JP2013131341A - Battery pack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery pack which efficiently cools modules 3 formed by assembling battery cells and control devices 7, 8 in a case 2 where waterproofness is required.SOLUTION: A battery pack has a case 2 housing multiple modules 3, each of which is formed by assembling battery cells 21, and a suction port 4 is provided in the case 2. Further, the battery pack has a suction chamber 5 allowing the interior and the exterior of the case 2 to communicate, guiding cooling air from the exterior of the case 2 to a bottom part of each module 3. Furthermore, the case 2 has an exhaust port 9 guiding the cooling air passing through gaps between the modules 3 and the case 2 to the exterior of the case 2. In the case 2, control devices 7, 8, which interrupt and supply currents flowing from the modules 3 and control the interruption and the supply, are provided. The control devices 7, 8 are installed on the downstream side of the flow of the cooling air relative to the modules 3.

Description

  The present invention relates to a battery pack having a module incorporating a plurality of battery cells and a control device. In particular, the present invention relates to a battery pack for a vehicle having a waterproof function.

  Conventionally, a power storage device described in Patent Document 1 is known. This is because, in a configuration including a plurality of power storage units, the first and second power storage units are arranged side by side in order to efficiently adjust the temperature of the power storage module in each power storage unit. Each power storage unit was heat-exchanged between a power storage module having a plurality of power storage elements, a supply duct for supplying a heat exchange medium for heat exchange with the power storage elements to the power storage module, and the power storage elements And a discharge duct for discharging the heat exchange medium. And the discharge duct in the 1st and 2nd electrical storage unit is arrange | positioned adjacently.

  Conventionally, a power storage device described in Patent Document 2 is known. This is because a power supply device for a vehicle is used to cool a relay, which is an electronic component having a large amount of heat generation, very efficiently and to cool the relay efficiently while reducing the influence of the cooling of the relay on the cooling of the battery. Includes a battery block that houses a plurality of batteries in a battery case, and an electronic component block that houses electronic parts connected to the battery housed in the battery block in an electronic part case. The electronic component block incorporates a relay that cuts off the battery current of the battery block in the electronic component case. This relay is disposed in an electronic component case in a thermally coupled state via an elastic thermal conductive sheet, and a thermal coupling portion with the relay of the electronic component case is a metal case, and the elastic thermal conductive sheet is used to generate heat from the relay. Through the metal case to dissipate heat to the outside.

JP 2010-33799 A JP 2009-181737 A

  Large battery packs such as plug-in hybrid vehicles (PHV) and electric vehicles (EV) are required to be waterproof because the battery pack is exposed outside the vehicle. However, when the battery pack has a waterproof structure, natural convection is hindered, so that heat radiation from the internal modules and control devices becomes insufficient.

  In this regard, according to the technique disclosed in Patent Document 1, by disposing the devices between the exhaust ducts, the influence of heat on the intake air temperature is avoided, but cooling of the devices is not considered. Further, in Patent Document 2, the heat of the devices is radiated to the pack case via the heat dissipation sheet, but depending on the environment, the temperature in the case rises conversely due to heat from the outside, There is a risk that heat dissipation will be insufficient. Therefore, even in a battery pack that requires waterproofness, a battery pack that can efficiently cool the module and the control device in which the battery cell is built is required.

  The present invention has been made paying attention to such problems existing in the prior art, and its purpose is to provide a battery that can efficiently cool a module in which a battery cell is assembled and a control device. To provide a pack.

  Descriptions of patent documents listed as prior art can be introduced or incorporated by reference as explanations of technical elements described in this specification.

  In order to achieve the above object, the present invention employs the following technical means. That is, in the invention described in claim 1, a module (3) composed of a plurality of battery cells (21), a case (2) for housing the plurality of modules (3), and an intake air provided in the case (2) An intake chamber (5) for communicating cooling air from the outside of the case (2) to the bottom of the module (3) through communication between the inside of the case (2) and the outside via the inlet (4) and the intake port (4) The cooling air that has passed through the gap between the module (3) and the case (2) is led to the outside of the case (2), the exhaust port (9), and provided in the case (2) and flows from the module (3). A control device (7, 8) that cuts off and supplies current, and the control device (7, 8) is installed downstream of the flow of the cooling air from the module (3). Yes.

  According to the present invention, it is possible to reliably cool the control device that generates a large amount of heat while cooling the battery cells in the module. Moreover, since the control device is cooled after the module is cooled first with cooling air, the upper temperature limit of the battery cell can be made lower than the upper temperature limit of the control device. In other words, since the cooling air having a low temperature can be supplied to the battery cell, the temperature of the battery cell can be kept lower than that of the control device.

  In the invention according to claim 2, the control device (7, 8) includes the device section (8) including a switch for cutting off and supplying the current flowing from the module (3), and the voltage or temperature of the battery cell. It consists of the control part (7) to detect, and the apparatus part (8) is arrange | positioned in the downstream of the control part (7), It is characterized by the above-mentioned.

  According to the present invention, since the control unit having a smaller calorific value than the device unit is arranged on the upstream side of the device unit, the device unit is cooled with the cooling air that has cooled the control unit. (Temperature difference ΔT = temperature of each control device−cooling air temperature) can be ensured, and the control unit and the device unit can be reliably cooled.

  In the invention according to claim 3, the control device (7, 8) includes the device section (8) having a built-in switch for cutting off and supplying the current flowing from the module (3), and the voltage or temperature of the battery cell. It comprises a control unit (7) for detection, and is characterized in that the device unit (8) and the control unit (7) are arranged in parallel to the cooling air.

  According to this invention, cooling air can be supplied in parallel to the control unit and the device unit, and the amount of cooling air can be assigned to each of the control unit and the device unit.

  In the invention according to claim 4, the case (2) has an airtight structure that separates the outside of the case (2) from the inside of the case (2) except for the intake port (4) and the exhaust port (9). It is characterized by.

  According to the present invention, it is possible to prevent air existing outside the battery pack from entering the inside of the case or leakage of cooling air to the battery pack to the outside, and to secure the waterproofness of the battery pack. In addition, since the cooling air that has passed through the gap between the module and the case can be guided from the exhaust port to the outside of the case without the exhaust chamber, the case can also serve as the exhaust chamber, and the exhaust chamber is unnecessary. The battery pack can be reduced in size.

  The invention according to claim 5 is characterized in that a suction fan (10) is built in the case (2) communicating with the exhaust port (9) via a fan duct.

  According to this invention, since the suction fan is built in the case, the pressure loss can be reduced and the inside of the case can be cooled compared to the case where the fan is provided outside the case.

  The invention according to claim 6 is characterized in that the intake port (4) and the exhaust port (9) are arranged separately at both ends of the case (2).

  According to the present invention, since the intake port and the exhaust port are separately arranged at both ends of the case, even when cooling air leaks from the intake chamber, the module does not shortcut to the exhaust port from the portion where the cooling air leaks. Can be reliably cooled.

  The invention according to claim 7 is characterized in that both end portions are located above the case (2).

  According to the present invention, since the intake port and the exhaust port are separately disposed at both end portions on the upper side of the case, it is easy to install a duct as a vehicle side component connected to each of the intake port and the exhaust port. In addition, maintenance is easy.

  In addition, the code | symbol in parentheses described in a claim and each said means is an example which shows the correspondence with the specific means as described in embodiment mentioned later easily, and limits the content of invention is not.

It is a top view of the battery pack which shows 1st Embodiment of this invention. FIG. 2 is a schematic layout view inside a battery pack as seen from the direction of arrow Y2 in FIG. 1. FIG. 3 is a schematic layout view of an intake chamber inside the battery pack as viewed from the direction of arrow Y3 in FIG. 1. FIG. 2 is a schematic layout view inside a battery pack as seen from the direction of arrow Y4 in FIG. 1. It is the top view of the module seen from the arrow Y5 direction of FIG. FIG. 6 is a bottom view of the module of FIG. 5. FIG. 6 is an internal schematic view of the module of FIG. 5 with a module cover removed. FIG. 6 is a partially broken cross-sectional view seen from the direction of arrow Y8 in FIG. 5. It is the side view seen from the arrow Y9 direction of FIG. It is a typical layout view inside the battery pack as viewed from the plane direction in the embodiment. FIG. 11 is a schematic layout view inside the battery pack as seen from the direction of arrow Y11 in FIG. 10. FIG. 11 is a schematic layout view inside the battery pack as seen from the direction of arrow Y12 in FIG. 10. FIG. 6 is a schematic layout view inside a battery pack as viewed from a plane direction showing a second embodiment of the present invention. FIG. 14 is a schematic layout view inside the battery pack as seen from the direction of arrow Y14 in FIG. 13. It is a typical layout figure inside a battery pack seen from the plane direction showing a 3rd embodiment of the present invention. FIG. 16 is a schematic layout view inside the battery pack as seen from the direction of arrow Y16 in FIG. 15. FIG. 16 is a schematic layout view inside the battery pack as seen from the direction of arrow Y17 in FIG. 15.

  A plurality of modes for carrying out the present invention will be described below with reference to the drawings. In each embodiment, parts corresponding to the matters described in the preceding embodiment may be denoted by the same reference numerals, and redundant description may be omitted. When only a part of the configuration is described in each mode, the other modes described above can be applied to the other parts of the configuration.

  Not only combinations of parts that clearly indicate that the combination is possible in each embodiment, but also the embodiments are partially combined even if they are not clearly specified unless there is a problem with the combination. It is also possible.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described in detail with reference to FIGS. FIG. 1 is a plan view of a battery pack showing a first embodiment of the present invention. FIG. 2 is a schematic layout view of the inside of the battery pack as viewed from the direction of arrow Y2 in FIG.

  In the case 2 of the battery pack 1, a plurality of modules 3 (3a, 3b, 3c, 3d) are arranged. In each of the modules 3a, 3b, 3c, and 3d, battery cells (not shown in FIG. 2) are gathered and arranged in series. An intake port 4 is provided on the back left side of the plane of the case 2 that houses the plurality of modules 3.

  The inside and the outside of the case 2 communicate with each other through the intake port 4. FIG. 3 is a schematic layout view of the intake chamber inside the battery pack as viewed from the direction of arrow Y3 in FIG. As can be seen from FIG. 3, the air inlet 4 does not directly communicate with the case 2 but supplies cooling air to the bottom of the module 3 through the air intake chamber 5. The intake chamber 5 is formed by a duct constituting a path for supplying cooling air from the outside of the battery pack 1 to the bottom of the module 3.

  A highly rigid center plate 6 that supports the battery pack 1 is provided so as to surround the case 2 in FIG. The battery pack 1 is supported by a battery frame (not shown) on the vehicle side via the center plate 6. Inside the battery pack 1, the module 3 is fixed to the center plate 6 (not shown). In FIG. 2, a battery management unit that becomes the control unit 7 and a junction box that forms the device unit 8 are provided in the upper part (upward direction) of the module 3. The device unit 8 includes a relay, a resistor, a fuse, a current sensor, and the like, but may include a service plug (S / P).

  As described above, the control unit 7 and the device unit 8 are disposed on the cooling air downstream side of the module 3. The upper temperature limit is in a relationship of (module 3 <control unit 7). That is, the upper limit of the temperature of the module 3 that is an assembly of battery cells is smaller than the upper limit of the temperature of the control unit 7. Further, regarding the relationship between the control unit 7 and the device unit 8, the control unit 7 has a smaller amount of heat generation than the device unit 8 (control unit 7 <device unit 8).

  As shown in FIG. 3, the intake chamber 5 that guides cooling air from the outside of the case 2 to the bottom of the module 3 allows air to flow into the inside of the case 2 (chamber) through the inclined portion 5a as shown in FIG. It is formed by the duct which leads to the bottom side of. FIG. 4 is a schematic layout view of the inside of the battery pack 1 as viewed from the direction of the arrow Y4 in FIG. As can be seen in FIG. 4, an exhaust port 9 is provided at the upper left end of the right side surface. The cooling air that has passed through the gaps between the modules 3 (3a, 3b, 3c, 3d), the interior of each module 3, and the module 3 and the case 2 from at least the air inlet 4 is shown in FIG. The suction fan 10 is led to the outside of the case 2 through the fan duct 9a and the exhaust port 9 and flows out as exhaust air. A gap between the outer case 2 and the module 3 or the like functions as an exhaust chamber.

  In this embodiment, four modules 3 (3a, 3b, 3c, 3d) are provided. On the upper part of the module 3, the current flowing from the module 3 is cut off and supplied, the voltage and temperature of the battery cell are detected, and the battery pack is used. Control devices 7 and 8 are provided for detecting the flowing current, detecting the temperature of the cooling air, controlling the interruption of the current flowing from the module 3, and supplying control, respectively. The control devices 7 and 8 are installed downstream of the module 3 in the flow of cooling air.

  The case 2 has an airtight structure that isolates the outside of the case 2 and the inside of the case 2 except for the intake port 4 and the exhaust port 9. That is, the case 2 is basically formed of an iron plate having no holes except for the intake port 4 and the exhaust port 9. Further, when a hole is made in an iron plate due to the necessity of wiring or the like, it is sealed so as to prevent moisture from entering and wind leakage as much as possible. Thus, since the case 2 is airtight, it is possible to prevent the cooling air from entering from the outside of the battery pack 1 or leaking out of the battery pack 1.

  The control devices 7 and 8 include a battery management unit that forms the control unit 7 provided above the module 3 and a junction box that forms the device unit 8. The device unit 8 may include a service plug. A battery management unit (BMU: Battery Management Unit) also has a function as a monitoring unit for monitoring a battery state, and a function as a calculation unit for calculating a change in voltage, a variation in voltage, and a movement amount of electric charge. The battery management unit 4 includes an input circuit, a microcomputer, and an output circuit. In the storage means of the microcomputer, the battery state is stored as data as needed. The stored battery state data includes, for example, battery voltage, charge / discharge current, temperature, and the like of the assembled battery.

  The junction box (J / B) contains a relay and resistors for turning on and off the current flowing through the current line, and generates a large amount of heat. A service plug (S / P) is a maintenance switch with a pull-out plug that disconnects the current line circuit so that it can be confirmed from the outside. Is visible.

  A suction fan 10 is provided inside the case 2 corresponding to the exhaust port 9. The suction fan 10 is an electric fan, and a sirocco fan is rotated by an electric motor. As shown in FIG. 1, the intake port 4 and the exhaust port 9 are arranged separately at both ends of the case 2. In addition, the intake port 4 and the exhaust port 9 are disposed on a diagonal line as viewed from the planar direction of the case 2. As a result, the distance between the intake port 4 and the exhaust port 9 is increased, and a shortcut to the leaked cooling air is prevented.

  Next, the configuration of the module 3 will be described. As shown in FIG. 2, the left and right modules 3 are stacked in two stages. The air discharge portions 5a, 5b, 5c, and 5d of the intake chamber 5 are positioned below the modules 3a, 3b, 3c, and 3d as shown in FIGS. Cooling air flows from the air discharge portions 5a, 5b, 5c, and 5d toward the bottom of the module 3.

  FIG. 5 is a plan view of the module 3 as seen from the direction of the arrow Y5 in FIG. The plane of the module case 15 is provided with a number of holes serving as air outlets 16. FIG. 6 is a bottom view of the module 3. On the bottom surface of the module case 15, a number of holes serving as air inlets 17 are provided. The module case 15 is covered with a module cover 15a.

  FIG. 7 is an internal schematic diagram of the module 3 in which the module cover 15a of the module case 15 is removed from the state of FIG. As shown in FIG. 7, a large number of cell holding units 20 and battery cells (unit cells) 21 sandwiched between these cell holding units 20 are provided inside the module 3. Cooling air flowing in from the holes serving as the air inlets 17 flows through the cooling air passage 22 formed between the battery cells 21.

FIG. 8 is a partially broken cross-sectional view as seen from the direction of arrow Y8 in FIG. FIG. 9 is a side view seen from the direction of arrow Y9 in FIG. 8 and 9, a side air discharge port 25 is provided on the side surface of the module case 15, and the cooling air introduced into the module 3 from the air inlet 17 in FIG. 5 is discharged from the air outlet 16 at the same time, and is also discharged from the side air outlet 25.
(Function and effect)
The first embodiment has the following operational effects. The battery pack 1 includes a plurality of modules 3 in which battery cells 21 are assembled and a case 2 that houses the modules 3. The case 2 has an intake port 4. There is an intake chamber 5 that communicates the inside and outside of the case 2 via the intake port 4 and guides cooling air from the outside of the case 2 to the bottom of the module 3.

  In addition, an exhaust port 9 that guides cooling air that has passed through at least the gap between the module 3 and the case 2 to the outside of the case 2 is provided. In addition, the current flowing from the module 3 is cut off and supplied, the voltage and temperature of the battery cell 21 are detected, the current flowing through the battery pack 1 is detected, the temperature of the cooling air is detected, and the current flowing from the module 3 is provided in the case 2. Are provided with control devices 7 and 8 for performing the cutoff control and the supply control. The control devices 7 and 8 are installed downstream of the module 3 in the flow of cooling air.

  According to this, it is possible to reliably cool the control devices 7 and 8 that generate a large amount of heat while cooling the battery cells 21 in the module 3. Further, since the control devices 7 and 8 are cooled after cooling the module 3 with cooling air first, the upper temperature limit of the control devices 7 and 8 can be made higher than the upper temperature limit of the battery cell 21. .

  And the control equipment 7 and 8 consists of the control part 7 and the equipment part 8, and the equipment part 8 is arrange | positioned at the cooling air downstream of the control part 7 like FIG. FIG. 10 is a schematic layout view inside the battery pack as seen from the plane direction showing the first embodiment. FIG. 11 is a schematic layout view inside the battery pack as viewed from the direction of arrow Y11 in FIG. Further, FIG. 12 is a schematic layout view inside the battery pack as seen from the direction of arrow Y12 in FIG.

  In FIG. 10, the junction box constitutes the device unit 8. The device unit 8 may include a service plug. The device unit 8 is arranged in series on the downstream side of the battery management unit constituting the control unit 7. The arrows W in FIGS. 10 to 12 indicate the flow of cooling air.

  Therefore, since the control unit 7 having a smaller calorific value than that of the device unit 8 is disposed upstream of the device unit 8, the device unit 8 is cooled by the cooling air that has cooled the control unit 7. In addition, a temperature difference ΔT from the cooling air (temperature difference ΔT = temperature of each control device−cooling air temperature) can be secured, and the control unit 7 and the device unit 8 can be reliably cooled.

  In addition, by disposing the device unit 8 on the downstream side of the module 3, it is possible to reliably cool the device unit 8 that generates a lot of heat while cooling the battery cells 21 in the module 3. The upper temperature limit has a relationship of (battery cell 21 <control unit 7). That is, the upper limit of the temperature of the battery cell 21 is smaller than the upper limit of the temperature of the control unit 7.

  Further, regarding the relationship between the control unit 7 and the device unit 8, the heat generation amount of the control unit 7 is smaller than that of the device unit 8 (control unit 7 <device unit 8). Therefore, by incorporating the control unit 7 in the battery pack 1 and disposing the device unit 8 on the downstream side of the control unit 7, the control unit 7 with a small amount of heat generation, and then the device unit 8 are cooled in this order. Both the control unit 7 and the device unit 8 can be sufficiently cooled.

  Next, the intake chamber 5 that guides the cooling air from the outside of the case 2 to the bottom of the module 3 is formed by a duct that guides air from the intake port 4 at one corner to the bottom of the chamber through the inclined portion 5a (FIG. 3). ing. As can be seen from FIG. 4 which is a right side view, an exhaust port 9 is provided at the upper left end of the right side surface. The cooling air that has passed through at least the gap between the module 3 and the case 2 is guided to the outside of the case 2 through the exhaust port 9. Thereby, the cooling air flowing out from the module 3 passes around the module 3 and flows out as exhaust air.

  That is, the gap between the outer case 2 and the module 3 functions as an exhaust chamber. Therefore, it is not necessary to provide a special exhaust chamber for guiding exhaust from the module 3. And since the exhaust chamber can be made unnecessary, the battery pack 1 can be reduced in size.

  The case 2 has an airtight structure that isolates the outside of the case 2 and the inside of the case 2 except for the intake port 4 and the exhaust port 9. Therefore, it is possible to prevent the cooling air from entering or leaking out of the battery pack 1 and to secure the waterproof property of the battery pack 1.

  Further, since the suction fan 10 is built in the case 2, the pressure loss can be reduced and the inside of the case 2 can be cooled compared to the case where a fan is provided outside the case 2.

  Further, since the intake port 4 and the exhaust port 9 are separated and arranged diagonally at both ends of the case 2, even when cooling air leaks from the intake chamber 5, the cooling air flows from the leaked portion to the exhaust port 5. The module 3 can be reliably cooled without performing a shortcut. Next, by arranging the intake port 4 and the exhaust port 9 in the upper part (top side) of the battery pack 1, the vehicle-side intake / exhaust duct outside the battery pack 1 can be easily arranged and maintenance can be facilitated.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. In the following embodiments, the same components as those in the first embodiment described above are denoted by the same reference numerals, description thereof will be omitted, and different configurations and features will be described. FIG. 13 is a schematic layout view inside the battery pack as seen from the plane direction showing the second embodiment of the present invention. FIG. 14 is a schematic layout view inside the battery pack as viewed from the direction of arrow Y14 in FIG.

  In FIG. 13, the junction box constitutes the device unit 8. The device unit 8 may include a service plug. The device unit 8 is arranged in parallel to the battery management unit that forms the control unit 7. And the apparatus part 8 and the control part 7 are arrange | positioned in parallel with respect to the cooling air. Therefore, the cooling air can be individually supplied to the control unit 7 and the device unit 8. In addition, an arrow W in FIGS. 13 and 14 indicates the flow of the cooling air in the case 2.

(Third embodiment)
Next, a third embodiment of the present invention will be described. In the following embodiments, the same components as those in the first embodiment described above are denoted by the same reference numerals, description thereof will be omitted, and different configurations and features will be described. FIG. 15 is a schematic layout view inside the battery pack as seen from the plane direction showing the third embodiment of the present invention. FIG. 16 is a schematic layout view inside the battery pack as seen from the direction of arrow Y16 in FIG. Further, FIG. 17 is a schematic layout view of the inside of the battery pack as seen from the direction of arrow Y17 in FIG.

  In FIG. 15, the junction box constitutes the device unit 8. The device unit 8 may include a service plug. The device unit 8 is disposed at a substantially symmetrical position with respect to the battery management unit constituting the control unit 7. And the suction fan 10 is provided in the center part, and the apparatus part 8 and the control part 7 are arrange | positioned in parallel with respect to the cooling air. Therefore, the cooling air can be individually supplied to the control unit 7 and the device unit 8. Cooling air is discharged from the suction fan 10 to the outside of the case 2 of the battery pack 1 through the exhaust port 9 on the back surface through the exhaust duct. The arrows in FIGS. 15 to 17 indicate the flow of cooling air in the case 2.

(Other embodiments)
The present invention is not limited to the above-described embodiments, and can be modified or expanded as follows. For example, in each of the above-described embodiments, a sirocco fan whose suction direction and discharge direction are orthogonal to each other is used as the suction fan, but an axial fan may be used.

DESCRIPTION OF SYMBOLS 1 Battery pack 2 Case 3 (3a, 3b, 3c, 3d) Module 4 Intake port 5 Intake chamber 7 Control part (battery management unit)
7, 8 Control equipment 8 Equipment section 9 Exhaust port 10 Suction fan 21 Battery cell

Claims (7)

A module (3) comprising a plurality of battery cells (21);
A case (2) for housing a plurality of the modules (3);
An air inlet (4) provided in the case (2);
An intake chamber (5) that communicates the inside and outside of the case (2) via the intake port (4) and guides cooling air from the outside of the case (2) to the module (3);
An exhaust port (9) for guiding the cooling air that has passed through the gap between the module (3) and the case (2) to the outside of the case (2);
A control device (7, 8) provided in the case (2) for cutting off and supplying a current flowing from the module (3);
With
The battery pack according to claim 1, wherein the control device (7, 8) is installed downstream of the module (3) in the flow of the cooling air. The control device (7, 8) includes a device unit (8) having a built-in switch for cutting off and supplying a current flowing from the module (3), and a control unit (7) for detecting the voltage or temperature of the battery cell. )
The battery pack according to claim 1, wherein the device section (8) is arranged on the downstream side of the control section (7). The control device (7, 8) includes a device unit (8) having a built-in switch for cutting off and supplying a current flowing from the module (3), and a control unit (7) for detecting the voltage or temperature of the battery cell. )
The battery pack according to claim 1, wherein the device section (8) and the control section (7) are arranged in parallel to the cooling air.   The case (2) has an airtight structure that isolates the outside of the case (2) and the inside of the case (2) except for the intake port (4) and the exhaust port (9). The battery pack according to any one of claims 1 to 3.   The battery pack according to claim 4, wherein a suction fan (10) is built in the case (2) communicating with the exhaust port (9) via a fan duct.   The said intake port (4) and the said exhaust port (9) are separately arrange | positioned at the both ends of the said case (2), The Claim 1 thru | or 5 characterized by the above-mentioned. Battery pack.   The battery pack according to claim 6, wherein the both end portions are positioned on the upper side of the case.

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