WO2020141686A1

WO2020141686A1 - Heat exchanger for cooling battery

Info

Publication number: WO2020141686A1
Application number: PCT/KR2019/010972
Authority: WO
Inventors: 김영일; 채관교; 정규영; 김정희
Original assignee: 주식회사 고산
Priority date: 2018-12-31
Filing date: 2019-08-28
Publication date: 2020-07-09
Also published as: KR20200082567A; KR102210929B1

Abstract

A heat exchanger for cooling a battery according to the present invention, which is a heat exchanger for cooling a battery installed to be in contact with a battery of a vehicle, comprises: a first header portion to which an inflow pipe through which a cooling fluid flows is connected, and having a plurality of first insertion holes; a second header portion having a plurality of second insertion holes facing the plurality of first insertion holes; and a plurality of cooling portions of which both ends are fixed by being inserted into the plurality of first insertion holes and the plurality of second insertion holes, and in which a plurality of flow paths through which the cooling fluid flows are formed in the longitudinal direction. The heat exchanger for cooling a battery has an advantage in that various flow paths can be formed depending on the installation position and length of a plurality of baffles, the position of at least one through hole formed in a separation wall, and the installation position and length of a partition wall.

Description

Heat exchanger for battery cooling

The present invention relates to a heat exchanger for cooling the battery, specifically, to an optimal flow path according to the heat distribution of the battery, and to a heat exchanger for cooling the battery with low pressure loss.

In general, eco-friendly vehicles such as electric vehicles and hybrid vehicles are made of a plurality of lithium-ion cells to supply electric energy, and rechargeable batteries are applied.

All types of batteries generate high-temperature heat due to electrochemical processes during charging and discharging. When heat accumulates in the battery, performance and lifespan decrease, and in severe cases, it can lead to explosion and fire. It is essential for vehicles.

Most batteries must maintain a temperature range of 5°C to 30°C to ensure stable performance and longevity, and stable performance and longevity only when the temperature difference between cells in the same battery pack is within 5°C. Even outside the temperature range difference, it may cause a decrease in performance and life. That is, even if only one cell fails, the battery may cause the entire pack of the battery cells connected in series to fail.

Therefore, in order to increase the life of the heat exchanger for cooling the battery, a structure in which the entire battery pack is cooled is more efficient than a structure in which several cells are intensively cooled.

The conventionally developed press type battery heat exchanger for cooling a cooling fluid may have a relatively wide flow path, but by applying a brazing technology, a large bonding area is required to join the upper and lower plates, thereby extruding. There is a problem in that the cooling area using convective heat transfer is smaller than that of the manufactured heat exchanger.

In order to overcome such a problem that the cooling area is narrow, the conventional press-type heat exchanger is forcibly forming turbulence by applying an irregularly banded heat exchange pipe, but such a press-type heat exchanger has a higher pressure loss and heat dissipation than an extruded heat exchanger. There is a disadvantage of low performance.

The present invention was devised to solve the above-mentioned conventional problems, and the object of the present invention is the installation position and length of a plurality of baffles, the position of at least one through hole formed in the separation wall, and the installation position and length of the partition wall. It is possible to form an optimal flow path according to the heat distribution of the battery by deforming and providing a heat exchanger for cooling the battery with low pressure loss.

The present invention for achieving the above object is a heat exchanger for cooling the battery is installed to contact the battery of the vehicle, the inlet pipe is connected to the cooling fluid is introduced, a first header portion formed with a plurality of first insertion hole; A second header portion formed with a plurality of second insertion holes facing the plurality of first insertion holes; And a plurality of cooling parts having both ends inserted into and fixed to the plurality of first insertion holes and the plurality of second insertion holes, and a plurality of flow passages through which the cooling fluid flows are formed in a longitudinal direction. Provide a heat exchanger.

Here, the first header portion and the second header portion are installed at predetermined intervals along the longitudinal direction in the inner space, and are characterized by including a plurality of baffles partitioning the inner space.

In addition, it is formed along the longitudinal direction of the first header portion, and further comprising a partition wall partitioning a space between a plurality of baffles provided in the first header portion, the partition wall facing the plurality of first insertion holes It characterized in that at least one through hole is formed.

In addition, at least one insertion hole is formed between the plurality of first insertion holes in the first header portion, and at least one coupling hole facing the at least one insertion hole is formed in the separation wall, and the at least one insertion hole is formed. And at least one partition wall to which both ends are inserted and fixed to the at least one coupling hole.

In addition, it is characterized in that it is disposed in the space between the plurality of cooling units, both side surfaces further include an auxiliary cooling unit contacting the plurality of cooling units.

In addition, at least one of the plurality of cooling units, one surface in contact with the battery includes a mounting portion extending in the width direction, and the mounting portion is characterized in that a plurality of mounting holes for mounting the battery are formed.

The heat exchanger for battery cooling according to the present invention is capable of forming various flow paths according to the installation position and length of a plurality of baffles, the position of at least one through hole formed in the separation wall, and the installation position and length of the partition wall. There is an effect that the pressure loss is not large compared to the type heat exchanger. That is, an optimal flow path can be easily formed by appropriately distributing a portion to be cooled and a portion to be cooled according to the heat distribution of the battery.

In addition, the heat exchanger for cooling the battery according to the present invention has an effect that the strength is reinforced by the separation wall and the partition wall installed in the interior space. In addition, since it can be manufactured by extrusion molding, it is possible to reduce the mold development cost by about 76% compared to a press-type battery heat exchanger of the same size.

In addition, the heat exchanger for cooling the battery according to the present invention has an effect of expanding the area in contact with the battery module contact portion by filling the space between the plurality of cooling units by the auxiliary cooling unit, thereby expanding the cooling area.

1 is a perspective view of a heat exchanger for cooling a battery according to the present invention.

2 is an exploded perspective view of a heat exchanger for cooling a battery according to the present invention.

3 is an enlarged perspective view of part a of FIG. 2.

4 is a cross-sectional view showing a first header portion and a separation wall in a heat exchanger for cooling a battery according to the present invention.

5 is a plan view showing the flow of cooling fluid in the heat exchanger for cooling a battery according to the present invention.

6 is a view showing the flow analysis results when the cooling water flow rate of 5 LPM in a conventional press-type heat exchanger.

7 is a view showing the flow analysis result when the cooling water flow rate of 5 LPM in the heat exchanger for cooling the battery of the present invention.

8 is a view showing the flow analysis result when the cooling water flow rate is 16 LPM in a conventional press-type heat exchanger.

9 is a view showing the flow analysis result when the flow rate of the cooling water is 16 LPM in the heat exchanger for cooling the battery of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, it should be noted that in adding reference numerals to the components of each drawing, the same components have the same reference numerals as possible even though they are displayed on different drawings. In addition, when it is determined that the subject matter of the present invention may be obscured, the detailed description thereof will be omitted. In addition, although the embodiments of the present invention will be described below, the technical spirit of the present invention is not limited to or limited thereto, and can be practiced by those skilled in the art.

1 is a perspective view of a heat exchanger for cooling a battery according to the present invention, FIG. 2 is an exploded perspective view of a heat exchanger for cooling a battery according to the present invention, FIG. 3 is an enlarged perspective view of part a of FIG. 2, and FIG. 4 is In the heat exchanger for cooling a battery according to the present invention, a cross-sectional view showing a first header portion and a separation wall, and FIG. 5 is a plan view showing a flow of cooling fluid in a heat exchanger for cooling a battery according to the present invention.

Hereinafter, a heat exchanger 1 for cooling a battery according to a preferred embodiment of the present invention will be described with reference to FIGS. 1 to 5.

Referring to FIG. 1, the battery cooling heat exchanger 1 according to a preferred embodiment of the present invention is an extrusion type heat exchanger different from a conventional press type heat exchanger, and a battery module contact part of an eco-friendly vehicle such as an electric vehicle or a hybrid vehicle. (B) It is installed so as to be in contact with one surface to cool the battery module (not shown) mounted on the battery module contact portion (B), the first header portion 100, the second header portion 200 and a plurality of cooling portions It may be configured to include 300. Here, the battery module contact part B is a pad using a heat transfer material called a thermal interface material (TIM), and the battery module may be mounted.

Specifically, referring to FIG. 2, the first header portion 100 may have a pipe shape having a rectangular cross section, and an inlet hole 110 is formed on one surface to connect the inlet pipe 110 ′ through which cooling fluid flows. Can.

In addition, the first header portion 100 may be formed with a plurality of first insertion holes 120 in the form of long holes on a side surface orthogonal to one surface at predetermined intervals in the longitudinal direction.

On the other hand, the second header portion 200, like the first header portion 100, may have a pipe shape having a rectangular cross section, and an outlet hole 210 may be formed on one surface to connect the outlet pipe 210'.

Here, although not shown, the outlet pipe 210' may be configured to be connected to the first header portion 100 to form an optimal flow path according to the heat distribution of the battery. That is, the cooling fluid introduced through the inlet pipe 110' flows through a plurality of flow passages formed in a plurality of cooling parts 300 to be described later via the first header part 100, and then the first header part 100 or It may be discharged through the outlet pipe 210' connected to the second header portion 200.

Meanwhile, the second header portion 200 may be formed with a plurality of second insertion holes 220 in the form of a long hole on a side opposite to the first header portion 100 at predetermined intervals in the longitudinal direction.

In addition, each of the first header unit 100 and the second header unit 200 includes a plurality of first baffles 130 and a plurality of second baffles 230. The plurality of

baffles

130 and 230 are installed at predetermined intervals along the length direction in the inner spaces of the first header part 100 and the second header part 200, such that the first header part 100 and the second baffle are provided. It is provided to partition the inner space of the header portion 200.

Here, the first header portion 100 and the second header portion 200 may be formed with a plurality of first coupling holes 140 and a plurality of second coupling holes 240 at predetermined intervals along the length direction. have. The plurality of first coupling holes 140 formed in the first header portion 100 are fixed by inserting a plurality of first baffles 130, and a plurality of second coupling holes 240 formed in the second header portion 200 ) May be fixed by inserting a plurality of second baffles 230.

Both ends of the plurality of cooling units 300 may be fixed by being inserted into the plurality of first insertion holes 120 and the plurality of second insertion holes 220 by a predetermined length. Here, the plurality of cooling units 300 may include a first cooling unit 300a, a second cooling unit 300b, and a third cooling unit 300c, as illustrated in FIG. 2, but is not limited thereto. , The number of cooling units 300 installed in the first header unit 100 and the second header unit 200 may be changed by a person skilled in the art.

In addition, the plurality of cooling units 300 may have a plurality of flow paths through which the cooling fluid flowing through the inflow pipe 110' flows in the longitudinal direction. At this time, the plurality of flow paths may be formed by being partitioned through the plurality of partition walls 310 formed in the longitudinal direction.

On the other hand, at least one of the plurality of cooling units 300 includes a mounting portion 320 formed on one surface of the battery module contact portion B extending along the width direction.

Specifically, the mounting portion 320 is the first header portion 100 and the second first cooling portion 300a disposed on both sides in the width direction among the plurality of cooling portions 300 fixed to the second header portion 200 And it may be formed on one surface of the third cooling unit (300c).

The mounting part 320 is formed with a plurality of mounting holes 321 for mounting a battery of an eco-friendly vehicle. The conventional heat exchanger for cooling the battery 1 is fixed by using a separate case to mount the battery, or a'a'-shaped bracket is brazed to a specific location of the cooling unit to be joined. This method requires a separate mold of the bracket, and requires additional structures such as brazing fixtures to bond to the correct position, and there is a problem in that it is necessary to individually place the bracket in the bonding position.

On the other hand, according to the present invention, since a mounting hole 321 for mounting a battery is formed so that the mounting portion 320, which replaces the function of the bracket, is formed integrally with the cooling unit 300, a separate bracket is disposed at a bonding position. By eliminating the manufacturing process, manufacturing labor and manufacturing cost can be reduced, and the vehicle battery can be mounted at the correct position of the heat exchanger through the mounting hole 321 formed in the mounting unit 320.

In addition, the mounting portion 320 has an effect that the strength of supporting the battery is reinforced because one surface in contact with the battery is extended along the width direction, and the heat dissipation effect can also be increased because the conductive area of the battery heat is widened.

Meanwhile, the plurality of cooling units 300 may be made of aluminum, or extruded. In addition, the mounting hole 321 formed in the mounting part 320 may be formed by post-processing after manufacturing a plurality of cooling parts 300 by extrusion molding, and the method of forming the mounting hole 321 can be any number by those skilled in the art. you can change it.

Meanwhile, as illustrated in FIGS. 2 to 4, the dividing wall 400 is formed along the longitudinal direction of the first header portion 100, and the plurality of first baffles 130 installed in the first header portion 100 ).

In addition, the separation wall 400 is formed with at least one through hole 410 facing the plurality of first insertion holes 120.

Meanwhile, the separation wall 400 further includes at least one partition wall 420. The partition wall 420 has one end inserted into at least one insertion hole 150 formed in the first header portion 100 and the other end inserted into and fixed to at least one coupling hole 430 formed in the separation wall 400. Can be. Here, the insertion hole 150 is formed between the plurality of first insertion holes 120 formed in the first header portion 100, the coupling hole 430 may be formed at a position facing the insertion hole 150. have.

That is, as illustrated in FIG. 5, the cooling fluid introduced through the inlet pipe 110 ′ is at least one through hole 410 formed in the separation wall 400 via the inner space of the first header portion 100. ) To flow into the interior space of the separation wall 400.

Thereafter, the cooling fluid does not flow to the second cooling unit 300b and the third cooling unit 300c, which are blocked by the partition wall 420, but to the first cooling unit 300a through the first insertion hole 120. Will flow. The cooling fluid passing through the plurality of flow paths of the first cooling unit 300a flows into the inner space of the second header unit 200 through the second insertion hole 220.

The cooling fluid flowing into the inner space of the second header part 200 does not flow to the third cooling part 300c blocked by the second baffle 230 but does not flow to the second cooling part through the second insertion hole 220. 300b). Afterward, the flow direction of the cooling fluid is the same as the arrow direction shown in FIG. 3, and finally, the cooling fluid may be discharged through the outlet pipe 210 ′ connected to the second header part 200.

In this way, the battery cooling heat exchanger 1 of the present invention is the installation position and length of the plurality of baffles (130, 230), the position of at least one through hole 410 formed in the separation wall 400, the partition wall According to the installation position and length of the 420, there is an advantage that various flow paths can be formed. That is, an optimal flow path can be easily formed by appropriately distributing a portion to be cooled and a portion to be cooled according to the heat distribution of the battery.

In addition, the first header portion 100 has an effect that the strength is reinforced by the separation wall 400 and the partition wall 420 installed in the interior space. In addition, since the heat exchanger for battery cooling 1 of the present invention can be manufactured by extrusion molding, the mold development cost can be reduced by about 76% when compared to a press-type battery heat exchanger for the same size.

Meanwhile, referring to FIGS. 1 and 2 again, the auxiliary cooling unit 500 is disposed in a space between the plurality of cooling units 300, and both side surfaces 510 are provided to contact the plurality of cooling units 300. Can.

That is, the space between the plurality of cooling units 300 may be filled by the auxiliary cooling unit 500 by applying the auxiliary cooling unit 500 to the heat exchanger 1 for cooling the battery of the present invention. In addition, since the auxiliary cooling unit 500 disposed between the plurality of cooling units 300 also contacts one surface of the battery module contact unit B, as a result, the battery module contact unit B and the heat exchanger 1 of the present invention contact each other. The area is expanded, and thereby the cooling area is expanded.

In other words, the secondary cooling unit 500, since both sides 510 are in contact with the plurality of cooling units 300, the cooling air by the cooling fluid flowing through the plurality of cooling units 300 can be conducted, and the auxiliary cooling unit ( The cold air conducted to 500) is transferred to the battery module contact portion B in contact with the auxiliary cooling portion 500 to increase cooling efficiency.

Here, the auxiliary cooling unit 500 may have concave surfaces on both sides 510 corresponding to a plurality of cooling units 300 having a hemisphere shape, and due to this shape, a contact area with the plurality of cooling units 300 This can be widened. In addition, the auxiliary cooling unit 500 may be made of aluminum, like the plurality of cooling units 300, or may be manufactured by extrusion molding.

On the other hand, the auxiliary cooling unit 500 may be formed to open the lower surface, it can be easily assembled in the space between the plurality of cooling unit 300 in the form of a clip.

In addition, the lower surface of the plurality of cooling units 300 and the auxiliary cooling unit 500 may be provided with an insulating plate 600.

Hereinafter, the flow analysis results of the conventional press-type heat exchanger and the battery cooling heat exchanger of the present invention will be described with reference to FIGS. 6 to 9. 6 is a view showing a flow analysis result when the cooling water flow rate is 5 LPM in a conventional press-type heat exchanger, and FIG. 7 is a flow when the cooling water flow rate is 5 LPM in the heat exchanger for battery cooling of the present invention 8 is a diagram showing the analysis results, and FIG. 8 is a diagram showing the flow analysis result when the flow rate of the cooling water is 16 LPM in the conventional press-type heat exchanger, and FIG. 9 is the flow rate of the cooling water in the heat exchanger 1 for battery cooling of the present invention This is a diagram showing the results of flow analysis at 16 LPM. Here, the conditions of the flow analysis are shown in Table 1 below.

항목Item	내용Contents
냉각수 유량Coolant flow	5 LPM / 16 LPM5 LPM / 16 LPM
냉각수 입구 온도Coolant inlet temperature	20℃20℃
배터리 모듈 열량Battery module calories	390 W390 W

냉각수 유량Coolant flow	5 LPM5 LPM		16 LPM16 LPM
항목Item	종래Conventional	본 발명The present invention	종래Conventional	본 발명The present invention
냉각수 압력 강하Coolant pressure drop	0.05 bar0.05 bar	0.027 bar0.027 bar	0.304 bar0.304 bar	0.160 bar0.160 bar

According to the results of Table 2 and FIGS. 6 to 9, when the cooling water flow rates are 5 LPM and 16 LPM, the battery cooling heat exchanger of the present invention can confirm that the pressure drop of the cooling water is lower than that of the conventional press-type heat exchanger. . Therefore, the battery heat exchanger for cooling of the present invention is a conventional press-type heat exchanger even if a plurality of

baffles

130, 230, a separation wall 400, a partition wall 420, and the like are provided in various ways to increase heat dissipation performance. It can be seen that there is an effect that the pressure loss is not large because there is a margin for pressure drop compared to the group.

The preferred embodiments of the present invention have been described in detail above, but the technical scope of the present invention is not limited to the above-described embodiments and should be interpreted by the claims. At this time, those skilled in the art should consider that many modifications and variations are possible without departing from the scope of the present invention.

Claims

As a heat exchanger for cooling the battery installed to contact the battery of the vehicle,

A first header portion to which the inflow pipe through which the cooling fluid flows is connected, and a plurality of first insertion holes are formed;

A second header portion formed with a plurality of second insertion holes facing the plurality of first insertion holes; And

Heat exchanger for battery cooling, characterized in that both ends are inserted into and fixed to the plurality of first insertion holes and the plurality of second insertion holes, and a plurality of cooling passages through which the cooling fluid flows are formed in a longitudinal direction. group.
According to claim 1,

The first header portion and the second header portion,

A heat exchanger for battery cooling, which is installed at predetermined intervals along the longitudinal direction in the interior space, and includes a plurality of baffles partitioning the interior space.
According to claim 2,

It is formed along the longitudinal direction of the first header portion, and further includes a partition wall partitioning a space between a plurality of baffles installed in the first header portion,

The separation wall is a heat exchanger for cooling the battery, characterized in that at least one through hole facing the plurality of first insertion hole.
According to claim 3,

The first header portion is formed with at least one insertion hole between the plurality of first insertion holes,

The separation wall is formed with at least one coupling hole facing the at least one insertion hole,

The at least one insertion hole and the at least one coupling hole is inserted at both ends, the battery cooling heat exchanger further comprises at least one partition wall fixed.
According to claim 4,

A heat exchanger for battery cooling, which is disposed in a space between the plurality of cooling parts, and further includes an auxiliary cooling part having both sides contacting the plurality of cooling parts.
The method of claim 5,

At least one of the plurality of cooling units,

The one surface in contact with the battery includes a mounting portion extending along the width direction,

The mounting portion is a heat exchanger for cooling the battery, characterized in that a plurality of mounting holes are formed for mounting the battery.