a One end 13b Other end 14 Exhaust port 15, 25, 35 Aperture part 25a First drawing surface 25b Second drawing surface 35a Drawing plate 35b Support part

Claims (7)

With multiple batteries
The plurality of batteries are housed in an arranged state with a space between the batteries, and have an intake port for a cooling medium and an exhaust port for exhausting the cooling medium that is taken in from the intake port and passes through the space between the batteries. With the housing
With
The intake port is provided at a position on one end side of one surface of the housing.
The housing has a throttle portion that narrows the cross-sectional shape of the intake flow path in a part of an inner wall that forms an intake flow path from the intake port in the housing to the facing surface facing the one surface. ,
The throttle portion is provided so that the height of the inner wall is partially different.
Battery pack. The cooling medium is sucked so that the amount of the cooling medium taken in from one end side of the intake port is larger than that of the cooling medium taken in from the other end side of the intake port.
The throttle portion is arranged in a region where the cooling medium taken in from one end side of the intake port and the cooling medium taken in from the other end side of the intake port interfere with each other.
The battery pack according to claim 1. The throttle portion is provided so that the entire inner wall is raised and the height thereof is different at a plurality of places.
The battery pack according to claim 1 or 2. The throttle portion is provided so that the difference in height of the inner wall is evenly distributed at the plurality of locations.
The battery pack according to claim 3. The throttle portion is provided so that the height of the inner wall is increased by one place.
The battery pack according to claim 1 or 2. The throttle portion is provided so that the heights of the inner walls are partially different in a direction perpendicular to the arrangement direction of the plurality of batteries.
The battery pack according to any one of claims 1 to 5. A diaphragm changing mechanism for changing the cross-sectional shape of the intake flow path in the diaphragm portion is further provided.
The battery pack according to any one of claims 1 to 6.

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