Battery pack and battery pack cooling system comprising the same

Abstract

Disclosed is a battery pack and a battery pack cooling system including the same. The battery pack according to the present disclosure includes a battery pack case for supplying refrigerant liquid for immersion cooling to the battery pack case, a battery module accommodated in the battery pack case, and an electrical unit accommodated in the battery pack case and disposed separately from the battery module, the battery pack case including a battery module case for accommodating the battery module and an electrical unit case for accommodating the electrical unit, the refrigerant liquid flowing in the battery module case and the electrical unit case.

Description

Technical Field

[0001] This disclosure relates to a battery pack and a battery pack cooling system including the battery pack. Background Technology

[0002] In recent years, with the increasing demand for fast charging of batteries for electric vehicles, immersion cooling methods are being developed to replace traditional indirect cooling methods.

[0003] Generally, immersion-cooled battery systems include a reservoir structure to maintain the immersion water level, filter foreign matter, and prevent the formation of air bubbles inside the fluid.

[0004] On the other hand, given the limited vehicle space and weight, it is necessary to minimize the immersion cooling battery system.

[0005] Furthermore, when the battery system is charged rapidly, the electrical components that make up the submerged cooling battery system will be subjected to overload, so a system that can effectively cool the battery and electrical components is needed. Utility Model Content

[0006] (a) Technical problems to be solved

[0007] According to one aspect of this disclosure, a battery pack for improving space efficiency for immersion cooling and a battery pack cooling system including the battery pack can be provided.

[0008] (II) Technical Solution

[0009] A battery pack according to an embodiment of the present disclosure may include: a battery pack housing to which a refrigerant liquid for immersion cooling is supplied; a battery module housed in the battery pack housing; and an electrical unit housed in the battery pack housing and disposed separately from the battery module. The battery pack housing includes: a battery module housing for housing the battery module; and an electrical unit housing for housing the electrical unit, wherein the refrigerant liquid flows in the battery module housing and the electrical unit housing.

[0010] The battery pack may further include: a built-in pump housed in a pump housing that forms the housing of the battery pack; and a first valve that regulates the flow of the refrigerant liquid between the built-in pump and the battery module housing.

[0011] The battery pack may further include: a circulation channel connected to the battery pack housing, in which the refrigerant liquid flows, the circulation channel including: a circulation supply channel connected to the electrical unit housing; and a circulation discharge channel connected to the battery module housing.

[0012] The refrigerant liquid can flow sequentially from the circulation supply channel through the electrical unit housing, the battery module housing, and the circulation discharge channel.

[0013] The electrical unit housing may be located in front of the battery module housing.

[0014] The battery pack may further include: a battery pack cooling channel disposed within the battery pack housing, the battery pack cooling channel including: a first battery pack cooling channel connecting the electrical unit and the built-in pump; and a second battery pack cooling channel connecting the built-in pump and the battery module housing.

[0015] The first valve can be installed in the cooling channel of the second battery pack.

[0016] The battery pack may include: a door that is openably and closably attached to the upper part of an opening in the battery pack housing, the door comprising: a module housing main body door disposed above the opening in the battery module housing; and an electrical unit housing main body door disposed above the opening in the electrical unit housing.

[0017] The electrical unit may include: an electrical unit housing connected to the circulation supply channel, to which refrigerant is supplied; a power relay assembly housed within the electrical unit housing; and a battery management system disposed adjacent to the power relay assembly.

[0018] The battery management system may be disposed in the power relay assembly (PRA) recess formed in the power relay assembly.

[0019] The electrical unit housing may include: a lower housing having a refrigerant liquid outlet that forms a hollow shape and is connected to the cooling channel of the first battery pack; and an upper housing that is attached to the upper part of the opening of the lower housing and has a refrigerant liquid inlet connected to the circulation supply channel.

[0020] The electrical unit may include a bracket disposed in the recess of the power relay assembly (PRA), and the battery management system is supported by the bracket.

[0021] The battery module may include: a battery module housing; and battery cells, which are housed in the battery module housing and are stacked in a front-to-back direction.

[0022] The battery module housing and the electrical unit housing can be arranged adjacent to each other.

[0023] The electrical unit and the battery module can be connected via a busbar embedded in the lower part of the battery pack housing.

[0024] A battery pack cooling system according to an embodiment of the present disclosure may include: a battery pack, which separately houses battery modules and electrical units electrically connected to the battery modules, and a refrigerant liquid for immersion cooling is supplied to the battery pack; a circulation channel connected to the battery pack; a cooler disposed in the circulation channel and used to cool the refrigerant liquid; and a reservoir disposed in the circulation channel and storing the refrigerant liquid discharged from the battery pack.

[0025] The circulation channel may include: a circulation supply channel connected to the electrical unit; and a circulation discharge channel connected to the battery module housing that houses the battery module.

[0026] The circulation channel may further include a second valve disposed in the circulation discharge channel, the second valve regulating the flow rate of the refrigerant liquid between the battery module housing and the liquid storage tank.

[0027] The battery pack may include a battery pack housing, which separately houses the battery module and the electrical unit. The battery pack housing may include: a battery module housing for housing the battery module; and an electrical unit housing for housing the electrical unit. The refrigerant liquid circulates in the battery module housing, the circulation channel, and the electrical unit housing.

[0028] The battery pack cooling system may include: a door that is openably and closably attached to the upper part of an opening in the battery pack housing, the door comprising: a module housing main body door disposed above the opening in the battery module housing; and an electrical unit housing main body door disposed above the opening in the electrical unit housing.

[0029] (III) Beneficial Effects

[0030] A battery pack and a battery pack cooling system including the battery pack according to an embodiment of the present disclosure can improve the space efficiency for immersion cooling.

[0031] The battery pack and battery pack cooling system disclosed herein can achieve overall space and weight reduction by separating the cooling spaces for the battery and electrical components.

[0032] The battery pack disclosed herein and the battery pack cooling system including the battery pack enable individual maintenance of the battery and electrical components, thereby improving maintenance convenience. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of a battery pack cooling system according to an embodiment of the present disclosure.

[0034] Figure 2 This is a diagram showing the battery pack that constitutes the battery pack cooling system.

[0035] Figure 3 This is a diagram showing the battery pack casing that makes up the battery pack.

[0036] Figure 4 It is Figure 2 The diagram shows a cross-sectional view of the battery pack taken along line A1-A2.

[0037] Figure 5 This is a block diagram of a battery pack cooling system according to an embodiment of the present disclosure.

[0038] Figure 6 This is a diagram showing the electrical units that make up a battery pack.

[0039] Figure 7 yes Figure 6 An exploded 3D view of the electrical unit. Detailed Implementation

[0040] The following is for reference Figures 1 to 7 This disclosure will be described in detail. However, this is merely exemplary, and the disclosure is not limited to the specific embodiments described herein.

[0041] The battery module 200 applicable to this disclosure can be used with pouch cells, cylindrical cells, prismatic cells, etc. The cells 220 constituting the battery module can be of the winding type, stacking type, Z-folding type, or stack-folding type.

[0042] In this specification, the coordinate system may be a Cartesian coordinate system. In this specification, the forward and backward directions and the left and right directions may be... Figure 2 Set as a baseline.

[0043] The forward and backward directions can be parallel to the X-axis. For example, the positive X-axis direction can represent forward. Similarly, the negative X-axis direction can represent backward.

[0044] The left and right directions can be parallel to the Y-axis. For example, the positive Y-axis direction can represent the right side. Similarly, the negative Y-axis direction can represent the left side.

[0045] The vertical direction can be parallel to the Z-axis. For example, the positive Z-direction can represent upward. Similarly, the negative Z-direction can represent downward. The Y-axis can be perpendicular to both the X-axis and the Z-axis.

[0046] Reference Figure 1 and Figure 2 The battery pack cooling system 1 according to this disclosure may include a battery module 200 and an electrical unit 300 disposed in separate spaces. The refrigerant liquid circulating in the battery pack cooling system 1 may flow sequentially through the electrical unit 300 and the battery module 200.

[0047] The battery module 200 and the electrical unit 300 can be immersed in a coolant liquid within their respective separate spaces. The coolant liquid can be a non-conductive liquid used to implement immersion cooling of the battery pack cooling system 1. Figure 1 The middle arrow indicates the flow of refrigerant liquid.

[0048] The battery pack cooling system 1 may include a battery pack 10. The battery pack 10 may form a space to be supplied with liquid refrigerant for immersion cooling. The battery pack 10 may be divided into multiple spaces.

[0049] For example, the multiple spaces that are separated may include a space for accommodating the battery module 200, a space for accommodating the electrical unit 300, and a space for accommodating the built-in pump 400 disposed between the battery module 200 and the electrical unit 300.

[0050] The battery pack 10 may include a battery pack housing 100. The battery pack housing 100 may form a hollow, empty space. The battery pack housing 100 may include multiple spaces. The battery pack housing 100 may be divided into multiple spaces. The multiple spaces forming the battery pack housing 100 may include multiple housings 110, 120, and 130. The multiple housings 110, 120, and 130 may be arranged adjacent to each other.

[0051] The battery pack housing 100 may include a battery module housing 110. The battery module housing 110 may be hollow. The battery module housing 110 may open in one direction. For example, the battery module housing 110 may open upwards. The battery module housing 110 may accommodate the battery module 200.

[0052] The battery pack housing 100 may include an electrical unit housing 120. The electrical unit housing 120 may be hollow. The electrical unit housing 120 may open in one direction. For example, the electrical unit housing 120 may open upwards. The electrical unit housing 120 may accommodate an electrical unit 300.

[0053] The battery pack housing 100 may include a pump housing 130. The pump housing 130 may be hollow. The pump housing 130 may open in one direction. For example, the pump housing 130 may open upwards. The pump housing 130 may accommodate a built-in pump 400.

[0054] The battery pack housing 100 may include a first valve 500. The first valve 500 may connect the battery module housing 110 and the pump housing 130. The first valve 500 may regulate the flow rate of refrigerant liquid between the battery module housing 110 and the pump housing 130. For example, the first valve 500 may regulate the flow rate of refrigerant liquid from the pump housing 130 to the battery module housing 110.

[0055] The battery module 200 housed in the battery module housing 110 and the electrical unit 300 housed in the electrical unit housing 120 can be separated and subjected to immersion cooling. For example, a built-in pump 400 and a first valve 500 can be disposed between the battery module housing 110 and the electrical unit housing 120. For example, the battery module housing 110 and the electrical unit housing 120 can be connected via the built-in pump 400 and the first valve 500.

[0056] The refrigerant flowing into the electrical unit housing 120 can cool the electrical unit 300. The refrigerant flowing through the electrical unit housing 120 can flow into the battery module housing 110 via the built-in pump 400 and the first valve 500. Thus, the battery module 200 and the electrical unit 300 can be individually immersed and cooled in separate spaces.

[0057] As described above, in addition to the space for cooling the battery module 200, a separate space can be formed for cooling the electrical unit 300. Previously, because the battery module 200 and the electrical unit 300 were housed in the same space, there was a problem that the required space increased due to the use of large busbars.

[0058] On the other hand, according to this disclosure, by separating the battery module 200 and the electrical unit 300, the size of the busbar can be reduced to achieve miniaturization of the electrical unit 300. For example, by increasing individual immersion cooling of the electrical unit 300, the use of large busbars that were previously used due to heat generation can be suppressed.

[0059] This disclosure improves the space efficiency of a vehicle by integrating the electrical unit 300 into the electrical unit housing 120. For example, by housing the electrical unit 300 in the electrical unit housing 120, which was previously only used as a storage space for refrigerant, the efficiency of individual cooling of the electrical unit 300 and space utilization can be improved.

[0060] The battery pack cooling system 1 may include a cooler 20. The cooler 20 can cool the refrigerant liquid that has heated up during the cooling process inside the battery pack 10. The cooler 20 can exchange heat with the heated refrigerant liquid through a heat exchange device.

[0061] The battery pack cooling system 1 may include a reservoir 30. The reservoir 30 may temporarily store the refrigerant liquid discharged from the battery pack 10. The reservoir 30 may purify or refine the refrigerant liquid containing impurities during the immersion cooling process of the battery pack 10. For example, the reservoir 30 may filter out impurities (particles) contained in the refrigerant liquid.

[0062] The receiver 30 can discharge venting gas generated during the circulation of the refrigerant liquid. For example, the venting gas in the receiver 30 can be discharged to the outside environment at atmospheric pressure.

[0063] The battery pack cooling system 1 may include an external pump 40. The external pump 40 may be disposed between the cooler 20 and the reservoir 30. For example, the external pump 40 may enable the flow of refrigerant liquid between the reservoir 30 and the cooler 20. For example, the external pump 40 may cause the refrigerant liquid discharged from the reservoir 30 to flow to the cooler 20.

[0064] The battery pack cooling system 1 may include a second valve 50. The second valve 50 may connect the battery pack 10 and the reservoir 30. For example, the second valve 50 may allow refrigerant liquid to flow between the battery pack 10 and the reservoir 30. For example, the second valve 50 may allow refrigerant liquid to flow between the battery module housing 110 and the reservoir 30.

[0065] The battery pack cooling system 1 may include a circulation channel 60. The circulation channel 60 may refer to a flow channel for refrigerant liquid centered on the battery pack 10. The circulation channel 60 may include a circulation supply channel 61. The circulation supply channel 61 may pass through the electrical unit housing 120. For example, the circulation supply channel 61 may pass through the front and rear of the electrical unit housing body 121.

[0066] The circulation supply channel 61 can be connected to the cooler 20 and the electrical unit housing 120. For example, the circulation supply channel 61 can allow refrigerant liquid cooled and filtered by the cooler 20 to flow to the electrical unit housing 120. The circulation supply channel 61 can be used as a refrigerant liquid supply pipe for the battery pack 10.

[0067] The circulation channel 60 may include a circulation discharge channel 62. The circulation discharge channel 62 may pass through the battery module housing 110. For example, the circulation discharge channel 62 may pass through the left side face 111SL of the battery module housing body.

[0068] The refrigerant liquid can flow sequentially from the circulation supply channel 61 through the electrical unit housing 120, the battery module housing 110, and the circulation discharge channel 62. As a result, the electrical unit housing 120 and the battery module housing 110 can be cooled independently.

[0069] On the other hand, the circulating discharge channel 62 can be symmetrical with respect to the second battery pack cooling channel 620, centered on the battery module 200. For example, the circulating discharge channel 62 can pass through the rear face 111R of the battery module housing.

[0070] The recirculation drain channel 62 can be connected to the second valve 50 and the battery module housing 110. For example, the recirculation drain channel 62 can allow the refrigerant liquid that has heated in the battery module housing 110 to flow to the second valve 50.

[0071] The circulating discharge channel 62 can be used as a refrigerant liquid discharge pipe for the battery pack 10. Alternatively, the circulating discharge channel 62 can be connected to the battery module housing 110 and the liquid storage tank 30.

[0072] The second valve 50 can be installed in the circulation discharge channel 62. The second valve 50 can adjust the flow rate of the refrigerant liquid flowing in the circulation discharge channel 62 by adjusting the opening and closing degree of the circulation discharge channel 62.

[0073] The circulation channel 60 may include an intermediate circulation channel 63. The intermediate circulation channel 63 may be connected to the second valve 50, the liquid storage tank 30, the external pump 40, and the cooler 20.

[0074] The intermediate circulation channel 63 may include multiple circulation channels. These multiple circulation channels can be sequentially connected from the second valve 50 to the reservoir 30, the external pump 40, and the cooler 20.

[0075] For example, the multiple circulation channels may include: a first circulation channel connecting the second valve 50 and the liquid storage tank 30; a second circulation channel connecting the liquid storage tank 30 and the external pump 40; and a third circulation channel connecting the external pump 40 and the cooler 20.

[0076] Reference Figure 2 and Figure 3The battery pack housing 100 can extend in one direction. For example, the battery pack housing 100 can extend in a front-to-back direction. The length direction of the battery pack housing 100 can be parallel to the front-to-back direction. The width direction of the battery pack housing 100 can be parallel to the left-to-right direction. The thickness direction of the battery pack housing 100 can be parallel to the top-to-bottom direction.

[0077] The battery pack housing 100 may include a battery module housing 110. The battery module housing 110 may form part of the battery pack housing 100. For example, the battery module housing 110 may form the rear portion of the battery pack housing 100.

[0078] The battery module housing 110 may include a battery module housing body 111. For example, the battery module housing body 111 may be formed into a hollow quadrilateral frame shape.

[0079] The battery module housing body 111 may include a front portion 111F. The front portion 111F may be located in front of the battery module 200. The battery module housing body 111 may also include a rear portion 111R. The rear portion 111R may be located behind the battery module 200.

[0080] The front portion 111F and the rear portion 111R of the battery module housing body can be spaced apart from each other. For example, the front portion 111F of the battery module housing body can be located in front of the rear portion 111R of the battery module housing body.

[0081] The battery module housing body 111 may include a left side face 111SL. The left side face 111SL of the battery module housing body may be located on the left side of the battery module 200.

[0082] The battery module housing body 111 may include a right side face 111SR. The right side face 111SR may be located on the right side of the battery module 200. The left side face 111SL and the right side face 111SR may be spaced apart.

[0083] The front face 111F, left face 111SL, rear face 111R, and right face 111SR of the battery module housing body can form the periphery of the battery module housing 110.

[0084] The front part 111F, the left side part 111SL, the rear part 111R, and the right side part 111SR of the battery module housing can be connected in sequence.

[0085] The battery module housing body 111 may include a lower portion 111B. The lower portion 111B may form the lower surface of the battery module housing 110.

[0086] The battery module housing 110 may include a module housing body receiving portion 112. The module housing body receiving portion 112 may form a space for accommodating the battery module 200. The module housing body receiving portion 112 may also form a space for storing refrigerant liquid.

[0087] The battery module housing 110 may include a main body door 113. The main body door 113 may be located above the opening of the battery module housing 110.

[0088] The module housing main body door 113 can be rotatably attached to the upper end of the battery module housing main body 111. For example, the module housing main body door 113 can be hinged to the upper end of the rear face 111R of the battery module housing main body. The battery module housing 110 can achieve an upper opening by rotating the module housing main body door 113.

[0089] This allows for easy access to the battery module 200 housed within the battery module housing 110. In other words, if the battery module 200 malfunctions, it can be immediately maintained through the main body door 113 of the housing.

[0090] The battery pack housing 100 may include an electrical unit housing 120. The electrical unit housing 120 may form part of the battery pack housing 100. For example, the electrical unit housing 120 may form a front portion of the battery pack housing 100. For example, the electrical unit housing 120 may be located in front of the battery module housing 110.

[0091] The electrical unit housing 120 may include an electrical unit housing body 121. For example, the electrical unit housing body 121 may be formed into a hollow quadrilateral frame shape. The electrical unit housing body 121 may include a front portion 121F. The front portion 121F may be located in front of the electrical unit 300.

[0092] The electrical unit housing body 121 may include a rear portion 121R. The rear portion 121R may be located behind the electrical unit 300. The front portion 121F and the rear portion 121R may be spaced apart from each other. For example, the front portion 121F may be located in front of the rear portion 121R.

[0093] The rear portion 121R of the electrical unit housing and the front portion 111F of the battery module housing can be connected front to back. The rear portion 121R of the electrical unit housing can be located in front of the front portion 111F of the battery module housing. The rear portion 121R of the electrical unit housing and the front portion 111F of the battery module housing can be integrally formed.

[0094] The electrical unit housing body 121 may include a left side face 121SL. The left side face 121SL of the electrical unit housing body may be located on the left side of the electrical unit 300.

[0095] The electrical unit housing body 121 may include a right side face 121SR. The right side face 121SR may be located on the right side of the electrical unit 300. The left side face 121SL and the right side face 121SR may be spaced apart.

[0096] The right side face 121SR of the electrical unit housing and the right side face 111SR of the battery module housing can be aligned in a straight line along the front-to-back direction. For example, the right side face 121SR of the electrical unit housing and the right side face 111SR of the battery module housing can form the right side face of the battery pack housing 100.

[0097] The front part 121F, the left side part 121SL, the rear part 121R, and the right side part 121SR of the electrical unit housing body can form the peripheral part of the electrical unit housing 120.

[0098] The front part 121F, the left side part 121SL, the rear part 121R, and the right side part 121SR of the electrical unit housing body can be connected in sequence to form the electrical unit housing 120.

[0099] The lower surface of the electrical unit housing 120 may be shared with the lower surface of the battery module housing 110. For example, the lower part 111B of the battery module housing body may include the lower surface of the electrical unit housing 120.

[0100] The electrical unit housing 120 may include an electrical unit housing main door 123. The electrical unit housing main door 123 may be located at the upper part of the opening of the electrical unit housing 120.

[0101] The main door 123 of the electrical unit housing can be rotatably attached to the upper end of the main body 121 of the electrical unit housing. For example, the main door 123 of the electrical unit housing can be hinged to the upper end of the front part 121F of the main body 121 of the electrical unit housing.

[0102] The electrical unit housing 120 can be opened at the top by rotating the main door 123 of the electrical unit housing. This allows easy access to the electrical unit 300 housed inside the electrical unit housing 120.

[0103] When the electrical unit 300 housed within the electrical unit housing 120 malfunctions, it can be immediately maintained through the main door 123 of the electrical unit housing. That is, with only the electrical unit 300 housed within the electrical unit housing 120, maintenance can be performed solely based on the malfunction of the electrical unit 300, regardless of whether the battery module 200 is malfunctioning.

[0104] Furthermore, with the increasing demand for fast charging of battery packs, the electrical components connected to the battery module 200 may be subjected to overload. Therefore, efficient cooling of the electrical unit 300 can be implemented.

[0105] The battery pack housing 100 may include a pump housing 130. The pump housing 130 may form part of the battery pack housing 100. For example, the pump housing 130 may form the front portion of the battery pack housing 100.

[0106] The pump housing 130 may include a pump housing body 131. For example, the pump housing body 131 may be formed into a hollow quadrilateral frame shape. The pump housing body 131 may include a front portion 131F. The front portion 131F may be located in front of the built-in pump 400.

[0107] The pump housing body 131 may include a rear portion 131R. The rear portion 131R may be located behind the built-in pump 400. The front portion 131F and the rear portion 131R may be spaced apart. For example, the front portion 131F may be located in front of the rear portion 131R.

[0108] The rear portion 131R of the pump housing body and the front portion 111F of the battery module housing body can be connected front to back. The rear portion 131R of the pump housing body can be located in front of the front portion 111F of the battery module housing body. The rear portion 131R of the pump housing body and the front portion 111F of the battery module housing body can be integrally formed.

[0109] The pump housing body 131 may include a left side face 131SL of the pump housing body. The left side face 131SL of the pump housing body may be located on the left side of the built-in pump 400.

[0110] The pump housing body 131 may include a right side facet 131SR. The right side facet 131SR may be located to the right of the built-in pump 400. The left side facet 131SL and the right side facet 131SR may be spaced apart.

[0111] The left side face 131SL of the pump housing body and the left side face 111SL of the battery module housing body can be aligned in a straight line along the front-to-back direction. For example, the left side face 131SL of the pump housing body and the left side face 111SL of the battery module housing body can form the left side face of the battery pack housing 100.

[0112] The front part 131F, the left side part 131SL, the rear part 131R, and the right side part 131SR of the pump housing body can form the periphery of the pump housing 130.

[0113] The front portion 131F, left side portion 131SL, rear portion 131R, and right side portion 131SR of the pump housing body can be sequentially connected to form the pump housing 130. The lower surface of the pump housing 130 can be shared with the lower surface of the battery module housing 110. For example, the lower portion 111B of the battery module housing body may include the lower surface of the pump housing 130.

[0114] The pump housing 130 may include a pump housing body door 133. The pump housing body door 133 may be disposed above the opening of the pump housing 130. The pump housing body door 133 may be rotatably coupled to the upper end of the pump housing body 131.

[0115] For example, the pump housing body door 133 can be hinged to the upper end of the front part 131F of the pump housing body.

[0116] The pump housing 130 can be opened at the top by rotating the pump housing body door 133. This allows easy access to the built-in pump 400 located inside the pump housing 130.

[0117] Reference Figure 2 and Figure 4 The battery module 200 may include a battery module housing 210. The battery module housing 210 may extend in one direction. For example, the battery module housing 210 may extend in a front-to-back direction.

[0118] The battery module 200 may include battery cells 220. Battery cells 220 may be stacked in the front-to-back direction. Battery cells 220 may be stacked in the thickness direction of battery cells 220. Battery cells 220 may include electrode assemblies 221, an outer casing material 222 covering the electrode assemblies 221, and a sealing portion 223 formed on one side of the outer casing material 222.

[0119] The battery pack 10 may include a battery pack cooling channel 600. The battery pack cooling channel 600 may include a first battery pack cooling channel 610. The first battery pack cooling channel 610 may connect the electrical unit 300 and the built-in pump 400. The first battery pack cooling channel 610 may pass through the left side face 121SL of the electrical unit housing and the right side face 131SR of the pump housing.

[0120] The battery pack cooling channel 600 may include a second battery pack cooling channel 620. The second battery pack cooling channel 620 may connect the built-in pump 400 and the battery module housing 110. The second battery pack cooling channel 620 may pass through the rear portion 131R of the pump housing body and the front portion 111F of the battery module housing body.

[0121] The first valve 500 can be located in the cooling channel 620 of the second battery pack. For example, the first valve 500 can regulate the flow rate of refrigerant liquid from the built-in pump 400 to the battery module housing 110.

[0122] The second battery pack cooling channel 620 and the circulation discharge channel 62 can be arranged before and after the battery module 200. The refrigerant liquid flowing into the battery module housing 110 through the second battery pack cooling channel 620 can be discharged to the outside of the battery module housing 110 through the circulation discharge channel 62.

[0123] For example, the refrigerant liquid flowing into the battery module housing 110 can uniformly and continuously cool the multiple cells 220 constituting the battery module 200 in the front-back direction.

[0124] Figure 5 This is a block diagram of a battery pack cooling system 1 according to an embodiment of the present disclosure. (Refer to...) Figure 5 According to one embodiment of the present disclosure, the battery pack cooling system 1 may include a control unit 70.

[0125] The control unit 70 can perform calculations. The control unit 70 can process signals. The battery pack cooling system 1 may include a sensor unit 80. The sensor unit 80 can measure physical quantities within the battery pack 10. For example, the sensor unit 80 can measure physical quantities including temperature, flow rate, and pressure within the battery pack 10.

[0126] For example, the sensor unit 80 can measure the temperature of the refrigerant liquid flowing through the battery pack 10 in real time. For example, the control unit 70 can obtain the temperature of the refrigerant liquid flowing through the battery pack 10 in real time through the sensor unit 80. Therefore, it can be compared with a preset temperature rise limit temperature of the control unit 70.

[0127] The sensor unit 80 may include a first sensor 81. The first sensor 81 may be disposed in the battery module housing 110. For example, the first sensor 81 may measure in real time the temperature of the refrigerant liquid flowing through the module housing body receiving portion 112 of the battery module housing 110.

[0128] The sensor unit 80 may include a second sensor 82. The second sensor 82 may be disposed in the electrical unit housing 120. For example, the second sensor 82 may measure in real time the temperature of the refrigerant liquid flowing through the electrical unit 300 disposed in the electrical unit housing 120.

[0129] For example, the control unit 70 may receive input signals S1 and S2, and generate output signals S3, S4, S5, and S6 based on the input signals S1 and S2. The input signals S1 and S2 may include or represent at least one of the first signal S1 and the second signal S2.

[0130] The output signals S3, S4, S5, and S6 may include or represent at least one of the third signal S3, the fourth signal S4, the fifth signal S5, and the sixth signal S6.

[0131] The first sensor 81 can generate a first signal S1 regarding the input and transmit it to the control unit 70. The first signal S1 may include information about the temperature measurement of the refrigerant liquid supplied to the battery module housing 110. The refrigerant liquid supplied to the battery module housing 110 can immerse the battery module 200 for cooling.

[0132] The second sensor 82 can generate a second signal S2 regarding the input and transmit it to the control unit 70. The second signal S2 may include information about the temperature measurement of the refrigerant liquid supplied to the electrical unit housing 120. The refrigerant liquid supplied to the electrical unit housing 120 can immerse and cool the electrical unit 300.

[0133] The control unit 70 can generate a third signal S3 based on the input signals S1 and S2. For example, the control unit 70 can generate the third signal S3 based on the first signal S1. The control unit 70 can obtain the temperature of the refrigerant liquid inside the battery module housing 110 through the first signal S1.

[0134] To ensure the stable operation of the battery module 200 stored in the battery module housing 110, the control unit 70 can set the limit temperature rise of the refrigerant liquid in the battery module housing 110, i.e., the first limit temperature.

[0135] The third signal S3 may include adjustment information regarding the first valve 500. The control unit 70 may compare the refrigerant liquid temperature inside the battery module housing 110 obtained through the first signal S1 with a preset first limit temperature in the control unit 70. The opening degree of the first valve 500 may be adjusted based on the compared temperature information.

[0136] The control unit 70 can generate a fourth signal S4 based on the input signals S1 and S2. For example, the control unit 70 can generate the fourth signal S4 based on the first signal S1. The control unit 70 can obtain the refrigerant liquid temperature in the electrical unit 300 through the first signal S1. The fourth signal S4 may include adjustment information about the second valve 50.

[0137] The control unit 70 can compare the temperature of the refrigerant liquid inside the battery module housing 110, obtained through the first signal S1, with a preset first limit temperature in the control unit 70. The opening degree of the second valve 50 can be adjusted based on the compared temperature information.

[0138] That is, with the battery module housing 110 as the center, the flow of refrigerant liquid stored in the battery module housing 110 can be adjusted by regulating the first valve 500 and the second valve 50. Thus, the temperature of the refrigerant liquid stored in the battery module housing 110 can be adjusted.

[0139] The control unit 70 can generate a fifth signal S5 based on the input signals S1 and S2. For example, the control unit 70 can obtain the refrigerant liquid temperature of the battery module housing 110 and the electrical unit 300 through the input signals S1 and S2.

[0140] To ensure the stable operation of the battery module 200 and the electrical unit 300, the control unit 70 can operate the built-in pump 400. For example, the refrigerant liquid stored in the electrical unit housing 120 can be pumped to the battery module housing 110.

[0141] The control unit 70 can generate a sixth signal S6 based on the input signals S1 and S2. For example, the control unit 70 can obtain the refrigerant liquid temperature of the battery module housing 110 and the electrical unit 300 through the input signals S1 and S2.

[0142] To ensure the stable operation of the battery module 200 and the electrical unit 300, the control unit 70 can operate the external pump 40. For example, the refrigerant liquid stored in the liquid storage tank 30 can be pumped to the cooler 20.

[0143] Reference Figure 6 and Figure 7 The length direction of the electrical unit 300 can be parallel to the left-right direction. For example, the length direction of the electrical unit 300 can be parallel to the width direction of the battery pack 10.

[0144] The electrical unit 300 may include an electrical unit housing 301. The electrical unit housing 301 may be hollow. The electrical unit housing 301 may extend in one direction. The electrical unit housing 301 may extend in a left-right direction.

[0145] The length of the electrical unit housing 301 can be parallel to the left-right direction. For example, the length of the electrical unit housing 301 can be parallel to the width direction of the battery pack 10. The front and rear of the electrical unit housing 301 can be arranged in the front-back direction. The left and right sides of the electrical unit housing 301 can be arranged in the left-right direction.

[0146] The electrical unit housing 301 may include a lower housing 310. The lower housing 310 may be open upwards. For example, the lower housing 310 may be formed into a downwardly convex shape. For example, the lower housing 310 may be formed into a cuboid shape with an upper opening.

[0147] The lower housing 310 may include a lower housing body 311 and a lower housing body flange 312. The lower housing body 311 may be formed into a cuboid shape with an upper opening.

[0148] The lower housing body flange 312 can be connected to or joined to the upper end of the lower housing body 311. For example, the lower housing body flange 312 can extend outward from the upper end of the lower housing body 311.

[0149] The lower housing 310 may include a refrigerant liquid outlet 313. The refrigerant liquid outlet 313 may be connected to or combined with the lower housing body 311. For example, the refrigerant liquid outlet 313 may be disposed through the left side of the lower housing body 311.

[0150] The lower housing 310 may include an input connector 314. The input connector 314 can electrically connect external devices and the electrical unit 300. The input connector 314 may include a first high-voltage connector 3141.

[0151] The first high-voltage connector 3141 can connect the power relay assembly 330 and the drive motor. The input connector 314 may include a first low-voltage connector 3142. The first low-voltage connector 3142 can connect the battery management system 350 and the vehicle.

[0152] The lower housing 310 may include an output connector 315. The output connector 315 can electrically connect the electrical unit 300 and the battery module 200. The output connector 315 may include a second high-voltage connector 3151. The second high-voltage connector 3151 can connect the power relay assembly 330 and the battery module 200.

[0153] The output connector 315 may include a second low-voltage connector 3152. The second low-voltage connector 3152 can connect to the battery management system 350 and the cell management unit (CMU) of the battery module 200. To measure data including temperature and voltage of the cells 220 constituting the battery module 200, a large number of sensors may be required. The cell management unit can integrate a large number of sensors into a single module for management.

[0154] The output connector 315 can connect the electrical unit 300 and the battery module 200 via the lower surface of the battery pack 10. For example, the output connector 315 can be embedded in the lower part 111B of the battery module housing body. For example, the output connector 315 can include a busbar shape embedded in the lower part of the battery pack housing 100.

[0155] The electrical unit housing 301 may include an upper housing 320. The upper housing 320 may open downwards. For example, the upper housing 320 may be formed into an upwardly convex shape. For example, the upper housing 320 may be formed into a cuboid shape with an opening at the bottom.

[0156] The upper housing 320 may include an upper housing body 321 and an upper housing body flange 322. The upper housing body 321 may be formed into a cuboid shape with an opening at the bottom. The upper housing body flange 322 may be connected to or attached to the lower end of the upper housing body 321. For example, the upper housing body flange 322 may extend outward from the lower end of the upper housing body 321.

[0157] Electrical unit 300 may include a power relay assembly (PRA) 330. The power relay assembly 330 may be disposed within electrical unit housing 301. The power relay assembly 330 may include a power relay assembly body 331 and a power relay assembly protrusion 332 connected to one side of the power relay assembly body 331.

[0158] For example, the power relay assembly body 331 and the power relay assembly protrusion 332 may be arranged in a row along the length of the electrical unit housing 301. On the other hand, the power relay assembly protrusion 332 may be eccentrically disposed on one side of the power relay assembly body 331. For example, the power relay assembly protrusion 332 may extend from one edge of the power relay assembly body 331 along the length of the electrical unit housing 301.

[0159] The power relay assembly 330 may include a power relay assembly recess 333. The power relay assembly recess 333 may extend through the upper and lower surfaces of the power relay assembly 330. The power relay assembly recess 333 may be connected to the upper and lower surfaces of the power relay assembly 330.

[0160] The power relay assembly recess 333 can be connected to the power relay assembly body 331 and the power relay assembly protrusion 332. The boundary of the power relay assembly recess 333 can be connected to a portion of the outer surface of the power relay assembly body 331 and a portion of the outer surface of the power relay assembly protrusion 332.

[0161] Electrical unit 300 may include bracket 340. Bracket 340 may be located in the power relay assembly recess 333. Bracket 340 may include bracket body 341. Bracket body 341 may be formed in the shape of a plate or board.

[0162] The support 340 may include support legs 342. Support legs 342 may be connected to or coupled to the support body 341. For example, support legs 342 may extend downward from the lower end of the support body 341.

[0163] The support leg 342 can be elastically attached to the support body 341. For example, the support leg 342 and the support body 341 can be hinged together. Thus, the height of the support 340 can be adjusted by adjusting the engagement angle of the support leg 342.

[0164] The electrical unit 300 may include a battery management system 350. The battery management system 350 may be connected to or mounted on the bracket 340. For example, the battery management system 350 may be mounted on the upper end of the bracket body 341.

[0165] Therefore, the battery management system 350 can be located in the power relay assembly recess 333. Thus, the battery management system 350 can be cooled in a region separate from the power relay assembly 330.

[0166] The power relay assembly 330 and the battery management system 350 can be arranged along the length of the electrical unit housing 301. Therefore, the refrigerant liquid flowing into and along the length of the electrical unit housing 301 can sequentially and continuously cool the power relay assembly 330 and the battery management system 350.

[0167] Electrical unit 300 may include a gasket 360. The gasket 360 may be disposed between the lower housing 310 and the upper housing 320. The gasket 360 may seal between the lower housing 310 and the upper housing 320. The gasket 360 may prevent refrigerant liquid flowing into the electrical unit housing 301 from leaking.

[0168] The battery pack and cooling system including the battery pack according to embodiments of the present disclosure have been described above with reference to specific implementation methods. However, these are merely examples and the present disclosure is not limited thereto. It should be understood to cover the maximum scope based on the basic ideas disclosed in this specification.

Claims

1. A battery pack, characterized in that, include: A battery pack housing, to which a refrigerant liquid for immersion cooling is supplied; The battery module is housed within the battery pack casing; as well as The electrical unit is housed within the battery pack casing and is separate from the battery module. The battery pack housing includes: A battery module housing for accommodating the battery module; as well as An electrical unit housing for accommodating the electrical unit. The refrigerant liquid flows in the battery module housing and the electrical unit housing.

2. The battery pack according to claim 1, characterized in that, Further includes: An internal pump is housed within a pump housing that forms part of the battery pack housing; as well as The first valve regulates the flow rate of the refrigerant liquid between the built-in pump and the battery module housing.

3. The battery pack according to claim 2, characterized in that, Further includes: A circulation channel, connected to the battery pack housing, through which the refrigerant liquid flows. The circulation channel includes: A circulating supply channel is connected to the housing of the electrical unit; as well as The circulating discharge channel is connected to the battery module housing. The refrigerant liquid flows sequentially from the circulation supply channel through the electrical unit housing, the battery module housing, and the circulation discharge channel.

4. The battery pack according to claim 3, characterized in that, The electrical unit housing is located in front of the battery module housing.

5. The battery pack according to claim 4, characterized in that, Further includes: The battery pack cooling channels are located inside the battery pack casing. The battery pack cooling channels include: The first battery pack cooling channel connects the electrical unit and the built-in pump; as well as The second battery pack cooling channel connects the built-in pump and the battery module housing. The first valve is located in the cooling channel of the second battery pack.

6. The battery pack according to claim 5, characterized in that, include: The door is closable and attaches to the upper part of the opening in the battery pack housing. The gate includes: The main door of the module housing is located above the opening of the battery module housing; as well as The main door of the electrical unit housing is located at the top of the opening of the electrical unit housing.

7. The battery pack according to claim 6, characterized in that, The electrical unit includes: An electrical unit housing is connected to the circulating supply channel, and refrigerant liquid is supplied to the electrical unit housing; The power relay assembly is housed within the electrical unit housing; and The battery management system is disposed adjacent to the power relay assembly.

8. The battery pack according to claim 7, characterized in that, The battery management system is disposed in the power relay assembly recess formed in the power relay assembly. The electrical unit includes a bracket disposed in the recess of the power relay assembly, and the battery management system is supported by the bracket.

9. The battery pack according to claim 8, characterized in that, The electrical unit housing includes: The lower housing has a refrigerant liquid outlet connected to the cooling channel of the first battery pack; and The upper housing is attached to the upper part of the opening of the lower housing and has a refrigerant liquid inlet connected to the circulation supply channel.

10. The battery pack according to claim 9, characterized in that, The battery module includes: Battery module housing; and The battery cells are housed within the battery module housing. The battery cells are stacked in the front-to-back direction.

11. The battery pack according to claim 10, characterized in that, The battery module housing and the electrical unit housing are arranged adjacent to each other. The electrical unit and the battery module are connected by a busbar embedded in the lower part of the battery pack housing.

12. A battery pack cooling system, characterized in that, include: A battery pack, which separately houses battery modules and electrical units electrically connected to the battery modules, and a refrigerant liquid for immersion cooling is supplied to the battery pack; A circulation channel is connected to the battery pack; A cooler is provided in the circulation channel and is used to cool the refrigerant liquid; as well as A liquid storage tank is provided in the circulation channel and stores the refrigerant liquid discharged from the battery pack.

13. The battery pack cooling system according to claim 12, characterized in that, The circulation channel includes: A circulating supply channel is connected to the electrical unit; A circulation discharge channel is connected to a battery module housing that contains the battery module; and The second valve is located in the circulating discharge channel. The second valve regulates the flow rate of the refrigerant liquid between the battery module housing and the liquid storage tank.

14. The battery pack cooling system according to claim 12 or 13, characterized in that, The battery pack includes a battery pack housing, which separately houses the battery modules and the electrical units. The battery pack housing includes: A battery module housing for accommodating the battery module; and An electrical unit housing for accommodating the electrical unit. The refrigerant liquid circulates in the battery module housing, the circulation channel, and the electrical unit housing.

15. The battery pack cooling system according to claim 14, characterized in that, include: The door is closable and attaches to the upper part of the opening in the battery pack housing. The gate includes: The main door of the module housing is located above the opening of the battery module housing; as well as The main door of the electrical unit housing is located at the top of the opening of the electrical unit housing.

Images