JP2020145067A - Cooling device for battery module - Google Patents

Abstract

To provide a cooling device for a battery module easy to assemble with excellent cooling performance and temperature uniformity.SOLUTION: The cooling device for cooling a battery module using a coolant and cooling liquid includes a cooling liquid tank and a cover of the cooling liquid tank and is configured so that the cooling liquid flows in the cooling liquid tank. A coolant passage for flowing the coolant is formed integrally with the cover.SELECTED DRAWING: Figure 1

Description

The present invention relates to a cooling device for a battery module.

In Patent Document 1, a power supply device for a vehicle has a battery block formed by connecting a plurality of battery cells, a cooling plate that is thermally coupled to the battery cells and cools the battery cells with a supplied refrigerant, and a cooling plate. It is equipped with a cooling mechanism that supplies coolant to the cooling mechanism and a control circuit that controls the cooling mechanism to control the cooling state of the cooling plate. The cooling plate is provided with a hollow portion having a watertight structure inside, and the cooling plate is provided in this hollow portion. The cooling plate is filled with a cooling liquid that equalizes the temperature of the cooling plate, and a heat exchanger that cools the cooling liquid with the heat of vaporization of the refrigerant is arranged, and the power supply device circulates the cooling liquid in the heat exchanger of the cooling plate. It is described that the heat of vaporization cools the heat exchanger, the heat exchanger cools the coolant, and the cooling plate cools the battery cell.

JP-A-2010-50000

By the way, a cooling device for cooling a battery module including a battery cell is suitable if it is easy to assemble. For example, as a general mass production method for heat exchangers, there is an in-core brazing method using a continuous furnace. However, the size required for a cooling device for cooling a battery module mounted on a vehicle is larger than that for a cooling device for cooling a drive motor or an electric device or for air conditioning. Therefore, a structure that requires brazing in a continuous furnace requires a large investment in production equipment.

In addition, the cooling device is also required to have conditions such as cooling performance and temperature uniformity.

An object of the present invention is to provide a cooling device that can be easily assembled and has excellent cooling performance and temperature uniformity.

A cooling device for a battery module that cools the battery module using a refrigerant and a coolant,
A coolant tank and a lid of the coolant tank are provided so that the coolant flows through the coolant tank, and a refrigerant flow path for flowing the refrigerant is integrally formed with the lid. .. With the above configuration, the lid having the refrigerant flow path integrally formed is simply attached to the coolant tank to form a cooling device, so that the assembly can be easily performed. Further, since both the refrigerant and the coolant are used, the battery module can be cooled evenly, and excellent cooling performance and temperature uniformity can be provided.

According to the present invention, it is possible to provide a cooling device that can be easily assembled and has excellent cooling performance and temperature uniformity.

Side view of the cooling device 100 according to the embodiment of the present disclosure. It is a perspective view which shows the example of attaching the lid 1 to a coolant tank 2, and is the figure when (a) screw is used, (b) caulking is used. It is a figure which shows an example of the method of integrally forming a lid 1 and a refrigerant flow path 14, (a) perspective view, (b) (a) enlarged perspective view of the area shown by the circle. The figure which shows the modification of the integrally formed lid 1. It is a figure which showed the method of fixing the lid 1 by using the rib provided in the coolant tank 2, (a) the perspective view which shows before fixing the lid 1, (b) after fixing a lid 1. Side view shown It is a figure which showed the method of fixing the lid 1 by using the rib provided in the coolant tank 2, (a) the perspective view which shows before fixing the lid 1, (b) after fixing a lid 1. Side view showing the first example, (c) Side view showing the second example after fixing the lid 1. It is a figure which shows the arrangement example of the refrigerant flow path 14, (a) perspective view of arrangement example 1, (b) top view of arrangement example 2, (c) top view of arrangement example 3, (d) arrangement example 4. Top view A side view showing a configuration example of a battery pack 200 incorporating the cooling device 100 according to the embodiment of the present disclosure. It is a figure which shows the injection mechanism of the coolant, (a) the side view which shows the arrangement example of a gangway 16, (b) the side view which shows the flow of a coolant in a normal operation, (c) the flow of a coolant in an emergency. Side view showing A side view showing a modified example of the cooling device according to the embodiment of the present disclosure.

Hereinafter, on the premise that an example of the refrigerant is CFC substitutes and an example of the coolant is water, the details will be described with reference to the drawings as appropriate. It should be noted that the accompanying drawings and the following description are provided for those skilled in the art to fully understand the present disclosure, and are not intended to limit the subject matter described in the claims.

FIG. 1 is a side view of the cooling device 100 according to the embodiment of the present disclosure. The cooling device 100 includes a lid 1 and a coolant tank 2. The lid 1 has a first surface 11 and a second surface 12, and in this figure, the first surface 11 is the upper surface and the second surface 12 is the lower surface.

A refrigerant pipe 13 is provided on the first surface 11 of the lid 1. The refrigerant pipe 13 communicates with the refrigerant flow path 14 integrally formed with the lid 1, as will be described later based on FIG. Through the refrigerant pipe 13, the refrigerant flows into the cooling device 100, and the refrigerant flows out from the cooling device 100. Two refrigerant pipes 13 may extend from the first surface 11 of the lid 1 (see FIG. 3A).

As the refrigerant flowing in the refrigerant pipe 13, there is a so-called CFC substitute. For example, HFC (R134a), HFO (R1234yf) that further considers the prevention of global warming, and the like. However, the refrigerant is not limited to these.

The coolant tank 2 is arranged under the lid 1, and the coolant flows through the lid 1. An example of a coolant is water. However, it is not limited to water.

The coolant tank 2 has a bottom portion 21. The coolant tank 2 may have ribs 22 extending upward from the bottom 21. The number of ribs 22 is not limited to one. The rib 22 is provided for the purpose of dividing the path of the coolant flowing in the coolant tank 2 and controlling the direction of the coolant flowing.

In the present embodiment, the coolant pipe 23 is provided on the side surface of the coolant tank 2. Through the coolant pipe 23, the coolant flows into the cooling device 100, and the coolant flows out from the cooling device 100. The coolant pipe 23 depicted in FIG. 1 may have two pipes, an inflow pipe and an outflow pipe (see FIGS. 9 (b) and 9 (c)).

In this embodiment, the battery module is placed on the upper surface of the cooling device 100, that is, on the first surface 11 of the lid 1. That is, the battery module is cooled by the refrigerant and the coolant flowing in the cooling device 100. This makes it possible to prevent thermal runaway of the battery module.

FIG. 2 is a perspective view showing an example of attaching the lid 1 to the coolant tank 2, and is a case where (a) screws are used and (b) caulking is used. In FIG. 2, some members such as the refrigerant pipe 13 and the coolant pipe 23 are not shown. In order to facilitate understanding, some members may be omitted from the subsequent drawings 3 and later.

As shown in FIG. 2A, the lid 1 is put on the coolant tank 2 and fixed with screws 50. Instead of the screw 50, it may be fixed with a rivet (not shown). As will be described later based on FIG. 5 and the like, the portion fixed with the screw 50 may be sealed with an O-ring 58 or a gasket (not shown). This sealing prevents the coolant inside the coolant tank 2 from leaking out.

Further, as shown in FIG. 2B, the lid 1 may be put on the coolant tank 2 and fixed by caulking 55. An O-ring 58 (see FIG. 6) or a gasket (not shown) may be used to seal the coolant so that the coolant inside the coolant tank 2 does not leak.

FIG. 3 is a diagram showing an example of a method of integrally forming the lid 1 and the refrigerant flow path 14, and is an enlarged perspective view of a region shown by a circle in (a) and (b) and (a). is there.

As shown in FIG. 3A, the lid 1 has a hole 15. The hole 15 penetrates from the first surface 11 to the second surface 12 of the lid 1. The refrigerant pipe 13 and the refrigerant flow path 14 are connected with the lid 1 sandwiched so as to block the hole 15. The refrigerant pipe 13 sandwiches the lid 1 from the first surface 11 side of the lid 1, and the refrigerant flow path 14 sandwiches the lid 1 from the second surface 12 side of the lid 1. Then, in this embodiment, when the lid 1 is attached to the coolant tank 2 (see FIG. 2), the refrigerant flow path 14 is arranged in the coolant tank 2.

In the example of FIG. 3A, there are two refrigerant pipes 13 extending from the first surface 11 of the lid 1. The inflow refrigerant pipe 13a for flowing the refrigerant into the cooling device 100 and the outflow refrigerant pipe 13b for flowing out the refrigerant from the cooling device 100, respectively. Here, the direction in which the refrigerant flows is indicated by the black arrow in the figure. On the other hand, the flow of the coolant (described later based on FIGS. 5 and 6 and the like) is indicated by a white arrow in the figure.

With reference to FIGS. 2 and 3, the refrigerant flows into the cooling device 100 through the inflow refrigerant pipe 13a. This refrigerant flows in the refrigerant flow path 14. Then, this refrigerant flows out of the cooling device 100 through the outflow refrigerant pipe 13b.

For example, the lid 1 and the refrigerant flow path 14 are integrally formed by the above configuration.

As shown in the enlarged view shown in FIG. 3B, the connection between the refrigerant pipe 13 sandwiching the lid 1 and the refrigerant flow path 14 is made watertight. Hereinafter, an example of watertight connection will be described with reference to FIG. 3 (b).

The refrigerant pipe 13 includes a pipe body 131 and a flange 132 provided at the tip of the pipe body 131. The flange 132 is in contact with the first surface 11 of the lid 1. At the time of this contact, the watertight packing 133 is sandwiched between the flange 132 and the first surface 11 of the lid 1. The packing 133 keeps the joint watertight.

Next, a structural example of the lid 1 on the second surface 12 side will be described. The refrigerant flow path 14 includes a flow path main body 141 and a flange 142 provided at the tip of the flow path main body 141. The flange 142 has a contact portion 1421, and the contact portion 1421 is brought into contact with the second surface 12 of the lid 1.

The flange 142 includes a protrusion 1422. The protruding portion 1422 can be inserted into a recess (not shown) in the flange 132 included in the refrigerant pipe 13. That is, the outer diameter of the protruding portion 1422 is smaller than the inner diameter of the flange 132.

When the contact portion 1421 of the flange 142 is brought into contact with the second surface 12 of the lid 1, the protruding portion 1422 penetrates the hole 15 and is inserted into the recess of the flange 132. Here, from the viewpoint of watertightness, the O-ring 143 for piping is inserted between the lid 1 and the protruding portion 1422 of the flange 142. The O-ring 143 keeps the joint watertight.

Each member may be fixed by using screws 144 or the like as shown in addition to connecting the flanges 132 and 142 to each other. The refrigerant pipe 13 and the refrigerant flow path 14 may be connected by a configuration other than the one shown in the figure so that the refrigerant does not leak.

For example, with the above configuration, the lid 1 and the refrigerant flow path 14 are integrally formed. Then, the lid 1 after the integral formation can be put on the coolant tank 2 and assembled as shown in FIG. This assembly is simple, and the cooling device 100 can be easily manufactured. Furthermore, it is not necessary to perform brazing, which has been conventionally performed, for assembly. Brazing using a large furnace is no longer necessary, and a large amount of investment in production equipment is not required.

Further, in the above configuration, the refrigerant pipe 13 extends from the first surface 11 of the lid 1 to the outside of the cooling device 100. That is, the refrigerant pipe does not penetrate the side surface of the cooling device 100. As a result, the watertightness of the cooling device 100 can be easily ensured.

FIG. 4 is a diagram showing a modified example of the integrally formed lid 1. FIG. 4A is the same as FIG. 3A, and a tubular pipe is used as the refrigerant flow path 14.

In the modified example shown in FIG. 4B, a pipe bent in a U shape is used as the refrigerant flow path 14. Further, one or more heat radiation fins 145 are added to the outside of the refrigerant flow path 14. After assembly, the refrigerant flow path 14 is arranged in the coolant tank 2 together with the heat radiation fins 145 (see FIGS. 2 and 7), and exchanges heat with the coolant flowing in the coolant tank 2. The presence of the heat radiating fins 145 increases the cross-sectional area in contact with the coolant, and enables more efficient heat exchange.

FIG. 4C is a modified example using the roll bond method. A portion other than the portion serving as the refrigerant flow path is crimped between the plates constituting the lid 1. Next, high-pressure air is blown between the plates to inflate the refrigerant flow path 14. Even with such a configuration, since the refrigerant flow path 14 is integrally formed with the lid 1, watertightness can be ensured.

FIG. 5 is a view showing a method of fixing the lid 1 by using the ribs provided in the coolant tank 2. FIG. 5A is a perspective view showing before fixing the lid 1, and FIG. 5B shows the lid 1. It is a side view which shows after fixing.

As shown in FIG. 5A, the coolant tank 2 may be provided with ribs 221 and 222 for controlling the flow of the coolant. The number and position of ribs 221 and 222 are not limited. The ribs 221 and 222 are partitions in the coolant tank 2, and by providing the partitions, the direction in which the coolant flows in the coolant tank 2 can be defined (see the white arrows in the figure). ..

FIG. 5B is a cross-sectional view taken along the line AA'of FIG. 5A. As shown in FIG. 5B, the lid 1 and the coolant tank 2 are fixed by screws 50. In addition, you may fix using a rivet or the like instead of a screw 50. An O-ring 58 is arranged around the screw 50 as a watertight member and sealed so that the coolant does not leak. The watertight member is not limited to the O-ring, but may be a gasket or the like.

Here, in the present embodiment, the battery module is placed on the first surface 11 of the lid 1 provided in the cooling device 100. The lid 1 of the cooling device 100 must withstand the load of this battery module. That is, the withstand voltage strength of the cooling device 100 is a matter to be examined.

In the present disclosure, the ribs provided in the coolant tank 2 for controlling the flow of the coolant can also be used as a reinforcing member arranged in the cooling device 100. For example, in the example of FIG. 5B, the ribs 221 and 222 extending upward from the bottom 21 of the coolant tank 2 serve as pillars and support the central portion of the lid 1 of the cooling device 100 from below. With such a configuration, the withstand voltage strength of the cooling device 100 is increased. It is not necessary that all the ribs support the lid 1. For example, the rib 221 may be configured to support the lid 1, but the rib 222 may not support the lid 1.

FIG. 6 is a view showing a method of fixing the lid 1 by using the ribs provided in the coolant tank 2, as in FIG. 5, and (a) a perspective view showing before fixing the lid 1. b) A side view showing a first example after fixing the lid 1, and (c) a side view showing a second example after fixing the lid 1. In the example of FIG. 6, the fixing between the lid 1 and the coolant tank 2 is performed by caulking.

Similar to FIG. 5A, in the example shown in FIG. 6A, the coolant tank 2 may be provided with ribs 221 and 222 for controlling the flow of the coolant. The number and position of ribs 221 and 222 are not limited. The ribs 221 and 222 are partitions in the coolant tank 2, and by providing the partitions, the direction in which the coolant flows in the coolant tank 2 can be defined (see the white arrows in the figure). ..

In the example shown in FIG. 6B, which is a cross-sectional view taken along the line AA'of FIG. 6A, the outer frame portion of the lid 1 is fixed by the caulking 55. As shown, the ribs 221 and 222 support the lid 1 from below. The pressure resistance strength of the cooling device 100 is increased by the support from the lower side by the ribs.

The rib 222 may include a groove 222A. By engaging the claw 56 extending from the second surface 12 of the lid 1 with the groove portion 222A, it is possible to prevent the lid 1 from floating with respect to the coolant tank 2.

Further, a support reinforcing member 59 may be provided on the upper portion of the rib 221. If there is a space between the upper portion of the rib 221 and the second surface 12 of the lid 1, the central portion of the unsupported lid 1 may be dented by the weight of the battery module. However, since the support / reinforcing member 59 further supports the lid 1 from below, it is possible to prevent the lid 1 from being dented, and the pressure resistance strength of the cooling device 100 is increased.

As shown in FIG. 6 (c), a caulking 55 may also be provided on the rib 221 and the lid 1 can be fixed to the coolant tank 2 by the caulking 55. With the above configuration, the lid 1 can be firmly fixed by the coolant tank 2.

Although not shown, it is also possible to further provide a mechanism for preventing mutual lateral displacement between the lid 1 and the coolant tank 2. With this lateral slip prevention mechanism, for example, lateral displacement in the x-axis and y-axis directions in the xyz axis shown in FIGS. 6 (b) and 6 (c) can be prevented.

FIG. 7 is a diagram showing an arrangement example of the refrigerant flow path 14, in which (a) a perspective view of arrangement example 1, (b) a top view of arrangement example 2, (c) a top view of arrangement example 3, and (d). It is a top view of the arrangement example 4.

As shown in FIGS. 7 (a) to 7 (d), ribs 221 and 222 are provided inside the coolant tank 2. As described above, the purpose of these ribs is to define the direction in which the coolant flows in the coolant tank 2. Here, the refrigerant flow path 14 may be further arranged in the coolant tank 2. As shown in FIGS. 3 and 4, the refrigerant flow path 14 is integrally formed with the lid 1.

The refrigerant flow path 14 is arranged so as to avoid ribs 221 and 222. Therefore, the refrigerant flow path 14 does not collide with the ribs 221 and 222 even when the lid 1 is attached to the coolant tank 2, and appropriately exchanges heat with the coolant flowing in the coolant tank 2. Can be done. Then, the battery module can be cooled evenly by the refrigerant and the cooling liquid.

The refrigerant flow path 14 can be freely arranged while avoiding ribs. For example, in Arrangement Example 1 and Arrangement Example 2 shown in FIGS. 7 (a) and 7 (b), the inflowing refrigerant covers one side region (for example, the right side of FIG. 7 (b)) centrally divided by the rib 221. After making one round trip, it flows into the other one-sided area. In the arrangement example 3 shown in FIG. 7 (c), the inflowing refrigerant branches into two streams, each of which makes one round trip in the one-sided region and then flows out to the outside. As in the arrangement example 4 shown in FIG. 7D, the inflowing refrigerant may make one or more round trips in one side region and then flow into the other one side region. These examples of arrangement of the refrigerant flow path 14 are examples, and the arrangement of the refrigerant flow path 14 may be appropriately changed according to the number, positions, and the like of ribs provided in the coolant tank 2.

Here, referring to FIGS. 1 and 7 together, the cooling device 100 provided with the lid 1 and the coolant tank 2 configured as described above has a battery on the first surface 11 (upper surface) of the lid 1. Modules can be placed. Then, the battery module can be cooled by the refrigerant flowing in the refrigerant flow path 14 and the cooling liquid flowing in the coolant tank 2.

FIG. 8 is a side view showing a configuration example of the battery pack 200 incorporating the cooling device 100 according to the embodiment of the present disclosure. The battery pack 200 is provided so that the upper case 201 and the lower case 202 are overlapped with each other. Then, the battery module 300 is arranged in the battery pack 200.

Here, the battery pack 200 and the cooling device 100 of the present disclosure can be integrated as shown in FIG. That is, the coolant tank 2 of the cooling device 100 is provided in the lower case 202 of the battery pack 200, and the coolant flows inside the case 202. In the example of FIG. 8, the lower case 202 itself is used as the coolant tank 2 of the cooling device 100, but it is not intended to exclude that the lower case 202 and the coolant tank 2 are separate members.

At this time, the refrigerant flow path 14 of the cooling device 100 is arranged inside the lower case 202, and heat exchanges between the coolant flowing in the lower case 202 and the refrigerant flowing in the refrigerant flow path 14. Is done. In FIG. 8, the refrigerant flow path 14 includes heat radiation fins 145 (see FIG. 4B).

The lid 1 of the cooling device 100 is placed on the edge provided in the lower case 202 (corresponding to the coolant tank 2) of the battery pack 200, and is appropriately fixed. Further, as described above, the lid 1 and the refrigerant flow path 14 are integrally formed.

In this way, the battery module 300 is placed on the lid 1 of the cooling device 100 integrally incorporated in the battery pack 200. The upper case 201 is placed over the battery module 300 to form the battery pack 200. Then, the battery module 300 is cooled by the built-in cooling device 100.

For example, with the above configuration, the cooling device 100 according to the embodiment of the present disclosure can be easily incorporated into the battery pack 200.

9A and 9B are views showing the cooling liquid injection mechanism, which are (a) a side view showing an arrangement example of the gangway 16, (b) a side view showing the flow of the cooling liquid in a normal state, and (c) an emergency. It is a side view which shows the flow of the coolant. The white arrows in FIG. 9 indicate the direction in which the coolant flows.

As shown in FIG. 9A, the lid 1 is provided with a gangway 16. The gangway 16 penetrates from the second surface 12 of the lid 1 to the first surface 11. On the other hand, as shown in FIGS. 9 (b) and 9 (c), the cooling device 100 has an emergency valve 18 at a position blocking the gangway 16.

Here, as shown in FIG. 1, the coolant tank 2 is provided with a coolant pipe 23 on its side surface. As shown in FIGS. 9B and 9C, there may be two coolant pipes 23. That is, the inflow coolant pipe 23a that allows the coolant to flow into the cooling device 100, and the outflow coolant pipe 23b that causes the coolant to flow out of the cooling device 100.

The coolant flows into the coolant tank 2 through the inflow coolant pipe 23a. As shown in FIG. 5A, for example, the coolant circulates in the coolant tank 2 along a flow defined by ribs 221 and 222 and the like. Then, the coolant flows out of the cooling device 100 through the outflow coolant pipe 23b. Here, the inflow of the cooling liquid into the coolant tank 2 and the outflow of the cooling liquid from the coolant tank 2 may be performed by applying pressure by the pump 60.

As shown in FIG. 9B, since the valve 18 is closed in the normal state, the coolant passing through the inflow coolant pipe 23a does not flow into the upper part of the lid 1 and is inside the coolant tank 2. Flow into.

On the other hand, in an emergency such as when the battery module 300 causes thermal runaway, the valve 18 is opened as shown in FIG. 9C. When the valve 18 is opened, the coolant passing through the inflow coolant pipe 23a flows into the upper part of the lid 1 through the gangway 16. Here, by reducing the diameter of the gangway 16, the coolant can be sprayed onto the upper part of the lid 1. By the injection of this coolant, the battery module 300 that has caused thermal runaway is rapidly cooled, and the crisis of thermal runaway is avoided.

FIG. 10 is a side view showing a modified example of the cooling device according to the embodiment of the present disclosure. The cooling device 101 shown in this figure has a structure in which a plate through which a refrigerant flows and a plate through which a coolant flows are laminated. For example, as shown in the figure, the refrigerant is introduced from the refrigerant pipe 13 to the upper plate 71, and the coolant is introduced from the coolant pipe 23 to the lower plate 72. The lid 1 is put on the lower plate 72 and the upper plate 71, and the plates are joined to each other by the in-core brazing method. Then, each pipe can be joined by brazing, and the watertightness is improved.

As described above, in the cooling device, the fixing between the coolant tank and the lid may be performed by the fixing member. Examples of the fixing member are screws, rivets, caulking and the like.

For example, in the manufacture of in-vehicle battery packs, large equipment is required for joining by the brazing method. However, with the above configuration, joining with screws, rivets, caulking, etc. is sufficient. The cooling device can be easily assembled.

In the above configuration, the coolant tank may include one or more ribs that control the flow of coolant, and at least one of the one or more ribs may support the lid.

With the above configuration, the ribs originally provided for the purpose of controlling the flow direction of the coolant support the lid, so that the pressure resistance strength of the cooling device is increased.

In the above configuration, a watertight member may be arranged around the rib that supports the lid. With this configuration, leakage of the coolant can be prevented.

In the above configuration, at least one of the ribs may be provided with a groove, the lid may be provided with a claw on a surface facing the water tank, and the claw may be engaged with the groove. With this configuration, the lid does not rise with respect to the coolant tank.

In the above configuration, at least one of the ribs may include a support reinforcing member, which may support the lid. With this configuration, the support reinforcing member can support the lid even if there is a space between the upper surface of the rib and the lower surface of the lid. As a result, the dent of the lid can be prevented, and the pressure resistance strength of the cooling device is increased.

In the above configuration, the refrigerant flow path may be arranged at a position that avoids contact with the rib when the lid is attached to the coolant tank. With this configuration, when the lid and the coolant tank are combined, the refrigerant flow path and the rib do not collide with each other, and the cooling device can be safely assembled.

Also, the battery pack may include at least one battery module and the cooling device described above. Further, the coolant tank of the cooling device and the case of the battery pack may be integrated.

With the above configuration, the battery module in the battery pack can be cooled by the above-mentioned cooling device. Further, if the coolant tank and the case of the battery pack are integrated, the number of members is reduced and a thinner battery pack can be provided.

In the above configuration, the lid of the cooling device is provided with a gangway, the cooling device is provided with a valve, the valve is a first state in which the cooling liquid flows in the coolant tank, and the cooling liquid penetrates the cooling liquid. It may be configured to switch between a second state of cooling the battery module through the path.

With the above configuration, when the battery module included in the battery pack runs away due to thermal runaway, the battery module can be directly cooled by injecting a coolant or the like. As a result, the crisis of thermal runaway can be avoided.

Although various embodiments have been described above with reference to the drawings, it goes without saying that the present invention is not limited to such examples. It is clear that a person skilled in the art can come up with various modifications or modifications within the scope of the claims, which naturally belong to the technical scope of the present invention. Understood. In addition, each component in the above embodiment may be arbitrarily combined as long as the gist of the invention is not deviated.

100 Cooling device 200 Battery pack 201 Upper case 202 Lower case 300 Battery module 11 First side 12 Second side 13 Refrigerator pipe 13a Inflow refrigerant pipe 13b Outflow refrigerant pipe 131 Pipe body 132 Flange 133 Packing 14 Refrigerator flow path 141 Flow path body 142 Flange 1421 Abutment part 142 Protruding part 143 O-ring 144 Screw 145 Radiation fin 15 Hole 16 Through passage 18 Valve 2 Coolant tank 21 Bottom 22 Rib 221 Rib 222 Rib 23 Coolant pipe 23a Inflow coolant pipe 23b Outflow coolant pipe 50 Screw 55 Caulking 58 O-ring 59 Support reinforcement 60 Pump

Claims (11)

A cooling device for battery modules
The cooling device cools the battery module by using a refrigerant and a coolant.
The cooling device includes a coolant tank and a lid of the coolant tank.
It is configured so that the coolant flows through the coolant tank.
The refrigerant flow path for flowing the refrigerant is integrally formed with the lid.
Cooling system. The cooling device according to claim 1.
The fixing between the coolant tank and the lid is performed by the fixing member.
Cooling system. The cooling device according to claim 2.
The fixing member is at least one of screws, rivets, and caulking.
Cooling system. The cooling device according to any one of claims 1 to 3.
The coolant tank comprises one or more ribs that control the flow of coolant.
At least one of the one or more ribs supports the lid.
Cooling system. The cooling device according to claim 4.
A watertight member is arranged around the rib that supports the lid.
Cooling system. The cooling device according to claim 4 or 5.
At least one of the ribs has a groove
The lid has a claw on the surface facing the coolant tank.
The engagement between the claw and the groove prevents the lid from rising with respect to the coolant tank.
Cooling system. The cooling device according to any one of claims 4 to 6.
At least one of the ribs has a support reinforcing member
The support reinforcing member supports the lid.
Cooling system. The cooling device according to any one of claims 4 to 7.
The refrigerant flow path is arranged at a position that avoids contact with the rib when the lid is attached to the coolant tank.
Cooling system. It ’s a battery pack,
The cooling device according to any one of claims 1 to 8 is provided with at least one battery module.
Battery pack. The battery pack according to claim 9.
The coolant tank of the cooling device and the case of the battery pack are integrated.
Battery pack. The battery pack according to claim 9 or 10.
The lid of the cooling device comprises a gangway
The cooling device is equipped with a valve
The valve switches between a first state in which the coolant flows through the coolant tank and a second state in which the coolant cools the battery module through the gangway.
Battery pack.

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