Battery pack

Abstract

To provide a battery pack capable of suppressing rigidity reduction of a bracket, which is provided in the middle of a flow passage and includes an opening, and sufficiently securing a seal performance of the flow passage in which cooling air flows.SOLUTION: A battery pack 10 comprises: a battery module 20; a right-side battery bracket 27 which supports the battery module 20 and includes an opening 27a; a downstream-side air duct 51 which supplies cooling air to the battery module 20; and an upstream-side air duct 52 which guides the cooling air to the downstream-side air duct 51. The upstream-side air duct 52 includes a cylindrical part 521, which is inserted through the opening 27a, and a flange part 522. The opening 27a is smaller than an outer edge of the flange part 522. The downstream-side air duct 51 and the upstream-side air duct 52 are connected in an airtight state by a seal member 55 which is disposed between an upstream end of the downstream-side air duct 51 and the flange part 522 of the upstream-side air duct 52.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a battery pack to be mounted on a vehicle. [Background technology]

[0002] In recent years, research and development has been conducted into secondary cells (also called batteries) that contribute to energy efficiency in order to ensure that more people have access to affordable, reliable, sustainable and advanced energy.

[0003] As the drive source of a vehicle is electrified, the vehicle is equipped with a battery pack that houses a battery that supplies power to a motor, etc. The battery pack is equipped with a cooling device that cools the battery, and for example, an air-cooled cooling device that uses a fan to draw in cooling air from the vehicle interior and blows the cooling air to the battery to cool the battery is widely used (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Utility Model Application Publication No. 6-2776 Summary of the Invention [Problem to be solved by the invention]

[0005] In an air-cooled cooling device, the flow path through which the cooling air flows may be formed by connecting multiple ducts. Also, if another component (a component other than the duct) is provided in the middle of the flow path, it is necessary to provide an opening in that component. In such a case, it is desirable to suppress the decrease in rigidity of the component due to the provision of the opening, and to sufficiently ensure the sealing performance of the flow path formed by connecting multiple ducts.

[0006] The present invention provides a battery pack that can suppress a decrease in rigidity of a bracket that is provided midway through a flow path and has an opening, while also ensuring sufficient sealing performance of the flow path through which cooling air flows. [Means for solving the problem]

[0007] The present invention relates to A battery pack mounted on a vehicle, Case and A battery module accommodated in the case; and A bracket supporting one end side of the battery module and having an opening; A fan that blows cooling air to the battery module; a downstream duct facing the battery module and supplying the cooling air to the battery module; an upstream duct that guides the cooling air blown by the fan to the downstream duct, The upstream duct is A cylindrical portion that is inserted into the opening of the bracket; a flange portion disposed on the downstream duct side relative to the bracket, The opening of the bracket is smaller than an outer edge of the flange portion, The downstream duct and the upstream duct are airtightly connected by a seal member disposed between the upstream end of the downstream duct and the flange portion of the upstream duct. Effect of the Invention

[0008] According to the present invention, it is possible to suppress a decrease in rigidity of a bracket that is provided midway through a flow passage and has an opening, and to sufficiently ensure the sealing performance of the flow passage through which cooling air flows. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a diagram showing a battery pack 10 according to an embodiment of the present invention, which is disposed under a rear seat 2 of a vehicle 1. [Diagram 2] 2 is a top view of the battery pack 10 fixed to the side frame 5. FIG. [Diagram 3] FIG. 2 is an exploded perspective view of the battery pack 10. [Figure 4] 2 is a perspective view of the battery module 20, the right battery bracket 27, and the air duct 50 after assembly. FIG. [Diagram 5] 2 is an exploded perspective view of the battery module 20, the right battery bracket 27, and the air duct 50 before they are assembled. FIG. [Figure 6] 5 is a cross-sectional view taken along line AA in FIG. 4. [Figure 7] 1 is a diagram showing a comparative example 1 regarding the connection between a downstream air blower duct 51 and an upstream air blower duct 52. FIG. [Figure 8] 13 is a diagram showing a second comparative example regarding the connection between a downstream air blower duct 51 and an upstream air blower duct 52. FIG. [Figure 9] 13 is a diagram showing a first modified example of an upstream air blower duct 52. FIG. [Figure 10] 13 is a diagram showing a second modified example of the upstream air blower duct 52 and the right battery bracket 27. FIG. [Figure 11] 13 is a diagram showing a third modified example of the upstream air blower duct 52 and the right battery bracket 27. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of the battery pack of the present invention will be described with reference to the accompanying drawings. The drawings are to be viewed in the direction of the reference symbols. In this specification and the like, for the sake of simplicity and clarity, the front / rear, left / right, and up / down directions are described according to the direction as seen by the driver of the vehicle, and in the drawings, the front of the vehicle is indicated as Fr, the rear as Rr, the left as L, the right as R, the top as U, and the bottom as D.

[0011] 1, a battery pack 10 according to an embodiment of the present invention is disposed, for example, below the rear seat 2 and luggage compartment 4 of a vehicle 1. Specifically, a recess is provided below the rear seat 2 and luggage compartment 4, and the battery pack 10 is disposed in the recess with vehicle body fixing parts 91, 92 (described later) provided at both left and right ends fixed to a pair of side frames 5 of the vehicle body. The vehicle 1 is, for example, an electric vehicle such as a hybrid vehicle, a battery-powered electric vehicle, or a fuel cell vehicle.

[0012] As shown in Fig. 2, an intake duct 16 and an exhaust duct 18 are connected to the battery pack 10. Cooling air in the vehicle cabin is introduced from the intake duct 16 into the battery pack 10 to cool a battery module 20 (described later), and then exhausted from the exhaust duct 18 to the vehicle cabin. One end of the intake duct 16 is connected to an intake duct connector 15 provided on the front right side of the battery pack 10. The other end of the intake duct 16 is provided with an intake inlet 16a that opens to the right. One end of the exhaust duct 18 is connected to an exhaust duct connector 17 provided on the front left side of the battery pack 10, and is disposed below the rear seat 2.

[0013] As shown in FIG. 3, the battery pack 10 includes two battery modules 20, a battery ECU (Electronic Control Unit) 21, a junction box 23, a battery cooling mechanism 40, and a case 11 that houses these components.

[0014] (case) Case 11 constitutes the exterior of battery pack 10 and houses battery module 20 and the like. Case 11 has tray-shaped case body 12 and cover 13 that covers case body 12 from above. Cover 13 is disposed such that its outer edge faces the outer edge of case body 12 via a sealing member (not shown), and covers case body 12 from above on which various components are mounted.

[0015] (Battery module) The two battery modules 20 are disposed on the left side of the case body 12. Each battery module 20 is configured by stacking a plurality of battery cells (not shown) in the left-right direction. The two battery modules 20 are electrically connected to each other via electrical connection members (not shown). Electricity stored in the battery modules 20 is supplied to a motor or the like that serves as a drive source for the vehicle 1.

[0016] The two battery modules 20 are disposed spaced apart in the front-rear direction, and a downstream air-blowing duct 51, which will be described later, is provided between them. In addition, as shown in Fig. 3 and Fig. 4, a pair of left and right battery brackets 25, 27 are provided at both left and right ends of the two battery modules 20.

[0017] The left battery bracket 25 is attached to the left end of the battery module 20. The left battery bracket 25 also has a vehicle body fixing part 91 that is fixed to the side frame 5 of the vehicle body. The vehicle body fixing part 91 has a bolt insertion hole and is a fixing point that fixes the battery pack 10 to the side frame 5 (see FIG. 2).

[0018] The right side battery bracket 27 has a first bracket 271 , a second bracket 273 , and a third bracket 275 .

[0019] The first bracket 271 is attached to the front battery module 20. When viewed from the left-right direction, the first bracket 271 extends in the front-rear direction to a position where it overlaps with a part of the rear battery module 20.

[0020] The second bracket 273 is attached to the rear battery module 20. The first bracket 271 and the second bracket 273 have a fixing portion 272 that is fixed to each other by a bolt or the like.

[0021] The third bracket 275 is disposed on the right side of the first bracket 271 and the second bracket 273, and is fixed to the first bracket 271 and the second bracket 273. The third bracket 275 has a vehicle body fixing portion 92 that is fixed to a side frame 5 of the vehicle body. The vehicle body fixing portion 92 has a bolt insertion hole, and is a fixing point that fixes the battery pack 10 to the side frame 5 (see FIG. 2). In addition, the third bracket 275 supports a fan 41, which will be described later, from below.

[0022] In this embodiment, the right side battery bracket 27 is composed of three brackets, namely, the first bracket 271, the second bracket 273, and the third bracket 275, but is not limited to this and may be composed of one bracket, or may be composed of two or four or more brackets.

[0023] In this way, the two battery modules 20 are integrally supported on the side frame 5 of the vehicle body by the left battery bracket 25 and the right battery bracket 27. In addition, the left battery bracket 25 and the right battery bracket 27 are fixed to the case 11, and the case 11 houses the battery module 20 supported by the side frame 5 from below.

[0024] (Battery ECU) 3, the battery ECU 21 is a control device that controls charging and discharging of the battery module 20, and includes a processor, a memory, an interface, etc. The battery ECU 21 is mounted on an ECU fixing bracket 22 provided above the fan 41 and the right battery bracket 27.

[0025] (Junction box) The junction box 23 electrically connects the battery module 20 to an external device (not shown) and includes wiring components through which charging power and discharging power of the battery module 20 flows. The junction box 23 is placed on a junction box bracket 24 attached to the upper surface of the battery module 20.

[0026] (Battery cooling mechanism) The battery cooling mechanism 40 includes a fan 41, an intake duct 60, and an air blower duct 50.

[0027] The fan 41 is disposed upstream of the battery module 20, and draws in cooling air from outside the battery pack 10 and blows the cooling air to the battery module 20. The fan 41 is, for example, a sirocco fan. The fan 41 has an intake port 42 that opens downward and an outlet port 43 that is provided in the centrifugal direction. The intake port 42 is connected to an intake duct 60, and the outlet port 43 is connected to an air supply duct 50.

[0028] A third bracket 275 of the right-side battery bracket 27 is provided below the fan 41. The third bracket 275 has an opening that communicates with the suction port 42 of the fan 41, and supports the fan 41 from below with the suction port 42 facing downward.

[0029] Air intake duct 60 is provided upstream of fan 41, connects air intake duct connection part 15 and suction port 42 of fan 41, and is a flow path through which cooling air taken in by fan 41 flows. Here, air intake duct 16 is disposed outside case 11, whereas air intake duct 60 is disposed inside case 11.

[0030] The air supply duct 50 is provided downstream of the fan 41, and supplies the cooling air blown from the fan 41 to the battery module 20. The air supply duct 50 communicates with the gap between adjacent battery cells (hereinafter also referred to as an inter-cell flow path), and as shown by the flow of cooling air indicated by the thick arrows in Fig. 6 (similar to Figs. 7 and 8), the cooling air flowing through the air supply duct 50 flows into the inter-cell flow path, thereby cooling the battery module 20.

[0031] As shown in Figures 4 and 5, the air supply duct 50 faces the battery module 20 and has a downstream air supply duct 51 that supplies cooling air to the battery module 20, and an upstream air supply duct 52 that guides the cooling air blown from the fan 41 to the downstream air supply duct 51.

[0032] The downstream air blowing duct 51 is disposed between the two battery modules 20. The downstream air blowing duct 51 has a substantially rectangular parallelepiped shape and has an upper surface, a lower surface, a left surface, and a right surface. An inlet 51a is provided at a right end portion 511 of the downstream air blowing duct 51, and is connected to the upstream air blowing duct 52. Meanwhile, a front portion 512 and a rear portion 513 of the downstream air blowing duct 51 are open and communicate with the inter-cell flow path of the battery module 20. A seal member 515 that abuts against the battery module 20 is provided at the outer edge portion of the front portion 512 and the rear portion 513 of the downstream air blowing duct 51, and prevents the cooling air from leaking out of the downstream air blowing duct 51 from the gap between the downstream air blowing duct 51 and the battery module 20. The seal member 515 is formed of a gas-impermeable material, for example, a rubber foam.

[0033] The upstream air blower duct 52 is connected to the air outlet 43 of the fan 41 and the downstream air blower duct 51. The upstream air blower duct 52 has a cylindrical portion 521 having a flow path formed therein, and a flange portion 522 provided at a downstream end portion (a left end portion in this embodiment) of the cylindrical portion 521. In this embodiment, the cylindrical portion 521 has a substantially rectangular cross section, but is not limited thereto and may have any cross-sectional shape (for example, a circular shape).

[0034] As described above, the right battery bracket 27 that supports the battery module 20 is provided at the right end of the battery module 20 and is disposed midway along the air flow path from the fan 41 to the battery module 20. The first bracket 271 has an opening 27a to connect the downstream air supply duct 51 and the upstream air supply duct 52 to supply cooling air from the fan 41 to the battery module 20.

[0035] The opening 27a of the right battery bracket 27 has approximately the same size as the cylindrical portion 521 of the upstream air supply duct 52. Also, the opening 27a has a generally rectangular cross section similar to the cylindrical portion 521. However, the cross-sectional shape of the opening 27a is not limited to this, and can be any shape to match the cross-sectional shape of the cylindrical portion 521.

[0036] The cylindrical portion 521 of the upstream air blower duct 52 is configured to be insertable into the opening 27a of the right battery bracket 27. On the other hand, the opening 27a is configured to be smaller than the outer edge of the flange portion 522 of the upstream air blower duct 52, that is, the flange portion 522 is configured to be unable to be inserted into the opening 27a.

[0037] 6 is a cross-sectional view of the line AA in FIG. 4, and shows an assembled state of the battery module 20, the right battery bracket 27, the downstream air blowing duct 51, and the upstream air blowing duct 52. As shown in FIG. 6, the cylindrical portion 521 of the upstream air blowing duct 52 is inserted into the opening 27a of the right battery bracket 27, and the flange portion 522 is disposed on the downstream air blowing duct 51 side of the right battery bracket 27. A seal member 55 is disposed between the right end portion 511 of the downstream air blowing duct 51 and the flange portion 522 of the upstream air blowing duct 52, and the downstream air blowing duct 51 and the upstream air blowing duct 52 are connected in an airtight state by the seal member 55. The seal member 55 is formed of a gas-impermeable material, for example, a rubber foam.

[0038] Here, the connection between the downstream air blowing duct 51 and the upstream air blowing duct 52 will be described. First, in a state where the right battery bracket 27 is not attached to the battery module 20, the cylindrical portion 521 of the upstream air blowing duct 52 is inserted into the opening 27a of the right battery bracket 27 from the battery module 20 side (here, the left side). The cylindrical portion 521 is inserted until the flange portion 522 abuts against the left surface of the right battery bracket 27. At this time, since the opening 27a has substantially the same size as the cylindrical portion 521, the right battery bracket 27 can stably hold the cylindrical portion 521. Furthermore, since the opening 27a and the cylindrical portion 521 have a substantially rectangular cross section, when the cylindrical portion 521 is inserted into the opening 27a, the opening 27a can hold the cylindrical portion 521 so as not to rotate around the axial direction. Then, after the upstream air blowing duct 52 is assembled to the right battery bracket 27, they are attached to the battery module 20. At this time, the downstream air blower duct 51 and the upstream air blower duct 52 are connected in an airtight state via the seal member 55 .

[0039] In this way, even if the right-side battery bracket 27 is provided between the downstream air supply duct 51 and the upstream air supply duct 52, the cylindrical portion 521 of the upstream air supply duct 52 can be inserted into the opening 27a of the right-side battery bracket 27 to directly connect the downstream air supply duct 51 and the upstream air supply duct 52 via the sealing member 55.

[0040] 7 shows Comparative Example 1 regarding the connection between the downstream air blowing duct 51 and the upstream air blowing duct 52. In Comparative Example 1, the downstream air blowing duct 51 is connected to the left surface of the right battery bracket 27 via a seal member 55A, and the upstream air blowing duct 52 is connected to the right surface of the right battery bracket 27 in a state attached to the battery module 20 via a seal member 55B. Since the upstream air blowing duct 52 is configured not to pass through the opening 27a of the right battery bracket 27, it is necessary to provide seal members 55A and 55B on the left and right surfaces of the right battery bracket 27, respectively, in order to connect the downstream air blowing duct 51 and the upstream air blowing duct 52 in an airtight state.

[0041] In general, even when a sealing member is provided, cooling air leaks from the sealing member, although the amount is small. Compared with the case where two sealing members 55A and 55B are provided as in Comparative Example 1, in this embodiment, the downstream air blower duct 51 and the upstream air blower duct 52 are connected in an airtight state by one sealing member 55, so that the amount of cooling air leaking from the sealing member can be reduced. That is, in this embodiment, the sealing performance of the flow path through which the cooling air flows can be sufficiently ensured. In addition, since there is no need to provide two sealing members, the manufacturing cost of the battery pack 10 can also be reduced.

[0042] In addition, in Comparative Example 1, the right battery bracket 27 and the two seal members 55A and 55B are disposed between the downstream air duct 51 and the upstream air duct 52, so that the flow path is long. On the other hand, in this embodiment, the downstream air duct 51 and the upstream air duct 52 are connected only via the seal member 55, so that the length of the flow path through which the cooling air flows is shorter than that of Comparative Example 1. This makes it possible to reduce the pressure loss and wind noise of the cooling air flowing through the flow path. Also, the inside of the battery pack 10 can be made compact in structure.

[0043] FIG. 8 shows Comparative Example 2 regarding the connection between the downstream air blower duct 51 and the upstream air blower duct 52. In Comparative Example 2, the upstream air blower duct 52 is inserted from the right side through the opening 27a of the right battery bracket 27 in a state where the right battery bracket 27 is attached to the battery module 20, and is connected to the downstream air blower duct 51 via a seal member 55. Unlike the present embodiment, Comparative Example 2 has an opening 27a having a size that allows the flange portion 522 to be inserted therethrough. Since the opening 27a of the present embodiment is smaller than the opening 27a of Comparative Example 2, the rigidity of the right battery bracket 27 of the present embodiment is greater than the rigidity of the right battery bracket 27 of Comparative Example 2. Therefore, in the present embodiment, it is possible to suppress a decrease in rigidity of the right battery bracket 27 due to the provision of the opening 27a.

[0044] (Variation 1) FIG. 9 is a diagram showing a first modified example of the upstream air blowing duct 52. As shown in FIG. 9, the upstream air blowing duct 52 may have an engagement claw 524 provided on the outer surface of the cylindrical portion 521. Specifically, the engagement claw 524 is provided to protrude from the outer surface of the cylindrical portion 521. In the example of FIG. 9, the engagement claw 524 is provided at two locations, the front surface and the rear surface of the cylindrical portion 521. When the cylindrical portion 521 is inserted into the opening 27a (left view of FIG. 9), the engagement claw 524 engages with the right battery bracket 27 after passing through the opening 27a (right view of FIG. 9). The right battery bracket 27 is sandwiched between the flange portion 522 and the engagement claw 524 in the insertion direction (right direction) of the cylindrical portion 521, and the upstream air blowing duct 52 is fixed to the right battery bracket 27.

[0045] In this manner, by the engagement claws 524 of the upstream air duct 52 engaging with the right battery bracket 27, the upstream air duct 52 is positioned relative to the right battery bracket 27 in the insertion direction.

[0046] (Variation 2) Fig. 10 is a diagram showing a second modified example of the upstream air supply duct 52 and the right battery bracket 27. In the second modified example, the upstream air supply duct 52 has an engaging claw 524 as in the first modified example, and the right battery bracket 27 has an engaged hole 27b provided in the opening 27a and recessed in the protruding direction of the engaging claw 524. In the example shown in Fig. 10, the engaging claws 524 are provided in two places on the front and rear surfaces of the cylindrical portion 521. When the cylindrical portion 521 is inserted into the opening 27a (left view of Fig. 10), the engaging claws 524 engage with the engaged hole 27b (right view of Fig. 10).

[0047] In this manner, the engaging claws 524 of the upstream air-blowing duct 52 engage with the engaged holes 27b of the right battery bracket 27, so that the upstream air-blowing duct 52 is positioned relative to the right battery bracket 27 in the insertion direction.

[0048] In addition, in variant example 2, the upstream air duct 52 has an engaging claw 524, and the right-side battery bracket 27 has an engaged hole 27b, but this is not limited to this, and the upstream air duct 52 may have an engaged hole provided on the outer surface, and the right-side battery bracket 27 may have an engaging claw that engages with the engaged hole.

[0049] (Variation 3) 11 is a diagram showing a third modified example of the upstream air-blowing duct 52 and the right-side battery bracket 27. In the third modified example, the upstream air-blowing duct 52 has an engaging pin 526 extending from the flange portion 522 in the insertion direction, and the right-side battery bracket 27 has an engaged hole 27c into which the engaging pin 526 is press-fitted. When the cylindrical portion 521 is inserted into the opening 27a (left view of FIG. 11), the engaging pin 526 is press-fitted into and engaged with the engaged hole 27c (right view of FIG. 11).

[0050] The engagement pin 526 of the upstream air duct 52 engages with the engagement hole 27c of the right battery bracket 27, whereby the upstream air duct 52 is positioned relative to the right battery bracket 27 in the insertion direction.

[0051] In addition, in the third modified example, the upstream air duct 52 has an engagement pin 526 and the right side battery bracket 27 has an engaged hole 27c, but this is not limited to the above, and the right side battery bracket 27 may have an engagement pin and the upstream air duct 52 may have an engaged hole provided in the flange portion 522.

[0052] Although one embodiment of the present invention and each modification have been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to such an embodiment. It is clear that a person skilled in the art can come up with various modified or altered examples within the scope of the claims, and it is understood that these also naturally belong to the technical scope of the present invention. In addition, the components in the above embodiment may be arbitrarily combined within the scope of the invention.

[0053] This specification describes at least the following items. In parentheses, components corresponding to the above-described embodiments are shown as examples, but the present invention is not limited to these.

[0054] (1) A battery pack (battery pack 10) mounted on a vehicle (vehicle 1), Case (Case 11) and A battery module (battery module 20) accommodated in the case; A bracket (right battery bracket 27) that supports one end side of the battery module and has an opening (opening 27a); A fan (fan 41) that blows cooling air to the battery module; a downstream duct (downstream air blowing duct 51) facing the battery module and supplying the cooling air to the battery module; an upstream duct (upstream blower duct 52) ​​that guides the cooling air blown from the fan to the downstream duct, The upstream duct is A cylindrical portion (cylindrical portion 521) that is inserted into the opening of the bracket; A flange portion (flange portion 522) is disposed on the downstream duct side relative to the bracket, The opening of the bracket is smaller than an outer edge of the flange portion, The downstream duct and the upstream duct are airtightly connected by a seal member (seal member 55) disposed between the upstream end portion (right end portion 511) of the downstream duct and the flange portion of the upstream duct. Battery pack.

[0055] According to (1), the upstream duct is inserted into an opening provided in a bracket supporting one end of the battery module and is connected to the downstream duct in an airtight state by a seal member, so that the sealing performance of the flow path through which the cooling air flows can be sufficiently ensured. Also, since the opening in the bracket is smaller than the outer edge of the flange portion of the upstream duct, a decrease in the rigidity of the bracket due to the opening can be suppressed.

[0056] (2) A battery pack according to (1), The bracket has a vehicle body fixing portion (vehicle body fixing portion 92) that is fixed to a frame member (side frame 5) of the vehicle. Battery pack.

[0057] According to (2), the bracket supports the battery module on a frame member of the vehicle.

[0058] (3) A battery pack according to (1) or (2), The opening of the bracket has approximately the same size as the cylindrical portion of the upstream duct. Battery pack.

[0059] According to (3), the bracket can stably hold the cylindrical portion of the upstream duct inserted into the opening.

[0060] (4) A battery pack according to any one of (1) to (3), One of the upstream duct and the bracket has an engagement portion (engagement claw 524, engagement pin 526), the engaging portion engages with the other of the upstream duct and the bracket; Battery pack.

[0061] According to (4), the upstream duct can be positioned relative to the bracket in the insertion direction.

[0062] (5) A battery pack according to any one of (1) to (4), The battery module includes a first battery module (a front battery module 20) and a second battery module (a rear battery module 20) in which a plurality of battery cells are stacked and which are spaced apart from each other in a direction perpendicular to a stacking direction of the battery cells, The downstream duct is disposed between the first battery module and the second battery module and communicates with a gap between adjacent battery cells. Battery pack.

[0063] According to (5), cooling air can be supplied from the downstream duct disposed between the two battery modules 20 to the gap between the battery cells. [Explanation of symbols]

[0064] 1 vehicle 5 Side frame 10 Battery pack 11 Cases 20 Battery Module 27 Right side battery bracket (bracket) 27a aperture 41 Fan 51 Downstream ventilation duct (downstream duct) 511 Right end (upstream end) 52 Upstream ventilation duct (upstream duct) 521 Cylindrical part 522 Flange part 524 Engagement claw (engagement part) 526 Engagement pin (engagement part) 55 Sealing material 91 Body fixing part

Claims

1. A battery pack mounted on a vehicle, Case and A battery module accommodated in the case; and A bracket supporting one end side of the battery module and having an opening; A fan that blows cooling air to the battery module; a downstream duct facing the battery module and supplying the cooling air to the battery module; an upstream duct that guides the cooling air blown by the fan to the downstream duct, The upstream duct is A cylindrical portion that is inserted into the opening of the bracket; a flange portion disposed on the downstream duct side relative to the bracket, The opening of the bracket is smaller than an outer edge of the flange portion, the downstream duct and the upstream duct are airtightly connected by a seal member disposed between the upstream end of the downstream duct and the flange portion of the upstream duct. Battery pack.

2. 2. The battery pack according to claim 1, The bracket has a vehicle body fixing portion that is fixed to a frame member of the vehicle. Battery pack.

3. 3. The battery pack according to claim 1, The opening of the bracket has approximately the same size as the cylindrical portion of the upstream duct. Battery pack.

4. 3. The battery pack according to claim 1, one of the upstream duct and the bracket has an engagement portion, the engaging portion engages with the other of the upstream duct and the bracket; Battery pack.

5. 3. The battery pack according to claim 1, The battery module includes a first battery module and a second battery module, each of which includes a plurality of stacked battery cells, the first battery module and the second battery module being spaced apart from each other in a direction perpendicular to a stacking direction of the battery cells; the downstream duct is disposed between the first battery module and the second battery module and communicates with a gap between adjacent battery cells; Battery pack.

Images