CN113285146A - Electric vehicle battery heat preservation device and method - Google Patents
Electric vehicle battery heat preservation device and method Download PDFInfo
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- CN113285146A CN113285146A CN202110828394.XA CN202110828394A CN113285146A CN 113285146 A CN113285146 A CN 113285146A CN 202110828394 A CN202110828394 A CN 202110828394A CN 113285146 A CN113285146 A CN 113285146A
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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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- 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
- B60L58/26—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 cooling
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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
- H01M10/613—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
- H01M10/655—Solid structures for heat exchange or heat conduction
- H01M10/6556—Solid parts with flow channel passages or pipes for heat exchange
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
- H01M10/6567—Liquids
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/656—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
- H01M10/657—Means for temperature control structurally associated with the cells by electric or electromagnetic means
- H01M10/6571—Resistive heaters
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/658—Means for temperature control structurally associated with the cells by thermal insulation or shielding
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- 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
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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
- 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
Abstract
The invention provides a battery heat preservation device for an electric vehicle, which comprises a battery box, a battery module, a heat insulation box and a heating tower, wherein a heat conduction chamber is arranged between the heat insulation box and the battery box, the heating tower is connected with the heat conduction chamber through a pipeline, the heat insulation box comprises a plurality of heat insulation plates, each heat insulation plate is hollow to form a closed cavity, a first support body and a second support body are fixedly arranged on the side edge of the closed cavity, an air extraction opening is formed in each heat insulation plate, the closed cavity is extracted air into a vacuum cavity through the air extraction opening, and heat conduction liquid and a heating element are arranged in the heating tower. The battery heat preservation device for the electric automobile provided by the invention utilizes the heat insulation box to preserve heat of the battery module, and the heat conducting liquid heated by the heat conducting piece circularly enters and exits the heat conducting chamber to heat and preserve heat of the battery module.
Description
Technical Field
The invention relates to the technical field of battery energy storage, in particular to a battery heat preservation device and method for an electric vehicle.
Background
With the constant popularization of electric vehicles in life, the use area is also becoming wider and wider. The battery is one of the core components of the electric vehicle as a power source of the electric vehicle, and therefore, the battery directly affects the use performance of the whole vehicle.
Battery box among the electric automobile generally is located the vehicle bottom, be provided with the battery module in the battery box, the heat insulating board is located the battery module under, the realization of battery normal performance need be guaranteed in certain temperature, and current heat insulating board thermal-insulated effect is not good, when external temperature crosses lowly, the battery module is too fast with external heat transfer, the temperature in the battery box can't reach the required temperature of battery, thereby lead to the battery charge-discharge performance not enough, capacity decay, battery life shortens the scheduling problem, also make electric automobile charge time extension, the serious decay of mileage that continues to go, and some other normal performances can not normal use.
Disclosure of Invention
Based on the above, the invention aims to provide a device and a method for preserving heat of an electric vehicle battery, so as to solve the problems that the heat insulation effect of a heat insulation plate is poor in a low-temperature environment, the heat preservation effect of a battery module is poor, and the battery has low activity at a low temperature and generates a plurality of adverse reactions to influence the normal use of the electric vehicle performance in the prior art.
The utility model provides an electric automobile battery heat preservation device, includes the battery box and arranges in battery module in the battery box, still includes hot box and heating tower, hot box with be equipped with the heat conduction room between the battery box, the heating tower pass through the pipeline with the heat conduction room is connected, hot box cover locates the outside of battery box, hot box includes the polylith heat insulating board, every heat insulating board cavity forms an airtight cavity, the lateral wall of airtight cavity has set firmly first supporter and second supporter, the one end of first supporter all with the lateral wall of airtight cavity links firmly, the other end all contradicts with the lateral wall of airtight cavity, the second supporter adopts ceramic matrix composite to make, ceramic matrix composite utilizes the normal position synthesis method to generate in the lateral wall of airtight cavity through inorganic material, set up the intercommunication on the heat insulating board the extraction opening of airtight cavity, the closed cavity is a vacuum cavity through the air exhaust port, heat conducting liquid and heating elements are arranged in the heating tower, and the heat conducting liquid circularly enters and exits the heat conducting chamber through the pipeline.
The invention has the beneficial effects that: weaken battery module and the external heat transfer of low temperature through the heat-insulating box, the heat preservation effect of battery module has been strengthened, when the battery module still receives low temperature to influence, utilize the heating tower to heat conducting liquid wherein, conducting liquid passes through pipeline circulation and circulates around the battery module, heat the heat preservation to the battery module, make the battery module can normal performance, avoid the low temperature to the harmful effects that the battery module caused, also make electric automobile's performance normally realize, simultaneously when the battery module receives high temperature to influence, the not heated conducting liquid circulation is led the hot room and also can be cooled off to the battery module, thereby reduce the influence of high temperature to the battery module, so that improve electric automobile's suitability.
Preferably, the pipeline includes feed liquor pipe and drain pipe, the feed liquor pipe with the drain pipe is close to respectively the upper portion and the bottom of heat-insulating box, be provided with the drawing liquid pump on the feed liquor pipe, the drawing liquid pump is used for extracting heat conduction liquid extremely in the heat conduction room, be provided with in the heating tower and be used for assisting the drawing liquid pump extracts the straw of heat conduction liquid, the straw is the heliciform setting, the one end of straw with the feed liquor union coupling, the other end is close to the bottom of heating tower.
Preferably, a heat conduction pipe is arranged in the heating tower, the heat conduction pipe is connected with the suction pipe in a winding mode, and the heating element is located in the heat conduction pipe.
Preferably, be provided with the honeycomb duct in the heat conduction room, the honeycomb duct be the heliciform around in the outside of battery box, the one end of honeycomb duct with the feed liquor union coupling, the other end with the drain pipe is connected.
Preferably, the electric automobile battery heat preservation device still includes temperature detection mechanism, temperature detection mechanism include the inductor and with the inductor and heating tower electric connection's controller, the inductor install in the battery module, the inductor is used for responding to the temperature of battery module, the controller is used for the basis the temperature control that the inductor detected the start or the stop of heating tower.
Preferably, the electric vehicle battery heat preservation device comprises a charging loop and a discharging loop which are independently arranged, and the charging loop and the discharging loop are respectively and electrically connected with the controller.
Preferably, in order to solve the above technical problem, the present invention provides a charging and temperature keeping method for a battery temperature keeping device of an electric vehicle, including the steps of:
disconnecting the charging loop;
acquiring the current temperature of the battery module to obtain a first temperature signal;
presetting a first preset value of 0 ℃, a second preset value of 25 ℃ and a third preset value of 40 ℃;
comparing the received first temperature signal with each preset value, and if the first temperature signal is smaller than the first preset value, determining that the state is A1; if the first temperature signal is between the first preset value and the second preset value, the state is B1; if the first temperature signal is between the second preset value and the third preset value, the state is C1; if the first temperature signal is greater than the third preset value, the state is D1;
when the battery module is in the state A1, the controller controls the heating tower to continuously work; when the battery module is in a state B1, the charging loop is switched on to charge the battery module; when the battery module is in a state C1, the controller controls the heating tower to stop working; and when the battery module is in a state D1, the charging loop is disconnected, and the charging loop is reconnected after the temperature of the battery module is reduced to the second preset value.
Preferably, if the temperature of the battery module is less than the first preset value, the heating tower is started, and when the first temperature signal is detected to be greater than the first preset value in the heating process, the heating is continued and the charging loop is switched on after 10 minutes of delay setting.
Preferably, in order to solve the above technical problem, the present invention provides a discharge thermal insulation method for a battery thermal insulation device of an electric vehicle, including the steps of:
disconnecting the discharge loop;
acquiring the current temperature of the battery module to obtain a second temperature signal;
presetting a fourth preset value to be 0 ℃, a fifth preset value to be 40 ℃ and a sixth preset value to be 20 ℃;
after receiving the second temperature signal, comparing the second temperature signal with each preset value, and if the second temperature signal is smaller than the fourth preset value, determining that the state is A2; if the second temperature signal is between the fourth preset value and the fifth preset value, the state is B2; when the second temperature signal is greater than the fifth preset value, the state is C2;
when the battery module is in the state A2, the controller controls the heating tower to continuously work; turning on the discharge circuit when the battery module is in a state B2; and when the battery module is in a state C2, closing the heating tower, disconnecting the discharging loop, and reconnecting the discharging loop after the temperature of the battery module is reduced to the sixth preset value.
Preferably, in order to solve the above technical problems, the present invention provides a method for preparing a heat insulation board, comprising the steps of:
the method comprises the following steps that firstly, two same plates are selected as base materials and respectively comprise an upper cover plate and a lower cover plate, first supporting bodies and grooves are respectively etched on the upper cover plate and the lower cover plate, and the first supporting bodies on the two plates are arranged in a staggered mode;
secondly, growing a ceramic matrix composite material at the correspondingly staggered positions of the etched upper cover plate and the etched lower cover plate by using an in-situ synthesis method, and processing to form a second support body;
thirdly, the upper cover plate and the lower cover plate are arranged in a staggered and laminated mode, so that the grooves in the two plate bodies are matched to form a cavity, and the upper cover plate is connected with the lower cover plate through laser welding;
and fourthly, reserving an air extraction opening at the welding position of the two plate bodies, extracting air from the cavity through the air extraction opening to form a vacuum cavity, and sealing the air extraction opening through a welding mode.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a schematic diagram of a battery thermal insulation device for an electric vehicle according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view of a heat shield provided in accordance with an embodiment of the present invention;
FIG. 3 is an exploded view of a heat shield according to an embodiment of the present invention;
FIG. 4 is a schematic view of a pumping port provided in an embodiment of the present invention;
FIG. 5 is a flowchart of a charging and temperature keeping method of a battery temperature keeping device of an electric vehicle according to an embodiment of the present invention;
FIG. 6 is a flowchart of a discharging and heat-preserving method of the electric vehicle battery heat-preserving device according to the embodiment of the present invention;
FIG. 7 is a flow chart illustrating the preparation of a thermal shield according to an embodiment of the present invention.
Description of the main element symbols:
| |
100 | |
| |
| Battery module | ||||
| 200 | |
314 | ||
| |
300 | |
500 | |
| |
400 | |
600 | |
| |
310 | |
410 | |
| |
311 | |
420 | |
| |
312 | |
320 | |
| Connecting pin | 311a | |
330 | |
| |
313 | |
700 | |
| | 313a | Inductor | 210 |
The following detailed description will further illustrate the invention in conjunction with the above-described figures.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Several embodiments of the invention are presented in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1 and 4, a battery thermal insulation device for an electric vehicle according to an embodiment of the present invention includes a battery box 100, a battery module 200, a heat insulation box 300, and a heating tower 400.
Wherein: the battery module 200 is disposed in the battery box 100, the heat insulation box 300 is sleeved outside the battery box 100, the battery box 100 is fixedly connected with the bottom of the heat insulation box 300 by welding, and the heat insulation box 300 and the battery box100, the heat-conducting chamber is arranged between the two heat-insulating boxes, 300 comprises four heat- insulating plates 310, 310 are all plane plates, 310 are all made of Al2O3The material is made, the thickness is 30-50 micrometers, each heat insulation board 310 comprises an upper cover plate 311 and a lower cover plate 312 which are staggered and stacked, one side of the upper cover plate 311 corresponding to one side of the lower cover plate 312 is provided with a groove, the positions of the grooves on the upper cover plate 311 and the lower cover plate 312 correspond to each other, so that the grooves on the upper cover plate 311 and the lower cover plate 312 are matched to form a closed cavity 313, in order to preliminarily connect the upper cover plate 311 and the lower cover plate 312, the upper cover plate 311 is fixedly provided with a connecting pin 311a, the vertical section of the connecting pin 311a is arranged in a trapezoidal shape, the connecting pin 311a is positioned on the contact surface of the upper cover plate 311 and the lower cover plate 312, the lower cover plate 312 is provided with a splicing groove for splicing the connecting pin 311a, the connecting pin 311a is in interference fit with the splicing groove, the connecting pin 311a is matched with the splicing groove, so that the upper cover plate 311 and the lower cover plate 312 can be fastened together, in the embodiment, the grooves are directly formed on the corresponding side walls of the upper cover plate 311 and the lower cover plate 312 by etching, in order to enhance the sealing performance of the sealed cavity 313, a sealing gasket is further fixedly arranged on the side wall of the connecting pin 311a, and the sealing gasket is tightly attached to the wall of the insertion groove. The edge that upper cover plate 311 and lower cover plate 312 contacted is earlier through laser welding, and the point is glued after the welding, then carries out sealing connection again through laser welding, simultaneously, is favorable to strengthening the connection between upper cover plate 311 and the lower cover plate 312 through this cubic sealing mode of laser welding, point and laser welding.
In this embodiment, it should be noted that an air extraction opening 314 is reserved in the process of performing the first welding on the upper cover plate 311 and the lower cover plate 312, the air extraction opening 314 is located at the welding position of the upper cover plate 311 and the lower cover plate 312, the sealed cavity 313 is extracted into a vacuum cavity through the air extraction opening 314, so that the heat preservation of the battery module 200 is realized, the heat insulation effect of the heat insulation box 300 is enhanced, the heat transfer between the battery module 200 and the low-temperature outside is weakened, and it should be noted that the air extraction opening 314 is sealed through welding.
In this embodiment, as shown in fig. 1 and fig. 2, it should be noted that the first support 313a is fixedly disposed on each of the upper cover plate 311 and the lower cover plate 312, the first support 313a is located in the sealed cavity 313, the first support 313a on the upper cover plate 311 abuts against the lower cover plate 312, the first support 313a on the lower cover plate 312 abuts against the upper cover plate 311, so as to support the upper cover plate 311 and the lower cover plate 312, strength of the two plate bodies is enhanced, the first support 313a on any one of the plate bodies is provided with a plurality of first supports 313a, one end of each first support 313a is hemispherical, and it should be noted that the first supports 313a are formed by etching two opposite side walls of the upper cover plate 311 and the lower cover plate 312.
In this embodiment, as shown in fig. 2 and 3, it should be noted that the upper cover plate 311 and the lower cover plate 312 are both provided with the second supporting body 313b, the second supporting body 313b is located in the sealed cavity 313 and does not interfere with the first supporting body 313a, the second supporting body 313b plays a role of increasing strength for both the upper cover plate 311 and the lower cover plate 312, it should be noted that the second supporting body 313b is a porous structure, a space for providing a storage gas is reserved therein, and the stored gas is, for example, air with a low thermal conductivity, so that the second supporting body 313b can also effectively reduce heat transmission, so that the heat insulation effect of the heat insulation plate 310 is better.
In this embodiment, it should be noted that the second support body 313b is formed by processing a ceramic matrix composite produced by an in-situ growth synthesis method, and the ceramic matrix composite improves brittleness of ceramic, thereby ensuring a supporting effect, and being beneficial to ensuring structural strength and stability of the heat insulation box 300, and compared with a copper material, the material has a smaller thermal conductivity, so that the heat insulation effect of the heat insulation box 300 can be effectively enhanced, the heat preservation effect of the battery module 200 is improved, and it should be noted that the second support body 313b is further fixed in a high-temperature welding manner to prevent falling.
In this embodiment, it should be noted that the ceramic matrix composite is prepared by uniformly dispersing the ceramic whisker growth reactants on the upper cover plate 311 and the lower cover plate 312, then directly nucleating and spontaneously growing on the surfaces of the upper cover plate 311 and the lower cover plate 312 by using an in-situ synthesis method to obtain a certain blank, and then processing and densifying under certain conditions, and because the second support body 313b is made of the ceramic matrix composite, the second support body 313b has good compatibility with the upper cover plate 311 and the lower cover plate 312, and the interface bonding strength is also high.
In this embodiment, as shown in fig. 1, it should be noted that the heating tower 400 is connected to the heat conducting chamber through two pipelines, the two pipelines are a liquid inlet pipe 500 and a liquid outlet pipe 600, the liquid inlet pipe 500 is located above the liquid outlet pipe 600, the heating tower 400 is provided with a heat conducting member, a heat conducting liquid and a suction pipe 410, the heat conducting member is composed of a plurality of heating wires and is used for heating the heat conducting liquid, the heat conducting liquid is heat conducting oil, the heat conducting oil is filled in the heating tower 400, the heated heat conducting oil can circularly enter and exit the heat conducting chamber through the liquid inlet pipe 500 and the liquid outlet pipe 600, so as to facilitate heat preservation of the battery module 200, the unheated heat conducting oil can also perform heat dissipation and cooling functions on the battery module 200 by circularly entering and exiting the heat conducting chamber, the suction pipe 410 is spirally arranged, an upper port of the suction pipe 410 is connected to the liquid inlet pipe 500, a lower port is close to the bottom of the heating tower 400, in this embodiment, the liquid inlet pipe 500 is provided with a liquid pump, the drawing liquid pump can draw in conduction oil to the heat conduction room in the heating tower 400, and the heating tower 400 still is provided with heat pipe 420, and the heating member is located heat pipe 420, and heat pipe 420 can protect the heating member, is favorable to separating heat-conducting member and conduction oil, and heat pipe 420 is the heliciform and the winding of straw 410 sets up.
In this embodiment, it should be noted that, the liquid inlet pipe 500 and the liquid outlet pipe 600 are both provided with a control valve for controlling the communication between the heating tower 400 and the heat conducting chamber, the liquid inlet pipe 500 is further provided with a liquid pumping pump for pumping heat conducting oil to flow into the heat conducting chamber along the liquid inlet pipe 500, meanwhile, the heat insulation box 300 is further provided with a pressure release valve 320, one end of the pressure release valve 320 is communicated with the inside of the heat insulation box 300, and the other end of the pressure release valve is communicated with the outside, so as to adjust the pressure in the heat insulation box 300, it should be noted that, because the heat insulation box 300 is sealed, the battery pack in the battery module 200 can generate gas during working or receiving high temperature to increase the pressure in the heat insulation box 300, and therefore, the pressure release valve 320 can exhaust the gas generated by heating the battery module 200, so as to maintain normal pressure in the battery module 200.
In this embodiment, as shown in fig. 1, a flow guide pipe 330 is disposed in the heat insulation box 300, the flow guide pipe 330 spirally surrounds the outside of the battery box 100 and is fixedly connected to the outside of the battery box 100, one end of the flow guide pipe 330 is connected to the liquid inlet pipe 500, the other end is connected to the liquid outlet pipe 600, a heat insulation layer 700 is further fixedly disposed on the outside of the heat insulation box 300, and the heat insulation layer 700 is made of polyurethane foam.
In this embodiment, it should be noted that, the battery heat preservation device further includes a temperature detection mechanism, the temperature detection mechanism includes a sensor 210 for detecting the temperature of the battery module 200 and a controller electrically connected to the sensor 210 and the heating tower 400, the sensor 210 is installed in the battery module 200, the sensor 210 senses the temperature of the battery module 200, when the temperature is too low, the sensor 210 sends a signal to the controller, the controller sends an instruction to control the heating tower 400 to heat, and opens the control valve to allow the liquid pump to pump the heat transfer oil to the flow guide pipe 330, when the temperature of the battery module 200 is too high, the controller can also control the heating tower 400 to stop heating, and simultaneously sends an instruction to open the control valve to allow the liquid pump to pump the unheated heat transfer oil to circularly enter and exit the heat conduction chamber, so as to cool the battery module 200.
In this embodiment, it should be noted that the battery heat preservation device of the electric vehicle further includes a charging loop and a discharging loop that are independently arranged, and the charging loop and the discharging loop are electrically connected to the controller respectively, and it should be noted that, when the temperature of the battery module 200 is too high, the controller can also cut off the charging loop or the discharging loop of the battery, so as to avoid explosion of the battery.
In this embodiment, as shown in fig. 5, it should be noted that the charging and temperature keeping method for the electric vehicle battery temperature keeping device includes the following steps:
disconnecting the charging loop;
collecting the current temperature of the battery module 200 to obtain a first temperature signal;
presetting a first preset value of 0 ℃, a second preset value of 25 ℃ and a third preset value of 40 ℃;
comparing the received first temperature signal with each preset value, and if the first temperature signal is smaller than the first preset value, determining that the state is A1; state B1 if the first temperature signal is between the first predetermined value and the second predetermined value; the state is C1 if the first temperature signal is between the second preset value and the third preset value; if the first temperature signal is greater than the third preset value, the state is D1;
when the battery module 200 is in the state a1, the controller controls the heating tower 400 to continue operating; when the battery module 200 is in the state B1, the charging loop is connected to charge the battery module 200; when the battery module 200 is in the state C1, the controller controls the heating tower 400 to stop operating; when the battery module 200 is in the state D1, the charging circuit is turned off, and the charging circuit is turned on again after the temperature of the battery module 200 drops to the second preset value.
In this embodiment, if the temperature of the battery module 200 is less than the first preset value, the heating tower 400 is started, and when the first temperature signal is detected to be greater than the first preset value in the heating process, the heating is continued and the charging loop is turned on after 10 minutes of delay setting.
In this embodiment, as shown in fig. 6, it should be noted that the method for discharging and insulating the heat preservation device of the electric vehicle battery includes the following steps:
disconnecting the discharge loop;
collecting the current temperature of the battery module 200 to obtain a second temperature signal;
presetting a fourth preset value to be 0 ℃, a fifth preset value to be 40 ℃ and a sixth preset value to be 20 ℃;
comparing the received second temperature signal with each preset value, and if the second temperature signal is smaller than a fourth preset value, determining that the state is A2; if the second temperature signal is between the fourth preset value and the fifth preset value, the state is B2; the state C2 is reached when the second temperature signal is greater than the fifth preset value;
when the battery module 200 is in the state a2, the controller controls the heating tower 400 to continue operating; turning on a discharge circuit when the battery module is in a state B2; when the battery module 200 is in the state C2, the heating tower 400 is turned off and the discharging circuit is turned off, and the discharging circuit is turned back on after the temperature of the battery module 200 drops to the sixth preset value.
In this embodiment, as shown in fig. 7, it should be noted that the preparation method of the heat insulation board 310 includes the following steps:
step S31, selecting two plates with the same material and size as base materials, namely an upper cover plate 311 and a lower cover plate 312, forming a first support body 313a and a groove on the upper cover plate 311 and the lower cover plate 312 respectively through etching, and arranging the first support bodies 313a on the two plates in a staggered manner;
step S32, growing ceramic matrix composite materials on the etched upper cover plate 311 and lower cover plate 312 respectively through an in-situ synthesis method; processing the obtained ceramic matrix composite into a second support body 313 b;
step S33, the upper cover plate 311 and the lower cover plate 312 are placed in a staggered and laminated mode, grooves in the two plate bodies are matched to form a closed cavity 313, and then the edges of the upper cover plate 311, which are in contact with the lower cover plate 312, are connected in a laser welding mode;
in step S34, in the welding process, one suction opening 314 is reserved, the sealed cavity 313 is vacuumized through the suction opening 314, and the suction opening 314 is welded and sealed, so that the sealed cavity 313 is a vacuum cavity.
In this embodiment, in order to ensure the sealing performance, the upper cover plate 311 and the lower cover plate 312 after welding are dispensed again, and then the upper cover plate 311 and the lower cover plate 312 are laser-welded.
In the implementation, the heat insulation box 300 is disposed at the outer side of the battery box 100, so as to weaken the heat transfer between the battery module 200 and the low-temperature outside, and improve the heat insulation effect of the battery module 200. When the battery module 200 is affected by low temperature, the sensor 210 detects the temperature of the battery module 200, and then sends a signal to the controller, the controller sends a command to control the heating tower 400 to start working, control valves of the liquid inlet pipe 500 and the liquid outlet pipe 600 are immediately opened, then heated heat conduction oil circularly flows between the flow guide pipe 330 and the heating tower 400 under the action of the liquid pumping pump, and the battery module 200 is heated and insulated, so that the battery module 200 still has good activity in a low-temperature environment, the battery module 200 can still be charged and discharged normally at low temperature, and other use performances can be normally realized; when the temperature of the battery module 200 is too high, the sensor 210 sends a signal to the controller, the controller sends an instruction to cut off the charging and discharging loop, and sends an instruction to open the control valve to enable the liquid pump to pump unheated heat conduction oil to circularly enter and exit the heat conduction chamber, so that the battery module 200 is cooled, the influence of a high-temperature environment on the battery module 200 is weakened, and the influence of the battery module 200 on the service performance of the electric automobile is avoided.
It should be noted that the above implementation process is only for illustrating the applicability of the present application, but this does not represent that the electric vehicle battery thermal insulation apparatus of the present application has only the above implementation flow, and on the contrary, the electric vehicle battery thermal insulation apparatus of the present application can be incorporated into the feasible embodiments of the present application as long as the electric vehicle battery thermal insulation apparatus of the present application can be implemented.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The utility model provides an electric automobile battery heat preservation device, includes the battery box and arranges the battery module in the battery box in, its characterized in that still includes hot box and heating tower, hot box with be equipped with the heat conduction room between the battery box, the heating tower pass through the pipeline with the heat conduction room is connected, the outside of battery box is located to the hot box cover, hot box includes polylith heat insulating board, every heat insulating board cavity forms an airtight cavity, the lateral wall of airtight cavity has set firmly first supporter and second supporter, the one end of first supporter all with the lateral wall of airtight cavity is linked firmly, the other end all contradicts with the lateral wall of airtight cavity, the second supporter adopts ceramic matrix composite to make, ceramic matrix composite utilizes the normal position synthesis to be in the lateral wall of airtight cavity generates through inorganic material, set up the extraction opening that communicates the airtight cavity on the heat insulating board, the closed cavity is a vacuum cavity through the air exhaust port, heat conducting liquid and heating elements are arranged in the heating tower, and the heat conducting liquid circularly enters and exits the heat conducting chamber through the pipeline.
2. The electric vehicle battery thermal insulation device according to claim 1, wherein the duct includes a liquid inlet pipe and a liquid outlet pipe, the liquid inlet pipe and the liquid outlet pipe are respectively adjacent to the upper portion and the bottom portion of the heat insulation box, the liquid inlet pipe is provided with a liquid pump, the liquid pump is used for pumping the heat conduction liquid into the heat conduction chamber, the heating tower is provided with a suction pipe for assisting the liquid pump to pump the heat conduction liquid, the suction pipe is spirally arranged, one end of the suction pipe is connected with the liquid inlet pipe, and the other end of the suction pipe is adjacent to the bottom portion of the heating tower.
3. The battery thermal insulation device for the electric vehicle as claimed in claim 2, wherein a heat pipe is disposed in the heating tower, the heat pipe is wound around the suction pipe, and the heating member is disposed in the heat pipe.
4. The electric vehicle battery thermal insulation device according to claim 2, wherein a flow guide pipe is disposed in the heat conduction chamber, the flow guide pipe spirally surrounds the outside of the battery box, one end of the flow guide pipe is connected to the liquid inlet pipe, and the other end of the flow guide pipe is connected to the liquid outlet pipe.
5. The electric vehicle battery thermal insulation device according to claim 1, further comprising a temperature detection mechanism, wherein the temperature detection mechanism comprises an inductor and a controller electrically connected to the inductor and the heating tower, the inductor is installed in the battery module, the inductor is used for sensing the temperature of the battery module, and the controller is used for controlling the heating tower to start or stop according to the temperature sensed by the inductor.
6. The electric vehicle battery thermal insulation device according to claim 5, wherein the electric vehicle battery thermal insulation device comprises a charging loop and a discharging loop which are independently arranged, and the charging loop and the discharging loop are respectively electrically connected with the controller.
7. The charging and heat preservation method of the electric vehicle battery heat preservation device according to claim 6, characterized by comprising the following steps:
disconnecting the charging loop;
acquiring the current temperature of the battery module to obtain a first temperature signal;
presetting a first preset value of 0 ℃, a second preset value of 25 ℃ and a third preset value of 40 ℃;
comparing the received first temperature signal with each preset value, and if the first temperature signal is smaller than the first preset value, determining that the state is A1; if the first temperature signal is between the first preset value and the second preset value, the state is B1; if the first temperature signal is between the second preset value and the third preset value, the state is C1; if the first temperature signal is greater than the third preset value, the state is D1;
when the battery module is in the state A1, the controller controls the heating tower to continuously work; when the battery module is in a state B1, the charging loop is switched on to charge the battery module; when the battery module is in a state C1, the controller controls the heating tower to stop working; and when the battery module is in a state D1, the charging loop is disconnected, and the charging loop is reconnected after the temperature of the battery module is reduced to the second preset value.
8. The charging and heat-preserving method of the battery heat-preserving device of the electric automobile according to claim 7, wherein if the temperature of the battery module is lower than the first preset value, the heating tower is started, and when the first temperature signal is detected to be higher than the first preset value in the heating process, the heating is continued and the charging loop is switched on after 10 minutes of delay.
9. The electric vehicle battery heat preservation device discharge heat preservation method based on claim 6 is characterized by comprising the following steps:
disconnecting the discharge loop;
acquiring the current temperature of the battery module to obtain a second temperature signal;
presetting a fourth preset value to be 0 ℃, a fifth preset value to be 40 ℃ and a sixth preset value to be 20 ℃;
after receiving the second temperature signal, comparing the second temperature signal with each preset value, and if the second temperature signal is smaller than the fourth preset value, determining that the state is A2; if the second temperature signal is between the fourth preset value and the fifth preset value, the state is B2; when the second temperature signal is greater than the fifth preset value, the state is C2;
when the battery module is in the state A2, the controller controls the heating tower to continuously work; turning on the discharge circuit when the battery module is in a state B2; and when the battery module is in a state C2, closing the heating tower, disconnecting the discharging loop, and reconnecting the discharging loop after the temperature of the battery module is reduced to the sixth preset value.
10. The battery thermal insulation device for the electric vehicle according to claim 1, wherein the preparation method of the thermal insulation board comprises the following steps:
the method comprises the following steps that firstly, two same plates are selected as base materials and respectively comprise an upper cover plate and a lower cover plate, first supporting bodies and grooves are respectively etched on the upper cover plate and the lower cover plate, and the first supporting bodies on the two plates are arranged in a staggered mode;
secondly, growing a ceramic matrix composite material at the correspondingly staggered positions of the etched upper cover plate and the etched lower cover plate by using an in-situ synthesis method, and processing to form a second support body;
thirdly, the upper cover plate and the lower cover plate are arranged in a staggered and laminated mode, so that the grooves in the two plate bodies are matched to form a cavity, and the upper cover plate is connected with the lower cover plate through laser welding;
and fourthly, reserving an air extraction opening at the welding position of the two plate bodies, extracting air from the cavity through the air extraction opening to form a vacuum cavity, and sealing the air extraction opening through a welding mode.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115951242A (en) * | 2022-12-21 | 2023-04-11 | 国广顺能(上海)能源科技有限公司 | Battery testing method |
| CN116435656A (en) * | 2023-03-17 | 2023-07-14 | 梵智达科技(深圳)有限公司 | Energy storage battery box with efficient heat insulation structure |
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