CN114335816B - Self-heating battery thermal management control device, battery assembly, electric vehicle and method - Google Patents

Self-heating battery thermal management control device, battery assembly, electric vehicle and method Download PDF

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Publication number
CN114335816B
CN114335816B CN202111444109.0A CN202111444109A CN114335816B CN 114335816 B CN114335816 B CN 114335816B CN 202111444109 A CN202111444109 A CN 202111444109A CN 114335816 B CN114335816 B CN 114335816B
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heating
self
battery
temperature
cooling
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CN114335816A (en
Inventor
王德平
卢军
孙焕丽
于长虹
许立超
刘鹏
李黎黎
岳振东
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FAW Group Corp
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FAW Group Corp
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Priority to PCT/CN2022/108492 priority patent/WO2023098116A1/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
    • H01M10/613—Cooling or keeping cold
    • 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
    • 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
    • H01M10/655—Solid structures for heat exchange or heat conduction
    • 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
    • H01M10/6554—Rods or plates
    • 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
    • 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
    • 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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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Automation & Control Theory (AREA)
  • Secondary Cells (AREA)

Abstract

The invention relates to a self-heating battery thermal management control device, a battery assembly, an electric vehicle and a method. The device comprises a battery module, a cooling system, a self-heating system and a heat conduction structure; the cooling system is arranged at the lower end of the battery module; the self-heating system is fixed at the lower end of the cooling system and connected with the anode and the cathode of the battery module to form a loop; and a heat conduction structure is arranged between the battery module and the cooling system. IGBT switch inside positive negative pole of switch, through battery BMS control with the high frequency break-make of self-heating high voltage pencil: after the high-frequency on-off is formed, the electric field high-frequency change exists in the self-heating high-voltage wire harness, a large amount of heat is generated by the induction current generated in the heater due to the electromagnetic induction phenomenon of the spiral line around the heater, and then the heating function of the heating fixing plate can be realized, and the heating fixing plate can be used for heating cooling liquid in a cooling system. The invention can realize the functions of high-efficiency cooling of the power battery and automatic heating of the battery pack, and improves the overall heat management efficiency of the power battery.

Description

Self-heating battery thermal management control device, battery assembly, electric vehicle and method
Technical Field
The invention relates to the technical field of automobiles, in particular to a self-heating battery thermal management control device, a battery assembly, an electric vehicle and a method.
Background
The importance of the thermal management system of the power battery as a key core part of the new energy automobile is self-evident. The structure of the current mainstream battery thermal management system is complex, and the integration with the lower box body cannot be realized.
In order to solve the above problems, the application with publication number CN112820979a discloses a power battery thermal management system and a power battery thermal management control method, wherein the system comprises an expansion tank, an electric water pump, a power battery, a cooling module, a first electromagnetic valve, a second electromagnetic valve, a heat exchanger integrating an expansion valve, a third electromagnetic valve, an air conditioner compressor, a condensing and fuel heater assembly and a fourth electromagnetic valve. The control method, by using the system, comprises the following steps: acquiring a cooling liquid temperature Tb at an inlet of the power battery; if the coolant temperature Tb at the inlet of the power cell is greater than the lower limit temperature Tb0 at the inlet of the power cell, the first circulation passage or the second circulation passage is selectively opened. The thermal management system ensures that the battery works at a proper temperature, and the cooling module, the heat exchanger of the integrated expansion valve and the fuel oil heater assembly can be flexibly arranged according to conditions, so that the whole vehicle is not limited by the space of the whole vehicle, the arrangement is flexible, and the space utilization rate is high. But this application does not achieve the efficient cooling of the power cells and the automatic heating of the battery packs.
The application publication No. CN113386629A discloses a battery thermal management control method, device, medium and equipment. The method comprises the following steps: predicting the temperature of the battery in the target travel according to the road condition of the target travel, or predicting the temperature of the battery in the target charging process according to the magnitude of charging current in the target charging process; the battery is heated or cooled according to the predicted temperature control. That is, the change of the battery temperature in the future charge/discharge process is predicted according to the use condition of the battery, and the battery is in a better working state by performing thermal management according to the predicted temperature, so that the redundancy of the system is effectively reduced, unnecessary energy waste is reduced, and the thermal management power consumption of the whole vehicle is reduced. But this application does not achieve the efficient cooling of the power cells and the automatic heating of the battery packs.
The application publication No. CN113422130A discloses a battery thermal management control method, a battery management controller, a system and a vehicle. The method comprises the following steps: and (3) acquiring the maximum heating temperature value of the current module, comparing the maximum heating temperature value with a preset temperature threshold, closing a heating loop of the current module if the maximum heating temperature value of the current module is greater than or equal to the preset temperature threshold, selecting the module with the shortest closing time from the current modules closing the heating loop as a target module, acquiring the temperature value of the target module and the maximum temperature value of other non-closed modules, comparing the temperature value of the target module and the maximum temperature value of other non-closed modules, and closing the heating loop of the other non-closed modules if the maximum temperature value of the other non-closed modules is greater than or equal to the temperature value of the target module. The battery management controller closes the heating loop of the module according to the comparison result of the module temperature values, reduces the temperature difference of the module, and improves the service life of the power battery system and the whole vehicle endurance mileage. But this application does not achieve the efficient cooling of the power cells and the automatic heating of the battery packs.
Disclosure of Invention
The invention provides a self-heating battery thermal management control device, a battery assembly, an electric vehicle and a method, which can realize the functions of efficient cooling of a power battery and automatic heating of a battery pack and improve the overall thermal management efficiency of the power battery.
The technical scheme of the invention is as follows in combination with the accompanying drawings:
in one aspect, a self-heating battery thermal management control device is provided, including a battery module 1, a cooling system 2, a self-heating system 3, and a heat conducting structure 4; the cooling system 2 is arranged at the lower end of the battery module 1; the self-heating system 3 is fixed at the lower end of the cooling system 2 and is connected with the anode and the cathode of the battery module 1 into a loop; a heat conducting structure 4 is arranged between the battery module 1 and the cooling system 2.
A switch anode and cathode 101 is arranged at the anode and cathode output position of the battery module 1; the switching positive and negative electrodes 101 are connected to the battery BMS.
The self-heating system 3 includes a heater 301, a self-heating high-voltage wire harness 302, and a heating fixing plate 303; the heater 301 is disposed at the bottommost portion of the self-heating system 3; the heating fixing plate 303 is arranged at the bottom of the cooling system 2 and is in direct contact with the cooling system 2; the self-heating high-voltage wire bundle 302 is wound around the heater 301 to form a spiral wire, one end of the spiral wire is close to the heating fixing plate 303, and the other end of the spiral wire is far away from the heating fixing plate 303 and is positioned at the bottom of the heater 301; the two ends of the spiral lines connected in parallel to form a loop are respectively connected with the positive electrode 101 and the negative electrode 101 of the switch to form a power supply loop.
The switch anode and cathode 101 is internally provided with an IGBT switch; the IGBT switch is connected with the battery BMS.
The heat conducting structure 4 is a heat conducting glue or a heat conducting pad.
In a second aspect, a battery assembly is provided that includes a battery thermal management device.
In a third aspect, an electric vehicle is provided that includes a battery assembly.
In a fourth aspect, a control method of a self-heating battery thermal management control device is provided, which is implemented by a self-heating battery thermal management control device, and includes the following steps:
step one, a battery BMS receives a thermal management request signal and collects the temperature of a battery module 1;
step two, the battery BMS judges according to the collected temperature, and judges the thermal management requirement;
step three, the battery BMS gives an instruction according to the thermal management requirement judged in the step two and executes the instruction; the instructions fall into three thermal management modes: cooling mode, normal heating mode, self-heating mode; in the heating mode, if the battery assembly needs to be heated quickly in a short time, a self-heating mode is selected, otherwise, a common heating mode is selected;
step four, carrying out signal feedback on the thermal management mode to see whether the index requirement is met, and if the index requirement is not met, repeating the step three; otherwise, control of thermal management is exited.
In the third step, the following conditions are satisfied when the cooling mode is executed:
T max ≥T lk when the battery BMS sends a cooling instruction to the whole vehicle VCU, the whole vehicle heat management water pump and the cooling loop are started to circulate, and the cooling liquid in the cooling system 2 is started to circulate to cool the battery module 1;
wherein T is max Is the current highest temperature; t (T) lk The temperature is turned on for the cooling mode;
the following conditions need to be satisfied when the normal heating mode is performed:
T min ≤T jk when the battery BMS sends a heating instruction to the whole vehicle VCU, the whole vehicle heat management water pump and the heating loop are started to circulate, and the cooling liquid in the cooling system 2 is started to circulate so as to perform common heating on the battery module 1;
wherein T is jm -T jk ≥6℃；T min Is the current minimum temperature; t (T) jk The temperature is the starting temperature of the common heating mode; t (T) jm Target temperature for normal heating mode;
the following conditions need to be satisfied when executing the self-heating mode:
T min ≤T zjk when the battery BMS controls the positive electrode 101 and the negative electrode 101 of the switch, high-frequency on-off is realized, and self-heating is carried out on the battery module 1; wherein T is zjm -T zjk ≥5℃；T min Is the current minimum temperature; t (T) zjk Is the self-heating mode on temperature; t (T) zjm Target temperature for self-heating mode;
in addition, the heating temperature difference and the heating power of the on self-heating mode are obtained by the following formula:
T c ＝T zjm -T min ；
wherein θ is a safety factor, and is obtained according to test calibration, and the value range is obtainedT c Is the heating temperature difference; t (T) Q Is heating power; alpha is a structural characteristic coefficient, and the value range is more than or equal to 1.12 and less than or equal to 1.21; beta is a heat loss compensation coefficient, and the value range is more than or equal to 1.05 and less than or equal to 1.13; q is the weight of the battery module; c (C) c The specific heat capacity of the battery module.
The index requirements in the fourth step are specifically as follows:
cooling mode: t (T) max ≤T lm Reaching the standard; wherein T is max Is the current highest temperature; t (T) lm Target temperature for cooling mode;
common heating mode: t (T) min ≥T jm Reaching the standard; wherein T is min Is the current minimum temperature; t (T) jm Target temperature for normal heating mode;
self-heating mode: t (T) min ≥T zjm Reaching the standard; wherein T is min Is the current minimum temperature; t (T) zjm Is the self-heating mode target temperature.
The beneficial effects of the invention are as follows:
1) The self-heating battery thermal management control device is simple in structure, the power battery can realize self-heating, and the overall thermal management efficiency of the power battery is improved;
2) The self-heating battery thermal management control method can realize effective control of the heating function and the cooling function of the battery thermal management system.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a self-heating battery thermal management control device according to the present invention;
FIG. 2 is a schematic top view of a self-heating battery thermal management control device according to the present invention;
FIG. 3 is a schematic diagram of a self-heating system according to the present invention;
FIG. 4 is a schematic view of another angle structure of a self-heating battery thermal management control device according to the present invention;
fig. 5 is a flowchart of a self-heating battery thermal management control method according to the present invention.
In the figure:
1. a battery module;
101. a switch anode and a switch cathode;
2. a cooling system;
3. a self-heating system;
301. a heater; 302. self-heating high voltage wire harness; 303. heating the fixing plate;
4. a heat conducting structure.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are orientation or positional relationships based on those shown in the drawings, merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the invention. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Example 1
Referring to fig. 1, 2 and 4, a self-heating battery thermal management control device includes a battery module 1, a cooling system 2, a self-heating system 3 and a heat conducting structure 4.
The battery module 1 is placed inside a battery pack. A switch anode and cathode 101 is arranged at the anode and cathode output position of the battery module 1; the switch anode and cathode 101 is internally provided with an IGBT switch; the IGBT switch is connected with the battery BMS. The battery BMS is mainly responsible for signal acquisition of the battery module 1 and controls the battery module 1.
The cooling system 2 is disposed at the lower end of the battery module 1.
The self-heating system 3 is fixed at the lower end of the cooling system 2 and is connected with the anode and the cathode of the battery module 1 into a loop;
referring to fig. 2 and 3, the self-heating system 3 includes a heater 301, a self-heating high-voltage wire harness 302, and a heating fixing plate 303; the heater 301 is disposed at the bottommost portion of the self-heating system 3; the heating fixing plate 303 is arranged at the bottom of the cooling system 2 and is in direct contact with the cooling system 2; the self-heating high-voltage wire bundle 302 is wound around the heater 301 to form a spiral parallel connection, specifically, one end close to the heating fixing plate 303 is connected together, and one end far from the heating fixing plate 303 is connected together.
Specifically, two ends of a loop formed by connecting spiral lines around the heater 301 below the single battery module 1 in parallel are respectively connected with the positive electrode 101 and the negative electrode 101 of the switch on the battery module 1 to form a power supply loop;
the IGBT switch inside the switch anode 101 can be controlled by the battery BMS to be connected to and disconnected from the high frequency of the self-heating high voltage wire harness 302: after the high-frequency on-off is formed, the self-heating high-voltage wire bundle 302 has high-frequency change of an electric field, and a large amount of heat is generated by the induction current generated in the heater 301 due to the electromagnetic induction phenomenon through the spiral wire around the heater 301, so that the heating function of the heating fixing plate 303 can be realized, and the heating fixing plate 303 can realize the heating of the cooling liquid in the cooling system 2.
Among them, the heater 301 is made of materials including, but not limited to, aluminum alloy, iron alloy, titanium alloy, copper alloy, etc. which can rapidly generate a large amount of heat in the electric field eddy current varying at high frequency.
The self-heating high voltage wire harness 302 is made of a material including, but not limited to, a metal material such as an aluminum alloy, a titanium alloy, a copper alloy, and the like.
The heating fixing plate 303 is made of non-metal materials with high thermal conductivity and high insulativity, such as silica gel, polyurethane, and the like.
A heat conducting structure 4 is arranged between the battery module 1 and the cooling system 2, and the heat conducting structure has the main functions of heat transfer and insulation on the battery module 1.
The pattern of the heat conducting structure 4 includes, but is not limited to, a structure that can conduct heat rapidly, such as a heat conducting glue, a heat conducting pad, etc.
Example two
The embodiment provides a battery assembly, which comprises a self-heating battery thermal management control device in the first embodiment. The battery assembly adopts the self-heating battery thermal management control device in the first embodiment, and the self-heating system realizes the functions of high-efficiency cooling of the battery assembly and automatic heating of the battery pack, thereby improving the overall thermal management efficiency of the battery assembly.
Example III
The present embodiment provides an electric vehicle including a battery assembly in the second embodiment. The battery assembly adopts the self-heating battery thermal management control device in the first embodiment, and the self-heating system realizes the functions of high-efficiency cooling and automatic heating of the battery assembly, improves the overall thermal management efficiency of the battery assembly, and further can effectively ensure the safety of the electric vehicle and reduce the research and development cost.
Example IV
Referring to fig. 5, a control method of a self-heating battery thermal management control device is implemented by a self-heating battery thermal management control device, and includes the following steps:
step one, a battery BMS receives a thermal management request signal and collects the temperature of a battery module 1;
step two, the battery BMS judges according to the collected temperature, and judges the thermal management requirement;
step three, the battery BMS gives an instruction according to the thermal management requirement judged in the step two and executes the instruction; the instructions fall into three thermal management modes: cooling mode, normal heating mode, self-heating mode; in the heating mode, if the battery assembly needs to be heated quickly in a short time, a self-heating mode is selected, otherwise, a common heating mode is selected;
the following conditions are satisfied when the cooling mode is executed:
T max ≥T lk when the battery BMS sends a cooling instruction to the whole vehicle VCU, the whole vehicle heat management water pump and the cooling loop are started to circulate, and the cooling liquid in the cooling system 2 is started to circulate to cool the battery module 1;
wherein T is max Is the current mostHigh temperature; t (T) lk The temperature is turned on for the cooling mode;
the following conditions need to be satisfied when the normal heating mode is performed:
T min ≤T jk when the battery BMS sends a heating instruction to the whole vehicle VCU, the whole vehicle heat management water pump and the heating loop are started to circulate, and the cooling liquid in the cooling system 2 is started to circulate so as to perform common heating on the battery module 1;
wherein T is jm -T jk ≥6℃；T min Is the current minimum temperature; t (T) jk The temperature is the starting temperature of the common heating mode; t (T) jm Target temperature for normal heating mode;
the following conditions need to be satisfied when executing the self-heating mode:
T min ≤T zjk when the battery BMS controls the positive electrode 101 and the negative electrode 101 of the switch, high-frequency on-off is realized, and self-heating is carried out on the battery module 1; wherein T is zjm -T zjk ≥5℃；T min Is the current minimum temperature; t (T) zjk Is the self-heating mode on temperature; t (T) zjm Target temperature for self-heating mode;
in addition, the heating temperature difference and the heating power of the on self-heating mode are obtained by the following formula:
T c ＝T zjm -T min ；
wherein θ is a safety factor, and is obtained according to test calibration, and the value range is obtainedT c Is the heating temperature difference; t (T) Q Is heating power; alpha is a structural characteristic coefficient, and the value range is more than or equal to 1.12 and less than or equal to 1.21; beta is a heat loss compensation coefficient, and the value range is more than or equal to 1.05 and less than or equal to 1.13; q is the weight of the battery module; c (C) c The specific heat capacity of the battery module.
And primarily judging the required power according to the heat generation requirement, and further optimizing the energy utilization rate. Realizing rapid heating.
Step four, carrying out signal feedback on the thermal management mode to see whether the index requirement is met, and if the index requirement is not met, repeating the step three; otherwise, control of thermal management is exited.
The index requirements are specifically as follows:
cooling mode: t (T) max ≤T lm Reaching the standard; wherein T is max Is the current highest temperature; t (T) lm Target temperature for cooling mode;
common heating mode: t (T) min ≥T jm Reaching the standard; wherein T is min Is the current minimum temperature; t (T) jm Target temperature for normal heating mode;
self-heating mode: t (T) min ≥T zjm Reaching the standard; wherein T is min Is the current minimum temperature; t (T) zjm Is the self-heating mode target temperature.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
In addition, the specific features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations are not described further.
Moreover, any combination of the various embodiments of the invention can be made without departing from the spirit of the invention, which should also be considered as disclosed herein.
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the scope of the present invention is not limited to the specific details of the above embodiments, and within the scope of the technical concept of the present invention, any person skilled in the art may apply equivalent substitutions or alterations to the technical solution according to the present invention and the inventive concept thereof within the scope of the technical concept of the present invention, and these simple modifications are all within the scope of the present invention.

Claims (4)

1. The self-heating battery thermal management control device is characterized by comprising a battery module (1), a cooling system (2), a self-heating system (3) and a heat conduction structure (4); the cooling system (2) is arranged at the lower end of the battery module (1); the self-heating system (3) is fixed at the lower end of the cooling system (2) and is connected with the anode and the cathode of the battery module (1) to form a loop; a heat conduction structure (4) is arranged between the battery module (1) and the cooling system (2);
a switch anode and cathode (101) is arranged at the anode and cathode output position of the battery module (1); the positive electrode and the negative electrode (101) of the switch are connected with the battery BMS;
the self-heating system (3) comprises a heater (301), a self-heating high-voltage wire harness (302) and a heating fixing plate (303); the heater (301) is arranged at the bottommost part of the self-heating system (3); the heating fixing plate (303) is arranged at the bottom of the cooling system (2) and is in direct contact with the cooling system (2); the self-heating high-voltage wire harness (302) is wound around the heater (301) to form a spiral wire, one end of the spiral wire is close to the heating fixing plate (303), and the other end of the spiral wire is far away from the heating fixing plate (303) and is positioned at the bottom of the heater (301); two ends of the spiral lines connected in parallel to form a loop are respectively connected with the anode and the cathode of the switch (101) to form a power supply loop;
the switch anode and cathode (101) is internally provided with an IGBT switch; the IGBT switch is connected with the battery BMS;
the heat conducting structure (4) is heat conducting glue or heat conducting pad.
2. A battery assembly comprising a battery thermal management device of claim 1.
3. An electric vehicle comprising a battery assembly as defined in claim 2.
4. The control method of a self-heating battery thermal management control device according to claim 1, comprising the steps of:
step one, a battery BMS receives a thermal management request signal and collects the temperature of a battery module (1);
step two, the battery BMS judges according to the collected temperature, and judges the thermal management requirement;
step three, the battery BMS gives an instruction according to the thermal management requirement judged in the step two and executes the instruction; the instructions fall into three thermal management modes: cooling mode, normal heating mode, self-heating mode; in the heating mode, if the battery assembly needs to be heated quickly in a short time, a self-heating mode is selected, otherwise, a common heating mode is selected;
step four, carrying out signal feedback on the thermal management mode to see whether the index requirement is met, and if the index requirement is not met, repeating the step three; otherwise, exiting the control of thermal management;
in the third step, the following conditions are satisfied when the cooling mode is executed:
≥/>when the battery BMS sends a cooling instruction to the whole vehicle VCU, a whole vehicle heat management water pump and a cooling loop are started to circulate, and cooling liquid in a cooling system (2) is started to circulate to cool the battery module (1);
wherein,is the current highest temperature; />The temperature is turned on for the cooling mode;
the following conditions need to be satisfied when the normal heating mode is performed:
≤/>when the battery BMS sends a heating instruction to the whole vehicle VCU, the whole vehicle heat management water pump and the heating loop are started to circulate, and the cooling liquid in the cooling system (2) is started to circulate so as to perform common heating on the battery module (1);
wherein,-/>≥6℃；/>is the current minimum temperature; />The temperature is the starting temperature of the common heating mode; />A normal heating mode target temperature;
the following conditions need to be satisfied when executing the self-heating mode:
≤/>when the battery BMS controls the positive electrode and the negative electrode (101) of the switch, high-frequency on-off is realized, and self-heating is carried out on the battery module (1); wherein->-/>≥5℃；/>Is the current minimum temperature; />Is the self-heating mode on temperature; />Target temperature for self-heating mode;
in addition, the heating temperature difference and the heating power of the on self-heating mode are obtained by the following formula:
=/>-/>；
=/>*/>*Q*/>*/>*/>
wherein,is a safety factor, and is obtained according to test calibration, the value range is +.>，/>Is the heating temperature difference; />Is heating power; />For the structural characteristic coefficient, the value range is 1.12 +.>1.21；/>The value range is 1.05 for the compensation coefficient of heat loss1.13; q is the weight of the battery module; />Specific heat capacity of the battery module;
the index requirements in the fourth step are specifically as follows:
cooling mode:≤/>reaching the standard; wherein (1)>Is the current highest temperature; />Target temperature for cooling mode;
common heating mode:≥/>reaching the standard; wherein (1)>Is the current minimum temperature; />Target temperature for normal heating mode;
self-heating mode:≥/>reaching the standard; wherein (1)>Is the current minimum temperature; />Is the self-heating mode target temperature.
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