Title of invention: battery module
Technical field
[One]
Cross-reference with related application(s)
[2]
This application claims the benefit of priority based on Korean Patent Application No. 10-2018-0111656 filed on September 18, 2018, and all contents disclosed in the documents of the Korean patent application are incorporated as part of this specification.
[3]
The present invention relates to a battery module, and more particularly, to a battery module including a water-cooled battery cooling device with improved temperature deviation.
Background
[4]
Secondary batteries having high ease of application according to product groups and having electrical characteristics, such as high energy density, are widely applied not only to portable devices, but also to battery vehicles or hybrid vehicles driven by an electric drive source, and power storage devices. Such a secondary battery is attracting attention as a new energy source for environmentally friendly and energy efficiency improvement in that it does not generate by-products from the use of energy as well as the primary advantage that it can dramatically reduce the use of fossil fuels.
[5]
A battery pack applied to the battery vehicle has a structure in which a plurality of cell assemblies including a plurality of unit cells are connected in series in order to obtain high output. In addition, the unit cell may be repeatedly charged and discharged by an electrochemical reaction between constituent elements including a positive electrode and a negative electrode current collector, a separator, an active material, and an electrolyte.
[6]
Meanwhile, as the need for a large-capacity structure, including use as an energy storage source, is increasing in recent years, there is an increasing demand for a multi-module structure battery pack in which a plurality of secondary batteries are assembled in series and/or in parallel. .
[7]
Since a battery pack having a multi-module structure is manufactured in a form in which a plurality of secondary batteries are concentrated in a narrow space, it is important to easily dissipate heat generated from each secondary battery. As one of various methods of dissipating heat generated from a secondary battery, Korean Patent Laid-Open Publication No. 10-2013-0062056 discloses a cooling method using cooling water.
[8]
1 is a configuration diagram in which a cooling passage according to the prior art is arranged.
[9]
Referring to FIG. 1, a cooling passage 10 for cooling a secondary battery is shown. The refrigerant flowing through the cooling passage 10 enters the inlet 11 and exits through the outlet 12. In the cooling passage 10 having the structure as described above, there is a problem that the side closer to the inlet 11 side is cooled more and the side closer to the outlet 12 side is cooled less. That is, there is a problem in that the cooling water temperature increases as the temperature of the cooling water increases as the distance from the inlet 11 and the closer to the outlet 12 decreases the cooling efficiency.
[10]
The problem of the prior art as described above causes temperature variation of the secondary battery, and the temperature variation of the secondary battery leads to a performance variation of the secondary battery. Eventually, it leads to deterioration of system performance, such as battery packs including secondary batteries. Therefore, it is necessary to design a cooling channel that can produce a uniform cooling effect.
Detailed description of the invention
Technical challenge
[11]
The problem to be solved by the present invention is to provide a battery module exhibiting uniform cooling performance.
[12]
However, the problems to be solved by the embodiments of the present invention are not limited to the above-described problems, and may be variously expanded within the scope of the technical idea included in the present invention.
Means of solving the task
[13]
A battery module according to an embodiment of the present invention includes a battery cell stack including a plurality of battery cells stacked in one direction, cooling fins interposed between the battery cells, and a first cooling manifold connected to the cooling fins, and Including a second cooling manifold, the cooling fins include a first cooling fin having a first inlet and a first outlet and a second cooling fin having a second inlet and a second outlet, the first inlet and the A second outlet is connected to the first cooling manifold, and the second inlet and the first outlet are connected to the second cooling manifold.
[14]
Each of the first cooling manifold and the second cooling manifold may be divided into two regions.
[15]
The two regions are formed of an inlet manifold and an outlet manifold, the first inlet is connected to the inlet manifold of the first cooling manifold, and the first outlet is a discharge manifold of the second cooling manifold. The second inlet may be connected to an inlet manifold of the second cooling manifold, and the second outlet may be connected to a discharge manifold of the first cooling manifold.
[16]
Each of the first inlet, the first outlet, the second inlet and the second outlet may have a bent portion.
[17]
Each of the first cooling manifold and the second cooling manifold may extend along a stacking direction of the battery cell stack.
[18]
The cooling fin may include a heat sink and a refrigerant pipe formed at an edge of the heat sink.
[19]
The first inlet and the first outlet may be positioned at both ends of the refrigerant pipe, respectively.
[20]
The cooling fin may include a heat sink and a refrigerant pipe formed inside the heat sink.
[21]
The refrigerant pipe may have a zigzag structure while overlapping a surface of the battery cell facing the stacking direction of the battery cell stack.
[22]
The battery module may further include a buffer member interposed between the battery cells.
[23]
A battery module according to another embodiment of the present invention includes a battery cell stack including a plurality of battery cells stacked in one direction, cooling fins interposed between the battery cells and having an inlet and an outlet, and connected to the cooling fins. Including a first cooling manifold and a second cooling manifold, each of the first cooling manifold and the second cooling manifold is connected to the inlet and the outlet, the first cooling manifold and the second cooling In each of the manifolds, the inlet and the outlet are alternately arranged with each other.
[24]
Each of the first cooling manifold and the second cooling manifold is divided into two regions, and the inlet and the outlet connected to the first cooling manifold are connected to different regions of the two regions, The inlet port and the outlet port connected to the second cooling manifold may be connected to different areas of the two areas.
[25]
Each of the inlet port and the outlet port may have a bent portion.
[26]
A direction in which the inlet port is bent and a direction in which the outlet port is bent may be different from each other.
Effects of the Invention
[27]
According to embodiments, it is possible to implement a battery module in which the inlet and outlet of the cooling fins are alternately arranged to exhibit uniform cooling performance.
Brief description of the drawing
[28]
1 is a configuration diagram in which a cooling passage according to the prior art is arranged.
[29]
2 is a perspective view showing a battery module according to an embodiment of the present invention.
[30]
3 is a perspective view illustrating a connection relationship between a cooling manifold and a cooling pipe in the embodiment of FIG. 2.
[31]
4 is a side view as viewed from one side of the battery module according to the embodiment of FIG. 2.
[32]
5 is a front view showing one heat sink included in the battery module according to the embodiment of FIG. 2.
[33]
6 is a front view illustrating another heat sink adjacent to the heat sink described in FIG. 5.
[34]
7 is a perspective view illustrating a battery module to which a buffer member is added in the embodiment of FIG. 2.
[35]
8 is a side view as viewed from one side of the battery module according to the embodiment of FIG. 7.
[36]
9 is a front view showing a modified example of the cooling fin described in FIG. 5.
[37]
10 is a front view showing a modified example of the cooling fin described in FIG. 6.
Mode for carrying out the invention
[38]
Hereinafter, various embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art can easily implement the present invention. The present invention may be implemented in various different forms and is not limited to the embodiments described herein.
[39]
In addition, throughout the specification, when a part "includes" a certain component, it means that other components may be further included rather than excluding other components unless otherwise stated.
[40]
In addition, throughout the specification, the term "on a plane" means when the object portion is viewed from above, and when the object portion is viewed from the top, it means when the object portion is viewed from the side.
[41]
2 is a perspective view showing a battery module according to an embodiment of the present invention. 3 is a perspective view illustrating a connection relationship between a cooling manifold and a cooling pipe in the embodiment of FIG. 2. 4 is a side view as viewed from one side of the battery module according to the embodiment of FIG. 2. 5 is a front view showing one heat sink included in the battery module according to the embodiment of FIG. 2. 6 is a front view illustrating another heat sink adjacent to the heat sink described in FIG. 5.
[42]
2 to 4, the battery module 1000 according to an embodiment of the present invention is spaced apart by a certain distance and formed in parallel, between a plurality of battery cells 100 and adjacent battery cells 100 Each includes cooling fins 200 interposed and in close contact. The cooling fin 200 includes a plate-shaped heat sink 205 shown in FIG. 5 to be described later, and a refrigerant pipe 210 formed at an edge of the heat sink 205. The refrigerant pipe 210 may be hook-coupled with the heat sink 205, or the coolant pipe 210 and the heat sink 205 may be integrally formed. The refrigerant pipe 210 is formed to be disposed outside the battery cell 100.
[43]
Although not shown, the battery cells 100 have electrode tabs formed on one or both sides of the electrode body formed in a plate shape, and the electrode tabs of the battery cells 100 are electrically connected to the electrode tabs of the adjacent battery cells 100 They can be connected in series or in parallel.
[44]
5 and 6, the heat sink 205 included in the cooling fin 200 is formed in a plate shape and interposed between the battery cells 100 and then adhered to each other, thereby charging the battery cells 100 or Heat generated in the discharging process can be quickly transferred to the heat sink 205. In addition, the heat sink 205 may be made of a material having high thermal conductivity, such as aluminum or copper, and the heat sink 205 is not limited to such a material, and any material capable of rapidly transferring heat generated from the battery cell 100 It can be used as a material to form. At this time, the heat sink 205 may be formed wider than the electrode body of the battery cell 100.
[45]
The battery module 1000 according to the present embodiment includes a first cooling manifold 300 and a second cooling manifold 400 connected to the cooling fins 200. 2 and 3, each of the first cooling manifold 300 and the second cooling manifold 400 extends along the stacking direction of a battery cell stack comprising a plurality of stacked battery cells 100. . The first cooling manifold 300 and the second cooling manifold 400 are located adjacent to one end of the battery cell stack, and the first cooling manifold 300 and the second cooling manifold 400 are parallel to each other. Can be placed. Further, each of the first cooling manifold 300 and the second cooling manifold 400 is divided into two regions.
[46]
Specifically, the first cooling manifold 300 forms two regions of the inlet manifold 310 and the discharge manifold 320, and the second cooling manifold 400 is also the inlet manifold 410 and the discharge Two regions of the manifold 420 may be formed. The inlet manifolds 310 and 410 provide a path through which the refrigerant is introduced from the outside and the refrigerant is supplied to the cooling fins 200 through the inlets 211 and 213 to cool the heat generated in the battery cell 100. do. On the other hand, the discharge manifolds 320 and 420 provide a path for recovering the refrigerant that has served to cool the heat generated from the battery cell 100 from the cooling fins 200 through the discharge ports 212 and 214.
[47]
At both ends of the refrigerant pipe 210, inlets 211 and 213 and outlets 212 and 214 are formed, respectively, so that the refrigerant passes through the refrigerant pipe 210 to cause heat exchange. In the present embodiment, the inlet 211 and 213 and the outlet 212 and 214 are shown to be formed on one side of the heat sink 205, but variously depending on the shape of the battery cell 100 and the position where the electrode tab is formed. It can be transformed.
[48]
When charging or discharging the battery cell 100, the heat generated from the electrode body of the battery cell 100 is transferred to the refrigerant pipe 210 through the heat sink 205 and passes through the inside of the refrigerant pipe 210. It is delivered and the battery cell 100 is cooled.
[49]
The first cooling fin and the second cooling fin selected from among the plurality of cooling fins 200 may be adjacent cooling fins. The first cooling fin may have a first inlet 211 and a first outlet 212, and the second cooling fin may have a second inlet 213 and a second outlet 214. In this embodiment, the first inlet 211 and the first outlet 212 are respectively located at both ends of the refrigerant pipe 210 included in the first cooling fin, and the second inlet 213 and the second outlet 214 Are located at both ends of the refrigerant pipe 210 included in the second cooling fin.
[50]
The first inlet 211 and the second outlet 214 are connected to the first cooling manifold 300, and the second inlet 213 and the first outlet 212 are connected to the second cooling manifold 400 do. Specifically, the first inlet 211 is connected to the inlet manifold 310 of the first cooling manifold 300, and the first outlet 212 is the discharge manifold 420 of the second cooling manifold 400. ), the second inlet 213 is connected to the inlet manifold 410 of the second cooling manifold 400, and the second outlet 214 is the discharge manifold of the first cooling manifold 300 Connected to 320.
[51]
In the first cooling manifold 300 according to the present embodiment, the first inlet 211 and the second outlet 214 are alternately arranged, and in the second cooling manifold 400, the first outlet 212 and the second As the inlets 213 are alternately arranged, one side of the battery cell 100 is relatively cooled on the left side of the battery cell 100 positioned between the first cooling fin and the second cooling fin, and the right side is relatively cooled. As it is cooled, it can exhibit uniform cooling performance when viewing one battery cell 100. Expanding this embodiment, each of the first cooling manifold 300 and the second cooling manifold 400 is connected to the inlets 211 and 213 and the outlets 212 and 214, and the first cooling manifold ( By designing such that the inlets 211 and 213 and the outlets 212 and 214 are alternately arranged in each of the 300) and the second cooling manifold 400, uniform cooling performance may be exhibited throughout the battery cell stack.
[52]
In FIGS. 2 and 4, it is shown that the cooling fins 200 are formed for each battery cell 100, but as another example of the battery module 1000, the cooling fins 200 between a pair of battery cells 100 It may be interposed and adhered one by one. It is not limited to this structure, and the number of cooling fins 200 may vary according to the battery capacity of the secondary battery.
[53]
Each of the first inlet 211, the first outlet 212, the second inlet 213, and the second outlet 214 may have a bent portion. In this case, the directions in which the first inlet 211 and the second inlet 213 are bent are the same, and the directions in which the first outlet 212 and the second outlet 214 are bent are the same. However, the directions in which the inlets 211 and 213 and the outlets 212 and 214 are bent are different from each other.
[54]
As described above, by having a bent portion in the connection member between the cooling fin 200 and the cooling manifolds 300 and 400 according to the present embodiment, the first inlet 211, the first outlet 212, and the second inlet ( The inlet manifold 310 and the discharge manifold 420 of the first cooling manifold 300 and the second cooling manifold 400, respectively, so that the 213) and the second outlet 214 can implement the connection relationship described above. Can be connected stably.
[55]
7 is a perspective view illustrating a battery module to which a buffer member is added in the embodiment of FIG. 2. 8 is a side view as viewed from one side of the battery module according to the embodiment of FIG. 7.
[56]
7 and 8, all components are the same as the embodiment described in FIGS. 2 to 6, except that the battery module 2000 according to the present embodiment is formed between the battery cells 100 adjacent to each other. It further includes a buffer member 150. When the battery cell 100 swells while the secondary battery is being driven, the buffer member 150 may serve to alleviate an impact due to a change in volume.
[57]
9 is a front view showing a modified example of the cooling fin described in FIG. 5. 10 is a front view showing a modified example of the cooling fin described in FIG. 6.
[58]
9 and 10, there is a difference in the structure of the cooling fin 200 from the embodiment described in FIGS. 5 and 6. The cooling fin 200 according to the present embodiment includes a heat sink 205 and a refrigerant pipe 210 formed in the heat sink 205.
[59]
The refrigerant pipe 210 may have a zigzag structure while overlapping a surface of the battery cell 100 facing the stacking direction of the battery cell stack. In other words, the refrigerant pipe 210 has a zigzag structure and is disposed to substantially overlap the entire surface of the battery cell to cool the battery cell 100. At this time, inlets 211 and 213 and outlets 212 and 214 are formed at both ends of the refrigerant pipe 210, respectively, so that the refrigerant passes through the refrigerant pipe 210 to cause heat exchange.
[60]
Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements by those skilled in the art using the basic concept of the present invention defined in the following claims are also present. It belongs to the scope of rights of
[61]
[Explanation of code]
[62]
10: cooling flow path
[63]
200: cooling fin
[64]
205: heat sink
[65]
210: refrigerant pipe
[66]
211, 213: inlet
[67]
212, 214: outlet
[68]
300, 400: cooling manifold
Claims
[Claim 1]
A battery cell stack including a plurality of battery cells stacked in one direction, cooling fins interposed between the battery cells, and a first cooling manifold and a second cooling manifold connected to the cooling fins, and the cooling The fins include a first cooling fin having a first inlet and a first outlet, and a second cooling fin having a second inlet and a second outlet, and the first inlet and the second outlet are connected to the first cooling manifold. And the second inlet and the first outlet are connected to the second cooling manifold.
[Claim 2]
The battery module of claim 1, wherein each of the first cooling manifold and the second cooling manifold is divided into two regions.
[Claim 3]
In claim 2, wherein the two regions are formed of an inlet manifold and an outlet manifold, the first inlet is connected to the inlet manifold of the first cooling manifold, and the first outlet is the second cooling manifold. The battery module is connected to the discharge manifold of the fold, the second inlet is connected to the inlet manifold of the second cooling manifold, and the second outlet is connected to the discharge manifold of the first cooling manifold.
[Claim 4]
The battery module of claim 3, wherein each of the first inlet, the first outlet, the second inlet, and the second outlet has a bent portion.
[Claim 5]
The battery module of claim 1, wherein each of the first cooling manifold and the second cooling manifold extends along a stacking direction of the battery cell stack.
[Claim 6]
The battery module of claim 1, wherein the cooling fin includes a heat sink and a refrigerant pipe formed at an edge of the heat sink.
[Claim 7]
The battery module of claim 6, wherein the first inlet and the first outlet are respectively located at both ends of the refrigerant pipe.
[Claim 8]
The battery module of claim 1, wherein the cooling fin includes a heat sink and a refrigerant pipe formed inside the heat sink.
[Claim 9]
The battery module of claim 8, wherein the refrigerant pipe has a zigzag structure while overlapping a surface of the battery cell facing a stacking direction of the battery cell stack.
[Claim 10]
The battery module of claim 1, further comprising a buffer member interposed between the battery cells.
[Claim 11]
A battery cell stack including a plurality of battery cells stacked in one direction, cooling fins interposed between the battery cells and having an inlet and an outlet, and a first cooling manifold and a second cooling manifold connected to the cooling fins. And each of the first cooling manifold and the second cooling manifold is connected to the inlet and the outlet, and in each of the first cooling manifold and the second cooling manifold, the inlet and the outlet alternate with each other. Battery modules arranged.
[Claim 12]
The method of claim 11, wherein each of the first cooling manifold and the second cooling manifold is divided into two regions, and the inlet and the outlet connected to the first cooling manifold are different from among the two regions. The battery module is connected to a region, and the inlet and the outlet connected to the second cooling manifold are connected to different regions of the two regions.
[Claim 13]
The battery module of claim 12, wherein each of the inlet port and the outlet port has a bent portion.
[Claim 14]
The battery module of claim 13, wherein a direction in which the inlet port is bent and a direction in which the outlet port is bent are different from each other.
[Claim 15]
The battery module of claim 11, wherein each of the first cooling manifold and the second cooling manifold extends along a stacking direction of the battery cell stack.