Title of invention: heat sink
technical field
[One]
This application claims the benefit of priority based on Korean Patent Application No. 10-2020-0065214 dated May 29, 2020, and all contents disclosed in the literature of the Korean patent application are incorporated as a part of this specification.
[2]
The present invention relates to a secondary battery module on which a plurality of secondary batteries are mounted or a heat sink mounted on a secondary battery pack in which a plurality of secondary battery modules are coupled, and more particularly, has a structure more robust to external shocks, and It relates to a heat sink for mounting a secondary battery module or secondary battery pack capable of increasing cooling performance by improving a flow path.
[3]
background
[4]
The secondary battery has a structure in which an electrode assembly in which a positive electrode, a separator, and a negative electrode are repeatedly stacked and an electrolyte solution are built in a case, and is manufactured in a structure that can be repeatedly charged and discharged by an electrochemical reaction between the components.
[5]
The secondary battery module is manufactured by combining a plurality of secondary batteries and mounted on a dedicated frame or case to protect each secondary battery from external shock, heat, vibration, and the like. The frame or case may optionally be equipped with a cooling device.
[6]
In addition, the secondary battery pack is finally mounted on an electric vehicle or a large-capacity electric storage device, and is configured by combining a plurality of secondary battery modules. This secondary battery pack has a structure in which a battery management system (BMS), a cooling device, and a protection and control system are additionally mounted in addition to the secondary battery module.
[7]
The secondary battery inevitably generates heat as an electrochemical reaction occurs during charging or discharging. Such heat interferes with the electrochemical reaction to deteriorate performance, and if heat accumulation continues, it may cause malfunction or malfunction of the secondary battery, and in severe cases may even cause ignition.
[8]
However, since the secondary battery module and the secondary battery pack have a structure in which a plurality of secondary batteries are densely installed in a narrow space, it is very important to efficiently cool the heat generated from each.
[9]
Accordingly, it is essential to mount a cooling device in a high-output, large-capacity secondary battery module and/or a secondary battery pack in which the secondary battery pack is mounted.
[10]
Such a cooling device may be equipped with an air-cooled cooling device composed of a heat sink and a cooling fan depending on the size and capacity. However, when the amount of heat is relatively high, a water-cooled cooling device that exchanges heat with cooling water is mounted.
[11]
There are also several types of water-cooled cooling devices, but among them, the heat sink type is mounted in a form coupled to the lower portion (or upper portion in some cases) of the pack tray 6 on which the plurality of secondary batteries 7 are seated.
[12]
That is, as shown in FIG. 1 showing a state in which the conventional heat sink 1 is mounted and the heat sink 1 is removed, a plurality of secondary batteries 7 are placed above the pack tray 6 . When this is mounted, the heat sink 1 is mounted on the lower side of the pact tray 6 .
[13]
The heat sink 1 has a plate shape, but one side has a concave shape, so that when it is attached to the flat surface of the pack tray 6, a closed space with a predetermined size is formed therein. This sealed space forms a chamber 3 through which the cooling water flows, and an inlet 4 is formed as an inlet through which low-temperature cooling water is introduced at one side and the other side of the heat sink 1, and the high-temperature cooling water subjected to heat exchange is discharged. It has a structure in which the outlet 5 is formed as an outlet.
[14]
In addition, the chamber 3 has a structure in which dimples 2 convexly protrude into the chamber 3 to form a flow path of the coolant. In addition, as shown in FIG. 1 , these dimples have a structure in which both sides are symmetrical and the distance between neighboring dimples 2 is constant so that heat exchange can be performed equally with each of the secondary batteries on the upper side of the pack tray 6 . it was common
[15]
However, this structure has a problem in that when an impact or load is applied from the outside, the bearing capacity is lowered in the direction in which the dimples 2 are formed. In particular, when mounted on a vehicle, deformation may occur due to continuous vibration and centrifugal force generated during driving.
[16]
DETAILED DESCRIPTION OF THE INVENTION
technical challenge
[17]
Therefore, the present invention more effectively prevents deformation due to a load applied in a specific direction, has stronger durability against continuous shock and vibration, and a heat for mounting a secondary battery module or secondary battery pack capable of uniform heat exchange of cooling water The main purpose is to provide a sink.
[18]
means of solving the problem
[19]
The present invention for achieving the above object is a heat sink coupled to a pack tray on which a plurality of secondary batteries are mounted and having an inlet and an outlet to allow coolant to enter and exit the chamber, and to form a flow path of the coolant. Including, dimples protruding convexly inward, wherein a plurality of dimples are disposed to be spaced apart from each other, and the spacing between neighboring dimples in a specific region and the spacing between neighboring dimples in another region are different from each other do it with
[20]
The heat sink has a rectangular plate shape having two long sides having a relatively long length and two short sides having a relatively short length, and the inlet and the outlet are each other at a short side of one of the short sides having a relatively short length. It is arranged so as to be positioned at opposite ends.
[21]
The dimples are arranged with a higher density as they are closer to the inlets and outlets, and have a lower density as they are farther from the inlets and outlets.
[22]
The dimples are arranged closer to the long side as they are closer to the inlet and the outlet along the longitudinal direction of the long side, and are arranged farther from the long side as they are farther from the inlet and the outlet.
[23]
The dimples are formed in a circular shape, and are formed in a circular shape having the same diameter.
[24]
The heat sink is formed with a through-hole having a through-hole penetrating the inside of the chamber in a thickness direction. The through portion protrudes from the surface of the heat sink and has a support portion in close contact with the heat sink when coupled to one side of the pack tray, and a through hole is formed in the support portion.
[25]
The through portions are disposed on an imaginary line connecting the middle points of the short sides of both sides, and a plurality of the through portions are disposed to be spaced apart from each other in the longitudinal direction of the long side.
[26]
In addition, one of the surfaces of the inlet and the outlet opening into the chamber is formed as an inclined surface, so that the cross-sectional area increases in a direction closer to the chamber.
[27]
Effects of the Invention
[28]
The present invention having the above-described configuration can prevent deformation and bending in a specific direction as the spacing between the dimples is formed differently.
[29]
The dimples are arranged with a higher density as they are closer to the inlets and outlets, and have a lower density as they are farther from the inlets and outlets. Accordingly, as the distance from the inlet and outlet increases, the flow path of the coolant becomes simpler, so that flow rate distribution and heat exchange can be performed evenly throughout the heat sink.
[30]
The dimples are arranged closer to the long side as they are closer to the inlet and outlet along the longitudinal direction of the long side, and are arranged farther from the long side as they are further away from the inlet and outlet. It is possible to quickly reach the short side opposite to the short side where the inlet and outlet are located.
[31]
The plurality of dimples may be formed in a circular shape having the same diameter. Accordingly, it is possible to suppress or minimize the formation of a vortex due to an irregular flow when the cooling water flows.
[32]
The heat sink is formed with a through-hole having a through-hole penetrating the inside of the chamber in a thickness direction. Accordingly, it is possible to pass through the through hole a wiring connected to the coupling device of the heat sink or the secondary battery. When the coupling device for fixing the heat sink to the pack tray is coupled through the through hole, the heat sink may be coupled more strongly because a fastening force is generated even at an intermediate position of the heat sink.
[33]
One of the surfaces of the inlet and the outlet opening into the chamber is formed as an inclined surface, and thus the cross-sectional area increases in a direction closer to the chamber.
[34]
Brief description of the drawing
[35]
1 is a view showing a state in which a conventional heat sink is coupled to a lower part of a pack tray of a secondary battery module and a state in which the heat sink is removed;
[36]
2 is a view showing a state in which a heat sink according to the present invention is coupled to a lower part of a pack tray of a secondary battery module and a state in which the heat sink is removed;
[37]
3 is a plan view of a heat sink according to the present invention;
[38]
FIG. 4 is an enlarged view of a portion A and an enlarged view of a portion B in FIG. 3 .
[39]
5 is a view showing a partially enlarged state in a plan view of the heat sink according to the present invention.
[40]
Modes for carrying out the invention
[41]
Hereinafter, based on the accompanying drawings, the present invention will be described in detail so that those of ordinary skill in the art can easily carry out the present invention. However, the present invention may be embodied in several different forms and is not limited to the embodiments described herein.
[42]
In order to clearly explain the present invention, parts irrelevant to the description are omitted, and the same reference numerals are assigned to the same or similar elements throughout the specification.
[43]
In addition, the terms or words used in the present specification and claims should not be construed as being limited to conventional or dictionary meanings, and the inventor appropriately defines the concept of the term in order to best describe his invention. It should be interpreted as meaning and concept consistent with the technical idea of ​​the present invention based on the principle that it can be done.
[44]
In the present invention for achieving the above object, when a plurality of secondary batteries 7 are coupled to one side of the pack tray 6, one side is closed, and the inlet and the outlet so that the coolant enters and exits the inner chamber A preferred embodiment of the present invention will be described in more detail below with reference to the accompanying drawings as to a heat sink having a
[45]
FIG. 2 is a state in which a heat sink according to the present invention is coupled to a lower part of a pack tray of a secondary battery module and a state in which the heat sink is removed, and FIG. 3 is a plan view of the heat sink according to the present invention. 4 is an enlarged view of a part A and an enlarged view of a part B in FIG. 3 , and FIG. 5 is an enlarged view of a part of the heat sink according to the present invention in a plan view.
[46]
Referring to the accompanying drawings, the heat sink 10 of the present invention has a space in which the coolant can circulate therein, and when it is coupled to one side of the pack tray, one side is closed or a secondary battery is combined with a separate flat plate. It has a plate shape concave on one side to be mounted between the field and the pact tray.
[47]
That is, in the present invention, the heat sink 10 is coupled to the pack tray, and the opening surface is coupled to the bottom surface of the pack tray 6 so that the opening surface is closed, or the opening surface is closed through a separate plate. It has a structure that can be coupled to the pack tray (6). The heat sink 10 may be coupled to a pack tray and a separate flat plate through brazing or an adhesive.
[48]
Accordingly, one surface protrudes convexly and the other surface is closed to the bottom surface of a separate flat plate or pack tray, so that a space in which the coolant can circulate is formed in the chamber 11 . In addition, an inlet 13 through which the cooling water is introduced and an outlet 14 through which the cooling water is discharged are formed in the heat sink 10 so as to be opened with the chamber 11 .
[49]
The inlet 13 and the outlet 14 are provided in the form of a hole or groove through which the coolant can enter and exit from the heat sink 10, and are connected to an external cooling device that supplies and recovers coolant through a hose or pipe. .
[50]
In the present invention, the heat sink 10 has a rectangular plate shape having two long sides (L) having a relatively long length and two short sides (S) having a relatively short length, the inlet 13 and the outlet (14) is disposed so as to be positioned at opposite ends of one of the short sides (S) having a relatively short length (S).
[51]
A plurality of dimples 12 convexly protrude from one surface of the heat sink 10 so as to be located inside the chamber 11 .
[52]
The dimples 12 block the flow of the coolant in the chamber 11 to form a flow path of the coolant.
[53]
The dimples 12 are formed in a circular shape, and are formed in a circular shape having the same diameter. In addition, the dimples 12 are spaced apart from each other, and the interval g1 between the dimples 12 neighboring in a specific area and the interval g2 between the dimples 12 neighboring in the other area g2 may be configured to be arranged differently from each other.
[54]
The dimples 12 are arranged with a higher density as they are closer to the inlet 13 and the outlet 14 , and have a lower density as they are farther from the inlet 13 and the outlet 14 .
[55]
That is, as shown in FIG. 4 showing enlarged points A and B of FIG. 3 , the gap g1 between the inlet 13 and the outlet 14 and the dimples 12 disposed near the side is relatively small. is formed, and the gap g2 between the inlet 13 and the outlet 14 and the dimples 12 disposed on the far side is formed to be relatively large. For reference, although the dimples 12 are illustrated as having a circular shape of the same size, a configuration in which the dimples 12 have different diameters to form different intervals is also possible. In addition, the dimples 12 may have various shapes and combinations of various sizes, such as an ellipse, a polygon, and an irregular figure, in addition to a circle. Such a combination may be determined in consideration of the bending rigidity of the heat sink 10 and the flow of cooling water.
[56]
In addition, as shown in FIG. 5 , the dimple 12 is disposed closer to the long side L as it is closer to the inlet 13 and the outlet 14 along the longitudinal direction of the long side L, and the inlet 13 And the farther away from the outlet 14, the farther away from the long side (L) is arranged. That is, the length of ② gradually increases from l 1 to l 2 as it goes to the right based on the direction indicated by ① .
[57]
Accordingly, when the coolant is discharged from the inlet 13, the cross-sectional area that can flow gradually increases as the distance increases.
[58]
On the other hand, the secondary battery module or pack is equipped with such a heat sink 10 as well as various cables and fixing devices for fixing the heat sink 10 . Accordingly, in the heat sink 10 according to the present invention, a through hole 15a is formed along the thickness direction to penetrate the heat sink 10 so that an accessory such as a cable can be mounted therethrough through the heat sink 10 . .
[59]
The through portion 15 in which the through hole 15a is formed has a support portion 15b that protrudes from the surface of the heat sink 10 and is in close contact when the heat sink 10 is coupled to one side of the pack tray. , a through hole 15a is formed in the support portion 15b.
[60]
The support portion 15b protrudes from the surface of the heat sink 10 inside the chamber 11, and the protruding end is formed at a height that can be in close contact with the bottom surface or flat plate of the pack tray that closes the heat sink 10. do.
[61]
For reference, a sealing material such as a rubber gasket (not shown) may be added to the support portion 15b to prevent leakage of coolant when it is in close contact with the bottom surface or flat plate of the pack tray.
[62]
The through portions 15 are arranged on a virtual line connecting the middle points of the short sides S on both sides, and a plurality of the through portions 15 are spaced apart from each other in the longitudinal direction of the long side L. That is, as shown in the drawing, the through portion 15 may be disposed along a center between the two long sides L, which is parallel to the long sides.
[63]
In addition, one of the surfaces of the inlet 13 and the outlet 14 opened to the chamber 11 is formed as an inclined surface, so that the cross-sectional area increases in a direction closer to the chamber.
[64]
The present invention having the configuration as described above can prevent deformation and bending in a specific direction as the spacing between the dimples 12 is formed differently.
[65]
The dimple 12 has a higher density as it approaches the inlet 13 and the outlet 14 , and has a lower density as it moves away from the inlet 13 and the outlet 14 . Accordingly, as the distance from the inlet 13 and the outlet 14 increases, the flow path of the cooling water becomes simpler, so that flow rate distribution and heat exchange can be performed evenly throughout the heat sink 10 .
[66]
The dimple 12 is disposed closer to the long side L as it is closer to the inlet 13 and the outlet 14 along the longitudinal direction of the long side L, and as the distance from the inlet 13 and the outlet 14 increases, the dimple 12 is disposed closer to the long side L. Since it is disposed farther from the long side (L), the cross-sectional area of ​​the flow path increases as the distance from the inlet (13) and outlet (14) increases, so that the short side opposite to the short side (S) where the inlet (13) and outlet (14) are located can reach
[67]
The plurality of dimples 12 may be formed in a circular shape having the same diameter. Accordingly, it is possible to suppress or minimize the formation of a vortex due to an irregular flow when the cooling water flows.
[68]
The heat sink 10 is formed with a through-hole having a through-hole 15a penetrating the inside of the chamber along the thickness direction. Accordingly, the coupling device of the heat sink 10 or a wiring connected to the secondary battery may pass through the through hole 15a. When the coupling device for fixing the heat sink 10 to the pack tray is coupled through the through hole 15a, the heat sink may be coupled more strongly because a coupling force is generated even at an intermediate position of the heat sink.
[69]
One of the surfaces of the inlet and the outlet opening into the chamber is formed as inclined surfaces 13a and 14a, and thus the cross-sectional area increases in a direction closer to the chamber.
[70]
Although the present invention has been described with reference to limited examples and drawings, the present invention is not limited thereto, and it is described below with the technical idea of ​​the present invention by those of ordinary skill in the art to which the present invention pertains. Various implementations are possible within the scope of equivalents of the claims to be made.
[71]
[72]
[Explanation of code]
[73]
10: heat sink
[74]
11: chamber
[75]
12 : dimple
[76]
13: inlet
[77]
14: Outlet
[78]
15: penetrating part
Claims
[Claim 1]
A heat sink coupled to a pack tray on which a plurality of secondary batteries are mounted and having an inlet and an outlet for cooling water to and from the inner chamber, and a dimple convexly protruding into the chamber to form a flow path of the coolant; The heat sink, characterized in that the plurality of dimples are spaced apart from each other, and the spacing between neighboring dimples in a specific region and the spacing between neighboring dimples in another region are different from each other.
[Claim 2]
The heat sink according to claim 1, wherein the heat sink has a rectangular plate shape having two long sides having a relatively long length and two short sides having a relatively short length, and the inlet and the outlet have short sides having relatively short lengths. A heat sink, characterized in that it is disposed at the opposite ends of one of the short sides.
[Claim 3]
The heat sink according to claim 2, wherein the dimples have a higher density as they are closer to the inlets and outlets, and have a lower density as they move away from the inlets and outlets.
[Claim 4]
The heat sink according to claim 3, wherein the dimples are arranged closer to the long side as they are closer to the inlet and the outlet along the longitudinal direction of the long side, and are arranged farther from the long side as they are farther from the inlet and the outlet.
[Claim 5]
The heat sink according to claim 1, wherein the dimples are formed in a circular shape.
[Claim 6]
The heat sink according to claim 5, wherein the dimples are formed in a circular shape having the same diameter.
[Claim 7]
The heat sink according to claim 2, wherein the heat sink has a through portion having a through hole penetrating the inside of the chamber in a thickness direction.
[Claim 8]
The heat sink according to claim 7, wherein the through portion protrudes from the surface of the heat sink and has a support portion that is closely contacted when the heat sink is coupled to one side of the pack tray, and a through hole is formed in the support portion. .
[Claim 9]
The heat sink according to claim 8, wherein the penetrating portion is disposed on an imaginary line connecting the middle points of both short sides and a plurality of the through portions are spaced apart along the longitudinal direction of the long side.
[Claim 10]
[10] The heat according to any one of claims 1 to 9, wherein one of the surfaces opening into the chamber of the inlet and the outlet is formed as an inclined surface, and the cross-sectional area increases in a direction closer to the chamber. sink.