CN114243149B - Lithium ion battery pack based on magnetorheological fluid and intelligent temperature control method thereof - Google Patents
Lithium ion battery pack based on magnetorheological fluid and intelligent temperature control method thereof Download PDFInfo
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- CN114243149B CN114243149B CN202111187049.9A CN202111187049A CN114243149B CN 114243149 B CN114243149 B CN 114243149B CN 202111187049 A CN202111187049 A CN 202111187049A CN 114243149 B CN114243149 B CN 114243149B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/613—Cooling or keeping cold
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
- H01M10/625—Vehicles
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/63—Control systems
- H01M10/633—Control systems characterised by algorithms, flow charts, software details or the like
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/63—Control systems
- H01M10/635—Control systems based on ambient temperature
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/653—Means for temperature control structurally associated with the cells characterised by electrically insulating or thermally conductive materials
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
- H01M10/6567—Liquids
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/657—Means for temperature control structurally associated with the cells by electric or electromagnetic means
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/658—Means for temperature control structurally associated with the cells by thermal insulation or shielding
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/233—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions
- H01M50/24—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions adapted for protecting batteries from their environment, e.g. from corrosion
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/244—Secondary casings; Racks; Suspension devices; Carrying devices; Holders characterised by their mounting method
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/258—Modular batteries; Casings provided with means for assembling
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/271—Lids or covers for the racks or secondary casings
- H01M50/273—Lids or covers for the racks or secondary casings characterised by the material
- H01M50/282—Lids or covers for the racks or secondary casings characterised by the material having a layered structure
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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 a lithium ion battery pack intelligent temperature control method based on magnetorheological fluid, which comprises the following steps: s1) adding a magneto-rheological liquid film between a box body and a module; s2) adding a temperature probe, a receiver and a magnetic field generator in the battery pack; s3) sequentially and electrically connecting a temperature probe, a receiver and a magnetic field generator; s4) the temperature probe detects the temperature in the battery pack in real time and transmits the temperature data to the receiver; s5) the receiver transmits the temperature data to the magnetic field generator, and cooperates with the magnetic field generator to regulate and control the magnetic field intensity, so as to regulate the heat conductivity of the magnetorheological liquid film, and realize intelligent control of the temperature in the battery pack. According to the scheme, the heat conductivity of the magnetorheological liquid film is changed by changing the magnetic field intensity generated by the magnetic field generator, so that the heat conductivity of the magnetorheological liquid film is changed in real time along with the temperature in the battery pack, intelligent regulation and reasonable management and control of the temperature in the battery pack are realized, and the magnetorheological liquid film can conduct heat effectively and rapidly and can insulate heat.
Description
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery pack based on magnetorheological fluid and an intelligent temperature control method thereof.
Background
In order to cope with the energy safety problem, treat the environmental pollution, and improve the innovation ability of the China automobile industry, the country has developed new energy automobiles greatly in recent years. With the continuous emergence of more favorable policies and acceptance of vast consumer groups in China, new energy automobiles are rapidly developed in technology and market. The lithium ion battery is used as an energy storage and power source of the new energy automobile, and can be said to be the most core component, and the quality of the component directly influences the performance of the whole automobile. The lithium ion battery as a power source exists in a form of an integral battery pack, and is matched with a cooling and heating system to control the temperature of the integral battery pack, so that the electrochemical and safety performance of the battery pack are prevented from being influenced by high temperature or low temperature. Therefore, the cooling and heating system is one of the extremely important key components, and the cooling system on the market at present is basically liquid cooling or air cooling, wherein a certain scale of pipeline is installed in the battery pack, cooling liquid is injected into the pipeline, heat is taken away through cooling liquid flowing, and air cooling is similar to the cooling system. Although the scheme can play a certain role in cooling, the manufacturing cost is increased, the energy density of the battery pack is reduced, and a certain risk of polluting the battery exists. In hot summer or cold winter, the cooling and heating system needs overload work, and even so, the ideal effect is difficult to achieve, and the main reason is that the outside temperature and the box body have non-ideal heat exchange, and the cooling and heating system is specifically expressed as follows: the external environment temperature in summer is high, and the heat generated by the work of the battery pack is difficult to dissipate; the temperature of the external environment is low in winter, and the temperature of the battery core in the battery pack can be balanced with the outside quickly.
In addition, most of the existing pure electric vehicles generally use light materials such as steel, aluminum alloy materials, glass fiber reinforced composite materials, SMC sheet materials, carbon fiber reinforced composite materials and the like as protective shells of battery packs in order to ensure the safety of chassis power batteries, and the materials of the box bodies cannot achieve ideal heat dissipation or heat preservation effects or cannot be taken into consideration.
Aiming at the problems, an intelligent device capable of conducting heat effectively and rapidly and insulating heat is needed at present so as to ensure that the battery pack can be used in a reasonable temperature range, and meanwhile, the device is required to meet the requirements of low cost and convenience for large-scale mass production.
Disclosure of Invention
The invention mainly aims to solve the problems of unsatisfactory heat dissipation and heat preservation effects, high cost and inconvenient large-scale mass production of a cooling and heating system of the traditional lithium ion battery pack, and provides a lithium ion battery pack based on magnetorheological fluid and an intelligent temperature control method thereof. The scheme can effectively and rapidly conduct heat, can insulate heat and preserve heat, has low cost, and is convenient for large-scale mass production.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a lithium ion battery pack intelligent temperature control method based on magnetorheological fluid comprises the following steps: s1) adding a magneto-rheological liquid film between a box body and a module; s2) adding a temperature probe, a receiver and a magnetic field generator in the battery pack; s3) sequentially and electrically connecting a temperature probe, a receiver and a magnetic field generator; s4) the temperature probe detects the temperature in the battery pack in real time and transmits the temperature data to the receiver; s5) the receiver transmits the temperature data to the magnetic field generator, and cooperates with the magnetic field generator to regulate and control the magnetic field intensity, so as to regulate the heat conductivity of the magnetorheological liquid film, and realize intelligent control of the temperature in the battery pack. On the basis of the existing lithium ion battery pack, the magnetorheological liquid film, the temperature probe, the receiver and the magnetic field generator are additionally arranged, the magnetorheological liquid film is arranged between the box body and the module and comprises a film wall and magnetorheological liquid filled in the film wall, and the heat conductivity coefficient of the magnetorheological liquid can change along with the intensity change of an externally-applied magnetic field; the temperature probe is arranged in a cell gap in the module or between the modules and is electrically connected with the receiver; the receiver is electrically connected with the magnetic field generator; the magnetic field range of the magnetic field generator covers the whole magnetorheological liquid film, provides an external magnetic field of the magnetorheological liquid film, and can be controlled manually or intelligently through software. When the temperature probe works, the temperature of the battery pack is detected in real time, the temperature data is transmitted to the receiver, the receiver receives the temperature data and then transmits the data to the magnetic field generator, the temperature probe works cooperatively with the magnetic field generator, the magnetic field intensity generated by the magnetic field generator is regulated and controlled, namely the external magnetic field intensity of the magnetorheological liquid film is regulated and further the heat conductivity coefficient of the magnetorheological liquid film is regulated, so that the heat conductivity coefficient of the magnetorheological liquid film changes in real time along with the temperature in the battery pack, and is the optimal real-time heat conductivity. The intelligent regulation and reasonable management and control to temperature in the lithium ion battery package are realized to this scheme, can effectively quick heat conduction, can adiabatic heat preservation again, and low cost, convenient large-scale mass production.
The intelligent temperature control method of the lithium ion battery pack based on the magnetorheological fluid comprises a box body and a module sealed in the box body, wherein the module comprises an electric core, a wire, copper aluminum bars and a BMS, a magnetorheological liquid film which can conduct heat and insulate heat is arranged between the module and the box body, and the magnetorheological liquid film comprises a film wall and the magnetorheological fluid filled in the film wall; the battery pack also comprises a temperature probe, a receiver and a magnetic field generator, wherein the temperature probe, the receiver and the magnetic field generator are electrically connected in sequence. The invention provides a lithium ion battery pack based on magnetorheological fluid and an intelligent temperature control method thereof, which are provided by the invention, because the existing lithium ion battery pack cooling and heating system has an unsatisfactory heat dissipation and heat preservation effect, high cost and inconvenient large-scale mass production, and comprises a box body and a module sealed in the box body, wherein a magnetorheological liquid film is arranged between the box body and the module, and the module comprises an electric core, a wire, a copper aluminum bar and a BMS; the battery pack is also internally provided with a temperature probe, a receiver and a magnetic field generator which are electrically connected in sequence, and the magnetorheological liquid film, the temperature probe, the receiver and the magnetic field generator form an intelligent temperature control device of the lithium ion battery pack. The magnetorheological liquid film has certain thickness, plastic or rubber can be selected as a film wall material, the inside of the film wall is filled with magnetorheological fluid, the magnetorheological fluid is suspension formed by dispersing micrometer-sized magnetizable particles in mother liquor, the magnetorheological fluid is Newtonian fluid when no magnetic field exists, the suspended particles change into strong magnetism from magnetism to interact with each other under the action of strong magnetic field, the liquid changes into a viscous plastic body instantaneously, the rheological property of the magnetorheological fluid changes sharply, and the working principle is as follows: when the external magnetic field of the magnetorheological fluid is enhanced, the heat conductivity coefficient of the magnetorheological fluid is increased; when the external magnetic field of the magnetorheological fluid is weakened, the heat conductivity coefficient of the magnetorheological fluid is reduced. The temperature probes are arranged in the battery pack and positioned between the gaps of the battery cells or between the modules and used for sensing the temperature of monitoring points, a plurality of temperature probes can be arranged at different positions at the same time to achieve a more accurate and ideal effect, the temperature probes transmit detected temperature data to the receiver, the receiver controls the magnetic field generator to work according to the received temperature data, namely, the magnetic field intensity generated by the magnetic field generator is controlled to change in real time along with the temperature in the battery pack, and when the temperature probes detect that the temperature of the battery pack is too high, the magnetic field intensity is increased by the magnetic field generator, so that the heat conductivity coefficient of the magnetorheological liquid film is increased, heat is rapidly emitted, and the cooling effect of the battery pack is achieved; when the temperature probe detects that the temperature of the battery pack is too low, the magnetic field generator can reduce the magnetic field intensity or stop generating the magnetic field, so that the heat conductivity coefficient of the magnetorheological liquid film is reduced, heat is not easy to dissipate, and the heat preservation effect is achieved. The magnetic field range of the magnetic field generator covers the whole magnetorheological liquid film, an external magnetic field of the magnetorheological liquid film is provided, the heat conductivity coefficient of the magnetorheological liquid film is regulated by regulating the intensity of the external magnetic field, the magnetorheological liquid film can be generally simplified into an electromagnetic coil and a power supply, and the power supply can be independently arranged and also can be provided by a module. The intelligent temperature control device of the lithium ion battery pack is formed by the magnetorheological liquid film, the temperature probe, the receiver and the magnetic field generator, and the cooling and heating system of the assembled battery pack can be used in a combined mode to achieve a more ideal effect, and can also be independently used as a core main control component, so that the lithium ion battery pack can conduct heat effectively and rapidly, can insulate heat and preserve heat, is low in cost, and is convenient for large-scale mass production.
Preferably, the temperature probe is arranged in a cell space or between modules. This scheme sets up the magnetorheological fluid film between box and module, and the magnetorheological fluid film is whole or partial parcel with the module, and temperature probe arranges in electric core space or between the module for respond to the real-time temperature of monitoring point, and the temperature of measuring passes through the data line transmission to the receiver, and the receiver gives magnetic field generator with the signal transmission to with magnetic field generator collaborative work regulation and control magnetic field intensity (i.e. the external magnetic field intensity of magnetorheological fluid film), and then adjusts the thermal conductivity of magnetorheological fluid film, realizes the intelligent management and control to battery package inside temperature.
Preferably, the magnetic field generator comprises an electromagnetic coil and a power source, the power source being electrically connected to the electromagnetic coil. The magnetic field generator can be generally simplified into an electromagnetic coil and a power supply, the power supply can be independently arranged or provided by a module, and the magnetic field range of the magnetic field generator covers the whole magnetorheological liquid film. The magnetic field intensity generated by the magnetic field generator changes in real time along with the temperature detected by the temperature probe, so that the intelligent regulation magneto-rheological liquid film thermal conductivity is the optimal real-time thermal conductivity. In addition, the magnetic field generator of the scheme is determined according to the specific magnetorheological liquid film, and the magnetic field generator specifically comprises the types and the proportions of the components of the magnetorheological liquid, the thickness and the size of the magnetorheological liquid film and the like, so that the specification strength, the size and the like of the magnetic field generator are determined, and the optimal effect is ensured.
Preferably, the magnetic field generator can be controlled manually or intelligently by software. The magnetic field generator can be manually controlled or intelligently controlled by software. When the battery pack works in an external environment with a relatively fixed or small fluctuation range, the magnetic field strength can be manually adjusted to a fixed value; when the battery pack works in an environment with changeable temperature, the magnetic field intensity can be intelligently regulated and controlled through software.
Preferably, the membrane wall material may be plastic or rubber.
Therefore, the invention has the advantages that:
(1) An intelligent temperature control device of the lithium ion battery pack is formed by the magnetorheological liquid film, the temperature probe, the receiver and the magnetic field generator, so that the lithium ion battery pack can conduct heat effectively and rapidly, can insulate heat and preserve heat, is environment-friendly, has low cost, and is convenient for large-scale mass production;
(2) The intelligent regulation and reasonable control of the temperature of the lithium ion battery pack are realized, and the electrochemical performance, the safety performance and the consistency of the lithium ion battery are ensured.
Drawings
Fig. 1 is a flowchart of a method for intelligent temperature control of a lithium ion battery pack based on magnetorheological fluid in an embodiment of the invention.
Fig. 2 is a schematic structural diagram of a lithium ion battery pack based on a magnetorheological fluid in an embodiment of the invention.
FIG. 3 is a schematic view of a part of a magnetorheological fluid film in an embodiment of the invention.
1. The magneto-rheological liquid film comprises a magneto-rheological liquid film 2, a film wall 3, a magneto-rheological liquid 4, a box 5, a module 6, a magnetic field generator 7, a temperature probe 8 and a receiver.
Detailed Description
The invention is further described below with reference to the drawings and detailed description.
As shown in fig. 1, the intelligent temperature control method for the lithium ion battery pack based on the magnetorheological fluid comprises the following steps: s1) adding a magneto-rheological liquid film 1 between a box body 4 and a module 5; s2) adding a temperature probe 7, a receiver 8 and a magnetic field generator 6 in the battery pack; s3) sequentially and electrically connecting the temperature probe 7, the receiver 8 and the magnetic field generator 6; s4) the temperature probe 7 detects the temperature in the battery pack in real time and transmits temperature data to the receiver 8; s5) the receiver 8 transmits temperature data to the magnetic field generator 6, and cooperates with the magnetic field generator 6 to regulate and control the magnetic field intensity, so as to regulate the heat conductivity of the magnetorheological liquid film 1, and realize intelligent control of the temperature in the battery pack. On the basis of the existing lithium ion battery pack, the magnetorheological fluid film 1, the temperature probe 7, the receiver 8 and the magnetic field generator 6 are additionally arranged, the magnetorheological fluid film 1 is arranged between the box body 4 and the module 5 and comprises a film wall 2 and magnetorheological fluid 3 filled in the film wall 2, and the heat conductivity coefficient of the magnetorheological fluid 3 can change along with the intensity change of an external magnetic field; the temperature probe 7 is arranged in the module 5 in a cell gap or between the modules 5 and is electrically connected with the receiver 8; the receiver 8 is electrically connected with the magnetic field generator 6; the magnetic field range of the magnetic field generator 6 covers the whole magnetorheological liquid film 1, provides an external magnetic field of the magnetorheological liquid film 1, and can be controlled manually or intelligently through software. During operation, the temperature probe 7 detects the temperature of the battery pack in real time and transmits the temperature data to the receiver 8, the receiver 8 transmits the data to the magnetic field generator 6 after receiving the temperature data and cooperates with the magnetic field generator 6 to regulate the magnetic field intensity generated by the magnetic field generator 6, namely the external magnetic field intensity of the magnetorheological liquid film 1, so as to regulate the heat conductivity coefficient of the magnetorheological liquid film 1, so that the heat conductivity coefficient of the magnetorheological liquid film 1 changes in real time along with the temperature in the battery pack and is the optimal real-time heat conductivity, and finally the intelligent management and control of the temperature in the battery pack is realized.
As shown in fig. 2, the invention also provides a lithium ion battery pack based on the magnetorheological fluid, and the intelligent temperature control method of the lithium ion battery pack based on the magnetorheological fluid comprises a box body 4 and a module 5 sealed in the box body 4, wherein a magnetorheological liquid film 1 is arranged between the box body 4 and the module 5, and the module 5 comprises an electric core, a wire, a copper aluminum bar and a BMS; the battery pack is also internally provided with a temperature probe 7, a receiver 8 and a magnetic field generator 6 which are electrically connected in sequence, and the magnetorheological liquid film 1, the temperature probe 7, the receiver 8 and the magnetic field generator 6 form an intelligent temperature control device of the lithium ion battery pack. When in manufacture, the module 5 is placed in the box 4, and sealed by riveting, gluing and other modes to manufacture the finished battery pack.
As shown in fig. 3, the magnetorheological fluid film 1 includes a film wall 2 and a magnetorheological fluid 3 filled in the film wall 2, in this embodiment, the film wall 2 is made of polyimide material with high strength and high toughness, and has a wall thickness of 0.1-0.5mm and uniform wall thickness; the magnetorheological fluid 3 is a specially-made micrometer magnetic particle-non-magnetic carrier fluid type magnetorheological fluid, wherein the magnetic particle is carbonyl iron powder, the volume fraction is 20% -40%, the particle diameter is 3-5 mu m, and the carrier fluid is a mixed fluid of silicone oil and a certain mineral oil. Through tests, when the magnetic field strength is increased within the range of 0-2T, the heat conductivity coefficient of the magnetorheological fluid 3 is increased from 0.8W/(m.K) to 30W/(m.K), and the heat conductivity is obviously improved.
As shown in fig. 2, a temperature probe 7 is disposed inside the battery pack, between the cells or between the modules 5, for sensing the temperature of the monitoring point. In order to achieve a more accurate and ideal effect, a plurality of temperature probes 7 can be arranged at different positions at the same time, the temperature probes 7 transmit detected temperature data to the receiver 8, the receiver 8 transmits signals to the magnetic field generator 6 after receiving the signals, and the magnetic field generator 6 is cooperated to regulate and control the magnetic field intensity, namely, the magnetic field intensity generated by the magnetic field generator 6 is controlled to change along with the temperature in the battery pack in real time, so that the temperature in the battery pack is intelligently regulated. When the temperature probe 7 detects that the temperature of the battery pack is too high, the magnetic field generator 6 can increase the magnetic field intensity, so that the heat conductivity coefficient of the magnetorheological liquid film 1 is increased, heat is rapidly emitted, and the cooling effect of the battery pack is achieved; when the temperature probe 7 detects that the temperature of the battery pack is too low, the magnetic field generator 6 can reduce the magnetic field intensity or stop generating the magnetic field, so that the heat conductivity coefficient of the magnetorheological liquid film 1 is reduced, heat is not easy to dissipate, and the heat preservation effect is achieved.
The magnetic field range of the magnetic field generator 6 covers the whole magnetorheological liquid film 1, an external magnetic field of the magnetorheological liquid film 1 is provided, and the heat conductivity coefficient of the magnetorheological liquid film 1 is adjusted by adjusting the intensity of the external magnetic field, so that the intelligent adjustment and reasonable management and control of the internal temperature of the lithium ion battery pack are realized. The magnetic field generator 6 can be generally simplified to a solenoid and a power source, which can be provided separately or by the module 5.
The manufacturing process of the magnetorheological liquid film 1 in the embodiment is as follows: the polyimide-based base film is first blow-molded into a bag-like structure having a fixed shape, thickness and volume, and then the prepared magnetorheological fluid 3 is injected therein. The amount of the magnetorheological fluid 3 which is specifically injected is adjusted according to actual needs, and in the embodiment, the magnetorheological fluid 3 is fully injected, and then the magnetorheological fluid is sealed through a thermoplastic process to form a closed magnetorheological fluid film 1 with the thickness of 5mm.
The battery pack of the embodiment has the energy of 15 DEG, the battery core is made of square aluminum shell 47Ah 622 high-voltage material, the module 5 adopts a 22 series 4 parallel combination mode, and in order to more directly prove the effectiveness of the invention, the embodiment adopts light aluminum alloy with good heat conductivity as the material of the box body 4, and the material characteristics of the box body 4 are high strength and low density.
The embodiment is applied under different temperature scenes and using conditions.
Scene 1 is a simulated winter low-temperature 0 ℃ environment, and the heat preservation effect is tested. The specific experimental scheme is as follows: two groups of battery boxes 1 and 2 with the same 15-DEG C electricity are selected, wherein the 1 is a common battery box which is not subjected to any treatment, and the 2 is the battery box of the embodiment, namely the intelligent temperature control of the magnetorheological liquid film is added on the 1 basis. The two groups of batteries are fully charged at normal temperature, and discharge is started at 1C (current 180A) multiplying power after being placed in a low-temperature 0 ℃ environment for 4 hours. From the view of the monitoring temperature, the temperature of the heat generated by the discharge of the battery cell in the No. 1 box body slightly rises in the whole discharge process, but the heat is quickly dissipated through the contact between the box body and the outside, and the final temperature rises by about 2 ℃; and the temperature of the No. 2 box body is raised by about 15 ℃ due to the heat insulation and preservation effect of the magnetorheological liquid film. Because of the heat preservation effect, the No. 2 box body emits more battery energy.
Scene 2 is a simulated summer 30 ℃ environment, and the heat dissipation effect is tested. The two groups of batteries are fully charged at normal temperature, and discharge is started at a 1C (current 180A) multiplying power after being placed in an environment of 30 ℃ for 4 hours. From the monitoring temperature, the temperatures in the No. 1 and No. 2 boxes are similar, and the fact that the magnetic field generator works in the discharging process of the No. 2 boxes increases the heat conductivity of the magnetorheological liquid film, so that the No. 1 and No. 2 boxes have the same heat dissipation effect.
In general, the scheme can effectively give consideration to practical application at different temperatures throughout the year, is particularly suitable for being used in areas with large day-night temperature difference, such as Xinjiang desert areas in China, and can enable the battery pack to insulate heat at night and preserve heat in daytime.
Claims (6)
1. The intelligent temperature control method for the lithium ion battery pack based on the magnetorheological fluid is characterized by comprising the following steps of:
s1: a magnetorheological liquid film is additionally arranged between the box body and the module;
s2: a temperature probe, a receiver and a magnetic field generator are additionally arranged in the battery pack;
s3: the temperature probe, the receiver and the magnetic field generator are electrically connected in sequence;
s4: the temperature probe detects the temperature in the battery pack in real time and transmits the temperature data to the receiver;
s5: the receiver transmits temperature data to the magnetic field generator, and cooperates with the magnetic field generator to regulate the magnetic field intensity, so as to regulate the heat conductivity of the magnetorheological liquid film, and realize intelligent control of the temperature in the battery pack.
2. The intelligent temperature control method for the lithium ion battery pack based on the magnetorheological fluid is characterized in that the magnetorheological fluid film which can conduct heat and insulate heat is arranged between the box body and the module, and comprises a film wall and the magnetorheological fluid filled in the film wall; the wall thickness of the film wall is 0.1-0.5mm, and the wall thickness is uniform; the volume fraction of the magnetorheological fluid is 20-40%, and the particle diameter is 3-5 mu m; the battery pack also comprises a temperature probe, a receiver and a magnetic field generator, wherein the temperature probe, the receiver and the magnetic field generator are sequentially and electrically connected, and the temperature probe is arranged in a space between the battery cells or between the battery modules.
3. The lithium ion battery pack based on the magnetorheological fluid according to claim 2, wherein the magnetorheological fluid is a specially-made micrometer magnetic particle-nonmagnetic carrier fluid type magnetorheological fluid, the magnetic particles are carbonyl iron powder, and the carrier fluid is a mixed fluid of silicone oil and a certain mineral oil.
4. The magnetorheological fluid based lithium ion battery pack of claim 2, wherein the magnetic field generator comprises an electromagnetic coil and a power source electrically connected to the electromagnetic coil.
5. The magnetorheological fluid based lithium ion battery pack according to claim 2, wherein the membrane wall material is plastic or rubber.
6. The magnetorheological fluid-based lithium ion battery pack according to claim 2 or 4, wherein the magnetic field generator is manually controllable or intelligently controllable by software.
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