Novel integrated die-casting battery shell structure

Abstract

The utility model discloses a novel integrated die-casting battery shell structure which comprises an integrated aluminum alloy die-casting ring shell and an integrated liquid flow bottom groove plate, the integrated liquid flow bottom groove plate is connected and installed at the bottom of the integrated aluminum alloy die-casting ring shell, and a cooling liquid groove is formed in the bottom of the integrated liquid flow bottom groove plate. A cooling liquid groove is formed in the integrated aluminum alloy die-casting ring shell, a die-casting double-flow-channel blocking strip set is installed in the cooling liquid groove, a back side protection plate fixedly covers the back side of the integrated liquid flow bottom groove plate, the top of the integrated aluminum alloy die-casting ring shell is connected with an integrated top edge ring, a liquid inlet and outlet hole is formed in the groove wall of the cooling liquid groove, and a liquid inlet and outlet pipe is installed on the outer side hole edge of the liquid inlet and outlet hole. The battery shell has the beneficial effects that the integrated die-casting structure enables the shell structure to be more compact and high in strength, electrolyte in the battery can be effectively prevented from leaking, the safety of the battery is improved, the production procedures and time are greatly reduced, the production efficiency can be improved by multiple times, and the lightweight design is beneficial to improving the endurance mileage and the energy efficiency of new energy equipment.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a novel integrated die casting battery shell structure. BACKGROUND

[0002] The booming development of new energy industry continuously improves the requirement of battery performance, and the rationality, reliability and performance of the structure of the battery shell as the key part of protecting the internal components of the battery directly affect the overall performance of the battery. In new energy vehicles and energy storage equipment, the safety, endurance and cost control of the battery are crucial factors for consideration, and the current common battery shell has the following shortcomings:

[0003] The traditional shell needs multiple processes to stamp the metal plate into different shaped parts, and then weld and assemble, this structure not only has the process lock, low production efficiency, but also is prone to material deformation and stress concentration in the stamping process, and the welding part has potential sealing problems and the risk of strength reduction, because the heat affected zone is generated in the welding process, which may cause the change of material performance;

[0004] When connecting multiple parts, the welding quality is difficult to ensure uniformity, and defects such as blowhole and slag inclusion may occur in the welding process, affecting the sealing and strength of the shell, in addition, welding needs to consume a lot of time and manpower, increasing the production cost;

[0005] Although the current commonly used steel and other materials have certain strength, they are heavy, which is not conducive to improving the endurance and energy efficiency of new energy equipment, and although aluminum alloy material has lighter weight and good thermal conductivity, its strength and sealing cannot meet the requirements of high-performance batteries under the traditional manufacturing process. UTILITY MODEL CONTENTS

[0006] The utility model aims at solving the above problems and provides a novel integrated die casting battery shell structure.

[0007] The utility model realizes the above-mentioned purposes through the following technical solutions:

[0008] A novel integrated die casting battery shell structure, comprising an integrated aluminum alloy die casting ring shell and an integrated liquid flow bottom groove plate, the integrated liquid flow bottom groove plate is connected and installed at the bottom of the integrated aluminum alloy die casting ring shell, the bottom of the integrated liquid flow bottom groove plate is provided with a cooling liquid groove, a die casting double-flow channel baffle group is installed in the inside of the cooling liquid groove, a back side protection plate is arranged on the back side cover of the integrated liquid flow bottom groove plate, an integrated top edge ring is connected to the top of the integrated aluminum alloy die casting ring shell, an inlet and outlet liquid hole is arranged on the groove wall of the cooling liquid groove, and an inlet and outlet liquid pipe is arranged on the outside hole of the inlet and outlet liquid hole.

[0009] Further, the die-casting double-flow barrier group is composed of a plurality of alternately arranged side barriers and opposite barriers, and an intermediate barrier is arranged in the cooling liquid groove between two adjacent side barriers and opposite barriers.

[0010] Further, the inlet and outlet liquid pipe is an L-shaped pipe, the integrated aluminum alloy die-casting ring shell is provided with a pipe limiting hole, and the pipe end of the inlet and outlet liquid pipe extends to the outside of the integrated aluminum alloy die-casting ring shell through the pipe limiting hole.

[0011] Further, the integrated aluminum alloy die-casting ring shell is provided with a connector insertion hole, an explosion-proof valve insertion hole and a communication interface.

[0012] Further, the back side protection plate is welded to the bottom of the integrated liquid flow bottom groove plate.

[0013] Further, the ring body of the integrated top ring is provided with a plurality of evenly arranged ring fixing holes.

[0014] The beneficial effects of the utility model lie in that the integrated die-casting structure makes the shell structure more compact, the connection between various parts is more firm, the strength of the shell is significantly improved due to the absence of welding joints, the shell can better bear the pressure of the internal battery assembly and external impact, meanwhile, good sealing can effectively prevent the leakage of electrolyte in the battery, and the safety of the battery is improved.

[0015] The production process and time are greatly reduced, and compared with the traditional structure, the production efficiency can be improved by several times.

[0016] Lightweight design helps to improve the endurance mileage and energy efficiency of new energy equipment. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is the structure of the novel integrated die-casting battery shell structure Figure 1 ;

[0018] Figure 2 is the structure of the novel integrated die-casting battery shell structure Figure 2 ;

[0019] Figure 3 is the split structure diagram of the novel integrated die-casting battery shell structure.

[0020] Figure 4 is the internal view of the cooling liquid groove of the novel integrated die-casting battery shell structure.

[0021] The reference signs are explained as follows:

[0022] 1. One-piece die-cast aluminum alloy ring shell; 2. One-piece liquid flow bottom plate; 3. Inlet and outlet pipes; 4. Connector socket; 5. Explosion-proof valve socket; 6. Communication interface; 7. Reinforcing rib; 8. One-piece top edge ring; 9. Edge ring fixing hole; 10. Back side protective plate; 11. Coolant tank; 12. Die-cast double flow channel baffle assembly; 13. Inlet and outlet holes; 14. Side baffle; 15. Middle baffle; 16. Opposite side baffle. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings:

[0024] like Figures 1-4 As shown, a novel integrated die-cast battery casing structure includes an integrated aluminum alloy die-cast ring shell 1 and an integrated liquid flow bottom groove plate 2.

[0025] The integrated liquid flow bottom plate 2 is connected and installed at the bottom of the integrated aluminum alloy die-cast ring shell 1. The integrated aluminum alloy die-cast ring shell 1 and the integrated liquid flow bottom plate 2 are formed by integrated die casting process, and high-strength and corrosion-resistant aluminum alloy materials such as A356, 6061, and 7075 are selected. The performance of the materials is improved by optimizing the alloy composition and heat treatment process.

[0026] The bottom of the integrated liquid flow bottom plate 2 is provided with a coolant tank 11. The coolant tank 11 is integrally formed with the die casting process. The coolant tank 11 is equipped with a die casting dual flow channel baffle group 12, which forms a dual flow channel design inside, which can fully remove the heat generated by the battery cell and prevent the battery cell from thermal failure. The die casting dual flow channel baffle group 12 is also integrally formed with the die casting process.

[0027] The back side fixing cover of the integrated liquid flow bottom plate 2 is equipped with a back side protective plate 10 to prevent liquid from flowing out;

[0028] The top of the integrated aluminum alloy die-cast ring shell 1 is connected to an integrated top edge ring 8, which facilitates the stacking and installation of multiple battery packs and can also be used to fix the cover.

[0029] The coolant tank 11 has two inlet and outlet holes 13 on its tank wall, which are used for the inflow and outflow of coolant liquid respectively. Inlet and outlet pipes 3 are installed on the outer edge of the inlet and outlet holes 13 to facilitate connection to external coolant liquid input and output pipes, so as to realize the circulation of coolant liquid in the dual flow channels.

[0030] like Figures 1-4 As shown, this utility model also discloses the following more optimized specific structures:

[0031] The die-casting dual-flow channel baffle group 12 consists of several alternately arranged side baffles 14 and opposite baffles 16. An intermediate baffle 15 is provided in the coolant tank 11 between two adjacent side baffles 14 and opposite baffles 16, thereby realizing its dual-flow channel design. The side baffles 14, opposite baffles 16 and intermediate baffles 15 are all arranged in parallel.

[0032] The inlet / outlet pipe 3 is an L-shaped pipe, and the integral aluminum alloy die-cast ring shell 1 is provided with a pipe limiting hole. The pipe port of the inlet / outlet pipe 3 extends to the outside of the integral aluminum alloy die-cast ring shell 1 through the pipe limiting hole.

[0033] The integrated aluminum alloy die-cast ring shell 1 is provided with connector socket 4, explosion-proof valve socket 5 and communication interface 6, which are used to install connectors, explosion-proof valves and realize communication of the battery cells.

[0034] The back protective plate 10 is welded to the bottom of the integrated liquid flow bottom plate 2 using friction stir welding, resulting in high welding quality, good joint performance, and minimal welding thermal deformation, thus providing the box with higher precision.

[0035] The integrated top edge ring 8 has several evenly arranged edge ring fixing holes 9 on its ring body. The edge ring fixing holes 9 facilitate the installation of bolts, allowing it to be stacked or used to install a top cover.

[0036] like Figures 1-4 The novel integrated die-cast battery casing structure shown is formed by friction stirring welding of the bottom back protective plate 10 and the integrated liquid flow bottom tank plate 2. Through special path design, a special flow channel is formed inside after welding to allow the refrigerant liquid to flow.

[0037] The integrated aluminum alloy die-cast ring shell 1 and the integrated liquid flow bottom plate 2 are formed by integrated die-casting process. After die-casting, the shell undergoes subsequent processing, such as deburring and surface treatment, to improve the appearance quality and corrosion resistance of the shell. The connector socket, explosion-proof valve socket, and communication interface are machined in one sequence by a gantry five-axis machining center after die-casting, ensuring the relative positional accuracy of the sealing surface mounting holes and the installation positions of the connector socket, explosion-proof valve socket, and communication socket. The inlet and outlet are machined into bottom holes by the body and then welded with metal water pipes to connect them to the dual flow channels. Air tightness testing ensures that there are no air leaks inside the box.

[0038] Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of this utility model as claimed.

Claims

1. A novel one-piece die-cast battery case structure, characterized by: The integrated aluminum alloy die-casting ring shell and the integrated liquid flow bottom groove plate are connected and installed at the bottom of the integrated aluminum alloy die-casting ring shell, the bottom of the integrated liquid flow bottom groove plate is provided with a cooling liquid groove, the inside of the cooling liquid groove is provided with a die-casting double-flow channel baffle group, the back side fixed cover of the integrated liquid flow bottom groove plate is provided with a back side protection plate, the top of the integrated aluminum alloy die-casting ring shell is connected with an integrated top edge ring, the groove wall of the cooling liquid groove is provided with an inlet and outlet liquid hole, and the outside hole of the inlet and outlet liquid hole is provided with an inlet and outlet liquid pipe.

2. A novel one-piece die-cast battery case structure according to claim 1, characterized by: The die-casting double-flow channel baffle group is composed of a plurality of alternately arranged side baffles and opposite baffles, and an intermediate baffle is arranged in the cooling liquid groove between adjacent two side baffles and opposite baffles.

3. A novel one-piece die-cast battery case structure according to claim 1, characterized by: The inlet and outlet liquid pipe is an L-shaped pipe, the integrated aluminum alloy die-casting ring shell is provided with a pipe limiting hole, and the pipe end of the inlet and outlet liquid pipe extends to the outside of the integrated aluminum alloy die-casting ring shell through the pipe limiting hole.

4. A novel one-piece die-cast battery case structure according to claim 1, characterized by: The integrated aluminum alloy die-casting ring shell is provided with a connector insertion hole, an explosion-proof valve insertion hole and a communication interface.

5. A novel one-piece die-cast battery case structure according to claim 1, characterized by: The back side protection plate is welded to the bottom of the integrated liquid flow bottom groove plate.

6. A novel one-piece die cast battery case structure according to claim 1, characterized by: The ring body of the integrated top edge ring is provided with a plurality of uniformly arranged edge ring fixed holes.

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