Novel battery water cooling plate

Abstract

The utility model relates to the technical field of heat dissipation of electronic equipment, in particular to a novel battery water cooling plate which comprises a shell and a fractal flow channel, the shell is made of aluminum, heat-conducting glue is arranged on the surface of the shell, and a fractal flow channel is formed in the shell; the fractal flow channel is divided into a liquid inlet, a liquid outlet and a three-stage flow channel network, and the liquid inlet is communicated with the liquid outlet through the three-stage flow channel network, so that the water-cooling plate realizes the uniformity of pressure distribution of the flow channels in the water-cooling plate through the design of the fractal flow channel, and further ensures the uniformity of flowing of cooling liquid; meanwhile, the heat dissipation effect of the water cooling plate is improved through the fractal flow channels, and the temperature difference between the inside and the outside of the battery pack is reduced.

Description

Technical Field

[0001] This utility model relates to the field of heat dissipation technology for electronic devices, specifically a novel battery water-cooling plate. Background Technology

[0002] Water-cooled plates, also known as liquid-cooled plates, are a type of high-efficiency heat dissipation equipment. They are mainly used to reduce the temperature of equipment and ensure its stable operation. Their working principle is to cool electronic components through flowing liquid, and they have the advantages of high heat dissipation efficiency, low noise, and good stability.

[0003] In use, the water-cooled plate for cooling the battery pack connects the battery pack to the water-cooled plate using thermally conductive adhesive. When the battery pack generates heat, it transfers its own heat to the water-cooled plate through the thermally conductive adhesive. The water-cooled plate then exchanges heat with the rapidly flowing coolant in its internal channels, thereby transferring the temperature to the coolant and reducing the temperature. This ensures the stability of the battery pack temperature and prevents the battery pack from overheating and affecting its stable operation.

[0004] In the process of using water-cooled plates, existing technologies mostly use traditional straight groove or serpentine flow channels to transport coolant. However, in the process of transporting coolant using traditional straight groove and serpentine flow channels, pressure differences are easily generated, which leads to uneven distribution of coolant in the flow channel. This results in uneven heat dissipation of the battery pack, causing local overheating and affecting the overall performance of the battery pack.

[0005] In view of this, we propose a novel battery water-cooling plate. Utility Model Content

[0006] The purpose of this invention is to provide a novel battery water-cooled plate to solve the problem of poor heat dissipation caused by uneven distribution of coolant within the water-cooled plate, as mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A novel battery water-cooling plate includes a housing and a graded flow channel. The housing is made of aluminum, which provides excellent thermal conductivity, facilitating the transfer of heat from the battery pack to the plate itself, and then from the plate itself to the coolant for efficient cooling of the battery pack. Simultaneously, aluminum has a low density, resulting in a lightweight water-cooling plate suitable for aerospace and automotive applications. The housing surface is coated with thermally conductive adhesive, which securely connects the housing to the battery pack. This adhesive also provides excellent thermal conductivity, enabling the transfer of heat from the battery pack and facilitating heat dissipation from the water-cooling plate. The housing contains fractal flow channels designed and manufactured using fractal algorithms. These channels achieve a gradient distribution of flow channel density, ensuring uniform coolant distribution and preventing localized overheating. The fractal flow channels consist of an inlet, an outlet, and a three-level flow channel network. The inlet and outlet are connected by the three-level flow channel network. Coolant enters through the inlet, passes through the three-level flow channel network, and exits through the outlet, thus dissipating heat from the battery pack. The three-level flow channel network achieves a gradient distribution of flow channel density through diversion and convergence, ensuring uniform coolant distribution.

[0009] Preferably, the thickness of the thermally conductive adhesive on the surface of the housing is 0.5mm-1mm; a thickness of 0.5mm avoids unstable connection and poor contact caused by excessively thin thermally conductive adhesive, while having low thermal resistance and ensuring thermal conductivity; a thickness of 1mm ensures the strength of the fixed connection between the water-cooling plate and the battery pack while ensuring thermal conductivity, preventing the battery pack from detaching from the water-cooling plate and reducing the heat dissipation effect.

[0010] Preferably, the fractal flow channel is filled with 50% water-ethylene glycol. 50% water-ethylene glycol as a coolant has the advantages of antifreeze, anti-boiling, anti-corrosion, good stability, good thermal conductivity, low cost and environmental protection. The antifreeze and anti-boiling effects enable the water-cooled plate to adapt to cold and high temperature environments, expanding the application scope of the water-cooled plate. The anti-corrosion effect protects the cold plate and improves the service life of the water-cooled plate.

[0011] Preferably, the fractal flow channel is laid out based on a heat source distribution mapping algorithm. This algorithm is widely used to analyze and visualize the distribution of heat sources in a system, helping to optimize heat dissipation design. The water-cooled plate uses the heat source distribution mapping algorithm to design an asymmetric arrangement of the flow channels based on the heat source distribution of the battery pack, increasing the flow channel density in the high-temperature region, thereby increasing the coolant content in the high-temperature region, thus improving heat dissipation in the high-temperature region and ensuring the uniformity of heat dissipation.

[0012] Preferably, the three-stage flow channel network is divided into a main channel, a secondary channel, and an end microchannel. The three-stage flow channel network adopts a flow channel structure layout of main channel – secondary channel – end microchannel – secondary flow channel – main channel. The two main channels are respectively connected to the inlet and the outlet. Multiple branch channels are opened in the secondary channels, and branch channels corresponding to the secondary channels are opened in the end microchannels. The coolant enters the main channel from the inlet, enters the secondary channel along the main channel, is branched through the branch channels, then passes through the end microchannel into another section of the secondary channel, and then enters the main channel connected to the outlet from the secondary channel for convergence, and flows out from the outlet.

[0013] Preferably, the main channel at the liquid inlet has a 90° bend, and both the main channel and the secondary flow channel at the liquid outlet have 120° bends. The 90° bend in the main channel at the liquid inlet is used to balance the pressure at the liquid inlet, and the 120° bends in the main channel and the secondary flow channel at the liquid outlet are used to balance the pressure at the liquid outlet, thereby ensuring the pressure balance inside the staged flow channels, thus ensuring the uniform flow rate of the coolant and the uniformity of heat dissipation.

[0014] Preferably, the bends in the three-stage flow channel network are provided with guide protrusions, and the bends are thickened. The guide protrusions are used to suppress the generation of eddies, achieve local pressure reduction, and avoid excessive pressure leading to insufficient coolant content, which in turn reduces the heat dissipation effect and causes uneven heat dissipation. The thickening treatment at the bends balances the internal pressure and flow velocity of the flow channel, ensuring the uniformity of coolant flow velocity, and thus ensuring the uniformity of heat dissipation.

[0015] Compared with the prior art, the beneficial effects of this utility model are: the water-cooled plate of this utility model achieves uniform pressure distribution in the internal flow channel through the design of the fractal flow channel, thereby ensuring uniform flow of coolant and thus ensuring uniform heat dissipation of the water-cooled plate. At the same time, the fractal flow channel improves the heat dissipation effect of the water-cooled plate and reduces the temperature difference between the inside and outside of the battery pack. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This utility model Figure 1 A magnified view of a portion of the liquid inlet;

[0018] Figure 3 This is a simulation diagram of the fractal flow channel of this utility model;

[0019] Figure 4 This is a temperature simulation diagram of the present invention.

[0020] In the picture:

[0021] 1. Shell;

[0022] 2. Fractal flow channel; 21. Inlet; 22. Outlet; 23. Three-stage flow channel network; 231. Main channel; 232. Secondary channel; 233. Terminal microchannel. Detailed Implementation

[0023] 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.

[0024] A battery pack consists of multiple batteries arranged in sequence. Inside each battery is a cell, which is the core component of the battery and is responsible for storing and releasing energy. During the storage and release of energy, the cell generates a large amount of heat, which in turn raises the battery temperature and consequently the temperature of the battery pack.

[0025] In use, the water-cooled plate for cooling the battery pack connects the battery pack to the water-cooled plate using thermally conductive adhesive. When the battery pack generates heat, it transfers its own heat to the water-cooled plate through the thermally conductive adhesive. The water-cooled plate then exchanges heat with the rapidly flowing coolant in its internal channels, thereby transferring the temperature to the coolant and reducing the temperature. This ensures the stability of the battery pack temperature and prevents the battery pack from overheating and affecting its stable operation.

[0026] In the use of water-cooled plates, existing technologies mostly employ traditional straight-groove or serpentine flow channels for coolant delivery. However, traditional straight-groove flow channels have short and direct paths, resulting in a small pressure difference between the inlet and outlet and a higher pressure in the middle. This causes the coolant to tend to concentrate at the inlet and outlet, leading to uneven coolant distribution. Serpentine flow channels have many bends, where higher pressure occurs, resulting in less coolant at the bends and uneven coolant distribution. The uneven coolant distribution in traditional straight-groove and serpentine flow channels leads to uneven heat dissipation in the battery pack, causing localized overheating and affecting the overall performance of the battery pack.

[0027] like Figures 1 to 4As shown, a novel battery water-cooling plate includes a housing 1 and a graded flow channel. The housing 1 is made of aluminum, which gives the water-cooling plate excellent thermal conductivity, facilitating the transfer of heat from the battery pack to itself, and then from itself to the coolant, achieving efficient cooling of the battery pack. Simultaneously, aluminum has a low density, making the resulting water-cooling plate lightweight, suitable for use in aerospace and automotive fields. The surface of the housing 1 is covered with thermally conductive adhesive, which securely connects the housing 1 to the battery pack. The thermally conductive adhesive has good thermal conductivity, enabling the transfer of heat from the battery pack, thus facilitating heat dissipation from the battery pack by the water-cooling plate. The housing 1 contains… A fractal flow channel 2 is provided. The fractal flow channel 2 is designed and manufactured using fractal algorithms. The fractal flow channel 2 achieves a gradient distribution of flow channel density through fractal algorithms, ensuring uniform distribution of coolant and avoiding excessive local temperature. The fractal flow channel 2 is divided into an inlet 21, an outlet 22, and a three-level flow channel network 23. The inlet 21 and the outlet 22 are connected by the three-level flow channel network 23. Coolant enters from the inlet 21, passes through the three-level flow channel network 23, and flows out from the outlet 22, thereby dissipating heat from the battery pack. The three-level flow channel network 23 achieves a gradient distribution of flow channel density through diversion and convergence, ensuring uniform distribution of coolant.

[0028] Preferably, the housing 1 has mounting holes for connecting to a bracket, such as a car bracket, by means of screws; therefore, when designing the fractal flow channel 2, the gap of the fractal flow channel 2 is adjusted to ensure the balance of the internal pressure of the fractal flow channel 2.

[0029] In this embodiment, the thickness of the thermally conductive adhesive on the surface of the housing 1 is 0.5mm-1mm;

[0030] Specifically, a 0.5mm thickness of thermally conductive adhesive avoids unstable connections and poor contact caused by excessively thin adhesive, while also having low thermal resistance to ensure thermal conductivity. A 1mm thickness of thermally conductive adhesive ensures both thermal conductivity and the strength of the fixed connection between the water-cooling plate and the battery pack, preventing the battery pack from detaching from the water-cooling plate and reducing heat dissipation.

[0031] Preferably, the thermally conductive adhesive is used to transfer the temperature of the battery pack, so that the temperature on the battery pack can be quickly transferred to the water cooling plate for rapid heat dissipation through the coolant. At the same time, the thermally conductive adhesive also has the function of filling the flatness of the contact surface.

[0032] In this embodiment, the fractal channel 2 is filled with 50% water-glycol;

[0033] Specifically, using 50% water-glycol as a coolant has the advantages of antifreeze, antiboiling, anticorrosion, good stability, good thermal conductivity, low cost and environmental protection. The antifreeze and antiboiling effects enable the water-cooled plate to adapt to cold and high temperature environments, expanding the application scope of the water-cooled plate. The anticorrosion effect protects the cold plate and improves its service life.

[0034] Preferably, methanol can be added to 50% water-ethylene glycol to improve antifreeze properties and further adapt to low-temperature environments; silicates can be added to 50% water-ethylene glycol to improve corrosion resistance, reduce corrosion of the casing 1, and increase the service life of the cooling plate.

[0035] In this embodiment, the fractal flow channel 2 is laid out based on a heat source distribution mapping algorithm;

[0036] Specifically, the heat source distribution mapping algorithm layout is widely used to analyze and visualize the distribution of heat sources in the system, helping to optimize heat dissipation design. The water-cooled plate uses the heat source distribution mapping algorithm to design the asymmetric arrangement of the flow channels based on the heat source distribution of the battery pack, which increases the flow channel density in the high-temperature area, thereby increasing the coolant content in the high-temperature area, thus improving the heat dissipation of the high-temperature area and ensuring the uniformity of heat dissipation.

[0037] Preferably, the heat source distribution algorithm includes finite element analysis, priority difference analysis, and computational fluid dynamics;

[0038] Finite element analysis divides the system into finite elements and obtains the temperature distribution by solving the heat conduction equation. It is suitable for complex geometries and boundary conditions and has the advantage of high accuracy.

[0039] The finite difference method discretizes the heat conduction equation and solves it through finite difference approximation, which has the advantages of simple implementation and fast computation.

[0040] Computational fluid dynamics combines fluid flow and heat conduction equations to simulate the heat distribution in a fluid, enabling simultaneous analysis of fluid flow and heat conduction, making it suitable for complex systems.

[0041] In this embodiment, the three-level flow channel network 23 is divided into a main channel 231, a secondary channel 232, and an end microchannel 233. The three-level flow channel network 23 adopts a flow channel structure layout of main channel 231 - secondary channel 232 - end microchannel 233 - secondary flow channel - main channel 231. The two main channels 231 are respectively connected to the inlet 21 and the outlet 22. Multiple diversion channels are opened in the secondary channel 232, and diversion channels corresponding to the secondary channel 232 are opened in the end microchannel 233.

[0042] Specifically, the fractal flow channel 2 consists of two main channels 231, two secondary channels 232, and a terminal microchannel 233. The coolant enters through the inlet 21 and flows into the main channel 231 connected to the inlet 21. After entering the secondary channel 232 along the main channel 231, it is split and then passes through the terminal microchannel 233 into another secondary channel 232. It then enters the main channel 231 connected to the outlet 22 from the other end of the secondary channel 232 for convergence, and then flows out from the outlet 22.

[0043] In this embodiment, the main channel 231 at the liquid inlet 21 has a 90° bend, the main channel 231 and the secondary channel 232 at the liquid outlet 22 have 120° bends, and the three-stage flow channel network 23 has bends.

[0044] Specifically, the 90° bend in the main channel 231 at the inlet 21 is used to balance the pressure at the inlet 21, and the 120° bend in the main channel 231 and the secondary flow channel at the outlet 22 is used to balance the pressure at the outlet 22, thereby ensuring the pressure balance inside the parted flow channel 2, thus ensuring the uniform flow rate of the coolant and the uniformity of heat dissipation.

[0045] In this embodiment, the bends of the three-level flow channel network 23 are provided with flow guiding protrusions, and the bends are thickened.

[0046] Specifically, the guide protrusions are used to suppress the generation of eddies, achieve local pressure reduction, and avoid excessive pressure leading to insufficient coolant content, which in turn reduces the heat dissipation effect and causes uneven heat dissipation. The thickening treatment at the bends balances the internal pressure and flow velocity of the flow channel, ensuring the uniformity of coolant flow velocity, and thus ensuring the uniformity of heat dissipation.

[0047] Figure 3 This is a simulation diagram of the fractal channel of this utility model. The diagram shows the finite element simulation of the internal pressure, temperature, and velocity of the channel. The diagram clearly shows the uniform distribution of pressure, temperature, and velocity inside the channel. This diagram is a simulation of the operation when 20°C coolant is injected into the water-cooled plate at a flow rate of 10L / min under an ambient temperature of 30°C. Under these conditions, the internal pressure of the channel is 9Kpa, the temperature of the connection surface between the liquid-cooled plate and the battery pack is 2.7°C, and the coolant flow rate is maintained at a stable flow rate of 10L / min. Compared with traditional straight groove and serpentine channels, this significantly reduces the internal pressure of the channel while ensuring a uniform pressure distribution. This, in turn, ensures the stable flow of coolant in all areas inside the water-cooled plate, thereby ensuring uniform heat dissipation of the water-cooled plate.

[0048] Figure 4 This is a temperature simulation diagram of the present invention. Figure 4The figures sequentially display the surface temperature of the battery cell, the surface temperature of the water-cooled plate, and the cross-sectional temperature of the bottom surface of the battery cell under the design of this utility model. As can be seen from the figures, the surface temperature of the water-cooled plate is uniform and the surface and internal temperatures of each battery cell are consistent, thus ensuring the uniformity of the overall temperature of the battery pack. At the same time, the surface temperature of the battery cell is 25.3°C, the internal temperature of the battery cell is 28.6°C, and the temperature difference between the inside and outside of the battery cell is reduced to 3.2°C. Compared with the temperature difference between the inside and outside of the battery cells of traditional straight groove and serpentine flow channels, this is a significant reduction, which proves the improved heat dissipation effect of the water-cooled plate of this utility model and reduces the overall temperature of the battery pack.

[0049] This utility model discloses a novel battery water-cooling plate. In use, the housing 1 is fixedly connected to the battery pack by thermally conductive adhesive, and then the housing 1 is fixedly installed on the bracket. When the battery pack is working, the coolant flows into the main channel 231 from the inlet 21, and then enters the secondary channel 232 from the main channel 231. The coolant flows out from the secondary channel 232, passes through the end microchannel 233, enters another section of the secondary channel 232, and then flows into the main channel 231 from the secondary channel 232, and flows out from the outlet 22, thereby achieving heat dissipation for the battery pack.

[0050] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. 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 preferred examples and are not intended to limit the 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 the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A novel battery water-cooled plate, characterized in that: It includes a shell (1) and a fractal flow channel (2); The housing (1) is made of aluminum, and the surface of the housing (1) is covered with thermally conductive adhesive. A fractal flow channel (2) is provided inside the housing (1). The fractal flow channel (2) is divided into an inlet (21), an outlet (22) and a three-stage flow channel network (23), and the inlet (21) and outlet (22) are connected by the three-stage flow channel network (23); The three-level flow channel network (23) is divided into a main channel (231), a secondary channel (232) and an end micro channel (233). The three-level flow channel network (23) adopts a flow channel structure layout of main channel (231) - secondary channel (232) - end micro channel (233) - secondary flow channel - main channel (231). The two main channels (231) are connected to the inlet (21) and the outlet (22) respectively. The secondary channel (232) has multiple diversion channels, and the terminal microchannel (233) has a diversion channel corresponding to the secondary channel (232).

2. The battery water-cooling plate according to claim 1, characterized in that: The thickness of the thermally conductive adhesive on the surface of the housing (1) is 0.5mm-1mm.

3. The battery water-cooling plate according to claim 1, characterized in that: The main channel (231) at the liquid inlet (21) has a 90° bend, and the main channel (231) and the secondary channel (232) at the liquid outlet (22) both have a 120° bend.

4. The battery water-cooling plate according to claim 1, characterized in that: The bends of the three-level flow channel network (23) are provided with flow guiding protrusions and the bends are thickened.

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