Aluminum-plastic liquid cooling plate for power battery

Abstract

The utility model relates to liquid cooling plate technical field especially relates to a power battery aluminum plastic liquid cooling plate, including liquid cooling plate body, liquid cooling plate body includes aluminum upper plate, is provided with the flow channel portion of protruding on aluminum upper plate, and the clearance of flow channel portion on aluminum upper plate is arrayed and is opened to have overflow groove, plastic flow channel board, plastic flow channel board injection moulding is in the bottom of aluminum upper plate, and it is wrapped in the flow channel portion outside on aluminum upper plate through overflow groove, and its inside is opened to have the flow channel groove corresponding with flow channel portion. The utility model discloses through placing aluminum upper plate and sand core in injection mold, then injection moulding integrally injection moulding of plastic melt liquid injection mould, in the plastic flow channel board forming process, melt liquid diffuses and wraps in the outside of aluminum upper plate through overflow groove on aluminum upper plate, makes aluminum upper plate and plastic flow channel board more closely firm combination, has kept the characteristics such as aluminum base material heat conductivity good and plastic light weight, and has improved the defect that the metal piece and nonmetal piece combination of existing composite liquid cooling plate easily produce interface delamination, bear small pressure.

Description

Technical Field

[0001] This utility model relates to the field of liquid cooling plate technology, and in particular to an aluminum-plastic liquid cooling plate for power batteries. Background Technology

[0002] As new energy vehicles develop towards longer range and faster charging power, the heat generated by power batteries has surged. When the fast charging power exceeds 300kW, the highest temperature of the battery cell exceeds 60℃, and a temperature difference of more than 8℃ in the battery pack will increase the difference in the aging rate of the battery cells by 30%. Therefore, efficient heat dissipation has become crucial, and liquid cooling plate technology is particularly essential. Current liquid cooling plates have significant shortcomings: traditional liquid cooling plates are mostly made of pure aluminum or aluminum alloy, which have problems such as heavy weight, high cost, and easy electrolytic corrosion (when in contact with the battery, the corrosion rate is 0.2mm / year after electrolyte leakage for half a year). In addition, the flow channel design has low flexibility and is difficult to adapt to non-uniform heat distribution. Although plastic liquid cooling plates are lightweight, they have poor thermal conductivity and insufficient impact resistance and temperature resistance, and cannot cope with the risks of battery vibration and high temperature.

[0003] While metal-plastic composite structures attempt to balance performance, they are prone to interfacial delamination. Due to the large difference in thermal expansion coefficients between aluminum and plastic, the delamination rate is high after long-term use and thermal cycling, which seriously affects sealing and durability. Furthermore, it is difficult to balance sealing and insulation; increasing the adhesive increases thermal resistance, while decreasing it leads to leakage. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides an aluminum-plastic liquid cooling plate for power batteries, which solves the technical problems of traditional aluminum alloy liquid cooling plates being heavy, expensive, prone to electrolytic corrosion, and having inflexible flow channels; plastic liquid cooling plates having poor thermal conductivity and insufficient impact resistance and temperature resistance; and metal-plastic composite plates being prone to delamination and difficult to balance sealing and insulation. It achieves the goal of balancing efficient heat dissipation, lightweight and low cost, and solves the problem of difficulty in balancing sealing and heat dissipation caused by interface delamination.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a power battery aluminum-plastic liquid cooling plate, including a liquid cooling plate body, the liquid cooling plate body including an aluminum upper plate, the aluminum upper plate being provided with a protruding flow channel portion, and overflow grooves for easy injection molding being arrayed at the gaps of the flow channel portion on the aluminum upper plate.

[0006] A plastic flow channel plate is injection molded on the bottom of an aluminum upper plate and wrapped around the outer side of the flow channel portion on the aluminum upper plate through an overflow groove. The flow channel plate has a flow channel groove inside that corresponds to the flow channel portion.

[0007] The flow channel on the aluminum upper plate and the flow channel groove opened in the plastic flow channel plate form a heat dissipation flow channel. The flow channel on the aluminum upper plate is symmetrically welded with inlet and outlet nozzles for the flow of coolant.

[0008] A further improvement lies in that the heat dissipation flow channel is two groups of a "日"-shaped structure with one side in through connection, and the cross section of the heat dissipation flow channel adopts a rectangular cross section with rounded corner design.

[0009] A further improvement lies in that the inner wall of the flow channel part is a corrugated inner wall, the corrugation height of which is 10%-20% of the height of the heat dissipation flow channel, and the wavelength is 1-2 times the width of the flow channel.

[0010] A further improvement lies in that multiple sets of micro heat-conducting fins for heat absorption and conduction are fixedly connected to the inner wall of the flow channel part, the micro heat-conducting fins are arranged transversely along the width direction of the heat dissipation flow channel, the height thereof is %-% of the height of the heat dissipation flow channel, and the micro heat-conducting fins in the same set are arranged in a staggered manner.

[0011] A further improvement lies in that turbulence columns are fixedly connected to the inner wall of the flow channel part in a staggered array, the height of the turbulence columns is 70%-80% of the height of the heat dissipation flow channel, and the interval between adjacent turbulence columns is 1.5-2 times the width of the heat dissipation flow channel.

[0012] A further improvement lies in that the turbulence column is of a rhombic structure, on which a tapered hole inclined towards the inner wall of the flow channel part is penetratingly opened, the wide aperture of the tapered hole faces the liquid inlet side, and the inclination angle thereof is 30°-45°.

[0013] With the above technical solutions, the present utility model provides an aluminum-plastic liquid cooling plate for power batteries, which at least has the following beneficial effects: 1. According to the present utility model, the aluminum upper plate and the sand core are placed in an injection mold, and then the plastic melt is injected into the mold for integral injection molding. During the molding process of the plastic flow channel plate, the plastic melt spreads and wraps the outer side of the aluminum upper plate through the overflow groove on the aluminum upper plate, so that the aluminum upper plate and the plastic flow channel plate are combined more closely and firmly. The present utility model retains the characteristics of good thermal conductivity of the aluminum-based material and light weight of plastic, and improves the defects that the metal part and the non-metal part of the existing composite liquid cooling plate are prone to interface delamination and can bear little pressure.

[0014] 2. According to the present utility model, the temperature of the local hot spot area of the battery is conducted through the micro heat-conducting fins. When the cooling liquid flows through the micro heat-conducting fins, it is intercepted by the transversely arranged micro heat-conducting fins, which forcibly changes the flow direction, thereby generating strong disturbance, effectively destroying the boundary layer, increasing the convective heat transfer coefficient, and further improving the heat dissipation efficiency.

[0015] 3. According to the present utility model, the staggered turbulence columns can forcibly change the flow direction of the cooling liquid to break the laminar boundary layer, and cooperate with the tapered holes obliquely arranged thereon to guide the cooling liquid to flow to the inner wall of the flow channel part, thereby strengthening turbulence, further destroying the boundary layer, and enhancing the convective heat transfer effect. Brief Description of the Drawings

[0016] The accompanying drawings, which are provided to further illustrate this application and form part of this application, illustrate exemplary embodiments of this application and are used to explain this application, but do not constitute an undue limitation of this application.

[0017] In the attached diagram: Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the disassembled structure of this utility model; Figure 3 This is a cross-sectional structural diagram of the present invention; Figure 4 This is a cross-sectional view of the disassembled structure of this utility model; Figure 5 This is an independent schematic diagram of the aluminum upper plate and its upper structure of this utility model; Figure 6 This utility model Figure 5 Enlarged structural diagram at point A in the middle; Figure 7 This is a schematic diagram of the independent cross-sectional structure of the turbulence column of this utility model.

[0018] In the diagram: 1. Liquid cooling plate body; 2. Aluminum top plate; 21. Flow channel section; 22. Overflow groove; 3. Plastic flow channel plate; 31. Flow channel groove; 4. Heat dissipation channel; 5. Inlet and outlet nozzles; 6. Miniature heat-conducting fins; 7. Baffle column; 8. Conical hole. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Example 1

[0021] Addressing the existing problems of traditional aluminum alloy liquid cooling plates (heavy, expensive, prone to electrolytic corrosion, and inflexible flow channels); plastic liquid cooling plates (poor thermal conductivity, insufficient impact and temperature resistance); and metal-plastic composite plates (prone to delamination, making it difficult to balance sealing and insulation), this embodiment provides an aluminum-plastic liquid cooling plate for power batteries. This plate achieves a balance between efficient heat dissipation, lightweight design, and low cost, and solves the problem of difficulty in achieving both sealing and heat dissipation due to interface delamination. Please refer to... Figures 1-7This aluminum-plastic liquid cooling plate for power batteries includes a liquid cooling plate body 1. The liquid cooling plate body 1 comprises an upper aluminum plate 2, on which protruding flow channel portions 21 are arranged, and overflow grooves 22 facilitating injection molding are opened in an array at the gaps of the flow channel portions 21 on the upper aluminum plate 2. A plastic flow channel plate 3 is injection-molded at the bottom of the upper aluminum plate 2, and wraps the outer side of the flow channel portions 21 on the upper aluminum plate 2 through the overflow grooves 22, with flow channel grooves 31 corresponding to the flow channel portions 21 formed inside. The flow channel portions 21 on the upper aluminum plate 2 and the flow channel grooves 31 formed in the plastic flow channel plate 3 constitute a heat dissipation flow channel 4, and water inlet and outlet nozzles 5 for circulating cooling liquid are symmetrically welded on the flow channel portions 21 of the upper aluminum plate 2. By placing the upper aluminum plate 2 and a sand core into an injection mold, then injecting molten plastic into the mold for integral injection molding, during the molding process of the plastic flow channel plate 3, the molten plastic diffuses and wraps the outer side of the upper aluminum plate 2 through the overflow grooves 22 on the upper aluminum plate 2, so that the upper aluminum plate 2 and the plastic flow channel plate 3 are combined more tightly and firmly. This retains the characteristics of good thermal conductivity of aluminum-based materials and light weight of plastics, and improves the defects of the existing composite liquid cooling plates that the combination of metal parts and non-metal parts is prone to interface delamination and has low pressure resistance. When cooling the battery, the cooling liquid is injected into the heat dissipation flow channel 4 through the water inlet and outlet nozzles for circulating flow to dissipate heat.

[0022] Specifically, the heat dissipation flow channel 4 is of a structure with two groups of "ri"-shaped (closed-square) structures connected through one side, and the cross section of the heat dissipation flow channel 4 adopts a rectangular cross section with rounded corners. The two side-connected "ri"-shaped flow channels cooperate with the two symmetrically arranged water inlet and outlet nozzles 5 to form a complete cooling liquid circulation. The heat dissipation flow channel 4 adopts a rectangular cross section to adapt to the injection bonding of the upper aluminum plate 2 and the plastic flow channel plate 3, so as to improve the sealing performance and avoid cooling liquid leakage. The rounded corner design reduces the fluid flow dead zone, lowers the flow resistance, and improves its heat dissipation performance.

[0023] Further, the inner wall of the flow channel portion 21 is a corrugated inner wall, with a corrugation height of 10%-20% of the height of the heat dissipation flow channel 4 and a wavelength of 1-2 times the width of the flow channel. The corrugated inner wall with such height and wavelength will force the fluid to generate turbulence, the turbulence intensity is increased by 35%-45%, and the heat exchange efficiency is increased by 30%-35%. The corrugated bottom wall adapts to the fluid distribution under the action of gravity and reduces the thickness of the bottom boundary layer.

[0024] To further improve the cooling effect on the local hot spot area of the battery, multiple sets of micro heat-conducting fins 6 for heat absorption and conduction are fixedly connected to the inner wall of the flow channel portion 21. The micro heat-conducting fins 6 are arranged transversely along the width direction of the heat dissipation flow channel 4, with a height of 60%-70% of the height of the heat dissipation flow channel 4, and the micro heat-conducting fins 6 in the same group are arranged in a staggered manner. The temperature of the local hot spot area of the battery is conducted through the micro heat-conducting fins 6. When the cooling liquid flows through the micro heat-conducting fins 6, it is intercepted by the transversely arranged micro heat-conducting fins 6, forcing the flow direction to change, thereby generating strong disturbance, effectively destroying the boundary layer, increasing the convective heat transfer coefficient, and further improving the heat dissipation efficiency.

[0025] Example 2

[0026] Because the coolant forms a laminar boundary layer when flowing within the heat dissipation channel 4, affecting heat dissipation efficiency, therefore, based on Example 1, as follows... Figures 1-7 As shown, the inner wall of the flow channel 21 is fixedly connected with turbulence columns 7 in an alternating array, and the height of the turbulence columns 7 is 70%-80% of the height of the heat dissipation flow channel 4. The interval between adjacent turbulence columns 7 is 1.5-2 times the width of the heat dissipation flow channel 4. The alternating turbulence columns 7 can forcibly change the flow direction of the coolant, break the laminar boundary layer, and allow the high-temperature coolant in the center of the heat dissipation flow channel 4 to fully mix with the low-temperature coolant on the wall, forming turbulence, improving heat exchange efficiency, and avoiding the accumulation of local hot spots.

[0027] Furthermore, the turbulence column 7 has a rhomboid structure with a conical hole 8 that is inclined towards the inner wall of the flow channel 21. The wide diameter of the conical hole 8 faces the liquid inlet side, and its inclination angle is 30°-45°. Furthermore, the flowing coolant is guided to the inner wall of the flow channel 21 through the inclined conical hole 8, thereby enhancing turbulence. The wide diameter of the conical hole 8 faces the liquid inlet side. When the coolant flowing through the conical hole 8 flows out from the narrow hole outlet, the relatively high-speed coolant will form a strong mixture and disturbance with the coolant in the heat dissipation channel 4, further destroying the boundary layer and enhancing the convective heat transfer effect.

[0028] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A power battery aluminum-plastic liquid cooling plate, comprising a liquid cooling plate body (1), characterized in that: The liquid cooling plate body (1) includes an aluminum upper plate (2), and the aluminum upper plate (2) is provided with a protruding flow channel (21). Overflow grooves (22) are arrayed at the gap of the flow channel (21) on the aluminum upper plate (2) to facilitate injection molding. Plastic flow channel plate (3) is injection molded on the bottom of aluminum upper plate (2) and wrapped around the outside of the flow channel part (21) on the aluminum upper plate (2) through overflow groove (22). The flow channel groove (31) corresponding to the flow channel part (21) is opened inside. The flow channel (21) on the aluminum upper plate (2) and the flow channel groove (31) opened in the plastic flow channel plate (3) form a heat dissipation flow channel (4). The flow channel (21) on the aluminum upper plate (2) is symmetrically welded with inlet and outlet water nozzles (5) for flowing coolant.

2. The aluminum-plastic liquid cooling plate for power batteries according to claim 1, characterized in that: The heat dissipation channel (4) is a s-shaped structure with two sets of channels connected on one side, and the heat dissipation channel (4) has a rectangular cross section and rounded corners.

3. The aluminum-plastic liquid cooling plate for power batteries according to claim 1, characterized in that: The inner wall of the flow channel (21) is a corrugated inner wall, the height of which is 10%-20% of the height of the heat dissipation flow channel (4), and the wavelength is 1-2 times the width of the flow channel.

4. The aluminum-plastic liquid cooling plate for power batteries according to claim 1, characterized in that: The inner wall of the flow channel (21) is fixed with multiple sets of heat-absorbing and conducting micro heat-conducting fins (6), and the micro heat-conducting fins (6) are arranged laterally along the width direction of the heat dissipation flow channel (4), and their height is 60%-70% of the height of the heat dissipation flow channel (4). The micro heat-conducting fins (6) in the same set are arranged alternately.

5. The aluminum-plastic liquid cooling plate for power batteries according to claim 1, characterized in that: The inner wall of the flow channel (21) is fixed with staggered array of turbulence columns (7), and the height of the turbulence columns (7) is 70%-80% of the height of the heat dissipation flow channel (4), and the interval between adjacent turbulence columns (7) is 1.5-2 times the width of the heat dissipation flow channel (4).

6. The aluminum-plastic liquid cooling plate for power batteries according to claim 5, characterized in that: The turbulence column (7) has a rhomboid structure and a conical hole (8) that is inclined toward the inner wall of the flow channel (21) is opened through it. The wide diameter of the conical hole (8) faces the liquid inlet side and its inclination angle is 30°-45°.

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