Battery liquid cooling plate based on topological structure

Abstract

The utility model is suitable for the technical field of battery thermal management, and provides a battery liquid cooling plate based on a topological structure, which adopts a total-branch-total flow channel structure and comprises a cooling liquid inlet, a liquid inlet flow channel, a cooling liquid outlet, a liquid outlet flow channel and at least three branch areas, wherein the liquid inlet flow channel extends from the cooling liquid inlet, the liquid outlet flow channel extends from the cooling liquid outlet, the liquid inlet flow channel and the liquid outlet flow channel are communicated through branch areas, and each branch area comprises a branch flow channel composed of a plurality of Y-shaped branches. And the Y-shaped branches in the branch flow channels in the branch areas are connected with one another through a topological structure based on leaf veins. According to the device, through reasonable branch design and topological structure optimization, the system can realize uniform distribution of cooling liquid in a target area, so that the heat transfer efficiency is improved, and the temperature of battery equipment is effectively reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery thermal management, and in particular relates to a battery liquid cooling plate based on a topological structure. Background Art

[0002] In recent years, with the continuous increase in installed capacity of renewable energy power generation such as wind power and photovoltaic power, the connection of renewable energy to the grid has become increasingly common, but its volatility and intermittent characteristics have brought great challenges to the stable operation of the power grid. Energy storage technology can effectively promote the use of renewable energy, and at the same time help eliminate the peak and valley difference of the power grid during the day and night, smooth the load, and reduce the cost of power supply.

[0003] Among them, battery energy storage has become one of the most widely used energy storage technologies with its advantages of high integration, small footprint, large storage capacity, and convenient transportation. Large-capacity container-type battery energy storage devices are usually composed of many batteries arranged closely. During the charging and discharging process of the energy storage device, as time accumulates, the battery will generate a large amount of reaction heat and Joule heat. Due to the influence of the spatial position of the battery, the heat is difficult to discharge evenly, which will cause uneven heat accumulation and lead to temperature differences in the battery operating environment. When the temperature difference is large, long-term operation will lead to serious inconsistency in the internal resistance and capacity between battery cells, which may cause some batteries to be overcharged or over-discharged, affecting the life and performance of the energy storage device, and in severe cases, it will also cause safety hazards. Therefore, a good thermal management design of battery energy storage is the key to determining the usability, safety and life of the battery energy storage device. Therefore, how to solve the heat dissipation inside the battery pack in the energy storage system has become one of the bottleneck problems in the development of megawatt-level energy storage technology.

[0004] In order to solve the heat dissipation problem of the above-mentioned battery energy storage device during the charging and discharging process, compared with the air-cooled thermal management system and the phase change thermal management system, the liquid-cooled battery thermal management system has the advantages of fast cooling speed, excellent NVH performance and compact structure, and is suitable for battery packs with high heat dissipation requirements. For liquid-cooled thermal management systems, the design of the liquid cooling plate is particularly important, and liquid cooling plates with different flow channel structures have a great impact on the heat dissipation performance of the battery module. A liquid cooling plate with excellent structural design can significantly improve the heat dissipation and temperature uniformity performance of the battery module. Therefore, a liquid cooling plate with a new flow channel structure is provided to achieve better thermal management effects. Utility Model Content

[0005] The purpose of the embodiment of the utility model is to provide a battery liquid cooling plate based on a topological structure, aiming to solve the problems raised in the above-mentioned background technology.

[0006] The embodiment of the utility model is implemented as follows: a battery liquid cooling plate based on a topological structure adopts a total-division-total flow channel structure, including a coolant inlet, a liquid inlet flow channel, a coolant outlet, a liquid outlet flow channel and at least three branch areas;

[0007] Among them, the liquid inlet channel extends from the coolant inlet, the liquid outlet channel extends from the coolant outlet, and the liquid inlet channel and the liquid outlet channel are connected through each branch area, each of the branch areas includes a branch channel composed of a plurality of Y-shaped branches, and the Y-shaped branches in the branch channels in each of the branch areas are interconnected through a topological structure based on leaf veins to optimize the distribution and flow of the coolant.

[0008] According to a further technical solution, three branch areas are provided.

[0009] In a further technical solution, the branch flow channel is divided into two parts, an upper flow channel and a lower flow channel, and the upper flow channel and the lower flow channel are connected by a middle channel with a certain width, and the upper flow channel and the lower flow channel are symmetrically arranged;

[0010] Among them, the upper part of the branch flow channel is connected to the liquid inlet flow channel by three first flow channels of different widths. The three first flow channels are respectively connected to the branch flow channels derived from the Y-shaped branch topology. After topology, six branch flow channels are formed and converge into the middle channel.

[0011] The battery liquid cooling plate based on the topological structure provided by the embodiment of the utility model has the following beneficial effects:

[0012] (1) The total branch total structure ensures that the coolant enters from a single inlet, passes through multiple branch areas, and then flows out from a single outlet, which not only simplifies the system layout but also improves the flow efficiency of the coolant;

[0013] (2) The design based on the Y-shaped branch can ensure that the coolant is evenly distributed at the branch point, avoiding the problem of local overheating or insufficient cooling. At the same time, the topological structure designed with reference to the leaf veins can simulate the efficient fluid transmission system in nature, optimize the flow path of the coolant in the branch area, and improve the heat transfer efficiency;

[0014] (3) Through reasonable branch design and topological structure optimization, the system can achieve uniform distribution of coolant in the target area, thereby improving heat transfer efficiency and effectively reducing the temperature of battery equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of the structure of a battery liquid cooling plate based on a topological structure provided in an embodiment of the utility model;

[0016] Figure 2 This is the pressure simulation result diagram of the liquid cooling plate;

[0017] Figure 3 This is the temperature simulation result diagram of the liquid cooling plate;

[0018] Figure 4 This is the CFD simulation result of the liquid cooling plate.

[0019] In the attached drawings: a coolant inlet 1; a liquid inlet channel 2; a coolant outlet; a liquid outlet channel 4; and a Y-shaped branch 5. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0021] The specific implementation of the present utility model is described in detail below in conjunction with specific embodiments.

[0022] like Figure 1 As shown, a battery liquid cooling plate based on a topological structure is provided in one embodiment of the utility model, which adopts a total-division-total flow channel structure, including a coolant inlet 1, a liquid inlet flow channel 2, a coolant outlet 3, a liquid outlet flow channel 4 and at least three branch areas;

[0023] Among them, the liquid inlet channel 2 extends from the coolant inlet 1, the liquid outlet channel 4 extends from the coolant outlet 3, and the liquid inlet channel 2 and the liquid outlet channel 4 are connected through each branch area, each of the branch areas includes a branch channel composed of a plurality of Y-shaped branches 5, and the Y-shaped branches 5 in the branch channels in each of the branch areas are interconnected through a topological structure based on leaf veins to optimize the distribution and flow of the coolant.

[0024] In the embodiment of the utility model, there are three branch areas. By adopting the total-divided-total structure, the coolant enters from a single inlet, passes through multiple branch areas, and then flows out from a single outlet. At the same time, in conjunction with the topological structure designed with reference to the leaf veins, based on the branch flow channel composed of the Y-shaped branches 5, the coolant is evenly distributed at each branch point, avoiding the problem of local overheating or insufficient cooling.

[0025] like Figure 1 As shown, as a preferred embodiment of the utility model, the branch flow channel is divided into two parts, an upper flow channel and a lower flow channel, and the upper flow channel and the lower flow channel are connected by a middle channel with a certain width, and the upper flow channel and the lower flow channel are symmetrically arranged;

[0026] Among them, the upper part of the branch flow channel is connected to the liquid inlet flow channel 2 by three first flow channels of different widths. The three first flow channels are respectively connected to the branch flow channels formed by the topology of the Y-shaped branch 5. After the topology, six branch flow channels are formed and converge into the middle channel. The coolant flows in the flow channel with a constantly changing cross-section. The flow channel obtained by the "Y"-shaped topology continuously diverts and disturbs the coolant, so that the coolant can fully reach all areas of the flow channel, enhancing the heat exchange effect of the cold plate. The liquid cooling plate with this structure can improve the uniformity of flow, the degree of resistance and the temperature uniformity of the battery pack.

[0027] In the embodiment of the utility model, STAR-CCM+ software is used to simulate the pressure of the liquid cooling plate model with the above structure. The simulation results are as follows: Figure 2 As shown in the figure, the left side is the initial control model and the right side is the designed model. It is found that the pressure drop of the initial control model is 4.85KPa. Based on the initial liquid cooling plate structure, the pressure drop of the optimized model is 3.05KPa. Compared with the initial model, the pressure drop of the optimized liquid cooling plate is reduced by 1.80KPa. From the simulation optimization, it can be seen that the pressure drop of the optimized model is continuously reduced, achieving the optimization purpose.

[0028] The STAR-CCM+ software is used to simulate the temperature of the liquid cooling plate model with the above structure to obtain its temperature distribution cloud map. The simulation results are as follows: Figure 4 As shown, the left side is the initial control model and the right side is the designed model. From the simulation optimization, it can be seen that the refrigerant temperature distribution of the optimized model is greatly improved compared with the initial model, but it is still found that its temperature uniformity is not as good as the initial model, and further optimization is still possible in the future.

[0029] The STAR-CCM+ software was used to perform CFD simulation on the liquid cooling plate model with the above structure to obtain its velocity distribution cloud map. The results are as follows: Figure 4 As shown in the figure, it can be seen from the simulation optimization that the velocity distribution of the optimized model is improved compared with the initial model.

[0030] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery liquid cooling plate based on a topological structure, characterized in that: A total-division-total flow channel structure is adopted, including a coolant inlet, a liquid inlet flow channel, a coolant outlet, a liquid outlet flow channel and at least three branch areas; Among them, the liquid inlet channel extends from the coolant inlet, the liquid outlet channel extends from the coolant outlet, and the liquid inlet channel and the liquid outlet channel are connected through each branch area, each of the branch areas includes a branch channel composed of multiple Y-shaped branches, and the Y-shaped branches in the branch channels in each of the branch areas are interconnected through a topological structure based on leaf veins.

2. The battery liquid cooling plate based on the topological structure according to claim 1, characterized in that: There are three branch areas.

3. The battery liquid cooling plate based on topological structure according to claim 1, characterized in that: The branch flow channel is divided into two parts, an upper flow channel and a lower flow channel, and the upper flow channel and the lower flow channel are connected by an intermediate channel, and the upper flow channel and the lower flow channel are arranged symmetrically; Among them, the upper part of the branch flow channel is connected to the liquid inlet flow channel by three first flow channels of different widths. The three first flow channels are respectively connected to the branch flow channels derived from the Y-shaped branch topology. After topology, six branch flow channels are formed and converge into the middle channel.

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