JP2006179190A - On-vehicle battery pack - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact on-vehicle battery pack capable of cooling a layer-built battery assembly efficiently and uniformly. <P>SOLUTION: This on-vehicle battery pack is provided with a case body, which includes a layer-built battery assembly 10 and a ventilation passage inside, and an evaporator 20 for an air conditioning freezing cycle arranged inside the case body for cooling cooling air flowing through the ventilation passage. The case body includes an air intake port 8a, a cooling chamber for installing the layer-built battery assembly 10, and an air intake duct 8 connecting the air intake port 8a and the cooling chamber together. The air intake duct 8 is provided with an opening part 8b facing the cooling chamber and extending along the layering direction of the layer-built battery assembly 10. The evaporator 20 is arranged between the air intake duct 8b and the cooling chamber so that the cooling air ventilation passage arranged inside the evaporator 20 faces the opening part 8b and the cooling chamber. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an in-vehicle battery pack mounted on an electric vehicle or the like.

  In recent years, an electric vehicle using an electric motor as a drive source and a so-called hybrid electric vehicle combining an electric motor as a drive source and another drive source have been put into practical use. In such a vehicle, a battery for supplying electricity as energy to the electric motor is mounted. As this battery, for example, a secondary battery represented by a nickel-cadmium battery, a nickel-hydrogen battery, a lithium ion battery, or the like that can be repeatedly charged and discharged is used.

  The secondary battery is configured as a stacked battery assembly in which battery cells and battery modules are stacked, and is mounted on an automobile in a state in which the stacked battery assembly is housed inside the case body. A battery pack including the case body, the laminated battery assembly housed in the case body, and other internal components is referred to as a battery pack.

  Each battery cell or battery module generates heat due to an internal electrochemical reaction or Joule heat, and the temperature rises. When the battery cell or the battery module reaches a high temperature, the power generation efficiency decreases and the life of the battery decreases. For example, cooling air is introduced into the case body from the outside of the case body to cool the battery module.

As a cooling structure of the in-vehicle battery pack using the cooling air, various structures have been proposed (for example, Japanese Patent Application Laid-Open No. 2004-6089 (Patent Document 1) and Japanese Patent Application Laid-Open No. 2002-31441 ( Patent Document 2), Japanese Patent Laid-Open No. 7-6796 (Patent Document 3), etc.). Among these, in Patent Documents 2 and 3, an evaporator of an air-conditioning refrigeration cycle is installed in a ventilation path that is a cooling path of a laminated battery assembly provided inside an in-vehicle battery pack, and cooling that circulates in the ventilation path. The structure which cools a wind using this evaporator is disclosed.
JP 2004-6089 A JP 2002-31441 A Japanese Patent Laid-Open No. 7-6796

  However, in the case of the configuration of the in-vehicle battery pack described in Patent Documents 2 and 3 described above, it is inevitable that the size of the entire in-vehicle battery pack increases. In addition, simply installing the evaporator of the air-conditioning refrigeration cycle in the ventilation path may not necessarily efficiently cool the stacked battery assembly, and may result in insufficient cooling performance. Furthermore, in consideration of the reliability of the multilayer battery assembly, it is required to uniformly cool the entire area of the multilayer battery assembly. However, without taking this into consideration, the evaporator of the air-conditioning refrigeration cycle is simply ventilated. When installed in the road, significant temperature unevenness occurs in the laminated battery assembly, which causes a significant decrease in reliability.

  Accordingly, the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a small in-vehicle battery pack capable of cooling a laminated battery assembly with high efficiency and uniformity. .

  An in-vehicle battery pack according to the present invention circulates through a laminated battery assembly, a case body including therein a laminated battery assembly and a refrigerant channel provided around the laminated battery assembly, and the refrigerant channel. And an evaporator of an air-conditioning refrigeration cycle installed inside the case body in order to cool the refrigerant. The case body includes a refrigerant introduction port for introducing the refrigerant into the case body, a cooling chamber in which the stacked battery assembly is installed, and a communication portion that communicates the refrigerant introduction port and the cooling chamber. Including. The communication portion has an opening that faces the cooling chamber and extends in the stacking direction of the stacked battery assembly. The evaporator is installed between the communication portion and the cooling chamber so that a flow path of the refrigerant provided in the evaporator faces the opening and the cooling chamber.

  With this configuration, the refrigerant is cooled by the evaporator immediately before being introduced into the cooling chamber, so that the stacked battery assembly can be effectively cooled and the flow rate of the refrigerant is set to be small. Is also possible. Therefore, it can be set as the small vehicle-mounted battery pack which can cool a laminated battery assembly with high efficiency. In addition, since the refrigerant is rectified by the evaporator immediately before being introduced into the cooling chamber, the refrigerant can be uniformly supplied to the stacked battery assembly. Therefore, it is possible to significantly reduce the temperature unevenness generated in the laminated battery assembly, and a highly reliable vehicle battery pack can be obtained.

  In the on-vehicle battery pack according to the present invention, it is preferable that a cross-sectional area of the refrigerant flow path provided in the evaporator is larger than an opening area of the refrigerant introduction port.

  By comprising in this way, it becomes possible to ensure large cross-sectional area of the refrigerant | coolant flow path in the part in which an evaporator is installed. Therefore, the cooling air diverted at the communication portion can be effectively cooled and rectified by the evaporator, and even when the area of the refrigerant inlet is reduced, the stacked battery assembly can be cooled efficiently and uniformly. Is possible.

  In the on-vehicle battery pack according to the present invention, the evaporator is preferably disposed close to the multilayer battery assembly, and in that case, a heat insulating material is provided between the evaporator and the multilayer battery assembly. Is preferably interposed.

  In order to cool the stacked battery assembly more effectively, it is preferable to arrange the evaporator and the stacked battery assembly close to each other as described above. However, when the evaporator is placed in contact with the stacked battery assembly, the stacked battery assembly may be overcooled locally in the vicinity of the contact portion, resulting in large temperature unevenness in the stacked battery assembly. Is concerned. However, by interposing a heat insulating material between the evaporator and the stacked battery assembly as described above, such a problem is solved, and a decrease in the reliability of the stacked battery assembly is prevented.

  In the in-vehicle battery pack according to the present invention, a control unit for controlling the battery system including the stacked battery assembly may be disposed inside the case body, and in that case, the evaporator Is preferably arranged close to the control unit.

  By comprising in this way, the control part which is a heat-emitting component can also be cooled effectively.

  In the in-vehicle battery pack according to the present invention, when the refrigerant is cooling air, the case body discharges condensed water of the cooling air generated near the evaporator to the outside of the case body. It is preferable to further include a drain portion.

  By comprising in this way, the dew condensation water which generate | occur | produces with an evaporator can be discharged | emitted to the case body exterior.

  ADVANTAGE OF THE INVENTION According to this invention, it can be set as the small vehicle-mounted battery pack which can cool a laminated battery assembly highly efficiently and uniformly. Therefore, it can be set as the vehicle-mounted battery pack excellent in in-vehicle property and reliability.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment 1)
1 is a schematic perspective view of the in-vehicle battery pack according to Embodiment 1 of the present invention, and FIG. 2 is a schematic cross-sectional view taken along the line II-II in FIG. 1 of the in-vehicle battery pack shown in FIG. It is. FIG. 3 is an exploded view of the in-vehicle battery pack according to the present embodiment. The in-vehicle battery pack 1A in the present embodiment has a so-called upflow type cooling structure in which the cooling air passes through the inside of the laminated battery assembly from below to above.

  As shown in FIG. 1 and FIG. 2, an in-vehicle battery pack 1 </ b> A according to the present embodiment includes a case body 2 composed of an upper case 3 and a lower case 4, and a laminated battery assembly disposed inside the case body 2. 10, an intake duct 8, an exhaust duct 9, and an equipment box 30 are mainly provided.

  The case body 2 is formed as a box-like body having a space inside by combining the upper case 3 and the lower case 4 and fastening the upper case 3 and the lower case 4 with bolts 33 at the ends. The space inside the case body 2 includes a cooling chamber (chamber) that is an installation space for the stacked battery assembly 10.

  As shown in FIG. 3, the stacked battery assembly 10 is configured by stacking a plurality of battery modules 11. As the battery module 11, for example, a secondary battery such as a nickel-cadmium battery, a nickel-hydrogen battery, or a lithium ion battery can be used. The battery module 11 has a so-called square plate-like outer shape.

  Projections 11a (see FIG. 2) are provided on the side surfaces of the individual battery modules 11, and the projections 11a constitute ridges that extend to the side surfaces of the stacked battery assembly 10 after stacking. End plates 15 for maintaining the stacked state of the stacked battery assemblies 10 are disposed at both ends in the stacking direction of the stacked battery assemblies 10, and these pair of end plates 15 are the above-described stacked battery assemblies 10. Are connected by a bracket 26 that engages with a protrusion formed on the side surface of the battery module 11 and a restraining band (not shown) that is provided on the upper and lower parts of the battery module 11 and restricts the battery module 11 in the stacking direction. .

  As shown in FIG. 2, a convex portion 12 is provided on the main surface of each battery module 11, and cooling air as a coolant is circulated between the battery modules 11 stacked by the convex portion 12. A part of the ventilation path is formed. The laminated battery assembly 10 is arranged to be inclined with a predetermined angle with respect to the bottom surface of the lower case 4.

  The internal space of the case body 2 is partitioned by the laminated battery assembly 10 disposed inside the case body 2. An upper space 5 is formed between the upper surface of the stacked battery assembly 10 and the upper case 3. A lower space 6 is formed between the lower surface of the stacked battery assembly 10 and the lower case 4. Between the side surfaces on both sides of the laminated battery assembly 10 and the side surfaces on both sides of the upper case 3 and the lower case 4, a right side space 7a and a left side space 7b, which are a pair of left and right side spaces, are provided. Is formed. Here, what includes the above-described upper space 5 and lower space 6 and the space where the laminated battery assembly 10 is installed corresponds to the above-described cooling chamber.

  A gasket 23 is interposed between the upper space 5, the right side space 7a, and the left side space 7b, and airtightness between these spaces is ensured. Further, a gasket 23 is also interposed between the lower space 6, the right side space 7a, and the left side space 7b, and airtightness between these spaces is ensured. As the gasket 23, for example, a cushion seal made of independently foamed EPDM rubber is used. The upper space 5 and the lower space 6 communicate with each other via a ventilation path formed in the above-described laminated battery assembly 10.

  An exhaust terminal 14 for discharging a gas such as hydrogen gas discharged from the inside of the battery module 11 to the outside is provided on the upper part of the stacked battery assembly 10. The upper space 5 is provided with an exhaust hose 18 connected to the exhaust terminal 14 for leading the gas discharged from the exhaust terminal 14 to the outside of the in-vehicle battery pack 1A. Further, a temperature sensor 19 for detecting the temperature of the stacked battery assembly 10 is installed on the upper surface of the stacked battery assembly 10. A terminal 13 for charging / discharging the battery module 11 is provided on the side surface of the battery module 11. These terminals 13 are connected by a bus bar (not shown).

  An intake duct 8 and an exhaust duct 9 are respectively installed in the right side space 7a and the left side space 7b located on the side of the multilayer battery assembly 10. As shown in FIG. 1, the intake duct 8 communicates with an intake port 8 a provided on the front surface of the case body 2. The exhaust duct 9 communicates with an exhaust port 9 a provided on the front surface of the case body 2. The intake duct 8 communicates with the lower space 6, and the exhaust duct 9 communicates with the upper space 5. Here, the intake duct 8 corresponds to a communication portion that connects the intake port 8a that is the refrigerant introduction port and the lower space 6 that is a part of the cooling chamber.

  A control unit 101 (see FIG. 5) that controls the battery system including the in-vehicle battery pack 1A is disposed in the device box 30. The control unit 101 is usually constituted by a circuit formed on a printed wiring board. Details of the control unit 101 will be described later.

  As shown in FIG. 2, in the in-vehicle battery pack 1 </ b> A according to the present embodiment, an air-conditioning refrigeration is provided between an intake duct 8 that is a communication portion and a lower space 6 that is a part of a cooling chamber. A cycle evaporator 20 is arranged. The evaporator 20 is a component part of an air conditioner for air conditioning the vehicle interior of the vehicle, and is connected to a compressor of an air conditioning refrigeration cycle via a pipe 22 (see FIG. 3).

  As shown in FIG. 3, the evaporator 20 includes fins 21 having a corrugated structure, and a space between the fins 21 is a ventilation path that is a flow path for cooling the stacked battery assembly 10. Become part. Therefore, the cooling air flows into the space in the evaporator from one side surface of the evaporator 20 and flows out from the other side surface.

  The side surface of the evaporator 20 on the cooling air inflow side is disposed so as to face the opening 8 b provided on the lower side surface of the intake duct 8. The opening 8 b of the intake duct 8 is provided so as to extend along the stacking direction of the stacked battery assembly 10. On the other hand, the side surface of the evaporator 20 on the cooling air outflow side is arranged so as to face the lower space 6 described above.

  FIG. 4 is a schematic diagram for explaining the flow of cooling air in the vicinity of the intake duct of the in-vehicle battery pack according to the present embodiment. As shown in FIG. 4, in the in-vehicle battery pack 1 </ b> A having the above-described configuration, the cooling air flowing into the intake duct 8 from the intake port 8 a flows along the extending direction of the intake duct 8. Then, it passes through the evaporator 20 through the opening 8 b provided in the intake duct 8 and flows into the lower space 6. At this time, the cooling air is cooled by exchanging heat with the evaporator 20.

  As shown in FIG. 2, the cooling air cooled by the evaporator 20 and flowing into the lower space 6 flows into the upper space 5 via the ventilation path formed inside the stacked battery assembly 10. At this time, the stacked battery assembly 10 is cooled by receiving heat generated in the stacked battery assembly 10. The cooling air flowing into the upper space 5 flows into the exhaust duct 9, flows along the extending direction of the exhaust duct 9, and is then discharged from the exhaust duct 9 to the outside of the in-vehicle battery pack 1 </ b> A.

  As described above, in the in-vehicle battery pack 1 </ b> A according to the present embodiment, the cooling air is cooled to a lower temperature by the evaporator 20 and then used for cooling the stacked battery assembly 10. Usually, air in the passenger compartment is often used as the cooling air introduced into the case body 2, and thus the above configuration makes it possible to cool the multilayer battery assembly 10 more effectively. Become. In addition, since the flow rate of the cooling air can be set smaller than when the air in the vehicle compartment is used as the cooling air as it is, the overall size of the in-vehicle battery pack can be reduced.

  In the in-vehicle battery pack 1A according to the present embodiment, the laminated battery assembly 10 and the evaporator 20 are disposed close to each other, so that the cooled cooling air can be supplied to the laminated battery assembly 10 quickly. For this reason, it becomes possible to cool the laminated battery assembly 10 more efficiently than in the case where the evaporator 20 is arranged upstream of the boundary portion between the intake duct 8 and the lower space 6.

  The evaporator 20 has a large number of corrugated fins 21 over the entire area. For this reason, the fin 21 of this corrugated structure acts as a resistance against the flow of the cooling air, and as a result, the evaporator 20 functions as a rectifier for the cooling air. Therefore, the evaporator 20 rectifies immediately before the cooling air is supplied to the laminated battery assembly 10, and the air velocity of the cooling air is made uniform with respect to the ventilation path formed inside the laminated battery assembly 10. Will be supplied. Therefore, the laminated battery assembly 10 can be uniformly cooled over the entire area, and the temperature unevenness generated in the laminated battery assembly 10 can be significantly suppressed. As a result, a highly reliable vehicle battery pack can be obtained.

  Further, in vehicle-mounted battery pack 1A in the present embodiment, the cross-sectional area of the cooling air ventilation path provided in evaporator 20 is formed to be larger than the opening area of intake port 8a that is the refrigerant inlet. By configuring in this way, it becomes possible to ensure a large cross-sectional area of the flow path of the cooling air in the portion where the evaporator 20 is installed. Therefore, the cooling air diverted in the intake duct 8 can be effectively cooled and rectified by the evaporator 20, and even when the intake port 8a is reduced in area, the laminated battery assembly can be efficiently and uniformly obtained. 10 can be cooled.

  Further, in the in-vehicle battery pack 1A according to the present embodiment, the stacked battery assembly 10 and the evaporator 20 are disposed close to each other. However, between the stacked battery assembly 10 and the evaporator 20, a gasket 23 is provided. A cushion seal made of EPDM rubber is interposed. The gasket 23 has a function as a heat insulating material, and prevents the laminated battery assembly 10 from coming into contact with the evaporator 20. By configuring in this manner, the occurrence of local overcooling of the laminated battery assembly 10 is prevented, so that the laminated battery assembly 10 can be uniformly cooled over the entire area.

  Furthermore, in vehicle-mounted battery pack 1A according to the present embodiment, device box 30 in which control unit 101 is built in and evaporator 20 are arranged close to each other, so that control unit 101 can be efficiently cooled. It is.

  FIG. 5 is a block diagram of an automobile using the battery system including the in-vehicle battery pack shown in FIG. Referring to FIG. 5, an automobile 100 to which a battery system including an in-vehicle battery pack according to the present invention is applied includes a control unit 101 and a battery assembly mounted on in-vehicle battery pack 1A in the present embodiment. A battery unit 102 and a drive unit 103 are provided. As described above, the control unit 101 is installed in the device box 30 disposed inside the in-vehicle battery pack 1 </ b> A, and controls the battery unit 102 and the drive unit 103. The drive unit 103 may include an internal combustion engine such as a gasoline engine or a diesel engine in addition to an electric motor such as a motor driven by a current supplied from the battery unit 102. That is, the automobile 100 includes not only an electric vehicle that uses only an electric motor such as a motor driven by a current supplied from the battery unit 102 as a driving source, but also a driving means other than an electric motor such as a gasoline engine as a driving source. So-called hybrid cars are also included.

(Embodiment 2)
FIG. 6 is a schematic cross-sectional view of the in-vehicle battery pack according to Embodiment 2 of the present invention. In addition, the same code | symbol is attached | subjected in the figure about the part similar to vehicle-mounted battery pack 1A in the above-mentioned Embodiment 1, and the description is not repeated here.

  As shown in FIG. 6, the in-vehicle battery pack 1 </ b> B in the present embodiment has a drain portion at a predetermined position of the lower case 4. This drain portion is located below the boundary between the intake duct 8 where the evaporator 20 is installed and the lower space 6, and a part of the lower case 4 is provided with a recess, and a hole is provided in the bottom of the recess, It is formed by installing a filter 34 in this recess. This drain portion is a mechanism for discharging condensed water generated when cooling air passes through the evaporator 20 to the outside of the case body 2. As the filter 34, a filter that allows liquid to pass but does not allow gas to pass is used. Is done.

  By comprising in this way, in addition to the effect as described in Embodiment 1 described above, it is possible to prevent the occurrence of various problems caused by the presence of condensed water inside the case body 2.

(Embodiment 3)
7 is a schematic perspective view of the in-vehicle battery pack according to Embodiment 3 of the present invention, and FIG. 8 is a schematic cross-sectional view of the in-vehicle battery pack shown in FIG. 7 taken along line VIII-VIII in FIG. It is. FIG. 9 is an exploded view of the in-vehicle battery pack according to the present embodiment. The on-vehicle battery pack 1C in the present embodiment has a so-called downflow type cooling structure in which cooling air passes through the inside of the laminated battery assembly from the top to the bottom. In addition, the same code | symbol is attached | subjected in the figure about the part similar to vehicle-mounted battery pack 1A in the above-mentioned Embodiment 1, and the description is not repeated here.

  As shown in FIGS. 7 and 8, the in-vehicle battery pack 1 </ b> C according to the present embodiment is installed in a case body 2 including an upper case 3 a, 3 b divided into two parts and a lower case 4, and inside the case body 2. The laminated battery assembly 10 is provided. In the in-vehicle battery pack 1 </ b> C according to the present embodiment, each battery module 11 is fixed to the lower case 4 of the case body 2 with bolts 32.

  An upper space 5 is provided above the in-vehicle battery pack 1C, and a lower space 6 is provided below the in-vehicle battery pack 1C. The upper space 5 communicates with an intake port 5 a provided on the front surface of the case body 2. The lower space 6 communicates with an exhaust port 6 a provided on the front surface of the case body 2. The upper space 5 and the lower space 6 communicate with each other through an air passage formed inside the laminated battery assembly 10. In the in-vehicle battery pack 1C according to the present embodiment, the space where the stacked battery assembly 10 is installed and the space located above and below the evaporator 20 described later correspond to the cooling chamber. A space located above the evaporator 20 described later corresponds to the upper space 5. Therefore, the upper space 5 corresponds to a communication portion that communicates the intake port 5a that is the refrigerant introduction port and the cooling chamber.

  Further, a right side space 7a and a left side space 7b in which internal components such as a bus bar for ensuring electrical connection of the individual battery modules 11 are arranged are provided on the side of the in-vehicle battery pack 1C. . In the in-vehicle battery pack 1C in the present embodiment, unlike the in-vehicle battery pack 1A in the above-described first embodiment, the intake duct 8 and the exhaust duct 9 are provided in the right side space 7a and the left side space 7b. It is not done.

  As shown in FIG. 7 and FIG. 8, in the in-vehicle battery pack 1C in the present embodiment, between the upper space 5 that is a communication portion and the cooling chamber in which the laminated battery assembly 10 is installed, An evaporator 20 of an air conditioning refrigeration cycle is disposed. As shown in FIG. 9, the evaporator 20 includes fins 21 having a corrugated structure, and a space between the fins 21 is a ventilation path that is a flow path for cooling the stacked battery assembly 10. Become part. Therefore, the cooling air flows into the space in the evaporator from the upper surface side of the evaporator 20 and flows out from the lower surface side.

  The upper surface of the evaporator 20 is disposed so as to face the opening located on the lower surface of the upper space 5. Here, the opening of the upper space 5 is defined by the upper surface of the evaporator 20, and extends along the stacking direction of the stacked battery assembly 10. On the other hand, the lower surface of the evaporator 20 is disposed so as to face the cooling chamber described above.

  Between the evaporator 20 and the upper case 3a, 3b divided into two, a gasket 24 is attached for hermetically sealing the gap between the evaporator 20 and the upper case 3a, 3b. As the gasket 24, for example, a cushion seal made of independently foamed EPDM rubber or the like is used similarly to the gasket 23 described above.

  FIG. 10 is a schematic diagram for explaining the flow of cooling air inside the case body of the in-vehicle battery pack according to the present embodiment. As shown in FIG. 10, in the in-vehicle battery pack 1C having the configuration as described above, the cooling air flowing into the upper space 5 of the battery pack 1C from the air inlet 5a flows along the extending direction of the upper space 5. However, it passes through the evaporator 20 through the opening which is the lower surface of the upper space 5 and flows into the cooling chamber. At this time, the cooling air is cooled by exchanging heat with the evaporator 20.

  The cooling air that has flowed into the cooling chamber moves to the lower space 6 via the ventilation path formed between the stacked battery modules 11. At this time, the stacked battery assembly 10 is cooled by receiving heat generated in the stacked battery assembly 10. The cooling air flowing into the lower space 6 flows along the extending direction of the lower space 6 and is then discharged from the exhaust port 6a to the outside of the battery pack 1C.

  By adopting a configuration such as the in-vehicle battery pack 1C having the configuration described above, it is possible to obtain the same effects as those described in the first embodiment. In particular, in the case of the configuration as in-vehicle battery pack 1C in the present embodiment, the cross-sectional area of the cooling air ventilation path formed in evaporator 20 is set to the in-vehicle battery pack 1A in the above-described first embodiment. Therefore, it is possible to obtain a high cooling performance.

  In the on-vehicle battery packs 1A to 1C according to the first to third embodiments of the present invention described above, the case where air in the vehicle compartment is used as a refrigerant has been described as an example. Of course, it is also possible to use. Further, the refrigerant is not necessarily limited to gas, and liquid may be used depending on circumstances.

  Thus, the above-described embodiments disclosed herein are illustrative in all respects and are not restrictive. The technical scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is a schematic perspective view of the vehicle-mounted battery pack in Embodiment 1 of this invention. It is a schematic cross section along the II-II line in FIG. 1 of the vehicle-mounted battery pack in Embodiment 1 of this invention. It is an exploded view of the vehicle-mounted battery pack in Embodiment 1 of this invention. It is a schematic diagram for demonstrating the flow of the cooling air in the duct for intake of the vehicle-mounted battery pack in Embodiment 1 of this invention. It is a block diagram of the motor vehicle using the battery system containing the vehicle-mounted battery pack in Embodiment 1 of this invention. It is a schematic cross section of the vehicle-mounted battery pack in Embodiment 2 of this invention. It is a schematic perspective view of the vehicle-mounted battery pack in Embodiment 3 of this invention. It is a schematic cross section along the VIII-VIII line in FIG. 7 of the vehicle-mounted battery pack in Embodiment 3 of this invention. It is an exploded view of the vehicle-mounted battery pack in Embodiment 3 of this invention. It is a schematic diagram for demonstrating the flow of the cooling air inside the case body of the vehicle-mounted battery pack in Embodiment 3 of this invention.

Explanation of symbols

  1A to 1C In-vehicle battery pack, 2 case body, 3 upper case, 3a, 3b upper case divided body, 4 lower case, 5 upper space, 5a intake port, 6 lower space, 6a exhaust port, 7a right side space, 7b Left side space, 8a Inlet, 8 Intake duct, 8b Opening, 9a Exhaust, 9 Exhaust duct, 10 Stacked battery assembly, 11a Protruding part, 11 Battery module, 12 Convex part, 13 Terminal, 14 Exhaust Terminal, 15 End plate, 18 Exhaust hose, 19 Temperature sensor, 20 Evaporator, 21 Fin, 22 Piping, 23, 24 Gasket, 30 Equipment box, 33 Bolt, 34 Filter, 100 Car, 101 Control part, 102 Battery part, 103 Drive part.

Claims (5)

A laminated battery assembly, a case body including therein the laminated battery assembly and a refrigerant flow path provided around the laminated battery aggregate, and an inside of the case body for cooling the refrigerant flowing through the refrigerant flow path An in-vehicle battery pack provided with an evaporator of an air-conditioning refrigeration cycle installed in
The case body includes a refrigerant introduction port for introducing the refrigerant into the case body, a cooling chamber in which the stacked battery assembly is installed, and a communication portion that communicates the refrigerant introduction port and the cooling chamber. Including
The communication portion has an opening facing the cooling chamber and extending along the stacking direction of the stacked battery assembly,
The in-vehicle battery pack, wherein the evaporator is installed between the communication portion and the cooling chamber so that a flow path of the refrigerant provided in the evaporator faces the opening and the cooling chamber.   The in-vehicle battery pack according to claim 1, wherein a cross-sectional area of a flow path of the refrigerant provided in the evaporator is larger than an opening area of the refrigerant introduction port. The evaporator is disposed in proximity to the stacked battery assembly,
The in-vehicle battery pack according to claim 1 or 2, wherein a heat insulating material is interposed between the evaporator and the stacked battery assembly. Inside the case body, a control unit for controlling the battery system including the stacked battery assembly is disposed,
The in-vehicle battery pack according to claim 1, wherein the evaporator is disposed in proximity to the control unit. The refrigerant is cooling air;
The in-vehicle battery according to any one of claims 1 to 4, wherein the case body further includes a drain portion for discharging condensed water of the cooling air generated in the vicinity of the evaporator to the outside of the case body. pack.

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