CN110707259A - High-protection-level air-cooled lithium battery pack thermal management system and method - Google Patents

High-protection-level air-cooled lithium battery pack thermal management system and method Download PDF

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Publication number
CN110707259A
CN110707259A CN201911063368.1A CN201911063368A CN110707259A CN 110707259 A CN110707259 A CN 110707259A CN 201911063368 A CN201911063368 A CN 201911063368A CN 110707259 A CN110707259 A CN 110707259A
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China
Prior art keywords
battery
heat pipe
pipe array
battery pack
micro heat
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CN201911063368.1A
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Chinese (zh)
Inventor
赵耀华
徐红霞
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赵耀华
徐红霞
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Priority to CN201910512740.6A priority Critical patent/CN110137407A/en
Priority to CN2019105127406 priority
Application filed by 赵耀华, 徐红霞 filed Critical 赵耀华
Publication of CN110707259A publication Critical patent/CN110707259A/en
Pending legal-status Critical Current

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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/24Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
    • B60L58/26Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries by cooling
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/24Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
    • B60L58/27Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries by heating
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/60Heating or cooling; Temperature control
    • H01M10/61Types of temperature control
    • H01M10/613Cooling or keeping cold
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/60Heating or cooling; Temperature control
    • H01M10/61Types of temperature control
    • H01M10/615Heating or keeping warm
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/60Heating or cooling; Temperature control
    • H01M10/62Heating or cooling; Temperature control specially adapted for specific applications
    • H01M10/625Vehicles
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/60Heating or cooling; Temperature control
    • H01M10/65Means for temperature control structurally associated with the cells
    • H01M10/655Solid structures for heat exchange or heat conduction
    • H01M10/6551Surfaces specially adapted for heat dissipation or radiation, e.g. fins or coatings
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/60Heating or cooling; Temperature control
    • H01M10/65Means for temperature control structurally associated with the cells
    • H01M10/655Solid structures for heat exchange or heat conduction
    • H01M10/6552Closed pipes transferring heat by thermal conductivity or phase transition, e.g. heat pipes
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/60Heating or cooling; Temperature control
    • H01M10/65Means for temperature control structurally associated with the cells
    • H01M10/656Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
    • H01M10/6561Gases
    • H01M10/6563Gases with forced flow, e.g. by blowers
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/60Heating or cooling; Temperature control
    • H01M10/65Means for temperature control structurally associated with the cells
    • H01M10/657Means for temperature control structurally associated with the cells by electric or electromagnetic means
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00Batteries for particular applications
    • H01M2220/20Batteries in motive systems, e.g. vehicle, ship, plane
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/70Energy storage systems for electromobility, e.g. batteries

Abstract

A high protection level air-cooled lithium battery pack thermal management system and method comprises one or more layers of batteries and/or battery modules in a battery pack, a battery pack shell and an external air cooling module, wherein the batteries and/or the upper surface and/or the lower surface are attached with a micro heat pipe array, the part attached to the surfaces of the batteries and/or the battery modules is an evaporation section, at least one end of the micro heat pipe array extends out of the surfaces of the batteries and/or the battery modules, and the extended part is attached to the battery pack shell as a condensation section; the battery pack shell surrounds the battery pack and is of a closed structure, and the battery pack shell is at least provided with a heat-conducting partition plate at the position corresponding to the condensation section; the external air cooling module is attached to the outer surface of the battery pack shell with one side provided with a heat conduction partition plate, air cooling fins are arranged inside the external air cooling module, and a fan is arranged on the side surface of the external air cooling module. The heat dissipation device has the characteristics of high heat dissipation efficiency, no risk of liquid pollution and high protection level.

Description

High-protection-level air-cooled lithium battery pack thermal management system and method
Technical Field
The invention relates to a high-protection-level air-cooled lithium battery pack thermal management system and method, and belongs to the field of battery pack heat dissipation of electric automobiles.
Background
Thermal management of lithium battery packs is critical not only to battery life, but also to battery safety.
The traditional battery pack heat management method, namely the air cooling technology, can not meet the requirement of the protection level of the lithium battery pack, and the great temperature difference between the battery core and the battery core is caused due to the great temperature difference of the inlet and the outlet of the air cooling system, so that the lithium battery is greatly damaged, and therefore, the use value is basically not available at present.
The traditional lithium battery pack heat management method with high protection level generally adopts a liquid cooling mode, a liquid cooling bottom plate adopted by most manufacturers at present only sets up a single liquid cooling plate at the bottom of a battery module, the single liquid cooling plate heat dissipation mode at the bottom of the battery module can cause great temperature difference inside a battery monomer, and the damage to a battery is great when the battery is rapidly charged and discharged and preheated at low temperature. Only tesla employs all battery full side surface liquid cooling mode. However, at present, the liquid cooling medium is directly cooled by antifreeze or refrigeration medium, and the latter is equivalent to a direct expansion evaporator. The direct expansion type cooling of the refrigerating medium has the advantages that due to the fact that the temperature of the refrigerating medium is too low, severe cold impact can be caused on the battery, the temperature difference inside the battery is extremely large, the battery is greatly damaged, and the direct expansion type cooling of the refrigerating medium basically has no practical value. The used antifreeze solution contains water, and for the liquid-cooled bottom plate with a plurality of welding parts, the welding parts are easy to damage in the using process, so that the antifreeze solution inside leaks; all sides are used for Tesla to the liquid cooling pipe, the welding port is located outside the battery pack, once impact occurs, the liquid cooling pipe between the battery cores is damaged, anti-freezing liquid leakage can be caused, the welding port is distributed on all sides, and the probability that the welding port is damaged is high. In either case, the leaked antifreeze may short-circuit the battery pack if it contacts the battery in the battery pack, resulting in a serious safety accident.
In addition, no matter which kind of liquid cooling mode, all rely on active refrigerating system, to the last power lithium cell package of electric automobile, in case the parking is shut down, the liquid cooling system will be in the shutdown state completely, and the local thermal runaway of battery often takes place when the car parking state, and the spontaneous combustion phenomenon of electric automobile when the parking that often takes place is the thermal runaway mostly and causes, and thermal management system does not work when this. Most of thermal runaway is caused by short circuit caused by expansion and damage inside a battery cell due to overheating of local temperature rise (factors such as impurities) of the battery, and therefore the thermal runaway under the condition is difficult to avoid.
In addition, the current liquid cooling system is not energy-saving because the refrigeration system needs to be started to dissipate heat as long as the temperature of the battery is higher than a set value, such as 35-42 ℃, no matter what season the electric vehicle is started, and the refrigeration system needs to consume more battery for storing electricity.
Disclosure of Invention
The invention provides a high-protection-level air-cooled lithium battery pack thermal management system and method, aiming at solving the problems that in the prior art, potential safety hazards are large, heat dissipation efficiency is low, damage to a battery is large, energy is not saved, and the battery pack thermal management system cannot be used in a parking state.
The technical scheme of the invention is as follows:
a high protection level air-cooled lithium battery pack thermal management system is characterized by comprising one or more layers of batteries and/or battery modules inside a battery pack, a battery pack shell and an external air-cooled module,
the battery and/or the battery module is horizontal, the upper surface and/or the lower surface of the battery and/or the battery module is attached with the micro heat pipe array, the part of the micro heat pipe array attached with the surface of the battery and/or the battery module is an evaporation section, the length of the micro heat pipe array is at least larger than the span of the battery and/or the battery module on the layer covered by the micro heat pipe array in one direction, at least one end of the micro heat pipe array extends out of the surface of the battery and/or the battery module, and the extending part is attached with a battery pack shell as a condensation section;
the battery pack shell surrounds the battery pack and is of a closed structure, and the battery pack shell is at least provided with a heat-conducting partition plate at the position corresponding to the condensation section;
the external air cooling module is attached to the outer surface of the battery pack shell with one side provided with a heat conduction partition plate, air cooling fins are arranged inside the external air cooling module, and a fan is arranged on the side surface of the external air cooling module.
Preferably, the batteries and/or the battery modules are distributed in a multi-layer overlapping mode, each layer comprises a plurality of groups, each group comprises a plurality of groups, and the surface of each group is respectively attached to the micro heat pipe array.
Preferably, the upper side surface and the lower side surface of each group of the batteries and/or the battery modules are attached to the micro heat pipe arrays, at least one micro heat pipe array is attached to each side surface, each micro heat pipe array is provided with at least one end extending part, the extending parts are bent towards the vertical direction of the plane of the micro heat pipe array, the upward bending part of the micro heat pipe array positioned at the lower side is a condensation section, the condensation section is attached to the heat conduction partition plate and used for heat dissipation, the downward bending part of the micro heat pipe array positioned at the upper side is an evaporation section, and a heater is attached or connected to the evaporation section and used.
Preferably, at least one micro heat pipe array is attached to one of the upper surface and the lower surface of each group of batteries and/or battery modules, and the extending parts at the two ends are bent towards the same side and attached to the heat-conducting partition plate.
The preferable micro heat pipe array is a flat heat conductor which is formed by extruding a metal material and has a porous structure, a plurality of micro heat pipes which are arranged side by side, are not communicated with each other and operate independently are arranged in the micro heat pipe array, the hydraulic diameter of each micro heat pipe is only 0.2-3.0mm and is even smaller, and the internal phase change working medium is a non-conductive medium. And solid metal strips with the width of 3-10mm and the length same as that of the micro heat pipe array are reserved between the independent heat pipes along the length direction of the heat pipes according to the position size of the mounting holes and can be used for drilling the mounting holes.
Preferably, a compressible and deformable heat conduction gasket is arranged between the micro heat pipe array and the battery and/or the battery module.
Preferably, the lower surface of the micro heat pipe array is also provided with a heater, and the heater can be an electric heating film.
The preferred still includes automatic control system and electric core temperature detecting element, automatic control system is connected with electric core temperature detecting element, fan and heater.
Preferably, the substrate of the external air cooling module is connected or welded with the outer surface of the battery pack shell through a sealing ring, and the battery pack shell is in IP67 grade.
Preferably, the air duct of the air cooling module is in a static pressure box mode or a fan uniform distribution mode.
The heat management system is adopted, and the evaporation section of the micro heat pipe array attached to the surface of the battery and/or the battery module absorbs the heat of the battery and/or the battery module, conducts the heat to the condensation section of the extending part, and then conducts the heat to the external air cooling module through the heat conduction partition plate.
Preferably, when the detected battery cell temperature is higher than a first set value, the control system automatically starts the fan, and the external air cooling module is used for dissipating heat of the battery cell; when the temperature of the battery cell is lower than a first set value, stopping the fan; and when the temperature of the battery is lower than a second set temperature, the heater which is directly or indirectly contacted with the micro heat pipe array is heated, the battery is heated through the micro heat pipe array, and the fan stops running at the moment.
The invention has the beneficial technical effects that:
according to the air-cooled lithium battery pack thermal management system with high protection level, the surface of a battery (electric core) or a battery module is attached with the micro heat pipe array heat conductor, heat is transmitted to the external air cooling module through the heat conduction partition plate, and the temperature of the electric core is managed in an indirect air cooling mode. On the one hand, the unilateral of little heat pipe array and every group electricity core or two side surface laminating, even be located inside electric core like this, its temperature also can be through the little heat pipe array with it laminating give the thermal baffle of its laminating in both ends effective conduction, and then conduct to the battery outside, then through the fin of external air cooling module and in the environment outside battery box is gived off to the inside temperature of battery under the drive of fan, the radiating efficiency is high. On the other hand, the micro heat pipe array is a flat heat conductor with a porous structure formed by extruding a metal material, a plurality of micro heat pipes which are arranged side by side and are not communicated with each other are arranged inside the micro heat pipe array, the hydraulic diameter of each micro heat pipe is only 0.2-3.0mm and even smaller, the pressure bearing capacity of the pipe wall is extremely high, so that the leakage problem can be almost ignored, and the phase change working medium is a trace and non-conductive medium, so that the battery cannot be damaged even if the phase change working medium is damaged and leaked under extreme conditions; and the heat conduction baffle is simultaneously as the protective housing of electric core, separates base plate and battery package to seal the air cooling module base plate through sealing measures such as sealing washer or welding, realize with the complete physics of electric core in the shell is kept apart, effectively prevents the exchange pollution of inside and outside material, guarantees that the protection level of battery package reaches IP67 waterproof and dustproof level, and the air cooling system can thoroughly avoid liquid pollution's risk.
According to the air-cooled lithium battery pack thermal management system with the high protection level, no matter the electric automobile is in a driving state or a parking state, the air-cooled system is in a standby state, when the temperature of the internal battery core is higher than a first set value, such as 35-42 ℃, the control system automatically starts the fan, and the external air-cooled fins are used for carrying out enhanced automatic heat dissipation, so that uncooled energy-saving heat dissipation is realized, automatic heat dissipation is realized when the battery is heated during the parking of the electric automobile, and great safety risks such as thermal runaway are greatly inhibited.
The invention effectively combines the micro heat pipe array with high-efficiency heat transfer with an air cooling mode, and further arranges one or two air cooling modules outside each battery pack through the position and arrangement relationship of the micro heat pipe array and the battery units, thereby effectively conducting the temperature inside the battery, preventing the temperature from being overhigh, ensuring the uniform temperature of the battery and having high heat dissipation efficiency. Because most of thermal runaway is caused by short circuit caused by expansion and damage inside the battery cell due to local temperature rise (factors such as impurities) overheating of the battery, the invention can realize that the thermal management cooling system can effectively run when the vehicle stops, prevent the local temperature of the battery cell from excessively rising through rapid heat dissipation, and avoid most of thermal runaway.
The extending part is bent and attached to the heat-conducting partition plate, so that the contact area between the condensation section of the micro heat pipe array and the heat-conducting partition plate is larger, and the heat-conducting efficiency is improved.
The heat conducting gasket has the functions of heat conduction, electric insulation and ensuring good contact between the micro heat pipe array and the battery.
Drawings
FIG. 1 is an exploded view of an embodiment of a high protection class air-cooled lithium battery pack thermal management system according to the present invention;
FIG. 2 is a schematic view of FIG. 1 assembled;
FIG. 3 is another schematic view from the perspective of FIG. 2;
FIG. 4 is a schematic partial cross-sectional view of one end of a battery cell;
FIG. 5 is a schematic view of example 2 after assembly;
fig. 6 is a schematic cross-sectional view of a battery cell of example 3.
The various reference numbers in the figures are listed below:
1-a battery pack housing; 2-external air cooling module; 3-air cooling fins; 4-a fan; 5-a battery cell; 6-micro heat pipe array, 61-extension part, 7-heat conducting gasket, 8-electric heating film and 9-static pressure box.
Detailed Description
For a clearer understanding of the contents of the present invention, reference will now be made in detail to the accompanying drawings 1 to 5 and specific examples.
Example 1
As shown in fig. 1 to 3, the air-cooled lithium battery pack thermal management system with high protection level of the present embodiment includes a horizontal battery core in a battery pack and an external air-cooled module 2 attached to the outside of a battery pack case 1, where the external air-cooled module includes a fan 4 and air-cooled fins 3. The battery core in the battery pack is divided into four layers, and each layer is divided into three layers in the longitudinal direction and the transverse direction. Wherein, the upper and lower surfaces of three battery units 5 in each layer are respectively jointed with two groups of micro heat pipe arrays 6 extending along the transverse direction. The micro heat pipe array 6 is a flat heat conductor which is formed by extruding a metal material and has a porous structure, a plurality of micro heat pipes which are arranged side by side, are not communicated with each other and operate independently are arranged in the micro heat pipe array, the hydraulic diameter of each micro heat pipe is 1mm, and an internal phase change working medium is a non-conductive medium. And solid metal strips with the width of 3-10mm and the length same as that of the micro heat pipe array are reserved between the independent heat pipes along the length direction of the heat pipes according to the position size of the mounting holes and can be used for drilling the mounting holes. . The micro heat pipe array 6 is a heat conductor with enhanced heat transfer effect, is adhered to the surface of the battery unit 5 through heat conducting silicon glue, is distributed at intervals, and can also be tightly arranged together, the part of the micro heat pipe array 6, which is adhered to the battery unit 5, is an evaporation section, the part of the micro heat pipe array 7, which is longer than each group of battery cores 7, forms a protruding part 61, and the protruding part 61 is used as a condensation section. The battery pack is externally provided with a battery pack shell 1, and the battery pack shell 1 is enclosed into a closed structure. The extending part 61 of each micro heat pipe array 6 bends towards the vertical direction of the micro heat pipe array plane, the vertical part is attached to the inner side of the battery pack shell 1, and a heat-conducting partition plate is arranged at the position, corresponding to the condensation section, of the battery pack shell 1. Air cooling module 2 with the extension 61 of little heat pipe array 6 passes through the heat conduction baffle carries out the heat exchange, and the surface welding of one side of its base plate and the surface of battery package shell 1 also can be connected through the sealing washer, realizes the complete physical isolation of exterior structure and inside battery unit 5, guarantees that the protection level of battery package reaches IP 67. In order to ensure that the temperature difference between the inlet air and the outlet air of the air cooling module is small, the fans 10 can be uniformly distributed as much as possible.
As shown in fig. 1, the protruding portion of the micro heat pipe array 6 located on the upper plane of each group of the battery units 5 is bent downward, and the protruding portion located on the lower plane is bent upward, so that the battery units 5 are enclosed inside to prevent the battery units located outside from outward displacement.
In addition, a heat conductive gasket 7 that can be compressed and deformed may be disposed between the micro heat pipe array 6 and the battery cell 5 as shown in fig. 4.
The battery unit 5 can be replaced by a soft package battery module which is composed of two or more soft package single batteries and is provided with a structural strength shell outside.
The embodiment further comprises an automatic control system and a cell temperature detection unit, wherein the automatic control system is respectively connected with the cell temperature detection unit and the fan 4.
During the use, the evaporation zone of the micro heat pipe array 6 attached to the surfaces of the two sides of each group of battery units 5 absorbs the heat of each battery unit 5 and conducts the heat to the condensation zone formed by the extension part positioned at one end of the micro heat pipe array 6, then the condensation zone conducts the heat to the heat conduction partition plate attached to the condensation zone, the heat conduction partition plate conducts the heat to the air cooling module 2, and the air cooling fins 3 emit the heat under the action of the fan 4. No matter the electric automobile is in a driving state or a parking state, the air cooling system is in a standby state, when the temperature of the lithium battery reaches 35 ℃ which is the first set value, the fan 10 is controlled by the control system to be automatically started, heat is transferred to the external air cooling fins 9 to be automatically radiated, non-refrigeration energy-saving radiation can be achieved when the electric automobile is driven, automatic radiation of heat generated by the battery during parking of the electric automobile can be achieved, great safety risks such as thermal runaway and the like are greatly inhibited, and great energy conservation is achieved.
As shown in fig. 4, the outer surface of the micro heat pipe array may be further provided with an electric heating film 8, the electric heating film 8 is heated when the temperature of the battery is lower than a second set value, for example, 0 ℃, and the battery is heated by the micro heat pipe array, at which time the fan stops operating.
Example 2
In order to ensure that the temperature difference between the inlet air and the outlet air of the air cooling module is small, so as to realize that the temperature difference of all the batteries is not higher than 5 ℃, the air duct of the air cooling module in the embodiment is in a static pressure box mode, as shown in fig. 5, and other structures and working modes are similar to those of the embodiment 1.
Example 3
The internal structure of the battery of this embodiment is as shown in fig. 6, only the lower side is provided with the micro heat pipe array, both sides are provided with the protruding portions 61 and are bent upward, and other structures and principles are consistent with those of embodiment 1.
The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes in the size of the anti-counterfeit plastic package or the size and number of the longitudinal tear lines, which can be easily conceived by those skilled in the art within the technical scope of the present invention, should be covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. A high protection level air-cooled lithium battery pack thermal management system is characterized by comprising one or more layers of batteries and/or battery modules inside a battery pack, a battery pack shell and an external air-cooled module,
the battery and/or the battery module is horizontal, the upper surface and/or the lower surface of the battery and/or the battery module is attached with the micro heat pipe array, the part of the micro heat pipe array attached with the surface of the battery and/or the battery module is an evaporation section, the length of the micro heat pipe array is at least larger than the span of the battery and/or the battery module on the layer covered by the micro heat pipe array in one direction, at least one end of the micro heat pipe array extends out of the surface of the battery and/or the battery module, and the extending part is attached with a battery pack shell as a condensation section;
the battery pack shell surrounds the battery pack and is of a closed structure, and the battery pack shell is at least provided with a heat-conducting partition plate at the position corresponding to the condensation section;
the external air cooling module is attached to the outer surface of the battery pack shell with one side provided with a heat conduction partition plate, air cooling fins are arranged inside the external air cooling module, and a fan is arranged on the side surface of the external air cooling module.
2. The heat management system according to claim 1, wherein the batteries and/or battery modules are stacked in multiple layers, each layer includes multiple groups, each group includes multiple groups, and each group has the surface to which the micro heat pipe array is attached.
3. The heat management system according to claim 2, wherein the upper and lower surfaces of each group of the batteries and/or battery modules are attached to the micro heat pipe arrays, at least one micro heat pipe array is attached to each surface, each micro heat pipe array has at least one end extending part bent in a direction perpendicular to the plane of the micro heat pipe array, the upward bent part of the micro heat pipe array located on the lower side is a condensation section attached to the heat-conducting partition plate for heat dissipation, and the downward bent part of the micro heat pipe array located on the upper side is an evaporation section attached to or connected with a heater for heating the batteries.
4. The thermal management system of claim 2, wherein at least one of the upper and lower surfaces of each group of the batteries and/or battery modules is attached to at least one of the micro heat pipe arrays, and the protruding portions at both ends are bent to the same side and attached to the heat conductive spacer.
5. The heat management system according to claim 1, wherein the micro heat pipe array is a flat heat conductor with a porous structure formed by extruding a metal material, a plurality of micro heat pipes which are arranged side by side and are not communicated with each other and operate independently are arranged in the micro heat pipe array, the hydraulic diameter of each micro heat pipe is 0.2-3.0mm, and the internal phase change working medium is a non-conductive medium.
6. The thermal management system of claim 1, wherein a compressible and deformable thermal gasket is disposed between said micro heat pipe array and said battery and/or battery module.
7. The thermal management system of claim 1, wherein a heater is further disposed on a lower surface of said micro heat pipe array.
8. The thermal management system according to claim 3 or 7, further comprising an automatic control system and a cell temperature detection unit, wherein the automatic control system is connected to the cell temperature detection unit, the fan and the heater respectively.
9. A heat management method for an air-cooled lithium battery pack with high protection grade is characterized in that the heat management system of any one of claims 1 to 8 is adopted, an evaporation section of a micro heat pipe array attached to the surface of a battery and/or a battery module absorbs heat of the battery and/or the battery module, the heat is conducted to a condensation section of an extending part, and then the heat is conducted to an external air-cooled module through a heat conduction clapboard.
10. The method of claim 9, wherein when the detected cell temperature is higher than the first set value, the control system automatically starts the fan to dissipate heat from the cell through the external air cooling module; when the temperature of the battery cell is lower than a first set value, stopping the fan; and when the temperature of the battery is lower than a second set temperature, the heater which is directly or indirectly contacted with the micro heat pipe array is heated, the battery is heated through the micro heat pipe array, and the fan stops running at the moment.
CN201911063368.1A 2019-06-13 2019-11-04 High-protection-level air-cooled lithium battery pack thermal management system and method Pending CN110707259A (en)

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