CN115719845A - Automobile soft package lithium ion battery enhanced heat transfer system - Google Patents
Automobile soft package lithium ion battery enhanced heat transfer system Download PDFInfo
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- CN115719845A CN115719845A CN202211540469.5A CN202211540469A CN115719845A CN 115719845 A CN115719845 A CN 115719845A CN 202211540469 A CN202211540469 A CN 202211540469A CN 115719845 A CN115719845 A CN 115719845A
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- battery
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- lithium ion
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- cooling plate
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- 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 an automobile soft package lithium ion battery enhanced heat transfer system which comprises a liquid cooling plate, a radiator and a composite phase change material structure, wherein the liquid cooling plate is of a frame structure, a plurality of battery tanks used for placing automobile soft package lithium ion batteries are arranged in the liquid cooling plate, the inner wall of each battery tank is provided with a graphene film used for wrapping the automobile soft package lithium ion batteries, the radiator is positioned at the bottom of the liquid cooling plate, the graphene film is arranged at the position corresponding to the battery tanks of the liquid cooling plate and used for covering the bottom of an automobile soft package lithium ion battery monomer, and the composite phase change material structure is arranged at the bottom of the radiator and is attached to the radiator. The graphene film absorbs the heat of the soft package battery, and the liquid cooling plate and the radiator receive the heat of the graphene film, so that the heat dissipation efficiency of the graphene film on the soft package lithium ion battery is improved, and the temperature of the single battery is uniform. The composite phase-change material structure absorbs heat of the radiator according to heat storage and latent heat characteristics, and heat transfer characteristics of the graphene film and the liquid cooling plate are improved.
Description
Technical Field
The invention relates to the technical field of power battery enhanced heat transfer, in particular to a novel automotive soft package lithium ion battery enhanced heat transfer system.
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 enable the battery to dissipate heat more efficiently and uniformly, 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 in high power, the heat generated by the battery instantly is difficult to ensure to be quickly dissipated.
Disclosure of Invention
The invention aims to provide an enhanced heat transfer system for a soft package lithium ion battery of an automobile.
The invention achieves the purpose through the following technical scheme: the automobile soft package lithium ion battery enhanced heat transfer system comprises a liquid cooling plate, a radiator and a composite phase change material structure, wherein the liquid cooling plate is of a frame structure, a plurality of battery tanks used for placing the automobile soft package lithium ion battery are arranged inside the liquid cooling plate, the inner wall of each battery tank is provided with a graphene film used for wrapping the side face of an automobile soft package lithium ion battery monomer, the radiator is located at the bottom of the liquid cooling plate, the graphene film is arranged at the position, corresponding to the battery tank of the liquid cooling plate, and used for covering the bottom of the automobile soft package lithium ion battery monomer, and the composite phase change material structure is arranged at the bottom of the radiator and is attached to the radiator.
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 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. In the invention, the graphene film is mainly used for absorbing the heat of the soft package battery and then conducting the heat to the liquid cooling plate and the radiator, the liquid cooling plate is wrapped on two side faces with larger heat productivity of the battery monomer and has the largest contact area with the battery monomer, most heat generated in the working process of the battery pack is taken away, the temperature of the surface of the battery is reduced, the working efficiency of the battery pack is improved, and the structure of the liquid cooling plate increases the integral rigidity and strength of the battery pack. Radiator absorption batteryThe heat at the bottom of the single body is conducted to the composite phase change material structure, and the temperature at the bottom of the battery single body is reduced. The liquid cooling plate, the graphene film, the radiator and the composite phase change material are matched to timely take away heat of the single batteries, so that the temperature consistency among the single batteries is ensured, and the risks of thermal runaway and thermal spread of the power battery are reduced.
According to the invention, the first silica gel gasket is arranged between the graphene film wrapping the bottoms of the battery monomers and the radiator, on one hand, the first silica gel gasket absorbs heat of the graphene film, on the other hand, the first silica gel gasket is used as a vibration damping element, and the first silica gel gasket reduces vibration from the ground of the soft package battery in the driving process of the electric automobile.
As an embodiment of the invention, the heat radiator comprises an aluminum profile heat radiation structure and a fin structure, wherein grooves corresponding to the battery tanks of the liquid cooling plate in number and position are formed in one surface of the aluminum profile heat radiation structure facing the liquid cooling plate and used for fixing the single soft package battery, and when the bottom of the single soft package battery is embedded in the groove, the single soft package battery can be firmly fixed; the graphene film and the first silica gel gasket are arranged in the groove; the fin structure is arranged at the bottom of the aluminum profile heat dissipation structure, so that the heat dissipation area is increased, and meanwhile, the heat is transferred to the composite phase change material structure below, so that the heat dissipation efficiency of the whole heat dissipation system is improved.
The aluminum profile heat dissipation structure is flat, the length and the width of the aluminum profile heat dissipation structure are both larger than those of the liquid cooling plate, the heat dissipation area is increased, and the heat dissipation efficiency is improved. In one embodiment, the contact area of the aluminum profile heat dissipation structure, the liquid cooling plate and the battery is more than 50% of the area of the top surface of the aluminum profile heat dissipation structure.
The fin structure is composed of a plurality of fins arranged at the bottom of the aluminum profile heat dissipation structure.
The liquid cooling plate comprises an outer frame formed by 4 hollow plates, a plurality of battery tanks are formed in the liquid cooling plate at intervals by the hollow plates, the hollow plates are communicated with one another, and cooling liquid is filled in the battery tanks to dissipate heat of the soft-package battery.
The composite phase-change material structure comprises a composite phase-change material layer, an aluminum plate and a second silica gel gasket from top to bottom, wherein the composite phase-change material layer is composed of foamed aluminum and paraffin, and absorbs heat from a radiator based on latent heat and heat storage characteristics of the phase-change material, so that the heat dissipation efficiency of the whole battery heat transfer system is improved, and an ideal heat dissipation effect is achieved. Meanwhile, according to the vibration reduction characteristic of the foamed aluminum, the vibration excitation from the ground and the longitudinal direction of the electric automobile can be reduced, and the working stability of the soft package battery is improved. The aluminum plate is used for supporting the weight of the battery pack system, and the stability and the safety of the whole battery enhanced heat transfer system are guaranteed. And the second silica gel gasket of bottom has ensured the insulating nature in battery working process, prevents to appear the safety problem that electric leakage short circuit causes, has increased the security and the stability of pure electric vehicles work.
Compared with the prior art, the invention has the following beneficial effects:
(1) Wrap up each laminate polymer battery monomer through the graphite alkene membrane, utilize its high heat conductivility to carry out the intensive heat transfer to laminate polymer battery, guaranteed the uniformity of each regional temperature of monomer battery, avoided laminate polymer battery monomer because of each position temperature inconsistent cause thermal runaway and the thermal spread scheduling problem.
(2) Adopt integral type liquid cooling board to inlay laminate polymer battery in the liquid cooling board, carry out the intensive heat transfer to laminate polymer battery through the liquid cooling board, increased the radiating efficiency of graphite alkene membrane, simultaneously, the liquid cooling board has guaranteed that each regional temperature of battery cell is even unanimous, has also guaranteed the unanimity of the temperature between the battery cell, has reduced the risk of thermal runaway. The rigidity and the intensity of integral type liquid cooling board having increased laminate polymer battery system have reduced the risk that the battery received external force to damage.
(3) The soft package battery is installed and fixed in the recess of aluminium alloy heat radiation structure, is provided with graphite alkene membrane and silica gel gasket in the recess. The graphene film is attached to the bottom surface of the soft package battery, heat at the bottom of the soft package battery is absorbed, and the silica gel gasket can absorb the heat of the graphene film and can also reduce vibration of the soft package battery by utilizing the vibration reduction characteristic of the silica gel gasket.
(4) The fins of the radiator increase the heat dissipation area, increase the heat transfer and accelerate the heat dissipation efficiency of the graphene film, the liquid cooling plate and the silica gel gasket.
(5) The composite phase change material layer formed by the foamed aluminum and the paraffin can reduce the vibration excitation of the electric automobile from the ground and the electric automobile in the longitudinal direction according to the vibration reduction characteristic of the foamed aluminum while absorbing the heat of the fins, and the working stability of the soft package battery system is improved.
(6) Aluminum plate is when supporting battery package system weight, and the silica gel gasket of its bottom can prevent that laminate polymer battery from appearing the electric leakage, has increased the security and the stability of pure electric vehicles work.
Drawings
FIG. 1 is a perspective view of an enhanced heat transfer system for a soft package lithium ion battery of an automobile according to the present invention;
FIG. 2 is a side view of the automobile soft package lithium ion battery enhanced heat transfer system of the present invention;
FIG. 3 is a side view of the heat transfer enhancement system for the automotive soft package lithium ion battery of the present invention;
fig. 4 is a perspective view of a battery pack wrapped with a graphene film and provided with a silica gel gasket at the bottom;
FIG. 5 is a perspective view of the liquid cooling plate and the heat sink;
FIG. 6 is a perspective view of the heat sink of the present invention;
fig. 7 is a perspective view of a composite phase change material structure of the present 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 automobile soft package lithium ion battery enhanced heat transfer system shown in fig. 1-7 is an embodiment of the invention, and comprises a liquid cooling plate 4, a heat radiator 5 and a composite phase change material structure 6. The liquid cooling plate 4 is of a frame structure and is internally provided with a plurality of battery grooves 41 for placing the automobile soft package lithium ion battery 1. Specifically, the liquid cooling plate 4 includes an outer frame composed of 4 hollow plates, a plurality of battery slots are formed in the outer frame by spacing the hollow plates, the hollow plates are communicated with each other, and cooling liquid is filled in the slots to dissipate heat of the battery.
The inner wall of each battery jar 41 is provided with a graphene film 2 for wrapping the outer peripheral surface of the automobile soft package lithium ion battery monomer 1. The soft package battery monomer 1 is arranged in the battery jar 41 and is wrapped by the graphene film 2. Based on the heat absorption characteristic of the liquid cooling plate 4, the heat of the two side faces, with larger heat productivity, of the soft package lithium ion battery monomer 1 transmitted by the graphene film 2 is absorbed, the heat dissipation efficiency of the graphene film on the soft package lithium ion battery is accelerated, and the temperature of the battery monomer can be uniform through the heat dissipation of the liquid cooling plate. The liquid cooling plate 4 wraps the soft-package lithium ion battery to form an integral structure, so that the soft-package lithium ion battery is firmly fixed, and the integral rigidity and strength of the battery pack are increased. The radiator 5 is located at the bottom of the liquid cooling plate 4 and comprises an aluminum profile heat dissipation structure 51 and a fin structure 52. The aluminum profile heat dissipation structure 51 is flat, the length and the width of the aluminum profile heat dissipation structure are larger than those of the liquid cooling plate 4, the heat dissipation area is increased, and the heat dissipation efficiency is improved. The contact area of the aluminum profile heat dissipation structure 51, the liquid cooling plate 4 and the soft package lithium ion battery is 55% of the area of the top surface of the aluminum profile heat dissipation structure 51. The fin structure 52 is composed of a plurality of fins arranged at the bottom of the aluminum profile heat dissipation structure 51.
The one side of aluminium alloy heat radiation structure 51 and the contact of liquid cooling plate 4 is equipped with quantity and position and the recess 511 that the battery jar 41 of liquid cooling plate 4 corresponds for the soft packet of lithium ion battery monomer 1 of fixed car. When the bottom of the automobile soft package lithium ion battery monomer 1 is embedded in the groove 511, the automobile soft package lithium ion battery monomer can be firmly fixed. All be equipped with graphite alkene membrane 2 and first silica gel gasket 3 in each recess 511, first silica gel gasket 3 is located graphite alkene membrane 2 and recess 511 bottom between. When the automobile soft package lithium ion battery monomer 1 is embedded in the groove 511, the bottom of the automobile soft package lithium ion battery monomer is covered by the graphene film 2, and heat of the part is absorbed and conducted by the graphene to be cooled. The first silica gel gasket 3 absorbs heat of the graphene film 2 on one hand, and on the other hand, the first silica gel gasket 3 serves as a vibration reduction element and reduces vibration from the ground in the driving process of the electric automobile on the automobile soft package lithium ion battery monomer 1. The fin structure 52 is arranged at the bottom of the aluminum profile heat dissipation structure 51 and is formed by parallel arrangement of a plurality of fins, so that the heat dissipation area is increased, meanwhile, heat is transferred to the composite phase change material structure 6 below, and the heat dissipation efficiency of the whole heat dissipation system is improved.
The composite phase change material structure 6 is arranged at the bottom of the heat sink 5 and attached to the fin structure 52 of the heat sink 5.
The composite phase change material structure 6 comprises a composite phase change material layer 61, an aluminum plate 7 and a second silica gel gasket 62 from top to bottom, wherein the composite phase change material layer 61 is composed of foamed aluminum and paraffin, and absorbs heat from fins of an absorption aluminum profile radiator of the radiator based on latent heat and heat storage characteristics of the phase change material, so that the heat dissipation efficiency of the whole battery heat transfer system is improved, the heat transfer characteristics of the graphene film 2 and the liquid cooling plate 4 are improved, and an ideal heat dissipation effect is achieved. Meanwhile, according to the vibration reduction characteristic of the foamed aluminum, the vibration excitation of the electric automobile from the ground and the longitudinal direction of the electric automobile can be reduced, and the working stability of the soft package battery is improved. The aluminum plate 7 is used for supporting the weight of the battery pack system, and the stability and the safety of the whole battery enhanced heat transfer system are guaranteed. And the second silica gel gasket 62 of bottom has ensured the insulating nature in battery course of operation, prevents to appear the safety problem that electric leakage short circuit causes, has increased the security and the stability of pure electric vehicles work.
Claims (8)
1. The automobile soft package lithium ion battery enhanced heat transfer system is characterized by comprising a liquid cooling plate, a radiator and a composite phase change material structure, wherein the liquid cooling plate is of a frame structure, a plurality of battery tanks are arranged in the liquid cooling plate and used for containing automobile soft package lithium ion batteries, the inner walls of the battery tanks are provided with graphene films used for wrapping the automobile soft package lithium ion batteries, the radiator is located at the bottom of the liquid cooling plate and corresponds to the position of the battery tank of the liquid cooling plate, the graphene films are arranged for covering the bottom of the automobile soft package lithium ion batteries, and the composite phase change material structure is arranged at the bottom of the radiator and attached to the radiator.
2. The automobile soft package lithium ion battery enhanced heat transfer system of claim 1, wherein a first silica gel gasket is arranged between the graphene film wrapping the bottoms of the battery cells on the radiator and the radiator.
3. The automotive soft package lithium ion battery enhanced heat transfer system according to claim 1 or 2, wherein the heat radiator comprises an aluminum profile heat dissipation structure and a fin structure, one surface of the aluminum profile heat dissipation structure, which faces the liquid cooling plate, is provided with grooves corresponding in number and position to battery grooves of the liquid cooling plate, and the graphene film and the first silica gel gasket are arranged in the grooves; the fin structure is arranged on the aluminum profile heat dissipation structure.
4. The automotive soft package lithium ion battery enhanced heat transfer system of claim 3, wherein the aluminum profile heat dissipation structure is flat, and both the length and the width of the aluminum profile heat dissipation structure are larger than those of a liquid cooling plate.
5. The automotive soft package lithium ion battery enhanced heat transfer system of claim 4, wherein the contact area of the aluminum profile heat dissipation structure with the liquid cooling plate and the battery is more than 50% of the area of the top surface of the aluminum profile heat dissipation structure.
6. The automotive soft package lithium ion battery enhanced heat transfer system of claim 4, wherein the fin structure is composed of a plurality of fins arranged at the bottom of an aluminum profile heat dissipation structure.
7. The automotive soft package lithium ion battery enhanced heat transfer system of claim 1, wherein the liquid cooling plate comprises an outer frame consisting of 4 hollow plates, a plurality of battery tanks are partitioned by a plurality of hollow plates in the outer frame, the hollow plates are communicated with each other, and the liquid cooling plate is filled with cooling liquid.
8. The automobile soft package lithium ion battery enhanced heat transfer system according to claim 1 or 2, wherein the composite phase change material structure comprises a composite phase change material layer, an aluminum plate and a second silica gel gasket from top to bottom, wherein the composite phase change material layer is composed of foamed aluminum and paraffin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211540469.5A CN115719845A (en) | 2022-12-02 | 2022-12-02 | Automobile soft package lithium ion battery enhanced heat transfer system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211540469.5A CN115719845A (en) | 2022-12-02 | 2022-12-02 | Automobile soft package lithium ion battery enhanced heat transfer system |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102010055600A1 (en) * | 2010-12-22 | 2012-06-28 | Daimler Ag | Device for cooling battery e.g. high-voltage battery, in lithium ion technology, utilized as traction battery in partially and electrically driven vehicle e.g. electric car, has heat storage arranged at edge of composite of single cells |
| CN102709965A (en) * | 2012-05-14 | 2012-10-03 | 陈军 | Self-cooling charger |
| CN210052768U (en) * | 2019-04-28 | 2020-02-11 | 朱卫华 | Electric automobile battery safety device |
| CN110994070A (en) * | 2019-12-06 | 2020-04-10 | 上海理工大学 | Thermal management and thermal runaway prevention device for soft package battery |
| CN212463903U (en) * | 2020-08-10 | 2021-02-02 | 深圳市升颂科技有限公司 | Aluminum profile radiator |
-
2022
- 2022-12-02 CN CN202211540469.5A patent/CN115719845A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102010055600A1 (en) * | 2010-12-22 | 2012-06-28 | Daimler Ag | Device for cooling battery e.g. high-voltage battery, in lithium ion technology, utilized as traction battery in partially and electrically driven vehicle e.g. electric car, has heat storage arranged at edge of composite of single cells |
| CN102709965A (en) * | 2012-05-14 | 2012-10-03 | 陈军 | Self-cooling charger |
| CN210052768U (en) * | 2019-04-28 | 2020-02-11 | 朱卫华 | Electric automobile battery safety device |
| CN110994070A (en) * | 2019-12-06 | 2020-04-10 | 上海理工大学 | Thermal management and thermal runaway prevention device for soft package battery |
| CN212463903U (en) * | 2020-08-10 | 2021-02-02 | 深圳市升颂科技有限公司 | Aluminum profile radiator |
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