JP2016225249A - Battery pack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery pack capable of improving cooling performance of a battery and an electric component, with a suppressed operation time of a fluid drive device.SOLUTION: A battery pack 1 includes: a cell laminate 2; a battery aisle 60 formed to make an air flow which contacts to a member through which the heat of the cell laminate 2 is heat transferred; and a component case 80 for housing an electric component 82 which operates at the charge or discharge of the cell laminate 2. The component case 80 includes an upstream side surface 800 exposed to an external atmosphere. The component case 80 is provided in such a manner that an air, driven by a blower 4 and flowing out of the battery aisle 60, contacts to the upstream side surface 800.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a battery pack for a vehicle that can cool a battery and electrical components.

  Patent Document 1 discloses a battery pack for a vehicle that houses a plurality of batteries for supplying power to a traveling motor and electric components connected to the motor or batteries in one battery box. The air supplied from the outside of the battery box during operation of the cooling fan contacts the battery located upstream of the electrical components in the battery box to cool the battery, and then contacts the downstream electrical components to produce electricity. The parts are cooled and discharged outside the battery box.

Japanese Patent No. 3509517

  In the battery pack described in Patent Document 1, since the electrical component and the battery are housed in a common battery box, the heat of the electrical component is generated when the cooling fan is stopped, such as air in the battery box or an individual battery box. There is a problem of being transmitted to the battery through the object. In addition, when the cooling fan is stopped, air does not flow in the battery box, so heat is trapped in the battery box, and there is a problem in that deterioration of the battery and electrical parts due to heat is accelerated. Therefore, the battery pack is required to improve the cooling performance for both the electrical component and the battery.

  On the other hand, if the operation time of the cooling fan is lengthened in order to suppress the heat from being accumulated in the battery box, the amount of power stored in the battery is consumed, which has an adverse effect such as shortening the travelable distance of the vehicle.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a battery pack capable of improving the cooling performance of the battery and the electrical components and suppressing the operation time of the fluid drive device.

  The present invention employs the following technical means to achieve the above object. In addition, the reference numerals in parentheses described in the claims and in this section indicate the correspondence with the specific means described in the embodiment described later as one aspect, and the technical scope of the present invention is as follows. It is not limited.

One of the inventions related to the disclosed battery pack is that a battery assembly (2) that is an assembly of a plurality of single cells (21) and a cooling fluid that contacts the battery assembly flow or heat of the battery assembly. The battery passage (60) formed so that the cooling fluid that contacts the heat-transferring member flows, the duct portions (13, 14) that form the battery passage, and the cooling fluid is driven for the battery. A fluid drive device (4) that circulates in the passage, and an electrical component container (80) that houses an electrical component (82) that operates during charging or discharging of the battery assembly,
The electrical component container has a heat dissipation surface (800) exposed to the external atmosphere, and the electrical component container is driven by the fluid driving device so that the cooling fluid flowing out of the duct portion contacts the heat dissipation surface. It is provided.

  According to the present invention, since the electrical component container has a heat radiation surface exposed to the outside atmosphere, the heat radiation from the heat radiation surface is discharged to the outside by natural convection even when the cooling fluid does not flow out of the duct portion. Can do. On the other hand, when the cooling fluid flows out from the duct portion, the cooling fluid cools the battery assembly as it flows through the battery passage, and then contacts the heat radiating surface. Can be discharged to the outside. As described above, the heat generated from the electrical components is discharged by natural convection when the fluid driving device is stopped, and is discharged by forced convection when the fluid driving device is operating. Therefore, regardless of the operating state of the fluid drive device, it is possible to discharge the heat of the electrical component to the outside, and it is possible to avoid the heat generation of the electrical component from being trapped inside even when the fluid drive device is stopped. As described above, according to the present invention, since heat generated from the electrical components can be released to the outside even in a situation where no forced cooling flow is generated, the cooling performance of the battery and the electrical components can be improved and the operation time of the fluid drive device can be suppressed. A battery pack can be provided.

It is a perspective view of the battery pack which concerns on 1st Embodiment. It is a side view of the battery pack of 1st Embodiment which looks at the upstream surface of a component case from the front. It is a block diagram regarding control of a battery pack. It is a partially broken perspective view of a battery pack. It is sectional drawing which looked at the virtual cross section in FIG. 4 in the V direction. It is sectional drawing which looked at the virtual cross section in FIG. 4 in VI direction. It is a partial side view which shows the position of the electrical component in a component case. It is a perspective view of the battery pack which concerns on 2nd Embodiment. It is the side view which looked at the upstream surface of the component case from the front about the battery pack of 2nd Embodiment. It is a perspective view of the battery pack which concerns on 3rd Embodiment. It is the side view which looked at the upstream surface of the component case from the front about the battery pack of 3rd Embodiment. It is a perspective view of the battery pack which concerns on 4th Embodiment. About the battery pack of 4th Embodiment, it is the side view which looked at the upstream surface of the component case from the front. It is a perspective view of the battery pack which concerns on 5th Embodiment. About the battery pack of 5th Embodiment, it is the side view which looked at the upstream surface of the component case from the front. It is the side view which looked at the downstream side surface of a component case front about the battery pack of 5th Embodiment. It is a perspective view of the battery pack which concerns on 6th Embodiment. About the battery pack of 6th Embodiment, it is the side view which looked at the upstream surface of the component case from the front. It is the side view which looked at the downstream side surface of a component case front about the battery pack of 6th Embodiment.

  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)
1st Embodiment which is one Embodiment of this invention is described with reference to FIGS. The battery pack according to the first embodiment is a device that can cool the plurality of single cells 21 and the electrical component 82. The battery pack can be applied to various types of electric equipment on which a plurality of unit cells 21 are mounted. Various electric devices are, for example, a device having a storage battery, a computer, a vehicle, and the like. In the first embodiment, as an example, a case where the battery pack is used for a vehicle such as a hybrid vehicle that uses a combination of an internal combustion engine and a battery-driven motor as a travel drive source, and an electric vehicle that travels by a battery-driven motor is described. To do. The battery pack can cool a battery serving as a driving power source for the traveling motor and electric parts related to battery control.

  The battery pack 1 includes a battery stack 2 that is a battery assembly of a plurality of single cells 21, a battery passage 60 through which air comes into contact with the heat conduction plate 22 and the fins 221 for heat dissipation, and a blower for blowing air. 4 and a junction box 8. Furthermore, the battery pack 1 includes a pack case 10, a laminate case 30, an end plate 50, a component case 80, and the like as components that form an outer shell. The battery stack 2, the stack case 30, the end plate 50, the battery passage 60 and the like are covered with the pack case 10. The battery pack 1 is disposed, for example, under a car seat, in a space between a rear seat and a trunk room, a space between a driver seat and a passenger seat, and the like.

  The pack case 10 has a rectangular parallelepiped shape including a bottom wall 11, a top wall 12, a side wall 13, a side wall 14, and the like. The bottom wall 11 and the top wall 12 are walls facing each other in the vertical direction with a space therebetween, and are connected via a side wall 13 and a side wall 14 that intersect in the lateral direction with a space therebetween. The pack case 10 is a housing that houses the battery stack 2, the stack case 30, the blower 4, and the end plate 50 in an internal space surrounded by the bottom wall 11, the top wall 12, the side wall 13, and the side wall 14. . Each of the bottom wall 11 and the top wall 12 is formed with a through hole 16 through which a shaft 15 for integrally fixing the bottom wall 11, the top wall 12, the side wall 13, and the side wall 14 passes.

  The battery stack 2 includes a plurality of single cells 21 and a heat conductive plate 22. The unit cell 21 is a secondary battery such as a nickel hydrogen secondary battery, a lithium ion secondary battery, or an organic radical battery. The unit cell 21 has, for example, a flat plate shape with a thin outer case, and the outer case is formed of a laminate sheet. The laminate sheet is made of a highly insulating material. The unit cell 21 has, for example, an internal space of a flat container that is hermetically sealed by sealing the ends of the laminate sheet that is folded in half by heat-sealing the ends. The internal space contains a battery body including an electrode laminate, an electrolyte, a terminal connection, a part of the positive terminal, and a part of the negative terminal. Therefore, the plurality of single cells 21 are housed in a sealed state in the flat container by sealing the periphery of the flat container. Each unit cell 21 has a pair of electrode terminals 23 drawn outward from the flat container. The pair of electrode terminals 23 includes a positive electrode terminal 231 and a negative electrode terminal 232. The positive electrode terminal 231 and the negative electrode terminal 232 protrude from one end face located at an end portion in a direction orthogonal to the stacking direction of the unit cells 21 in the flat container. For example, the positive terminal 231 is an aluminum terminal, and the negative terminal 232 is a copper terminal. The stacking direction is also the vertical direction.

  As shown in FIG. 6, the plurality of unit cells 21 are stacked in the stacking direction with the heat conduction plate 22 interposed between the upper and lower unit cells 21. A pair of positive terminals 231 and negative terminals 232 are arranged in the stacking direction between the unit cells 21 adjacent in the stacking direction. That is, one positive electrode terminal 231 and the other negative electrode terminal 232 of the unit cells 21 adjacent in the stacking direction face each other. In this case, by connecting one positive electrode terminal 231 and the other negative electrode terminal 232 with a bus bar or the like between adjacent unit cells 21, a plurality of unit cells 21 arranged in the stacking direction are connected in series. For example, a double-sided adhesive type adhesive tape is interposed between the adjacent unit cells 21, and the adjacent unit cells 21 are integrally bonded by adhesion using this adhesive tape.

  The positive electrode terminal 231 and the negative electrode terminal 232 that are electrically connected to each other are overlapped by being bent so as to be close to each other, and are joined to each other at an overlapping portion. The joining method is, for example, connection by screw tightening or joining by ultrasonic welding.

  The heat conduction plate 22 is a plate-like member made of a material having good thermal conductivity such as aluminum, and transmits heat generated by energization of the battery stack 2 to the cooling fluid flowing through the battery passage 60. Take a role. As shown in FIG. 6, the heat conductive plate 22 protrudes from the outer shape of the unit cell 21 in the lateral direction. The end portion of the heat conductive plate 22 protrudes so as to be exposed to the linear passage 63 that constitutes a part of the battery passage 60. The heat conducting plate 22 does not exist in the outlet passage 64 downstream of the battery passage 60. The heat conductive plate 22 protrudes from the unit cell 21 in a direction orthogonal to both the stacking direction and the protruding direction (depth direction) of the electrode terminal 23. The depth direction of the battery pack 1 is a flow-down direction in which the cooling fluid flowing through the battery passage 60 flows down, and is also the longitudinal direction of the battery pack 1.

  A plurality of fins 221 that increase the heat exchange area, that is, the surface area that can come into contact with the cooling fluid, are provided at the end of the heat conducting plate 22. The fins 221 are provided on the portion of the heat conducting plate 22 that protrudes from the battery passage 60. As the fin 221, for example, a corrugated fin or a cut-and-raised fin can be adopted. In the first embodiment, five fins 221 form one fin group, and eight heat conductive plates 22 are provided in eight groups. The intervals between the fin groups are equal. In the process of flowing down the battery passage 60, the cooling fluid contacts the fins 221 and absorbs heat from the fins 221 to cool each unit cell 21.

  As shown in FIGS. 5 and 6, the laminate case 30 is configured by laminating a plurality of case blocks 31 that are hollow resin members in the laminating direction. By stacking the plurality of case blocks 31 in the stacking direction, the battery stack 2 is disposed in an internal space formed by stacking the hollow portions of the case blocks 31. The thickness of each case block 31 is slightly smaller than the thickness of one unit cell 21 in the stacking direction. This is to ensure a space for allowing the heat conducting plate 22 to penetrate from the internal space where the battery stack 2 is disposed to the battery passage 60.

  The fins 221 are insulated from the internal space of the multilayer case 30 in which the battery stack 2 is accommodated, but are thermally connected to the battery stack 2 via the heat conductive plate 22. The fins 221 are present in the battery passage 60 that is cut off from the internal space of the multilayer case 30, and constitute a heat radiating portion through which heat generated by the battery multilayer 2 is transmitted.

  As shown in FIG. 5, the case block 31 protrudes outward at right angles to the stacking direction at block corners 311 continuously formed so as to cover the hollow portion from four directions, and at the four corners of the block sidewall 311. And a protruding portion 312 formed as described above.

  Each protrusion 312 is formed with a through-hole 313 that penetrates in the stacking direction. For example, a rod-shaped fixing member 314 having a male screw portion is inserted into the through hole 313, and the fixing member 314 is nut-tightened, whereby the plurality of case blocks 31 are integrally restrained. Further, the fixing member 314 is inserted into the through hole 521 formed in the plate rib portion 52 of the end plate 50, and the end plate 50 and the plurality of case blocks 31 are integrally restrained. Moreover, the block side wall 311 and the protrusion 312 are integrally formed.

  The end plates 50 are metal plate-like members disposed at both ends of the plurality of unit cells 21 that are stacked in the stacking direction. Further, when viewed from the stacking direction, the outer shape of the end plate 50 is larger than the projected area of the plurality of single cells 21. The end plate 50 includes a plate main body portion 51 and a plate rib portion 52. The plate main body 51 is a portion arranged in a region overlapping with the projection surfaces of the plurality of single cells 21 when viewed in the stacking direction. That is, this projection surface has a size that overlaps the hollow portion of the case block 31 when viewed in the stacking direction.

  The plate rib portion 52 is a portion protruding from the plate main body portion 51 in a direction orthogonal to the stacking direction. The plate rib portion 52 is formed so as to protrude from the four corners of the plate main body portion 51. Two plate rib portions 52 protrude from one side of the plate body portion 51, and two protrude from one side located on the opposite side in the depth direction. In a state where the plurality of stacked unit cells 21 are disposed so as to cover the stacking direction, the plate rib portion 52 is disposed so as to face the protruding portion 312. The plate rib portion 52 is formed with a through hole 521 penetrating in the stacking direction. In a state where the plurality of stacked unit cells 21 are arranged so as to cover from the outside in the stacking direction, the through hole 313 and the through hole 521 are provided to face each other in the stacking direction.

  The plate main body 51 plays a role of restraining the battery stack 2 to be compressed by pressing the outermost unit cell 21 in the stacking direction of the stacked unit cells 21 in the stacking direction. The pressing force is given by the fixing member 314. The fixing member 314 is inserted into the through hole 313 and the through hole 521 and has a function of integrating the end plate 50 and the plurality of case blocks 31. The fixing member 314 applies a pressing force in the stacking direction to the battery stack 2 and the stack case 30 via the end plate 50 by being tightened with nuts or the like from both sides in the stacking direction. With this pressing force, the plate body 51 applies a pressing force to the plurality of single cells 21.

  The axial dimension of the fixing member 314 is set to a length that allows the plate body 51 to apply a pressing force to the plurality of unit cells 21 in a state where the fixing member 314 is tightened with a nut. Further, the fixing member 314 may adopt a form such as restraining by a restraining band in addition to a form in which the shaft is nut-tightened.

  Further, among the plurality of unit cells 21 stacked, the unit cell 21 located on the outermost side in the stacking direction and the end plate 50 are in close contact with each other by an adhesive plate. The end plate 50 presses the plurality of unit cells 21 with two overlapped plate members. This is to ensure the rigidity of the end plate 50.

  The blower 4 is an example of a fluid drive device that circulates a fluid that cools the battery stack 2 housed inside the pack case 10 through a battery passage 60 formed inside the pack case 10. For example, air, various gases, water, or a refrigerant can be used as the cooling fluid.

  As shown in FIG. 5, the blower 4 includes a motor 41, a centrifugal fan 42 that is rotationally driven by the motor 41, and a casing 43 that houses the centrifugal fan 42. The casing 43 includes a suction port 431 and a discharge port 432 that communicate with the battery passage 60. The blower 4 is provided at the end of the battery pack 1 on the depth side so as to face the battery stack 2 on the side opposite to the side from which the electrode terminals 23 protrude.

  The centrifugal fan 42, the motor 41, and the suction port 431 are provided at the center of the battery pack 1 in the lateral direction. Each discharge port 432 is provided in the centrifugal direction of the centrifugal fan 42 and outside the centrifugal fan 42, and is connected to the battery passage 60. Further, the discharge ports 432 are respectively provided on both sides of the centrifugal fan 42 in the lateral direction.

  The suction port 431 is a passage that constitutes the suction port of the casing 43 and extends in the rotation axis direction of the centrifugal fan 42. The suction port 431 is a passage through which the fluid sucked from the outside of the pack case 10 by the centrifugal fan 42 first passes inside the pack case 10. Therefore, the fluid sucked in the direction of the rotation axis from the suction port 431 by the suction force of the centrifugal fan 42 changes its direction in the centrifugal direction and flows out from the discharge port 432 to the battery passage 60.

  The wall surface of the casing 43 constituting the discharge port 432 is connected to the outer wall surface of the case block 31 and the inner wall surface of the pack case 10 which are the wall surfaces constituting the battery passage 60. With this configuration, the cooling fluid is configured to smoothly flow from the discharge port 432 to the battery passage 60.

  The motor 41 is formed between two projecting portions 312 arranged in the lateral direction in the case block 31 and is provided in a recessed space that forms a recessed shape when viewed in the stacking direction. The motor 41 is housed in the concave space, and a part of the centrifugal fan 42 is provided outside the concave space. Moreover, the plate rib part 52 and the motor 41 are arrange | positioned on the straight line about the horizontal direction. The centrifugal fan 42 may be a sirocco fan or a turbo fan.

  The battery passage 60 is a passage through which a fluid for cooling the plurality of single cells 21 passes inside the battery pack 1. The battery passage 60 is a space formed between the stacked case block 31 and the pack case 10. The heat generated in each unit cell 21 is transmitted to the end portions of the heat conduction plate 22 protruding to the two battery passages 60 connected to both sides of the centrifugal fan 42, and the cooling fluid is supplied to the heat conduction plate 22. By making contact, the cooling fluid takes heat away from the heat conducting plate 22.

  As shown in FIG. 5, the battery passage 60 includes a curved passage 62, a straight passage 63, and an outlet passage 64. The curved passage 62 is a passage that is located on the downstream side of the discharge port 432 and connected to the discharge port 432, and is a passage adjacent to the protruding portion 312 of the case block 31. The curved passage 62 is a passage that draws a curve that is connected to the discharge port 432 upstream and is connected to the straight passage 63 downstream and bulges outward. The curved passage 62 has a smooth curved shape when viewed in the stacking direction so that the cooling fluid discharged from the discharge port 432 flows smoothly to the linear passage 63.

  The straight passage 63 is an area adjacent to the block side wall 311 of the case block 31. The straight passage 63 is a passage extending in the depth direction along the battery stack 2, and is a passage formed between the side wall 13 or the side wall 14 of the pack case 10 and the block side wall 311. Therefore, the side wall 13, the block side wall 311, the top wall 12, and the bottom wall 11 constitute a duct part that forms the battery passage 60. As described above, the regions where the linear passage 63 and the electrode terminal 23 are arranged are isolated so that the cooling fluid does not contact the electrode terminal 23. Thereby, corrosion etc. of the electrode terminal 23 by the cooling fluid can be prevented. The fins 221 are uniformly arranged from the upstream end to the downstream end in the linear passage 63. Since the curved passages 62 are connected to both sides of the centrifugal fan 42, the straight passages 63 are provided on both sides of the battery stack 2 at both lateral ends of the battery pack 1.

  The outlet passage 64 is a passage connected to the downstream side of the straight passage 63 and is an open passage exposed to the outside. Therefore, the cooling fluid mixes with the atmosphere outside the battery pack 1 when it flows out of the straight passage 63 in the duct portion and reaches the outlet passage 64. The pack case 10 is formed with a fluid outlet 61 that opens in the depth direction. The fluid outlet 61 is an outlet portion in a duct portion for discharging the cooling fluid flowing inside the battery pack 1 to the outside of the pack case 10, and configures an outlet passage 64 downstream from the fluid outlet 61.

  The outlet passage 64 is a passage through which the cooling fluid that has flowed out of the duct portion flows, and is thus a passage that extends along the component case 80 that is the outline of the junction box 8. Therefore, the outlet passage 64 is a passage obtained by extending the straight passage 63 in the fluid flow downward direction.

  Inside the component case 80, an electrical component 82 that generates heat according to the operating state is installed. The component case 80 constitutes an electrical component container. The heat of the electrical component 82 is transmitted to the component case 80 and is radiated to the outside from the surface of the component case 80. The component case 80 is a portion that forms an outline of an end portion in a fluid flow down direction (depth direction) in the battery pack 1 having a box shape. Accordingly, the component case 80 includes an upstream surface 800 positioned on each of the end surfaces on both sides in the lateral direction and a downstream surface 801 adjacent to and intersecting with each upstream surface 800 as a heat radiating surface.

  The upstream surface 800 is one surface of the component case 80 and is located immediately after the fluid outlet 61 and is exposed to the atmosphere outside the battery pack 1 and constitutes a heat radiating surface extending in parallel with the straight passage 63. As shown in FIGS. 1 and 2, when the cooling fluid is not forced to flow, the heat in the component case 80 is transferred to the upstream surface 800 and then transferred upward on the upstream surface 800. , And discharged from the upper part of the upstream surface 800 to the outside by natural convection. In this case, the heat radiation promoted by the natural convection action is performed not only on each upstream surface 800 but also on the downstream surface 801 exposed to the outside at the depth side end of the battery pack 1.

  On the other hand, when the cooling fluid is forcibly flowing, the cooling fluid comes into contact with each upstream surface 800, so heat is taken from each upstream surface 800. That is, when there is a forced flow of the cooling fluid, heat is radiated from the two upstream surfaces 800 by the forced convection action, and heat is radiated from the downstream surface 801 by the natural convection action. In addition, the electrical component 82 can be cooled.

  As described above, when there is no cooling air, the battery pack 1 radiates heat by natural convection from the three surfaces of the two upstream surfaces 800 and the downstream surface 801. When there is cooling air, heat is radiated by forced convection on the two upstream surfaces 800, and heat is radiated by natural convection on the downstream surface 801. Therefore, the battery pack 1 realizes to release the heat of the electrical component 82 to the outside regardless of the state of the blower 4 being stopped or operating.

  As shown in FIG. 7, the electrical component 82 is preferably installed so as to be positioned below the center in the vertical direction inside the component case 80. That is, it is preferable that the electrical component 82 is installed in the lower part inside the component case 80. According to this height position, when the heat of the electrical component 82 moves along the wall of the component case 80, for example, the upstream surface 800 and the downstream surface 801, the heat transfer distance can be set long. is there. Furthermore, according to the height position of the electrical component 82, the surface area of the wall that can be used as a heat dissipation path can be increased, which can contribute to enhancing the heat dissipation effect.

  The junction box 8 has an electrical component 82 that is electrically connected to the battery stack 2 and is involved in current control inside the component case 80. The electrical component 82 includes various relay devices, a precharge resistor 823, a fuse 85, and the like illustrated in FIG. 3 which is a connection diagram regarding the electrical component 82 and the battery stack 2.

  As illustrated in FIG. 5, components housed in a component case 80 that forms the junction box 8 are a circuit board 81, an electrical component 82, and a heat transfer member 83. The electrical component 82 is mounted on the circuit board 81. The circuit board 81 is fixed to a wall forming the component case 80 by a screw tightening structure or the like. A heat transfer member 83 is interposed between the circuit board 81 and the wall of the component case 80, and the heat transfer member 83 is sandwiched between the circuit board 81 and the wall of the component case 80 and is in close contact with both surfaces. Yes. The component case 80 is formed of a metal or other material having excellent thermal conductivity such as aluminum, copper, or an alloy thereof. As the heat transfer member 83, silicon-based rubber, grease, resin, ceramics, or the like having thermal conductivity can be used. The heat transfer member 83 can be formed by vapor deposition, coating, integral molding, or the like.

  Therefore, the heat of the electrical component 82 is transmitted to the upstream surface 800 of the component case 80 via the circuit board 81, the heat transfer member 83, and the component case 80. The electrical component 82 mounted on the circuit board 81 is, for example, a relay device, a converter device, an inverter device, a resistor, a power element, or the like.

  The relay device is a device that controls the flow of current with respect to the plurality of single cells 21, and a mechanical (contact type) relay device or a semiconductor relay in which an output unit is formed of a semiconductor can be employed. The junction box 8 houses at least one of a positive main relay, a negative main relay, and a precharge relay, which are relay devices. In the first embodiment, the relay devices housed in the component case 80 are a main relay 820 on the positive electrode side, a main relay 821 on the negative electrode side, and a precharge relay 822.

  Devices electrically connected to the plurality of single cells 21 are a main relay 820, a main relay 821, a precharge relay 822, a precharge resistor 823, a fuse 85, and a current sensor 86. Further, a positive input terminal 870, a positive output terminal 871, a negative input terminal 872, and a negative output terminal 873 are electrically connected to the plurality of single cells 21. The output terminal 871 is located on the positive electrode side of the battery stack 2 and is connected to, for example, an inverter device. The output terminal 873 is located on the negative electrode side of the battery stack 2 and is connected to, for example, an inverter device. The input terminal 870 is a connection terminal that connects the positive electrode side of the battery stack 2 and the junction box 8. The input terminal 872 is a connection terminal that connects the negative electrode side of the battery stack 20 and the junction box 8.

  Further, in the case of the battery pack 1 of high voltage specification, a service plug that connects between predetermined connection terminals, that is, between two predetermined single cells 21 may be installed in the plurality of single cells 21. This service plug is a pull-out type plug that is attached so as to connect predetermined connection terminals, and can make the cells 21 located on both sides of the service plug non-conductive and conductive. For example, the service plug is a non-energized switch that is operated at the time of maintenance, and a non-conducting state where current does not flow if the plug is removed can be visually observed from the outside, and the battery stack 2 can be forcibly cut off. it can.

  The main relay 820 is connected to the positive electrode side of the battery stack 2 via a bus bar, and is connected to the output terminal 871 on the opposite side via the bus bar. Between the total terminal (input terminal 870) on the positive electrode side of the battery stack 2 and the main relay 820, a fuse 85 and a current sensor 86 connected via a bus bar are provided. The current sensor 86 is disposed at a location where the bus bar can penetrate the detection core portion of the current sensor 86.

  The precharge relay 822 and the precharge resistor 823 are connected in series via a bus bar. The precharge relay 822 and the precharge resistor 823 are connected in parallel with the main relay 821. The common connection portion of the main relay 821 and the precharge relay 822 is connected to the negative terminal (input terminal 872) on the negative electrode side of the battery stack 2 via a bus bar. A common connection portion of the main relay 821 and the precharge resistor 823 is connected via a bus bar. In this way, the various components are electrically connected to other components by the bus bar. When these main relays are turned on, the entire battery stack 2 is energized, and when turned off, the entire battery stack 2 is de-energized.

  The main relays 820 and 821, the precharge relay 822, the precharge resistor 823, the fuse 85 and the current sensor 86 are provided inside the component case 80 that forms the junction box 8. The battery management unit 7 (Battery Management Unit) is a device that manages at least the amount of electricity stored in the battery stack 2, and is an example of a battery control unit that performs control related to the battery stack 2.

  In addition, the battery management unit 7 may be a device that monitors current, voltage, and temperature related to the battery stack 2 and manages an abnormality of the battery stack 2, an electric leakage abnormality, and the like. The battery management unit 7 is configured to be able to communicate with various electronic control devices mounted on the vehicle. A signal related to the current value detected by the current sensor 86 is input to the battery management unit 7. Further, the battery management unit 7 may be a control device that controls the operation of the main relays 820 and 821 and the precharge relay 822. Further, the battery management unit 7 can function as a device that controls the operation of the motor of the blower 4.

  For example, the unit cell 21 self-heats at the time of output when discharging and taking out current and at the time of input when charging. The battery management unit 7 constantly monitors the temperature of the unit cell 21 and controls the operation of the blower 4 based on the temperature of the unit cell 21. For example, the battery management unit 7 applies a voltage controlled to a duty ratio of an arbitrary value included in 0% to 100% with respect to the maximum voltage to the motor of the blower 4 to vary the rotation speed of each fan. Let In the battery pack 1, the air volume by the blower 4 can be adjusted in multiple steps or steplessly by changing the rotation speed of the fan by this duty control.

  Next, the flow of the cooling fluid will be described. Fluid is introduced into the battery pack 1 in the depth direction from the outside of the pack case 10 through the suction port 431 by the centrifugal fan 42 that is rotationally driven by the motor 41. The fluid changes its flow direction to the centrifugal direction (lateral direction) by the centrifugal fan 42 and further flows into each of the battery passages 60 located on both sides of the battery stack 2 from each discharge port 432.

  In the process of flowing through the curved passage 62, the fluid discharged from the discharge port 432 starts to flow in the lateral direction and further changes direction in the depth direction. The fluid that has flowed through the curved passage 62 then flows down the straight passage 63 in the depth direction. In this process, the heat generated from each unit cell 21 is radiated by the fluid contacting the fins 221 formed on the heat conductive plate 22. The fluid flowing down while contacting the fins 221 flows out to the outlet passage 64 and further flows while contacting the upstream surface 800 of the component case 80. By repeating this series of flows, the heat of each unit cell 21 and the heat of the electrical component 82 are radiated to the outside of the pack case 10. In the battery pack 1, the straight passage 63 is on the upstream side, and the outlet passage 64 is on the downstream side. That is, the fluid exchanges heat with the battery body 24 first, and then exchanges heat with the component case 80.

  Next, effects obtained by the first embodiment will be described. The battery pack 1 is formed such that a cooling fluid flows so as to contact the battery stack 2 and the battery stack 2, or a cooling fluid that contacts a member to which heat of the battery stack 2 is thermally transferred flows. A battery passage 60 and a duct portion that forms the battery passage 60. The battery pack 1 further includes a blower 4 that drives a cooling fluid to flow through the battery passage 60 and a component case 80 that houses an electrical component 82 that operates when the battery stack 2 is charged or discharged. . The component case 80 has a heat radiating surface exposed to the outside atmosphere, and the component case 80 is provided so that the cooling fluid that is driven by the blower 4 and flows out of the duct portion contacts the heat radiating surface.

  According to this configuration, the electric component 82 in the junction box 8 can be further cooled after the battery stack 2 is cooled by the cooling fluid driven by the blower 4. Since the component case 80 has a heat radiating surface exposed to the external atmosphere, the heat radiated from the heat radiating surface can be discharged to the outside by natural convection even when the cooling fluid does not flow out of the duct portion. On the other hand, when the cooling fluid flows out from the duct portion, the cooling fluid cools the battery stack 2 when flowing through the battery passage 60 and then contacts the heat radiating surface. It can be discharged to the outside by forced convection.

  Thus, the heat generated from the electrical component 82 is discharged by the natural convection action when the blower 4 is stopped, and is discharged by the forced convection action when the blower 4 is operating. Therefore, regardless of the operating state of the blower 4, the heat generated by the electrical component 82 can be discharged to the outside, and the heat of the electrical component 82 can be prevented from being trapped inside even when the blower 4 is stopped. As described above, according to the battery pack 1, since the heat generated from the electrical component 82 can be released to the outside even in a situation where no forced cooling flow is generated, the cooling performance of the battery stack 2 and the electrical component 82 can be improved, and The operation time of the device 4 can be suppressed.

  According to the battery pack 1, since the cooling fluid cools the electric component 82 after the battery is cooled, the temperature does not rise due to heat absorption first from the electric component 82 that is higher in temperature than the battery and easily generates heat. It is possible to avoid a situation where the ability to cool the stacked body 2 is insufficient. Therefore, the battery stack 2 and the electrical component 82 can be cooled with good balance.

  In addition, when the electrical component 82 is downsized due to the improved cooling performance provided by the battery pack 1, the electrical component 82 may require cooling more frequently than the unit cell 21. In such a battery pack 1 as well, by combining the cooling action by forced convection and the cooling action by natural convection, energy consumption can be suppressed while ensuring cooling performance.

  The relay device included in the electrical component 82 includes a main relay 820 that is a positive side relay of the battery stack 2, a main relay 821 that is a negative side relay of the downstream side passage forming portion, and a precharge relay 822 for precharging. At least one is included. According to this, it is possible to provide the battery pack 1 that can satisfy both of ensuring of cooling performance and suppression of energy consumption for a relay device having a high driving frequency and a large calorific value in battery control. Further, the relay device preferably includes all of a main relay 820 that is a positive side relay, a main relay 821 that is a negative side relay, and a precharge relay 822.

  In addition, when a semiconductor relay is used as the relay device, the electrical component 82 may require cooling more frequently than the unit cell 21. Also in such a battery pack 1, it is possible to achieve both cooling performance and energy consumption suppression by combining the cooling effect by forced convection and the cooling effect by natural convection in a well-balanced manner.

  Further, the battery stack 2 and the junction box 8 are provided side by side in the flow direction (depth direction) of the cooling fluid between the battery passage 60 and the outlet passage 64. According to this configuration, since the size of the battery pack 1 can be suppressed in the height direction and the stacking direction orthogonal to the flow direction, the occupied space in the height direction can be suppressed, and the mounting conditions have height restrictions. Can be provided.

  The battery pack 1 is preferably mounted on a vehicle that uses the electric power stored in the battery stack 2 as travel drive power. In such a vehicle, the electric component 82 is likely to generate heat during acceleration and deceleration. For this reason, according to the battery pack 1, it is possible to provide the electrical component 82 that contributes to extending the service life of the vehicle.

  The upstream surface 800 that is one of the heat radiating surfaces is a surface that is located immediately after the fluid outlet 61 of the cooling fluid in the duct portion and extends along the outflow direction of the cooling fluid that passes through the fluid outlet 61. . According to this, the cooling fluid that has flowed out from the fluid outlet 61 into the outlet passage 64 flows smoothly while contacting the upstream surface 800. Since such a flow can be formed, the flow resistance with the fluid can be reduced while increasing the degree of contact with the fluid, and the heat dissipation performance on the upstream surface 800 can be improved.

(Second Embodiment)
In the second embodiment, a battery pack 101 which is another form of the battery pack 1 of the first embodiment will be described with reference to FIGS. 8 and 9. In FIG. 8 and FIG. 9, the constituent elements having the same reference numerals as those in the drawings of the first embodiment are the same constituent elements and have the same operational effects. Hereinafter, content different from the first embodiment will be described.

  The battery pack 101 is different from the battery pack 1 of the first embodiment in that a heat sink that can promote heat dissipation is provided on the surface of the component case 80. As illustrated in FIGS. 8 and 9, the battery pack 101 includes a plurality of protruding piece portions 9 protruding from the upstream surface 800 as an example of a heat sink.

  The plate-like protruding piece 9 is a heat radiating fin made of a plate material having a shape extending from the upstream surface 800 in the vertical direction (lateral direction) and the flow-down direction (depth direction). The protruding piece 9 has a shape in which both side surfaces thereof, that is, the upper surface and the lower surface are along the flow-down direction. The plurality of protruding piece portions 9 are arranged at intervals in the vertical direction (stacking direction). The plurality of protruding piece portions 9 are provided on the upstream surface 800 over substantially the entire length in the vertical direction and the flow-down direction. Therefore, the cooling fluid that has flowed out of the fluid outlet 61 into the outlet passage 64 flows down in the flow-down direction while being in contact with both side surfaces of each protruding piece 9. Since the plurality of protruding piece portions 9 are provided in such a posture, the flow resistance with the fluid can be reduced while increasing the degree of contact with the fluid, and the heat dissipation performance on the upstream surface 800 can be improved. it can. That is, the plurality of projecting piece portions 9 can increase the heat radiation amount on the upstream surface 800 both during heat radiation by forced convection and during heat radiation by natural convection.

(Third embodiment)
In 3rd Embodiment, the battery pack 201 which is the other form of the battery pack 101 of 2nd Embodiment is demonstrated with reference to FIG.10 and FIG.11. In FIG. 10, FIG. 11, the component which attached | subjected the same code | symbol as drawing of 1st Embodiment and 2nd Embodiment is a similar component, and there exists the same effect. Hereinafter, contents different from the above-described embodiment will be described.

  The battery pack 201 is different from the battery pack 101 of the second embodiment in the shape of the heat sink. As illustrated in FIGS. 10 and 11, the battery pack 201 includes a plurality of protruding piece portions 109 protruding from the upstream surface 800 as an example of a heat sink.

  The plate-like projecting piece 109 is a heat radiating fin made of a plate material that extends obliquely upward and downward from the upstream surface 800. That is, the protruding piece 109 has a shape in which one end 109a on the base side is inclined and positioned above the other end 109b on the tip side. Accordingly, the protruding piece 109 protrudes from the upstream surface 800 so as to be positioned higher toward the tip.

  The protruding piece 109 has a shape in which both side surfaces thereof, that is, the upper surface and the lower surface are along the flow-down direction. The plurality of protruding piece portions 109 are arranged at intervals in the vertical direction (stacking direction). The plurality of protruding pieces 109 are provided on the upstream surface 800 over substantially the entire length in the vertical direction and the flow-down direction. Therefore, the cooling fluid that has flowed out of the fluid outlet 61 into the outlet passage 64 flows down in the flow-down direction while being in contact with both side surfaces of each protruding piece 109. Since the plurality of protruding pieces 109 are provided in such a posture, the flow resistance with the fluid can be reduced while increasing the degree of contact with the fluid. Furthermore, since the heat transferred from the upstream surface 800 to each protruding piece 109 has a higher temperature than the surrounding atmosphere, it easily moves upward. Since each protruding piece 109 protrudes obliquely upward from the upstream surface 800, it is easy to transfer heat to the tip side, and a heat sink with high heat dissipation at the tip can be provided. Therefore, the plurality of protruding pieces 109 can improve the heat radiation amount on the upstream surface 800 both during heat radiation by forced convection and during heat radiation by natural convection.

(Fourth embodiment)
In the fourth embodiment, a battery pack 301 which is another form of the battery pack 101 of the second embodiment will be described with reference to FIGS. 12 and 13. In FIG. 12 and FIG. 13, components given the same reference numerals as those in the drawings of the first embodiment and the second embodiment are similar components and have the same operational effects. Hereinafter, content different from the first embodiment and the second embodiment will be described.

  The battery pack 301 is different in the shape of the heat sink from the battery pack 101 of the second embodiment. Each of the plurality of protruding piece portions 209 protruding from the upstream surface 800 is a plate-like protruding piece portion that is inclined with one end positioned above the other end in the flow direction (depth direction) of the cooling fluid. . The plurality of protruding piece portions 209 includes a plurality of protruding piece portions 209a arranged at intervals in the up-down direction and a plurality of protruding piece portions 209b arranged at intervals in the up-down direction. The plurality of protruding piece portions 209a that are vertically arranged and the plurality of protruding piece portions 209b that are vertically arranged are alternately provided at intervals in the flow-down direction.

  The protruding piece portion 209a is a plate-like protruding piece portion that is inclined such that the downstream end 209a1 positioned on the downstream side is positioned higher than the upstream end 209a2 positioned on the upstream side in the flow-down direction. Therefore, the protruding piece 209a protrudes from the upstream surface 800 so as to be positioned upward as it goes downstream. The protruding piece portion 209b is a plate-like protruding piece portion that is inclined such that the upstream end 209b1 positioned on the upstream side is positioned above the downstream end 209b2 positioned on the downstream side in the flow-down direction. Therefore, the protruding piece portion 209b protrudes from the upstream surface 800 so as to be positioned upward as it goes upstream.

  The plurality of protruding piece portions 209 are provided on the upstream surface 800 over substantially the entire length in the vertical direction and the flow-down direction. Therefore, the cooling fluid that has flowed out of the fluid outlet 61 into the outlet passage 64 first flows obliquely upward between the projecting piece 209a and the projecting piece 209a and proceeds while contacting both side surfaces of the projecting piece 209a. Next, the fluid flows between the protruding piece portion 209b and the protruding piece portion 209b, flows downward obliquely, and proceeds while contacting the both side surfaces of the protruding piece portion 209b. Further, the fluid flows between the projecting piece 209a and the projecting piece 209a, flows down obliquely upward, and advances while contacting both side surfaces of the projecting piece 209a.

  Since the plurality of protruding piece portions 209 are provided in such a posture, the fluid can flow down while reducing the flow resistance while increasing the degree of contact with each protruding piece portion 209 while meandering. Furthermore, since the heat transferred from the upstream surface 800 to each protruding piece 209 has a higher temperature than the surrounding atmosphere, it tends to move upward. In each protrusion piece part 209, it is easy to carry out heat transfer to the edge part located in the upper part, and a heat sink with high heat dissipation in the upper tip part can be provided. Therefore, the plurality of protruding piece portions 209 can improve the heat radiation amount on the upstream surface 800 both during heat radiation by forced convection and during heat radiation by natural convection.

(Fifth embodiment)
5th Embodiment demonstrates the battery pack 401 which is the other form of the battery pack 301 of 4th Embodiment with reference to FIGS. 14-16. 14 to 16, the constituent elements denoted by the same reference numerals as those in the drawings of the above-described embodiments are the same constituent elements and exhibit the same operational effects. The contents different from the fourth embodiment will be described below.

  The battery pack 401 differs from the battery pack 301 of the fourth embodiment in the position of the heat sink. The battery pack 401 includes a heat sink on the downstream surface 801 in addition to the upstream surface 800. The component case 80 in the battery pack 401 includes two upstream surfaces 800 and a downstream surface 801 that are two surfaces that are adjacent and intersect each other as a heat dissipation surface having a heat sink. The protruding piece 209 that is a heat sink constitutes a first protruding piece that protrudes outward from the upstream surface 800, and the protruding piece 309 includes a second protruding piece that protrudes outward from the downstream surface 801. Configure.

  Furthermore, the battery pack 1 includes a guide member 90 that changes the flow direction so that the cooling fluid flowing along the upstream surface 800 further flows to the downstream surface 801. The guide member 90 is provided outward with a gap from a corner formed by the upstream surface 800 and the downstream surface 801. The guide members 90 are provided at both ends of the downstream surface 801 in the lateral direction. Each guide member 90 is a wall having an L-shaped cross section, and is provided over substantially the entire length of the upstream surface 800 and the downstream surface 801 in the vertical direction. Further, each guide member 90 may have a shape in which a curved surface is formed on the inner wall surface through which the cooling fluid flows to smoothly guide the fluid.

  Each guide member 90 can be replaced with a vehicle-side guide member 190 installed as a vehicle-side member. Therefore, the cooling fluid that flows in contact with the upstream surface 800 is changed in flow direction by the vehicle-side guide member 190 and further flows to the downstream surface 801.

  Each of the plurality of protruding piece portions 309 protruding from the downstream surface 801 is a plate-like protruding piece portion inclined with one end positioned above the other end in the flow direction (lateral direction) of the cooling fluid. . The plurality of protruding piece portions 309 includes a plurality of protruding piece portions 309a arranged at intervals in the up-down direction and a plurality of protruding piece portions 309b arranged at intervals in the up-down direction. The plurality of protruding piece portions 309a arranged in a row in the vertical direction and the plurality of protruding piece portions 309b arranged in a row in the vertical direction are alternately provided at intervals in the flow-down direction.

  The protruding piece portion 309a is a plate-like protruding piece portion that is inclined such that the downstream end 309a1 positioned on the downstream side is positioned above the upstream end 309a2 positioned on the upstream side in the flow-down direction. Therefore, the protruding piece 309a protrudes from the downstream surface 801 so as to be positioned upward as it goes downstream. The protruding piece portion 309b is a plate-like protruding piece portion that is inclined such that the upstream end 309b1 positioned on the upstream side is positioned above the downstream end 309b2 positioned on the downstream side in the flow-down direction. Therefore, the protruding piece 309b protrudes from the downstream surface 801 so as to be positioned upward as it goes upstream.

  The plurality of protruding piece portions 309 are provided on the downstream surface 801 over substantially the entire length in the vertical direction and the flow-down direction. Therefore, the cooling fluid whose flow direction has been changed to a right angle by the guide member 90 first flows obliquely downward between the protruding piece 309b and the protruding piece 309b and contacts both side surfaces of the protruding piece 309a. Proceed while proceeding. Next, the fluid flows between the protruding piece portion 309a and the protruding piece portion 309a, flows down obliquely upward, and advances while contacting both side surfaces of the protruding piece portion 309a. Further, the fluid flows between the protruding piece portion 309b and the protruding piece portion 309b, flows down obliquely downward, and advances while contacting both side surfaces of the protruding piece portion 309b. Such a flow is repeated on the downstream surface 801.

  Since the plurality of projecting piece portions 309 are provided in such a posture, the fluid can flow down the downstream surface 801 by reducing the flow resistance while increasing the degree of contact with each projecting piece portion 309 while meandering. Furthermore, since the heat transferred from the downstream surface 801 to each protruding piece 309 has a higher temperature than the surrounding atmosphere, it easily moves upward. In each protruding piece 309, a heat sink can be provided that is easy to thermally move to the end on the upper side and has high heat dissipation at the upper tip. Therefore, the plurality of protruding piece portions 309 can improve the heat radiation amount on the downstream surface 801 both during heat radiation by forced convection and during heat radiation by natural convection.

  According to the battery pack 401 of the fifth embodiment, the provision of the guide member 90 makes it easy for the cooling fluid to flow along the downstream surface 801 from the upstream surface 800, and the upstream surface 800 and the downstream surface 801 Heat dissipation by forced convection can be implemented in two stages. Therefore, the battery pack 401 can improve the heat radiation amount on the surface of the component case 80 both during heat radiation by forced convection and during heat radiation by natural convection.

(Sixth embodiment)
In the sixth embodiment, a battery pack 501 that is another form of the battery pack 401 of the fifth embodiment will be described with reference to FIGS. 17 to 19. In FIG. 17 to FIG. 19, the constituent elements denoted by the same reference numerals as those in the drawings of the above-described embodiments are the same constituent elements and have the same operational effects. The contents different from the fifth embodiment will be described below.

  The battery pack 501 has a different heat sink shape from the battery pack 401 of the fifth embodiment. In the battery pack 501, the plurality of protruding pieces 209 and the plurality of protruding pieces 309 in the battery pack 401 are replaced with protruding pieces 409 having the same shape as the protruding pieces 109 and 109 of the battery pack 201, respectively. It is a thing. The protruding piece 109 constitutes a first protruding piece that protrudes outward from the upstream surface 800, and the protruding piece 409 constitutes a second protruding piece that protrudes outward from the downstream surface 801.

  The plate-like protruding piece portion 409 is a heat radiating fin made of a plate material that extends obliquely upward and downward from the downstream surface 801. In other words, the protruding piece 409 has a shape in which the root-side end 409a is inclined to be positioned above the tip-side other end 409b. Therefore, the protruding piece 409 protrudes from the downstream surface 801 so as to be positioned higher toward the tip.

  The protruding piece portion 409 has a shape in which both side surfaces, that is, an upper surface and a lower surface are along the flow-down direction. The plurality of protruding piece portions 409 are arranged at intervals in the vertical direction (stacking direction). The plurality of protruding piece portions 409 are provided on the downstream surface 801 over substantially the entire length in the vertical direction and the flow-down direction. Therefore, the cooling fluid whose direction of flow is changed to a right angle by the guide member 90 flows down in the flow-down direction (lateral direction) while being in contact with both side surfaces of each protruding piece 409. Since the plurality of protruding piece portions 409 are provided in such a posture, the flow resistance with the fluid can be reduced while increasing the degree of contact with the fluid. Furthermore, since the heat transferred from the downstream surface 801 to each protruding piece 409 has a higher temperature than the surrounding atmosphere, it easily moves upward.

  Since each protruding piece 409 protrudes obliquely upward from the downstream surface 801, it is easy to thermally move to the tip side, and a heat sink with high heat dissipation at the tip can be provided. Therefore, the plurality of protruding pieces 109 can improve the heat radiation amount on the upstream surface 800 both during heat radiation by forced convection and during heat radiation by natural convection.

  According to the battery pack 501 of the sixth embodiment, the provision of the guide member 90 makes it easy for the cooling fluid to flow from the upstream surface 800 along the downstream surface 801, and the upstream surface 800 and the downstream surface 801 Heat dissipation by forced convection can be implemented in two stages. Therefore, the battery pack 501 can improve the heat radiation amount on the surface of the component case 80 both during heat radiation by forced convection and during heat radiation by natural convection.

(Other embodiments)
The preferred embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention. The structure of the said embodiment is an illustration to the last, Comprising: The scope of the present invention is not limited to the range of these description. The scope of the present invention is indicated by the description of the scope of claims, and further includes meanings equivalent to the description of the scope of claims and all modifications within the scope.

  In the above-described embodiment, the relay device is disclosed as being electrically connected to other components and terminals by a bus bar, but may be connected by wiring such as a lead wire.

  In the above-described embodiment, the unit cells 21 constituting the battery stack 2 can be configured by rectangular unit cells. The unit cell 21 may be a flat rectangular parallelepiped whose outer peripheral surface is covered with an exterior case made of aluminum, an aluminum alloy, or the like. In this case, the battery stack 2 is a unitary structure in which a predetermined number of cells 21 and insulating spacers alternately stacked are sandwiched by restraining members from both ends in the stacking direction, and an inward restraining force is applied. Can be.

  In the above-described embodiment, the battery passage 60 is a passage through which the cooling fluid contacts the heat conductive plate 22 and the fins 221 through which the heat of the battery stack 2 moves, but the cooling fluid is the battery stack. You may comprise the battery pack 1 provided with the channel | path for batteries which flows so that the body 2 may be contacted.

  In the above-described embodiment, the battery passage 60 is an area formed between the stacked case block 31 and the pack case 10, but may be a passage formed inside a dedicated duct.

  In the above-described embodiment, the battery passage 60 is formed with a wall portion extending in the depth direction between the side wall 13 and the side wall 14 and the multilayer body case 30, and is surrounded by the multilayer body case 30 and the wall portion. The space to be provided may be a battery passage 60. That is, the wall surface of the pack case 10 may not be the wall surface that forms the battery passage 60.

  In the above-described embodiment, the battery stack 2 is one battery stack, but may be, for example, two or more battery stacks arranged in the fluid flow downward direction.

  In the above-described embodiment, the plurality of unit cells 21 constituting the battery stack 2 may be installed in the accommodation space of the stack case 30 in a state where the unit cells 21 are in contact with each other without providing a gap. Alternatively, it may be installed with a predetermined gap between the cells.

  In the above-described embodiment, the stacking direction of the plurality of single cells 21 constituting the battery stack 2 may be a fluid flow direction or a lateral direction.

2 ... Battery stack (battery assembly)
4 ... Blower (fluid drive)
13, 14 ... Side wall (duct part)
21 ... Single cell 60 ... Battery passage 80 ... Part case (electric part container)
82 ... Electrical components 800 ... Upstream surface (surface for heat dissipation)

Claims (8)

A battery assembly (2) which is an assembly of a plurality of single cells (21);
A battery passage (60) formed so that a cooling fluid in contact with the battery assembly flows or a cooling fluid in contact with a member to which heat of the battery assembly is thermally transferred flows;
Duct portions (13, 14) forming the battery passage;
A fluid drive device (4) for driving a cooling fluid to flow through the battery passage;
An electrical component container (80) that houses an electrical component (82) that operates during charging or discharging in the battery assembly;
With
The electrical component container has a heat dissipating surface (800) exposed to an external atmosphere,
The battery pack, wherein the electrical component container is provided such that a cooling fluid that is driven by the fluid driving device and flows out of the duct portion contacts the heat radiating surface.   The heat radiating surface is a surface that is located immediately after the cooling fluid outlet portion (61) in the duct portion and extends along the outflow direction of the cooling fluid that passes through the outlet portion. The battery pack according to claim 1. The heat dissipating surface includes two surfaces that are adjacent and intersect each other;
The direction of the flow is changed so that the cooling fluid flowing along the upstream surface (800) located on the upstream side of the two surfaces flows further on the downstream surface (801) located on the downstream side. The battery pack according to claim 1 or 2, further comprising a guide member (90). The heat dissipating surface includes two surfaces that are adjacent and intersect each other;
The direction of the flow of the cooling fluid flowing in contact with the upstream surface (800) located on the upstream side of the two surfaces is changed by the vehicle side guide member (190) installed as a vehicle side member. The battery pack according to claim 1, further flowing to a downstream surface (801) located further downstream.   3. The battery pack according to claim 1, wherein the electrical component container has a heat sink (9, 109, 209, 309) that protrudes outward from the heat radiating surface.   6. The battery pack according to claim 5, wherein the heat sink is a plate-like projecting piece portion in which one end (109 a) on the base side is located above the other end (109 b) on the front end side.   6. The battery pack according to claim 5, wherein the heat sink is a plate-like projecting piece portion in which one end (209 a 1) is located above the other end (209 a 2) in the flow-down direction of the cooling fluid. .   The electrical component container includes a first protruding piece portion (209) protruding outward from the upstream surface and a second protruding piece portion (309) protruding outward from the downstream surface. The battery pack according to claim 3 or 4, wherein the battery pack is characterized by that.

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