High-strength liquid-cooled battery box

Abstract

The utility model relates to the technical field of power batteries, and discloses a high-strength liquid-cooled battery box body which comprises a liquid-cooled plate, and a left frame, a right frame, a front edge beam and a rear frame which are arranged on the periphery of the liquid-cooled plate, a front blocking plate and a rear cross beam are fixedly arranged on the front side and the rear side of the liquid cooling plate through friction welding respectively; the liquid cooling plate is internally provided with a liquid cooling flow channel through which cooling liquid flows; bearing bosses are arranged at the two ends of the front plugging plate; a front cross beam, an accessory mounting block and a water inlet and outlet nozzle are integrated on the upper surface of the front plugging plate in a die-casting integrated molding manner; and four corners of the liquid cooling flow channel are blocked by brazing. The utility model has the advantages of higher structural integration, convenience in assembly and higher structural stability.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, in particular to a high-strength liquid-cooled battery box. Background Art

[0002] As the core component of new energy vehicles, power batteries are the main power source of new energy vehicles. During the charging and discharging process, power batteries will first convert chemical energy into electrical energy, and then convert electrical energy into kinetic energy. In the process of energy conversion, a large amount of heat energy will be generated. When the heat energy cannot be released in time, the temperature around the power battery will rise, thereby affecting the physical stability of the lithium battery and reducing its performance.

[0003] In order to achieve heat management and dissipate the heat of the battery in time, a liquid cooling system is usually provided on the battery case of the power battery. Common liquid cooling systems include separately assembled liquid cooling systems and liquid cooling systems integrated on the battery case. Among them, the integrated liquid cooling system can save space, reduce weight, and reduce production costs, and is currently the more commonly used type of liquid cooling system. The integrated liquid cooling system includes a liquid cooling case, the main structure of which includes a liquid cooling plate and a liquid cooling flow channel deployed on the back. Usually, welding processes are used at both ends of the liquid cold plate to seal and block the flow channel. At the same time, fixing points for fixing the battery module are welded on the surface of the liquid cold plate.

[0004] In conventional processing, such boxes are usually made of aluminum extrusions connected by stir friction welding and arc welding. However, due to the integrated liquid cooling structure, the overall structure is relatively complex and has many components, resulting in a large amount of structural processing and a large number of parts welding steps. There are many welds, large thermal deformation, and insufficient weld strength. In addition, the arc welding on the bottom liquid cooling plate is very easy to penetrate, resulting in the risk of liquid leakage, and it is not easy to detect the leak point and difficult to repair. Utility Model Content

[0005] The utility model aims to provide a high-strength liquid-cooled battery box with high structural integration, easy assembly and strong structural stability.

[0006] The basic scheme provided by the utility model is: a high-strength liquid-cooled battery box, comprising a liquid-cooling plate and a left frame, a right frame, a front side beam and a rear frame arranged around the liquid-cooling plate; the front and rear sides of the liquid-cooling plate are respectively fixed with a front blocking plate and a rear cross beam by friction welding; a liquid-cooling flow channel for the circulation of coolant is provided in the liquid-cooling plate; load-bearing bosses are provided at both ends of the front blocking plate; the upper surface of the front blocking plate is also integrated with a front cross beam, an accessory mounting block and an inlet and outlet water nozzle by die-casting; the four corners of the liquid-cooling flow channel are blocked by brazing.

[0007] Furthermore, a positioning and limiting structure for positioning the front side beam is provided on the front side surface of the accessory mounting block.

[0008] Furthermore, the positioning and limiting structure is a rectangular protrusion; and the front side beam is provided with a limiting slot matching the rectangular protrusion.

[0009] Furthermore, the left frame and the right frame are fixedly connected to the liquid cooling plate by positive and negative friction welding.

[0010] Furthermore, a plurality of weight-reducing grooves are provided on the lower surface of the front blocking plate.

[0011] Furthermore, the lower surface of the front blocking plate is also provided with inlet and outlet flow channel grooves.

[0012] Furthermore, it also includes a flow channel blocking plate; the flow channel blocking plate is arranged at the inlet and outlet flow channel grooves.

[0013] Furthermore, a first chamfer is provided at the junction of the upper surface and the left side of the rear cross beam; and a second chamfer is provided at the junction of the lower surface and the right side of the rear cross beam.

[0014] Furthermore, the rear frame includes a side panel and a bottom panel that are integrally connected; and a rear blocking block is integrally provided on the bottom panel.

[0015] Furthermore, a first limiting protrusion matching the first chamfer of the rear cross beam is provided on the lower portion of the side plate of the rear frame; and a second limiting protrusion matching the second chamfer of the rear cross beam is provided on the upper surface of the bottom plate of the rear frame.

[0016] The working principle and advantages of the utility model are:

[0017] First, the structural integration of this solution is high. By improving the structure of the front blocking plate - integrating multiple parts on the front blocking plate (including the front crossbeam, accessory mounting block and water inlet and outlet nozzles formed by die-casting), the number of parts and the amount of assembly in the box assembly process can be effectively reduced. In addition, through die-casting integration, the number of welds between parts can be fundamentally reduced, and the structural stability is better.

[0018] Second, this solution also specially adds a load-bearing boss on the front sealing plate, which can be overlapped on the liquid cooling plate to disperse the load, thereby alleviating the load at the weld (such as the weld between the front sealing plate and the liquid cooling plate) and reducing the risk of weld damage.

[0019] Third, this solution uses brazing to seal the four corners of the liquid cooling channel, and the connections between the remaining parts are all made by friction welding. Compared with the conventional arc welding connection, this solution can reduce welding pores from the root by optimizing the welding form, making the welding more stable and having sufficient overall rigidity. In addition, under the structural setting of this solution, there are no arc welding joints at the upper and lower thin walls of the liquid cooling channel in the liquid cooling plate, which can eliminate the risk of welding penetration and leakage, and the structural setting is reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a first schematic diagram of the overall box structure of an embodiment of a high-strength liquid-cooled battery box of the utility model;

[0021] Figure 2 This is a second schematic diagram of the overall box structure of an embodiment of a high-strength liquid-cooled battery box of the utility model;

[0022] Figure 3 This is a first structural schematic diagram of a front blocking plate of an embodiment of a high-strength liquid-cooled battery box of the utility model;

[0023] Figure 4 This is a second structural schematic diagram of a front blocking plate of an embodiment of a high-strength liquid-cooled battery box of the utility model;

[0024] Figure 5 This is a schematic diagram of the front side beam structure of an embodiment of a high-strength liquid-cooled battery box of the utility model;

[0025] Figure 6 This is a first structural schematic diagram of a rear cross beam of an embodiment of a high-strength liquid-cooled battery box of the utility model;

[0026] Figure 7 This is a second structural schematic diagram of a rear cross beam of an embodiment of a high-strength liquid-cooled battery box of the utility model;

[0027] Figure 8 This is a first structural schematic diagram of a rear frame of an embodiment of a high-strength liquid-cooled battery box of the utility model;

[0028] Fig. 9 This is a second structural schematic diagram of the rear frame of a high-strength liquid-cooled battery box embodiment of the utility model. DETAILED DESCRIPTION

[0029] The following is a further detailed description through specific implementation methods:

[0030] The marks in the drawings of the specification include: left liquid cooling plate 1, right liquid cooling plate 2, left frame 3, right frame 4, front side beam 5, limiting slot 501, front blocking plate 6, load-bearing boss 601, front cross beam 602, accessory mounting block 603, positioning and limiting structure 604, inlet and outlet water nozzle 605, weight reduction groove 606, inlet and outlet flow channel groove 607, flow channel blocking plate 608, module positioning and limiting hole 609, rear frame 7, side plate 701, bottom plate 702, first limiting protrusion 703, second limiting protrusion 704, rear blocking block 705, rear cross beam 8, first chamfer 801, second chamfer 802, module positioning and limiting slot 803.

[0031] The embodiment is basically as shown in the attached Figure 1 , Figure 2 As shown: A high-strength liquid-cooled battery box, including a liquid cooling plate and a left frame 3, a right frame 4, a front side beam 5 and a rear frame 7 arranged around the liquid cooling plate. Specifically, the left frame 3, the right frame 4 and the rear frame 7 are fixedly connected to the liquid cooling plate by positive and negative friction welding. In this embodiment, the liquid cooling plate includes a left liquid cooling plate 1 and a right liquid cooling plate 2, and the two liquid cooling plates are fixedly connected by friction welding; the left liquid cooling plate 1 and the left frame 3, the right liquid cooling plate 2 and the right frame 4 are all welded together.

[0032] The front and rear sides of the liquid cooling plate are respectively fixed with a front blocking plate 6 and a rear cross beam 8 by friction welding. The liquid cooling plate is provided with a liquid cooling channel for the circulation of the cooling liquid. Figure 3 and Figure 4 As shown, load-bearing bosses 601 are provided at both ends of the front sealing plate 6; specifically, the load-bearing bosses 601 are rectangular convex strips, and overlapping grooves are provided on the lower surfaces of the left liquid cooling plate 1 and the right liquid cooling plate 2 to cooperate with the load-bearing bosses 601 to share the pressure of the front sealing plate 6.

[0033] The upper surface of the front blocking plate 6 is also provided with a front cross beam 602, an accessory mounting block 603 and an inlet and outlet water nozzle 605 through integrated die-casting; the lower surface of the front blocking plate 6 is provided with several weight-reducing grooves 606. In this embodiment, the accessory mounting block 603 is fixedly arranged on one side of the front cross beam 602 and is integrally connected to the front cross beam 602. There are two inlet and outlet water nozzles 605, and they are symmetrically arranged along the center line of the upper surface of the front blocking plate 6. There are 10 weight-reducing grooves 606 in total, and they are symmetrically arranged along the center line of the lower surface of the front blocking plate 6. With this structure, the overall weight of the front blocking plate 6 can be effectively reduced, the load-bearing capacity of the weld can be reduced, and the structure is more stable.

[0034] In addition, a plurality of module positioning and limiting holes 609 are provided on the front crossbeam 602, and a plurality of module positioning and limiting grooves 803 are provided on the rear crossbeam 8. In this embodiment, the module positioning and limiting holes 609 correspond to the module positioning and limiting grooves 803. The module positioning and limiting holes 609 and the module positioning and limiting grooves 803 are used to easily limit the position of the battery module, and the module assembly is more convenient and reliable.

[0035] The lower surface of the front blocking plate 6 is also provided with an inlet and outlet channel groove 607. In addition, a channel blocking plate 608 is provided at the inlet and outlet channel groove 607. Specifically, two inlet and outlet channel grooves 607 and two channel blocking plates 608 are provided, and they are symmetrically arranged along the midline of the lower surface of the front blocking plate 6. With this arrangement, the structure is evenly arranged and has good structural stability. The four corners of the liquid cooling channel are blocked by brazing, which can effectively seal the four corners of the liquid cooling channel to prevent leakage of coolant.

[0036] The front side of the accessory mounting block 603 is provided with a positioning and limiting structure 604 for positioning the front side beam 5. The positioning and limiting structure 604 is a rectangular protrusion; Figure 5 As shown, the front side beam 5 is provided with a limit slot 501 matching the rectangular protrusion. Figure 6 and Figure 7 As shown, a first chamfer 801 is provided at the junction of the upper surface and the left side of the rear cross beam 8; a second chamfer 802 is provided at the junction of the lower surface and the right side of the rear cross beam 8. Figure 8 and Fig. 9 As shown, the rear frame 7 includes a side plate 701 and a bottom plate 702 connected in one piece; a rear blocking block 705 is integrally provided on the bottom plate 702. A first limiting protrusion 703 matching the first chamfer 801 of the rear cross beam 8 is provided at the lower part of the side plate 701 of the rear frame 7; a second limiting protrusion 704 matching the second chamfer 802 of the rear cross beam 8 is provided on the upper surface of the bottom plate 702 of the rear frame 7. Through the above structure, the front side beam 5 and the accessory mounting block 603, the rear cross beam 8 and the rear frame 7 can all be quickly positioned, limited and assembled, and each structure is easy to assemble, which helps to improve the box assembly efficiency and ensure the assembly quality.

[0037] A high-strength liquid-cooled battery box provided in this embodiment has a high degree of structural integration. By improving the structure of the front sealing plate 6, the number of combinations and the amount of assembly of parts in the box assembly process can be effectively reduced; and associated positioning and limiting structures are provided between the structures, so that the assembly is convenient and reliable; a load-bearing boss 601 for dispersing the load is specially provided on the front sealing plate 6, and the welding form between the structures is optimized, which can ensure that the welding is stable and the structural setting is reliable.

[0038] The above is only an embodiment of the utility model. The common sense such as the known specific structure and characteristics in the scheme is not described in detail here. The ordinary technicians in the relevant field are aware of all the common technical knowledge in the technical field of the utility model before the application date or priority date, can obtain all the existing technologies in the field, and have the ability to apply the conventional experimental means before that date. The ordinary technicians in the relevant field can improve and implement the scheme in combination with their own abilities under the enlightenment given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for the technicians in this field, without departing from the structure of the utility model, several deformations and improvements can be made, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent.

Claims

1. A high-strength liquid-cooled battery box, comprising a liquid cooling plate and a left frame, a right frame, a front side beam and a rear frame arranged around the liquid cooling plate; characterized in that: The front and rear sides of the liquid cooling plate are respectively fixed with a front blocking plate and a rear cross beam by friction welding; a liquid cooling channel for the circulation of coolant is provided in the liquid cooling plate; load-bearing bosses are provided at both ends of the front blocking plate; the upper surface of the front blocking plate is also integrated with a front cross beam, an accessory mounting block and an inlet and outlet water nozzle by die-casting; the four corners of the liquid cooling channel are blocked by brazing.

2. A high-strength liquid-cooled battery box according to claim 1, characterized in that: A positioning and limiting structure for positioning the front side beam is provided on the front side surface of the accessory mounting block.

3. A high-strength liquid-cooled battery box according to claim 2, characterized in that: The positioning and limiting structure is a rectangular protrusion; the front side beam is provided with a limiting slot matching the rectangular protrusion.

4. A high-strength liquid-cooled battery box according to claim 1, characterized in that: The left frame and the right frame are fixedly connected to the liquid cooling plate by positive and negative friction welding.

5. A high-strength liquid-cooled battery box according to claim 1, characterized in that: The lower surface of the front blocking plate is provided with a plurality of weight-reducing grooves.

6. A high-strength liquid-cooled battery box according to claim 1, characterized in that: The lower surface of the front blocking plate is also provided with an inlet and outlet flow channel groove.

7. A high-strength liquid-cooled battery box according to claim 6, characterized in that: It also includes a flow channel blocking plate; the flow channel blocking plate is arranged at the inlet and outlet flow channel grooves.

8. A high-strength liquid-cooled battery box according to claim 1, characterized in that: A first chamfer is provided at the junction of the upper surface and the left side of the rear cross beam; a second chamfer is provided at the junction of the lower surface and the right side of the rear cross beam.

9. A high-strength liquid-cooled battery box according to claim 8, characterized in that: The rear frame comprises a side plate and a bottom plate which are integrally connected; and a rear blocking block is integrally arranged on the bottom plate.

10. A high-strength liquid-cooled battery box according to claim 9, characterized in that: A first limiting protrusion matching the first chamfer of the rear cross beam is disposed on the lower portion of the side plate of the rear frame; a second limiting protrusion matching the second chamfer of the rear cross beam is disposed on the upper surface of the bottom plate of the rear frame.

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