Active thermal equalization system of energy storage battery module

Abstract

The invention discloses an active heat equalization system of an energy storage battery module. The active heat equalization system comprises an air-cooled active heat equalization electric core box body, the periphery of the air-cooling active uniform-heating electric core box body is a breathable circumferential wall body, the upper wall body and the lower wall body of the air-cooling active uniform-heating electric core box body are non-breathable wall bodies, a plurality of columnar electric cores are uniformly arranged in the air-cooling active uniform-heating electric core box body in a rectangular manner at equal intervals, and a ventilation gap is formed between any adjacent columnar electric cores; and finally, a stronger soaking effect is achieved on the whole.

Description

Technical Field

[0001] This invention belongs to the field of energy storage. Background Technology

[0002] To make more efficient use of space, energy storage battery boxes are generally designed in rectangular or square structures. However, the air-cooling design based on this structure is prone to uneven airflow distribution. Traditional static air ducts cannot perfectly balance the arrangement of battery cells and airflow paths. At the same time, the traditional positions of air inlets and outlets cannot achieve the same goal, resulting in uneven heat dissipation. For example, if the air duct is narrow or has bends, the airflow resistance increases on the inside of the cabinet corners, causing the local airflow speed to decrease and the heat dissipation effect to deteriorate, which in turn causes some battery cells to not be effectively cooled. Summary of the Invention

[0003] Purpose of the invention: In order to overcome the shortcomings of the existing technology, the present invention provides an active thermal equalization system for energy storage battery modules, which ultimately achieves a stronger heat equalization effect as a whole.

[0004] Technical solution: To achieve the above objectives, the present invention provides an active thermal equalization system for an energy storage battery module, comprising an air-cooled active heat equalization cell housing; the air-cooled active heat equalization cell housing has ventilated circumferential walls on all four sides, and the upper and lower walls of the air-cooled active heat equalization cell housing are non-ventilated walls; a plurality of columnar cells are uniformly arranged in a rectangular shape within the air-cooled active heat equalization cell housing, and ventilation gaps are formed between any adjacent columnar cells;

[0005] The cell array composed of several columnar cells has a central cavity in the center, and a cold air outlet is provided in the central cavity.

[0006] Furthermore, four satellite holes are arranged in a circular array around the outer periphery of the central cavity; each of the four satellite holes is equipped with a rotating pulley; it also includes a square closed-loop airflow dynamic flexible constraint band, the inner sides of the four apex corners of the square closed-loop airflow dynamic flexible constraint band respectively cross over the four pulleys on the side away from the central cavity; the active rotation of any pulley can drive the square closed-loop airflow dynamic flexible constraint band to move linearly along its own path; the square closed-loop airflow dynamic flexible constraint band shuttles through the ventilation gaps in the air-cooled active heat dissipation battery cell box along its own path; a portion of the square closed-loop airflow dynamic flexible constraint band is hollowed out along its length to form a ventilation window.

[0007] Furthermore, at least one of the four pulleys is a drive pulley that can be driven by a motor.

[0008] Furthermore, from a top-down perspective, the centers of the four satellite holes are all located on the diagonal lines of the air-cooled active heat spreader housing.

[0009] Furthermore, the section of the square closed-loop airflow dynamic flexible constraint with ventilation windows is referred to as the airflow constraint zone ventilation section. Apart from the airflow constraint zone ventilation section, the other parts of the square closed-loop airflow dynamic flexible constraint zone are not air-permeable.

[0010] Furthermore, the total length D1 of the ventilation section of the airflow constraint band is no greater than one-quarter of the square closed-loop airflow dynamic flexible constraint band; the distance between the square closed-loop airflow dynamic flexible constraint band and the circumferential wall of the air-cooled active heat-equalizing cell box is denoted as L1, and the side length of the air-cooled active heat-equalizing cell box is denoted as L2, satisfying 4*L1<L2<5*L1; let the width of the ventilation gap between any adjacent columnar cells be d1, and the thickness of any position of the square closed-loop airflow dynamic flexible constraint band be d2; satisfying d2<d1, so that the square closed-loop airflow dynamic flexible constraint band passes through the ventilation gap in the air-cooled active heat-equalizing cell box along its own path, without contacting the outer cylindrical surface of any columnar cell.

[0011] Furthermore, eight sector-shaped areas are divided with the central cavity as the center. The four sector-shaped areas facing the four corners of the air-cooled active heat dissipation battery cell box are designated as sector B, and the remaining four sector-shaped areas are designated as sector A. There is a sector B between any two sector A areas. The direction of the centerline extension of sector A is designated as the v1 direction, and the direction of the centerline extension of sector B is designated as the v2 direction.

[0012] From a top-down perspective, during any complete cycle of the process in which the active rotation of the pulley drives the airflow dynamic flexible constraint belt, which forms a square closed loop, to move linearly along its own path, the midpoint of the permeable section of the airflow constraint belt will successively reach the midline of each sector A and the midline of each sector B.

[0013] Furthermore, in the first case: when the midpoint of the airflow constraint zone ventilation section is on the centerline of sector A, the width of the section occupied by the airflow constraint zone ventilation section in the vertical direction of v1 is consistent with the length D1 of the airflow constraint zone ventilation section itself.

[0014] The second case: When the midpoint of the airflow constraint zone ventilation section is on the centerline of sector B, the width of the airflow constraint zone ventilation section in the vertical direction of v2 is D2. At this time, the airflow constraint zone ventilation section is folded, and the value of D2 is significantly smaller than the value of D1.

[0015] Furthermore, in the heat dissipation mode, the cold air outlet at the central cavity continuously discharges relatively cool air at a certain flow rate. At the same time, the active rotation of the pulley drives the dynamic flexible constraint belt of the airflow, which forms a square closed loop, to move in a periodic linear motion along its own path. In a complete cycle, the midpoint of the ventilation section of the airflow constraint belt will successively reach the midline of each A sector and the midline of each B sector.

[0016] Beneficial effects: During the periodic linear motion of the square closed-loop airflow dynamic flexible constraint band along its own path, the midpoint of the airflow constraint band's permeable section periodically reaches the midline of each A-sector and the midline of each B-sector. This ensures that in each operating cycle, all the cylindrical cells in the air-cooled active heat-equalizing cell box receive a relatively efficient cooling airflow. Through continuous circulation, this ultimately achieves a stronger heat equalization effect overall. Moreover, the core of this solution lies in its ability to achieve a certain wind speed near the corner cells at the distal end. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall energy storage cabinet;

[0018] Figure 2 This is a top-down view of the internal structure of the air-cooled active heat dissipation battery cell housing.

[0019] Figure 3 for Figure 2 Disassembly diagram;

[0020] Figure 4 for Figure 2 A schematic diagram of the partitions from a specific perspective;

[0021] Figure 5 This is a top-view diagram of the dynamic flexible constraint zone of the airflow forming a square closed loop in the first case.

[0022] Figure 6 This is a top-view diagram of the dynamic flexible constraint zone of the airflow forming a square closed loop in the second case.

[0023] Figure 7 for" Figure 8 "", Figure 9 "", Figure 10 A color chart of wind speed contour plots and fluid velocity vector plots from the ANSYS Fluent finite element analysis (FEA) tool.

[0024] Figure 8 The 3D model of this scheme with the removal of the square closed-loop airflow dynamic flexible constraint zone is imported into the ANSYS Fluent software of Finite Element Analysis (FEA) to obtain the wind speed cloud map and fluid velocity vector map from the top view.

[0025] Figure 9The 3D model of the proposed scheme, which has a square closed-loop airflow dynamic flexible constraint zone and the midpoint of the airflow constraint zone ventilation section is on the centerline of sector A, is imported into the ANSYS Fluent software of Finite Element Analysis (FEA) to obtain the wind speed cloud map and fluid velocity vector map from the top view.

[0026] Figure 10 The 3D model of the proposed scheme, which has a square closed-loop airflow dynamic flexible constraint zone and the midpoint of the airflow constraint zone's permeable section is located on the centerline of sector B, is imported into the ANSYS Fluent software of Finite Element Analysis (FEA) for fluid dynamics analysis. The resulting wind speed cloud map and fluid velocity vector map are obtained from a top-down perspective. Detailed Implementation

[0027] The invention will now be further described with reference to the accompanying drawings.

[0028] As attached Figures 1 to 10 An active thermal balancing system for an energy storage battery module is shown, such as Figure 1 As shown, it includes an energy storage cabinet 10, on which several air-cooled active heat-equalizing battery cell boxes 8 are stacked from top to bottom.

[0029] like Figure 2 As shown, the air-cooled active heat-equalizing battery cell housing 8 is square in shape when viewed from above. The circumferential walls of the air-cooled active heat-equalizing battery cell housing 8 are breathable circumferential walls with uniformly hollowed-out ventilation mesh, while the upper and lower walls of the air-cooled active heat-equalizing battery cell housing 8 are non-breathable walls. Several columnar battery cells 2 are uniformly arranged in a rectangular shape inside the air-cooled active heat-equalizing battery cell housing 8, and ventilation gaps 24 are formed between any adjacent columnar battery cells 2.

[0030] like Figure 3 As shown, a central cavity 5 is provided in the center of the cell array composed of several columnar cells 2, and a cold air outlet 1 is provided in the central cavity 5.

[0031] like Figure 3 As shown, four satellite holes 6 are arranged in a circular array around the outer periphery of the central hole 5. From a top-down perspective, the centers of the four satellite holes 6 are all on the diagonal of the air-cooled active heat-spreading battery cell housing 8.

[0032] Each of the four satellite holes 6 is equipped with a pulley 3, and at least one of the four pulleys 3 is a drive wheel that can be driven by a motor.

[0033] like Figure 2 , 3As shown in Figure 5, it also includes a square closed-loop airflow dynamic flexible constraint band 4. The inner sides of the four apex corners of the square closed-loop airflow dynamic flexible constraint band 4 respectively cross over the four pulleys 3 on the side away from the central cavity 5. The active rotation of any pulley 3 can drive the square closed-loop airflow dynamic flexible constraint band 4 to move linearly along its own path. The square closed-loop airflow dynamic flexible constraint band 4 shuttles through the ventilation gap 24 in the air-cooled active heat dissipation battery cell box 8 along its own path. A portion of the square closed-loop airflow dynamic flexible constraint band 4 has ventilation windows 7 hollowed out along its length. The section of the square closed-loop airflow dynamic flexible constraint band 4 with ventilation windows 7 is referred to as the airflow constraint band ventilation section 4a. Except for the airflow constraint band ventilation section 4a, the other parts of the square closed-loop airflow dynamic flexible constraint band 4 are made of non-permeable gas barrier materials, such as rubber or dense nylon fiber.

[0034] Regarding dimensional constraints, the total length D1 of the airflow constraint zone ventilated section 4a in this scheme is no greater than one-quarter of the square closed-loop airflow dynamic flexible constraint zone 4. The distance between the square closed-loop airflow dynamic flexible constraint zone 4 and the circumferential wall of the air-cooled active heat-spreading battery cell housing 8 is denoted as L1, and the side length of the air-cooled active heat-spreading battery cell housing 8 is denoted as L2, satisfying 4*L1<L2<5*L1. Let the width of the ventilation gap 24 between any adjacent columnar battery cells 2 be d1, and the thickness of the square closed-loop airflow dynamic flexible constraint zone 4 at any position be d2. Satisfying d2<d1, the square closed-loop airflow dynamic flexible constraint zone 4 passes through the ventilation gap 24 in the air-cooled active heat-spreading battery cell housing 8 along its own path without contacting the outer cylindrical surface of any columnar battery cell 2, thereby avoiding friction.

[0035] Assuming that the air-cooled active heat-spreading battery cell housing 8 of this scheme does not have a square closed-loop dynamic flexible airflow constraint band 4, in the start-up heat dissipation mode, the cold air outlet 1 at the central cavity 5 continuously discharges slightly cool air at a certain flow rate, causing the slightly cool air to diffuse evenly to the surroundings with the central cavity 5 as the center, and finally overflow to the outside through the ventilation mesh on the circumferential wall of the air-cooled active heat-spreading battery cell housing 8, thereby achieving the purpose of active cooling. In this heat dissipation mode, the wind speed in the air-cooled active heat-spreading battery cell housing 8 is smaller the further away from the central cavity 5, and the wind speed gradient is too steep, which significantly reduces the heat dissipation efficiency of the columnar battery cells 2 in the ring of air-cooled active heat-spreading battery cell housing 8 that is far away from the central cavity 5.

[0036] Furthermore, this solution designates the columnar cells 2 located at the four corners of the air-cooled active heat dissipation cell housing 8 as the distal corner cells 9. The distal corner cells 9 are farther from the central cavity 5 than the other columnar cells 2, and the wind speed near the distal corner cells 9 is lower, resulting in a serious problem of insufficient heat dissipation efficiency of the distal corner cells 9.

[0037] like Figure 8 The 3D model of this scheme with the removal of the square closed-loop airflow dynamic flexible constraint band 4 is imported into the ANSYS Fluent software for Finite Element Analysis (FEA). Boundary conditions are defined according to the design conditions, with the core boundary conditions as follows: the outlet velocity of the cold air outlet 1 is defined as 0.8 m / s; the circumferential walls of the air-cooled active heat-spreading battery cell housing 8 are defined as porous, breathable walls connected to atmospheric pressure; and the upper and lower walls of the air-cooled active heat-spreading battery cell housing 8 are defined as non-breathable walls. The fluid medium is defined as air. The resulting wind speed cloud map and fluid velocity vector map from a top-down perspective are shown below. Figure 8 As shown, the analysis of the model using ANSYS Fluent reveals the following:

[0038] The gas diffuses evenly outward from the central cavity 5 and eventually overflows into the outside through the ventilation mesh on the circumferential wall of the air-cooled active heat dissipation cell housing 8. The wind speed decreases further away from the central cavity 5, and the wind speed gradient is too steep, which significantly reduces the heat dissipation efficiency of the columnar cells 2 in the air-cooled active heat dissipation cell housing 8 that are far from the central cavity 5. Moreover, the wind speed near the corner cells 9 at the far end is even lower and almost zero, resulting in a serious problem of insufficient heat dissipation efficiency of the corner cells 9 at the far end.

[0039] To better explain the advantages of the square closed-loop dynamic flexible constraint zone 4 introduced in this scheme, eight fan-shaped regions are divided around the central cavity 5, such as... Figure 4 The four sector-shaped areas facing the four corners of the air-cooled active heat-spreading battery cell housing 8 are designated as sector B, and the remaining four sector-shaped areas are designated as sector A; there is a sector B between any two sector A areas; such as Figure 5 Let the direction of the extension of the centerline of sector A be denoted as the v1 direction, such as... Figure 6 The direction of the centerline extension of sector B is denoted as the v2 direction;

[0040] From a top-down perspective, during any complete cycle of the process in which the active rotation of pulley 3 drives the airflow dynamic flexible constraint belt 4, which forms a square closed loop, to move linearly along its own path, a complete cycle is about 5 seconds. The midpoint of the airflow constraint belt permeable section 4a will successively reach the midline of each A sector and the midline of each B sector.

[0041] Since only the airflow constraint section 4a of the square closed-loop airflow dynamic flexible constraint band 4 is permeable, from a top-down perspective, as the cold air outlet 1 at the central cavity 5 continuously discharges relatively cold air at a certain flow rate, the relatively cold air is concentrated from the central cavity 5 and flows preferentially towards the side with the airflow constraint section 4a. This avoids the problem of the cold air spreading to the surrounding areas and causing the flow velocity to decrease too quickly, thus making the wind speed gradient decrease more smoothly. Consequently, even near the columnar cell 2 furthest from the cold air outlet 1 in the direction of the airflow constraint section 4a, there is a certain wind speed as much as possible.

[0042] During the linear motion of the square closed-loop airflow dynamic flexible constraint zone 4 along its own path, at least two of the following situations exist:

[0043] The first scenario: During the linear motion of the square-shaped closed-loop airflow dynamic flexible constraint band 4 along its own path, when the midpoint of the permeable section 4a of the airflow constraint band is on the centerline of sector A, as shown... Figure 5 As shown, the width of the section occupied by the airflow constraint zone perforation section 4a in the vertical direction of v1 is consistent with the length D1 of the airflow constraint zone perforation section 4a itself; therefore, the relatively cold air flows preferentially towards v1 from the central cavity 5, so that the corresponding A-sector area generally obtains sufficient flow velocity, and that there is also a certain wind speed near the columnar battery cell 2 farthest from the cold air outlet 1 in the direction of the airflow constraint zone perforation section 4a; Figure 9 The 3D model of the proposed scheme with a square closed-loop airflow dynamic flexible constraint band 4 is imported into the ANSYS Fluent software for Finite Element Analysis (FEA). In this 3D model, the midpoint of the permeable section 4a of the airflow constraint band is on the centerline of sector A. Boundary conditions are defined according to the design conditions, with the core boundary conditions as follows: the outlet velocity of the cold air outlet 1 is defined as 0.8 m / s; the circumferential walls of the air-cooled active heat-spreading battery cell housing 8 are defined as porous permeable walls connected to atmospheric pressure; and the upper and lower walls of the air-cooled active heat-spreading battery cell housing 8 are defined as non-permeable walls. The fluid medium is defined as air. The resulting wind speed cloud map and fluid velocity vector map from a top-down perspective are shown below. Figure 9 As shown, the analysis of the model by ANSYS Fluent shows that: the A sector area generally obtains sufficient flow velocity, so that there is also a certain wind speed near the columnar cell 2 that is farthest from the cold air outlet 1 in the direction of the airflow constraint zone 4a.

[0044] The second scenario: During the linear motion of the square closed-loop airflow dynamic flexible constraint band 4 along its own path, when the midpoint of the airflow constraint band permeable segment 4a is on the centerline of sector B, the width of the interval occupied by the airflow constraint band permeable segment 4a in the perpendicular direction of v2 is D2, as shown below. Figure 6 As shown, since the airflow constraint zone perforated section 4a is angled at this time, the value of D2 is significantly smaller than the value of D1. Therefore, the cooler air flows relatively concentratedly towards the v2 direction, starting from the central cavity 5. Since the width of the section D2 occupied by the airflow constraint zone perforated section 4a in the vertical direction of v2 is significantly smaller than D1, it is equivalent to a narrower effective airflow channel under the same flow rate. This results in a significantly stronger wind speed flowing through the airflow constraint zone perforated section 4a compared to the wind speed in the "first case," thereby providing a certain wind speed near the distal corner cell 9. Figure 10 The 3D model of the proposed scheme with a square closed-loop airflow dynamic flexible constraint band 4 is imported into the ANSYS Fluent software for Finite Element Analysis (FEA). In this 3D model, the midpoint of the permeable section 4a of the airflow constraint band is on the centerline of sector B. Boundary conditions are defined according to the design conditions, with the core boundary conditions as follows: the outlet velocity of the cold air outlet 1 is defined as 0.8 m / s; the circumferential walls of the air-cooled active heat-spreading battery cell housing 8 are defined as porous permeable walls connected to atmospheric pressure; and the upper and lower walls of the air-cooled active heat-spreading battery cell housing 8 are defined as non-permeable walls. The fluid medium is defined as air. The resulting wind speed cloud map and fluid velocity vector map from a top-down perspective are shown below. Figure 10 As shown in the analysis of the model by ANSYS Fluent, the colder air flows more concentratedly towards the v2 direction starting from the central cavity 5. The reason is that the width D2 of the section 4a of the airflow constraint zone in the vertical direction of v2 is significantly smaller than D1. This means that the effective airflow channel is narrower under the same flow rate. As a result, the wind speed flowing through the airflow constraint zone 4a is significantly more concentrated than the wind speed in the "first case", thus providing a certain wind speed near the corner cell 9 at the distal end.

[0045] As the airflow dynamic flexible constraint band 4, which forms a square closed loop, moves periodically along its own path, the midpoint of the airflow constraint band ventilation section 4a will periodically reach the midline of each sector A and the midline of each sector B. This ensures that in each operating cycle, all the cylindrical cells 2 in the air-cooled active heat-spreading cell box 8 will receive a relatively efficient cooling airflow. In the continuous circulation process, a stronger heat-spreading effect is ultimately achieved as a whole.

[0046] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An active thermal balancing system for an energy storage battery module, characterized in that: It includes an air-cooled active heat-equalizing battery cell housing (8); the air-cooled active heat-equalizing battery cell housing (8) has a ventilated circumferential wall around its perimeter, and the upper and lower walls of the air-cooled active heat-equalizing battery cell housing (8) are non-ventilated walls. The air-cooled active heat-equalizing battery cell housing (8) has a number of columnar battery cells (2) arranged in a rectangular equidistant manner, and ventilation gaps (24) are formed between any adjacent columnar battery cells (2). A central cavity (5) is provided in the center of the cell array composed of the plurality of columnar cells (2), and a cold air outlet (1) is provided in the central cavity (5).

2. The active thermal balancing system for an energy storage battery module according to claim 1, characterized in that: The outer periphery of the central cavity (5) is arranged in a circular array with four satellite cavities (6); each of the four satellite cavities (6) is rotatably equipped with a pulley (3); it also includes a square closed loop airflow dynamic flexible constraint belt (4), the inner sides of the four vertices of the square closed loop airflow dynamic flexible constraint belt (4) respectively cross the four pulleys (3) away from the central cavity (5); the active rotation of any pulley (3) can drive the square closed loop airflow dynamic flexible constraint belt (4) to move linearly along its own path; the square closed loop airflow dynamic flexible constraint belt (4) shuttles through the ventilation gap (24) in the air-cooled active heat-spreading battery cell box (8) along its own path; a part of the square closed loop airflow dynamic flexible constraint belt (4) is hollowed out along its length and has a ventilation window (7).

3. The active thermal balancing system for an energy storage battery module according to claim 2, characterized in that: At least one of the four pulleys (3) is a drive pulley that can be driven by a motor.

4. The active thermal balancing system for an energy storage battery module according to claim 2, characterized in that: From a top-down perspective, the centers of the four satellite holes (6) are all on the diagonal of the air-cooled active heat dissipation battery cell housing (8).

5. The active thermal balancing system for an energy storage battery module according to claim 2, characterized in that: The section of the airflow dynamic flexible constraint band (4) that forms a square closed loop with ventilation windows (7) is called the airflow constraint band ventilation section (4a). Except for the airflow constraint band ventilation section (4a), the other parts of the airflow dynamic flexible constraint band (4) that forms a square closed loop are not breathable.

6. The active thermal balancing system for an energy storage battery module according to claim 5, characterized in that: The total length D1 of the airflow constraint zone ventilation section (4a) is not greater than one-quarter of the airflow dynamic flexible constraint zone (4) forming a square closed loop; the distance between the airflow dynamic flexible constraint zone (4) forming a square closed loop and the circumferential wall of the air-cooled active heat-spreading battery cell box (8) is denoted as L1, and the side length of the air-cooled active heat-spreading battery cell box (8) is denoted as L2, satisfying 4*L1<L2<5*L1; let the width of the ventilation gap (24) between any adjacent columnar battery cells (2) be d1, and the thickness of any position of the airflow dynamic flexible constraint zone (4) forming a square closed loop be d2; satisfying d2<d1, so that the airflow dynamic flexible constraint zone (4) forming a square closed loop shuttles through the ventilation gap (24) in the air-cooled active heat-spreading battery cell box (8) along its own path, without contacting the outer cylindrical surface of any columnar battery cell (2).

7. The active thermal balancing system for an energy storage battery module according to claim 5, characterized in that: Eight fan-shaped areas are divided with the central cavity (5) as the center. The four fan-shaped areas facing the four corners of the air-cooled active heat-spreading battery cell box (8) are called B fan-shaped areas, and the other four fan-shaped areas are called A fan-shaped areas. There is a B fan-shaped area between any two A fan-shaped areas. The direction of the center line extension of the A fan-shaped area is called the v1 direction, and the direction of the center line extension of the B fan-shaped area is called the v2 direction. From a top-down perspective, during any complete cycle of the process in which the active rotation of the pulley (3) drives the airflow dynamic flexible constraint belt (4) into a square closed loop to move along its own path, the midpoint of the airflow constraint belt permeable section (4a) will successively reach the midline of each A sector and the midline of each B sector.

8. The active thermal balancing system for an energy storage battery module according to claim 5, characterized in that: The first case: When the midpoint of the airflow constraint zone perforated section (4a) is on the center line of sector A, the width of the section occupied by the airflow constraint zone perforated section (4a) in the vertical direction of v1 is consistent with the length D1 of the airflow constraint zone perforated section (4a). The second case: When the midpoint of the airflow constraint zone perforated section (4a) is on the center line of sector B, the width of the section occupied by the airflow constraint zone perforated section (4a) in the vertical direction of v2 is D2. At this time, the airflow constraint zone perforated section (4a) is folded, and the value of D2 is significantly smaller than the value of D1.

9. The active thermal balancing system for an energy storage battery module according to claim 5, characterized in that: In the heat dissipation mode, the cold air outlet (1) at the central cavity (5) continuously discharges relatively cold air at a certain flow rate. At the same time, the active rotation of the pulley (3) drives the airflow dynamic flexible constraint belt (4) into a square closed loop to move in a periodic linear motion along its own path. In a complete cycle, the midpoint of the airflow constraint belt ventilation section (4a) will successively reach the midline of each A sector and the midline of each B sector.

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