KR20180058088A - Battery modules for electric vehicle with improved cooling characteristics - Google Patents

Abstract

The present invention relates to a battery module for an electric vehicle with improved cooling characteristics capable of improving cooling characteristics by designing the volume of a cooling flow path on the battery cell side having the highest temperature among the battery cells to be the largest, while designing the volume in the cooling flow path of the battery cell on the end side to be the smallest by gradually decreasing the volume of the cooling flow path on the remaining battery cells. A battery module for an electric vehicle having improved cooling characteristics according to the present invention comprises a plurality of battery cells formed to be narrowed in the rightward direction; and a plurality of battery cell side cooling flow paths respectively installed between the plurality of battery cells, on the left side of the first battery cell from the left side and on the right side of the last battery cell from the left side so as to cool the heat generated from the plurality of battery cells; and a fluid injection cooling flow path installed at a lower portion of the plurality of battery cells to inject a cooling fluid; a fluid discharge cooling flow path installed at an upper portion of the plurality of battery cells to discharge a cooling fluid that passed through the plurality of battery cell side cooling flow path; and an overall Z-shaped cooling flow path, wherein the plurality of battery cell side cooling flow paths are configured so that the first battery cell side cooling flow path from the left side has the largest volume and with the volume narrowed from the left to the right side, the last battery cell side cooling flow path from the left side has the smallest volume.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a battery module for an electric vehicle,

The present invention relates to a battery module for an electric vehicle having improved cooling characteristics, and more particularly, to a battery module for an electric vehicle in which the volume of the cooling channel on the side of the battery cell having the highest temperature among the battery cells is designed to be largest and the volume of the cooling channel on the remaining battery cells is gradually reduced And more particularly, to a battery module for an electric vehicle with improved cooling characteristics that can be improved in cooling characteristics by designing the smallest volume in the cooling channel of the end side battery cell.

Typically, a significant amount of heat is generated in a battery pack in an electric vehicle. Various cooling methods have been proposed and studied in order to change the generated heat to an appropriate operating temperature value.

Non-Patent Document 1 [Saw, L. H., Ye, Y., Tay, A. A., Chong, W. T., Kuan, S.H., and Yew, M.C. "Computational fluid dynamic and thermal analysis of Lithium-ion battery pack with air cooling." Applied Energy 177 (2016): 783-792.) Discloses that the thermal performance of a battery pack is analyzed according to various mass flow rates of cooling air using steady-state simulations. Non-Patent Document 2 [Chen, D., Jiang, J., Kim, G. H., Yang, C., and Pesaran, A. "Comparison of different cooling methods for lithium ion battery cells." Applied Thermal Engineering 94 (2016): 846-854.) Discloses comparing and analyzing the cooling of one lithium ion battery cell in four ways: air cooling, direct liquid cooling, jacket cooling, and fin cooling. Non-Patent Document 3 [Liu, Feifei, Fengchong Lan, and Jiqing Chen. &Quot; Dynamic thermal characteristics of heat pipe via segmented thermal resistance model for electric vehicle battery cooling. &Quot; Journal of Power Sources 321 (2016): 57-70.) Discloses thermal behavior and cooling performance using an ultra-thin micro heat pipe battery pack. Non-Patent Document 4 [Choi, Yong Seok, and Dal Mo Kang. "Prediction of thermal behaviors of an air-cooled lithium-ion battery system for hybrid electric vehicles." Journal of Power Sources 270 (2014): 273-280.) Discloses developing a thermal model structure that determines the appropriate battery cooling capacity for an air-cooled hybrid vehicle. Non-Patent Document 5 [Yeow, K., Teng, H., Thelliez, M., and Tan, E. "Comparative study on thermal behavior of lithium-ion battery systems with indirect air cooling and indirect liquid cooling." ASME / ISCIE 2012 International Symposium on Flexible Automation. American Society of Mechanical Engineers, 2012.] discloses the advantage of using air compared to using liquid to remove heat from the fin end of the pin cooling system. Non-Patent Document 6 [Park, Heesung. "A design of air flow configuration for cooling lithium ion batteries in hybrid electric vehicles." Journal of Power Sources 239 (2013): 30-36.) Has proposed a theoretical analysis that changes the design and placement of conventional battery forced air cooling.

In such non-patent documents, the analysis is performed while collectively changing the value of the interval of the battery cells, and the analysis is not carried out with different values depending on intervals of the battery cells.

A battery module is disclosed in Patent Document 1 (Japanese Patent Laid-Open Publication No. 2016-0041411). The battery module is installed in a chassis of an electric vehicle or a hybrid vehicle, And a plurality of cooling plates inserted in a space formed between the battery cells, at least one side of which extends longer than the battery cells and is in contact with the chassis, And at least one heat pipe is contained in the heat exchanger.

The conventional battery module thus configured has an advantage that the operation of the structure and the cooling system is simple and effective, and the intervals of the battery cells are constant as in the case of the non-patent door hurdies described above.

On the other hand, it has become necessary to increase the cooling efficiency by making the intervals of the battery cells different from each other without changing the entire volume of the cooling flow path located between the battery cells.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a battery module for an electric vehicle with improved cooling characteristics that can improve cooling efficiency while having a simple structure.

According to an aspect of the present invention, there is provided a battery module for an electric vehicle having improved cooling characteristics, the battery module including: a plurality of battery cells formed to be spaced apart from each other in a clockwise direction; And a plurality of battery cell side cooling flow paths respectively provided between the plurality of battery cells, a first battery cell from the left side and a right side of the last battery cell from the left side of the battery cell, respectively, for cooling the heat generated in the plurality of battery cells, A fluid injection cooling flow path provided at a lower portion of the plurality of battery cells to inject a cooling fluid and a fluid discharge cooling flow path provided at an upper portion of the plurality of battery cells to discharge a cooling fluid passing through the plurality of battery cell side cooling flow paths, Wherein the plurality of battery cell side cooling flow paths have the largest volume of the first battery cell side cooling flow path from the left side and the volume is narrowed from the left to the right side, And the smallest volume in the cooling channel on the side of the first battery cell And that is characterized.

In the battery module for an electric vehicle having improved cooling characteristics according to the above embodiment, the first battery cell from the left side of the plurality of battery cells can generate the highest temperature.

According to another aspect of the present invention, there is provided a battery module for an electric vehicle having improved cooling characteristics, comprising: a plurality of battery cells formed to extend in a rightward direction and to be spaced apart from each other; And a plurality of battery cell side cooling flow paths respectively provided between the plurality of battery cells, a first battery cell from the left side and a right side of the last battery cell from the left side of the battery cell, respectively, for cooling the heat generated in the plurality of battery cells, A fluid injection cooling flow path provided at a lower portion of the plurality of battery cells to inject a cooling fluid and a fluid discharge cooling flow path provided at an upper portion of the plurality of battery cells to discharge a cooling fluid passing through the plurality of battery cell side cooling flow paths, And a U-shaped cooling passage which is generally U-shaped. The plurality of battery-cell-side cooling flow paths have the largest volume of the cooling channel on the last battery cell side from the left side, And the smallest volume in the first cooling channel on the battery cell side And that is characterized.

In the battery module for an electric vehicle having improved cooling characteristics according to the another embodiment, the plurality of battery cells may generate the highest temperature of the last battery cell from the left.

According to the battery module for an electric vehicle having improved cooling characteristics according to the embodiment of the present invention, a battery module for an electric vehicle with improved cooling characteristics includes a plurality of battery cells formed to be narrowed in the rightward direction; And a plurality of battery cell side cooling flow paths respectively provided between the plurality of battery cells, a first battery cell from the left side and a right side of the last battery cell from the left side of the battery cell, respectively, for cooling the heat generated in the plurality of battery cells, A fluid injection cooling flow path provided at a lower portion of the plurality of battery cells to inject a cooling fluid and a fluid discharge cooling flow path provided at an upper portion of the plurality of battery cells to discharge a cooling fluid passing through the plurality of battery cell side cooling flow paths, Wherein the plurality of battery cell side cooling flow paths have the largest volume of the first battery cell side cooling flow path from the left side and the volume is narrowed from the left to the right side, And the smallest volume in the cooling channel on the side of the first battery cell The cooling efficiency can be improved by a simple method of weighting the volume of the first cooling channel on the battery cell side where the temperature of the battery cell is the highest without changing the volume of the entire cooling channel, the flow rate of the air inlet, It has excellent effect.

According to another aspect of the present invention, there is provided a battery module for an electric vehicle having improved cooling characteristics, comprising: a plurality of battery cells formed to extend in a rightward direction and to be spaced apart; And a plurality of battery cell side cooling flow paths respectively provided between the plurality of battery cells, a first battery cell from the left side and a right side of the last battery cell from the left side of the battery cell, respectively, for cooling the heat generated in the plurality of battery cells, A fluid injection cooling flow path provided at a lower portion of the plurality of battery cells to inject a cooling fluid and a fluid discharge cooling flow path provided at an upper portion of the plurality of battery cells to discharge a cooling fluid passing through the plurality of battery cell side cooling flow paths, And a U-shaped cooling passage which is generally U-shaped. The plurality of battery-cell-side cooling flow paths have the largest volume of the cooling channel on the last battery cell side from the left side, And the smallest volume in the first cooling channel on the battery cell side The cooling efficiency can be improved by a simple method of weighting the volume of the last-time battery cell-side cooling flow path from the leftmost side where the temperature of the battery cell is the highest without changing the volume of the entire cooling flow path, the flow rate of the air inlet port, There is an excellent effect that can be made.

1 is a side sectional view of a battery module for an electric vehicle with improved cooling characteristics according to a first embodiment of the present invention.
2 is a side cross-sectional view of a battery module for an electric vehicle with improved cooling characteristics according to a second embodiment of the present invention.
FIG. 3A is a perspective view of the battery module of FIG. 1. FIG.
3B is a perspective view of the battery module of FIG. 2. FIG.
FIG. 4 is a graph illustrating a battery cell temperature change according to a battery cell number in the battery module of FIG. 1;
FIG. 5 is a graph illustrating a battery cell temperature change according to a battery cell number in the battery module of FIG. 2. FIG.
6 is a view showing a temperature type of a basic model for a Z-shaped battery module.
7 is a diagram showing a temperature type of a type 1 model (corresponding to a battery module according to the first embodiment of the present invention) for a Z-shaped battery module.
8 is a view showing the temperature type of the Type 2 model for the Z-shaped battery module.
Fig. 9 is a diagram showing a temperature pattern of a basic model for a U-shaped battery module. Fig.
10 is a view showing a temperature type of a Type 1 model for a U-shaped battery module.
11 is a view showing the temperature type of the Type 2 model (corresponding to the battery module according to the second embodiment of the present invention) for the U-shaped battery module.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a side cross-sectional view of a battery module for an electric vehicle with improved cooling characteristics according to a first embodiment of the present invention. FIG. 2 is a sectional view of a battery module for an electric vehicle with improved cooling characteristics according to a second embodiment of the present invention. FIG. 3A is a perspective view of the battery module of FIG. 1, and FIG. 3B is a perspective view of the battery module of FIG. 2. FIG.

[First embodiment of the present invention]

As shown in FIG. 1, a battery module for an electric vehicle having improved cooling characteristics according to the first embodiment of the present invention includes a plurality of battery cells 130 and a Z-shaped cooling passage.

The plurality of battery cells 130 are formed so as to be spaced apart from each other as they progress toward the right side and the battery cell side cooling passages 140: 140 ₁ , 140 ₂ , 140 ₃ ..., 140 ₂₀ , 140 ₂₁ are inserted and installed. Each of the battery cells 130 generates a DC voltage of a constant voltage and a plurality of battery cells 130 are connected to generate a voltage required by the electric vehicle. The plurality of battery cells 130 generate a high temperature at which the first battery cell from the left is possible, and the temperature tends to decrease as the battery cell 130 progresses from the first battery cell to the right.

The Z-shaped cooling flow path serves to cool the heat generated in the plurality of battery cells 130 and has a Z-shape as a whole. The Z-shaped cooling flow path includes a plurality of battery-cell-side cooling flow paths 140 _1, 140 ₂ disposed between the plurality of battery cells 130, and a right side of the last battery cell 130 from the left and right of the first battery cell 130 from the left _, 140 _21), is provided at the lower part of the plurality of battery cells 130, the cooling fluid and the fluid injection mold tube 110 to be injected, a plurality of installed on the top of the battery cell 130, a plurality of battery cell side cooling flow passage ( And a fluid discharge cooling channel (120) through which the cooling fluid having passed through the fluid discharge cooling channel (140) is discharged.

A plurality of battery cell side cooling flow passage 140 is narrowed, the volume and having a largest volume of the first battery cell side cooling flow passage (140 ₁₎ from the left side going to the right most in the last second battery cell side cooling flow passage (140 ₂₁₎ from left to Small volume.

[Second embodiment of the present invention]

As shown in FIG. 2, a battery module for an electric vehicle with improved cooling characteristics according to a second embodiment of the present invention includes a plurality of battery cells 230 and a U-shaped cooling passage.

The plurality of battery cells 230 are formed to extend in the right direction and are spaced apart from each other. In order to cool the heat generated between the plurality of battery cells 230, battery cell side cooling passages 240: 240 ₁ , 240 ₂ , 240 ₃ ..., 240 ₂₀ , 240 ₂₁ are inserted and installed. Each of the battery cells 230 generates a DC voltage of a predetermined voltage, and a plurality of battery cells 230 are connected to generate a voltage required by the electric vehicle. The plurality of battery cells 230 exhibit the highest temperature from the left to the last battery cell, and the temperature tends to decrease as the battery cell 230 moves from the last battery cell to the left.

The U-shaped cooling flow path serves to cool the heat generated in the plurality of battery cells 230 and forms a U-shape as a whole. The U-shaped cooling flow path includes a plurality of battery-cell-side cooling flow paths 240: 240 (240: 240) respectively provided between the battery cells 230 and the right side of the last battery cell 230 from the left and right sides of the first battery cell 230 ₁ , 240 ₂ , 240 ₃ , 240 ₂₀ , and 240 ₂₁ , a fluid injection cooling channel 210 installed below the plurality of battery cells 230 to inject a cooling fluid, And a fluid discharge cooling channel 220 installed at an upper portion of the battery cell side cooling passage 240 to discharge a cooling fluid having passed through the plurality of battery cell side cooling channels 240.

A plurality of battery cell side cooling flow passage 240 is narrowed, the volume while progress has the largest volume, the last second battery cell side cooling flow passage (240 ₂₁₎ from the left side to the left from the cooling flow passage (240 _21), the first battery cell side from the left And is configured to have the smallest volume in the cooling channel 240 ₁ .

Hereinafter, the operation of a battery model for an electric vehicle with improved cooling characteristics according to embodiments of the present invention will be described using a finite element technique.

1. Analysis model production

The basic model of the analysis is the battery module with U-shaped and Z-shaped cooling channels. The battery module includes 20 battery cells 130 and 230 and 21 cooling channels 140 and 240.

One of the battery cells 130 and 230 has a pouch cell type of 130 (High) * 30 (Width) * 6.5 (Thickness).

In order to shorten the analysis time, the tap is modeled as a shape of the battery cell without the tap portion. The 2D shape of the cooling channel is as shown in FIG. 1 and FIG. 2,

[Table 1]

Respectively.

The 3D shape protrudes 30 mm from the 2D shape and is shown in FIGS. 3A and 3B.

In the basic model, there are 21 cooling flow channels of 2 * 30 * 130 인접 adjacent to the battery cells.

The comparison model (Type 1) does not change the overall volume of the basic model, but the volume of the cooling flow paths 140 ₁ , 240 ₁ closest to the INLET of the cooling flow path is 130 * 30 * The volume of the _21st cooling channel (140 ₂₁ , 240 ₂₁ ) is reduced to 130 * 30 * 1..

The comparison model (Type 2) does not change the overall volume of the basic model, but the volume of the cooling flow paths 140 ₂₁ , 240 ₂₁ farthest from the INLET of the cooling flow path is 130 * 30 * The volume of the first cooling channel (140 ₁ , 240 ₁ ) is reduced to 130 * 30 * 1 줄 by reducing 130 * 30 * 0.1..

Weigh the volume of the cooling channel adjacent to the battery cell in the same way as above.

2. Grid creation

For the numerical analysis, grid was created using Ansys mesh. Tetrahedrons and hex dominant were used for the calculation. The number of nodes, the number of grids, and the average element quality for each model are shown in Table 2

[Table 2]

.

3. Initial and boundary conditions

In order to analyze the flow and temperature distribution after 10 minutes from the initial state, the analysis type was set to an abnormal state flow and the total time was set to 600 s.

The battery cell was set to a solid domain and the material was set to aluminum.

The initial temperature of the battery cell was 65 ° C, and the air as the cooling fluid was a fluid domain. The initial temperature of the air inside the battery module was set at 30 캜. The viscous flow was taken into account for friction with the wall.

The k-epsilon model was used for the turbulent analysis and the Monte Carlo law was applied considering the thermal radiation of the battery cell. Gravity was applied in the X-axis direction to account for buoyancy by gravity. In both the solid domain and the fluid domain, the heat flux was 400 W / m 2.

Inlets and outlets, which are boundary conditions, have 4m / s of air in and out, respectively. The inlet air temperature was set at 25 ° C.

4. Results

Z-shaped and U-shaped battery modules Cooling analysis is performed to determine the temperature of the center of the battery cell as shown in Tables 3 and 4

[Table 3]

[Table 4]

Similarly, models with larger cooling channel volume between high temperature cells in the base model exhibited low average and low standard deviation temperatures in both Z and U shaped battery modules. That is, in the Z-shaped battery module, the comparative model (Z Type 1) (the model corresponding to the first embodiment of the present invention) and the comparative model (Type 2) ) Showed low mean and low standard deviation, respectively.

Referring to FIG. 4, there is shown a graph illustrating a battery cell temperature change according to a battery cell number in a Z-shaped battery module, wherein a battery module of a comparative model (Z Type 1) and the volume of the cooling channel (140 ₁₎ to the left of the zoom model, the basic model (Z basic) that more than from 1 cell temperature is lower and 15 to the cell, a high temperature from the 16th cell # 20 cells by Able to know.

The battery module of the comparative model (Z Type 2) in which the volume of the cooling channel on the right side of the cell 20 is increased in the basic model shows that the cell temperature of the battery cell is higher than that of the basic model have.

The volume of the cooling channel between cell # 10 and cell # 11 is 130 * 30 * 2 같은, which is the same for both the basic model and the comparative model (Z Type 1, (Z Type 2).

As a result, in the Z-shaped battery module, the comparative model (Z Type 1) (model corresponding to the first embodiment of the present invention) exhibits lower average temperature and lower standard deviation temperature than the basic model and the comparative model (Z Type 2) It can be seen that the cooling effect is excellent.

Referring to FIG. 5, there is shown a graph illustrating a battery cell temperature change according to a battery cell number in a U-shaped battery module, wherein a comparison model in which the volume of the cooling channel on the left side of the cell # 1, (U Type 1) battery module has a lower temperature from the first cell to the seventh cell and a higher temperature from the second cell to the second cell than the basic model.

The battery module of the comparative model (U Type 2) in which the volume of the cooling channel on the right side of the cell No. 20 in the base model having a high battery cell temperature is increased, Lower than model

The volume of the cooling channel between cell # 10 and cell # 11 is 130 * 30 * 2 같은, which is the same for both the basic model and the comparative model (U Type 1 and U Type 2).

As a result, in the U-shaped battery module, the comparison model (U Type 2) (the model corresponding to the second embodiment of the present invention) exhibits lower average temperature and lower standard deviation temperature than the basic model and the comparative model (U Type 1) It can be seen that the cooling effect is excellent.

FIG. 6 is a view showing a temperature form of the basic model for the Z-shaped battery module, and FIG. 7 is a view showing a temperature form of the Type 1 model (corresponding to the battery module according to the first embodiment of the present invention) FIG. 8 is a view showing the temperature type of the type 2 model for the Z-shaped battery module, and it can be confirmed that the temperature of the battery cell 1 is high as a whole.

FIG. 9 is a view showing a temperature type of a basic model for a U-shaped battery module, FIG. 10 is a view showing a temperature type of a Type 1 model for a U-shaped battery module, (Corresponding to the battery module according to the second embodiment of the present invention), and it can be confirmed that the temperature of the battery cell 20 is high as a whole.

According to the battery module for an electric vehicle having improved cooling characteristics according to the first embodiment of the present invention configured as described above, the battery module for an electric vehicle with improved cooling characteristics is provided with a plurality of battery cells ; And a plurality of battery cell side cooling flow paths respectively provided between the plurality of battery cells, a first battery cell from the left side and a right side of the last battery cell from the left side of the battery cell, respectively, for cooling the heat generated in the plurality of battery cells, A fluid injection cooling flow path provided at a lower portion of the plurality of battery cells to inject a cooling fluid and a fluid discharge cooling flow path provided at an upper portion of the plurality of battery cells to discharge a cooling fluid passing through the plurality of battery cell side cooling flow paths, Wherein the plurality of battery cell side cooling flow paths have the largest volume of the first battery cell side cooling flow path from the left side and the volume is narrowed from the left to the right side, And the smallest volume in the cooling channel on the side of the first battery cell The cooling efficiency can be improved by a simple method of weighting the volume of the first cooling channel on the side of the battery cell with the highest temperature of the battery cell without changing the volume of the entire cooling channel, the flow rate of the air inlet, and the flow velocity .

According to the battery module for an electric vehicle having improved cooling characteristics according to the second embodiment of the present invention constructed as described above, a plurality of battery cells formed so as to be spaced apart from each other in the rightward direction; And a plurality of battery cell side cooling flow paths respectively provided between the plurality of battery cells, a first battery cell from the left side and a right side of the last battery cell from the left side of the battery cell, respectively, for cooling the heat generated in the plurality of battery cells, A fluid injection cooling flow path provided at a lower portion of the plurality of battery cells to inject a cooling fluid and a fluid discharge cooling flow path provided at an upper portion of the plurality of battery cells to discharge a cooling fluid passing through the plurality of battery cell side cooling flow paths, And a U-shaped cooling passage which is generally U-shaped. The plurality of battery-cell-side cooling flow paths have the largest volume of the cooling channel on the last battery cell side from the left side, And the smallest volume in the first cooling channel on the battery cell side The cooling efficiency can be improved by a simple method of weighting the volume of the last-time battery cell-side cooling flow path from the leftmost side where the temperature of the battery cell is the highest without changing the volume of the entire cooling flow path, the flow rate of the air inlet port, .

Although the best mode has been shown and described in the drawings and specification, certain terminology has been used for the purpose of describing the embodiments of the invention and is not intended to be limiting or to limit the scope of the invention described in the claims. It is not. Therefore, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the scope of the present invention. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

110, 210: fluid injection cooling flow path
120, 220: fluid discharge cooling flow path
130, 230: Battery cell
140, 240: cooling channel on the battery cell side
140 ₁ , 240 ₁ : the first cooling cell side cooling flow path from the left side
140 ₂ , 240 ₂ : The second cooling cell side cooling flow path from the left side
140 ₃ , 240 ₃ : The third cooling cell side cooling flow path from the left side
140 ₂₀ , 240 ₂₀ : the 20th battery cell side cooling flow path from the left side
140 ₂₁ , 240 ₂₁ : From the left to the last battery cell side cooling flow path

Claims (4)

A plurality of battery cells formed in such a manner as to be spaced apart from each other in a rightward direction; And
A plurality of battery cell side cooling flow paths respectively provided between the plurality of battery cells, a battery cell side right side of the first battery cell from the left side and a right side from the left side of the first battery cell, respectively, for cooling the heat generated in the plurality of battery cells, A fluid injection cooling channel provided at a lower portion of the plurality of battery cells to inject a cooling fluid and a fluid discharge cooling channel provided at an upper portion of the plurality of battery cells to discharge a cooling fluid passing through the plurality of battery cell side cooling flow channels, And includes a Z-shaped cooling passage which forms a Z-shape as a whole,
Wherein the plurality of battery cell side cooling flow paths are formed such that the first battery cell side cooling flow path from the left side has the largest volume and the right side progressively decreases the volume so as to be the smallest volume in the last battery cell side cooling flow path from the left side, Battery modules for electric vehicles. The method according to claim 1,
Wherein the plurality of battery cells generate the highest temperature of the first battery cell from the left side. A plurality of battery cells formed to extend in a rightward direction and to be spaced apart from each other; And
A plurality of battery cell side cooling flow paths respectively provided between the plurality of battery cells, a battery cell side right side of the first battery cell from the left side and a right side from the left side of the first battery cell, respectively, for cooling the heat generated in the plurality of battery cells, A fluid injection cooling channel provided at a lower portion of the plurality of battery cells to inject a cooling fluid and a fluid discharge cooling channel provided at an upper portion of the plurality of battery cells to discharge a cooling fluid passing through the plurality of battery cell side cooling flow channels, And a U-shaped cooling passage which is generally U-shaped,
Wherein the plurality of battery cell side cooling flow paths have the largest volume in the last battery cell side cooling flow path from the left side and the smallest volume in the left side to be the smallest volume in the first battery cell side cooling flow path from the left side, Improved battery module for electric vehicles. The method of claim 3,
Wherein the plurality of battery cells generate the highest temperature from the leftmost battery cell.

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