Battery pack

Abstract

To provide a battery pack which can prevent gas from being directly discharged into an indoor space even when a gas tube, for flowing the gas generated from battery cells, is removed from a connection point.SOLUTION: A battery pack 10 comprises: a case 17 which is mounted in an indoor space 2 of a vehicle 1; a battery module 30 in which a plurality of battery cells 31 each having a gas discharge valve 31a are stacked; a gas discharge duct 32 which connects the gas discharge valves 31a; a gas tube 40 which is connected to the gas discharge duct 32 so as to guide, to the outside of the case 17, gas discharged from the battery cells 31; and a discharge part 50, provided in the indoor space 2 outside the case 17, and connected to the gas tube 40 so as to discharge the gas to the outside of the indoor space 2. The connection between the discharge part 50 and the gas tube 40 is stronger than that between the gas discharge duct 32 and the gas tube 40.SELECTED DRAWING: Figure 3

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 on 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. For example, a battery is composed of multiple stacked battery cells and is installed in an electrically powered vehicle such as a battery electric vehicle or a hybrid vehicle as a battery pack.

[0003] The battery cell is provided with a gas release valve that releases the gas generated inside the battery cell to the outside when the internal pressure of the gas generated inside rises to a predetermined value or higher due to aging or some other abnormality. For example, Patent Document 1 describes a battery pack that includes a plurality of battery cells each provided with a safety valve, a gas cover having an exhaust portion and sealing the safety valve of the battery cell so as to expose it in a flow path communicating with the exhaust portion, and a gas exhaust pipe made of an elastic material and connected to the exhaust portion of the gas cover. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2020-123516 A Summary of the Invention [Problem to be solved by the invention]

[0005] Since the gas generated from the battery cells is hot, when the battery pack is disposed in the interior space of a vehicle, the gas is discharged to the outside of the interior space through, for example, a gas tube. At this time, even if the gas tube is disconnected from the connection point, it is required that the hot gas is not discharged directly into the interior space.

[0006] The present invention provides a battery pack that can prevent gas from being directly discharged into an indoor space even if a gas tube through which gas generated from a battery cell flows becomes detached from a connection point. [Means for solving the problem]

[0007] The present invention relates to a case that is placed in an interior space of a vehicle and has a case body and a cover that covers the case body; At least one cell stack in which a plurality of battery cells each having a gas release valve are stacked and housed in the case; a gas release duct housed in the case and connecting the gas release valves of the plurality of battery cells; a gas tube connected to the gas release duct for guiding the gas released from the battery cell to the outside of the case; a discharge part provided in the interior space outside the case, connected to the gas tube, and configured to discharge the gas flowing through the gas tube to the outside of the interior space, The connection between the exhaust and the gas tube is stronger than the connection between the gas discharge duct and the gas tube. Effect of the Invention

[0008] According to the present invention, even if the gas tube through which gas generated from the battery cell flows becomes detached from the connection portion, the gas can be prevented from being directly discharged into the indoor space. [Brief description of the drawings]

[0009] [Figure 1] 1 is a perspective view of a battery pack 10 according to an embodiment of the present invention mounted on a vehicle 1. FIG. [Diagram 2] FIG. 2 is an exploded perspective view of the battery pack 10. [Diagram 3] 1 is a top view showing the arrangement of the gas discharge duct 32, the gas tube 40, and the exhaust section 50. FIG. [Figure 4] 1 is a cross-sectional view of a connection portion 33 of a gas discharge duct 32 connected to a gas tube 40 (specifically, upstream tubes 41, 42). [Diagram 5] 1 is a cross-sectional view of a connection portion 53 of a discharge portion 50 that is connected to a gas tube 40 (specifically, a downstream tube 43). [Figure 6] 13 is a diagram showing forces (thick solid arrows) applied to the upstream tubes 41, 42 and the joint member 60 when gas (dotted arrows) is released from the gas release valve 31a of the battery module 30A. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] A battery pack according to an embodiment of the present invention will be described below with reference to the accompanying drawings. In this embodiment, the battery pack is mounted on a vehicle. 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] [Overall configuration of the battery pack] 1, a battery pack 10 is mounted on a vehicle 1. The vehicle 1 is an electric vehicle such as a battery-powered electric vehicle or a hybrid vehicle, and is configured to be capable of running by driving a motor (not shown) with electric power stored in the battery pack 10.

[0012] The battery pack 10 is placed in an interior space 2 of the vehicle 1, which includes a passenger compartment CB where passengers sit and a luggage compartment LG where luggage is loaded. More specifically, the battery pack 10 is placed in an accommodation recess (not shown) recessed in a floor panel 3. The floor panel 3 has a front floor panel 3a constituting the floor of the passenger compartment CB and a rear floor panel 3b constituting the floor of the luggage compartment LG provided behind the passenger compartment CB, and the accommodation recess is provided at the front end of the rear floor panel 3b. The front floor panel 3a and the rear floor panel 3b are connected at a position below the rear seat (not shown), i.e., the battery pack 10 is provided at a position below the rear seat.

[0013] As shown in FIG. 2, the battery pack 10 includes a battery module 30, a fan 12 that blows out cooling air to cool the battery module 30, an intake duct 13 attached upstream of the fan 12, an air supply duct 14 attached downstream of the fan 12, a battery ECU (Electronic Control Unit) 15 that controls charging and discharging of the battery module 30, a junction board 16 that electrically connects the battery module 30 to an external device (not shown), and a case 17 that houses these components.

[0014] The case 17 has a tray-shaped case body 171 and a cover 172 that covers the case body 171 from above. The battery module 30, the fan 12, and the air duct 14 are placed on the case body 171. The cover 172 covers the case body 171 and is fixed to the floor panel 3. An air intake 17a is formed in the front surface of the cover 172, and the air intake 17a is covered by a ventilated grill 18. The air intake 17a communicates with the interior space 2, particularly the vehicle compartment CB, and air within the vehicle compartment CB is drawn into the battery pack 10 from the air intake 17a by the fan 12.

[0015] The two battery modules 30 are arranged side by side in the front-rear direction and fixed to the case body 171. Hereinafter, the battery module 30 arranged on the front side may also be referred to as battery module 30A, and the battery module 30 arranged on the rear side may also be referred to as battery module 30B.

[0016] 3, each of the battery modules 30A, 30B has a plurality of battery cells 31 stacked in the left-right direction. Each battery cell 31 has a positive terminal and a negative terminal (not shown), and is, for example, a rectangular cell.

[0017] Each battery cell 31 has a gas release valve 31a that releases high-temperature and high-pressure gas (hereinafter also simply referred to as gas) generated in the battery cell 31 to the outside of the battery cell 31. The gas release valve 31a of the battery module 30A is provided on the front surface of each battery cell 31, and the gas release valve 31a of the battery module 30B is provided on the rear surface of each battery cell 31. If the internal pressure of the gas generated in the battery cell 31 rises to or exceeds a predetermined value due to some abnormality, the gas release valve 31a opens to release the gas generated in the battery cell 31 to the outside of the battery cell 31 to prevent damage to the battery cell 31.

[0018] Further, each battery module 30A, 30B is provided with a gas release duct 32 connecting the gas release valves 31a of the multiple battery cells 31. The gas release duct 32 is provided on the front surface of the battery module 30A and the rear surface of the battery module 30B, respectively, and extends in the stacking direction (i.e., the left-right direction) of the battery cells 31. A gas tube 40, which will be described later, is connected to the gas release duct 32, and the gas released from the battery cells 31 is guided to the outside of the case 17 by the gas tube 40. Note that the gas tube 40 is not shown in FIG. 2.

[0019] Returning to FIG. 2, fan 12 is, for example, a sirocco fan having a rotation axis in the vertical direction, which draws in cooling air from an intake port 12a provided at the top and blows the cooling air out from an exhaust port 12b provided in the centrifugal direction into air duct 14.

[0020] The intake duct 13 connects the intake port 17a provided in the cover 172 and the suction port 12a of the fan 12. The intake duct 13 guides the air in the indoor space 2 as cooling air from the intake port 17a to the fan 12. In this embodiment, the intake duct 13 includes an upstream duct member 131 and a downstream duct member 132. The upstream duct member 131 is connected to the intake port 17a and is disposed above the battery module 30. The downstream duct member 132 is connected to the suction port 12a of the fan 12 and is disposed to the right of the battery module 30. The intake duct 13 may be configured of one duct member or three or more duct members.

[0021] The air duct 14 is provided between the battery module 30 and the fan 12, and is connected to the air outlet 12b of the fan 12. The air duct 14 sends out the cooling air blown out from the air outlet 12b along the lower surface of the battery module 30. The cooling air sent out below the battery module 30 flows from the bottom to the top through inter-cell flow paths (not shown) formed between adjacent battery cells 31, cools the battery module 30, and is discharged from the upper surface of the battery module 30. The cooling air is then diffused within the case 17, and is discharged to the outside of the case 17 through a gap between the case body 171 and the cover 172, as indicated by the thick arrow in FIG. 1.

[0022] The battery ECU 15 is placed on a bracket 19 attached to the battery module 30, and is disposed between the upstream duct member 131 and the battery module 30. The battery ECU 15 includes a processor, a memory, an interface, and the like.

[0023] The junction board 16 includes wiring components through which charging power and discharging power of the battery module 30 flows. The junction board 16 is disposed above the downstream duct member 132 and to the right of the upstream duct member 131. The junction board 16 is placed on a bracket 20 provided above the downstream duct member 132.

[0024] [Gas exhaust structure] Next, a gas exhaust structure for exhausting gas generated in the battery cell 31 to the outside of the indoor space 2 will be described with reference to FIGS.

[0025] As shown in FIG. 3, the battery pack 10 has, as its gas exhaust structure, the aforementioned gas release duct 32, a gas tube 40 connected to the gas release duct 32 and guiding the gas released from the battery cell 31 to the outside of the case 17, and an exhaust section 50 provided in the vehicle compartment CB outside the case 17, connected to the gas tube 40, and exhausting the gas flowing through the gas tube 40 to the outside of the vehicle compartment CB.

[0026] As described above, the gas release duct 32 is provided in each of the battery modules 30A and 30B. The gas release duct 32 has a connection portion 33 at the left end portion thereof that connects to the gas tube 40. The connection portion 33 has a cylindrical shape and extends to the left.

[0027] The gas tube 40 is a flexible member, and is formed of, for example, rubber. The gas tube 40 is connected to the gas discharge duct 32 and the exhaust part 50, and guides the gas to the exhaust part 50.

[0028] The gas tube 40 includes an upstream tube 41 connected to the gas discharge duct 32 of the battery module 30A, an upstream tube 42 connected to the gas discharge duct 32 of the battery module 30B, and a downstream tube 43 connected to the discharge section 50. The upstream tubes 41, 42 and downstream tube 43 are all the same type of tube and have the same inner diameter, but may have different longitudinal lengths.

[0029] The upstream tubes 41, 42 and the downstream tube 43 are connected to each other via a joint member 60 fixed to the inside of the case 17. The joint member 60 is made of, for example, resin.

[0030] The joint member 60 is disposed at a position spaced to the left of the battery modules 30A, 30B, and is disposed between the battery modules 30A, 30B in the front-rear direction. By disposing the joint member 60 in this manner, the joint member 60, the upstream tube 41, and the upstream tube 42 can be disposed in a well-balanced manner.

[0031] The joint member 60 has an approximately T-shaped flow passage formed therein, and has an upstream portion 61 extending in the front-rear direction, and a downstream portion 62 extending leftward from the center of the upstream portion 61 in the front-rear direction. The upstream tubes 41, 42 are connected to the front and rear ends of the upstream portion 61 of the joint member 60, respectively, and the upstream tubes 41, 42 and the joint member 60 are arranged in an approximately U-shape in top view. The downstream tube 43 is connected to the downstream portion 62 of the joint member 60, and extends to the outside of the case 17.

[0032] Further, a check valve (not shown) is provided at the downstream portion 62 of the joint member 60, which allows gas to flow from the upstream side to the downstream side and blocks gas from flowing in the opposite direction.

[0033] The discharge unit 50 is provided in the vehicle compartment CB outside the case 17, and is attached to the body of the vehicle 1. In this embodiment, the discharge unit 50 is attached to the vehicle body at a position to the left and rear of the joint member 60.

[0034] The discharge portion 50 has a connection portion 53 that connects to the downstream tube 43, and a discharge port 54 that communicates with the outside of the vehicle compartment CB. The discharge portion 50 has a substantially L-shaped flow path from the connection portion 53 to the discharge port 54. The discharge portion 50 is attached, for example, to a cross member (not shown) that is a part of the vehicle body, and the discharge port 54 communicates with the inside of the cross member.

[0035] Here, the connection between the gas discharge duct 32 and the gas tube 40, and the connection between the exhaust part 50 and the gas tube 40 will be described with reference to FIGS.

[0036] As shown in FIG. 4, the gas release duct 32 has a protruding portion 35 that protrudes in the radial direction at the connection portion 33. The protruding portion 35 is formed, for example, by bulging processing, and is provided continuously along the circumferential direction of the connection portion 33. The outer diameter D1 (maximum diameter) of the protruding portion 35 is larger than the inner diameter of the gas tube 40. When the gas tube 40 is inserted into the connection portion 33 so as to cover the connection portion 33, the inner surface of the gas tube 40 is pressed radially outward by the protruding portion 35. As a result, the gas tube 40 is engaged and connected to the gas release duct 32 at the connection portion 33. In this way, the gas release duct 32 and the gas tube 40 are connected without being sandwiched by a separate member such as a clamp.

[0037] As shown in FIG. 6, for example, when gas (dotted arrow in the figure) is released from the gas release valve 31a of the battery module 30A due to an abnormality in the battery cell 31, and a force (thick arrow in the figure) is applied to the upstream tube 41 in a direction away from the gas release duct 32 (leftward in this embodiment), a moment (thick arrow in the figure) that rotates counterclockwise in a top view is applied to the joint member 60. On the other hand, as described above, since the upstream tubes 41, 42 and the joint member 60 are arranged in a substantially U-shape, a force is applied to the upstream tube 42 in a direction toward the gas release duct 32 (rightward in this embodiment). At this time, the force (thick arrow in the figure) applied to the upstream tube 42 is received by the gas release duct 32 of the battery module 30B. With this configuration, the upstream tubes 41, 42 and the joint member 60 do not rotate, so that the upstream tube 41 is less likely to come off the gas release duct 32.

[0038] Therefore, even if separate parts such as clamps are not used to connect the gas release duct 32 and the gas tube 40 as in this embodiment, the gas tube 40 is less likely to come off the gas release duct 32, making it possible to reduce the number of parts and assembly labor.

[0039] As shown in FIG. 5, the exhaust part 50 has a protruding part 55 that protrudes in the radial direction at the connection part 53. The protruding part 55 is formed, for example, by bulging processing, and is provided continuously along the circumferential direction of the connection part 53. The outer diameter D2 (maximum diameter) of the protruding part 55 is larger than the inner diameter of the gas tube 40. When the gas tube 40 is inserted into the connection part 53 so as to cover the connection part 53, the inner surface of the gas tube 40 is pressed radially outward by the protruding part 55. As a result, the gas tube 40 is engaged and connected to the exhaust part 50 at the connection part 53. In this way, the exhaust part 50 and the gas tube 40 are connected without being sandwiched by a separate member such as a clamp.

[0040] In this embodiment, the outer diameter D2 of the protruding portion 55 of the exhaust portion 50 is larger than the outer diameter D1 of the protruding portion 35 of the gas release duct 32. With this configuration, the gas tube 40 is pressed radially outward by the protruding portion 55 more strongly at the exhaust portion 50 than at the gas release duct 32. Thus, the connection between the exhaust portion 50 and the gas tube 40 is stronger than the connection between the gas release duct 32 and the gas tube 40.

[0041] For example, when the internal pressure of the gas generated in the battery cell 31 becomes equal to or higher than a predetermined value due to an abnormality in the battery cell 31, the gas is usually released from the gas release valve 31a, passes through the gas release duct 32 and the gas tube 40, and is discharged from the exhaust part 50 to the outside of the interior space 2 (for example, inside the cross member). However, in the unlikely event that a blockage occurs inside the cross member or in the exhaust part 50, the gas tube 40 may become detached from the gas release duct 32 or the exhaust part 50 due to an increase in the internal pressure in the gas tube 40. If there is no difference between the strength of the connection between the exhaust part 50 and the gas tube 40 and the strength of the connection between the gas release duct 32 and the gas tube 40, specifically, if the protruding part 35 of the gas release duct 32 and the protruding part 55 of the exhaust part 50 have the same outer diameter, the gas exhaust control may not be effective, and the gas tube 40 may become detached from the exhaust part 50 due to an increase in the internal pressure in the gas tube 40.

[0042] In this embodiment, as described above, the outer diameter D2 of the protruding portion 55 of the discharge portion 50 is larger than the outer diameter D1 of the protruding portion 35 of the gas discharge duct 32, so the connection between the discharge portion 50 and the gas tube 40 is stronger than the connection between the gas discharge duct 32 and the gas tube 40. Therefore, the gas tube 40 is more likely to come off the gas discharge duct 32 than the connection with the discharge portion 50. This makes it possible to prevent the gas tube 40 from coming off the discharge portion 50 arranged outside the case 17 and causing high-temperature gas to hit an occupant in the vehicle compartment CB.

[0043] In addition, since the strength of the connection between the exhaust part 50 and the gas tube 40 and the connection between the gas release duct 32 and the gas tube 40 are made different by the protrusions 35, 55 provided on the connection parts 33, 53, it is not necessary to strengthen the connection by providing a separate member such as a clamp on the connection part 53. This makes it possible to reduce the number of parts and the number of assembly steps.

[0044] When the gas tube 40 becomes detached from the gas discharge duct 32, the gas is discharged from the gas discharge duct 32 to the inside of the case 17. The gas is diffused inside the case 17 and is discharged together with the cooling air to the outside of the battery pack 10, i.e., to the vehicle compartment CB. Since the temperature of the gas has been reduced after being diffused inside the case 17, the high-temperature gas does not hit the occupants in the vehicle compartment CB.

[0045] Although one embodiment of the present invention has 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 revised 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.

[0046] For example, in the embodiment described above, the battery pack 10 includes two battery modules 30A and 30B, but the number of battery modules 30 may be one, or three or more. Furthermore, the battery module 30 of this embodiment does not need to be modularized, and may exist in the case 17 as a cell stack in which a plurality of battery cells 31 are stacked.

[0047] In the above-described embodiment, the outer diameter D2 of the protruding portion 55 of the exhaust portion 50 is made larger than the outer diameter D1 of the protruding portion 35 of the gas discharge duct 32, thereby making the connection between the exhaust portion 50 and the gas tube 40 stronger than the connection between the gas discharge duct 32 and the gas tube 40, but this is not limited to the above. For example, the connection between the exhaust portion 50 and the gas tube 40 may be made stronger than the connection between the gas discharge duct 32 and the gas tube 40 by using a separate member such as a clamp. In addition, the connection between the exhaust portion 50 and the gas tube 40 may be made stronger than the connection between the gas discharge duct 32 and the gas tube 40 by making the inner diameter of the downstream tube 43 smaller than the inner diameters of the upstream tubes 41 and 42.

[0048] This specification describes at least the following items. In parentheses, components corresponding to the above-described embodiment are shown as examples, but the present invention is not limited to these.

[0049] (1) A case (case 17) that is placed in an interior space (interior space 2) of a vehicle (vehicle 1) and has a case body (case body 171) and a cover (cover 172) that covers the case body; At least one cell stack (battery module 30) in which a plurality of battery cells (battery cells 31) each having a gas release valve (gas release valve 31a) are stacked and housed in the case; a gas release duct (gas release duct 32) housed in the case and connecting the gas release valves of the plurality of battery cells; a gas tube (gas tube 40) connected to the gas release duct and guiding the gas released from the battery cell to the outside of the case; a discharge part (discharge part 50) provided in the interior space outside the case, connected to the gas tube, and discharging the gas flowing through the gas tube to the outside of the interior space, The connection between the exhaust part and the gas tube is stronger than the connection between the gas discharge duct and the gas tube. Battery pack.

[0050] According to (1), if the gas tube comes off from the connection point due to gas released from the battery cell due to an abnormality in the battery cell, the gas tube is more likely to come off from the gas release duct housed inside the case than when connected to the exhaust part. This prevents the gas tube from coming off from the exhaust part provided on the outside of the case, and prevents gas from being directly released into the interior space of the vehicle.

[0051] (2) A battery pack according to (1), The gas release duct and the exhaust part each have a protrusion (protrusion 35, 55) that protrudes radially at a connection part (connection part 33, 53) with the gas tube and presses the inner surface of the gas tube radially outward, The outer diameter (outer diameter D2) of the protrusion of the exhaust part is larger than the outer diameter (outer diameter D1) of the protrusion of the gas discharge duct. Battery pack.

[0052] According to (2), by making the outer diameter of the protruding portion of the gas release duct larger than that of the protruding portion of the exhaust portion, the connection between the exhaust portion and the gas tube can be strengthened. Therefore, for example, there is no need to provide a separate member such as a clamp at the connection portion with the gas tube, and the number of parts and assembly labor can be reduced.

[0053] (3) A battery pack according to (1) or (2), The at least one cell stack includes a first cell stack (battery module 30A) and a second cell stack (battery module 30B), the gas tube includes a first tube (upstream tube 41) connected to the gas discharge duct of the first cell stack, a second tube (upstream tube 42) connected to the gas discharge duct of the second cell stack, and a third tube (downstream tube 43) connected to the exhaust portion, The first tube, the second tube, and the third tube are connected to each other via a joint member (joint member 60) provided inside the case. Battery pack.

[0054] According to (3), the gas tube can be composed of multiple tubes.

[0055] (4) A battery pack according to (3), The first cell stack and the second cell stack are arranged side by side in a second direction (front-rear direction) perpendicular to a first direction (left-right direction) which is a stacking direction of the battery cells, the joint member is disposed at a position spaced apart from the first cell stack and the second cell stack in the first direction, and is disposed between the first cell stack and the second cell stack in the second direction. Battery pack.

[0056] According to (4), the joint member, the first tube connected to the gas release duct of the first cell stack, and the second tube connected to the gas release duct of the second cell stack can be arranged in a well-balanced manner.

[0057] (5) A battery pack according to (4), the joint member has a substantially T-shaped flow path, the first tube and the second tube are connected along the second direction, and the third tube is connected along the first direction; The first tube, the second tube, and the joint member are arranged to form a substantially U-shaped flow path. Battery pack.

[0058] For example, when gas is released from the gas release valve of the first cell stack and a force is applied to the first tube in a direction that causes it to come out of the gas release duct, a rotational moment is applied to the joint member due to the force. According to (5), the first tube, the second tube, and the joint member are arranged to form a substantially U-shaped flow path, so that the force applied to the second tube is received by the gas release duct of the second cell stack. Therefore, the first tube, the second tube, and the joint member do not rotate, and it is possible to make it difficult for the first tube and the second tube to come out of the gas release duct. [Explanation of symbols]

[0059] 1 vehicle 2 Indoor space 10 Battery pack 17 cases 171 Case body 172 Cover 30 Battery module (cell stack) 30A Battery Module (First Cell Stack) 30B Battery module (second cell stack) 31 Battery Cell 31a Gas release valve 32 Gas release duct 33 Connection 35 Protrusion 40 Gas Tube 41 Upstream tube (first tube) 42 Upstream tube (second tube) 43 Downstream tube (third tube) 50 Discharge section 53 Connection 55 Protrusion 60 Joint material

Claims

1. a case that is placed in an interior space of a vehicle and has a case body and a cover that covers the case body; At least one cell stack in which a plurality of battery cells each having a gas release valve are stacked and housed in the case; a gas release duct housed in the case and connecting the gas release valves of the plurality of battery cells; a gas tube connected to the gas release duct for guiding the gas released from the battery cell to the outside of the case; a discharge part provided in the interior space outside the case, connected to the gas tube, and configured to discharge the gas flowing through the gas tube to the outside of the interior space, The connection between the exhaust part and the gas tube is stronger than the connection between the gas discharge duct and the gas tube. Battery pack.

2. 2. The battery pack according to claim 1, the gas release duct and the exhaust portion each have a protruding portion that protrudes in a radial direction at a connection portion with the gas tube and presses an inner surface of the gas tube radially outward, The outer diameter of the protrusion of the exhaust portion is larger than the outer diameter of the protrusion of the gas discharge duct. Battery pack.

3. 3. The battery pack according to claim 1, the at least one cell stack includes a first cell stack and a second cell stack; the gas tube includes a first tube connected to the gas discharge duct of the first cell stack, a second tube connected to the gas discharge duct of the second cell stack, and a third tube connected to the exhaust portion; the first tube, the second tube, and the third tube are connected to each other via a joint member provided inside the case. Battery pack.

4. 4. The battery pack according to claim 3, The first cell stack and the second cell stack are arranged side by side in a second direction perpendicular to a first direction which is a stacking direction of the battery cells, the joint member is disposed at a position spaced apart from the first cell stack and the second cell stack in the first direction, and is disposed between the first cell stack and the second cell stack in the second direction. Battery pack.

5. 5. The battery pack according to claim 4, the joint member has a substantially T-shaped flow path, the first tube and the second tube are connected along the second direction, and the third tube is connected along the first direction, The first tube, the second tube, and the joint member are arranged to form a substantially U-shaped flow path. Battery pack.

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