Air-cooled energy storage battery pack

Abstract

The utility model aims to provide an air-cooled energy storage battery pack which comprises a box body, a ventilation opening, a battery cell component and a fan, wherein the battery cell component and the fan are positioned in the box body, and a heat dissipation plate and a battery cell are arranged in the battery cell component. Wherein the ventilation openings comprise side face ventilation openings and top ventilation openings located in the upper side of the box body, the multiple battery cell assemblies are horizontally arranged in the width direction of the battery cell assemblies, the draught fan is arranged on one side face, opposite to the length direction of the battery cell assemblies, of the box body, and the side face ventilation openings are formed in the two side faces, opposite to the width direction of the battery cell assemblies, of the box body. Through reasonable layout optimization and additional arrangement of the top ventilation openings, the uniformity of airflow flowing through each battery cell is ensured while the number of the battery cells is increased, the phenomenon that the temperature of the battery cells in a local area is too high is prevented, and the overall heat dissipation performance of the battery pack is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery pack heat dissipation, and more specifically, to the technical field of air-cooled battery pack heat dissipation. Background Art

[0002] Energy storage can not only improve the safety and flexibility of the power grid, but also has high economic efficiency. A large amount of heat is generated during the charge and discharge process of the battery cells and accumulates in the battery pack. If the heat cannot be dissipated, it will not only affect the overall performance of the battery, shorten the battery life, but also increase the system safety risk. At present, the battery heat dissipation methods are mainly divided into air-cooled heat dissipation and liquid-cooled heat dissipation. Air-cooled heat dissipation means that the battery pack drives air flow through a fan to take away the heat generated by the battery cells. Its structure is simple and the cost is low. For example, the Chinese patent with the patent number CN220358193U discloses a battery pack structure with air-cooled heat dissipation, which is provided with a plurality of ventilation openings on both sides of the box body, a fan is provided at one end of the box body, and heat dissipation plates are provided between the battery cells. Heat dissipation is completed through the cooperation of the fan, the heat dissipation plates and the ventilation openings.

[0003] This heat dissipation solution has certain limitations when applied to battery packs with a large number of battery cells. Specifically, as the number of battery cells increases, the air volume flowing through the battery cells on the side far from the fan will decrease, which may cause the temperature of the battery cells in this area to rise, thereby affecting the overall performance and service life of the battery pack. Therefore, for battery packs with a large number of large battery cells, the heat dissipation design may need to be further optimized to ensure the uniformity of the internal temperature of the battery pack. Summary of the Utility Model

[0004] The purpose of the utility model is to provide an air-cooled energy storage battery pack, which solves the problem of poor local heat dissipation efficiency caused by the increase in the number of battery cells, and improves the uniformity and efficiency of heat dissipation.

[0005] An air-cooled energy storage battery pack includes a box body, ventilation openings, a battery cell assembly and a fan located inside the box body. Heat dissipation plates and battery cells are provided inside the battery cell assembly. It is characterized in that the ventilation openings include side ventilation openings and top ventilation openings located on the upper side of the box body. The battery cell assemblies are multiple and are horizontally arranged in the direction of their own width. The fan is arranged on one side of the box body in the length direction of the battery cell assembly, and the side ventilation openings are arranged on two sides of the box body in the width direction of the battery cell assembly.

[0006] The suction effect of the fan inside the box causes the external air flow to enter the inside of the box through the side ventilation openings, and then be discharged outside the box through the fan, thereby forming an air flow circulation path. The heat dissipation plate is located inside the battery cell assembly. When the air flow passes through the heat dissipation plate, the heat inside the battery cells can be taken away to achieve heat dissipation. Multiple groups of the battery cell assemblies are arranged in parallel, which can effectively reduce the longitudinal dimension in the overall horizontal direction while increasing the number of battery cells. While optimizing the space layout, it can also improve the heat dissipation of the rear-row battery cells away from the fan in sequence, avoiding the problem that the air volume flowing through the rear-row battery cells is too small due to their far distance from the fan, which affects heat dissipation. At the same time, a top ventilation opening is added above the box. The newly added top ventilation opening can make the air flow form a relatively uniform flow field, improving the heat dissipation efficiency of the middle battery cell assembly. It can avoid the problem that the heat dissipation effect of the battery cell assembly located in the middle is poor due to its too far distance from the side ventilation opening.

[0007] Through reasonable layout optimization and adding the top ventilation opening, this air-cooled energy storage battery pack ensures the uniformity of the air flow passing through each battery cell while increasing the number of battery cells, prevents the phenomenon of too high temperature in local areas of the battery cells, and improves the overall heat dissipation performance of the battery pack.

[0008] As a preference of the present utility model, a ventilation air duct is provided between each group of the battery cell assemblies, and the fan is provided on the same side of each ventilation air duct.

[0009] The design of providing the fan on the same side of each ventilation air duct can further ensure the uniformity of the air flow inside the box passing through each battery cell, avoid the situation that the air flow rate in individual areas is small, and further improve the overall heat dissipation performance of the battery pack.

[0010] As a preference of the present utility model, a wind guiding pipe is provided between the fan and the ventilation air duct. The wind guiding pipe includes a plate body and a cavity located inside the plate body. The wind guiding pipe is internally communicated with the ventilation air duct, and the plate body is used to prevent the air flow from being directly drawn out of the battery pack by the fan without passing through the ventilation air duct.

[0011] The air inlet of the fan is wrapped by the wind guiding pipe and extends to the ventilation air duct, preventing the air from being directly drawn away by the fan through the gap without passing through the battery cells, forming an air flow short circuit.

[0012] As a preference of the present utility model, the cavity includes a diffuser section and an extension section. The extension section is internally communicated with the ventilation air duct, and one end of the diffuser section is connected to the fan and its pipe diameter increases along the air flow direction.

[0013] The design of the diffuser section can increase the flow velocity inside the ventilation duct without increasing the operating power of the fan, thereby improving the heat dissipation efficiency.

[0014] As a preference of the present invention, the plate body includes a mounting plate and a wind guiding plate. The mounting plate is connected to the fan, and the extending direction of the mounting plate is perpendicular to the extending direction of the wind guiding plate.

[0015] The connection between the mounting plate and the fan strengthens the stability of the connection.

[0016] As a preference of the present invention, a plurality of side ventilation openings are provided, and the quantity and positions thereof correspond to the heat dissipation plates. The inside of the heat dissipation plates is hollowed out, and air flow can enter the ventilation duct through the side ventilation openings and the heat dissipation plates.

[0017] External air flow can penetrate through the side ventilation openings into the inside of the heat dissipation plates and flow into the ventilation duct. The two ends are respectively communicated with the side ventilation openings and the inside of the ventilation duct, which can maximize the utilization of the surface area of the heat dissipation plates, increase the contact area between the air flow and the heat dissipation material, and thus improve the heat dissipation efficiency.

[0018] As a preference of the present invention, the ventilation volume of each side ventilation opening becomes larger along the direction away from the fan.

[0019] By adjusting the size of the ventilation openings, the air volume flowing through the heat dissipation plates is adjusted, avoiding local hot spots or cold spots in the battery cells, and ensuring that the temperature difference between the battery cells in the battery pack meets the specification requirements.

[0020] As a preference of the present invention, a plurality of heat dissipation strips with different shapes and sizes are provided inside the heat dissipation plates.

[0021] The design of the heat dissipation strips can not only increase the heat dissipation area, but also form a turbulent flow around, improve the convective heat transfer coefficient between the air and the heat dissipation plates, and strengthen the heat dissipation.

[0022] To sum up, the present invention has the following beneficial effects:

[0023] 1. Through reasonable layout optimization and adding the top ventilation openings, while increasing the number of battery cells, the uniformity of the air flow through each battery cell is ensured, preventing the phenomenon that the temperature of the battery cells in a local area is too high, and improving the overall heat dissipation performance of the battery pack.

[0024] 2. By adjusting the size of the ventilation openings, the air volume flowing through the heat dissipation plates is adjusted, avoiding local hot spots or cold spots in the battery cells, and ensuring that the temperature difference between the battery cells in the battery pack meets the specification requirements.

[0025] 3. The design of the heat dissipation fins can not only increase the heat dissipation area, but also form a turbulent flow around it, improve the convective heat transfer coefficient between the air and the heat dissipation plate, and enhance heat dissipation.

[0026] 4. The air inlet of the fan is wrapped by the air guide duct and extends to the ventilation duct, preventing the air from being directly drawn away by the fan through the gap without passing through the battery cells, thus forming an air flow short circuit. Description of the Drawings

[0027] Figure 1 is a schematic diagram of the external structure of the battery pack;

[0028] Figure 2 is a schematic diagram of the cross-sectional structure of the battery pack;

[0029] Figure 3 is a schematic diagram of the structure of the air guide duct;

[0030] Figure 4 is a schematic diagram of the plate structure of the air guide duct;

[0031] Figure 5 is a schematic diagram of the structure of the battery cell assembly;

[0032] Figure 6 is a schematic diagram of the structure of the heat dissipation plate;

[0033] Figure 7 is a schematic diagram of the side structure of the box body.

[0034] In the figure, 1. Box body, 2. Ventilation opening, 21. Top ventilation opening, 22. Side ventilation opening, 3. Battery cell assembly, 31. End plate, 32. Heat dissipation plate, 321. Heat dissipation fin, 33. Battery cell, 34. Steel strip, 4. Air guide duct, 41. Plate body, 411. Mounting plate, 412. Air guide plate, 42. Cavity, 421. Diffuser section, 422. Extension section, 5. Fan, 6. Ventilation duct. Detailed Implementation Manner

[0035] As Figure 1 、 2 shown, this air-cooled energy storage battery pack includes a box body 1, a top ventilation opening 21 above the box body 1, and a side ventilation opening 22 on the side of the box body. A fan 5 and a battery cell assembly 3 are located inside the box body. In this embodiment, the battery pack adopts a design of double fans + double ventilation ducts. There are three groups of battery cell assemblies 3, which are arranged side by side in the box body 1. A ventilation duct 6 is provided between each group of battery cell assemblies 3, and an air guide duct 4 is provided between the fan 5 and the ventilation duct 6. When the fan is started, the cooling air enters the inside of the box body 1 from the top ventilation opening 21 and the side ventilation opening 22 respectively. Figure 2The arrow direction in [description] is the gas flow direction. It can be seen that the external cold air evenly passes through the interior of each group of cell assemblies 3, and finally converges in the two ventilation ducts 6 respectively and is discharged outside the box through the air guide duct 4 by the fan 5, forming an air flow circulation path to take away the heat inside the cell assembly 3 to achieve heat dissipation.

[0036] As Figure 3 , 4 shown, the air guide duct 4 includes a plate body 41 and a cavity 42 located inside the plate body 41, and the air guide duct 4 is internally connected to the ventilation duct 6. The plate body 41 includes a mounting plate 411 and a wind guide plate 412. The mounting plate 411 is used for mounting and connecting with the fan 5, and the wind guide plate 412 is used to prevent the air flow from being directly drawn out of the battery pack by the fan without passing through the ventilation duct. The air inlet of the fan 5 is wrapped by the air guide duct and extends to the ventilation duct, so as to prevent the air from being directly drawn away by the fan 5 through the gap without passing through the cell 33, forming an air flow short circuit. The cavity 42 includes a diffuser section 421 and an extension section 422, the extension section 422 is internally connected to the ventilation duct 6, and the diameter of the diffuser section 421 decreases along the direction close to the ventilation duct. The design of the diffuser section 421 can increase the flow rate inside the ventilation duct 6 without increasing the operating power of the fan 5, thereby improving the heat dissipation efficiency.

[0037] As Figure 5 shown, a group of cell assemblies 3 is composed of a steel strip 34, end plates 31 and a plurality of cells 33. A silica gel strip is provided between the end plates 31 and the cells 33 to provide a compression buffer space between the end plates 31 and the cells 33, thereby playing a role in protecting the cells. A heat dissipation plate 32 is also provided between each cell 33. In this embodiment, as Figure 6 shown, the heat dissipation plate 32 can be selected as an aluminum sandwich air duct plate, which can support and fix the cell assembly 3, and is also beneficial to the heat dissipation of the cells 33. The heat of the cells 33 is transferred to the aluminum sandwich air duct plate 32 by heat conduction, and the heat is taken away by the air flowing through the aluminum sandwich air duct plate 32, thereby reducing the cell temperature. The aluminum sandwich air duct plate 32 can ensure that each cell 33 can be cooled by a relatively independent air duct, ensure that the temperature difference between different cells 33 in the battery pack is within the specified range, and improve the battery life. The heat dissipation strips 321 inside the aluminum sandwich air duct plate 32 can not only increase the heat dissipation area of the aluminum sandwich air duct plate 32, but also form a turbulent flow around the heat dissipation strips 321, improve the convective heat transfer coefficient between the air and the aluminum sandwich air duct plate 32, and enhance the heat dissipation.

[0038] As a preference of this embodiment, as Figure 7As shown, the adjacent side vents 22 are arranged at equal intervals, the centers of the vents 22 are at the same height, and the quantity and positions correspond to the aluminum sandwich air duct plates 32. And in the direction away from the fan, the caliber of the side vent 22 becomes larger. By adjusting the size of the side vent 22, the air resistance of the air duct is adjusted, so as to balance the air volume passing through the aluminum sandwich air duct plate 32, reduce the temperature difference of the battery cells in the battery pack, and the process is simple and the operation is convenient, with high economy. In addition, the side plate of the box body is fixedly connected to the box body 1 through the fastening hole, and the side plate is connected in a detachable form, which is convenient for disassembly and installation.

[0039] In the technical solution, the suction of the fan 5 in the box body 1 enables the external air flow to enter the box body 1 through the vent 2 and then be discharged out of the box body 1 through the fan 5, thus forming an air flow circulation path. A plurality of groups of the battery cell assemblies 3 are arranged in parallel, which can effectively reduce the overall longitudinal dimension while increasing the number of the battery cells 33, optimize the space layout and improve the heat dissipation of the rear battery cells 33, and avoid the problem that the air volume flowing through the battery cells 33 at the rear end is too small due to the long distance from the fan 5, which affects the heat dissipation. At the same time, the top vent 21 is added above the box body 1, and the newly added top vent 21 can make the air flow form a relatively uniform flow field, improving the heat dissipation efficiency of the middle battery cell assembly. The problem that the heat dissipation effect of the battery cell assembly in the middle is poor due to the long distance from the side vent 22 can be avoided.

[0040] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An air-cooled energy storage battery pack, comprising a box body (1), a ventilation opening (2), and a battery cell assembly (3) and a fan (5) located inside the box body (1). The battery cell assembly (3) is internally provided with a heat dissipation plate (32) and battery cells (33), and is characterized in that, The ventilation opening (2) includes side ventilation openings (22) and a top ventilation opening (21) located on the upper side of the box body (1). The battery cell assemblies (3) are multiple and arranged horizontally in their own width directions. The fan (5) is arranged on one side of the box body (1) in the length direction relative to the battery cell assemblies (3), and the side ventilation openings (22) are arranged on two sides of the box body (1) in the width direction relative to the battery cell assemblies (3).

2. The air-cooled energy storage battery pack according to claim 1, wherein A ventilation air duct (6) is provided between each group of the battery cell assemblies (3), and the fan (5) is provided on the same side of each ventilation air duct (6).

3. The air-cooled energy storage battery pack according to claim 2, characterized in that, A wind guide pipe (4) is provided between the fan (5) and the ventilation air duct (6). The wind guide pipe (4) includes a plate body (41) and a cavity (42) located inside the plate body (41). The wind guide pipe (4) is internally communicated with the ventilation air duct (6), and the plate body (41) is used to prevent the air flow from being directly drawn outside the battery pack by the fan (5) without passing through the ventilation air duct (6).

4. The air-cooled energy storage battery pack according to claim 3, wherein The cavity (42) includes a diffuser section (421) and an extension section (422). The extension section (422) is internally communicated with the ventilation air duct (6). One end of the diffuser section (421) is connected to the fan (5) and its pipe diameter increases along the air flow direction.

5. The air-cooled energy storage battery pack according to claim 3, wherein, The plate body (41) includes a mounting plate (411) and a wind guide plate (412). The mounting plate (411) is connected to the fan (5), and the extending direction of the mounting plate (411) is perpendicular to the extending direction of the wind guide plate (412).

6. An air-cooled energy storage battery pack according to any one of claims 2-5, characterized in that, A plurality of the side ventilation openings (22) are provided, and the quantity and positions thereof correspond to those of the heat dissipation plates (32). The inside of the heat dissipation plates (32) is hollowed out, and the air flow enters the ventilation air duct (6) through the side ventilation openings (22) and the heat dissipation plates (32).

7. An air-cooled energy storage battery pack according to any one of claims 1-5, characterized in that, The ventilation volume of each side ventilation opening (22) becomes larger along the direction away from the fan (5).

8. A forced-air-cooled energy storage battery pack according to any one of claims 1-5, characterized in that A plurality of heat dissipation strips (321) with different shapes and sizes are provided inside the heat dissipation plates (32).

Images