CN115986256A - Heat transfer enhancement system of 18650 battery package of electric automobile - Google Patents
Heat transfer enhancement system of 18650 battery package of electric automobile Download PDFInfo
- Publication number
- CN115986256A CN115986256A CN202211441713.2A CN202211441713A CN115986256A CN 115986256 A CN115986256 A CN 115986256A CN 202211441713 A CN202211441713 A CN 202211441713A CN 115986256 A CN115986256 A CN 115986256A
- Authority
- CN
- China
- Prior art keywords
- liquid cooling
- change material
- battery
- phase change
- battery pack
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention discloses a heat transfer enhancement system of an electric automobile 18650 battery pack, which comprises a liquid cooling assembly, wherein the liquid cooling assembly is of a frame structure, at least one battery pack groove is arranged in the liquid cooling assembly, a phase change material layer is accommodated in the battery pack groove, and the side edge of the phase change material layer is attached to the liquid cooling assembly; the phase change material layer is provided with a plurality of battery tanks, and graphene membranes are arranged in the battery tanks; the graphene film in each battery jar is cylindrical and is used for completely wrapping the whole side face of the single battery. The high heat-conducting property of the graphene film conducts enhanced heat transfer on the 18650 battery, the phase-change material absorbs heat of the graphene film, the heat dissipation efficiency of the graphene film on the 18650 battery is improved, the liquid cooling assembly further brings out the heat of the phase-change material, the heat transfer characteristics of the graphene film and the phase-change material are improved, the temperature of the single batteries in the power battery pack is reduced, and meanwhile the temperature consistency of the single batteries is guaranteed.
Description
Technical Field
The invention relates to a power battery heat dissipation system, in particular to an enhanced heat transfer system of an electric automobile 18650 battery pack.
Background
The safety problem of electric vehicles, especially the safety problem of power batteries, is receiving more and more attention. The power batteries of the electric automobile have certain inconsistency, namely, the discharge characteristics of each battery are different. Therefore, the temperature rise characteristics of the respective unit cells at the time of discharge operation also differ. When the temperature difference between the unit batteries is too large, the performance of the battery is affected, and the service life of the battery is reduced. When the temperature of the battery rises quickly, and meanwhile, the temperature difference between the single batteries is large, the problems of battery fire, thermal runaway, thermal spread and the like can be caused. Meanwhile, because a large amount of heat is generated in the working process of the battery, the service life of the battery is easily damaged by heat accumulation, and the use cost of a user is improved.
In order to make the battery more efficient and uniform in heat dissipation, many solutions are proposed, and the cooling technology of the existing power battery is air cooling, liquid cooling, phase change material cooling and the like. Because the air convection heat transfer coefficient is lower, and the defects that the temperature of a battery at the air inlet side is low and the temperature of a battery at the air outlet side is high commonly exist in single-use air cooling, the temperature of the battery cannot be uniformly reduced, and therefore, the adoption of liquid instead of air becomes one of means for enhancing heat transfer. Although the cooling effect of the single liquid cooling mode is better than that of air cooling, if the battery discharges with high power, the heat generated by the battery instantly is difficult to ensure to be quickly dissipated.
The phase-change material can absorb heat generated by the battery pack in the charging and discharging processes in the phase-change process, and maintain the temperature uniformity among the battery packs, and is one of the most promising methods for replacing the traditional battery thermal management technology, but the existing single phase-change material has poor heat conduction performance, limited secondary heat storage capacity in a high-temperature environment, and not ideal heat dissipation effect on the battery.
Disclosure of Invention
The invention aims to provide an enhanced heat transfer system of an electric automobile 18650 battery pack.
The invention achieves the purpose through the following technical scheme: the system for enhancing heat transfer of the 18650 electric vehicle battery pack comprises a liquid cooling assembly, a frame structure and a heat exchanger, wherein at least one battery pack groove is arranged in the liquid cooling assembly, a phase change material layer is accommodated in the battery pack groove, and the side edge of the phase change material layer is attached to the liquid cooling assembly; the phase change material layer is provided with a plurality of battery tanks, and graphene films are arranged in the battery tanks; the graphene film in each battery jar is cylindrical and is used for completely wrapping the whole side face of the single battery.
The graphene is sp 2 The hybridized and connected carbon atoms are tightly stacked to form a new material with a single-layer two-dimensional honeycomb lattice structure, and the graphene has good toughness, can be bent, has very good heat conduction performance and is a carbon material with highest heat conduction coefficient. The graphene film is a macroscopic graphene film prepared by overlapping large graphene sheets in a staggered manner, and high thermal conductivity can be realized; then, a micro-fold structure is added into the graphene film, so that the material has enough stretching space during stretching and bending, and high flexibility can be ensured. According to the invention, the graphene film is arranged on the inner wall of the battery jar, and in the preparation process, the graphene film can be placed into the battery jar after wrapping the battery, and the 18650 battery is subjected to enhanced heat transfer through the high heat-conducting property of the graphene film.
18650 there is a certain inconsistency in the discharge characteristics of each battery. Therefore, the temperature rise characteristics of the respective unit cells at the time of discharge operation also differ. When the temperature difference between the unit batteries is too large, the performance of the battery is affected, and the service life of the battery is reduced. When the temperature of the battery rises quickly, and meanwhile, the temperature difference between the single batteries is large, the problems of battery fire, thermal runaway, thermal spread and the like can be caused. Therefore, how to reduce the temperature of the power single battery and ensure that the temperature difference among the single batteries is not large is a problem which needs to be solved urgently at present. Therefore, the following improvements are made in the present invention: the outer side surfaces of two adjacent graphene films in the same battery pack groove are connected, so that the heat transfer of the graphene films is ensured, the temperature consistency between the electric batteries is ensured, and the risks of thermal runaway and thermal spread of the power battery are reduced.
The phase-change material absorbs the heat of the graphene film due to the latent heat and heat storage characteristics, and the heat dissipation efficiency of the graphene film to the 18650 battery is improved. The phase-change material is a composite phase-change material of foam metal copper and paraffin or a composite phase-change material of expanded graphite and paraffin.
Because the temperature rise characteristics of the batteries during discharging work are inconsistent, and the heat dissipation capacity of the middle part of the battery is large generally, the range temperature of the middle area of the battery is high, the range temperature of the areas at two ends is low, in order to keep the temperature of the battery uniform, the phase change material layer has a three-layer structure, the heat conductivity coefficient of the phase change material of the middle layer is higher than that of the phase change materials of the upper layer and the lower layer, the heat conductivity coefficient of the middle layer is high, so that the high heat of the middle area of the 18650 battery can be better absorbed, the temperature of the power battery can be reduced, the heat conductivity coefficients of the phase change materials of the upper layer and the lower layer are low, and the uniformity of the individual temperature of the single battery is ensured. And the layered structure design reduces the cost of the phase-change material while reducing the temperature of the power battery.
Preferably, the phase change material of the intermediate layer and the phase change material of the upper and lower layers have a thermal conductivity difference of 30%. As a preferred embodiment of the present invention, the phase change material of the intermediate layer is a composite phase change material of foam metal copper with a large thermal conductivity and paraffin, and the phase change materials of the upper and lower layers are composite phase change materials of expanded graphite and paraffin.
The liquid cooling assembly comprises a plurality of liquid cooling plates and a plurality of heat pipes, the plurality of liquid cooling plates form a frame structure and are provided with at least one battery pack groove, the liquid cooling plates are all of a hollow structure, all the liquid cooling plates are communicated to form a closed circulation space of cooling liquid, and ethylene glycol is distributed in the liquid cooling assembly; the plurality of heat pipes are vertically arranged and fixed at the upper end and the lower end of the liquid cooling plate, and form an integral structure; the hot pipe is internally distributed with glycol. The liquid cooling assembly further brings out heat of the phase-change material, and heat transfer characteristics of the graphene film and the phase-change material are improved. Ethylene glycol in the liquid cooling subassembly will be in the internal circulation flow, with in each battery cell working process in the battery package produce most heat take the air in, further improved battery cell temperature uniformity, also played the heat dissipation effect to phase change material simultaneously. The ethylene glycol with a certain concentration is arranged in the heat pipe, and the heat absorption property and the heat conductivity of the ethylene glycol are utilized to further take away the heat on the surface of the battery pack and mutually match with the liquid cooling plate, so that the heat dissipation efficiency of the whole heat dissipation system is improved.
Meanwhile, the liquid cooling assembly is of an integral structure, the battery pack is firmly fixed, the integral rigidity and strength of the battery pack are improved, the battery pack can resist the ground vibration of the electric automobile, and the stability of the chassis of the electric automobile is improved. Liquid cooling frame
As an embodiment of the invention, the liquid cooling assembly is of a frame structure formed by four liquid cooling plates, and the interior of the frame structure is divided into at least two battery pack tanks by at least one liquid cooling plate
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, the graphene film is used for wrapping the single battery, and the high heat-conducting property of the graphene film is used for carrying out enhanced heat transfer on the 18650 battery.
2. According to the invention, the phase change material layer is arranged on the outer side of the graphene film, and the heat of the graphene film is absorbed by utilizing the latent heat and heat storage characteristics of the phase change material, so that the heat dissipation efficiency of the graphene film to the 18650 battery is accelerated.
3. The ethylene glycol of certain volume has been laid in the inside confined space of the frame construction that the liquid cooling board of liquid cooling subassembly constitutes, and the ethylene glycol will be at the space inner loop flow, takes away the most heat that produces in the group battery working process, improves group battery work efficiency. The ethylene glycol with a certain concentration is arranged in the heat pipe, and the heat absorption property and the heat conductivity of the ethylene glycol are utilized to be matched with the liquid cooling plate, so that the heat dissipation efficiency of the whole heat dissipation system is improved.
4. The liquid cooling assembly is of an integral structure, the battery pack is firmly fixed, the integral rigidity and strength of the battery pack are increased, the battery pack can resist the ground vibration of the electric automobile, and the stability of the electric automobile chassis is improved.
Drawings
FIG. 1 is a perspective view of an enhanced heat transfer system for an electric vehicle 18650 battery pack of the present invention;
FIG. 2 is a top view of an enhanced heat transfer system for an electric vehicle 18650 battery pack of the present invention;
fig. 3 is a perspective view of a battery pack of an electric vehicle 18650 according to the invention;
FIG. 4 is a schematic diagram of a phase change material layer and a battery pack of the system for enhancing heat transfer of an electric vehicle 18650 battery pack according to the present invention;
fig. 5 is a schematic structural diagram of a liquid cooling assembly of the enhanced heat transfer system of an electric vehicle 18650 battery pack according to the invention.
Detailed Description
The technical scheme of the invention is clearly and completely described below with reference to the accompanying drawings. It should be noted that the embodiment described below is only one embodiment of the present invention, and not all embodiments. Based on the embodiments of the present invention, those skilled in the art can make any changes and modifications to the technical solution of the present invention without creative efforts, and the technical solution belongs to the protection scope of the present invention.
The system for enhancing heat transfer of the battery pack of the electric vehicle 18650 shown in fig. 1-5 comprises a liquid cooling assembly, which is a frame structure. Specifically, the liquid-cooled assembly includes a plurality of liquid-cooled plates 5 and a plurality of heat pipes 6. The four liquid cooling plates 5 form a frame structure, and the interior of the frame structure is divided into four battery pack grooves by the three liquid cooling plates 5. All the liquid cooling plates 5 are of hollow structures, the inner cavities of the liquid cooling plates are communicated to form a closed liquid circulation space, and ethylene glycol is distributed inside the liquid circulation space. The plurality of heat pipes 6 are vertically arranged along the liquid cooling outer plate 5 and fixed on the upper end surface and the lower end surface of the liquid cooling plate 5. As shown in fig. 1 and 5, the liquid cooling plate 5 and the plurality of heat pipes 6 are of an integral structure, so that the battery pack is firmly fixed, the integral rigidity and strength of the battery pack are increased, the battery pack is favorable for resisting the ground vibration of the electric vehicle, and the stability of the chassis of the electric vehicle is increased.
And the four battery pack grooves are respectively used for accommodating one battery pack, and each battery pack comprises a phase change material layer. The side wall of each phase change material layer is attached to the side wall of the outer liquid cooling plate 5; the phase change material layer is provided with a plurality of battery jars 7, and each battery jar 7 inner wall all is equipped with graphite alkene membrane 2. The graphene film in each battery jar is cylindrical and is used for completely wrapping the whole side face of the single battery 1, namely the single battery 1 is placed in the battery jar 7, and the whole side face is wrapped by the graphene film 2. In the preparation process, the graphene film 2 can be placed in a battery jar after wrapping the battery, and the 18650 battery is subjected to enhanced heat transfer through the high heat-conducting property of the graphene film. As shown in fig. 1-2, the graphene films 2 of two adjacent battery cells 7 in the phase change material layer in the same battery cell are connected with each other, so that the heat transfer of the graphene films 2 is ensured, the temperature consistency among the single batteries 1 is ensured, and the risks of thermal runaway and thermal spread of the power battery are reduced.
The phase-change material absorbs the heat of the graphene film 2 due to latent heat and heat storage characteristics, and the heat dissipation efficiency of the graphene film 2 to the 18650 battery is improved. The phase-change material can be a composite phase-change material of foam metal copper and paraffin or a composite phase-change material of expanded graphite and paraffin. In order to improve the heat dissipation uniformity of the battery and ensure the temperature consistency of the battery, as shown in fig. 4, the phase-change material layer has a three-layer structure, and the heat conductivity coefficient of the phase-change material of the middle layer 3 is higher than that of the phase-change materials of the upper and lower layers. The phase change material of the middle layer 3 and the phase change materials of the upper and lower layers have a thermal conductivity difference of 30%. The phase-change material of the middle layer 3 is a composite phase-change material of foam metal copper with a large heat conductivity coefficient and paraffin, and the phase-change materials of the upper layer 4 and the lower layer 4 are composite phase-change materials of expanded graphite and paraffin. The heat conductivity coefficient of the middle layer 3 is high so as to better absorb the high heat in the middle area of the 18650 battery, the temperature of the power battery is favorably reduced, the heat conductivity coefficients of the phase-change materials of the upper layer 4 and the lower layer 4 are lower, and the uniformity of the individual temperature of the single battery 1 is ensured. And the layered structure design reduces the temperature of the power battery and reduces the cost of the phase-change material.
Claims (8)
1. The system is characterized by comprising a liquid cooling component, wherein the liquid cooling component is of a frame structure, at least one battery pack groove is arranged in the liquid cooling component, a phase change material layer is accommodated in the battery pack groove, and the side edge of the phase change material layer is attached to the liquid cooling component; the phase change material layer is provided with a plurality of battery tanks, and graphene films are arranged in the battery tanks; the graphene film in each battery jar is cylindrical and is used for completely wrapping the whole side face of the single battery.
2. The system of claim 1, wherein the outer sides of two adjacent graphene films in the same battery pack slot are connected.
3. The system of claim 1, wherein the phase change material is a composite phase change material of copper foam and paraffin or a composite phase change material of expanded graphite and paraffin.
4. The system of claim 1, wherein the phase change material layer has a three-layer structure, and wherein the thermal conductivity of the phase change material of the middle layer is higher than that of the phase change materials of the upper and lower layers.
5. The system of claim 4, wherein the phase change material of the middle layer and the phase change material of the upper and lower layers have a thermal conductivity that differs by 30%.
6. The system of claim 5, wherein the intermediate layer is made of a composite phase change material of copper foam and paraffin wax having a high thermal conductivity, and the upper and lower layers are made of a composite phase change material of expanded graphite and paraffin wax.
7. The system for enhancing the heat transfer of the battery pack of the electric vehicle 18650 as claimed in any of claims 1-6, wherein the liquid cooling assembly comprises a plurality of liquid cooling plates and a plurality of heat pipes, the plurality of liquid cooling plates form a frame structure and are provided with at least one battery pack groove, the liquid cooling plates are all hollow structures, all the liquid cooling plates are communicated with each other to form a closed circulation space for cooling liquid, and ethylene glycol is distributed in the liquid cooling plates; the heat pipes are vertically arranged and fixed at the upper end and the lower end of the liquid cooling plate to form an integral structure; the hot pipe is internally distributed with glycol.
8. The system of claim 7, wherein the liquid cooling module has a frame structure formed by four liquid cooling plates, and the interior of the frame structure is divided into at least two battery pack slots by at least one liquid cooling plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211441713.2A CN115986256A (en) | 2022-11-17 | 2022-11-17 | Heat transfer enhancement system of 18650 battery package of electric automobile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211441713.2A CN115986256A (en) | 2022-11-17 | 2022-11-17 | Heat transfer enhancement system of 18650 battery package of electric automobile |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115986256A true CN115986256A (en) | 2023-04-18 |
Family
ID=85965466
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211441713.2A Pending CN115986256A (en) | 2022-11-17 | 2022-11-17 | Heat transfer enhancement system of 18650 battery package of electric automobile |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115986256A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106602171A (en) * | 2016-12-22 | 2017-04-26 | 中国矿业大学 | Phase-change material/air-coupled hierarchical battery heat management system |
| CN108808160A (en) * | 2018-05-15 | 2018-11-13 | 上海汽车集团股份有限公司 | High intensity heat transfer structure for cooling down power battery |
| CN110880629A (en) * | 2019-11-19 | 2020-03-13 | 安徽省聚科石墨烯科技股份公司 | Radiating group battery device of phase change material is assisted to graphite alkene |
| CN212848575U (en) * | 2020-07-30 | 2021-03-30 | 华东交通大学 | Battery package heat abstractor based on phase transition and liquid cooling coupling |
| US20210296716A1 (en) * | 2020-03-23 | 2021-09-23 | Global Graphene Group, Inc. | Battery cooling system and method of operating same |
| CN114639866A (en) * | 2022-03-10 | 2022-06-17 | 武汉理工大学 | Lithium ion battery thermal management device based on composite phase change material and liquid cooling |
| CN114824557A (en) * | 2022-04-22 | 2022-07-29 | 北京科技大学 | Battery package cooling system |
-
2022
- 2022-11-17 CN CN202211441713.2A patent/CN115986256A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106602171A (en) * | 2016-12-22 | 2017-04-26 | 中国矿业大学 | Phase-change material/air-coupled hierarchical battery heat management system |
| CN108808160A (en) * | 2018-05-15 | 2018-11-13 | 上海汽车集团股份有限公司 | High intensity heat transfer structure for cooling down power battery |
| CN110880629A (en) * | 2019-11-19 | 2020-03-13 | 安徽省聚科石墨烯科技股份公司 | Radiating group battery device of phase change material is assisted to graphite alkene |
| US20210296716A1 (en) * | 2020-03-23 | 2021-09-23 | Global Graphene Group, Inc. | Battery cooling system and method of operating same |
| CN212848575U (en) * | 2020-07-30 | 2021-03-30 | 华东交通大学 | Battery package heat abstractor based on phase transition and liquid cooling coupling |
| CN114639866A (en) * | 2022-03-10 | 2022-06-17 | 武汉理工大学 | Lithium ion battery thermal management device based on composite phase change material and liquid cooling |
| CN114824557A (en) * | 2022-04-22 | 2022-07-29 | 北京科技大学 | Battery package cooling system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2022517214A (en) | Batteries, power battery packs and electric vehicles | |
| CN107346814B (en) | Battery thermal management system | |
| US20130115506A1 (en) | Thermal Solution for Prismatic Lithium Ion Battery Pack | |
| KR20130086678A (en) | Battery module with novel structure | |
| KR101748645B1 (en) | Battery Module | |
| KR101545166B1 (en) | Cooling Member for Battery Cell | |
| KR101658517B1 (en) | Battery Module with Cooling Member | |
| CN110299484B (en) | Power battery pack based on foamed aluminum material and soft package battery | |
| CN115458832A (en) | Power battery cooling system with synergistic effect of multi-element composite phase change material and water cooling | |
| CN110289377B (en) | Power battery pack based on foamed aluminum material and cylindrical battery | |
| CN115986256A (en) | Heat transfer enhancement system of 18650 battery package of electric automobile | |
| CN216161818U (en) | Heat insulation sheet, battery module and battery pack | |
| CN112086705A (en) | Power battery heat dissipation method based on ionic liquid phase change material and liquid cooling | |
| CN115117510A (en) | Battery pack and electric device comprising same | |
| CN114039122A (en) | Cooling system for power storage battery for electric automobile | |
| CN207409534U (en) | Box type battery with heat exchange structure | |
| CN115241574B (en) | Active enhanced heat dissipation structure for small power battery pack and electric vehicle | |
| CN115719845A (en) | Automobile soft package lithium ion battery enhanced heat transfer system | |
| CN111554999A (en) | Battery pack heat dissipation device and battery system | |
| CN219163517U (en) | Power battery heat radiation structure | |
| CN219476784U (en) | Three-side liquid-cooled large cylindrical battery system | |
| CN216250869U (en) | Heat dissipation module for lithium battery of electric automobile | |
| CN113285142A (en) | Phase change material composite liquid cooled battery thermal management device and application thereof | |
| CN217655953U (en) | Cooling structure, power battery package and power device | |
| CN218602557U (en) | Battery pack |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |