CN-224232733-U - Uniform temperature battery thermal management system based on liquid cooling and phase change materials

Abstract

A uniform temperature battery thermal management system based on liquid cooling and phase change materials comprises a heat transfer frame and a battery module, wherein the heat transfer frame comprises a bottom plate and a vertical structure, liquid flow channels for heat exchange fluid to flow are formed in the bottom plate and the vertical structure, the battery module comprises a heat conduction metal sheet, the battery module is arranged in the heat transfer frame, battery mounting positions are arranged on the side faces of the heat conduction metal sheet, the heat transfer frame is filled with the phase change materials, and the heat conduction metal sheet is in direct contact with the heat transfer frame and the phase change materials. The battery is placed in the battery mounting position surrounded by the heat-conducting metal sheets, the heat-conducting metal sheets are contacted with the battery, the phase-change material and the liquid cooling plate at the same time, the phase-change material can effectively maintain the uniformity and stability of the temperature of the battery, and the heat transfer frame and the battery directly exchange heat due to the liquid cooling plate structure combined by the bottom plate and the vertical structure, so that the temperature adjustment time of the battery is short, the response speed is high, and the battery heat management device belongs to the technical field of battery heat management.

Inventors

• GAN YUNHUA
• Xie Xuejie

Assignees

• 华南理工大学

Dates

Publication Date

20260512

Application Date

20250509

Claims (10)

1. 1. A uniform temperature battery thermal management system based on liquid cooling and phase change materials is characterized by comprising a heat transfer frame and a battery module; The heat transfer frame comprises a bottom plate and a vertical structure, liquid flow channels for heat exchange fluid to flow are formed in the bottom plate and the vertical structure, the battery module comprises a heat conduction metal sheet, the battery module is arranged in the heat transfer frame, battery installation positions are arranged on the side faces of the heat conduction metal sheet, phase change materials are filled in the heat transfer frame, and the heat conduction metal sheet is in direct contact with the heat transfer frame and the phase change materials.
2. 2. The heat management system of a battery with uniform temperature property based on liquid cooling and phase change materials according to claim 1, wherein the heat conducting metal sheet is perpendicular to the bottom plate, the bottom end of the heat conducting metal sheet is directly contacted with the bottom plate, and the side edge of the heat conducting metal sheet is directly contacted with the vertical structure.
3. 3. The homogeneous battery thermal management system based on liquid cooling and phase change materials according to claim 1, wherein the liquid flow channel in the bottom plate comprises a first flow channel and a second flow channel; The first flow channel and the second flow channel respectively comprise a plurality of main diamond-shaped branches connected in series, the bottom plate is provided with a plurality of side interfaces and liquid inlets, the plurality of side interfaces are respectively connected with two ends of the first flow channel and two ends of the second flow channel, and the liquid inlets are connected with the first flow channel and the second flow channel, so that heat exchange fluid flows into the first flow channel and the second flow channel through the liquid inlets and flows out of the bottom plate through the side interfaces; A plurality of middle diamond-shaped branches are connected between the first flow channel and the second flow channel, and the plurality of middle diamond-shaped branches are connected in series.
4. 4. The heat management system of the uniform temperature battery based on the liquid cooling and phase change materials, according to claim 3, is characterized in that the side interfaces are connected with two ends of the first flow channel and two ends of the second flow channel through a trunk, the width of the trunk is 8-10 mm, and the widths of the main diamond-shaped branch and the middle diamond-shaped branch are 2.5-3 mm.
5. 5. A heat management system of a uniform temperature battery based on liquid cooling and phase change materials according to claim 3, wherein the vertical structure comprises a first side plate facing left and right, the liquid flow passage in the first side plate comprises n first horizontal main passages, n is not smaller than 2, the n first horizontal main passages are sequentially arranged in parallel from top to bottom, adjacent first horizontal main passages are communicated through a first vertical branch, the first horizontal main passage at the lowest is connected with two bottom interfaces, and the two bottom interfaces are respectively connected with the first flow passage and the second flow passage through side interfaces.
6. 6. The heat management system of a homogeneous battery based on liquid cooling and phase change materials according to claim 5, wherein the vertical structure comprises a second side plate facing in the front-rear direction, the liquid flow passage in the second side plate comprises n second horizontal trunk lines, the second horizontal trunk lines are composed of confluence sections and diversion sections which are alternately connected, and the second horizontal trunk lines are provided with arc-shaped branches connected with the diversion sections in parallel; The n second horizontal trunk roads are sequentially arranged in parallel from top to bottom, the adjacent second horizontal trunk roads are communicated through a second vertical branch road, and the second horizontal trunk road at the uppermost part is connected with a liquid outlet; the n first horizontal trunk lines are correspondingly communicated with the n second horizontal trunk lines.
7. 7. The heat management system of a homogeneous battery based on liquid cooling and phase change materials according to claim 6, wherein the vertical structure is an integrated structure, and the first horizontal trunk, the second horizontal trunk, the first vertical branch, the second vertical branch and the arc branch are rectangular and have a thickness of 1.5mm; The width of the first horizontal trunk road and the second horizontal trunk road is 8-10 mm, and the width of the first vertical branch road, the second vertical branch road and the arc-shaped branch road is 2-4 mm.
8. 8. The heat management system of the uniform temperature battery based on the liquid cooling and phase change materials according to claim 1, wherein the heat conduction metal sheet consists of a bending section and a straight section, the bending section is continuously folded for m times, and the direction of each bending is opposite to the direction of the last bending to form m triangular prism-shaped battery mounting positions; the flat section is disposed on one side of the bent section such that the flat section encloses the opening of the battery mounting location on one side.
9. 9. The heat management system of the uniform temperature battery based on the liquid cooling and phase change materials according to claim 8, wherein the heat conduction metal sheet is provided with round through holes, m folds on the bending section divide the heat conduction metal sheet into m+1 heat conduction surfaces, the number of the through holes in each heat conduction surface is five, and the five through holes are arranged in a quincuncial manner.
10. 10. The heat management system of a homogeneous battery according to claim 1, wherein the heat conducting metal sheet is made of aluminum.

Description

Uniform temperature battery thermal management system based on liquid cooling and phase change materials Technical Field The utility model relates to the technical field of battery thermal management, in particular to a uniform temperature battery thermal management system based on liquid cooling and phase change materials. Background Under the background of global warming and increasingly severe environmental pollution, the popularization of new energy automobiles has become an important issue in the energy field. As a core component of a pure electric vehicle, performance of a power battery is highly dependent on optimization of thermal management techniques. However, current battery temperature control still faces two challenges, namely excessive local area temperature variation and insufficient overall heat dissipation efficiency. Research shows that the temperature fluctuation can obviously influence the stability of the battery, namely, the battery capacity can be attenuated by more than 40% under the extremely high-temperature or low-temperature environment, and frequent cold and hot alternation can further accelerate the aging of the battery, even trigger potential safety hazards such as internal short circuit, smoking, fire and the like. Therefore, an intelligent temperature regulation system is developed, and the intelligent temperature regulation system becomes a core break for guaranteeing the safe operation of the battery and prolonging the service life. At present, the cooling mode of the lithium battery mainly comprises air cooling, liquid cooling, phase change material cooling and heat pipe cooling. Various cooling modes have advantages and disadvantages, and the liquid cooling mode has high heat conduction coefficient and high heat transfer efficiency, so that the liquid cooling mode is widely applied to heat management of lithium batteries. At present, research on a liquid cooling system mainly focuses on optimization of geometric parameters of a flow channel and a cooling plate structure. Referring to the related research results, the heat dissipation effect of the battery pack is influenced by changing the shape of the flow channel, the width of the flow channel or the flow velocity of the heat exchange fluid. The phase change material is used for cooling the battery through the change of the physical properties of the phase change material, and the battery cooling device belongs to passive cooling and has a simple structure. However, when the battery is operated in a high-temperature environment, the phase-change material may be liquefied rapidly, and the battery temperature is high due to the low thermal conductivity of the phase-change material, which is one of the factors that prevent the phase-change material from being applied to the battery thermal management system. Disclosure of utility model Aiming at the technical problems in the prior art, the utility model aims to provide a battery thermal management system with uniform temperature based on liquid cooling and phase change materials, which adopts a mode of combining liquid cooling and phase change material cooling to cool a battery pack, so that the battery can have good uniform temperature while obtaining better cooling effect. In order to achieve the purpose, the technical scheme is that the uniform temperature battery thermal management system based on liquid cooling and phase change materials comprises a heat transfer frame and a battery module, wherein the heat transfer frame comprises a bottom plate and a vertical structure, liquid flow channels for heat exchange fluid to flow are arranged in the bottom plate and the vertical structure, the battery module comprises a heat conduction metal sheet, the battery module is arranged in the heat transfer frame, battery mounting positions are arranged on the side faces of the heat conduction metal sheet, the phase change materials are filled in the heat transfer frame, and the heat conduction metal sheet is in direct contact with the heat transfer frame and the phase change materials. After adopting this kind of structure, the battery is placed in the battery installation position that the heat conduction sheetmetal encloses, closely laminates with phase change material and heat conduction sheetmetal, and phase change material can maintain the even stability of battery temperature effectively, and owing to adopted the liquid cooling plate structure that bottom plate and vertical structure combined together, increased the liquid cooling plate area, make heat transfer frame not only can cool off the battery in the vertical direction, also directly exchanges heat with the battery at the bottom plate of battery bottom, and is short to the temperature regulation time of battery, and response speed is fast. Preferably, the heat conducting metal sheet is perpendicular to the bottom plate, the bottom end of the heat conducting metal sheet is in direct contact with the bottom plate, and