CN116231168A - Power battery box body and power battery heat preservation control method - Google Patents

Power battery box body and power battery heat preservation control method Download PDF

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Publication number
CN116231168A
CN116231168A CN202310518442.4A CN202310518442A CN116231168A CN 116231168 A CN116231168 A CN 116231168A CN 202310518442 A CN202310518442 A CN 202310518442A CN 116231168 A CN116231168 A CN 116231168A
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China
Prior art keywords
heat
temperature value
heat insulation
heat preservation
battery
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Granted
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CN202310518442.4A
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Chinese (zh)
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CN116231168B (en
Inventor
裴小娟
尹芳芳
赵名翰
赵豪儒
谷文博
孟祥宇
陈永胜
王艳
王希凯
宋博涵
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FAW Group Corp
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FAW Group Corp
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Priority to CN202310518442.4A priority Critical patent/CN116231168B/en
Publication of CN116231168A publication Critical patent/CN116231168A/en
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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
    • 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
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/63—Control systems
    • H01M10/633—Control systems characterised by algorithms, flow charts, software details or the like
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/233—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions
    • H01M50/242—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions adapted for protecting batteries against vibrations, collision impact or swelling
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/244—Secondary casings; Racks; Suspension devices; Carrying devices; Holders characterised by their mounting method
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/249—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders specially adapted for aircraft or vehicles, e.g. cars or trains
    • 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 provides a power battery box body and a power battery heat preservation control method. The power battery box includes: the battery box comprises a box body, a battery module and a battery module, wherein the box body is provided with an accommodating space, and the accommodating space is provided with at least one battery module; the heat insulation structure is arranged in the accommodating space, heat insulation materials are filled in the heat insulation structure, and the heat insulation materials are used for exchanging heat with the battery module. By adopting the technical scheme of the invention, the heat insulation structure is arranged in the power battery box body, and the heat insulation material capable of carrying out heat exchange is filled in the heat insulation structure, so that the type of the heat insulation material can be selected according to the condition of the external environment temperature, the purpose of guaranteeing the temperature of the power battery is achieved, the heat insulation material with heat release function is filled in the low-temperature environment in winter, the battery electric quantity and the battery power can be guaranteed to be released to the greatest extent in the ultra-low-temperature environment, the technical problem of serious endurance attenuation of the electric automobile in the low-temperature environment in winter is solved, and the whole electric automobile can be normally used in winter.

Description

Power battery box body and power battery heat preservation control method
Technical Field
The invention relates to the technical field of vehicle battery design, in particular to a power battery box and a power battery heat preservation control method.
Background
Under the low-temperature environment in winter, the electric automobile can be severely attenuated in endurance, and especially the environment temperature is lower than-20 ℃, so that the mileage anxiety of the user is highlighted. At present, a battery thermal management system mainly adopts a liquid cooling mode, an independent liquid cooling plate is designed in the battery, and a cooling system of the whole vehicle is configured, and the battery thermal management system comprises parts such as a cooling liquid tank, a cooling pipeline, a cooling water pump, a radiator, a controller and the like. The scheme can ensure that the battery works in the optimal temperature range under the normal temperature environment, meets the cruising objective of the whole vehicle, and effectively prolongs the service life of the battery. But in winter severe cold temperatures, users complain of being ubiquitous. How to promote the whole vehicle to continue voyage at extremely cold temperature is a technical problem to be solved urgently in the industry.
Aiming at the technical problem that the electric automobile in the winter low-temperature environment has serious endurance attenuation, no effective solution is proposed at present.
Disclosure of Invention
The invention mainly aims to provide a power battery box body and a power battery heat preservation control method, so as to solve the technical problem of serious endurance attenuation of an electric automobile in a low-temperature environment in winter in the prior art.
In order to achieve the above object, according to one aspect of the present invention, there is provided a power battery case comprising: the battery box comprises a box body, a battery module and a battery module, wherein the box body is provided with an accommodating space, and the accommodating space is provided with at least one battery module; the heat insulation structure is arranged in the accommodating space, heat insulation materials are filled in the heat insulation structure, and the heat insulation materials are used for exchanging heat with the battery module.
Further, the insulation structure includes: the heat preservation box body is arranged at the bottom of the accommodating space, a plurality of heat exchange cavities are formed in the heat preservation box body and are communicated with each other, and heat preservation materials are filled in the heat exchange cavities.
Further, the heat insulation box body is of a plate-shaped structure, and the heat exchange cavity extends along the horizontal direction of the heat insulation box body.
Further, at least one material filling port is formed in the heat preservation box body and communicated with the at least one heat exchange cavity, and is used for filling heat preservation materials into the heat exchange cavity and/or extracting the heat preservation materials from the heat exchange cavity.
Further, a liquid level sensor is arranged at the material filling port and is used for detecting the filling quantity of the heat insulation material in the heat exchange cavity.
Further, an automatic locking mechanism is arranged at the material filling opening, and the automatic locking mechanism is provided with a locking position for blocking the material filling opening and an opening position for opening the material filling opening.
Further, the heat insulation box body is also provided with an air pressure balance valve, the air pressure balance valve is communicated with the heat exchange cavity, the air pressure balance valve is provided with an opening state and a closing state, when the closed air pressure P1 in the heat insulation box body is equal to the external air pressure P0, the air pressure balance valve is in the closing state, and when the closed air pressure P1 in the heat insulation box body is unequal to the external air pressure P0, the air pressure balance valve is in the opening state.
Further, the thermal insulation material comprises a first phase change material for releasing heat energy, the first phase change material having a first critical temperature, wherein the first critical temperature is less than or equal to-36 ℃ and less than or equal to-35 ℃.
Further, the thermal insulation material comprises a second phase change material, the second phase change material is used for absorbing heat energy, and the second phase change material has a second critical temperature, wherein the second critical temperature is more than or equal to 39 ℃ and less than or equal to 40 ℃.
Further, the power battery box body further includes: and the external protection structure is arranged outside the box body and is made of damping materials.
Further, the outer protective structure is a PVC coating.
Further, a box mounting mechanism is arranged on the side wall of at least one of the box bodies, and the power battery box body is connected with the vehicle body through the box mounting mechanism.
According to another aspect of the present invention, there is provided a power battery thermal insulation control method, which performs thermal insulation control using the above power battery box, the method comprising: detecting the working state of the whole vehicle, the working state of a battery system, a temperature value T1 of the environment of the whole vehicle, a temperature value T2 of the lowest battery, a current battery temperature difference delta T, a remaining range R1, a user expected range R2, a closed air pressure P1 in an insulation box body and an external air pressure P0, wherein the current battery temperature difference delta T is the difference value between the temperature value T1 of the environment of the whole vehicle and the temperature value T2 of the lowest battery; under the condition that the working state of the whole vehicle and the working state of the battery system are normal, the closed air pressure P1 is equal to the external air pressure P0, and the current battery temperature difference delta T is in a normal temperature difference range, determining a heat preservation requirement based on the whole vehicle environment temperature value T1, wherein the heat preservation requirement at least comprises a load heat preservation function requirement and an unload heat preservation function requirement; under the condition that the remaining endurance mileage R1 is smaller than the expected endurance mileage R2 of the user, obtaining user demand information, wherein the user demand information at least comprises one of the following steps: a vehicle start demand and a vehicle travel demand; based on user demand information, a whole vehicle environment temperature value T1 and heat preservation demands, heat preservation material information is generated, and the heat preservation material information at least comprises one of the following: the type of the heat-insulating material, the filling amount of the heat-insulating material and the extraction amount of the heat-insulating material; based on the insulation material information, a control instruction set is generated, the control instruction set is used for controlling the filling machine to fill the insulation material into the insulation structure, and the control instruction set is used for controlling the filling machine to draw out the insulation material from the insulation structure.
Further, determining the thermal insulation requirement based on the whole vehicle ambient temperature value T1 includes: determining the heat preservation requirement as a load heat preservation function requirement under the condition that the whole vehicle environment temperature value T1 is larger than a preset environment high temperature value or the whole vehicle environment temperature value T1 is smaller than a preset environment low temperature value; and determining the heat preservation requirement as the unloading heat preservation function requirement under the condition that the whole vehicle environment temperature value T1 is smaller than the preset environment high temperature value and the whole vehicle environment temperature value T1 is larger than the preset environment low temperature value.
Further, the method further comprises: under the condition that the whole vehicle environment temperature value T1 is smaller than a preset environment low temperature value, the heat insulation material is a first phase change material, the first phase change material has a first critical temperature, and the first phase change material releases heat energy under the condition that the whole vehicle environment temperature value T1 is smaller than or equal to the first critical temperature; under the condition that the whole vehicle environment temperature value T1 is larger than a preset environment high temperature value, the heat insulation material is a second phase change material, the second phase change material has a second critical temperature, and the second phase change material absorbs heat energy under the condition that the whole vehicle environment temperature value T1 is larger than or equal to the second critical temperature.
By adopting the technical scheme of the invention, the heat insulation structure is arranged in the power battery box body, and the heat insulation material capable of carrying out heat exchange is filled in the heat insulation structure, so that the type of the heat insulation material can be selected according to the condition of the external environment temperature, the purpose of guaranteeing the temperature of the power battery is achieved, the heat insulation material with heat release function is filled in the low-temperature environment in winter, the battery electric quantity and the battery power can be guaranteed to be released to the greatest extent in the ultra-low-temperature environment, the technical problem of serious endurance attenuation of the electric automobile in the low-temperature environment in winter is solved, and the whole electric automobile can be normally used in winter. Meanwhile, the heat insulation structure can reduce the temperature difference between battery monomers in the power battery box body, improve the consistency of the temperature of the power battery system and prolong the service life of the battery.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
fig. 1 shows a schematic structural view of an embodiment of a power cell housing according to the present invention;
FIG. 2 shows a schematic flow chart of a first embodiment of a power cell thermal insulation control method according to the present invention;
fig. 3 shows a hardware block diagram of an electronic device of a vehicle according to the present invention;
FIG. 4 shows a schematic flow chart of a second embodiment of a power cell thermal insulation control method according to the present invention;
FIG. 5 shows a schematic flow chart of a third embodiment of a power cell thermal insulation control method according to the present invention;
fig. 6 shows a flow chart of a fourth embodiment of a power battery thermal insulation control method according to the present invention.
Wherein the above figures include the following reference numerals:
11. a battery module;
21. a thermal insulation structure; 211. a thermal insulation box body; 213. a heat exchange cavity; 214. a material filling port; 215. an air pressure balance valve; 216. an outer protective structure;
31. a case body;
41. and a box body mounting mechanism.
Detailed Description
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Exemplary embodiments according to the present application will now be described in more detail with reference to the accompanying drawings. These exemplary embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. It should be understood that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of these exemplary embodiments to those skilled in the art, that in the drawings, it is possible to enlarge the thicknesses of layers and regions for clarity, and that identical reference numerals are used to designate identical devices, and thus descriptions thereof will be omitted.
As shown in fig. 1, according to an embodiment of the present application, a power battery case is provided.
Specifically, the power battery box body comprises a box body 31 and a heat insulation structure 21, wherein the box body 31 is provided with an accommodating space, and the accommodating space is provided with at least one battery module 11; the heat insulation structure 21 is arranged in the accommodating space, and heat insulation materials are filled in the heat insulation structure 21 and used for exchanging heat with the battery module 11.
By adopting the technical scheme of the embodiment, the heat insulation structure 21 is arranged in the power battery box body, and the heat insulation structure 21 is filled with the heat insulation material capable of carrying out heat exchange, so that the type of the heat insulation material can be selected according to the condition of the external environment temperature, the purpose of guaranteeing the temperature of the power battery is achieved, the heat insulation material with the heat release function is filled in the low-temperature environment in winter, the battery electric quantity and the battery power can be guaranteed to be released to the greatest extent in the ultra-low-temperature environment, the technical problem that the electric automobile in the low-temperature environment in winter is seriously attenuated in endurance is solved, and the whole electric automobile is normally used in winter. Meanwhile, the heat insulation structure can reduce the temperature difference between battery monomers in the power battery box body, improve the consistency of the temperature of the power battery system and prolong the service life of the battery.
In an exemplary embodiment of the present application, the power battery case further includes a bottom plate structure disposed at the bottom outside of the case body 31 to assist the case body 31 in carrying the weight of the battery module 11.
It should be noted that, the heat insulation structure 21 may be provided in various manners, for example, the heat insulation structure 21 may be provided as an annular cavity structure, the annular cavity structure is filled with heat insulation material, and the battery module 11 is located in an annular space of the annular cavity structure. The heat insulation structure 21 may be a box structure, and a plurality of battery mounting positions are arranged in the box structure, the battery mounting positions are used for placing the battery module 11, a plurality of flow channels in different directions are arranged in the box structure, and heat insulation materials are filled in the flow channels so as to exchange heat with a plurality of surfaces of the battery module 11.
The heat insulation material adopts a phase change material which can be filled and evacuated, and the phase change material can be recycled for a plurality of times. The phase change material can be selected according to the actual environment temperature and the heat preservation requirement, and the low-temperature performance and the endurance mileage of the electric vehicle can be obviously improved.
Specifically, the heat insulation structure 21 comprises a heat insulation box body 211, the heat insulation box body 211 is arranged at the bottom of the accommodating space, a plurality of heat exchange cavities 213 are formed in the heat insulation box body 211, the heat exchange cavities 213 are communicated with one another, and heat insulation materials are filled in the heat exchange cavities 213. The heat exchange cavities 213 are communicated with each other, so that the fluidity of the heat insulation material can be enhanced, for example, when the heat insulation material is liquid, the heat insulation material can flow in the heat exchange cavities 213 only by introducing the heat insulation material from the inlet of one heat exchange cavity 213.
It should be noted that, the heat exchange cavity 213 has various arrangement modes, for example, the plurality of heat exchange cavities 213 may extend along the horizontal direction of the heat insulation box 211 and extend along the vertical direction of the heat insulation box 211, so as to perform heat exchange and heat insulation on the battery module 11 from multiple directions.
Preferably, the heat insulation box 211 has a plate structure, and the heat exchange cavity 213 extends along the horizontal direction of the heat insulation box 211.
As shown in fig. 1, the heat insulation box 211 has a plate-shaped structure, and the heat insulation box 211 is disposed at the bottom of the accommodating space, so that the upper surface of the heat insulation box 211 contacts with the bottom surface of the battery module 11, thereby realizing large-area heat exchange. The heat exchange cavity 213 extends along the horizontal direction of the heat insulation box 211, so that the heat insulation material circulates along the horizontal direction and exchanges heat, and the heat exchange area is increased, and it should be noted that, the horizontal direction here refers to any direction on the horizontal section of the heat insulation box 211, for example, the heat exchange cavity 213 may extend along the length direction, the width direction, the diagonal direction, and the like of the heat insulation box 211.
Specifically, when the plurality of heat exchange chambers 213 are disposed to extend in the horizontal direction of the heat insulation box 211, the plurality of heat exchange chambers 213 that are mutually communicated may have various structures, such as an annular structure, a cross-shaped structure, a zigzag structure, a wave-shaped structure, etc.
Wherein, insulation can 211 accessible negative pressure evacuation adds annotates insulation material, and the high of insulation can 211 can be adjusted according to the size of box body 31, in this application's an exemplary embodiment, the high of insulation can 211 is between 8mm ~30mm, sets up suitable height, can promote the heat storage energy and the phase transition time of phase transition process.
Further, at least one material filling port 214 is formed in the heat insulation box 211, the material filling port 214 is communicated with the at least one heat exchange cavity 213, the material filling port 214 is used for filling heat insulation material into the heat exchange cavity 213, and/or the material filling port 214 is used for extracting heat insulation material from the heat exchange cavity 213.
Preferably, in one exemplary embodiment of the present application, the material filling port 214 communicates with one of the heat exchange chambers 213, and the material filling port 214 serves as both a filling inlet and a withdrawal port for the insulation material, which reduces the structural openings, reduces the risk of leakage of material, and facilitates the filling and withdrawal of subsequent insulation material. Alternatively, two material filling ports 214 may be provided so that one serves as a filling inlet and the other serves as a withdrawal outlet.
Through setting up material filling port 214, can pack heat preservation material to heat transfer cavity 213 intussuseption according to actual need to realize power battery's heat preservation function, avoid outside extremely cold environment or outside extremely hot environment power battery temperature anomaly down, also can take out heat preservation material when outside ambient temperature is normal, alleviate vehicle weight, promote driving experience.
Correspondingly, the box body 31 is provided with a corresponding avoiding opening, and the avoiding opening is arranged corresponding to the material filling opening 214, so that the whole power battery box body does not need to be disassembled when filling materials and extracting materials, and the operation process is simplified. Preferably, the avoiding opening is formed on the side wall of the box body 31, and the material filling opening 214 is formed on the side wall of the insulation box 211.
Wherein, the material filling port 214 is provided with a liquid level sensor, and the liquid level sensor is used for detecting the filling amount of the heat insulation material in the heat exchange cavity 213. By arranging the liquid level sensor, the filling amount of the heat insulation material in the heat exchange cavity 213 can be detected in real time, the excessive filling or excessive extraction is avoided, the accurate control of the filling amount of the heat insulation material is realized, the liquid level sensor can be connected with an ECU (electronic control unit) of a vehicle, an instrument panel or a display of the vehicle and the like for data transmission, and the instrument panel can display the filling amount of the heat insulation material, the current opening and closing state of the material filling opening 214, whether the filling is finished or not and other information in real time.
Further, an automatic locking mechanism is provided at the material filling port 214, and has a locking position for blocking the material filling port 214 and an opening position for opening the material filling port 214. The automatic locking mechanism can realize automatic plugging and automatic opening of the material filling port 214, so that convenience of a thermal insulation material filling process is improved, the problem that the material filling port 214 is forgotten to be manually closed during manual operation is avoided, and the thermal insulation structure 21 is protected.
In one exemplary embodiment of the present application, when the nozzle of the dispenser is inserted into the material fill port 214, the automatic locking mechanism may be triggered to open the closure of the material fill port 214; when the filling nozzle of the filling machine pulls out the material filling opening 214, the automatic locking mechanism can be triggered again, and the sealing cover of the material filling opening 214 is closed, so that the sealing and protecting functions are realized.
Further, the heat insulation box 211 is further provided with an air pressure balance valve 215, the air pressure balance valve 215 is communicated with the heat exchange cavity 213, the air pressure balance valve 215 has an open state and a closed state, when the closed air pressure P1 in the heat insulation box 211 is equal to the external air pressure P0, the air pressure balance valve 215 is in the closed state, and when the closed air pressure P1 in the heat insulation box 211 is unequal to the external air pressure P0, the air pressure balance valve 215 is in the open state. By arranging the air pressure balance valve 215, the case deformation caused by unbalanced air pressure difference between the inside and the outside of the cavity in the phase change process can be avoided, and the reliability and the safety of the power battery system are ensured.
As shown in fig. 1, the case body 31 is provided with a valve extension port from which the air pressure balance valve 215 extends, and the air pressure balance valve 215 and the material filling port 214 are provided on different sides of the thermal insulation case 211 to avoid mutual interference.
Preferably, the air pressure balance valve 215 is connected with an automatic locking mechanism, an instrument panel of the vehicle, a display and the like, so as to close the material filling port 214 in time when the closed air pressure P1 in the heat insulation box 211 is detected to be different from the external air pressure P0, and send prompt information to a user.
The heat insulation material comprises a first phase change material, the first phase change material is used for releasing heat energy, and the first phase change material has a first critical temperature, wherein the first critical temperature is less than or equal to-36 ℃ and less than or equal to-35 ℃. The first phase change material is mainly used in an ultralow temperature environment in winter, when the temperature of the external environment reaches a first critical temperature, the first phase change material is subjected to phase change and is exchanged with external energy, and as the phase change material has higher phase change enthalpy, a large amount of heat energy can be released in the phase change process, and the phase change process is longer, the temperature of a battery monomer arranged in the insulation box body can be prevented from being changed drastically, the battery electric quantity is ensured to be released to the maximum extent in the low temperature environment, and the problem of rapid reduction of the endurance mileage of the electric vehicle caused by sudden temperature drop in cold seasons is solved.
In one exemplary embodiment of the present application, the first phase change material comprises a main energy storage agent, water, a nucleating agent, a thickener, and an auxiliary energy storage agent, wherein the mass percentages are as follows: 7% of a main energy storage agent, 69% of water, 4% of a nucleating agent, 5% of a thickening agent and 15% of an auxiliary energy storage agent; the main energy storage agent is ammonium chloride, and the auxiliary energy storage agent is at least one of calcium chloride, sodium chloride, magnesium chloride, potassium chloride, barium chloride, sodium nitrate, sodium acetate, glycerol, potassium carbonate, ammonium nitrate, magnesium sulfate and lithium chloride; the low-temperature phase-change material has the advantages of good stability, low material cost, simple preparation process, high phase-change latent heat which can reach 230J/g, ultra-long cycle times, test after 500 cycles, and phase-change latent heat attenuation less than 1.8 percent.
The heat insulation material comprises a second phase change material, the second phase change material is used for absorbing heat energy, and the second phase change material has a second critical temperature, wherein the second critical temperature is more than or equal to 39 ℃ and less than or equal to 40 ℃. The second phase change material is mainly used in an ultra-high temperature environment in summer, when the temperature of the external environment reaches a second critical temperature, the second phase change material is subjected to phase change and is exchanged with external energy, and as the phase change material has higher phase change enthalpy, a great amount of heat energy can be absorbed in the phase change process, and the phase change process is longer, the temperature of a battery monomer arranged in the heat preservation box body can be prevented from being changed drastically, the battery electric quantity is ensured to be released to the maximum degree in the high temperature environment, the problem that the power of an electric vehicle is limited due to the extremely hot temperature in the ultra-high temperature season is solved, and the power performance of the whole vehicle is improved.
In an exemplary embodiment of the present application, the second phase change material is formed by uniformly mixing a microcapsule having an average diameter of 20 microns and copper oxide aerogel having a porosity of 90% in a mass ratio of 50:1.
Further, the power battery case further includes an outer protection structure 216, the outer protection structure 216 is disposed outside the case body 31, and the outer protection structure 216 is made of a shock absorbing material. Through setting up outside protective structure 216, can realize the outside protection to box body 31, prevent that the whole car NVH performance that road surface rubble from striking leads to reduces the problem.
Specifically, the outer protective structure 216 is a PVC coating. The PVC coating mode is more convenient, and the subsequent maintenance is more convenient.
Further, a case mounting mechanism 41 is provided on a side wall of at least one of the case bodies 31, and the power battery case is connected to the vehicle body through the case mounting mechanism 41.
Specifically, in one exemplary embodiment of the present application, a plate-like structure protruding from the outer peripheral surface of the case body 31 is provided, and the case mounting mechanism 41 is a connection hole provided in the plate-like structure, through which the power battery case is connected to the vehicle body.
In the power battery box body in the embodiment, the heat insulation structure 21 is arranged in the power battery box body, heat insulation materials capable of carrying out heat exchange are filled in the heat insulation structure 21, and the heat insulation materials can be materials with heat release capacity and materials with heat absorption capacity, so that the heat insulation structure 21 integrates the traditional heat insulation function and cooling function of the battery box body, a cooling unit and a pipeline are not required to be additionally configured in a vehicle, the reduction of parts of the whole vehicle and the simplification of a control system are realized, the overall reliability of the box body is improved, and the arrangement space of the whole vehicle is saved. Under the environment of non-extremely cold and non-extremely hot air temperature, the heat insulation structure 21 can be not applied (i.e. the heat insulation structure 21 is not filled with heat insulation materials), the functions and the performances of the whole vehicle can not be influenced, and the cost of the whole vehicle can not be additionally increased.
According to another embodiment of the present application, a power battery insulation control method is provided, and the power battery insulation control method uses the power battery box body to perform insulation control, as shown in fig. 2, and the method includes:
step S21, detecting the working state of the whole vehicle, the working state of a battery system, the temperature value T1 of the environment of the whole vehicle, the lowest temperature value T2 of the battery, the current battery temperature difference value delta T, the remaining range R1, the user expected range R2, the closed air pressure P1 in the heat preservation box 211 and the external air pressure P0, wherein the current battery temperature difference value delta T is the difference value between the temperature value T1 of the environment of the whole vehicle and the lowest temperature value T2 of the battery;
specifically, the working state of the whole vehicle can be judged according to whether the whole vehicle instrument displays an alarm state, the working state of the battery system is judged through the self-check of the battery system, the environment temperature of the whole vehicle can be acquired by a temperature sensor arranged in the whole vehicle, the lowest temperature value T2 of the battery is acquired according to a single battery temperature sensor arranged in a power battery box body, preferably, the acquired environment temperature value T1 of the whole vehicle and the lowest temperature value T2 of the battery are subjected to signal validity judgment through a battery management controller in a battery pack, the current battery temperature difference delta T is obtained through mathematical operation, the check frequency for carrying out signal validity judgment can be designed based on the signal sampling frequency, and if the check result shows that a sampling signal is an invalid value, the whole vehicle instrument displays an alarm information prompt.
Step S22, under the condition that the working state of the whole vehicle and the working state of the battery system are normal, the closed air pressure P1 is equal to the external air pressure P0, and the current battery temperature difference delta T is in a normal temperature difference range, determining a heat preservation requirement based on the whole vehicle environment temperature value T1, wherein the heat preservation requirement at least comprises a load heat preservation function requirement and an unload heat preservation function requirement;
specifically, in step S22, whether the battery minimum temperature value T2 is higher than the minimum temperature threshold may be further added as a determination condition, that is, when the current battery temperature difference Δt is within the normal temperature difference range and the battery minimum temperature value T2 is higher than the minimum temperature threshold, it is determined that the battery system is normal, and the determination of the heat preservation requirement is entered. When any one of the current battery temperature difference value delta T and the battery minimum temperature value T2 does not meet the conditions, the battery system is abnormal, the vehicle instrument displays alarm information, the vehicle cannot normally run, and no subsequent flow is carried out.
Step S23, under the condition that the remaining range R1 is smaller than the expected range R2 of the user, obtaining user demand information, wherein the user demand information at least comprises one of the following steps: a vehicle start demand and a vehicle travel demand;
in step S23, when it is determined that the remaining range R1 is smaller than the expected range R2 of the user, the vehicle instrument may display an information word such as "loadable heat preservation" to remind the user to input user demand information, where the user demand information is manually generated by the user, for example, the user may generate the user demand information by interacting with a display screen, or inputting by voice, or the like.
Step S24, based on the user demand information, the whole vehicle environment temperature value T1 and the heat preservation demand, generating heat preservation material information, wherein the heat preservation material information at least comprises one of the following components: the type of the heat-insulating material, the filling amount of the heat-insulating material and the extraction amount of the heat-insulating material;
step S25, based on the insulation material information, a control instruction set is generated, where the control instruction set is used to control the filling machine to fill the insulation structure 21 with the insulation material, and the control instruction set is used to control the filling machine to draw out the insulation material from the insulation structure 21.
Preferably, in step S25, the vehicle may cause the whole vehicle instrument to display the filling state in the whole course of the process of filling the thermal insulation material and extracting the thermal insulation material.
Through step S21-step S25, under the condition that the whole vehicle is in a normal state, the heat preservation requirement and the user requirement information are determined, and the type of the heat preservation material, the filling quantity of the heat preservation material and the extraction quantity of the heat preservation material are determined based on the user requirement information, the whole vehicle environment temperature value T1 and the heat preservation requirement, so that the heat preservation material can adapt to various environment conditions and user requirements, and the user experience is improved.
In an exemplary embodiment of the present application, as shown in fig. 4, after filling is completed (i.e. filling is completed) or after evacuation is completed, the enclosed air pressure P1 and the external air pressure P0 in the insulation box 211 are detected again, if the values are equal, whether the whole vehicle instrument displays an alarm is further determined, and when the whole vehicle instrument does not display an alarm, the insulation process is performed.
Further, in step S22, determining the thermal insulation requirement based on the vehicle ambient temperature value T1 includes:
determining the heat preservation requirement as a load heat preservation function requirement under the condition that the whole vehicle environment temperature value T1 is larger than a preset environment high temperature value or the whole vehicle environment temperature value T1 is smaller than a preset environment low temperature value;
as shown in fig. 5, it should be understood that when the thermal insulation requirement is a load thermal insulation function requirement, the generated thermal insulation information should include the type of thermal insulation material and the filling amount of the thermal insulation material, and a certain amount of thermal insulation material needs to be filled into the thermal insulation structure 21.
And determining the heat preservation requirement as the unloading heat preservation function requirement under the condition that the whole vehicle environment temperature value T1 is smaller than the preset environment high temperature value and the whole vehicle environment temperature value T1 is larger than the preset environment low temperature value.
As shown in fig. 5, it should be understood that when the thermal insulation requirement is an unloading thermal insulation function requirement, the generated thermal insulation information should include the extracted amount of thermal insulation, and generally, the extracted amount of thermal insulation is all extracted. In a few cases, for example, the difference between the whole vehicle environment temperature value T1 and the preset environment high temperature value and the difference between the whole vehicle environment temperature value T1 and the preset environment low temperature value are smaller, and when the whole vehicle environment temperature value T1 and the preset environment low temperature value are completely extracted, the temperature of the power battery can be unstable, only part of the heat insulation material can be extracted.
By loading the heat preservation function requirement under the condition that the whole vehicle environment temperature value T1 is larger than the preset environment high temperature value or the whole vehicle environment temperature value T1 is smaller than the preset environment low temperature value, the power battery can obtain a proper temperature in extremely cold or extremely hot weather, the performance of the power battery is prevented from being damaged, and the problems of starting, driving difficulty or faults of the vehicle are avoided. Through unloading the heat preservation function demand under the circumstances that whole car ambient temperature value T1 is less than the high temperature value of preset environment, and whole car ambient temperature value T1 is greater than the low temperature value of preset environment for when whole car ambient temperature value T1 is comparatively suitable, take out insulation material, alleviate whole car weight, promote vehicle driving experience, reduce vehicle use cost.
Further, the method further comprises:
under the condition that the whole vehicle environment temperature value T1 is smaller than a preset environment low temperature value, the heat insulation material is a first phase change material, the first phase change material has a first critical temperature, and the first phase change material releases heat energy under the condition that the whole vehicle environment temperature value T1 is smaller than or equal to the first critical temperature;
under the condition that the whole vehicle environment temperature value T1 is larger than a preset environment high temperature value, the heat insulation material is a second phase change material, the second phase change material has a second critical temperature, and the second phase change material absorbs heat energy under the condition that the whole vehicle environment temperature value T1 is larger than or equal to the second critical temperature.
As shown in fig. 6, the process of heat preservation according to the whole vehicle ambient temperature value T1 is as follows: step 1, filling a first phase change material (namely the phase change material 1 in fig. 6) in a winter ultralow temperature environment; step 2, changing the external environment from ultra-low temperature environment in winter to normal temperature environment, and evacuating the phase change material (phase change material 1); step 3, filling a second phase change material (namely the phase change material 2 in fig. 6) in a summer ultra-high temperature environment; and 4, evacuating the phase change material (phase change material 2) when the external environment is changed from the ultra-high temperature environment in summer to the normal temperature environment.
By applying the technical scheme of the embodiment, the proper heat-insulating material is selected according to the external environment, so that the power battery can be well radiated in the ultra-high temperature environment in summer, and can be well heated and insulated in the ultra-low temperature environment in winter, the problem of performance damage caused by the fact that the temperature of the power battery is too high or too low is avoided, the use experience of a vehicle is improved, and the problems of difficult starting in winter, limited cruising, high-temperature failure in summer and the like are avoided.
The above-described method embodiments may be performed in an electronic device or similar computing device in a vehicle that includes a memory and a processor. Taking an example of operation on the vehicle's electronic device, as shown in fig. 3, the vehicle's electronic device may include one or more processors 102 (which may include, but are not limited to, a Central Processing Unit (CPU), a Graphics Processor (GPU), a Digital Signal Processing (DSP) chip, a Microprocessor (MCU), a programmable logic device (FPGA), a neural Network Processor (NPU), a Tensor Processor (TPU), an Artificial Intelligence (AI) type processor, etc., and a memory 104 for storing data. Optionally, the electronic apparatus of the vehicle may further include a transmission device 106, an input-output device 108, and a display 110 for communication functions. It will be appreciated by those skilled in the art that the configuration shown in fig. 3 is merely illustrative and is not intended to limit the configuration of the electronic device of the vehicle described above. For example, the electronic device of the vehicle may also include more or fewer components than the above structural description, or have a different configuration than the above structural description.
The memory 104 may be used to store a computer program, for example, a software program of application software and a module, such as a computer program corresponding to the power battery thermal insulation control method in the embodiment of the present invention, and the processor 102 executes the computer program stored in the memory 104, thereby performing various functional applications and data processing, that is, implementing the power battery thermal insulation control method described above. Memory 104 may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include memory remotely located relative to the processor 102, which may be connected to the mobile terminal via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The transmission device 106 is used to receive or transmit data via a network. Specific examples of the network described above may include a wireless network provided by a communication provider of the mobile terminal. In one example, the transmission device 106 includes a network adapter (Network Interface Controller, simply referred to as NIC) that can connect to other network devices through a base station to communicate with the internet. In one example, the transmission device 106 may be a Radio Frequency (RF) module, which is configured to communicate with the internet wirelessly.
The display 110 may be, for example, a touch screen type Liquid Crystal Display (LCD). The liquid crystal display may enable a user to interact with a user interface of the mobile terminal. In some embodiments, the mobile terminal has a Graphical User Interface (GUI), and the user may interact with the GUI by touching finger contacts and/or gestures on the touch-sensitive surface, where the man-machine interaction functions optionally include the following interactions: creating web pages, drawing, word processing, making electronic documents, games, video conferencing, instant messaging, sending and receiving electronic mail, talking interfaces, playing digital video, playing digital music, and/or web browsing, etc., executable instructions for performing the above-described human-machine interaction functions are configured/stored in a computer program product or readable storage medium executable by one or more processors.
An embodiment of the invention also provides a storage medium having a computer program stored therein, wherein the computer program is arranged to perform the steps of any of the method embodiments described above when run.
Alternatively, in the present embodiment, the above-described storage medium may be configured to store a computer program for performing the steps of:
Step S1, detecting a whole vehicle working state, a battery system working state, a whole vehicle environmental temperature value T1, a battery minimum temperature value T2, a current battery temperature difference value delta T, a remaining range R1, a user expected range R2, a closed air pressure P1 in an insulation box 211 and an external air pressure P0, wherein the current battery temperature difference value delta T is a difference value between the whole vehicle environmental temperature value T1 and the battery minimum temperature value T2;
step S2, under the condition that the working state of the whole vehicle and the working state of the battery system are normal, the closed air pressure P1 is equal to the external air pressure P0, and the current battery temperature difference delta T is in a normal temperature difference range, determining a heat preservation requirement based on the whole vehicle environment temperature value T1, wherein the heat preservation requirement at least comprises a load heat preservation function requirement and an unload heat preservation function requirement;
step S3, under the condition that the remaining range R1 is smaller than the expected range R2 of the user, obtaining user demand information, wherein the user demand information at least comprises one of the following steps: a vehicle start demand and a vehicle travel demand;
step S4, based on the user demand information, the whole vehicle environment temperature value T1 and the heat preservation demand, generating heat preservation material information, wherein the heat preservation material information at least comprises one of the following components: the type of the heat-insulating material, the filling amount of the heat-insulating material and the extraction amount of the heat-insulating material;
Step S5, based on the insulation material information, a control instruction set is generated, the control instruction set is used to control the filling machine to fill the insulation structure 21 with the insulation material, and the control instruction set is used to control the filling machine to draw out the insulation material from the insulation structure 21.
Alternatively, in the present embodiment, the storage medium may include, but is not limited to: a usb disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a removable hard disk, a magnetic disk, or an optical disk, or other various media capable of storing a computer program.
Embodiments of the invention also provide a processor arranged to run a computer program to perform the steps of any of the method embodiments described above.
Alternatively, in the present embodiment, the above-described processor may be configured to execute the following steps by a computer program:
step S1, detecting a whole vehicle working state, a battery system working state, a whole vehicle environmental temperature value T1, a battery minimum temperature value T2, a current battery temperature difference value delta T, a remaining range R1, a user expected range R2, a closed air pressure P1 in an insulation box 211 and an external air pressure P0, wherein the current battery temperature difference value delta T is a difference value between the whole vehicle environmental temperature value T1 and the battery minimum temperature value T2;
Step S2, under the condition that the working state of the whole vehicle and the working state of the battery system are normal, the closed air pressure P1 is equal to the external air pressure P0, and the current battery temperature difference delta T is in a normal temperature difference range, determining a heat preservation requirement based on the whole vehicle environment temperature value T1, wherein the heat preservation requirement at least comprises a load heat preservation function requirement and an unload heat preservation function requirement;
step S3, under the condition that the remaining range R1 is smaller than the expected range R2 of the user, obtaining user demand information, wherein the user demand information at least comprises one of the following steps: a vehicle start demand and a vehicle travel demand;
step S4, based on the user demand information, the whole vehicle environment temperature value T1 and the heat preservation demand, generating heat preservation material information, wherein the heat preservation material information at least comprises one of the following components: the type of the heat-insulating material, the filling amount of the heat-insulating material and the extraction amount of the heat-insulating material;
step S5, based on the insulation material information, a control instruction set is generated, the control instruction set is used to control the filling machine to fill the insulation structure 21 with the insulation material, and the control instruction set is used to control the filling machine to draw out the insulation material from the insulation structure 21.
The embodiment of the invention also provides a vehicle, the vehicle is provided with a power battery, the box body of the power battery is the power battery box body in the embodiment, and the vehicle adopts the power battery heat preservation control method in the embodiment to carry out power battery heat preservation control.
Alternatively, the vehicle may be a pure electric vehicle, a plug-in hybrid vehicle, an extended range hybrid vehicle, or other types of vehicles.
Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
In addition to the foregoing, references in the specification to "one embodiment," "another embodiment," "an embodiment," etc., mean that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment described in general terms in the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with any embodiment, it is intended that such feature, structure, or characteristic be implemented within the scope of the invention.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (15)

1. A power cell housing comprising:
a case body (31), the case body (31) having an accommodation space provided with at least one battery module (11);
the heat insulation structure (21), the heat insulation structure (21) set up in the accommodation space, heat insulation material has been filled in the heat insulation structure (21), heat insulation material be used for with battery module (11) carries out heat exchange.
2. The power cell box according to claim 1, characterized in that the insulating structure (21) comprises:
the heat preservation box body (211), heat preservation box body (211) set up in accommodation space's bottom, offer a plurality of heat transfer chamber (213) in heat preservation box body (211), a plurality of be linked together between heat transfer chamber (213) and set up, heat transfer chamber (213) intussuseption is filled with heat preservation material.
3. The power battery box body according to claim 2, wherein the heat insulation box body (211) is of a plate-shaped structure, and the heat exchange cavity (213) is arranged in an extending manner along the horizontal direction of the heat insulation box body (211).
4. The power battery box according to claim 2, characterized in that at least one material filling opening (214) is formed in the heat insulation box (211), the material filling opening (214) is arranged in communication with at least one heat exchange cavity (213), the material filling opening (214) is used for filling the heat insulation material into the heat exchange cavity (213), and/or the material filling opening (214) is used for extracting the heat insulation material from the heat exchange cavity (213).
5. The power battery box according to claim 4, characterized in that a liquid level sensor is arranged at the material filling port (214), and the liquid level sensor is used for detecting the filling amount of the heat insulation material in the heat exchange cavity (213).
6. The power cell housing according to claim 4, characterized in that an automatic locking mechanism is provided at the material filling opening (214), said automatic locking mechanism having a locking position blocking the material filling opening (214) and an opening position opening the material filling opening (214).
7. The power battery box body according to claim 2, wherein an air pressure balance valve (215) is further arranged on the heat insulation box body (211), the air pressure balance valve (215) is communicated with the heat exchange cavity (213), the air pressure balance valve (215) has an open state and a closed state, when the closed air pressure P1 in the heat insulation box body (211) is equal to the external air pressure P0, the air pressure balance valve (215) is in the closed state, and when the closed air pressure P1 in the heat insulation box body (211) is not equal to the external air pressure P0, the air pressure balance valve (215) is in the open state.
8. The power cell housing of claim 1, wherein the insulating material comprises a first phase change material for releasing thermal energy, the first phase change material having a first critical temperature, wherein-36 ℃ is less than or equal to-35 ℃ of the first critical temperature.
9. The power cell box of claim 1 or 8, wherein the insulating material comprises a second phase change material for absorbing thermal energy, the second phase change material having a second critical temperature, wherein 39 ℃ to 40 ℃ is less than the second critical temperature.
10. The power cell housing of claim 1, further comprising:
an outer protective structure (216), the outer protective structure (216) is arranged outside the box body (31), and the outer protective structure (216) is made of shock absorbing materials.
11. The power cell housing of claim 10, wherein the outer protective structure (216) is a PVC coating.
12. The power battery box according to claim 1, characterized in that a box mounting mechanism (41) is provided on a side wall of at least one of the box bodies (31), and the power battery box is connected with a vehicle body through the box mounting mechanism (41).
13. A power battery thermal insulation control method, characterized in that the power battery thermal insulation control method adopts the power battery box body according to any one of claims 1-12 for thermal insulation control, and the method comprises the following steps:
detecting the working state of the whole vehicle, the working state of a battery system, a temperature value T1 of the environment of the whole vehicle, a temperature value T2 of the lowest battery, a current battery temperature difference value delta T, a remaining range R1, a user expected range R2, a closed air pressure P1 in an insulation box (211) and an external air pressure P0, wherein the current battery temperature difference value delta T is a difference value between the temperature value T1 of the environment of the whole vehicle and the temperature value T2 of the lowest battery;
under the condition that the working state of the whole vehicle and the working state of the battery system are normal, the closed air pressure P1 is equal to the external air pressure P0, and the current battery temperature difference delta T is in a normal temperature difference range, determining a heat preservation requirement based on the whole vehicle environment temperature value T1, wherein the heat preservation requirement at least comprises a load heat preservation function requirement and an unload heat preservation function requirement;
under the condition that the remaining range R1 is smaller than the expected range R2 of the user, obtaining user demand information, wherein the user demand information at least comprises one of the following steps: a vehicle start demand and a vehicle travel demand;
Based on the user demand information, the whole vehicle environment temperature value T1 and the heat preservation demand, generating heat preservation material information, wherein the heat preservation material information at least comprises one of the following components: the type of the heat preservation material, the filling amount of the heat preservation material and the extraction amount of the heat preservation material;
based on the insulation material information, a control instruction set is generated, wherein the control instruction set is used for controlling a filling machine to fill the insulation material into the insulation structure (21), and the control instruction set can be used for controlling the filling machine to draw out the insulation material from the insulation structure (21).
14. The power battery thermal insulation control method according to claim 13, characterized in that determining a thermal insulation demand based on the whole vehicle ambient temperature value T1 includes:
determining the heat preservation requirement as a heat preservation function loading requirement under the condition that the whole vehicle environment temperature value T1 is larger than a preset environment high temperature value or the whole vehicle environment temperature value T1 is smaller than a preset environment low temperature value;
and determining the heat preservation requirement as an unloading heat preservation function requirement under the condition that the whole vehicle environment temperature value T1 is smaller than the preset environment high temperature value and the whole vehicle environment temperature value T1 is larger than the preset environment low temperature value.
15. The power cell thermal insulation control method as defined in claim 14, further comprising:
when the whole vehicle environment temperature value T1 is smaller than the preset environment low temperature value, the heat insulation material is a first phase change material, the first phase change material has a first critical temperature, and the first phase change material releases heat energy when the whole vehicle environment temperature value T1 is smaller than or equal to the first critical temperature;
and under the condition that the whole vehicle environment temperature value T1 is larger than the preset environment high temperature value, the heat insulation material is a second phase change material, the second phase change material has a second critical temperature, and the second phase change material absorbs heat energy under the condition that the whole vehicle environment temperature value T1 is larger than or equal to the second critical temperature.
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