CN114243149A - 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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- CN114243149A CN114243149A CN202111187049.9A CN202111187049A CN114243149A CN 114243149 A CN114243149 A CN 114243149A CN 202111187049 A CN202111187049 A CN 202111187049A CN 114243149 A CN114243149 A CN 114243149A
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- 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
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- H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
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- H01M10/633—Control systems characterised by algorithms, flow charts, software details or the like
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- 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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- 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
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- 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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- 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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- 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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- 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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Abstract
The invention discloses an intelligent temperature control method for a lithium ion battery pack based on magnetorheological fluid, which comprises the following steps of: s1) adding a magnetorheological liquid film between the box body and the module; s2) adding a temperature probe, a receiver and a magnetic field generator in the battery pack; s3) electrically connecting the temperature probe, the receiver and the magnetic field generator 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 the temperature data to the magnetic field generator, and the receiver and the magnetic field generator work cooperatively to regulate and control the magnetic field intensity, so that the thermal conductivity of the magnetorheological liquid film is regulated, and the intelligent management and control of the temperature in the battery pack are realized. This scheme changes the heat conductivity of magnetic current change liquid film through the magnetic field intensity that changes magnetic field generator and produce for the heat conductivity of magnetic current change liquid film changes in real time along with temperature in the battery package, with this realization to the intelligent regulation and the reasonable management and control of temperature in the battery package, can not only effectively quick heat conduction, can also thermal insulation.
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 deal with the problem of energy safety, treat environmental pollution, improve the innovation capability of the automobile industry in China in a crossing manner and the like, in recent years, the nation has been vigorously developing new energy automobiles. With the continuous emergence of more favorable policies and the approval of wide consumer groups in China, new energy automobiles are rapidly developed in the technology and the market. The lithium ion battery is used as an energy storage and power source of the new energy automobile, so to speak, 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 the 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 influence on the electrochemistry and safety performance of the battery pack caused by high temperature or low temperature is avoided. Therefore, the cooling and heating system is one of the most important key components, the cooling system in the current market is basically liquid cooling or air cooling, the liquid cooling is generally that a pipeline with a certain scale is installed in the battery pack, cooling liquid is injected into the pipeline, heat is taken away through the flowing of the cooling liquid, and the air cooling is similar to the air cooling. Although the above scheme can play a certain cooling role, the manufacturing cost is increased, the energy density of the battery pack is reduced, and meanwhile, a certain risk of polluting the battery exists. In hot summer or cold winter, the cooling and heating system needs to work with overload, and even then it is difficult to achieve the ideal effect, mainly because of the non-ideal heat exchange between the outside temperature and the tank, as shown in the following: the external environment temperature is high in summer, and heat generated by the working of the battery pack is difficult to dissipate; in winter, the temperature of the external environment is low, and the temperature of the battery core in the battery pack can be balanced with the outside quickly.
In addition, most of pure electric vehicles generally select lightweight 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 box body materials cannot achieve ideal heat dissipation or heat preservation effects or cannot give consideration to both the heat dissipation and the heat preservation effects.
To the above-mentioned problem, need urgent at present an intelligent device that can effectively quick heat conduction and thermal insulation can guarantee that the battery package can use at reasonable temperature range, still require to satisfy the demand that low cost, convenient scale mass production can be satisfied simultaneously.
Disclosure of Invention
The invention mainly aims to solve the problems of unsatisfactory heat dissipation and heat preservation effects, high cost and inconvenience for large-scale mass production of the existing cooling and heating system of the lithium ion battery pack, and provides the lithium ion battery pack based on magnetorheological fluid and an intelligent temperature control method thereof. This scheme can effective quick heat conduction again can adiabatic heat preservation, and low cost, makes things convenient for scale mass production.
In order to achieve the purpose, the invention adopts the following technical scheme:
an intelligent temperature control method for a lithium ion battery pack based on magnetorheological fluid comprises the following steps: s1) adding a magnetorheological liquid film between the box body and the module; s2) adding a temperature probe, a receiver and a magnetic field generator in the battery pack; s3) electrically connecting the temperature probe, the receiver and the magnetic field generator 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 the temperature data to the magnetic field generator, and the receiver and the magnetic field generator work cooperatively to regulate and control the magnetic field intensity, so that the thermal conductivity of the magnetorheological liquid film is regulated, and the intelligent management and control of the temperature in the battery pack are realized. The invention adds magneto-rheological liquid film, temperature probe, receiver and magnetic field generator on the basis of the existing lithium ion battery pack, the magneto-rheological liquid film is arranged between the box body and the module, and comprises a film wall and magneto-rheological liquid filled in the film wall, and the heat conductivity coefficient of the magneto-rheological liquid can change along with the intensity change of an external magnetic field; the temperature probe is arranged in the battery cell gap or between the modules in the module 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 manually controlled or intelligently controlled through software. When the temperature sensor works, the temperature probe detects the temperature of the battery pack in real time and transmits the temperature data to the receiver, the receiver transmits the data to the magnetic field generator after receiving the temperature data, and the receiver and the magnetic field generator work cooperatively to regulate and control the magnetic field intensity generated by the magnetic field generator, namely the external magnetic field intensity of the magnetorheological liquid film, so that the heat conductivity coefficient of the magnetorheological liquid film is regulated, the heat conductivity coefficient of the magnetorheological liquid film is changed in real time along with the temperature in the battery pack, and the optimal real-time heat conductivity is achieved. This scheme realizes intelligent regulation and reasonable management and control to the temperature in the lithium ion battery package, can effective quick heat conduction again can adiabatic heat preservation, and low cost, makes things convenient for scale mass production.
A lithium ion battery pack based on magnetorheological fluid adopts the intelligent temperature control method of the lithium ion battery pack based on the magnetorheological fluid, and comprises a box body and a module sealed in the box body, wherein the module comprises a battery cell, a lead, a copper-aluminum bar and a BMS (battery management system), a magnetorheological liquid film which can conduct heat and insulate heat and preserve 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 further 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. Because the existing cooling and heating system of the lithium ion battery pack has unsatisfactory heat dissipation and heat preservation effects, high cost and is inconvenient for large-scale mass production, the invention provides the lithium ion battery pack based on magnetorheological fluid and the intelligent temperature control method thereof, wherein the lithium ion battery pack comprises a box body and a module sealed in the box body, a magnetorheological fluid film is arranged between the box body and the module, and the module comprises a battery cell, a lead, 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 sequentially and electrically connected, 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. Wherein, the magnetic current becomes the liquid film and has certain thickness, and the membrane wall material can select plastics or rubber, and the membrane wall is inside to be full of magnetic current becomes liquid, and magnetic current becomes liquid that becomes that magnetic current becomes suspension that magnetic field is one kind and is constituteed with micron size's magnetisable granule dispersion in the mother liquor, and is newton's fluid when there is no magnetic field, and suspension particle becomes ferromagnetic because of magnetic induction under the strong magnetic field effect, and mutual effect becomes the plastomer by liquid in the twinkling of an eye, and its rheological property takes place sharp change, and the theory of operation does: 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 inside the battery pack and positioned between the cell gaps or between the modules and used for sensing the temperature of a monitoring point, in order to achieve a more accurate and ideal effect, a plurality of temperature probes can be arranged at different positions at the same time, 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, when the temperature probes detect that the temperature of the battery pack is too high, the magnetic field generator can increase the magnetic field intensity, so that the heat conductivity coefficient of a magnetorheological liquid film is increased, heat is rapidly dissipated, 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 adjusted by adjusting the strength of the external magnetic field, the magnetic field generator can be generally simplified into an electromagnetic coil and a power supply, and the power supply can be independently arranged and can also be provided by a module. The intelligent temperature control device of lithium ion battery package is formed by adopting the magnetorheological liquid film, the temperature probe, the receiver and the magnetic field generator, the cooling and heating system of the battery package can be combined for use, so that a more ideal effect is achieved, the intelligent temperature control device can also be independently used as a core main control part, heat can be effectively and quickly conducted, heat insulation and heat preservation can be realized, the cost is low, and large-scale mass production is facilitated.
Preferably, the temperature probe is arranged between the cell gaps or between the modules. This scheme sets up the magnetic current becomes liquid film between box and module, the magnetic current becomes liquid film and wraps up the module wholly or partially, temperature probe arranges electric core interstitial space or module in, a real-time temperature for responding to the monitoring point, the temperature that records passes through the data line and transmits the receiver, the receiver passes to magnetic field generator with the signal, and regulate and control magnetic field intensity (the external magnetic field intensity of magnetic current becomes liquid film promptly) with magnetic field generator collaborative work, and then adjust the heat conductivity of magnetic current becomes liquid film, the realization is to the intelligent management and control of battery package internal temperature.
Preferably, the magnetic field generator comprises an electromagnetic coil and a power source 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 and can also be 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-adjustment thermal conductivity of the magnetorheological liquid film is the optimal real-time thermal conductivity. In addition, the magnetic field generator of the scheme is determined according to the specific used magnetorheological liquid film, and 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 is manually controllable or intelligently controllable by software. The magnetic field generator can be manually controlled or intelligently regulated and controlled by software. When the battery pack works in an external environment with a fixed or small fluctuation range, the magnetic field intensity can be manually adjusted to a fixed value; when the battery pack works in a temperature-variable environment, the intensity of the magnetic field 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) 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, so that the intelligent temperature control device of the lithium ion battery pack can effectively and quickly conduct heat and insulate heat, is green and 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, safety performance and consistency of the lithium ion battery are guaranteed.
Drawings
Fig. 1 is a flowchart of an intelligent temperature control method for 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 magnetorheological fluid in an embodiment of the present invention.
FIG. 3 is a schematic view of a partial structure of a magnetorheological liquid film according to an embodiment of the invention.
1. The magnetorheological fluid monitoring device comprises a magnetorheological fluid film 2, a film wall 3, magnetorheological fluid 4, a box body 5, a module 6, a magnetic field generator 7, a temperature probe 8 and a receiver.
Detailed Description
The invention is further described with reference to the following detailed description and accompanying drawings.
As shown in fig. 1, an intelligent temperature control method for a lithium ion battery pack based on magnetorheological fluid comprises the following steps: s1) adding the magnetorheological liquid film 1 between the box body 4 and the module 5; s2) adding a temperature probe 7, a receiver 8 and a magnetic field generator 6 in the battery pack; s3) electrically connecting the temperature probe 7, the receiver 8 and the magnetic field generator 6 in sequence; s4) the temperature probe 7 detects the temperature in the battery pack in real time and transmits the temperature data to the receiver 8; s5) the receiver 8 transmits the temperature data to the magnetic field generator 6, and the magnetic field generator 6 works cooperatively to regulate and control the magnetic field intensity, so that the thermal conductivity of the magnetorheological liquid film 1 is regulated, and the intelligent management and control of the temperature in the battery pack are realized. The invention adds a magneto-rheological liquid film 1, a temperature probe 7, a receiver 8 and a magnetic field generator 6 on the basis of the existing lithium ion battery pack, wherein the magneto-rheological liquid film 1 is arranged between a box body 4 and a module 5 and comprises a film wall 2 and magneto-rheological liquid 3 filled in the film wall 2, and the heat conductivity coefficient of the magneto-rheological liquid 3 can change along with the intensity change of an external magnetic field; the temperature probe 7 is arranged in the battery cell gap in the module 5 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 manually controlled or intelligently controlled through software. The during operation, temperature probe 7 real-time detection battery package's temperature and with temperature data pass to receiver 8, receiver 8 receives after the temperature data with data transfer to magnetic field generator 6, and with magnetic field generator 6 collaborative work, regulate and control the magnetic field intensity that magnetic field generator 6 produced, also be exactly the external magnetic field intensity of magnetic current becomes liquid film 1, and then adjust the coefficient of heat conductivity of magnetic current becomes liquid film 1, make the coefficient of heat conductivity of magnetic current becomes along with the temperature real-time change in the battery package, and be best real-time heat conductivity, finally realize the intelligent management and control to the temperature in the battery package.
As shown in fig. 2, the invention further provides a lithium ion battery pack based on magnetorheological fluid, and the intelligent temperature control method of the lithium ion battery pack based on 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 a battery cell, a lead, 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. During manufacturing, the module 5 is placed in the box body 4, and sealed in a sealing mode by riveting, gluing and the like, so that a finished battery pack is manufactured.
As shown in fig. 3, the magnetorheological liquid film 1 includes a film wall 2 and magnetorheological liquid 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, the wall thickness is 0.1-0.5mm, and the wall thickness is uniform; the magnetic rheological liquid 3 is a special micron magnetic particle-non-magnetic carrier liquid type magnetic rheological liquid, the magnetic particle is carbonyl iron powder with volume fraction of 20-40% and particle diameter of 3-5 μm, and the carrier liquid is a mixed liquid of silicon oil and some mineral oil. Tests show that when the magnetic field intensity is increased within the range of 0-2T, the thermal conductivity coefficient of the magnetorheological fluid 3 is increased from 0.8W/(m.K) to 30W/(m.K), and the thermal conductivity is obviously improved.
As shown in fig. 2, the temperature probe 7 is disposed inside the battery pack, and is located between the cell gaps or between the modules 5, so as to sense the temperature of the monitoring points. For reaching the effect of more accurate ideal, can set up a plurality of temperature probe 7 in different positions simultaneously, temperature probe 7 will detect the temperature data pass to receiver 8, pass to magnetic field generator 6 with the signal after receiver 8 receives again to regulate and control magnetic field intensity with magnetic field generator 6 collaborative work, the magnetic field intensity that controls magnetic field generator 6 production promptly changes along with the temperature in the battery package in real time, and then temperature in the intelligent regulation battery package. 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 dissipated, 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 strength of the external magnetic field, so that the intelligent adjustment and reasonable control of the internal temperature of the lithium ion battery pack are realized. The magnetic field generator 6 can be generally simplified as an electromagnetic coil and a power supply, 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: blow molding the polyimide base film into a bag-shaped structure with fixed shape, thickness and volume, and then injecting the prepared magnetorheological fluid 3 into the bag-shaped structure. The specific amount of the magnetorheological fluid 3 to be injected is adjusted according to actual needs, the magnetorheological fluid 3 is fully injected in the embodiment, and then the sealing is carried out through a thermoplastic process, so that a closed magnetorheological liquid film 1 with the thickness of 5mm is formed.
In order to more directly prove the effectiveness of the invention, the battery pack of the embodiment is powered by 15 degrees, the battery core is made of a square aluminum shell 47Ah 622 high-voltage material, the module 5 is made of 22 strings of 4 parallel combination modes, the embodiment adopts light aluminum alloy with good heat conductivity as a box body 4 material, and the box body 4 material has the characteristics of high strength and low density.
The present embodiment is applied under different temperature scenarios and use conditions.
On the whole, this scheme can effectively compromise practical application under the different temperatures of four seasons, is particularly suitable for using in the big area of difference in temperature round the clock, for example china's Xinjiang desert area, the difference in temperature round the clock is big, and this scheme can let the battery package insulate against heat the heat preservation evening, dispels the heat daytime.
Claims (6)
1. An intelligent temperature control method for a lithium ion battery pack based on magnetorheological fluid is characterized by comprising the following steps:
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: electrically connecting the temperature probe, the receiver and the magnetic field generator in sequence;
s4: the temperature probe detects the temperature in the battery pack in real time and transmits temperature data to the receiver;
s5: the receiver transmits temperature data to the magnetic field generator, and regulates and controls the magnetic field intensity by cooperating with the magnetic field generator, so that the thermal conductivity of the magnetorheological liquid film is regulated, and the intelligent management and control of the temperature in the battery pack are realized.
2. A lithium ion battery pack based on magnetorheological fluid, which adopts the intelligent temperature control method of the lithium ion battery pack based on the magnetorheological fluid according to claim 1, and comprises a box body and a module sealed in the box body, wherein the module comprises an electric core, a lead, a copper-aluminum bar and a BMS (battery management system), and is characterized in that a magnetorheological liquid film which can conduct heat and insulate heat and is arranged between the box body and the module, and the magnetorheological liquid film comprises a film wall and the magnetorheological fluid filled in the film wall; the battery pack further 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.
3. The magnetorheological fluid-based lithium ion battery pack according to claim 2, wherein the temperature probe is arranged between cell gaps or between modules.
4. The magnetorheological fluid-based lithium ion battery pack according to claim 2, wherein the magnetic field generator comprises an electromagnetic coil and a power source, and the power source is electrically connected with the electromagnetic coil.
5. The lithium ion battery pack based on magnetorheological fluid according to claim 2 or 4, wherein the magnetic field generator can be manually controlled or intelligently controlled by software.
6. The lithium ion battery pack based on magnetorheological fluid according to claim 2, wherein the membrane wall material can be plastic or rubber.
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