Power battery temperature control chassis integrated structure

Abstract

According to the integrated structure of the temperature control chassis of the power battery provided by the utility model, integrated forming of a metal inner runner is realized through a stirring friction tunnel forming technology, the torsional rigidity of a battery tray is improved, and the structure is simplified, so that the safety performance of a battery pack can be maintained while a double-sided runner can be formed; the sensitive temperature control of the power battery is realized by utilizing the characteristic of more sensitive heat transfer of the battery tray, and the working safety of the battery is improved. The temperature control chassis comprises a temperature control chassis body and a battery tray, and further comprises a battery pack, a groove is formed in the upper surface of the temperature control chassis body, the battery tray is arranged at a notch of the groove, and a sealed cavity is formed by the lower surface of the battery tray and the interior of the groove; the outer surfaces of the battery packs are coated with structural adhesive, the battery packs are fixedly arranged in the battery tray at equal intervals, one side of the battery tray is provided with a battery unit assembling face, the battery unit assembling face is arranged towards the temperature control chassis body, and the battery unit assembling face and the temperature control chassis body are arranged in a stirring friction welding mode.

Description

Technical Field

[0001] The utility model relates to an integrated structure of a temperature control chassis for a power battery, specifically belonging to the technical field of new energy vehicle chassis. Background Art

[0002] The integrated design of the battery liquid cooling system and the battery tray is a current solution for manufacturing lightweight battery trays, replacing the design of an external cooling system and improving the heat transfer efficiency of the battery; however, since the battery pack still needs to be fixed to the vehicle chassis later, different components need to be spliced by methods such as welding, with complex processes, not meeting the requirements of lightweight design and also increasing the weight of the vehicle body;

[0003] With the continuous development of new energy vehicles towards the direction of integration, by canceling the upper cover of the battery pack and integrating the battery pack with the vehicle chassis, further lightweighting is achieved; however, the simpler battery packaging design leads to a decrease in the safety performance of the battery pack; at the same time, this measure does not bring an improvement in the heat transfer efficiency of the battery. Summary of the Utility Model

[0004] The purpose of the utility model is to provide an integrated structure of a temperature control chassis for a power battery, so as to provide a new energy vehicle with a chassis and battery pack integrated structure that is safe and has a higher heat transfer efficiency, and to solve the problems that the existing battery structure cannot have both safety and lightweight, and it is difficult to improve the heat transfer efficiency.

[0005] To solve the above technical problems, the technical solution adopted by the utility model is: the new type includes a temperature control chassis body and a battery tray, and also includes a battery pack. A groove is provided on the upper surface of the temperature control chassis body, the battery tray is arranged at the notch of the groove, and a sealed cavity is formed between the lower surface of the battery tray and the inside of the groove;

[0006] Furthermore, the installation of the battery pack is completed through the sealed cavity, improving the safety of the battery pack during use.

[0007] A structural adhesive is coated on the outer surface of the battery pack, and the battery packs are fixedly arranged in the battery tray at equal intervals. One side of the battery tray facing the groove is provided with a battery unit assembly surface, and the edge of the battery unit assembly surface is welded to the notch of the groove through friction stir welding;

[0008] Furthermore, by performing friction stir welding on the battery tray and the temperature control chassis body to form a sealed cavity, it is convenient for subsequent installation of the battery pack, and the stability of the battery pack installation is improved through the structural adhesive.

[0009] The inner bottom surface of the groove is provided with a contact surface, and a thermal conductive silicone grease is coated on the contact surface;

[0010] Furthermore, the high-efficiency heat transfer between the battery pack and the temperature control chassis body is ensured through the thermal conductive silicone grease.

[0011] One side of the battery tray facing away from the groove is provided with a floor surface, and the lower surface of the temperature control chassis body is provided with a heat dissipation surface;

[0012] Furthermore, coaxial ultrasonic assisted friction stir tunnel forming forms cross-flow channels under the condition of water immersion cooling, and the turning points of the channels adopt fillet transitions with a fillet radius of 3 mm; the battery tray and the inner side of the temperature control chassis body are cooperated by a coaxial ultrasonic friction stir tunnel forming tool to form a sealed cavity for installing the battery pack.

[0013] The floor surface is provided with a T inner flow channel group, and the heat dissipation surface is provided with a B inner flow channel group. A first coolant inlet and a first coolant inlet are respectively arranged on the left and right sides in the T inner flow channel group, and a second coolant inlet and a second coolant outlet are respectively arranged on the left and right sides in the B inner flow channel group;

[0014] Furthermore, through the cooperation of the first coolant inlet, the first coolant inlet, the second coolant inlet and the second coolant outlet, the T inner flow channel group and the B inner flow channel group are cooled by water immersion throughout the process, avoiding high-temperature damage to the battery pack.

[0015] A coaxial ultrasonic friction stir tunnel forming tool is arranged above the temperature control chassis body;

[0016] Furthermore, the floor surface and the heat dissipation surface are both set by coaxial ultrasonic friction stir tunnel forming through the coaxial ultrasonic friction stir tunnel forming tool.

[0017] The beneficial effects of the present utility model are:

[0018] 1. By placing the battery pack on the vehicle chassis and using the battery tray as a cover plate, the battery tray becomes the floor of the vehicle interior, highly integrating the vehicle chassis and the battery structure.

[0019] 2. By introducing the friction stir tunnel forming technology, the battery tray abandons the original manufacturing method of "machining the flow channel and welding the cover plate", realizes the integrated forming of the metal inner flow channel, improves the torsional stiffness of the battery tray, simplifies the structure, and enables the formation of double-sided flow channels while maintaining the safety performance of the battery pack; the double-sided flow channel means more efficient and sensitive heat transfer, extending from the original liquid cooling module to the "temperature control" of the battery tray, and realizing the sensitive temperature control of the power battery by utilizing the more sensitive heat transfer characteristics of the battery tray, improving the working safety of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is an exploded view structural schematic diagram of the temperature control chassis body of the present utility model;

[0021] Figure 2 is a schematic diagram of the inner flow channel forming of the temperature control chassis body of the present utility model;

[0022] Figure 3 is a schematic cross-sectional view of the temperature control chassis body of the present utility model;

[0023] Figure 4 is a schematic cross-sectional view of the coaxial ultrasonic friction stir tunnel forming tool of the present utility model;

[0024] Figure 5 is a schematic top view of the internal flow path of the present utility model. Specific embodiments

[0025] Next, the technical solutions in the embodiments will be described clearly and completely in conjunction with the attached Figures 1-5 , as shown in Figures 1-3 , the bottom of the new energy vehicle is composed of a temperature control chassis body 10, a battery tray 20 and a battery pack 30. A sealed cavity 11 is formed inside the groove provided on the upper surface of the temperature control chassis body 10 through the lower surface of the battery tray 20 for installing the battery pack 30, and the battery pack 30 is protected;

[0026] By applying structural adhesive to the outer surface of the battery pack 30 and arranging it in a regular and close-packed manner on the battery tray 20, the battery pack 30 can be safely and stably installed in the sealed cavity 11 between the temperature control chassis body 10 and the battery tray 20. The contact surface 12 on one side of the temperature control chassis body 10 and the battery pack 30 is coated with thermal conductive silicone grease, and the high-efficiency heat transfer between the battery pack 30 and the temperature control chassis body 10 is ensured through the thermal conductive silicone grease;

[0027] As shown in Figures 4-5 , the floor surface 22 on one side of the battery tray 20 and the heat dissipation surface 13 on one side of the temperature control chassis body 10 are respectively subjected to coaxial ultrasonic friction stir tunnel forming, so that a T internal flow path group 221 is formed inside the floor surface 22, and a B internal flow path group 131 is formed inside the heat dissipation surface 13. Among them, the coaxial ultrasonic friction stir tunnel forming tool 40; the application of ultrasonic assistance reduces the material flow stress to adapt to the poor plasticity of the one-piece die-cast aluminum alloy chassis. The whole process of the friction stir tunnel forming process is water-cooled to avoid high-temperature damage to the battery;

[0028] Among them, a first coolant inlet 222 and a first coolant outlet 223 are respectively arranged on the left and right sides inside the T internal flow path group 221, and a second coolant inlet and a second coolant outlet 133 are respectively arranged on the left and right sides inside the B internal flow path group 131; thus, the T internal flow path group 221 and the B internal flow path group 131 can be fully immersed in water;

[0029] The temperature control chassis body 10 and the battery tray 20 are used as anodes and placed in a corresponding electrolyte (such as sulfuric acid, chromic acid, oxalic acid, etc.). Under specific conditions and the action of an applied current, electrolysis is carried out to form an oxide film on their surfaces, thereby protecting the temperature control chassis body 10 and the battery tray 20, improving the overall protection of the chassis, and the integrated structure of the temperature control chassis body 10 improves the stability of the overall chassis structure.

[0030] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments by using the disclosed technical content within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention, any simple modification, equivalent replacement, and improvement made to the above embodiments within the spirit and principle of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. An integrated structure of a temperature-controlled chassis for a power battery, comprising a temperature-controlled chassis body (10) and a battery tray (20), characterized in that, It further includes a battery pack (30). A groove is provided on the upper surface of the temperature-controlled chassis body (10). A battery tray (20) is arranged at the notch of the groove, and a sealed cavity (11) is formed between the lower surface of the battery tray (20) and the interior of the groove.

2. The integrated structure of a power battery temperature control chassis according to claim 1, characterized in that The outer surface of the battery pack (30) is coated with structural adhesive, and the battery packs (30) are fixedly arranged in the battery tray (20) at equal intervals. One side of the battery tray (20) facing the groove is provided with a battery cell assembly surface (21), and the edge of the battery cell assembly surface (21) is joined to the notch of the groove by friction stir welding.

3. The integrated structure of a power battery temperature control chassis according to claim 1, wherein, The inner bottom surface of the groove is provided with a contact surface (12), and thermal conductive silicone grease is coated on the contact surface (12).

4. The integrated structure of a power battery temperature control chassis according to claim 1, wherein One side of the battery tray (20) facing away from the groove is provided with a floor surface (22), and the lower surface of the temperature-controlled chassis body (10) is provided with a heat dissipation surface (13).

5. The integrated structure of a power battery temperature control chassis according to claim 4, wherein, A T internal flow channel group (221) is arranged inside the floor surface (22), and a B internal flow channel group (131) is arranged inside the heat dissipation surface (13). A first coolant inlet (222) and a first coolant outlet (223) are respectively arranged on the left and right sides inside the T internal flow channel group (221), and a second coolant inlet and a second coolant outlet (133) are respectively arranged on the left and right sides inside the B internal flow channel group (131).

6. The integrated structure of a power battery temperature control chassis according to claim 1, wherein, A coaxial ultrasonic friction stir tunneling forming tool (40) is arranged above the temperature-controlled chassis body (10).

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