CN110364785B - Temperature control device for electric vehicle and electric vehicle - Google Patents
Temperature control device for electric vehicle and electric vehicle Download PDFInfo
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- CN110364785B CN110364785B CN201910507680.9A CN201910507680A CN110364785B CN 110364785 B CN110364785 B CN 110364785B CN 201910507680 A CN201910507680 A CN 201910507680A CN 110364785 B CN110364785 B CN 110364785B
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- 238000010438 heat treatment Methods 0.000 claims abstract description 145
- 238000001816 cooling Methods 0.000 claims description 34
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- 238000010168 coupling process Methods 0.000 claims 1
- 238000005859 coupling reaction Methods 0.000 claims 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 10
- 239000000110 cooling liquid Substances 0.000 description 10
- 229910052744 lithium Inorganic materials 0.000 description 10
- 238000010586 diagram Methods 0.000 description 7
- 230000008859 change Effects 0.000 description 5
- 230000009467 reduction Effects 0.000 description 5
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- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- 230000002035 prolonged effect Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00357—Air-conditioning arrangements specially adapted for particular vehicles
- B60H1/00385—Air-conditioning arrangements specially adapted for particular vehicles for vehicles having an electrical drive, e.g. hybrid or fuel cell
- B60H1/00392—Air-conditioning arrangements specially adapted for particular vehicles for vehicles having an electrical drive, e.g. hybrid or fuel cell for electric vehicles having only electric drive means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/02—Heating, cooling or ventilating [HVAC] devices the heat being derived from the propulsion plant
- B60H1/04—Heating, cooling or ventilating [HVAC] devices the heat being derived from the propulsion plant from cooling liquid of the plant
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
- B60L58/27—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries by heating
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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
- H01M10/615—Heating or keeping warm
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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
- H01M10/617—Types of temperature control for achieving uniformity or desired distribution of 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
- H01M10/62—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
-
- 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
- H01M10/637—Control systems characterised by the use of reversible temperature-sensitive devices, e.g. NTC, PTC or bimetal devices; characterised by control of the internal current flowing through the cells, e.g. by switching
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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
- H01M10/6571—Resistive heaters
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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
-
- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Life Sciences & Earth Sciences (AREA)
- Thermal Sciences (AREA)
- Automation & Control Theory (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Electromagnetism (AREA)
- Combustion & Propulsion (AREA)
- Secondary Cells (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention relates to a temperature control device for an electric vehicle and the electric vehicle, belonging to the technical field of batteries and comprising: a battery mounted to the electric vehicle and constituting a power source thereof; the power receiving component is used for connecting an external power supply outside the electric vehicle; the heating components are connected to the battery in parallel and electrically connected with the power-on components, and the battery can be heated by supplying power to the heating components when the power-on components are connected with an external power supply. According to the invention, the battery is heated by the plurality of heating parts connected in parallel, so that high-power heating can be realized, and the battery is rapidly heated to the optimal working condition; the parallel heating parts have the characteristic of small heating power difference, so that the temperature rise consistency of the battery is good and the temperature field of the battery is uniform; when the vehicle is in an ultralow temperature environment, the vehicle is connected with an external power supply through the electric connection component to heat the battery, so that the battery can keep normal operation in the ultralow temperature environment.
Description
Technical Field
The invention belongs to the technical field of batteries, and particularly relates to a temperature control device for an electric vehicle and a vehicle with the temperature control device.
Background
Lithium batteries are widely used in batteries of electric vehicles, but the change of external temperature directly affects the charge and discharge performance of the lithium batteries, and particularly in low-temperature environments, the charge and discharge performance of the lithium batteries is remarkably reduced, and the service life of the lithium batteries is directly affected.
In order to solve the charging and discharging problem of the lithium battery in the low-temperature environment, the heating system for the lithium battery is introduced to heat the lithium battery at the low-temperature state, so that the normal use of the lithium battery at the low-temperature state is ensured. The existing heating systems are provided with the following modes:
firstly, a heating film is arranged below a liquid cooling plate of a lithium battery, the heating film heats cooling liquid, and then the battery is heated by a method of circulating the cooling liquid; the cooling liquid has a large specific heat capacity, and especially in winter in the north, when the temperature is lower than 0 ℃, a large amount of electric energy and time need to be wasted for heating the cooling liquid, which is not beneficial to energy conservation and consumption reduction of the whole vehicle, and leads to poor user experience.
Secondly, for improving heating system's heating area, through with a plurality of heating film series connection and directly attached to battery module surface, because the heating film terminal voltage receives its internal resistance influence change great, lead to the heating power difference of different positions heating film so that the rate of rise of different positions electric core is different, easily lead to the thermal runaway of electric core. And the heating films connected in series have low integral heating power, so that the time consumption for heating the battery to the temperature (20-30 ℃) required by the optimal working condition is long, and the user experience is poor.
And thirdly, the constant current source is connected with the battery pack in series, the heating film is connected with the battery pack in parallel, and the charging and discharging of the battery pack are automatically started and closed according to the voltage change at the two ends of the battery pack and the heating film so as to achieve the effect of improving the temperature rising speed of the battery pack.
However, the heating system generally has the problems of low heating power and slow temperature rise of the battery, and the heating film is attached to the outer side of the battery, so that the battery core is heated by heating the cooling liquid and circulating the cooling liquid, and the whole vehicle is not favorable for energy conservation and consumption reduction.
Disclosure of Invention
In order to solve all or part of the problems, the invention aims to provide a temperature control device for an electric vehicle and the electric vehicle, wherein the battery is heated by a plurality of heating parts connected in parallel, so that high-power heating can be realized, and the battery is rapidly heated to the optimal working condition; the parallel heating parts have the characteristic of small heating power difference, so that the temperature rise consistency of the battery is good and the temperature field of the battery is uniform; when the vehicle is not driven and is in an ultralow temperature environment, the vehicle is connected with an external power supply through the electric connection component to heat the battery, so that the battery can keep normal operation in the ultralow temperature environment.
The invention relates to a temperature control device for an electric vehicle, comprising: a battery mounted to the electric vehicle and constituting a power source thereof; the power receiving component is used for connecting an external power supply outside the electric vehicle; the heating parts are connected with the battery in parallel and electrically connected with the power connection parts, and the battery can be heated by supplying power to the heating parts when the power connection parts are connected with the external power supply.
Further, the heating part is electrically connected with the battery, and when the external power supply is disconnected with the electric connection part, the battery can be heated by supplying power to the heating part through the battery; wherein, still be provided with first switch between battery and the heating part.
The battery pack further comprises a second switch arranged between the heating component and the power-on component and a battery manager for controlling the first switch and the second switch to be switched on or switched off;
the battery manager is also connected with the battery, can detect the temperature of the battery, and controls the second switch to be switched on when the temperature of the battery is lower than a first reference value; and when the battery temperature is lower than a second reference value, controlling the first switch to be switched on and switching the second switch off.
Further, still include with battery liquid cooling mechanism that the heating element links to each other and connect battery liquid cooling mechanism and electric vehicle's car room's heat pump is used for with the heat of heating element passes through battery liquid cooling mechanism and heat pump transmit to electric vehicle's car room.
Furthermore, the battery liquid cooling mechanism comprises a liquid cooling part connected with one side of the heating part, which is far away from the battery, a water pump connected with the liquid cooling part and the battery manager, and a heat exchanger connected with the water pump, the liquid cooling part and the heat pump;
when the battery temperature is within a first reference value interval, the battery manager starts the water pump so that the heat exchanger can transfer heat absorbed by the liquid cooling part from the heating part to a vehicle room through the heat pump.
Further, the battery manager is also connected with the heating component, can detect the temperature of the heating component, and controls the first switch and the second switch to be switched off when the temperature of the heating component is larger than or equal to a third reference value.
Further, the heating part is a heating film or a heating plate; wherein the heating film is a PTC heating film.
Further, the power receiving component is a high voltage connector.
Further, the first switch and the second switch are both relays or MOS tubes.
The invention also provides an electric vehicle which comprises the temperature control device of the electric vehicle.
According to the temperature control device of the electric vehicle, the batteries are heated by the plurality of heating parts connected in parallel, so that high-power heating can be realized, the batteries can be quickly heated to the optimal working condition, the time consumption is short, the use satisfaction of customers is improved, the heating power difference of the heating parts connected in parallel is small, and the batteries at different positions are good in heating consistency and uniform in temperature field. According to the invention, the heating part is arranged between the battery and the liquid cooling part, so that on one hand, the liquid cooling part is prevented from being in direct contact with the battery to absorb the heat of the battery, so that the local temperature of the battery is not uniform, and the use performance of the battery is influenced, on the other hand, the redundant heat of the heating part can be transferred to a vehicle room of an electric vehicle to realize the full utilization of the waste heat, and the energy conservation and emission reduction are facilitated. In the embodiment, the heating power of the heating component is controlled by the battery manager according to the temperature change of the heating component; in addition, when the heating component is a PTC heating film, the function of self temperature control can be realized, external control is not needed, and the heating power of the heating component is reduced in a step-like manner along with the rise of the temperature, so that the problem of thermal runaway caused by too fast temperature rise of the battery is effectively reduced, and the service life of the battery is prolonged.
Drawings
In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
Fig. 1 is a circuit configuration diagram of a temperature control device of an electric vehicle according to an embodiment of the present invention;
fig. 2 is another circuit configuration diagram of a temperature control device of an electric vehicle according to an embodiment of the present invention;
FIG. 3 is a functional block diagram of a temperature control device of an electric vehicle according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a heating circuit of a temperature control device of an electric vehicle according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of another heating circuit of the temperature control device of the electric vehicle according to the embodiment of the present invention;
fig. 6 is a circuit configuration diagram of a temperature control device of an electric vehicle according to still another embodiment of the present invention;
fig. 7 is another functional block diagram of a temperature control device of an electric vehicle according to an embodiment of the present invention.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
Referring to fig. 1, a temperature control device 100 for an electric vehicle of the present invention includes: a power receiving member 10, a battery 20, and a heating member 30, the battery 20 being mounted to the electric vehicle and constituting a power source thereof; a power supply unit 10 for connecting an external power supply other than the battery 20; a plurality of parallel heating members 30 attached to the battery 20 and electrically connected to the electrical connection member 10, capable of providing heat to the battery 20 when the external power supply supplies power to the heating members 30. The electric connection component in the embodiment can be a high-voltage connector which is used for connecting a high-voltage power supply except for an electric vehicle; the number of the heating parts is determined according to the voltage platform of the battery and the resistance of the heating parts, and the number may be 1-10 or more, and is not limited in detail.
This embodiment heats battery 20 through a plurality of parallel connection's heater block, is showing the heating power who has promoted the heater block, thereby does benefit to battery 20's rapid heating up and has shortened battery 20 and heated to best operating mode required time, compares with current series connection's heating membrane technology, and this embodiment parallel connection's heater block has that the power of generating heat difference is little, battery 20 intensifies the uniformity and characteristics such as the temperature field is even, does benefit to battery 20's normal operating. The battery 20 of this embodiment is a lithium battery 20, the heating component is a heating film (such as polyimide, an epoxy plate heating film or a PTC heating film) or a heating plate (such as a silica gel heating plate), and the heating component of this embodiment is preferably a heating film, and can be better attached to the bottom surface of the battery 20, so as to increase the contact area between the heating component and the battery 20, and facilitate effective temperature rise of the battery 20.
The power connection component 10 of the embodiment is a high-voltage connector, and when the vehicle is not running and the battery temperature is lower than a first reference value (for example, 0 ℃), a high-voltage power supply except for the electric vehicle can be connected with the high-voltage connector through a charging gun to supply power to the heating component 30, so that the battery 20 can be continuously heated through an external power supply in a vehicle off state, and the battery 20 is prevented from being frostbitten due to low temperature for a long time.
As shown in fig. 2 and 3, the heating member 30 is also electrically connected to the battery 20, and is capable of heating the battery 20 by supplying power to the heating member by the battery 20 when the external power supply is disconnected from the power receiving member 10; wherein a first switch 40 and a second switch 50 are provided between the battery 20 and the heating part and the electrical part 10, and a battery manager 60 controlling the on or off of the first switch 40 and the second switch 50. The battery manager in this embodiment is a BMS manager capable of sensing the temperature of the battery 20 and controlling the first and second switches 40 and 50 to be turned on and off, and in another embodiment, the temperature of the battery may also be sensed by a temperature sensor.
When the battery manager detects that the temperature of the battery 20 is lower than a first reference value (e.g., 0 ℃) during the non-driving process of the vehicle, the second switch 50 is controlled to be turned on (see fig. 4) (the first switch 40 is in an off state), and the heating component is powered by an external high-voltage power supply connected with the power connection component 10 to heat the battery 20; when the battery manager detects that the temperature of the battery 20 is lower than the second reference value interval (for example, -5 ℃) during the running of the vehicle, the battery manager can control the first switch 40 to be switched on and the second switch 50 to be switched off (see fig. 5), and the battery 20 supplies power to the heating component to heat the battery 20 per se, so that the continuous heating during the running of the electric vehicle is satisfied.
The first switch 40 and the second switch 50 of the present embodiment may be relays, which can control a larger current by a smaller current, and have an automatic switching function. In the embodiment, a relay can be further installed on a circuit where the battery 20 connected with the heating component is located and a circuit where the electric connecting component 10 is located, so that when one relay is adhered, the other relay can normally break a high-voltage loop. The first switch 40 and the second switch 50 of the present embodiment may also be MOS transistors (i.e., field effect transistors).
The temperature control apparatus of this embodiment further includes a battery liquid cooling mechanism 70 (see fig. 6 in detail) connected to the heating member 30 and a heat pump (not shown) connecting the battery liquid cooling mechanism 70 and the vehicle compartment of the electric vehicle, for transferring heat of the heating member 30 to the vehicle compartment of the electric vehicle through the battery liquid cooling mechanism 70 and the heat pump.
Referring to fig. 6, the battery liquid cooling mechanism 70 includes a liquid cooling unit 71 connected to a side of the heating unit away from the battery 20, a water pump 72 connected to the liquid cooling unit 71 and the battery manager, and a heat exchanger 73 connected to the water pump 72, the liquid cooling unit 71 and the heat pump, wherein when the battery temperature is within a first reference value range, the battery manager starts the water pump to enable the heat exchanger 73 to transfer the heat absorbed by the liquid cooling unit 71 from the heating unit to the vehicle compartment through the heat pump.
When the battery manager 60 detects that the temperature of the battery 20 is in a first reference value range (20 ℃ -30 ℃, namely the temperature range of the optimal working condition of the battery operation), the battery manager 60 starts the water pump 72, the cooling liquid starts to flow and absorbs the redundant heat of the heating part in a convection manner so as to be transferred in the cooling liquid, the heat is transferred to the heat exchanger 73 along with the forced flow of the cooling liquid, the refrigerant in the heat exchanger 73 absorbs the part of heat and transfers the part of heat to the heat pump, the heat pump converts the part of absorbed heat into high-level heat energy which can be used by people through electric energy work and then transfers the high-level heat energy to the vehicle cabin, and the heat supply to the vehicle cabin under the low-temperature environment is realized, in the embodiment, the function of the low-temperature heat pump is realized by associating the battery liquid cooling mechanism 70 with the heat pump, the waste heat generated by the heating component is fully utilized, and energy conservation and emission reduction are facilitated. The water pump 72 of this embodiment is a speed-adjustable water pump 72, specifically a dc PWM speed-adjustable water pump 72 having a CAN or LIN communication interface, and is electrically connected to the battery manager 60 through the communication interface.
The liquid cooling part 71 of this embodiment is mostly a cooling plate or a bent cooling tube filled with cooling liquid, and a plurality of parallel heating parts are attached between the outer surface of the battery 20 and the liquid cooling part 71 to prevent the liquid cooling part 71 from directly contacting the battery 20 to absorb heat of the battery 20, so that local temperature unevenness occurs in the battery 20 to affect the use performance of the battery 20; meanwhile, the heating component is directly contacted with the battery, so that the rapid temperature rise of the battery is facilitated, the time for reaching the optimal working condition is shortened, and the user satisfaction is improved.
The battery manager 60 of the present invention is also connected to the heating part 30 (see fig. 7), and is capable of sensing the temperature of the heating part 30 and adjusting the output power of the heating part 30 according to the temperature change of the heating part. During the running process of the vehicle or during non-running, the battery 20 or the external power supply continuously supplies power to the heating part 30, so that the heating part 30 continuously supplies heat to the battery, however, when the temperature of the heating part is too high, the battery 20 is heated too fast, and a thermal runaway problem is caused, therefore, in this embodiment, when the battery manager 60 detects that the temperature of the heating part 30 is greater than or equal to a third reference value (such as 65 ℃, a risk value that the battery is easily subjected to the thermal runaway), the battery manager 60 controls the first switch and the second switch to be off, so as to interrupt the power supply to the heating part, further stop the continuous heating of the heating part to the battery, and realize effective temperature control of the heating part. Similarly, when the battery manager detects that the temperature of the heating part 30 is lower than a second reference value (e.g., -5 ℃), the battery manager 60 restores the original on or off states of the first switch and the second switch (e.g., the first switch is restored to be on if the battery is originally supplying power, and the second switch is restored to be on if the external power supply is originally supplying power), thereby restoring the continuous heat supply of the heating part.
In another embodiment, when the heating element is a PTC heating film (Positive Temperature Coefficient thermistor), the heating element has an overheat protection function, the resistance value of the heating element increases stepwise with the Temperature increase within a certain Temperature range, and particularly when the Temperature reaches a third reference value (e.g., 65 ℃), the resistance value is almost infinite, and since the voltage of the heating element is constant, the current passing through the heating element is extremely small, the heating power of the heating element is almost zero, and the heat supply to the battery is stopped, thereby protecting the battery from thermal runaway caused by too fast Temperature rise. Similarly, along with the gradual reduction of the heating part temperature (for example, the heat of heating part is taken away by battery liquid cooling mechanism or is transferred to the battery) its resistance value can reduce step by step again, and then resumes the heating power of this heating part to can continue to supply heat for the battery, the selection of PTC heating film in this embodiment does benefit to the self control temperature function that realizes the heating film, has the characteristics of simplifying this temperature regulating device structure.
In this embodiment, the self-temperature-control function of the heating component effectively reduces the problem of thermal runaway caused by too fast temperature rise of the battery, and is helpful for prolonging the service life of the battery.
The specific values of the first reference value, the second reference value, the third reference value and the first reference value interval of the embodiment can be manually adjusted according to the actual conditions of the vehicle and the external environment to meet the vehicle use performance requirement, and the specific values are not limited to the values shown above in the embodiment.
The embodiment of the invention also comprises an electric vehicle which comprises the temperature control device 100 of the electric vehicle in any one of the above embodiments.
It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the invention pertains.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (7)
1. An temperature control device for an electric vehicle, comprising:
a battery mounted to the electric vehicle and constituting a power source thereof;
the power receiving component is used for connecting an external power supply outside the battery; the power connection component is a high-voltage connector which can be connected with a high-voltage power supply outside the electric vehicle through a charging gun;
the heating parts are connected with the battery in parallel and electrically connected with the power connection parts, and can heat the battery by supplying power to the heating parts when the power connection parts are connected with the external power supply;
the heating part is also electrically connected with the battery, and when the external power supply is disconnected with the power connection part, the battery can be heated by supplying power to the heating part through the battery; wherein a first switch is also arranged between the battery and the heating part;
the battery comprises a heating component, a power-on component and a battery manager, wherein the heating component is arranged on the battery manager;
the battery manager is also connected with the battery, can detect the temperature of the battery, and controls the second switch to be switched on when the battery temperature is lower than a first reference value, wherein the temperature of the first reference value is 0 degrees; and when the battery temperature is lower than a second reference value, controlling the first switch to be switched on and switching the second switch off, wherein the temperature of the second reference value is-5 degrees.
2. The temperature control device of claim 1, further comprising a battery liquid cooling mechanism coupled to the heating element and a heat pump coupling the battery liquid cooling mechanism to a vehicle compartment of an electric vehicle for transferring heat from the heating element to the vehicle compartment of the electric vehicle via the battery liquid cooling mechanism and the heat pump.
3. The temperature control device of claim 2, wherein the battery liquid cooling mechanism comprises a liquid cooling component connected to a side of the heating component away from the battery, a water pump connected to the liquid cooling component and the battery manager, and a heat exchanger connected to the water pump, the liquid cooling component, and the heat pump;
when the battery temperature is within a first reference value interval, the battery manager starts the water pump so that the heat exchanger can transfer heat absorbed by the liquid cooling part from the heating part to a vehicle room through the heat pump.
4. The temperature control device of claim 1, wherein the battery manager is further connected to the heating component, and is capable of detecting the temperature of the heating component, and controlling the first switch and the second switch to be turned off when the temperature of the heating component is greater than or equal to a third reference value.
5. The temperature control device of claim 1, wherein the heating element is a heating film or plate; wherein the heating film is a PTC heating film.
6. The temperature control device of an electric vehicle according to claim 1, wherein the first switch and the second switch are both relays or MOS transistors.
7. An electric vehicle characterized by comprising the temperature control device of an electric vehicle according to any one of claims 1 to 6.
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