Battery pack

Abstract

To provide a battery pack capable of ensuring cooling performance.SOLUTION: A battery pack 1 includes a cooling structure having a first cooling passage 11 for flowing a coolant 20 into a space between stacked battery cells 10 and a second cooling passage 12 for flowing the coolant 20 out from the space between the battery cells. The battery pack 1 is configured such that refrigerant 20 flows into both the first cooling channel 11 and the second cooling channel 12 at one end of the stacked battery cells 10, and flows out of the second cooling channel 12 at the other end of the stacked battery cells 10.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a battery pack. [Background technology]

[0002] Patent Document 1 discloses a battery pack to be mounted on an electric vehicle. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2011-520235 Summary of the Invention [Problem to be solved by the invention]

[0004] In battery packs where multiple battery cells are stacked and electrically connected, the exhaust side is often open to prevent a decrease in the amount of refrigerant flowing in due to high pressure on the exhaust side, which would result in a deterioration in cooling performance.

[0005] On the other hand, in cases where the battery pack needs to be sealed, such as for improved waterproofing, cooling performance may be impaired because an open structure cannot be provided.

[0006] One way to deal with the deterioration of cooling performance is to increase the flow rate of the refrigerant being introduced, but increasing the flow rate can cause problems, such as an increase in the operating noise of the device that pumps the refrigerant, such as a cooling fan, and a reduction in the interior space of the vehicle due to the increased equipment.

[0007] The present disclosure has been made to solve such problems, and has an object to provide a battery pack that can ensure cooling performance. [Means for solving the problem]

[0008] The battery pack according to the present disclosure includes a cooling structure having a first cooling flow path that allows a refrigerant to flow between stacked battery cells and a second cooling flow path that allows the refrigerant to flow out from between the battery cells, and is configured so that the refrigerant flows into the first cooling flow path and the second cooling flow path at one end of the stacked battery cells and flows out from the second cooling flow path at the other end of the stacked battery cells. This makes it possible to provide a battery pack that can ensure cooling performance. [Effects of the Invention]

[0009] The present disclosure makes it possible to provide a battery pack that can ensure cooling performance. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a structural diagram of a battery pack according to the present disclosure. [Figure 2] FIG. 1 is a structural diagram of a related battery pack. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings. Fig. 1 is a structural diagram of a battery pack 1 according to the present disclosure. The battery pack 1 includes stacked battery cells 10 and a cooling structure having a first cooling channel 11 and a second cooling channel 12.

[0012] The first cooling flow path 11 and the second cooling flow path 12 each have a sealed structure, but are partially provided with openings 13 and 14 through which the coolant 20 flows in. In addition, the second cooling flow path 12 has an opening 15 at its end that functions as an exhaust port.

[0013] The first cooling flow paths 11 are configured to allow the coolant 20 to flow between the stacked battery cells 10. The second cooling flow paths 12 are configured to allow the coolant 20 to flow out from between the battery cells 10.

[0014] The battery pack 1 is configured so that the refrigerant 20 flows into the first cooling flow path 11 and the second cooling flow path 12 at one end 21 of the stacked battery cells 10, and flows out of the second cooling flow path 12 at the other end 22 of the stacked battery cells 10.

[0015] With this configuration, it is possible to provide a battery pack that can ensure cooling performance.

[0016] As a comparative example, FIG. 2 shows an example of the configuration of a battery pack 2 equipped with a cooling structure having a single cooling flow path 110 through which the coolant 20 flows.

[0017] In order to ensure the cooling performance of the battery pack 2, it is necessary to increase the flow rate of the refrigerant 20. At this time, since the single cooling channel 110 has a sealed structure, there are areas where the pressure of the refrigerant 20 becomes high, for example, near the opening 130, making it difficult for the refrigerant 20 to enter. Furthermore, it is necessary to enlarge the opening 130 to ensure the flow rate of the refrigerant, which causes problems such as an increase in the size of the cooling structure.

[0018] In the structure of the battery pack 1 according to the present disclosure, by providing a second cooling flow path 12, which is a sealed intake path, in the area where the pressure was high in the comparative example, it is possible to ensure sealing while suppressing the increase in pressure on the exhaust side.

[0019] In this way, a battery pack that can ensure cooling performance can be provided.

[0020] The present disclosure is not limited to the above-described embodiment, and can be modified as appropriate within the scope of the present disclosure. [Explanation of symbols]

[0021] 1, 2 Battery pack 10 battery cells 11 First cooling channel 12 Second cooling channel 13, 14, 15, 130 openings 20 Refrigerant 21 one end 22 other end 110 Cooling channel

Claims

[Claim 1] a first cooling flow path through which a coolant flows between the stacked battery cells; a cooling structure having a second cooling flow path that allows the coolant to flow out from between the battery cells, the refrigerant flows into the first cooling flow path and the second cooling flow path at one end of the stacked battery cells, and flows out of the second cooling flow path at the other end of the stacked battery cells. Battery pack.

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