CN111312954B - Electric vehicle battery thermal management device and thermal management method - Google Patents
Electric vehicle battery thermal management device and thermal management method Download PDFInfo
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- CN111312954B CN111312954B CN202010105179.2A CN202010105179A CN111312954B CN 111312954 B CN111312954 B CN 111312954B CN 202010105179 A CN202010105179 A CN 202010105179A CN 111312954 B CN111312954 B CN 111312954B
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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
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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
- H01M10/635—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
- H01M10/655—Solid structures for heat exchange or heat conduction
- H01M10/6551—Surfaces specially adapted for heat dissipation or radiation, e.g. fins or coatings
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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
- H01M10/6568—Liquids characterised by flow circuits, e.g. loops, located externally to the cells or cell casings
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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
- H01M10/659—Means for temperature control structurally associated with the cells by heat storage or buffering, e.g. heat capacity or liquid-solid phase changes or transition
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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
- H01M50/50—Current conducting connections for cells or batteries
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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
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
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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 relates to the technical field of electric automobiles, in particular to a battery heat management device and a heat management method for an electric automobile, which comprise a box body and a battery pack arranged in the box body, wherein the battery pack comprises a plurality of single batteries which are electrically connected through conducting strips; still including locating inside compound looks variant and the circulating water system of box, compound looks variant intussuseption is filled with phase change material, the unit cell evenly inlays and locates inside compound looks variant, circulating water system includes that the multiunit arranges the cooling tube between adjacent unit cell, the cooling tube evenly inlays and locates inside and multiunit cooling tube intercommunication formation of compound looks variant and can take away the thermal water route of group battery. According to the invention, the phase-change material is filled in the composite phase-change body to obtain better temperature uniformity of the battery pack, and the heat dissipated by the single battery is taken away by the circulating cooling liquid, so that the composite phase-change body has better heat dissipation efficiency, and thus the working safety of the power battery is effectively ensured.
Description
Technical Field
The invention relates to the technical field of electric automobiles, in particular to a battery thermal management device and a battery thermal management method for an electric automobile.
Background
The electric automobile adopts a power battery as power, and electric energy of the power battery is converted into mechanical energy through a controller, a motor and other parts, so that the electric automobile is driven to operate. The existing power battery generally adopts a square lithium battery or a cylindrical lithium battery to form a high-power and high-capacity lithium battery pack in a series connection mode, a parallel connection mode and the like. According to the heat production mechanism of the battery, the battery pack can generate a large amount of heat in the process of large-current charging and discharging, when the heat inside the power battery is unevenly distributed, the service lives of the single batteries are different, so that the capacity and the service life of the power battery are reduced, and even the temperature inside the power battery is sharply increased, so that the thermal runaway is caused. The electric automobile has strict requirements on the safety performance of the lithium-ion power battery, and the lithium-ion power battery is easy to generate thermal runaway under the condition of high multiplying power or high temperature. In order to improve the safety performance of the electric vehicle, a battery thermal management system needs to be arranged to keep the heat generation and the heat dissipation balance of the thermal environment of the internal system of the battery pack. At present, the common heat management modes are an air cooling heat dissipation system, a liquid cooling pipe heat dissipation system and the like, the former has a simple structure but a non-obvious heat dissipation effect and large temperature difference between battery packs, and the latter has high heat dissipation efficiency but a complex structure and uneven temperature of the battery packs.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a battery thermal management device and a thermal management method for an electric vehicle, which can effectively homogenize the temperature of a power battery, dissipate the heat generated by the battery and ensure the running safety of the power battery.
In order to solve the technical problems, the invention adopts the technical scheme that:
the battery pack comprises a plurality of single batteries which are electrically connected through conducting strips; still including locating inside compound looks variant and the circulating water system of box, compound looks variant intussuseption is filled with phase change material, the unit cell evenly inlays and locates inside compound looks variant, circulating water system includes that the multiunit arranges the cooling tube between adjacent unit cell, the cooling tube evenly inlays and locates inside and multiunit cooling tube intercommunication formation of compound looks variant and can take away the thermal water route of group battery.
According to the battery heat management device for the electric automobile, the single batteries are embedded in the composite phase change body, the phase change material is filled in the composite phase change body, and the phase change material has good temperature uniformity and heat storage performance, so that the temperature among the single batteries in the battery pack is uniform; when the overall temperature of the composite phase change body is too high, the circulating water system is started, the cooling liquid is circulated in the water channel, the heat emitted by the single battery is taken away, the heat dissipation efficiency is accelerated, the quick cooling effect is achieved, and the working temperature of the battery is controlled within a reasonable range. The invention can obtain better temperature uniformity of the battery pack and higher heat dissipation efficiency, and can effectively ensure the working safety of the power battery.
Furthermore, the composite phase change body is provided with a plurality of mounting holes for embedding the single batteries, the conducting strips are elastic strips and fixed on two end faces of the composite phase change body, and a plurality of electric connection points electrically contacted with the end parts of the single batteries are formed in a protruding mode of one side of the conducting strips. The conducting strips play a role in fixing the single batteries on one hand and a role in connecting the single batteries on the other hand, and a plurality of groups of single batteries can be connected in series or in parallel through the conducting strips as required to form a battery pack; the conducting strip is set to be the elastic strip, and the electric connection points are arranged, so that effective contact between the conducting strip and the single battery can be guaranteed, and the working stability of the power battery is guaranteed.
Further, circulating water system still includes water tank and water pump, inside water tank and water pump all located the box, the circulation water route is including the end of intaking and the play water end of locating compound phase transition body homonymy, water tank, water pump, the end of intaking, water route, play water end and water tank connect formation circulation water route in order. The cooling liquid is stored in the water tank, and under the action of the water pump, the cooling liquid can circularly take away heat emitted by the single batteries in the circulating water path; the water inlet end and the water outlet end are arranged at the same side of the composite phase change body, so that the assembly of the circulating water system is facilitated.
Furthermore, the end of intaking, play the water end and be the multiunit, multiunit intake end, play water end communicate respectively and form many water routes, and many water routes are all connected between water pump and water tank. The circulating water path comprises a plurality of water paths acting simultaneously, and better heat dissipation efficiency can be obtained.
Furthermore, a disperser is connected between the water pump and the water inlet ends, and a collector is connected between the water outlet ends and the water tank. The water outlet of the water pump divides the cooling liquid into a plurality of strands through the disperser, and the plurality of strands of cooling liquid respectively flow into a plurality of groups of water inlet ends; the cooling liquid flowing out of the water outlet end is collected through a collector, and the collected cooling liquid flows back to the water tank; wherein, the disperser can be arranged in the water pump or outside the water pump.
Furthermore, the radiating pipe is a copper pipe, spiral radiating fins are arranged around the periphery of the copper pipe, and the thickness of the radiating fins is 2 mm-3 mm. When the phase-change material is uniformly heated, the heat radiating fins on the outer wall of the copper pipe take away the heat emitted by the single battery through the heat convection principle.
Furthermore, a heat-conducting graphite layer is arranged at the contact position of the composite phase change body and the single battery. The composite phase variant is contacted with the single battery through the heat conduction graphite layer, so that the composite phase variant is fully contacted with the single battery, the contact thermal resistance is reduced, and the heat transfer efficiency is improved.
Furthermore, a temperature sensor is arranged in the composite phase change body, and the water pump is provided with a controller in signal connection with the temperature sensor and a switch connected with the controller. Monitoring the temperature of the composite phase change body through a temperature sensor, and controlling the opening and closing of the water pump according to the monitored temperature: when the monitored temperature exceeds a set temperature threshold value, controlling a water pump to start, and circularly taking away heat emitted by the single battery by cooling liquid; and when the monitored temperature is lower than the set temperature threshold, the water pump is controlled to be shut down, and energy consumption is saved.
Further, temperature sensor is the multiunit, and multiunit temperature sensor evenly distributed is internal in compound phase change, and multiunit temperature sensor all connects in the input of controller. The data monitored by the multiple groups of temperature sensors can reflect the uniformity of heat distribution, and the opening and closing of the water pump can be controlled by adopting the average value of the temperature values monitored by the multiple groups of temperature sensors and the size of the temperature threshold.
The invention also provides a battery thermal management method for the electric automobile, which comprises the following processes:
the phase change material in the composite phase change body has a heat equalizing effect on heat emitted by the battery monomer, and the temperature difference of the battery monomer is not more than 5 ℃;
monitoring the temperature of the composite phase change body in real time through a temperature sensor, sending a starting signal to a water pump when the temperature of the composite phase change body reaches 50 ℃, starting the water pump, and circulating cooling liquid in a circulating water path to take away heat emitted by the single battery; when the temperature of the composite phase change body is lower than 50 ℃, a shutdown signal is sent to the water pump.
The electric vehicle battery heat management method can obtain better battery pack temperature uniformity and higher heat dissipation efficiency, and can control the working temperature of the battery within a reasonable range, thereby effectively ensuring the working safety of the power battery.
Compared with the prior art, the invention has the beneficial effects that:
according to the battery thermal management device for the electric vehicle, the phase-change material is filled in the composite phase-change body to obtain better temperature uniformity of the battery pack, heat emitted by the single battery is taken away through the circulating cooling liquid, and the battery thermal management device has better heat dissipation efficiency, so that the working safety of the power battery is effectively ensured.
Drawings
FIG. 1 is a schematic structural diagram of a battery thermal management device of an electric vehicle;
FIG. 2 is a schematic structural diagram of a disassembled box of the battery thermal management device of the electric vehicle;
in the drawings: 1, a box body; 2-a single cell; 3, conducting strips; 4-complex phase variants; 5-circulating water system; 51-radiating pipes; 52-a water tank; 53-a water pump; 54-collector; 6-heat sink.
Detailed Description
The present invention will be further described with reference to the following embodiments. Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms may be understood by those skilled in the art according to specific circumstances.
Example one
As shown in fig. 1 to fig. 2, an embodiment of the battery thermal management device for an electric vehicle of the present invention includes a box 1 and a battery pack disposed in the box 1, where the battery pack includes a plurality of single batteries 2, and the plurality of single batteries 2 are electrically connected through a conductive sheet 3; the combined phase change type solar cell module further comprises a combined phase change body 4 and a circulating water system 5, wherein the combined phase change body 4 is arranged inside the box body 1, phase change materials are filled in the combined phase change body 4, the single cells 2 are uniformly embedded inside the combined phase change body 4, the circulating water system 5 comprises a plurality of groups of radiating pipes 51 arranged between the adjacent single cells 2, the radiating pipes 51 are uniformly embedded inside the combined phase change body 4, and the plurality of groups of radiating pipes 51 are communicated to form a water path capable of taking away heat of a battery pack.
In the implementation of the embodiment, the single battery 2 is embedded in the composite phase change body 4, the phase change material is filled in the composite phase change body 4, and the phase change material has good temperature uniformity and heat storage performance, so that the temperature among the single batteries 2 in the battery pack is uniform; when the overall temperature of the composite phase change body 4 is too high, the circulating water system 5 is started, the cooling liquid circulates in the water channel, the heat emitted by the single battery 2 is taken away, the heat dissipation efficiency is accelerated, the quick cooling effect is achieved, and the working temperature of the battery is controlled within a reasonable range.
In one embodiment, the composite phase change body 4 is provided with a plurality of mounting holes for embedding the single batteries 2, the conducting sheet 3 is an elastic sheet, the conducting sheet 3 is fixed on two end faces of the composite phase change body 4, and the conducting sheet 3 protrudes towards one side to form a plurality of electric connection points which are electrically contacted with the end parts of the single batteries 2. The conducting plate 3 plays a role in fixing the single batteries 2 on one hand and a role in connecting the single batteries 2 on the other hand, and in the embodiment, a plurality of groups of single batteries 2 can be connected in series or in parallel through the conducting plate 3 as required to form a battery pack; the conductive plate 3 is preferably arranged as an elastic plate and is provided with an electrical connection point to ensure effective contact between the conductive plate 3 and the single battery 2 to ensure the working stability of the power battery, and is not limited to the above.
In one embodiment, the circulating water system 5 further includes a water tank 52 and a water pump 53, the water tank 52 and the water pump 53 are both disposed inside the box body 1, the circulating water path includes a water inlet end and a water outlet end disposed on the same side of the composite phase body 4, and the water tank 52, the water pump 53, the water inlet end, the water path, the water outlet end and the water tank 52 are sequentially connected to form the circulating water path. In this embodiment, the water inlet end and the water outlet end are both a group, form a waterway and are bent to be arranged in the composite phase body 4, and the cooling liquid circulates in the waterway under the action of the water pump 53 to take away the heat generated by the single battery 2.
In one embodiment, the water inlet end and the water outlet end are provided with a plurality of sets, the water inlet end and the water outlet end of the plurality of sets are respectively communicated to form a plurality of water paths, and the plurality of water paths are all connected between the water pump 53 and the water tank 52. Many water routes parallel arrangement sets up many water routes and can effectively improve heat exchange efficiency. In order to match with multiple water inlet ends and water outlet ends, a disperser is connected between the water pump 53 and the multiple water inlet ends, and a collector 54 is connected between the multiple water outlet ends and the water tank 52. When the cooling device is implemented, the water discharged by the water pump 53 is divided into a plurality of strands by the disperser, and the plurality of strands of cooling liquid respectively flow into the plurality of groups of water inlet ends; the cooling liquid flowing out from the water outlet end is collected by a collector 54, and the collected cooling liquid flows back to the water tank 52; the disperser of the present embodiment may be provided inside the water pump 53, or may be provided outside the water pump 53. In addition, in this embodiment, a valve may be disposed at each outlet of the disperser, and the opening and closing of the valve may be controlled to selectively operate the position of the water path, so as to solve the problem of local temperature non-uniformity in the composite phase change body 4.
In one embodiment, the heat dissipation pipe 51 is a copper pipe, the spiral heat dissipation plate 6 is surrounded by the copper pipe, and the thickness of the heat dissipation plate 6 is 2mm to 3mm. The heat sink 6 on the outer wall of the copper tube takes away the heat emitted from the unit cell 2 by the heat convection principle while the phase change material is uniformly heated, and the shape and thickness of the heat sink 6 are preferably set to obtain a high heat exchange efficiency, but are not limited to the above.
In one embodiment, the contact part of the composite phase change body 4 and the single battery 2 is provided with a heat conducting graphite layer. Therefore, the composite phase change body 4 of the embodiment is in contact with the single battery 2 through the heat conduction graphite layer, so that the composite phase change body 4 is in full contact with the single battery, the contact thermal resistance is reduced, and the heat transfer efficiency is improved.
In one embodiment, a temperature sensor is arranged in the composite phase change body 4, and the water pump 53 is provided with a controller in signal connection with the temperature sensor and a switch connected with the controller. Thus, the temperature of the composite phase change body 4 is monitored by the temperature sensor, and the water pump 53 is controlled to be turned on and off according to the monitored temperature: when the monitored temperature exceeds a set temperature threshold, controlling the water pump 53 to start, and circularly taking away the heat emitted by the single battery 2 by the cooling liquid; and when the monitored temperature is lower than the set temperature threshold, the water pump 53 is controlled to be shut down, so that the energy consumption is saved.
In one embodiment, the temperature sensors are distributed in multiple groups, the temperature sensors are uniformly distributed in the composite phase change body 4, and the temperature sensors are all connected to the input end of the controller. Data monitored by the multiple groups of temperature sensors can reflect the uniformity of heat distribution, and the opening and closing of the water pump 53 can be controlled by adopting the average value of temperature values monitored by the multiple groups of temperature sensors and the size of a temperature threshold; when high temperature appears locally, the water paths at the high temperature are controlled to be opened through the valve, and the water paths at other positions are controlled to be closed, so that heat at the high temperature is quickly taken away until the temperature is uniformly distributed. Compared with the arrangement of a single group of temperature sensors, the heat management device can obtain more accurate temperature monitoring and more uniform heat distribution.
Example two
The embodiment is an embodiment of a thermal management method of a battery thermal management device of an electric vehicle in the first embodiment, and the method comprises the following steps:
the phase change material in the composite phase change body 4 has a heat equalizing effect on heat emitted by the battery monomer, and the temperature difference of the battery monomer is not more than 5 ℃;
monitoring the temperature of the composite phase change body 4 in real time through a temperature sensor, sending a starting signal to the water pump 53 when the temperature of the composite phase change body 4 reaches 50 ℃, starting the water pump 53 and circulating cooling liquid in a circulating water path to take away heat emitted by the single battery 2; when the temperature of the composite phase-change body 4 is below 50 ℃, a shut-down signal is sent to the water pump 53.
Through the process, better temperature uniformity and higher heat dissipation efficiency of the battery pack can be obtained, and the working temperature of the battery can be controlled within a reasonable range, so that the working safety of the power battery is effectively ensured.
In addition, the temperature sensors of the embodiment can be arranged into a plurality of groups, the plurality of groups of temperature sensors are uniformly distributed in the composite phase body 4, and the plurality of groups of temperature sensors are all connected to the input end of the controller; the water route is many, many water routes parallel arrangement to set up the break-make that multiunit valve is used for controlling the water route. Data monitored by the plurality of groups of temperature sensors can reflect the uniformity of heat distribution, and the comparison result of the average value of the temperature values monitored by the plurality of groups of temperature sensors and the temperature threshold value can be used as the control condition for opening and closing the water pump 53; when local high temperature appears, the waterway of accessible valve control high temperature department is opened, and the waterway of other positions department is closed, takes away the heat of high temperature department fast to temperature distribution is even. Compared with the arrangement of a single group of temperature sensors, the heat management device can obtain more accurate temperature monitoring and more uniform heat distribution.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (5)
1. The battery heat management device for the electric automobile comprises a box body (1) and a battery pack arranged in the box body (1), wherein the battery pack comprises a plurality of single batteries (2), and the single batteries (2) are electrically connected through conducting strips (3); the phase change energy-saving battery pack is characterized by further comprising a composite phase change body (4) and a circulating water system (5), wherein the composite phase change body (4) is filled with a phase change material, the single batteries (2) are uniformly embedded in the composite phase change body (4), the circulating water system (5) comprises a plurality of groups of radiating pipes (51) arranged between adjacent single batteries (2), the radiating pipes (51) are uniformly embedded in the composite phase change body (4), and the plurality of groups of radiating pipes (51) are communicated to form a water path capable of taking away heat of the battery pack;
the circulating water system (5) further comprises a water tank (52) and a water pump (53), the water tank (52) and the water pump (53) are both arranged inside the box body (1), a water inlet end and a water outlet end are arranged on the same side of the composite phase body (4), and the water tank (52), the water pump (53), the water inlet end, the water path, the water outlet end and the water tank (52) are sequentially connected to form a circulating water path;
the water inlet ends and the water outlet ends are multiple groups, the multiple groups of water inlet ends and the multiple groups of water outlet ends are respectively communicated to form multiple water paths, the multiple water paths are all connected between the water pump (53) and the water tank (52), a disperser is connected between the water pump (53) and the multiple groups of water inlet ends, a collector (54) is connected between the multiple groups of water outlet ends and the water tank (52), and a valve is arranged at each outlet of the disperser;
be equipped with temperature sensor in compound looks variant (4), water pump (53) are equipped with the controller of being connected with temperature sensor signal and the switch of being connected with the controller, temperature sensor is the multiunit, and multiunit temperature sensor evenly distributed is in compound looks variant (4), and multiunit temperature sensor all connects in the input of controller.
2. The battery thermal management device for the electric vehicle according to claim 1, wherein the composite phase change body (4) is provided with a plurality of mounting holes for embedding the single batteries (2), the conductive sheet (3) is an elastic sheet, the conductive sheet (3) is fixed on two end faces of the composite phase change body (4), and a plurality of electric connection points electrically contacted with the end parts of the single batteries (2) are formed in a protruding manner on one side of the conductive sheet (3).
3. The electric vehicle battery thermal management device according to claim 1, wherein the heat dissipation pipe (51) is a copper pipe, a spiral heat dissipation fin (6) is surrounded on the outer periphery of the copper pipe, and the thickness of the heat dissipation fin (6) is 2mm-3mm.
4. The electric vehicle battery thermal management device according to claim 1, characterized in that the contact part of the composite phase change body (4) and the single battery (2) is provided with a heat-conducting graphite layer.
5. A thermal management method of a battery thermal management device of an electric vehicle based on any one of claims 1 to 4, characterized by comprising the following processes:
the phase change material in the composite phase change body (4) has a heat equalizing effect on heat emitted by the battery monomer, and the temperature difference of the battery monomer is not more than 5 ℃;
the temperature of the composite phase change body (4) is monitored in real time through a temperature sensor, when the temperature of the composite phase change body (4) reaches 50 ℃, a starting signal is sent to a water pump (53), the water pump (53) is started, and cooling liquid is circulated in a circulating water path to take away heat emitted by the single battery (2); when the temperature of the composite phase change body (4) is lower than 50 ℃, a shutdown signal is sent to the water pump (53);
the temperature sensors are arranged into a plurality of groups, the temperature sensors are uniformly distributed in the composite phase change body (4), and the temperature sensors are all connected to the input end of the controller; the water paths are arranged in parallel, and a plurality of groups of valves are arranged to control the on-off of the water paths; the data monitored by the multiple groups of temperature sensors reflect the uniformity of heat distribution, and the comparison result of the average value of the temperature values monitored by the multiple groups of temperature sensors and the temperature threshold is used as the control condition for opening and closing the water pump (53); when high temperature appears locally, the valve controls the water ways at the high temperature to be opened and the water ways at other positions to be closed, so that the heat at the high temperature is quickly taken away until the temperature is uniformly distributed.
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| CN202010105179.2A CN111312954B (en) | 2020-02-20 | 2020-02-20 | Electric vehicle battery thermal management device and thermal management method |
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| CN111883877B (en) * | 2020-08-04 | 2022-06-24 | 广东工业大学 | Electric automobile battery heat management device of collection forced air cooling and liquid cooling |
| CN112072210A (en) * | 2020-09-21 | 2020-12-11 | 杨昊鑫 | Battery based on liquid cooling and phase change material |
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