Battery pack and automobile

Abstract

The invention discloses a battery pack and an automobile. The battery pack comprises a cold plate, the cold plate is used for cooling a battery cell, a water inlet nozzle and a water outlet nozzle are arranged in the cold plate, the water inlet nozzle is used for inflow of cooling liquid, the water outlet nozzle is used for outflow of the cooling liquid, and the water inlet nozzle and the water outlet nozzle are arranged on the cooling surface of the cold plate. According to the battery pack, the integration level of the battery pack can be improved.

Description

Technical Field

[0001] The present invention relates to the field of automobiles, and more particularly, to a battery pack and an automobile equipped with such a battery pack. Background Art

[0002] Electric vehicles have great potential and advantages in energy conservation and emission reduction, and are attracting more and more attention. With the continuous improvement of battery energy density and fast charging requirements, the energy density of batteries is also getting higher and higher. As a result, there are challenges in the design of battery packs. Summary of the Invention

[0003] The present invention provides a battery pack that can improve the integration of the battery pack.

[0004] The battery pack according to one aspect of the present invention includes a cold plate for cooling the battery cells. An inlet nozzle and an outlet nozzle are provided in the cold plate. The inlet nozzle is for the inflow of the coolant, and the outlet nozzle is for the outflow of the coolant. The inlet nozzle and the outlet nozzle are provided on the cooling surface of the cold plate.

[0005] The battery pack according to one aspect of the present invention includes a plurality of cold plates extending longitudinally, and the cooling surfaces of the cold plates are perpendicular to the longitudinal direction.

[0006] The battery pack according to one aspect of the present invention, the inlet nozzle and the outlet nozzle are provided at the center of the cold plate.

[0007] The battery pack according to one aspect of the present invention, two coolant channels are symmetrically arranged in the cold plate, and each coolant channel starts from the central inlet nozzle, flows to the edge, and then returns to the central outlet nozzle.

[0008] The battery pack according to one aspect of the present invention, the battery pack further includes a main circuit water pipe, the main circuit water pipe includes a main inlet, a main outlet, a sub-inlet and a sub-outlet. The sub-inlet is connected to the inlet nozzle, and the sub-outlet is connected to the outlet nozzle.

[0009] The battery pack according to one aspect of the present invention, the cold plate includes a bearing part for bearing the battery cells.

[0010] The battery pack according to one aspect of the present invention, the cold plate includes a first cold plate and a second cold plate, and the bearing part is provided in the second cold plate.

[0011] The battery pack according to one aspect of the present invention, the second cold plate includes a fixing part for fixing to the battery pack tray.

[0012] The battery pack proposed according to an aspect of the present invention, the first cold plate and the second cold plate are made of different materials, and the elasticity of the first cold plate is less than that of the second cold plate.

[0013] In addition, the present invention proposes an automobile with such a battery pack. Since the automobile is equipped with the battery pack according to the present invention, it can have the advantages described above.

[0014] The beneficial effects of the present invention include: by arranging the water inlet nozzle and the water outlet nozzle of the cold plate on the cooling surface of the cold plate, the pipeline layout can be optimized, thereby improving the integration degree of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The disclosure of the present invention will be described with reference to the accompanying drawings. It should be understood that the drawings are only for the purpose of illustration and are not intended to limit the scope of protection of the present invention. In the drawings, unless otherwise specified, the same reference numerals are used to refer to the same components. Among them:

[0016] Figure 1 Schematically shows an exploded view of a battery pack proposed according to an embodiment of the present invention;

[0017] Figure 2 Schematically shows Figure 1 a part in

[0018] Figure 3 Schematically shows the first cold plate;

[0019] Figure 4 Schematically shows the second cold plate;

[0020] Figure 5 Schematically shows the connection mode between the second cold plate and the battery pack tray;

[0021] Figure 6 Schematically shows the layout relationship between the cold plate and the battery pack tray;

[0022] Figure 7 Schematically shows the layout relationship between the first cold plate, the second cold plate and the battery cells. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] It is easy to understand that according to the technical solution of the present invention, without changing the essence of the present invention, those of ordinary skill in the art can propose various interchangeable structural forms and implementation methods. Therefore, the following detailed embodiments and the accompanying drawings are only exemplary descriptions of the technical solution of the present invention, and should not be regarded as the whole of the present invention or as a limitation or restriction on the technical solution of the present invention.

[0024] According to an embodiment of the present invention in combination with Figures 1-7As shown. The battery pack includes a cold plate 5 for cooling the battery cells 6. An inlet nozzle 5A and an outlet nozzle 5B are provided in the cold plate. The inlet nozzle is for the inflow of the coolant, and the outlet nozzle is for the outflow of the coolant. The inlet nozzle and the outlet nozzle are provided on the cooling surface of the cold plate. The cooling surface of the cold plate faces the battery cells for cooling the battery cells, which corresponds to the YZ plane of the vehicle here. In addition, the battery pack further includes an upper cover assembly 1, a high-voltage copper busbar 2, an ICB assembly 3, a battery pack tray 7, a bottom protection assembly 8, and a high-low voltage integration assembly 9.

[0025] In this embodiment, by arranging the inlet nozzle and the outlet nozzle of the cold plate on the cooling surface of the cold plate (instead of arranging them on the edges of the cold plate, corresponding to the left and right sides in Figure 3 ), the pipeline layout can be optimized, thereby improving the integration degree of the battery pack. The inlet nozzle and the outlet nozzle of the cold plate can be arranged to be aligned in the vertical direction, thereby further improving the integration degree of the battery pack.

[0026] In addition, by arranging the inlet nozzle and the outlet nozzle of the cold plate on the cooling surface of the cold plate, leakage caused by collision of the inlet nozzle, the outlet nozzle, and the corresponding coolant pipelines can be effectively prevented, thereby improving the safety of the battery pack.

[0027] The battery pack includes a plurality of cold plates extending along the longitudinal direction (corresponding to the X direction of the vehicle), and the cooling surfaces of the cold plates are perpendicular to the longitudinal direction. The battery cells are located between two adjacent cold plates.

[0028] The inlet nozzle and the outlet nozzle are provided at the center of the cold plate, such as the horizontal symmetry center. Two coolant flow channels are symmetrically arranged in the cold plate. Each coolant flow channel starts from the central inlet nozzle, flows to the edge, and then returns to the central outlet nozzle. Each coolant flow channel is generally configured as a U shape, for example. The battery cells are respectively provided on both sides of the center of the cold plate. Compared with the solution where the coolant flow channels extend horizontally as a whole due to the inlet nozzle and the outlet nozzle being arranged on both sides of the cold plate, the battery cells provided on both sides of the center of the cold plate can be cooled evenly.

[0029] Refer to Figure 2 As shown, the battery pack further includes a main loop water pipe, which includes a main inlet 42, a main outlet 41, a sub-inlet, and a sub-outlet. The sub-inlet is connected to the inlet nozzle, and the sub-outlet is connected to the outlet nozzle. The main inlet and the main outlet are part of the main coolant loop. The inlet nozzle and the outlet nozzle of each cold plate respectively correspond to a sub-inlet and a sub-outlet. For example, the main loop water pipe distributes the coolant to each cold plate through a tee joint 43 with different inner diameters. The main loop water pipe forms part of the cooling system 4.

[0030] Since the water inlet and outlet nozzles of the cold plate are arranged at the center of the cold plate, the main circuit water pipe is also arranged at the center, which can improve the integration efficiency of the system, the safety in extreme cases such as side collisions, and the space utilization rate.

[0031] The cold plate includes a bearing part for bearing the battery cells. There is no need to set up an additional bearing structure below the battery pack tray to bear the battery cells, which can also reduce the overall weight of the battery pack. The bearing part is, for example, configured as a flanging that supports the battery cells from below.

[0032] Specifically, the cold plate includes a first cold plate 44 and a second cold plate 45, and the bearing part is arranged in the second cold plate. The connecting water pipe 46 connects the front and rear first cold plates and the second cold plate. Additionally, glue can be provided between the cooling surface of the second cold plate and the battery cells for auxiliary fixation. As shown in the reference Figure 7 figure, bearing parts are arranged on both longitudinal sides of each second cold plate. Each second cold plate can bear two rows of battery cells, and the first cold plate and the second cold plate are arranged alternately longitudinally.

[0033] Furthermore, the second cold plate includes a fixing part for fixing to the battery pack tray. As shown in the reference Figure 5 figure, the fixing part is, for example, configured as a flanging 451 at the edge of the second cold plate 45, and is fixed to the battery pack side frame 71 of the battery pack tray 7 through bolts 47. Thus, the battery cells are indirectly borne by the battery pack tray through the second cold plate. There is no need to additionally set a cooling plate at the bottom of the battery cells, and the battery cells rely on the second cold plate for support, ensuring that the overall structure strength and mode of the whole pack meet the requirements. The second cold plate and the battery pack tray are connected together by bolts to form an integral body, improving the overall structure strength of the whole pack and ensuring the side collision performance.

[0034] The first cold plate and the second cold plate are made of different materials. The elasticity / strength / stiffness of the first cold plate is less than that of the second cold plate. The first cold plate is particularly adapted to the expansion of the battery cells, and the second cold plate is particularly suitable for bearing the battery cells.

[0035] The first cold plate is made of, for example, a corrugated tube or other materials and contains a coolant flow channel inside. The first cold plate will be extruded and deformed after being stressed, and can be used for releasing the expansion force between the battery cells.

[0036] The second cold plate is made of, for example, a material with a certain strength, which plays the role of bearing the battery cells and can also be used for releasing the expansion force between the battery cells.

[0037] The present invention also includes an automobile with a battery pack of any one or more of the foregoing embodiments. Therefore, the technical features and technical effects thereof are corresponding to the previous description and will not be elaborated herein.

[0038] The technical scope of the present invention is not limited to the content described above. Those skilled in the art can make various deformations and modifications to the above embodiments without departing from the technical idea of the present invention, and these deformations and modifications should all fall within the protection scope of the present invention.

Claims

1. A battery pack, characterized in that, The battery pack includes a cold plate for cooling the battery cells. An inlet nozzle and an outlet nozzle are provided in the cold plate. The inlet nozzle is for the inflow of the coolant, and the outlet nozzle is for the outflow of the coolant. The inlet nozzle and the outlet nozzle are arranged on the cooling surface of the cold plate.

2. The battery pack according to claim 1, characterized in that, The battery pack includes a plurality of cold plates extending along the longitudinal direction, and the cooling surfaces of the cold plates are perpendicular to the longitudinal direction.

3. The battery pack according to claim 1, characterized in that, The inlet nozzle and the outlet nozzle are arranged at the center of the cold plate.

4. The battery pack according to claim 3, characterized in that, Two coolant channels are symmetrically arranged in the cold plate. Each coolant channel starts from the central inlet nozzle, flows towards the edge, and then returns to the central outlet nozzle.

5. The battery pack according to claim 1, wherein, The battery pack further includes a main circuit water pipe, which includes a main inlet, a main outlet, a sub-inlet, and a sub-outlet. The sub-inlet is connected to the inlet nozzle, and the sub-outlet is connected to the outlet nozzle.

6. The battery pack according to claim 1, characterized in that, The cold plate includes a bearing portion for bearing the battery cells.

7. The battery pack according to claim 6, wherein, The cold plate includes a first cold plate and a second cold plate, and the bearing portion is arranged in the second cold plate.

8. The battery pack according to claim 7, wherein, The second cold plate includes a fixing portion for fixing to the battery pack tray.

9. The battery pack according to claim 7, characterized in that, The first cold plate and the second cold plate are made of different materials, and the elasticity of the first cold plate is less than that of the second cold plate.

10. A vehicle, characterized in that, It includes a battery pack according to any one of claims 1 to 9.

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