Battery pack liquid cooling plate of electric automobile

Abstract

A battery pack liquid cooling plate of an electric automobile comprises a liquid cooling plate upper plate and a liquid cooling plate lower plate, and the liquid cooling plate upper plate and the liquid cooling plate lower plate are connected into a whole through a laser welding technology. The liquid cooling plate upper plate is of a bilateral symmetry structure, an upward convex groove is formed in the liquid cooling plate upper plate in the longitudinal direction, and a liquid inlet and a liquid outlet which are communicated with a battery pack cooling liquid pipeline are formed in the left side and the right side of the liquid cooling plate upper plate respectively; the liquid cooling plate lower plate is of a bilateral symmetry structure, downward grooves are formed in the liquid cooling plate lower plate in the longitudinal direction, the grooves correspond to the convex grooves of the liquid cooling plate upper plate in position, and the number of the grooves is at least two times that of the convex grooves. And a plurality of groups of longitudinal long straight flow channels which are respectively communicated with the liquid inlet and the liquid outlet are formed between the liquid cooling plate upper plate and the liquid cooling plate lower plate. The liquid cooling plate not only can improve the heat exchange effect of the liquid cooling plate, but also can adapt to the characteristics of a laser welding process, and achieves the purposes of improving the product quality of the liquid cooling plate and ensuring the safety and the power performance of a vehicle.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy electric vehicles, and specifically to a laser-welded liquid cooling plate for an electric vehicle battery pack, which is beneficial to improving thermal management effects. Background Art

[0002] As environmental pollution and energy issues become increasingly prominent, developing pure electric vehicles is an effective way to address these issues. Battery packs, the power source of new energy vehicles, generate significant heat during charging and discharging, raising the battery temperature. Batteries must maintain a certain temperature range during operation, so thermal management is a key parameter in measuring battery pack performance.

[0003] The function of an electric vehicle battery pack liquid cooling plate is to cool the battery pack by absorbing and removing heat generated by the battery cells through a fluid medium. To minimize vehicle weight, most liquid cooling plates are made of aluminum alloy. The principle is to machine fluid channels into an aluminum alloy plate. The battery module is mounted on the liquid cooling plate, and the cooling medium flows in through the inlet and out through the outlet. To ensure the safety and power performance of the entire electric vehicle, the liquid cooling plate product design must not only ensure effective battery pack thermal management but also strictly control its airtightness. Existing liquid cooling plates utilize a welded upper and lower plate structure. Typically, the upper plate is flat, while the lower plate is equipped with a winding flow channel. The upper and lower plates are connected by brazing. The complex structure of the lower plate and the winding flow of the cooling medium increase molding and processing costs, increase the resistance to liquid circulation, and negatively impact the heat exchange efficiency of the liquid cooling plate. Furthermore, the brazing process has poor heat resistance, resulting in low joint strength, and the lap weld joint increases the parent material consumption and overall weight. Utility Model Content

[0004] The utility model provides a liquid cooling plate for the battery pack of an electric vehicle. By optimizing the flow channel structure and increasing the flow channel cross-sectional area, the heat exchange effect of the liquid cooling plate can be improved, and the characteristics of the laser welding process can be adapted to achieve the purpose of improving the product quality of the liquid cooling plate and ensuring the safety and power performance of the vehicle.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A battery pack liquid cooling plate for an electric vehicle comprises an upper plate of a liquid cooling plate and a lower plate of the liquid cooling plate, which are connected as a whole by a laser welding process; the upper plate of the liquid cooling plate is formed by a stamping process and has a bilaterally symmetrical structure, the upper plate of the liquid cooling plate is provided with an upward convex groove in the longitudinal direction, and a liquid inlet and a liquid outlet connected to the battery pack coolant pipeline are respectively provided on the left and right sides of the upper plate of the liquid cooling plate; the lower plate of the liquid cooling plate is formed by a stamping process and has a bilaterally symmetrical structure, the lower plate of the liquid cooling plate is provided with a downward groove in the longitudinal direction, the groove corresponds to the position of the convex groove of the upper plate of the liquid cooling plate, and the number of grooves is at least twice the number of the convex grooves, and through the cooperation of the convex grooves and the grooves, a plurality of groups of longitudinal long straight flow channels respectively connected to the liquid inlet and the liquid outlet are formed between the upper plate of the liquid cooling plate and the lower plate of the liquid cooling plate.

[0007] The battery pack liquid cooling plate of the above-mentioned electric vehicle has weight-reducing holes on the upper plate and the lower plate of the liquid cooling plate at non-flow channel positions. The weight-reducing holes are longitudinal long holes parallel to the flow channel. The weight-reducing holes on the upper plate of the liquid cooling plate are opposite to the weight-reducing holes on the lower plate of the liquid cooling plate.

[0008] The battery pack liquid cooling plate of the electric vehicle is provided with connecting ribs on the weight-reducing holes of the lower plate of the liquid cooling plate. The connecting ribs are evenly arranged along the axis direction of the weight-reducing holes of the lower plate of the liquid cooling plate.

[0009] The battery pack liquid cooling plate of the electric vehicle is provided with exhaust holes on the lower plate of the liquid cooling plate, and the exhaust holes are arranged in the welding area between the lower plate of the liquid cooling plate and the upper plate of the liquid cooling plate.

[0010] The utility model provides a liquid cooling plate for a battery pack of an electric vehicle, which connects an upper plate and a lower plate of a liquid cooling plate formed by a stamping process through a laser welding process, so that the convex groove of the upper plate of the liquid cooling plate corresponds to the groove of the lower plate of the liquid cooling plate, forming a plurality of groups of longitudinal long straight flow channels respectively connected to the liquid inlet and the liquid outlet, thereby not only avoiding the problems of large resistance of the circuitous flow channel and high forming processing cost, but also increasing the cross-sectional area of ​​the flow channel, which is more conducive to improving the heat exchange effect between the cooling water and the battery pack, and is also conducive to the implementation of the laser welding process; the utility model provides weight reduction holes at non-flow channel positions of the upper plate and the lower plate of the liquid cooling plate, and provides connecting ribs on the weight reduction holes of the lower plate of the liquid cooling plate, which on the one hand reduces the weight of the liquid cooling plate, and on the other hand ensures the strength and rigidity of the liquid cooling plate product; the utility model also provides exhaust holes on the lower plate of the liquid cooling plate, so that during the welding process of the upper plate and the lower plate of the liquid cooling plate, the air between the two layers of plates can be effectively removed, further improving the laser welding quality, thereby improving the qualified rate of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the structure of the utility model;

[0012] Figure 2 yes Figure 1Attached view (rotated 180° clockwise);

[0013] Figure 3 yes Figure 2 Schematic diagram of the AA section structure;

[0014] Figure 4 yes Figure 3 A magnified view of the structure at position Ⅰ in the middle;

[0015] Figure 5 yes Figure 2 Schematic diagram of the structure of the middle ⅠB-B section;

[0016] Figure 6 yes Figure 5 A magnified view of the structure at center Ⅱ;

[0017] Figure 7 It is a schematic diagram of the upper and lower structures of the liquid cooling plate;

[0018] Figure 8 This is a schematic diagram of the lower plate structure of the liquid cooling plate.

[0019] Explanation of the numbers in the figure:

[0020] 1 is the upper plate of the liquid cooling plate, 1-1 is the convex groove; 2 is the lower plate of the liquid cooling plate, 2-1 is the groove; 3 is the liquid inlet; 4 is the liquid outlet; 5 is the weight reduction hole; 6 is the connecting rib; 7 is the exhaust hole; 8 is the long straight channel. DETAILED DESCRIPTION

[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0022] See Figure 1 、 Figure 2 、 Figure 3 、 Figure 5 、 Figure 7 、 Figure 8The utility model provides a liquid cooling plate for a battery pack of an electric vehicle, which comprises a liquid cooling plate upper plate 1 and a liquid cooling plate lower plate 2, which are connected as a whole by a laser welding process; the liquid cooling plate upper plate 1 is formed by a stamping process and has a bilaterally symmetrical structure, the liquid cooling plate upper plate 1 is provided with an upward convex groove 1-1 in the longitudinal direction, and a liquid inlet 3 and a liquid outlet 4 connected to the battery pack coolant pipeline are respectively provided on the left and right sides of the liquid cooling plate upper plate 1; the liquid cooling plate lower plate 2 is formed by a stamping process, It has a bilaterally symmetrical structure. The lower plate 2 of the liquid cooling plate is provided with a downward groove 2-1 in the longitudinal direction. The groove 2-1 corresponds to the position of the convex groove 1-1 on the upper plate 1 of the liquid cooling plate. The number of grooves 2-1 is at least twice the number of convex grooves 1-1. After the upper plate 1 and the lower plate 2 of the liquid cooling plate are welded, the convex groove 2-1 and the groove 2-2 are buckled together, forming several groups of longitudinal long direct current channels 8 between the upper plate 1 and the lower plate 2 of the liquid cooling plate. After the longitudinal long direct current channels 8 are merged, their two ends are respectively connected to the liquid inlet 3 and the liquid outlet 4.

[0023] See Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 The battery pack liquid cooling plate of the electric vehicle described in the present invention has weight-reducing holes 5 on the upper plate 1 and the lower plate 2 of the liquid cooling plate at non-flow channel positions. The weight-reducing holes 5 are longitudinal long holes parallel to the flow channel. The weight-reducing holes on the upper plate 1 of the liquid cooling plate are opposite to the weight-reducing holes on the lower plate 2 of the liquid cooling plate. Connecting ribs 6 are provided on the weight-reducing holes of the lower plate 2 of the liquid cooling plate, and the connecting ribs 6 are evenly arranged along the axis direction of the weight-reducing holes of the lower plate 2 of the liquid cooling plate.

[0024] See Figure 1 、 Figure 2 、 Figure 8 The battery pack liquid cooling plate of the electric vehicle described in the present invention has an exhaust hole 7 on its liquid cooling plate lower plate 2, and the exhaust hole 7 is arranged in the welding area between the liquid cooling plate lower plate 2 and the liquid cooling plate upper plate 1.

[0025] See Figures 1 to 8The present invention is a liquid cooling plate for an electric vehicle battery pack. It connects a stamped upper plate 1 and a lower plate 2 via laser welding. This process aligns the protruding groove 1-1 of the upper plate 1 with the groove 2-1 of the lower plate 2, forming several groups of longitudinal straight channels 8 that communicate with the liquid inlet 3 and the liquid outlet 4, respectively. The liquid inlet 3 of the present invention is connected to an external water nozzle, allowing coolant to flow into the liquid cooling plate. The coolant flows out of the liquid cooling plate through the liquid outlet 4, removing heat and thereby cooling the battery cells. The primary material of the liquid inlet 3 and outlet 4 is Al3003-H14 aluminum alloy. The liquid inlet 3 and outlet 4 are connected to the liquid cooling plate upper plate 1 via laser welding. The present invention provides weight-reducing holes 5 at non-flow channel positions on both the upper plate 1 and the lower plate 2 of the liquid cooling plate, and provides connecting ribs 6 on the weight-reducing holes of the lower plate 2 of the liquid cooling plate. This reduces the weight of the liquid cooling plate on the one hand, and ensures the strength and rigidity of the liquid cooling plate product on the other hand. The liquid flow channel of the present invention is a long straight flow channel 8, which is more conducive to the implementation of the laser welding process, can improve the efficiency of laser welding and reduce welding defects. The present invention is designed with an exhaust hole 7 with a diameter of 10 mm on the lower plate 2 of the liquid cooling plate, which can remove the air between the two layers of plates during the welding process of the upper plate 1 and the lower plate 2 of the liquid cooling plate, thereby further improving the quality of laser welding and improving the product qualification rate.

Claims

1. A liquid cooling plate for a battery pack of an electric vehicle, characterized by: The liquid cooling plate upper plate (1) and the liquid cooling plate lower plate (2) are connected as a whole by a laser welding process; the liquid cooling plate upper plate (1) is formed by a stamping process and has a bilaterally symmetrical structure; the liquid cooling plate upper plate (1) is provided with an upward convex groove (1-1) along the longitudinal direction, and a liquid inlet (3) and a liquid outlet (4) connected to the battery pack coolant pipeline are respectively provided on the left and right sides of the liquid cooling plate upper plate (1); the liquid cooling plate lower plate (2) is formed by a stamping process , presenting a bilaterally symmetrical structure, the lower plate (2) of the liquid cooling plate is provided with a downward groove (2-1) along the longitudinal direction, the groove (2-1) corresponds to the position of the convex groove (1-1) of the upper plate (1) of the liquid cooling plate, and the number of the grooves (2-1) is at least twice the number of the convex grooves (1-1), and through the cooperation of the convex groove (1-1) and the groove (2-1), a plurality of groups of longitudinal long straight flow channels (8) respectively connected to the liquid inlet (3) and the liquid outlet (4) are formed between the upper plate (1) of the liquid cooling plate and the lower plate (2).

2. The liquid cooling plate for the battery pack of an electric vehicle according to claim 1, characterized in that: The liquid cooling plate upper plate (1) and the liquid cooling plate lower plate (2) are both provided with weight-reducing holes (5) at non-flow channel positions. The weight-reducing holes (5) are longitudinally long holes parallel to the flow channel. The weight-reducing holes of the liquid cooling plate upper plate (1) and the weight-reducing holes of the liquid cooling plate lower plate (2) are positioned opposite to each other.

3. The liquid cooling plate for the battery pack of an electric vehicle according to claim 2, characterized in that: Connecting ribs (6) are provided on the weight-reducing holes of the lower plate (2) of the liquid cooling plate, and the connecting ribs (6) are evenly arranged along the axis direction of the weight-reducing holes of the lower plate (2) of the liquid cooling plate.

4. The battery pack liquid cooling plate for an electric vehicle according to any one of claims 1 to 3, characterized in that: An exhaust hole (7) is provided on the liquid cooling plate lower plate (2), and the exhaust hole (7) is arranged in a welding area between the liquid cooling plate lower plate (2) and the liquid cooling plate upper plate (1).

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