Title of Invention: Battery module and battery pack including same
technical field
[One]
Cross-Citation with Related Application(s)
[2]
This application claims the benefit of priority based on Korean Patent Application No. 10-2020-0048652 dated April 22, 2020, and all contents disclosed in the literature of the Korean patent application are incorporated as a part of this specification.
[3]
The present invention relates to a battery module and a battery pack including the same, and more particularly, to a battery module for improving cooling performance and a battery pack including the same.
background
[4]
Secondary batteries are receiving a lot of attention as an energy source in various product groups such as mobile devices and electric vehicles. Such a secondary battery is a powerful energy resource that can replace the use of conventional products using fossil fuels, and is in the spotlight as an eco-friendly energy source because by-products due to energy use do not occur.
[5]
Recently, as the need for a high-capacity secondary battery structure, including the use of secondary batteries as an energy storage source, increases, the demand for a battery pack having a multi-module structure in which a plurality of secondary batteries are assembled in series/parallel connected battery pack is increasing. .
[6]
On the other hand, when configuring a battery pack by connecting a plurality of battery cells in series/parallel, a battery module composed of battery cells is configured, and other components are added using at least one battery module to configure the battery pack. How to do it is common
[7]
Such a battery module includes a battery cell stack in which a plurality of battery cells are stacked, a module frame accommodating the battery cell stack, and a heat sink for cooling the plurality of battery cells.
[8]
1 is a view showing a battery module combined with a conventional heat sink.
[9]
Referring to FIG. 1 , a conventional battery module includes a battery cell stack in which a plurality of battery cells 10 are stacked, a module frame accommodating the battery cell stack, and a bottom portion 20 of the module frame and the battery cell stack. and a thermally conductive resin layer 15 positioned between the sieves. Such a battery module may be formed under the module frame bottom 20 and combined with a heat sink 30 that provides a cooling function to the plurality of battery cells 10 to form a battery pack. Here, a heat-conducting layer 18 may be further formed between the bottom 20 of the battery module and the heat sink 30 . In this case, the heat sink includes a lower plate 31 and an upper plate 29 , and a refrigerant may flow between the lower plate 31 and the upper plate 29 .
[10]
Conventionally, in order to improve the cooling performance of the battery module and/or the battery pack, a separate cooling structure, for example, a heat sink is required in the battery pack unit. Accordingly, the cooling structure tends to be complicated, and the refrigerant and the battery cell stack 10 are formed in a multi-layered structure including the upper plate 29 and the module frame bottom 29, thereby indirectly cooling the battery cells. There were limits to what could be done.
DETAILED DESCRIPTION OF THE INVENTION
technical challenge
[11]
SUMMARY OF THE INVENTION An object of the present invention is to provide a battery module and a battery pack that improve cooling performance.
[12]
The problems of the present invention are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.
means of solving the problem
[13]
A battery module according to an embodiment of the present invention for realizing the above object includes: a battery cell stack in which a plurality of battery cells are stacked; a module frame for accommodating the battery cell stack; and a heat sink formed under the module frame to cool the plurality of battery cells, wherein the heat sink includes a lower plate and a flow path that is a flow path of the refrigerant, and the flow path of the flow path includes the battery a first path set in which first paths formed in a direction perpendicular to a stacking direction of the cell stack are collected; and a second path set collecting second paths formed in a direction parallel to the stacking direction of the battery cell stack, wherein the total length of the second path set is longer than the total length of the first path set .
[14]
The second paths forming the second path set may be formed to pass under at least two or more battery cells among a plurality of battery cells forming the battery cell stack.
[15]
At least one of the second paths forming the second path set may be formed to pass under all of the plurality of battery cells forming the battery cell stack.
[16]
The heat sink further includes an inlet through which the refrigerant flows and an outlet through which the refrigerant flows, both the inlet and the outlet are formed on one side of the heat sink, and paths connected to the inlet and the outlet are all It may be the first route.
[17]
The flow path part may further include a partition wall formed inside the flow path part along a direction in which the flow path part is formed.
[18]
The refrigerant flows separately into first and second flow passages formed on the basis of the barrier rib, and the flow path of the first flow passage includes a first collection of 1-1 passages formed in a direction perpendicular to the stacking direction of the battery cell stack. 1-1 path set; and a 2-1 path set that collects 2-1 paths formed in a direction parallel to the stacking direction of the battery cell stack, wherein the flow path of the second flow path includes a stacking direction of the battery cell stack and The first and second paths formed in the vertical direction may include a set of first and second paths; and a 2-2 path set that collects 2-2 paths formed in a direction parallel to the stacking direction of the battery cell stack, wherein the total length of the first path set is the total length of the 1-1 path set. The length is the sum of the length and the total length of the 1-2 path set, and the total length of the second path set is the length obtained by adding the total length of the 2-1 path set and the total length of the 2-2 path set. , and the total length of the second path set may be longer than the total length of the first path set.
[19]
The flow passage further includes sidewall portions forming both side surfaces, the sidewall portion may include: a first sidewall portion formed in a direction perpendicular to the stacking direction of the battery cell stack; and a second sidewall portion formed in a direction parallel to the stacking direction of the battery cell stack, wherein a total length of the second sidewall portion may be formed to be longer than a total length of the first sidewall portion.
[20]
A dimple part may be formed on the surface of the flow path part.
[21]
The flow path part is formed in a structure recessed downward from the lower plate, the upper side of the flow path part is covered by the bottom part of the module frame, and the refrigerant flows into a space between the flow path part and the bottom part of the module frame. can
[22]
A battery pack according to another embodiment of the present invention includes the battery module.
Effects of the Invention
[23]
According to the embodiments of the present invention, the flow path is formed parallel to the stacking direction of the battery cell stack, thereby reducing the temperature deviation between the battery cells during cooling, thereby improving the cooling performance of the battery module.
[24]
In addition, the cooling structure can be simplified through the integrated cooling structure of the module frame and the heat sink.
[25]
Effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.
Brief description of the drawing
[26]
1 is a view showing a battery module combined with a conventional heat sink.
[27]
FIG. 2 is a plan view illustrating a flow path structure of the battery cells of FIG. 1 and a heat sink corresponding thereto, as a comparative example.
[28]
3 is a view illustrating a state in which a refrigerant flows in the flow path structure of FIG. 2 .
[29]
4 is an exploded perspective view of a battery module according to an embodiment of the present invention.
[30]
FIG. 5 is a view showing a state in which the components of the battery module of FIG. 4 are assembled.
[31]
6 is a view of the battery module assembled in FIG. 5 centered on the heat sink formed on the lower part.
[32]
7 is a cross-sectional view illustrating the heat sink of FIG. 6 as viewed in the AA direction by cutting the heat sink in the horizontal direction, in which the flow direction of the refrigerant is indicated.
[33]
8 is a view comparing the flow direction of the refrigerant of FIG. 7 and the stacking direction of the battery cell stack.
[34]
9 is a diagram illustrating a state in which a refrigerant flows through the heat sink of FIG. 8 .
[35]
10 is a view illustrating a flow direction of a refrigerant flowing in a heat sink in which a dimple portion is formed according to a modified example of the present invention.
[36]
11 is a view illustrating a direction in which a refrigerant flows in a heat sink having a partition wall formed thereon according to a modified example of the present invention.
[37]
12 is a view showing a direction in which a refrigerant flows in a heat sink in which a partition wall is formed according to a modified example of the present invention.
Modes for carrying out the invention
[38]
It should be understood that the embodiments described below are illustratively shown to help understanding of the invention, and that the present invention may be implemented with various modifications different from the embodiments described herein. However, in the description of the present invention, if it is determined that a detailed description of a related known function or component may unnecessarily obscure the gist of the present invention, the detailed description and specific illustration thereof will be omitted. In addition, the accompanying drawings are not drawn to scale in order to help understanding of the invention, but dimensions of some components may be exaggerated.
[39]
The first and second terms used in the present application may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.
[40]
In addition, the terms used in the present application are only used to describe specific embodiments, and are not intended to limit the scope of rights. The singular expression includes the plural expression unless the context clearly dictates otherwise. In the present application, terms such as "comprises", "consists of" or "consisting It should be understood that it does not preclude the possibility of addition or existence of further other features or numbers, steps, operations, components, parts, or combinations thereof.
[41]
Hereinafter, a configuration of a battery module according to an embodiment of the present invention will be described with reference to FIGS. 4 and 5 .
[42]
4 is an exploded perspective view of a battery module according to an embodiment of the present invention. FIG. 5 is a view showing a state in which the components of the battery module of FIG. 4 are assembled.
[43]
4 and 5 , the battery module 200 according to an embodiment of the present invention includes a battery cell stack 100 in which a plurality of battery cells are stacked, and a module for accommodating the battery cell stack 100 . The frame 205 and a heat sink 300 formed below the module frame 205 to cool the plurality of battery cells is included.
[44]
The battery cell according to this embodiment is a secondary battery, and may be configured as a pouch-type secondary battery. The battery cells may be configured in plurality, and the plurality of battery cells may be stacked to each other so as to be electrically connected to each other to form the battery cell stack 100 . Each of the plurality of battery cells may include an electrode assembly, a cell case, and an electrode lead protruding from the electrode assembly.
[45]
The module frame 205 accommodates the battery cell stack 100 . According to an embodiment of the present invention, the module frame 205 includes a lower frame 210 that covers the lower surface and both sides of the battery cell stack 100 , and an upper plate that covers the upper surface of the battery cell stack 100 ( 220) may be included. However, the structure of the module frame 205 is not limited thereto, and may be in the form of a mono frame surrounding on four surfaces except for the front and rear surfaces of the battery cell stack 100 .
[46]
The battery module 200 according to the present embodiment may further include an end plate 230 covering the front and rear surfaces of the battery cell stack 100 . It is possible to physically protect the battery cell stack 100 accommodated therein through the module frame 205 described above.
[47]
The heat sink 300 may be formed under the module frame 205 . The heat sink 300 is formed on one side of the lower plate 310 and the heat sink 300 forming a skeleton of the heat sink 300 and in contact with the bottom of the module frame 205 to form the heat sink 300 from the outside. ) The inlet 320 for supplying the refrigerant to the inside, the outlet 330 formed on one side of the heat sink to allow the refrigerant flowing inside the heat sink to flow out of the heat sink, and the inlet 320 and the outlet 330 are connected and a flow path part 340 through which the refrigerant flows.
[48]
Specifically, the flow passage 340 may refer to a structure in which the lower plate 310 in contact with the lower surface of the lower frame 210 corresponding to the bottom of the module frame 205 is depressed downward. The upper side of the flow path part 340 is opened to form a flow path between the flow path part 340 and the bottom of the module frame 205 , and a refrigerant may flow through the flow path. In other words, the battery module 200 according to the present embodiment may have a cooling-integrated structure in which the bottom of the module frame 205 serves to correspond to the upper plate of the heat sink 300 .
[49]
Conventionally, a structure in which a refrigerant flows is separately formed on the lower side of the module frame, so that the module frame has to be indirectly cooled, so cooling efficiency is lowered and a separate refrigerant flow structure is formed on the battery module and the battery pack equipped with the battery module. There was a problem in that the space utilization rate was lowered. However, according to an embodiment of the present invention, by adopting a structure in which the heat sink 300 is integrated in the lower part of the module frame 205 , the refrigerant flows directly between the flow path part 340 and the bottom part of the module frame 205 . As a result, the cooling efficiency according to direct cooling is increased, and the space utilization rate on the battery module and the battery pack in which the battery module is mounted is further improved through the structure in which the heat sink 300 is integrated with the bottom of the module frame 205 . can do it
[50]
Hereinafter, with reference to FIGS. 6 to 9 , the flow path of the heat sink flow path part according to an embodiment of the present invention and effects thereof will be described in comparison with the comparative examples shown in FIGS. 2 and 3 .
[51]
FIG. 2 is a plan view illustrating a flow path structure of the battery cells of FIG. 1 and a heat sink corresponding thereto, as a comparative example. 3 is a view illustrating a state in which a refrigerant flows in the flow path structure of FIG. 2 . 6 is a view of the battery module assembled in FIG. 5 centered on the heat sink formed on the lower part. 7 is a cross-sectional view illustrating the heat sink of FIG. 6 as viewed in the AA direction by cutting the heat sink in the horizontal direction, in which the flow direction of the refrigerant is indicated. 8 is a view comparing the flow direction of the refrigerant of FIG. 7 and the stacking direction of the battery cell stack. 9 is a diagram illustrating a state in which a refrigerant flows through the heat sink of FIG. 8 .
[52]
6 to 9 , in the heat sink 300 according to an embodiment of the present invention, the cooling plate 310 may be formed to correspond to the bottom of the module frame 205 . The bottom portion of the module frame 205 corresponds to the bottom portion of the lower frame 210 , and the bottom portion of the cooling plate 310 and the lower frame 210 may be coupled by welding, and the battery module may be coupled through the cooling plate 310 . The overall rigidity can be reinforced. The cooling plate 310 and the bottom of the lower frame 210 are sealed through welding, so that the refrigerant can flow through the flow path 340 formed inside the cooling plate 310 without leakage.
[53]
Both the inlet 320 and the outlet 330 may be formed on one side of the heat sink 300 . In more detail, both the inlet 320 and the outlet 330 may be formed on one side of the heat sink 300 formed in the portion where the end plate 230 is located. The inlet 320 and the outlet 330 may be respectively located at both ends of one side of the heat sink 300 . A refrigerant supply unit and a refrigerant discharge unit are formed on the lower side or upper side of the heat sink 300 , so that the refrigerant supplied through the refrigerant supply unit may flow into the inlet 320 , and the refrigerant discharged through the outlet 330 may be discharged through the refrigerant discharge unit. can be discharged to the outside.
[54]
The flow path 340 may be formed to cover the bottom of the module frame 205 while being bent. The flow path part 340 is formed in most regions of the bottom part of the module frame 205 except for the part in which the cooling plate 310 is in contact with the bottom part of the module frame 205 , so that the module frame 205 has an upper side of the bottom part. All parts of the battery cell stack 100 disposed to occupy most of the area of ​​the bottom of the module frame 205 may be uniformly cooled.
[55]
According to an embodiment of the present invention, the flow path of the flow path part 340 is, as shown in FIGS. 7 and 8 , a first path formed in a direction perpendicular to the stacking direction of the battery cell stack 100 ( 340a) including a first set of paths (I) and a second set of paths (II) which collects second paths (340b) formed in a direction parallel to the stacking direction of the battery cell stack 100, and the second path The total length of the set (II) is formed to be longer than the total length of the first set of paths (I).
[56]
2 and 3 , the heat sink 30 according to the comparative example of the present invention includes an inlet 32 ​​through which a refrigerant flows, an outlet 33 through which the refrigerant flows, and an inlet 32 ​​and an outlet 33 ) may include a lower plate 31 having a cooling flow path 34 connecting them. As shown in FIG. 2 , the cooling passage 34 may be formed in the main direction in the longitudinal direction of the battery cells 10 . However, as shown in FIG. 3 , the direction in which the cooling passage 34 is formed is formed in a direction parallel to the longitudinal direction of the battery cells 10 stacked on the upper side of the cooling passage 34 , and the left and right sides of the battery cell A difference in cooling temperature may occur depending on the location. As such, when the cooling temperature difference occurs, the cooling of the battery cell stack is not uniformly performed, so there is a risk that the overall cooling performance of the battery module may be deteriorated. In addition, in the case of a large-area battery module in which the number of battery cells stacked in the battery cell stack increases significantly compared to the prior art, the width of the flow path may be formed to be wider, so that the temperature deviation may be more severe.
[57]
Accordingly, according to an embodiment of the present invention, as shown in FIG. 8 , the flow paths of the flow path part 340 include a first path 340a formed in a direction perpendicular to the stacking direction of the battery cell stack 100 . It includes a first path set (I) that collects, and a second path set (II) that collects second paths (340b) formed in a direction parallel to the stacking direction of the battery cell stack 100 . In this case, according to the present embodiment, the total length of the second path set II may be longer than the total length of the first path set I. Therefore, as shown in FIG. 9 , by allowing the refrigerant path flowing across the plurality of battery cells to be formed longer than the path of the refrigerant flowing in parallel to the longitudinal direction of the plurality of battery cells, the temperature deviation between the battery cells can be reduced and the cooling performance can be improved. The effect of reducing the temperature deviation and improving the cooling performance may be more effectively shown in a large-area battery module in which the channel width is formed wider as an embodiment of the present invention.
[58]
According to an embodiment of the present invention, the second paths 340b forming the second path set II are the lower sides of at least two or more battery cells among the plurality of battery cells forming the battery cell stack 100 . It can be formed to pass. In addition, both the inlet 320 and the outlet 330 are formed on one side of the heat sink 300 , and one side of the heat sink 300 on which the inlet 320 and the outlet 330 are formed is a stacked battery cell stack. Since it is located in a direction perpendicular to the direction, all paths connected to the inlet 320 and the outlet 330 may be formed as the first path 340a.
[59]
Referring to FIG. 7 , the flow path portion 340 further includes sidewall portions 343 and 344 forming both side surfaces of the flow passage portion 340 , and the sidewall portions 343 and 344 are, the battery cell stack 100 . including a first sidewall part 343 formed in a direction perpendicular to the stacking direction of ) may be formed to be longer than the total length of the first sidewall portion 343 .
[60]
The side wall portions 343 and 344 form a part of the cooling plate 310 , and upper ends of the side wall portions 343 and 344 may be coupled to the bottom portion of the module frame by welding. Of the sidewall parts 343 and 344 , the length of the second sidewall part 344 formed in a direction parallel to the stacking direction of the battery cell stack is a first sidewall formed in a direction perpendicular to the stacking direction of the battery cell stack 100 . Since the portion 343 is formed to be longer than the length, it is possible to effectively support the load of the plurality of battery cells through the second sidewall portion 344 formed across the lower side of the at least two battery cells.
[61]
10 shows the contents of the heat sink in which the dimple part is formed.
[62]
10 is a view illustrating a flow direction of a refrigerant flowing in a heat sink in which a dimple portion is formed according to a modified example of the present invention.
[63]
Referring to FIG. 10 , a dimple part 360 may be formed on the surface of the flow path part 340 . The cooling performance of the battery module can be improved by controlling the flow of the refrigerant through the dimple part 360 to minimize the cooling temperature deviation between parts of the flow path part 340 . Specifically, the dimple part 360 may be formed of a plurality of dimples formed in a hemispherical shape convex upward from the surface of the flow path part 340 . In other words, when the battery module is viewed from the bottom up, the lower surface of the heat sink 300 may have a concave shape. The plurality of dimples may be formed to be spaced apart from each other. Accordingly, as shown in FIG. 10 , the refrigerant flows evenly while passing between the dimple portions 360 formed of a plurality of dimples, so that cooling performance indicators such as maximum cooling temperature, temperature deviation, and thermal resistance can be improved. .
[64]
11 and 12 illustrate the heat sink in which the partition wall is formed.
[65]
11 is a view illustrating a direction in which a refrigerant flows in a heat sink having a partition wall formed thereon according to a modified example of the present invention. 12 is a view showing a direction in which a refrigerant flows in a heat sink in which a partition wall is formed according to a modified example of the present invention.
[66]
4, 11 and 12 , the flow path part 340 may further include a partition wall 350 formed inside the flow path part 340 along the direction in which the flow path part 340 is formed. The barrier rib 350 according to this modified example reduces the width of the flow path part 340 without changing the flow path length of the flow path part 340 to minimize the pressure drop and at the same time reduce the temperature deviation between the flow path widths. The upper end of the partition wall 350 and the upper end of the cooling plate 310 may be coupled to the lower surface of the module frame 205 by welding or the like.
[67]
By the partition wall 350 , the pressure drop and temperature deviation of the flowing refrigerant can be minimized, and in addition to the cooling plate 310 , the partition wall 350 is also combined with the bottom of the module frame 205 to form the module frame 205 . ) and support the load of the battery cell stack accommodated in the module frame 205 and may have the effect of reinforcing the rigidity of the battery module.
[68]
The partition wall 350 may extend from the inlet 320 to the outlet 330 along a central portion of the flow path 340 . Through this, the refrigerant introduced into the inlet 320 may be guided to the outlet 330 along the partition wall 350 .
[69]
The starting point of the partition wall 350 is formed to be spaced apart from the inlet 320 , and the refrigerant introduced through the inlet 320 flows from the starting point of the partition wall 350 to the first flow path part 341 and the second flow path formed through the partition wall 350 . It can flow by being divided into two flow passages 342 . In this case, the widths of the first flow path part 341 and the second flow path part 342 are formed to be the same, and the widths of the first flow path part 341 and the second flow path part 342 are from the inlet 320 to the outlet 340 . ) can be consistently formed. Accordingly, the flow may not be biased toward any one of the first and second flow passages 341 and 342 , and a flow passage that may occur due to a wider width of one of the first and second flow passages 341 and 342 . It is possible to minimize the difference in temperature difference between each. In addition, since the widths of the flow passages 340 are formed uniformly, the possibility of pressure drop and temperature deviation that may occur when the width is increased or decreased can be minimized.
[70]
According to this modification, as shown in FIG. 11 , the refrigerant flows through the first and second flow passages 341 and 342 formed based on the partition wall 350 , and the flow path of the first flow passage 341 . is parallel to the stacking direction of the 1-1 path set (I1) and the battery cell stack 100, which collects the first 1-1 paths 341a formed in a direction perpendicular to the stacking direction of the battery cell stack 100 The 2-1 path set II1 may include a collection of 2-1 paths 341b formed in one direction. In addition, the flow path of the second flow path part 342 includes the first 1-2 path set I2 and the battery in which the 1-2 paths 342a formed in a direction perpendicular to the stacking direction of the battery cell stack 100 are collected. A 2-2 path set II2 may include a collection of 2-2 paths 342b formed in a direction parallel to the stacking direction of the cell stack 100 .
[71]
In this case, the total length of the first path set (I) is the sum of the total length of the 1-1 path set (I1) and the total length of the 1-2 path set (I2), and the second path set (II) The total length of is the sum of the total length of the 2-1 path set (II1) and the total length of the 2-2 path set (II2), and the total length of the second path set (II) is the total length of the first path set ( It may be formed longer than the total length of I). Through this, a path through which the refrigerant flows across the plurality of battery cells is formed to be longer than a path that flows parallel to the longitudinal direction of the plurality of battery cells, thereby reducing the temperature deviation between the battery cells and improving the cooling performance. .
[72]
At this time, the partition wall 350 can also be divided into a portion formed in the direction formed by the paths constituting the first path set (I) and a portion formed in the direction formed by the paths constituting the second path set (II). The total length of the portions formed in the direction formed by the paths constituting the second path set II may be longer than the total length of the portions formed in the direction formed by the paths constituting the first path set I. .
[73]
Portions of the barrier rib 350 formed in a direction in which the paths constituting the second path set II are formed are formed in a direction crossing the lower side of the plurality of battery cells of the battery cell stack, so that the load of the plurality of battery cells is reduced. can be effectively supported.
[74]
FIG. 12 is a view showing a modified example of a heat sink in which a barrier rib having a structure different from that of FIG. 11 is formed.
[75]
Referring to FIG. 12 , at least one of the second paths 341b and 342b forming the second path set II may be formed to pass under all of the plurality of battery cells forming the battery cell stack. . In addition, the total length of the paths formed in the direction crossing the plurality of battery cells is longer than the total length of the paths formed in the direction parallel to the plurality of battery cells among the paths formed in the flow passages flowing through the modified barrier rib structure. It is possible to implement a flow path and a bulkhead groove having various modifications.
[76]
The battery module described above may be included in the battery pack. The battery pack may have a structure in which one or more battery modules according to the present embodiment are collected and packed by adding a battery management system (BMS) that manages the temperature or voltage of the batteries and a cooling device.
[77]
The battery pack may be applied to various devices. Such a device may be applied to transportation means such as an electric bicycle, an electric vehicle, and a hybrid vehicle, but the present invention is not limited thereto and can be applied to various devices that can use a battery module, which also falls within the scope of the present invention .
[78]
In the above, preferred embodiments of the present invention have been illustrated and described, but the present invention is not limited to the specific embodiments described above, and it is common in the technical field to which the present invention pertains without departing from the gist of the present invention as claimed in the claims. Various modifications may be made by those having the knowledge of, of course, and these modifications should not be individually understood from the technical spirit or perspective of the present invention.
[79]
Explanation of symbols
[80]
205: module frame 210: lower frame
[81]
220: top plate 230: end plate
[82]
300: heat sink 310: cooling plate
[83]
320: inlet 330: outlet
[84]
340: flow passage 340a: first path
[85]
340b: second path 341: first flow path
[86]
341a: 1-1 path 341b: 1-2 path
[87]
342: second flow path 342a: 2-1 route
[88]
342b: second-second path 343: first sidewall portion
[89]
344: second side wall part 350: bulkhead
[90]
360: dimple part I: first path set
[91]
I1: 1-1 path set I2: 1-2 path set
[92]
II: second path set II1: 2-1 path set
[93]
II2: 2-2 path set
Claims
[Claim 1]
a battery cell stack in which a plurality of battery cells are stacked; a module frame for accommodating the battery cell stack; and a heat sink formed under the module frame to cool the plurality of battery cells, wherein the heat sink includes a lower plate and a flow path that is a flow path of the refrigerant, and the flow path of the flow path includes the battery a first path set in which first paths formed in a direction perpendicular to a stacking direction of the cell stack are collected; and a second path set collecting second paths formed in a direction parallel to the stacking direction of the battery cell stack, wherein the total length of the second path set is longer than the total length of the first path set. module.
[Claim 2]
The battery module of claim 1, wherein the second paths forming the second set of paths are formed to pass under at least two or more of the plurality of battery cells forming the battery cell stack.
[Claim 3]
The battery module of claim 1, wherein at least one of the second paths forming the second path set passes under all of the plurality of battery cells forming the battery cell stack.
[Claim 4]
The battery module of claim 1 , wherein the heat sink further includes an inlet through which the refrigerant flows and an outlet through which the refrigerant flows, wherein both the inlet and the outlet are formed on one side of the heat sink.
[Claim 5]
The battery module of claim 4, wherein the paths connected to the inlet and the outlet are all first paths.
[Claim 6]
The battery module of claim 1 , wherein the flow path part further comprises a partition wall formed inside the flow path part along a direction in which the flow path part is formed.
[Claim 7]
The method of claim 6, wherein the refrigerant flows divided into first and second flow passages formed based on the partition wall, and the flow path of the first flow passage is formed in a direction perpendicular to the stacking direction of the battery cell stack. a 1-1 path set of 1 paths; and a 2-1 path set that collects 2-1 paths formed in a direction parallel to the stacking direction of the battery cell stack, wherein the flow path of the second flow path includes a stacking direction of the battery cell stack and The first and second paths formed in the vertical direction may include a set of first and second paths; and a 2-2 path set that collects 2-2 paths formed in a direction parallel to the stacking direction of the battery cell stack, wherein the total length of the first path set is the total length of the 1-1 path set. The length is the sum of the length and the total length of the 1-2 path set, and the total length of the second path set is the length obtained by adding the total length of the 2-1 path set and the total length of the 2-2 path set. and the total length of the second set of paths is longer than the total length of the first set of paths.
[Claim 8]
The battery module of claim 1, wherein the flow passage further includes sidewalls forming both side surfaces.
[Claim 9]
The method of claim 8, wherein the side wall portion, A first side wall portion formed in a direction perpendicular to the stacking direction of the battery cell stack; and a second sidewall portion formed in a direction parallel to the stacking direction of the battery cell stack, wherein the total length of the second sidewall portion is longer than the total length of the first sidewall portion.
[Claim 10]
The battery module of claim 1 , wherein a dimple part is formed on a surface of the flow path part.
[Claim 11]
The method of claim 1, wherein the flow path part is formed in a structure recessed downwardly from the lower plate, and an upper side of the flow path part is covered by the bottom part of the module frame, and is formed into a space between the flow path part and the bottom part of the module frame. A battery module in which the refrigerant flows.
[Claim 12]
A battery pack comprising the battery module according to claim 1 .