CN-224232735-U - Stepped phase-change battery thermal management system

Abstract

The utility model relates to a stepped phase change battery thermal management system which is characterized by comprising a battery module, a liquid cooling plate and stepped phase change materials, wherein the battery module comprises more than one single battery, each single battery is adjacently arranged, a phase change space is reserved between the adjacent single batteries, the liquid cooling plate is arranged at the end part of each single battery, the stepped phase change materials comprise a first phase change material and a second phase change material, the first phase change material and the second phase change material are respectively arranged in the phase change space, the first phase change material is located in the direction of the phase change space away from the liquid cooling plate, the second phase change material is located in the other direction of the phase change space and is in contact with the liquid cooling plate, and the phase change temperature of the first phase change material is higher than that of the second phase change material. The method is characterized in that a stepped phase change material is adopted, so that the balance of the internal temperature of the battery is maintained in the process of cooling the battery by liquid cooling, the service life of the battery is prolonged, and the service power of the battery is ensured.

Inventors

• SUN WANCHUN
• Mao Chuanxi
• LI ZHEKAI
• ZOU LISHENG
• LIANG JUNXI
• ZHANG ANYUAN
• Ou Wanyi
• ZHU PEILIN
• ZHOU ZERUI

Assignees

• 顺德职业技术大学

Dates

Publication Date

20260512

Application Date

20250516

Claims (2)

1. 1. A stepped phase change battery thermal management system is characterized by comprising The battery module comprises more than one single battery (1), wherein each single battery (1) is adjacently arranged, and a phase change space is reserved between the adjacent single batteries (1), and the liquid cooling plate (2) is arranged at the end part of the single battery (1); The liquid cooling device comprises a liquid cooling plate (2), and is characterized by comprising a stepped phase change material, wherein the stepped phase change material comprises a first phase change material (3) and a second phase change material (4), the first phase change material (3) and the second phase change material (4) are respectively arranged in a phase change space, the first phase change material (3) is positioned in the direction of the phase change space away from the liquid cooling plate (2), the second phase change material (4) is positioned in the other direction of the phase change space and is in contact with the liquid cooling plate (2), and the phase change temperature of the first phase change material (3) is higher than that of the second phase change material (4).
2. 2. The stepped phase change battery thermal management system according to claim 1, characterized in that the volume ratio of the first phase change material (3) and the second phase change material (4) in the phase change space is 7:3 to 3:7.

Description

Stepped phase-change battery thermal management system Technical Field The utility model relates to a thermal management system of a stepped phase-change battery. Background At present, a new energy battery is more and more popular, the battery can generate heat in the use process, in order to ensure that the temperature of the battery is in a controllable range in the use process, a liquid cooling plate is arranged at one end part of the battery to reduce the temperature of the battery in the use process, the structure has the following conditions that the temperature of one end of the battery, which is close to the liquid cooling plate, of the liquid cooling plate is lower than the temperature of one end, which is far away from the liquid cooling plate, of the battery in the cooling process, the heat of the battery is unbalanced, the consequences are that 1, the capacity imbalance and the power are reduced, the reaction rate of the battery in a high-temperature area is accelerated, the reaction rate in a low-temperature area is reduced, the capacity difference between monomers is increased (the capacity reduction in the high-temperature area is accelerated, the capacity in the low-temperature area is kept but the whole energy storage capacity is reduced), the activity difference of electrode materials is increased, the discharge rate is limited, the output power of the system is reduced, 2, the aging of the battery is accelerated, the side reaction in the high-temperature area (such as lithium precipitation and electrolyte decomposition) is accelerated, the capacity utilization rate in the low-temperature area is reduced, the full life cycle is increased by more than 30%, the temperature difference is continuously increased by 57%, and the capacity attenuation rate is increased in a nonlinear process. Disclosure of Invention The utility model aims to overcome the defects of the prior art and provide a stepped phase change battery thermal management system, which adopts a stepped phase change material, so that the balance of the internal temperature of the battery is maintained in the process of cooling the battery by liquid cooling, the service life of the battery is prolonged, and the service power of the battery is ensured. In order to achieve the above object, the present utility model provides a thermal management system for a stepped phase change battery, comprising The battery module comprises more than one single battery, each single battery is adjacently arranged, and a phase change space is reserved between the adjacent single batteries; The stepped phase change material comprises a first phase change material and a second phase change material, wherein the first phase change material and the second phase change material are respectively arranged in a phase change space, the first phase change material is positioned in the direction of the phase change space far away from the liquid cooling plate, the second phase change material is positioned in the other direction of the phase change space and is in contact with the liquid cooling plate, and the phase change temperature of the first phase change material is higher than that of the second phase change material. In the technical scheme, the volume ratio of the first phase change material to the second phase change material in the phase change space is 7:3 to 3:7. In the technical scheme, the first phase change material is composed of sodium acetate trihydrate, polyethylene glycol, sodium pyrophosphate decahydrate, a heat conduction enhancer, urea and hydrogel. In the technical scheme, the first phase change material comprises 62-75wt% of sodium acetate trihydrate, 3-8wt% of polyethylene glycol, 3-8wt% of sodium pyrophosphate decahydrate, 3-5wt% of heat conduction enhancer, 2-5wt% of urea and 20-25wt% of hydrogel. In the technical scheme, the second phase change material is composed of disodium hydrogen phosphate dodecahydrate, sodium carbonate decahydrate and hydrogel. In the technical scheme, the mass percentage of the second phase change material is 55-65wt% of disodium hydrogen phosphate dodecahydrate, 10-20wt% of sodium carbonate decahydrate and 20-25wt% of hydrogel. In the technical scheme, the hydrogel consists of polyvinyl alcohol and sodium alginate. In the technical scheme, the dry basis mass ratio of the polyvinyl alcohol to the sodium alginate is 3:1-4:1. Compared with the prior art, the utility model has the advantages that the stepped phase change material is adopted, so that the balance of the internal temperature of the battery is maintained in the process of cooling the battery by liquid cooling, the service life of the battery is prolonged, and the service power of the battery is ensured. Drawings Fig. 1 is a schematic structural view of the present utility model. Detailed Description The following describes the embodiments of the present utility model further with reference to the drawings. The description of these embodiments i