JP2016119286A - Battery pack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery pack capable of improving efficiency of heat dissipation to an inner wall surface of a housing.SOLUTION: A battery pack 1 comprises: a plurality of battery cells 7; a case 2 in which the plurality of battery cells are accommodated; an air blower 4 which is accommodated within the housing and circulates a fluid within the housing; and a connection wall side passage 50 in which the fluid flows between a connection wall part 22 that configures the inner wall surface of the housing, and the battery cells. In the connection wall part, a first fin 221 is formed for exchanging heat between the fluid and the connection wall part. The connection wall side passage is divided into a first region 501 that is a space in which the first fin is disposed, and a second region 502 that is a space in which the first fin is not formed. The first fin 221 is formed so as to extend from an inflow port 223 through which the fluid flows into the first region, to an outflow port 224 through which the fluid flows out of the first region. An area of the inflow port is larger than a cross-sectional area of a first flow passage in a view in a flow direction of the fluid.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a battery pack having a plurality of battery cells housed inside a case.

  Conventionally, as a battery pack having a battery cell, for example, a battery pack described in Patent Document 1 is known. The battery pack described in Patent Document 1 can cool a battery cell that has generated heat by circulating a fluid inside a housing that houses a plurality of battery cells and removing heat from the battery cell.

JP 2009-211829 A

  In the battery pack described in Patent Document 1, in order to take away heat from the battery cell in the process of circulation of the cycled fluid again, the fluid once received from the battery cell needs to radiate heat to the inner wall surface of the casing. . For example, as in the comparative example shown in FIG. 10, by forming the fins 10 in the entire region of the fluid passage in parallel with the fluid flow direction, the heat radiation area between the fluid flowing along the inner wall surface and the inner wall surface is reduced. Can be increased. Hereinafter, the configuration of FIG. 10 is referred to as a comparative example. Here, the amount of heat radiated from the fluid to the inner wall surface is proportional to the temperature difference between the fluid and the outside air as well as the heat radiating area. In this regard, in region C in FIG. 10, the temperature difference between the fluid and the inner wall surface is sufficiently large, and thus the amount of heat released is large. However, when the fluid flows between the fins 10, the heat of the fluid is taken away by the fins 10, so that the temperature difference between the fluid and the outside air is reduced in the region D, and a sufficient heat radiation amount by the fins 10 can be secured. Not. That is, although the fin 10 in the region D has a heat radiation area equivalent to that of the fin 10 in the region C, a difference in the heat radiation amount is generated and the heat radiation efficiency is poor.

  This invention is made | formed in view of the said problem, and it aims at providing the battery pack which can improve the thermal radiation efficiency to the inner wall surface of a housing | casing.

  A battery pack (1) according to a first aspect of the present invention includes a plurality of batteries (7), a housing (2) that houses a plurality of batteries, and a battery that is housed inside the housing. A fluid circulation means (4) for circulating a fluid for cooling in the housing, a first fluid passage (50) through which a fluid flows between the battery and the first inner wall surface (22) constituting the inner wall surface of the housing. ), And the first inner wall surface is formed with first fins (221, 151) for exchanging heat between the fluid and the first inner wall surface. It is divided into a first region (501) that is a space in which fins are arranged and a second region (502) that is a space in which no first fins are formed, and fluid flows from the second region to the first region. In the first fin, the fluid flows out from the first region from the inlet (223) through which the fluid flows into the first region. Is formed so as to extend to the outlet (224), the area of the inlet port is greater than the cross-sectional area of the first fluid passage viewed in the flow direction of the fluid.

  According to the battery pack of the first invention, the area of the inlet is larger than the cross-sectional area of the first fluid passage in the fluid flow direction. That is, in the present invention, the area of the inflow port through which the fluid flows into the first region is larger than that of the comparative example. Therefore, a larger number of fins than in the comparative example can be formed, and a fluid having a high temperature supplied from the fluid driving means can flow into any fin. Therefore, a fluid having a sufficient temperature difference with the outside air can flow into any fin. Therefore, if a heat radiation area equivalent to the comparative example can be secured by increasing the number of fins, the comparative example The heat dissipation efficiency can be improved compared to

  A battery pack according to a second invention which is one of the present inventions circulates a plurality of batteries (7), a casing (2) containing the plurality of batteries, and a fluid for cooling the batteries in the casing. A passage formed between the blower (4), the inner wall surface (22) of the housing and the battery, a fluid passage (50) extending in a predetermined direction along the inner wall surface, and from the inner wall surface to the fluid passage A plurality of projecting fins (221, 151) and a blower duct (46) connected to the blower and having a blower outlet (46a) for blowing out the fluid blown from the blower to the fluid passage, An inflow formed by the upstream ends of the plurality of fins, which is configured to extend along the inner wall surface in a direction intersecting the direction and is arranged in a direction in which the fluid is blown out in a predetermined direction. Inflow with respect to the surface (503) Configured so that.

  According to the battery pack of the second aspect of the invention, the air outlet has a shape extending along the inner wall surface in a direction intersecting the predetermined direction (passage width direction) and is arranged in a direction in which the fluid is blown out in the predetermined direction. Has been. Therefore, the fluid flows in a predetermined direction over the entire passage width direction in the portion of the fluid passage located upstream of the fins. And the fluid which flowed in this way flows in diagonally with respect to the inflow surface of a fin after that. Therefore, if the fins are formed so that the fluid flowing between the fins is inclined with respect to the predetermined direction, the fin pitch is the same as the fin pitch according to the comparative example (FIG. 10), but more than the comparative example. The number of fins can be formed.

  Here, since the temperature difference between the fluid and the outside air is large in the upstream portion of the fins, the heat radiation amount per unit area is large, and the heat radiation efficiency is good. On the other hand, in the downstream part of the fins, the heat dissipation efficiency is worse than that in the upstream part. When paying attention to this point, in the second invention, since the number of fins can be increased as described above, it is possible to increase the portion with good heat dissipation efficiency. Therefore, when the total area of the plurality of fins is the same as that of the comparative example, the heat radiation amount can be increased as compared with the comparative example. That is, the heat radiation efficiency can be improved by increasing the number of fins.

  Note that the reference numerals in parentheses in the scope of claims are intended only to exemplify corresponding configurations in the embodiments described later in order to facilitate understanding of the description, and are not intended to limit the content of the invention. Absent.

The schematic diagram seen from the top wall side for demonstrating the structure of the battery pack of 1st Embodiment, and the flow of the fluid in a case II-II sectional view in FIG. FIG. 1 is a schematic diagram illustrating the first heat exchange passage portion in FIG. 1 with the connection wall portion removed from the view in the direction of arrow III in FIG. The schematic diagram seen from the top wall side for demonstrating the 2nd heat exchange channel | path part in 2nd Embodiment. FIG. 4 is a schematic view in which the connecting wall portion and the first heat exchange passage portion are removed from the view of the arrow VI in FIG. The schematic diagram which removed the connection wall part from the VI arrow figure in FIG. 4 for demonstrating the 1st heat exchange channel | path part in FIG. Schematic for demonstrating the flow of the fluid in a 1st heat exchange channel | path part and a 2nd heat exchange channel | path part in 2nd Embodiment. Explanatory drawing of other embodiment Explanatory drawing of other embodiment Schematic view seen from the connection wall side for explaining the formation mode of the heat dissipation fin in the comparative example The disassembled perspective view which shows the case and internal fin which concern on 3rd Embodiment The perspective view which shows the case and external fin which concern on 3rd Embodiment The perspective view which shows the case and external duct which concern on 3rd Embodiment The perspective view which shows the external fin which concerns on 3rd Embodiment Sectional drawing which shows typically the positional relationship of an internal fin range and an external duct range in 3rd Embodiment In 3rd Embodiment, the front view which shows typically the positional relationship of an internal fin range and an external duct range The perspective view which shows the flow of the fluid by an internal fin in 3rd Embodiment. The perspective view which shows the flow of the fluid by an external fin in 3rd Embodiment. Sectional drawing which shows typically the positional relationship of an internal fin range and an external duct range in 4th Embodiment In 4th Embodiment, the front view which shows typically the positional relationship of an internal fin range and an external duct range Sectional drawing which shows typically the positional relationship of an internal fin range and an external duct range in 5th Embodiment In 5th Embodiment, the front view which shows typically the positional relationship of an internal fin range and an external duct range

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. The battery pack 1 shown in FIG. 1 and FIG. 2 includes, for example, a hybrid vehicle using a motor driven by electric power charged in a battery and an internal combustion engine as a travel drive source, an electric vehicle using a motor as a travel drive source, Used for. The battery pack 1 includes a case 2, a plurality of battery stacks 3, a blower 4, a fluid passage 5, and a collective duct 8.

  The case 2 has a blower side wall portion 20, an anti-blower side wall portion 21, two connection wall portions 22 and 23, a top wall 24, and a bottom wall 25. Hereinafter, these 20 to 25 are collectively referred to as “6 wall surfaces”. The blower side wall portion 20 is a wall adjacent to the blower 4 described later. The anti-blower side wall portion 21 is a wall formed on the side opposite to the blower 4 via a plurality of battery cells 7 described later. The two connection walls 22 and 23 are walls that connect the blower side wall 20 and the anti-blower side wall 21. That is, four directions are covered with the blower side wall part 20, the anti-blower side wall part 21, and the two connection wall parts 22 and 23 to form a space (hereinafter referred to as a first space). The two connecting walls 22 and 23 have a short side in the up-down direction in FIG. 1 and a long side in the front-rear direction. The top wall 24 is a wall surface that closes the first space from the upper side in FIG. 2. The bottom wall 25 is a wall surface that closes the first space from the lower side in FIG. That is, the case 2 has a box shape composed of six wall surfaces. A plurality of battery stacks 3 and a blower 4 described later are accommodated in a space surrounded by the six wall surfaces. Case 2 is formed of a molded product of an aluminum plate or an iron plate. Case 2 corresponds to a “housing” in the claims.

  The plurality of battery stacks 3 include a plurality of battery cases 6 and a plurality of battery cells 7. A plurality of battery stacks 3 are arranged side by side in a direction from the blower side wall 20 to the anti-blower side wall 21 with a predetermined interval. Hereinafter, this direction is referred to as an arrangement direction.

  The battery case 6 accommodates a plurality of battery cells 7 to be described later. Each battery case 6 has an opening on the top side in FIG. 1 and is connected to a collective duct 8 described later on the ground side.

  The plurality of battery cells 7 are controlled by electronic components (not shown) used for charging and discharging or temperature control. The electronic components are, for example, a DC / DC converter, a motor that drives the blower 4, electronic components controlled by an inverter, various electronic control devices, and the like. The electronic component may be housed in the case 2 or may be directly attached to the case 2 and installed outside. Each battery cell 7 has an electrode terminal 71 composed of a negative electrode terminal and a positive electrode terminal, and different polarity terminals in two adjacent battery cells are electrically connected by a bus bar (not shown). In the battery case 6, a plurality of battery cells 7 are stacked in the direction from one connection wall portion 22 to the other connection wall portion 23. Hereinafter, this direction is referred to as a stacking direction.

  The blower 4 plays a role of circulating a fluid for cooling the plurality of battery cells 7 accommodated in the case 2 to a fluid passage 5 described later. As a fluid for cooling the battery cell 7, for example, air, various gases, water, or a refrigerant can be used. The blower 4 corresponds to an example of “fluid circulation means” in the claims. The blower 4 includes a motor 41, a sirocco fan 42 driven by the motor 41, and a casing 43 containing the sirocco fan 42, and a blower duct 44 is connected to an outlet of the blower 4.

  As shown in the drawings, the sirocco fan 42 is installed in the lower part of the internal space of the case 2 so as to be close to the blower side wall portion 20 of the case 2. The motor 41 is installed between the blower side wall 20 and the sirocco fan 42. The rotation axis of the sirocco fan 42 is installed in a posture parallel to the longitudinal direction of the top wall 24 and the bottom wall 25 of the case 2. The casing 43 forms an inflow passage 55 and a blowout passage 56 that are a part of the fluid passage 5 described later. The air duct 44 is connected to the upper side of the casing 43 and extends to the vicinity of the top wall 24, and has an opening 45 that opens near the top wall 24 of the case 2.

  A bifurcated duct (not shown) is connected to the air duct 44. One of the bifurcated ducts communicates with a connection wall side passage 50 described later, and the other communicates with a connection wall side passage 51 described later. Fluid can be sent to each of the connecting wall side passages 50 and 51 by the bifurcated duct.

  The blower 4 is controlled by a control device including a battery monitoring unit (not shown). The battery cell 7 self-heats at the time of output from which current is taken out and at the time of input to be charged. The control device constantly monitors the temperature of the battery cell 7 and controls the operation of the blower 4 based on the temperature of the battery cell 7.

  The fluid passage 5 is a path through which a fluid for cooling the plurality of battery cells 7 circulates. The fluid passage 5 includes connection wall side passages 50 and 51, a top wall side passage 52, a bottom wall side passage 53, a plurality of in-stack passages 54, an inflow passage 55, a blowout passage 56, and an anti-blower side passage 57. The connection wall side passages 50 and 51 are spaces surrounded by the connection wall portions 22 and 23, the plurality of battery stacks 3, the blower side wall portion 20, the anti-blower side wall portion 21, and the collective duct 8, respectively. The top wall side passage 52 is a space surrounded by the top wall 24, the plurality of battery stacks 3, the connection wall side passages 50 and 51, the blower side wall portion 20, and the anti-blower side wall portion 21. The top wall side passage 52 is formed on the electrode terminal 71 side when viewed from the battery cell 7 in a direction (hereinafter, referred to as a vertical direction) orthogonal to both the stacking direction and the arrangement direction. The bottom wall side passage 53 is a space surrounded by the bottom wall 25, the collective duct 8, which will be described later, the connection wall side passages 50 and 51, the blower side wall portion 20, and the anti-blower side wall portion 21. The bottom wall side passage 53 is formed on the side opposite to the electrode terminal 71 (hereinafter referred to as the counter electrode terminal side) when viewed from the battery cell 7 in the vertical direction.

  The in-stack passage 54 is a space formed between adjacent battery cells 7. The inflow passage 55 is a suction portion of the sirocco fan 42 that includes the suction port of the casing 43 and extends in the rotation axis direction of the sirocco fan 42, and the air sucked by the sirocco fan 42 passes therethrough.

  The blowout passage 56 is a passage extending in the centrifugal direction of the fan orthogonal to the rotation axis of the sirocco fan 42 and is also a discharge portion of the blower 4. The blowing passage 56 is a passage extending in a direction orthogonal to the inflow passage 55.

  The anti-blower side passage 57 is a space formed between the battery stack 3 at the anti-blower side end in the arrangement direction and the anti-blower side wall 21. The connection wall side passages 50 and 51 communicate with the top wall side passage 52. The top wall side passage 52 communicates with the plurality of in-stack passages 54. The plurality of in-stack passages 54 communicate with the bottom wall side passage 53. The anti-blower side passage 57 communicates with the two connection wall side passages 50 and 51 and the top wall side passage 52. The two connection wall side passages 50 and 51 have a short side in the vertical direction and a long side in the arrangement direction.

  The collective duct 8 is a duct that connects the counter electrode terminal side end portion 72 of each battery cell 7, the inflow passage 55, the bottom wall 25, and the connection wall portions 22 and 23. The collecting duct 8 extends along the bottom wall 25 from the lower side of the battery stack 3 to the casing 43 and is connected to the inflow passage 55. The collective duct 8 also serves as a partition plate between the bottom wall side passage 53 and the connection wall side passages 50 and 51. That is, the bottom wall side passage 53 and the connection wall side passages 50 and 51 are isolated by the collective duct 8.

  Next, the flow of fluid in the battery pack 1 will be described. The fluid that has flowed out of the blowout passage 56 flows along the connection wall portions 22 and 23 in the direction from the blower side wall portion 20 side to the anti-blower side wall portion 21 side through the connection wall side passages 50 and 51. Hereinafter, in the process in which fluid flows through the connection wall side passages 50 and 51, the upstream side is referred to as the upstream side in the flow direction, and the downstream side is referred to as the downstream side in the flow direction. The subsequent flow of the fluid flowing through the connection wall side passages 50 and 51 may flow directly into the top wall side passage 52, or may flow into the top wall side passage 52 after passing through the anti-blower side passage 57. Then, the fluid flows from the top wall side passage 52 into the in-stack passage 54. That is, when viewed from the battery cell 7, the ceiling wall side passage 52 is an upstream fluid passage. Further, in the ceiling wall side passage 52, the connection wall portion 22 side is upstream and the connection wall portion 23 side is downstream for the fluid flowing into the ceiling wall side passage 52 from the connection wall side passage 50. On the other hand, for the fluid flowing into the top wall side passage 52 from the connection wall side passage 51, the connection wall portion 23 side is upstream, and the connection wall portion 22 side is downstream.

  In the in-stack passage 54, the fluid flows in the direction from the electrode terminal 71 of the battery cell 7 toward the counter electrode terminal side end 72. The fluid absorbs heat from each battery cell 7 mainly in the process of flowing the fluid through the in-stack passage 54. Thereby, the heated battery cell 7 is cooled. The fluid that has reached the vicinity of the counter electrode terminal side end portion 72 in the in-stack passage 54 flows into the bottom wall side passage 53. That is, when viewed from the battery cell 7, the bottom wall side passage 53 is a downstream side passage.

  In the bottom wall side passage 53, it flows along the bottom wall 25 in a direction from the anti-blower side wall portion 21 side to the blower side wall portion 20 side. The fluid flowing down the bottom wall side passage 53 is sucked by the sirocco fan 42 from the inflow passage 55. In the process of flowing through the fluid passage 5, the fluid contacts the two connection wall portions 22 and 23, the top wall 24, and the bottom wall 25. Therefore, the fluid exchanges heat with the two connection wall portions 22 and 23, the top wall 24, and the bottom wall 25. The reason why the fluid flowing in the connection wall side passages 50 and 51 flows into the top wall side passage 52 and then into the bottom wall side passage 53 is that the bottom wall side passage 53 communicates with the inflow passage 55. This is because it is a negative pressure region.

  As shown in FIG. 3, one connection wall side passage 50 has a first region 501 and a second region 502. In the first region 501, a plurality of fins 221 project from the inner wall surface of the opposing connection wall portion 22 toward the inside of the battery pack 1. As shown in FIG. 1, the fins 221 formed in the first region 501 are formed so as to protrude close to the end of the battery stack 3 on the connection wall side passage 50 side. Specifically, the distance between the end of the battery stack 3 on the connection wall side passage 50 side and the fin 221 is smaller than the projecting length of the fin 221 so that a large amount of fluid can be prevented from flowing into the gap. ing. Note that the fins 221 may be integrally formed on the inner wall surface of the connection wall portion 22 or may be separately attached by adhesion or the like. In the second region 502, the fins 221 do not protrude from the connection wall portion 22 toward the inside of the battery pack 1, and the wall surfaces are flat. The connection wall portion 22 corresponds to “first inner wall surface” and “inner wall surface” in claims, and the connection wall side passage 50 corresponds to “first fluid passage” and “fluid passage”. Further, the fin 221 corresponds to “first fin” and “fin” in the claims, the first region 501 corresponds to “first region”, and the second region 502 corresponds to “second region”.

  The first region 501 and the second region 502 have a substantially triangular shape when viewed from the direction perpendicular to the wall surfaces of the connection wall portions 22 and 23. The width of the first region 501 in the vertical direction is gradually increased from the upstream side to the downstream side in the fluid flow direction in the connection wall side passage 50. That is, the boundary portion 503 between the first region 501 and the second region 502 is a slope as viewed from the direction perpendicular to the surfaces of the connection wall portions 22 and 23. The boundary portion 503 corresponds to an inflow surface formed by upstream end portions of the plurality of fins 221.

  On the downstream side of the connecting wall side passage 50, the vertical width of the first region 501 is equal to the vertical width of the connecting wall side passage 50. Further, the width in the vertical direction of the second region 502 gradually decreases from the upstream side to the downstream side in the fluid flow direction in the connection wall side passage 50. On the downstream side of the connection wall side passage 50, the vertical width of the second region 502 is zero. When viewed from the vertical direction, the first region 501 is formed from a position facing the battery stack 3 at one end in the arrangement direction to a position facing the battery stack 3 at the other end. The first region 501 is formed on the battery stack 3 side from the blowing passage 56 when viewed from the stacking direction.

  The plurality of fins 221 are straight fins and are formed in parallel with each other at a predetermined interval. The fins 221 are for promoting heat exchange with the fluid by allowing the fluid to pass between each other. The straight fin here refers to a substantially straight fin. The fins 221 are formed of a material having relatively good thermal conductivity such as aluminum or iron. In addition, as a kind of fin 221, a louver fin etc. may be sufficient besides a straight fin. Some fins 221 are formed in a substantially straight line from the boundary portion 503 (inflow surface) to the top wall side end portion 222 of the connection wall portion 22 and some are not formed to the top wall side end portion 222. The fins that are not formed up to the top wall side end portion 222 exist in the most downstream area of the connection wall side passage 50. In addition, the inflow port 223 that is an inlet through which the fluid flows between the plurality of fins faces the upstream side in the fluid flow direction in the connection wall side passage 50 and is not parallel to the fluid flow direction in the connection wall side passage 50. The fins 221 are inclined so as to face the direction. That is, the direction opposite to the direction in which the fluid flows into the first region 501 (the inlet of the fin 221) (hereinafter referred to as the inflow direction) faces the upstream side of the fluid flow direction in the connection wall side passage 50. Accordingly, the length of each fin 221 is shorter than the length of the long side of the connection wall side passage 50.

  The fluid flows from the second region to the first region. That is, it flows into the first region 501 from the inlet 223 provided in the boundary portion 503 (inflow surface) in the process of flowing through the connection wall side passage 50. The fluid that has flowed into the first region 501 flows down between the fins 221 in parallel with the inflow direction and leaves the first region 501 from the outlet 224. The fluid that has escaped the first region 501 from between the fins formed up to the top wall side end 222 flows directly into the top wall side passage 52. On the other hand, the fluid that has escaped the first region 501 from between the fins not formed up to the top wall side end 222 flows into the anti-blower side passage 57 and then into the top wall side passage 52. In the process of flowing between the fins 221, the fluid dissipates heat to the fins 221. In the connection wall side passage 50, the direction from the blower side wall portion 20 to the anti-blower side wall portion 21 corresponds to the “fluid flow direction” in the claims. Further, the vertical direction corresponds to “a direction perpendicular to both the fluid flow direction and the first inner wall surface” in the claims. The “inflow direction” in the claims refers to a direction in which fluid flows into the first region 501 and refers to a direction in which the fluid flows in the inflow port 223.

  Next, the effect which the battery pack 1 of this embodiment brings is demonstrated.

  (1) The area of the inlet 223 is larger than the cross-sectional area of the first fluid passage in the fluid flow direction. That is, the area of the inflow port 223 into which the fluid flows into the first region 501 is larger than that in the comparative example. Therefore, a larger number of fins 221 than in the comparative example can be formed, and a fluid having a high temperature supplied from the blower 4 can flow into any fin 221. Therefore, since any fluid having a sufficient temperature difference with the outside air can flow into any fin 221, if a heat radiation area equivalent to the comparative example can be secured by increasing the number of fins, Compared to the example, the heat dissipation efficiency can be improved.

  (2) As in the comparative example, the first region 501, i.e., the fins 221 are formed in the entire region of the connection wall side passage 50 in parallel with the fluid flow direction, so The area can be increased. Here, the heat radiation amount from the fluid to the inner wall surface is proportional to the flow rate of the fluid flowing into the first region 501 in addition to the heat radiation area. Further, since the flow rate is proportional to the cross-sectional area through which the fluid passes, it is necessary to increase the cross-sectional area in order to improve the heat dissipation performance. In that regard, in the comparative example, the cross-sectional area through which the fluid passes is equal to the cross-sectional area of the connection wall side passage 50 in the fluid flow direction (hereinafter referred to as a comparative cross-sectional area). On the other hand, in the present embodiment, the area of the boundary portion 503 between the first region 501 and the second region 502 is larger than the cross-sectional area of the connection wall side passage 50 as viewed from the fluid flow direction and flows into the first region 501. The direction is not parallel to the fluid flow direction. Therefore, the cross-sectional area through which the fluid passes through the first region 501 is larger than the comparative cross-sectional area. Therefore, compared with the comparative example, the present invention can induce a larger amount of fluid to the first region 501 and improve the heat dissipation performance.

  (3) The inflow direction of the fluid to the first region 501 is not parallel to the fluid flow direction in the connection wall side passage 50, and the fluid flow direction between the fins 221 is parallel to the inflow direction. That is, the direction in which the fluid flows between the fins 221 is not parallel to the direction of fluid flow in the connection wall side passage 50. Further, the connecting wall side passage 50 has a long side in the fluid flow direction. Therefore, the length of the fin 221 of this embodiment is compared with the length of the fin in the case where the fin is formed on the entire surface of the connection wall 22 facing the connection wall side passage 50 in parallel with the fluid flow direction as in the comparative example. It gets shorter. Therefore, in the process in which the fluid flows between the fins 221, even if heat exchange is performed between the fluid and the fins 221 and the temperature of the fluid is lowered, in the present embodiment, the downstream of the fins is compared with the comparative example. The temperature difference between the fluid in the vicinity and the inner wall surface is sufficiently large. Therefore, heat exchange between the fluid and the inner wall surface is sufficiently performed also on the downstream side of the fins. Therefore, heat dissipation efficiency can be increased while reducing the space volume occupied by the first region 501.

  (4) As described above, the length of the fin 221 is shorter than that of the comparative example. Therefore, the resistance of the flow path between the fins 221 is smaller than that of the comparative example. Therefore, a fluid having a larger flow rate than that of the comparative example can be guided to the first region 501, and the heat dissipation performance can be improved.

  (5) The inflow port 223 of the fin 221 is inclined so as to face the upstream side in the fluid flow direction in the connection wall side passage 50 and in the direction parallel to the fluid flow direction in the connection wall side passage 50. Yes. Therefore, compared with the case where the inflow port 223 faces the direction perpendicular to the fluid flow direction in the connection wall side passage 50 and the case where the inflow port 223 faces the downstream side of the fluid flow direction in the connection wall side passage 50, the fluid flows into the inflow port 223. Inflow resistance at the time of inflow is small. Therefore, the fluid can be smoothly guided to the first region 501, and as a result, the heat dissipation performance can be improved.

  (6) On the downstream side of the connection wall side passage 50, the vertical width of the first region 501 is equal to the vertical width of the connection wall side passage 50. Therefore, the fluid flowing through the connection wall side passage 50 flows into the first region 501 before reaching the most downstream side from the upstream of the connection wall side passage 50. Therefore, compared with the case where the vertical width of the first region 501 does not become equal to the vertical width of the connection wall side passage 50 before the fluid reaches the most downstream of the connection wall side passage 50, The fluid that does not flow into the one region 501 can be reduced. As a result, the heat dissipation performance can be improved.

  (7) The distance between the end of the battery stack 3 on the connection wall side passage 50 side and the fin 221 is smaller than the protruding length of the fin 221 so that a large amount of fluid can be prevented from flowing into the gap. . Therefore, the fluid can be introduced into the first region 501 more reliably. Therefore, in the connection wall side channel | path 50, it can suppress that a fluid does not contact with the fin 221, and the improvement of heat dissipation performance can be aimed at.

(Second Embodiment)
Hereinafter, a second embodiment of the present invention will be described with reference to the drawings. In addition, description is simplified or abbreviate | omitted about the part which overlaps 1st Embodiment.

  As shown in FIG. 4, the ceiling wall side passage 52 has a third region 521 and a fourth region 522. In the third region 521, a plurality of fins 241 protrude from the inner wall surface of the top wall 24 toward the inside of the battery pack 1. As shown in FIG. 5, the fins 241 formed in the third region 521 protrude so as to approach the end of the battery stack 3 on the top wall side passage 52 side. Specifically, the distance between the end of the battery stack 3 on the top wall side passage 52 side and the fins 241 is smaller than the protruding length of the fins 241, so that a large amount of fluid can be prevented from flowing into the gap. ing. The fins 241 may be integrally formed on the inner wall surface of the top wall 24 or may be separately attached. In the fourth region 522, the fins 221 do not protrude from the top wall 24 toward the inside of the battery pack 1, and the wall surfaces are flat. The top wall 24 corresponds to a “second inner wall surface” in the claims, and the top wall side passage 52 corresponds to a “second fluid passage”. Further, the fin 241 corresponds to a “second fin” in the claims, and the third region 521 corresponds to a “third region”.

  The third region 521 and the fourth region 522 have a substantially triangular shape when viewed from the direction perpendicular to the wall surface of the top wall 24. The third region 521 is formed continuously with the first region 501. The fourth region 522 is a portion other than the third region 521 in the top wall side passage 52. Here, “continuous” means that no gap is formed between the fin 221 and the fin 241. When viewed from the direction perpendicular to the wall surface of the top wall 24, the third region 521 is formed on the connection wall side passage 50 side. On the other hand, when viewed from the direction perpendicular to the wall surface of the top wall 24, the fourth region 522 is formed on the connection wall side passage 51 side. As the fluid flowing into the top wall side passage 52 from the connection wall side passage 50 moves from the connection wall portion 22 side on the upstream side in the top wall side passage 52 to the connection wall portion 23 side on the downstream side, the third The width in the arrangement direction of the regions 521 gradually decreases. Hereinafter, among the three sides of the third region 521 when viewed from the vertical direction, the connection wall portion 22 side is the first side, the blower side wall portion 20 side is the second side, and the anti-blower side wall portion 21 side is the third side. Called.

  The plurality of fins 241 are straight fins and are formed in parallel with each other at a predetermined interval. The fins 241 are for promoting heat exchange with the fluid by allowing the fluid to pass between them. The straight fin here refers to a substantially straight fin. Note that the fin 241 may be a louver fin or the like. The fins 241 are formed of a material having relatively good thermal conductivity such as aluminum or iron. The fins 241 are formed in a substantially linear shape from the first side to the third side. In addition, the inclination angle β with respect to the stacking direction of the fins 241 when viewed from the vertical direction is the same as the inclination angle α with respect to the vertical direction of the fins 221. As shown in FIG. 5, the inclination angle γ of the fin 241 with respect to the vertical direction when viewed from the stacking direction is the same as the inclination angle α of the fin 221 with respect to the vertical direction. That is, the inclination angle γ of the fin 241 with respect to the vertical direction when viewed from the stacking direction is equal to the inclination angle β with respect to the stacking direction of the fin 241 when viewed from the vertical direction.

  In the top wall side end portion 222, the fins 241 are formed at positions facing the formation positions when viewed from the stacking direction of the fins 221. In other words, the space between the fins 221 serving as a fluid flow path in the first region 501 and the space between the fins 241 serving as a fluid flow path in the third region 521 are formed at positions facing each other.

  As shown in FIG. 6, among the fins 221, the fins where the fluid does not flow directly to the ceiling wall side passage 52 through the fins 221 are the longest fins 225 of the plurality of fins 221 in the first region 501. Only the same length is formed.

  Next, the flow of fluid in the first region 501 and the third region 521 will be described with reference to FIG. The fluid that has flowed down the first region 501 flows into the space between the fins 241 facing the space between the fins 221. As a result, the fluid flows into the third region 521. The fluid flowing down the third region 521 leaves the third region 521 from the third side and appropriately flows into the in-stack passage 54. Of course, there is also a fluid that flows into the in-stack passage 54 while flowing through the third region 521 before reaching the third side. In the process of flowing between the fins 241, the fluid dissipates heat to the fins 241.

  The sum of the path length of the fluid in the first area 501 and the path length of the fluid in the third area 521 formed at a position opposite to each path indicates which inflow port of the first area 501 the fluid has flowed into. Regardless. That is, the distance that the fluid passes from the third side of the third region 521 to the outflow of the fluid after the fluid flows in from the inlet of the first region 501 is equal regardless of the inlet. Note that “equal” in this case may not be completely coincident with each other as long as the variation in ventilation resistance is within a predetermined range depending on the position of the inlet 223, as will be described later. The predetermined range is a numerical range that is appropriately set in view of the performance of the battery pack 1.

  Next, the effect which the battery pack 1 of this embodiment brings is demonstrated.

  (1) Generally, the shorter the path length of the fluid, the smaller the flow resistance. Therefore, when the path length of the fluid differs depending on the position of the inlet as in the first area 501 of the first embodiment, there is a possibility that the fluid may intensively flow into a path with a short path length, that is, the area A in FIG. is there. In this case, the heat exchange in the route having a long route length in the first region 501, that is, the region B in FIG. 3 cannot be promoted, which is inefficient. Therefore, in this embodiment, the sum of the path length of the fluid in the first region 501 and the path length of the fluid in the third region 521 formed at a position facing each path is the inflow port in the first region 501. It is equal regardless of whether fluid has flowed in from. Therefore, variation in flow resistance due to the position of the inlet can be suppressed, and fluid can be prevented from intensively flowing into a specific inlet. Therefore, the entire fins 221 formed in the first region 501 can be efficiently used, and the heat dissipation performance can be improved.

  (2) When viewed from the stacking direction, the fins 241 are inclined at the same angle as the inclination of the fins 221 with respect to the vertical direction. Therefore, the fluid can be smoothly guided from the first region 501 to the third region 521 as compared to the case where the inclination is different. Therefore, heat dissipation performance can be improved.

  (3) In the present embodiment, the third region 521 is formed in addition to the first region 501. Therefore, compared with 1st Embodiment, many fins for heat exchange with a fluid are formed. Therefore, the heat dissipation performance can be improved as compared with the first embodiment.

  (4) The distance between the end of the battery stack 3 on the side of the top wall side passage 52 and the fins 241 is smaller than the protruding length of the fins 241 so that a large amount of fluid can be prevented from flowing into the gap. . Therefore, the fluid can be introduced into the third region 521 more reliably. Therefore, in the ceiling wall side channel | path 52, it can suppress that a fluid does not contact with the fin 241, and can improve a thermal radiation performance.

  In addition, the same operational effects as the first embodiment can be obtained.

(Third embodiment)
Hereinafter, a third embodiment of the present invention will be described with reference to FIGS. In addition, description is simplified or abbreviate | omitted about the part which overlaps with embodiment mentioned above.

  In the battery pack according to the present embodiment, internal fins 150 (151 and 152) are provided on the inner surface of the case 2, and external fins 160 (161 and 162) are provided on the outer surface of the case 2 (FIGS. 11 and 11). 12). Furthermore, an external duct 170 and an external blower 172 are attached to the outer surface of the case 2 (FIG. 13). The external fin 160 is located inside the external duct 170. The external blower 172 blows air outside the case 2 to the external duct 170.

  In the present embodiment, in FIGS. 11 to 13, Fr indicates the vehicle front side, Rr indicates the vehicle rear side, RH indicates the vehicle right side, and LH indicates the vehicle left side. When the direction in the battery pack 100 is indicated, the direction of Fr-Rr is referred to as the front-rear direction, and the direction of RH-LH is referred to as the left-right direction. In addition, the action direction of gravity is referred to as the vertical direction.

  As shown in FIG. 11, the internal fin 150 is a heat exchange promoting fin provided inside the case 2, and includes a first internal fin 151 and a second internal fin 152. Each of the internal fins 151 and 152 is formed of an aluminum material or an iron material having excellent thermal conductivity.

  The first internal fins 151 are provided on the connection wall portion 22 side and the connection wall portion 23 side so as to be symmetric with respect to the center line facing the front-rear direction of the case 2. The second internal fins 152 are provided at two locations on the connection wall portion 22 side and the connection wall portion 23 side of the top wall 24 so as to be symmetric with respect to the center line facing the front-rear direction of the case 2. ing. The first internal fin 151 corresponds to “first fin” and “fin” in the claims, and the second internal fin 152 corresponds to “second fin”, respectively.

  Here, as each of the internal fins 151 and 152, for example, a straight fin that can set a flow resistance to a fluid relatively small is employed. The straight fins are fins in which a large number of thin plate-like fin portions protruding vertically from the thin plate-like substrate portion are arranged in parallel, and fluid passages are formed between the fin portions. The internal fins 151 and 152 are not limited to the straight fins, but may be other corrugated fins (with or without louvers), offset fins, or the like.

  The substrate portion of the first internal fin 151 is formed in an elongated right triangle A, B, C, and the corners A-B-C are substantially perpendicular. The length of the long side AB extending in the front-rear direction is set to be equal to the length of the battery stack 3 in the stacking direction. Further, the length of the short side BC extending in the vertical direction is set to be slightly smaller than the vertical dimension of the connection wall portions 22 and 23. The board portion is arranged so that the position in the front-rear direction corresponds to the position of the battery stack 3. And short side BC is located in the anti-blower side wall part 21 side, apex angle BAC facing the short side BC is located in the fan side wall part 20 side, and long side AB is connected. It arrange | positions along the upper side of wall part 22,23. The substrate portions are bonded to the inner surfaces of the connection wall portions 22 and 23, respectively. Therefore, the oblique side C-A of the substrate portion is a side inclined downward from the blower side wall 20 side toward the anti-blower side wall 21 side.

  The fin portion of the first internal fin 151 protrudes vertically from the substrate portion toward the plurality of battery cells 7, and the protruding tip portion has a plurality of batteries so that more fluid flows through the fin portion. It extends to a position close to the side surface of the cell 7. Further, the plate surface of the fin portion is set so as to be inclined toward the anti-blower side wall portion 21 side from the lower side to the upper side with respect to the vertical direction. Moreover, the length of the fluid passage by a fin part becomes so long that it goes to the anti-blower side wall part 21 side from the fan side wall part 20 side.

  On the other hand, the substrate portion of the second internal fin 152 has an elongated triangular shape D, E, F. The length of the long side D-E extending in the front-rear direction is set to be equal to the long side A-B of the substrate portion of the first internal fin 151. The substrate portion of the second internal fin 152 is disposed so that the position in the front-rear direction corresponds to the position of the first internal fin 151. And short side EF is located in the fan side wall part 20 side, and apex angle ED-F which opposes short side EF is located in the anti-blower side wall part 21 side, and long side DE is long. It arrange | positions along the edge | side of the front-back direction in the top wall 24. FIG. The substrate portion of the second internal fin 152 is joined to the inner surface of the top wall 24 so as to be adjacent to the fin portion of the first internal fin 151.

  The fin portion of the second internal fin 152 protrudes vertically from the substrate portion toward the plurality of battery cells 7, and the protruding tip portion has a plurality of protrusions so that more fluid flows through the fin portion. It extends to a position close to the upper surface of the battery cell 7. Moreover, the plate | board surface of a fin part is set so that it may incline to the anti-blower side wall part 21 side, so that it goes to the center side of case 2 with respect to the left-right direction. The length of the fluid passage by a fin part is so short that it goes to the anti-blower side wall part 21 side from the fan side wall part 20 side. And the fluid passage by the fin part of the 2nd internal fin 152 is connected so that the fluid path by the fin part of the 1st internal fin 151 may be followed.

  As shown in FIG. 12, the external fin 160 is a heat exchange promoting fin provided on the outside of the case 2, and includes a first external fin 161 and a second external fin 162. Each of the external fins 161 and 162 is formed of an aluminum material or an iron material having excellent thermal conductivity.

  The first external fins 161 are provided on the connection wall portion 22 side and the connection wall portion 23 side so as to be symmetric with respect to the center line facing the front-rear direction of the case 2. In addition, the second external fins 162 are provided at two locations on the connection wall portion 22 side and the connection wall portion 23 side of the top wall 24 so as to be symmetric with respect to the center line facing the front-rear direction of the case 2. ing.

  Here, as each external fin 161, 162, for example, a corrugated fin capable of setting a flow heat transfer performance with respect to a fluid relatively large is employed (FIG. 14). The corrugated fin has a wavy shape as a whole, and a large number of louvers 160a are formed on the wavy surfaces facing each other. A corrugated passage 160b, which is a fluid passage, is formed between the wavy opposing surfaces. Further, part of the fluid flowing through the corrugated passage 160b flows through the louver 160a in a direction penetrating the corrugated plate surface. The direction in which the fluid flows through the corrugated passage 160b and the direction in which the corrugated passage 160b extends is perpendicular to the direction La in which the waves continue.

  The first external fins 161 are provided as a set of a plurality (two in this case). The first outer fin 161 is somewhat anti-blower side wall so that the wave continuation direction (La) faces the front-rear direction in the region corresponding to the first inner fin 151 in the connection wall portions 22 and 23. It arrange | positions so that it may be offset by the part 21 side.

  The second external fins 162 are provided as a set of a plurality (two here). The second external fins 162 are arranged on the connection wall portions 22 and 23 side of the top wall 24 so that the wave continuation direction faces the front-rear direction in the region corresponding to the second internal fins 152 and the first external fins It arrange | positions so that it may become the air blower side wall part 20 side rather than the fin 161 somewhat.

  As shown in FIG. 13 and FIG. 15, the external duct 170 is a duct that allows a cooling fluid to flow along the outer surface of the case 2. As the cooling fluid, for example, air-conditioned air (cooled cooling air) in the passenger compartment is used.

  The external duct 170 has a flat cross-sectional shape, and is formed on the outer surface of the case 2, specifically, the connection wall portions 22 and 23 region, the region on the connection wall portion 22 and 23 side of the top wall 24, and the blower side wall. Part 20 is provided in the region. The external duct 170 is formed so as to enclose (cover) each of the external fins 161 and 162. The interior of the external duct 170 is mainly a flow path that connects the connection wall portions 22 and 23 region, the connection wall portions 22 and 23 side region of the top wall 24, and the blower side wall portion 20 region in this order.

  Both end portions (on the connection wall portions 22 and 23 side) of the external duct 170 on the side opposite to the blower side wall portion 21 are suction portions that suck in the conditioned air. A wind direction device 171 for diverting the sucked conditioned air to the lower side of the first external fin 161 and the case 2 center side of the second external fin 162 is provided on the downstream side immediately after the suction portion. .

  Further, an external blower 172 is provided at the center of the external duct 170 on the blower side wall portion 20 side, and the upper and lower portions of the external blower 172 serve as blow-out portions that blow out conditioned air. For example, a turbo fan is used for the external blower 172.

  FIG. 16 is a schematic view of the connection wall portion 22 as viewed from the inside. A one-dot chain line in the drawing indicates a position where the first external fin 161, the external duct 170, and the wind direction device 171 are attached to the connection wall portion 22. As illustrated in FIGS. 15 and 16, a range in which the first internal fins 151 are provided in the connection wall portions 22 and 23 is referred to as an internal fin range A1. Moreover, let the part covered with the external duct 170 among the connection wall parts 22 and 23 be the external duct range A2.

  In the present embodiment, the first external fin 161 and the external duct 170 are arranged so that the entire internal fin range A1 is included in the external duct range A2. Furthermore, the entire range of the top wall 24 where the second internal fins 152 are provided overlaps with the portion of the top wall 24 covered with the external duct 170. That is, the entire range of the case 2 where the internal fins 150 are provided is covered with the external duct 170.

  Further, the first external fins 161 are disposed at positions overlapping the first internal fins 151 when viewed from the direction perpendicular to the wall surfaces of the connection wall portions 22 and 23. Specifically, the entire first outer fin 161 overlaps the first inner fin 151. The second external fins 162 are arranged at positions overlapping the second internal fins 152 when viewed from the direction perpendicular to the wall surface of the top wall 24. Specifically, the entire second outer fin 162 overlaps with the second inner fin 152.

  The operation of the battery pack 100 configured as described above will be described with reference to FIGS.

  The battery cell 7 self-heats at the time of output from which current is taken out and at the time of input to be charged. The battery cell 7 is affected by the temperature outside the case 2 depending on the season. The battery management unit constantly monitors the temperature of the battery cell 7 in the battery pack 100 with a temperature detector, and controls the operation of each fan 4 and the external fan 172 based on the temperature of the battery cell 7. . In the first embodiment, the fluid is circulated by one blower 4 for all the battery cells 7 accommodated in the case 2. However, in the present embodiment, the fluid is circulated by two blowers 4. ing. Specifically, in the fluid passage 5 formed in the case 2, the region on the connection wall portion 22 side and the region of the connection wall portion 23 are shared by each blower 4 and circulated.

  A blower duct 46 is connected to the blower outlet of the blower 4. As shown in FIG. 11, the air duct 46 guides the fluid blown from the blower 4 to the connection wall side passages 50 and 51. The connection wall side passages 50 and 51 are passages formed between the connection wall portions 22 and 23 (inner wall surfaces) of the case 2 and the battery cells 7 and extend in a predetermined direction along the connection wall portion 22. Corresponds to the passage. The predetermined direction is the front-rear direction shown in FIG. 11 and corresponds to the flow direction and the arrangement direction according to the first embodiment.

  The air outlet 46a of the air duct 46 has a shape extending along the connection wall portions 22 and 23 in a direction intersecting the predetermined direction of the air duct 46, and is arranged in a direction in which fluid is blown out in the predetermined direction. The blower outlet 46a is arrange | positioned in the direction which blows off the fluid to a predetermined direction. In short, the discharge direction D1 (see FIGS. 11 and 16) of the fluid from the outlet 46a coincides with the longitudinal direction (predetermined direction) of the connection wall side passages 50 and 51. Moreover, the blower outlet 46a is a shape extended along the connection wall parts 22 and 23 in the direction (passage width direction) which cross | intersects a predetermined direction. In the example of FIG. 11, the passage width direction is the vertical direction.

  And it is comprised so that the fluid which flows out out of the blower outlet 46a may incline with respect to the inflow surface formed by the upstream edge part of the some 1st internal fin 151, ie, the boundary part 503. As shown in FIG. The flow direction of the fluid flowing between the plurality of first internal fins 151 intersects the blowing direction D1. In other words, the direction of the first internal fin 151 is set so that the longitudinal direction of the first internal fin 151 intersects the blowing direction D1.

  The battery management unit applies a voltage to each blower 4 according to the temperature of the battery cell 7 to operate the sirocco fan 42. If the temperature of the battery cell 7 is equal to or higher than a predetermined temperature, the external blower 172 may be operated together with each blower 4.

  Specifically, the battery management unit switches between a low heat dissipation mode in which each fan 4 is operated while stopping the external fan 172, and a high heat dissipation mode in which both the external fan 172 and each fan 4 are operated.

  As described above, when only each blower 4 is operated in the low heat dissipation mode, the internal fluid in the case 2 circulates in the fluid passage as shown in FIG.

  That is, the fluid blown out from each blower 4 flows into the connection wall side passage 50 and the connection wall side passage 51, respectively. The fluid flowing into each of the connection wall side passages 50 and 51 is directed from the lower side (the bottom wall 25 side) to the upper side (the top wall 24 side) along the inclined fin portion of the first internal fin 151. And flows smoothly. Each of the connection wall side passages 50 and 51 is a passage having a flat cross section that extends long along the long side of each of the connection wall side passages 50 and 51. The inlet cross-sectional area when the fluid flows is smaller than the other top wall side passage 52, stack inner passage 54, and bottom wall side passage 53, and a fluid flow velocity can be obtained to some extent. Pressure is the dominant place. Therefore, in each of the connection wall side passages 50 and 51, the heat of the fluid accompanied by the flow velocity is effectively transmitted to the first internal fins 151 and further released to the outside through the connection wall portions 22 and 23.

  Next, the fluid smoothly flows into the fin portion of the second internal fin 152 continuously connected to the first internal fin 151 and flows into the top wall side passage 52 along the fin portion. The inlet cross-sectional area when flowing into the top wall side is much larger than the inlet cross-sectional area when flowing into the connection wall side passages 50 and 51, and the flow velocity of the fluid is small. It becomes an independent place. Therefore, the fluid that has flowed into the top wall side passage 52 from the connection wall side passages 50 and 51 side spreads evenly in the top wall side passage 52.

  As shown in FIG. 17, the fluid that has flowed into the ceiling wall side passage 52 from the connection wall side passage 50 mainly spreads in the region of the two battery stacks 3 on the connection wall portion 22 side. In addition, the fluid that has flowed into the top wall side passage 52 from the connection wall side passage 51 mainly spreads into the area of the two battery stacks 3 on the connection wall portion 23 side. The heat of the fluid flowing into the ceiling wall side passage 52 is transmitted from the second internal fins 152 to the ceiling wall 24 or directly transmitted to the ceiling wall 24 and released to the outside.

  Next, the fluid flowing into the top wall side passage 52 passes through the in-stack passage 54 formed between the battery cells 7 and reaches the bottom wall side passage 53. Here, the connection wall side passages 50 and 51 and the top wall side passage 52 become positive pressure spaces due to the blowout of the blowers 4. Further, the bottom wall side passage 53 becomes a negative pressure space by suction of each blower 4, and the movement of fluid from the top wall side passage 52 side to the bottom wall side passage 53 side is continuously performed by the pressure difference between the two. It will be. When the fluid passes through the in-stack passage 54, the heat of each battery cell 7 is transmitted to the fluid.

  Next, the fluid flowing into the bottom wall side passage 53 moves along the longitudinal direction of each beam 118 and reaches the suction port of each blower 4. Then, the heat of the fluid flowing into the bottom wall side passage 53 is transmitted to the bottom wall 25 and released to the outside.

  The fluid passage 5 is formed so that the total amount of the fluid blown out from the blower 4 flows through the connection wall side passages 50 and 51, the top wall side passage 52, the in-stack passage 54, and the bottom wall side passage 53 in this order. ing. That is, the fluid passage 5 is formed so that the fluid does not flow by bypassing these passages.

  As described above, when the fluid circulates through the fluid passage 5 in the case 2, the heat of the fluid, that is, the heat of the battery cell 7 is mainly released from the top wall 24 and the bottom wall 25 having a large area to the outside. The At this time, heat exchange is promoted by the internal fins 151 and 152. Therefore, each battery cell 7 is adjusted to an appropriate temperature.

  Further, as described above, in the high heat dissipation mode, in addition to the operation of each fan 4, the external fan 172 in the external duct 170 is operated. In this case, conditioned air in the passenger compartment is sucked into the external duct 170 from the suction portion of the external duct 170.

  As shown in FIG. 18, the conditioned air sucked from the suction port is diverted by the wind direction device 171 and is diverted toward the lower side of the first external fin 161 and the center side of the case 2 of the second external fin 162. The Then, the respective flows pass through the corrugated passage 160b so as to cross the external fins 161 and 162, join at the joining passage portion 175, and are blown out from the blowing portions provided at the upper and lower portions of the external blower 172.

  At this time, the heat of the fluid in the case 2 is transmitted to the conditioned air through the internal fins 151 and 152, the connection wall portions 22 and 23, the top wall 24, and the external fins 161 and 162, and is released to the outside. The Therefore, heat exchange of the fluid in the case 2 is further promoted by the external fins 161 and 162 in addition to the internal fins 151 and 152. Each battery cell 7 is forcibly cooled to an appropriate temperature in a short time.

  The flow of conditioned air along the external fin 160 will be described in more detail. The fluid diverted downward by the wind direction device 171 flows into the connection wall external passage 173 surrounded by the external duct 170 and the connection wall portion 22, and passes through the two first external fins 161 in series. The fluid divided upward by the wind direction device 171 flows into the top wall side external passage 174 surrounded by the external duct 170 and the top wall 24 and passes through the two second external fins 162 in series.

  The fluid flowing out from the connection wall external passage 173 and the top wall side external passage 174 flows into the merge passage portion 175 surrounded by the external duct 170 and the connection wall portion 22 and joins. That is, the fluid passes through the first external fin 161 and the second external fin 162 in parallel. The merge passage portion 175 has a shape extending horizontally along the longitudinal direction of the connection wall portions 22 and 23. In other words, in the first external fin 161 located on the downstream side of the two first external fins 161, the corrugated direction La is oriented horizontally extending along the longitudinal direction of the connection wall portions 22 and 23. Is arranged.

  As described above, according to the present embodiment, the air outlet 46a has a shape extending in the passage width direction of the connection wall portions 22 and 23, and the fluid is blown out in the longitudinal direction (predetermined direction) of the connection wall portions 22 and 23. It is arranged in the direction. Therefore, in the portion located on the upstream side of the first fin 221 in the connection wall side passages 50 and 51, the fluid flows in a predetermined direction over the entire passage width direction (see FIG. 16). The fluid that has flowed in this way then flows obliquely with respect to the inflow surface of the first fin 221. And the 1st fin 221 is arrange | positioned in the direction where the fluid which distribute | circulates between fins becomes diagonal with respect to the blowing direction D1 (predetermined direction). Therefore, it is possible to form a larger number of first fins 221 than in the comparative example while making the fin pitch the same as the fin pitch according to the comparative example (FIG. 10).

  Here, since the temperature difference between the fluid and the outside air is large in the upstream portion of the first fin 221, the heat radiation amount per unit area is large, and the heat radiation efficiency is good. On the other hand, in the downstream part of the first fins 221, the heat dissipation efficiency is worse than that in the upstream part. Focusing on this point, in this embodiment, since the number of fins can be increased as described above, the portion with good heat dissipation efficiency can be increased, and the heat dissipation efficiency can be improved.

  Furthermore, in this embodiment, since the external fin 160, the external duct 170, and the external blower 172 are provided, the heat of the fluid in the case 2 is exchanged by the external fins 161 and 162 in addition to the internal fins 151 and 152. Is further promoted. Therefore, it is possible to promote cooling to an appropriate temperature in a short time.

  Furthermore, according to the present embodiment, the entire internal fin range A1 of the case 2 is included in the external duct range A2. Therefore, the heat transmitted to the case 2 through the first internal fin 151 is easily transmitted to the first external fin 161. Then, the heat transmitted to the first external fins 161 is radiated by heat exchange with the air (conditioned air) flowing through the external duct 170 by the external blower 172. Therefore, the amount of heat radiation per unit time can be increased, and cooling of the battery cell 7 can be promoted. Such an effect of increasing the heat radiation amount is particularly prominent when the external blower 172 is operated in the high heat radiation mode.

(Fourth embodiment)
In the third embodiment, the entire inner fin range A1 is included in the outer duct range A2. On the other hand, in this embodiment, as shown in FIGS. 19 and 20, the entire inner fin range A1 is located outside the outer duct range A2. Further, the entire range of the top wall 24 where the second internal fins 152 are provided is located outside the range of the top wall 24 covered with the external duct 170. That is, the entire range of the case 2 where the internal fins 150 are provided is located outside the external duct 170.

  The first external fins 161 are arranged at positions away from the first internal fins 151 when viewed from the direction perpendicular to the wall surfaces of the connection wall portions 22 and 23. Specifically, the entire first outer fin 161 is disposed at a position away from the first inner fin 151. The second external fins 162 are arranged at positions away from the second internal fins 152 when viewed from the direction perpendicular to the wall surface of the top wall 24. Specifically, the entire second external fin 162 is disposed at a position away from the second internal fin 152.

  As described above, in the high heat dissipation mode, each blower 4 is activated and the external blower 172 is activated. On the other hand, in the low heat dissipation mode, the external blower 172 is stopped while operating each blower 4.

  Now, since the external blower 172 is disposed outside the case 2 and the inlet and outlet of the external blower 172 are open to the outside of the case 2, noise can be heard more easily by the user than the internal blower 4. Become. In view of this point, when the temperature of the battery cell 7 is lower than the predetermined temperature, it is desirable in terms of noise reduction to stop the external blower 172 as described above. However, when the external blower 172 is stopped, air does not flow through the external duct 170, so that high-temperature air accumulates in the external duct 170, and the external duct 170 hinders heat dissipation from the case 2. .

  In the present embodiment in view of this point, the entire inner fin range A1 is located outside the outer duct range A2. For this reason, it is possible to suppress the external duct 170 from hindering heat dissipation from the case 2 under the situation where the external blower 172 is stopped. Therefore, the amount of heat released from the case 2 can be increased when the external blower 172 is stopped.

(Fifth embodiment)
In the third embodiment, the entire inner fin range A1 is included in the outer duct range A2. On the other hand, in this embodiment, as shown in FIGS. 21 and 22, the internal fin range A1 is partially included in the external duct range A2. Further, the range in which the second internal fins 152 are provided in the top wall 24 is partially included in the range covered by the external duct 170 in the top wall 24. That is, the range in which the internal fin 150 is provided in the case 2 is partially included in the range of the external duct 170.

  Further, the second external fin 161 is disposed at a position partially overlapping with the first internal fin 151 when viewed from the direction perpendicular to the wall surfaces of the connection wall portions 22 and 23. Specifically, the first external fin 161 is partially disposed at a position overlapping the first internal fin 151. The second external fins 162 are arranged at positions that partially overlap with the second internal fins 152 when viewed from the direction perpendicular to the wall surface of the top wall 24.

  As described above, according to the present embodiment, the internal fin range A1 is partially included in the external duct range A2. Therefore, in a situation where the external blower 172 is stopped, the external duct 170 is prevented from hindering heat radiation from the case 2 as compared with the case where the entire internal fin range A1 is located in the external duct range A2. it can. However, in the situation where the external blower 172 is operated, the heat transferred to the case 2 through the first internal fins 151 compared to the case where the entire internal fin range A1 is located outside the external duct range A2, It becomes easy to be transmitted to the first external fin 161. Therefore, the amount of heat released from case 2 can be increased.

(Other embodiments)
In addition, this invention is not limited to the said Example, As long as it belongs to the technical scope of this invention, you may deform | transform as follows.

  In the first embodiment, the first region 501 is formed in the connection wall side passage 50, but it may be formed in at least one of the fluid passages 5.

  In the first embodiment, the fluid flows in the first region 501 to the top wall side end portion 222 substantially in parallel with the inflow direction, but there may be a portion that is not parallel due to a curve or the like in the middle.

  In the first embodiment, the vertical width of the first region 501 is equal to the vertical width of the connection wall side passage 50 at the downstream end 50 </ b> A of the connection wall side passage 50. However, as shown in FIG. 8, at the downstream end 50 </ b> A of the connection wall side passage 50, the vertical width of the first region 501 may be smaller than the vertical width of the connection wall side passage 50. In this case, the filling member 9 is disposed between the end portion of the first region 501 on the side opposite to the side wall 21 of the blower 21 and the bottom wall 25. The stuffing member 9 is for preventing fluid from flowing in between the end of the first region 501 on the side opposite to the side wall 21 of the blower 21 and the bottom wall 25, and the material is not limited.

  In the above embodiment, each of the first region 501 and the third region 521 has a substantially triangular shape when viewed from a specific direction, but may have a staircase shape as shown in FIG. .

  In the above embodiment, an example of a plate fin is shown as the fins 221 and 241, but other types of fins such as a louver fin may be used as long as the fluid can pass between the fins in a direction substantially parallel to the inflow direction into the inflow port 223. .

  In the second embodiment, the shape of the first region 501 when viewed from the stacking direction is different from the substantially triangular shape in the first embodiment, but may be the same shape as the first embodiment.

  In the second embodiment, the third region 521 is formed continuously with the first region 501, but may be close to the first region 501. In this case, the fourth region 522 partially exists between the third region 521 and the first region 501.

  In the second embodiment, the inclination angles α, β, and γ are all the same angle, but may be different.

  -Although the external fin 160 which concerns on the said 3rd Embodiment is a corrugated fin in which the louver 160a was formed, it may replace with the louver 160a and may be a corrugated fin in which the slit was formed, and the louver 160a is formed. There may be no corrugated fins. Further, the external fin 160 may be a straight fin such as the internal fins 151 and 152.

  -The 1st fin 221 and the internal fin 150 are not limited to a straight fin, For example, a pin-shaped fin may be sufficient and a corrugated fin may be sufficient.

  As the fan built in the blower 4 provided inside the case 2, an axial fan, a turbo fan, or the like can be used in addition to the sirocco fan described in the first embodiment.

  The fins 221 and 241, the internal fins 150, and the external fins 160 in each of the above-described embodiments may be obtained by fixing fins that are separate parts to the wall of the case 2, or part of the wall of the case 2 May be formed into a fin shape to form a fin.

  -In each above-mentioned embodiment, case 2 forms a hexahedron and a rectangular parallelepiped, However, The housing | casing included in invention is not limited to this shape. For example, the case 2 may be a polyhedron having more than six surfaces, or at least one surface may include a curved surface. Further, the case 2 may be formed in a dome shape in which the top wall includes a curved surface, or the casing may have a trapezoidal vertical cross-sectional shape. Further, in the case 2, the top wall is a wall having a positional relationship facing the bottom wall, and the shape thereof may include either a flat shape or a curved shape. Further, in the case 2, the side wall may be a wall extending from the bottom wall in a direction intersecting the bottom wall, or may be a wall extending from the top wall in a direction intersecting the top wall. The boundary between the top wall and the side wall in the case 2 may form a corner or a curved surface. The boundary between the bottom wall and the side wall in the case 2 may form a corner or a curved surface.

  -In each above-mentioned embodiment, although the battery stack 3 contained in a battery pack is four pieces, it is not limited to this number. That is, when only one battery stack 3 included in the battery pack is accommodated inside the casing, or when a plurality of battery stacks 3 are installed side by side in one direction, a plurality of battery stacks 3 are also provided in other directions intersecting the one direction. This includes cases where they are installed side by side.

  In each of the above-described embodiments, the battery stack 3 is arranged in the case 2 so that the electrode terminal 71 faces the top wall 24. On the other hand, the battery stack 3 may be disposed in the case 2 in such a direction that the electrode terminal 71 faces the blower side wall portion 20, the anti-blower side wall portion 21, or the connection wall portions 22 and 23.

DESCRIPTION OF SYMBOLS 1 Battery pack, 22, 23 Connection wall part, 151 1st internal fin, 152 2nd internal fin, 221, 241 fin, 223 inflow port, 224 outflow port, 3 battery stack, 4 air blower, 42 sirocco fan, 5 fluid passage 50, 51 Connection wall side passage, 501 1st region, 502 2nd region, 52 Top wall side passage, 521 3rd region, 522 4th region, 7 Battery cell, 8 Collecting duct

Claims (10)

A plurality of batteries (7);
A housing (2) for housing a plurality of batteries;
Fluid circulating means (4) accommodated in the housing and circulating fluid for cooling the battery in the housing;
A first fluid passage (50) through which a fluid flows between a first inner wall surface (22) constituting the inner wall surface of the housing and the battery;
On the first inner wall surface, first fins (221, 151) for exchanging heat between the fluid and the first inner wall surface are formed to protrude,
The first fluid passage is partitioned into a first region (501) that is a space in which the first fin is disposed and a second region (502) that is a space in which the first fin is not disposed,
Fluid flows from the second region to the first region;
The first fin is formed to extend from an inlet (223) where fluid flows into the first region to an outlet (224) where fluid flows out of the first region;
An area of the inlet is larger than a cross-sectional area of the first fluid passage in the fluid flow direction;
A battery pack characterized by The first fluid passage has a long side in the fluid flow direction, and a short side in a direction perpendicular to both the fluid flow direction and the vertical direction of the first inner wall surface,
The first fin is formed so that fluid flows in the first region in parallel with the inflow direction to the first region;
The battery pack according to claim 1. The width of the first region in a direction orthogonal to both the fluid flow direction and the vertical direction of the first inner wall surface is such that the fluid flow direction and the first inner wall surface are downstream of the fluid flow direction. Equal to the width of the first fluid passage in a direction perpendicular to both the vertical direction;
The battery pack according to claim 1 or 2. An interval between the battery and the first fin is smaller than a protruding length of the first fin;
The battery pack according to any one of claims 1 to 3, wherein: A second fluid passage (52) formed between the battery and a second inner wall surface (24), which is another inner wall surface different from the first inner wall surface, through which fluid continuously flows from the first fluid passage. With
The second fluid passage includes a third region (521) in which a second fin (241, 152) for projecting heat is formed between the fluid and the second inner wall surface.
The third region is formed such that fluid flows continuously from the first region,
The path length of the fluid from the fluid inlet to the first region to the outlet from which the fluid flows out from the third region is equal regardless of the position of the inlet of the first region;
The battery pack according to any one of claims 1 to 4, wherein: An interval between the battery and the second fin is smaller than a protruding length of the second fin;
The battery pack according to claim 5. An external duct (170) attached to the outer surface of the housing;
An external blower (172) for blowing air to the external duct;
An external fin (160) located inside the external duct and projecting from the outer surface of the housing;
With
Of the casing, when the range where the first fin is formed is the internal fin range (A1) and the portion covered with the external duct is the external duct range (A2), The battery pack according to claim 1, wherein the battery pack is entirely included in the external duct range. An external duct (170) attached to the outer surface of the housing;
An external blower (172) for blowing air to the external duct;
An external fin (160) located inside the external duct and projecting from the outer surface of the housing;
With
In the case, when the range where the first fin is formed is the internal fin range (A1) and the portion covered with the external duct is the external duct range (A2), the internal fin range is The battery pack according to claim 1, wherein the battery pack is partially included in the external duct range. An external duct (170) attached to the outer surface of the housing;
An external blower (172) for blowing air to the external duct;
An external fin (160) located inside the external duct and projecting from the outer surface of the housing;
With
Of the casing, when the range where the first fin is formed is the internal fin range (A1) and the portion covered with the external duct is the external duct range (A2), The battery pack according to any one of claims 1 to 6, wherein the battery pack is entirely located outside the outer duct range. A plurality of batteries (7);
A housing (2) for housing a plurality of batteries;
A blower (4) for circulating a fluid for cooling the battery in the housing;
A passage formed between the inner wall surface (22) of the casing and the battery, and a fluid passage (50, 51) extending in a predetermined direction along the inner wall surface;
A plurality of fins (221, 151) projecting from the inner wall surface to the fluid passage;
A blower duct (46) connected to the blower and having an outlet (46a) for blowing out the fluid blown from the blower to the fluid passage;
With
The outlet is in a shape extending along the inner wall surface in a direction intersecting the predetermined direction, and is arranged in a direction to blow out the fluid in the predetermined direction,
The fluid flowing out from the outlet is configured to flow obliquely with respect to an inflow surface (503) formed by upstream ends of the plurality of fins;
A battery pack characterized by

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