CN115626088A - Heat management control method and device for rechargeable battery pack and storage medium - Google Patents
Heat management control method and device for rechargeable battery pack and storage medium Download PDFInfo
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- CN115626088A CN115626088A CN202211140820.1A CN202211140820A CN115626088A CN 115626088 A CN115626088 A CN 115626088A CN 202211140820 A CN202211140820 A CN 202211140820A CN 115626088 A CN115626088 A CN 115626088A
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- 238000000034 method Methods 0.000 title claims abstract description 43
- 238000001816 cooling Methods 0.000 claims abstract description 147
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 64
- 238000010438 heat treatment Methods 0.000 claims abstract description 26
- 238000004891 communication Methods 0.000 claims abstract description 11
- 239000007788 liquid Substances 0.000 claims description 16
- 238000012545 processing Methods 0.000 claims description 7
- 230000004044 response Effects 0.000 claims description 5
- 238000004590 computer program Methods 0.000 claims description 4
- 239000000498 cooling water Substances 0.000 claims description 4
- 238000010030 laminating Methods 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 230000008859 change Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 7
- 239000000110 cooling liquid Substances 0.000 description 6
- 230000020169 heat generation Effects 0.000 description 5
- 238000012546 transfer Methods 0.000 description 5
- 238000005265 energy consumption Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000003507 refrigerant Substances 0.000 description 3
- 239000002826 coolant Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
- B60L58/26—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries by cooling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/54—Drive Train control parameters related to batteries
- B60L2240/545—Temperature
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2260/00—Operating Modes
- B60L2260/40—Control modes
- B60L2260/44—Control modes by parameter estimation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The invention belongs to the technical field of power battery pack management, and particularly relates to a heat management control method, a heat management control device and a storage medium for a rechargeable battery pack, wherein the method is applied to a control system, the control system comprises control equipment and a battery pack management system, the control equipment comprises a cooling loop, a water cooling plate and a vehicle control unit, the vehicle control unit is in communication connection with the cooling loop and the water cooling plate, the battery pack management system is in communication connection with the vehicle control unit, and the method comprises the following steps: when the battery pack is charged, the battery pack management system acquires the heat productivity of a battery core in the battery pack, and the vehicle control unit acquires the heat exchange quantity of a water cooling plate; and when the vehicle control unit receives the heating value information, comparing and judging the heating value information with the heat exchange quantity so as to adjust the working state of the cooling circuit. The purpose is as follows: the method is used for solving the problem that the power consumption of the whole vehicle is large when the power battery is charged, so that a user pays a part of cost when charging.
Description
Technical Field
The invention belongs to the technical field of power battery pack management, and particularly relates to a method and a device for controlling heat management of a rechargeable battery pack and a storage medium.
Background
With the popularization of new energy automobiles, electric automobiles have been the development direction of mainstream vehicle enterprises at present, and the technical issue surrounding power batteries has been the development direction of heat. In the process of using the vehicle at the ambient temperature and the normal temperature or the high temperature, when a user charges the power battery, the battery cell can continuously generate heat due to the fact that the battery cell has internal resistance. Generally, battery packs with quick charging capacity are provided with water cooling systems, and the systems can continuously take away heat generated by a battery core during charging in a convection heat transfer mode, so that the temperature of the battery core is prevented from being continuously increased due to the heat generated.
The main method for cooling the battery in the prior art is to utilize a battery pack assembly to integrate a water-cooled plate for heat exchange. The method for controlling the heat exchange is to send out a cooling request after the battery reaches a certain threshold temperature, and the power of the compressor is determined by the temperature of the water inlet of the water cooling plate. According to the charging map of the battery, the battery is always heated fastest when charging is fastest, and at the moment, although the battery reaches the starting threshold of the cooling system, the cooling liquid cannot rapidly exchange the electric core to generate heat due to the too fast temperature rise.
In some cases, the cooling delay of the battery cell often exists, so that the battery cell cannot obtain the maximum cooling capacity when the temperature rises fastest. In this case, if the battery temperature is used as a cooling request, firstly, the battery may not be charged under a large current for a long time, thereby affecting the charging time, and secondly, the waste of the compressor power may be caused, thereby increasing the power consumption of the entire vehicle; in other cases, the charging current is also reduced along with the gradual increase of the SOC of the battery at the end of charging, at this time, although the temperature of the battery cell is not rapidly reduced, the heat generated by the battery cell during the period from the beginning of the charging current to the end of charging is rapidly reduced, and if the temperature of the battery is still used as a cooling request, the power consumption of the whole vehicle is also large, so that a user pays a part of charge during charging.
Disclosure of Invention
The purpose of the invention is: the scheme can realize timely heat exchange, reduce energy consumption and reduce charging cost for users at normal temperature and high temperature during charging.
In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows:
in a first aspect, the application provides a rechargeable battery pack heat management control method, which is applied to a control system, the control system comprises a control device and a battery pack management system, the control device comprises a cooling circuit, a water cooling plate and a vehicle control unit, the water cooling plate is attached to a battery module in a battery pack, the cooling circuit is connected with the water cooling plate through a pipeline, the vehicle control unit is in communication connection with the cooling circuit and the water cooling plate, the battery pack management system is in communication connection with the vehicle control unit, and the method comprises the following steps:
when the battery pack is charged, the battery pack management system acquires the heat productivity of a battery core in the battery pack, and the vehicle control unit acquires the heat exchange quantity of a water cooling plate;
and when the vehicle control unit receives the heating value information, comparing and judging the heating value information with the heat exchange quantity so as to adjust the working state of the cooling circuit.
With reference to the first aspect, in some optional embodiments, the method further comprises:
when the battery pack management system obtains the heat productivity of the battery pack, the temperature sensor obtains the temperature of the battery cell in the battery pack, the temperature sensor compares the temperature with the temperature of the battery cell to obtain the highest temperature, the vehicle control unit obtains the SOC and the current of the battery pack, the SOC and the current form a charging map with the temperature of the battery cell, and the current value of the cooling loop in the cooling time period of the battery pack is predicted in an interpolation mode.
The current value of the cooling loop in the battery pack cooling time period is predicted through interpolation, so that timely heat exchange of heat productivity of the battery core when the cooling loop charges is facilitated, control of the cooling loop on the heat exchange quantity of the water cooling plate is facilitated, and waste caused by the fact that the cooling loop cannot timely exchange heat or the heat exchange quantity is too large is avoided.
With reference to the first aspect, in some optional embodiments, the method further comprises:
the vehicle control unit obtains a battery core internal resistance map formed by the battery core temperature, the SOC and the internal resistance value, interpolates the internal resistance value of the battery pack in the prediction time, and obtains the battery pack internal resistance value through a formula:
and calculating the heat productivity of the battery cell within the interpolation prediction time.
The effective heating value of the battery cell in the interpolation prediction time can be accurately calculated through the internal resistance value of the battery pack in the interpolation prediction time.
With reference to the first aspect, in some optional embodiments, the method further comprises:
and when the vehicle control unit obtains the heat exchange quantity of the water cooling plate, testing the maximum heat exchange power in the water cooling plate heat exchange power map through the cooling circuit, and calculating the maximum heat exchange quantity of the water cooling plate.
Through knowing the maximum heat transfer volume of water-cooling board, can know the maximum heat transfer volume to the battery package to be favorable to the control of cooling circuit power.
With reference to the first aspect, in some optional embodiments, the cooling circuit includes an electric compressor, a water-cooled condenser, a liquid storage tank, an electronic expansion valve, and a battery cooler, the electric compressor is connected to the water-cooled condenser through a pipeline, the water-cooled condenser is connected to the liquid storage tank through a pipeline, the liquid storage tank is connected to the battery cooler through a pipeline, and the electronic expansion valve is disposed on a pipeline between the liquid storage tank and the battery cooler;
and a cooling water pump is connected between the battery cooler and the water cooling plate, and an eight-way valve is connected between the water cooling plate and the battery cooler.
The coolant passing through the battery water-cooling plate exchanges heat with the refrigerant in the cooling circuit through the battery cooler after passing through the eight-way valve, and then the coolant can circularly cool the water-cooling plate through the work of the electric compressor, so that the heat exchange is carried out when the battery pack is charged.
With reference to the first aspect, in some optional embodiments, when the vehicle controller obtains the heat exchange amount of the water-cooling plate, by controlling the rotation speed of the electric compressor and the ratio of the high pressure and the low pressure at the inlet and the outlet of the electric compressor, the maximum heat exchange power in the water-cooling plate heat exchange power map is tested, and the maximum heat exchange amount of the water-cooling plate is calculated.
With reference to the first aspect, in some optional embodiments, the method further comprises:
when the heating value and the heat exchange amount are compared and judged, if the heating value of the electric core is less than or equal to the maximum heat exchange amount in unit time, adjusting the rotating speed of the electric compressor to the rotating speed value when the heating value and the heat exchange amount are equal under the high-low pressure ratio of the inlet and the outlet of the compressor;
if the heating value of the electric core is larger than the maximum heat exchange amount in unit time, and the rotating speed value of the compressor is adjusted to the rotating speed value when the maximum heat exchange amount is reached under the high-low pressure ratio of the inlet and the outlet of the compressor at the moment.
Through the comparison of calorific capacity and heat transfer volume to the rotational speed value of adjustment electric compressor makes electric compressor can adjust its power according to the heat transfer volume, and then can avoid electric compressor to do idle work, saves the consumption of electric energy, thereby reduces the power consumption of whole car when charging.
With reference to the first aspect, in some optional embodiments, the method further comprises:
when the heating value and the heat exchange quantity are compared and judged, according to a formula:
wherein, C bat Is the specific heat capacity of the cell, m bat And calculating the highest temperature of the battery cell at the end of unit time for the quality of the battery cell, and interpolating and predicting the current value of the electric compressor in the cooling time period of the response battery pack by using a charging map formed by the highest temperature of the battery cell, the SOC and the current by the vehicle controller.
The current value of the compressor at the end of the battery pack cooling time period is predicted through interpolation, so that the adjustment of the rotating speed value of the electric compressor is facilitated, and the rotating speed of the electric compressor can be changed along with the change of the heat exchange quantity.
In a second aspect, the present application further provides a rechargeable battery pack thermal management control device, which is applied to a control system, the control system includes a control device and a battery pack management system, the control device includes a cooling circuit, a water cooling plate and a vehicle control unit, the water cooling plate is arranged in the battery module laminating in the battery pack, the cooling circuit is connected with the water cooling plate, the vehicle control unit is connected with the cooling circuit and the water cooling plate in a communication manner, the battery pack management system is connected with the vehicle control unit in a communication manner, and the device further includes:
the sending unit is used for sending heat productivity information of a battery core in the battery pack and heat exchange quantity information of the water cooling plate when the battery pack is charged;
and the processing unit is used for receiving the heat productivity information of the battery core and the heat exchange amount information of the water cooling plate, and comparing and judging the heat productivity information and the heat exchange amount information of the water cooling plate, so that the working state of the cooling loop is adjusted.
When the battery pack is charged, the heating value information of the battery core in the battery pack and the heat exchange amount information of the water cooling plate are sent to the processing unit, so that the processing unit can control the working state of the cooling circuit after comparing and judging the heating value information and the heat exchange amount information of the water cooling plate, thereby controlling the heat exchange amount of the water cooling plate and reducing the consumption of the cooling circuit.
In a third aspect, the present application further provides a computer-readable storage medium, in which a computer program is stored, which, when run on a computer, causes the computer to perform the method described above.
The invention adopting the technical scheme has the advantages that:
the charging current of the battery pack is predicted through the SOC of the battery pack, the internal resistance and the temperature of the battery pack which are extracted by the vehicle control unit in real time, so that the heating value and the maximum heating value of the battery pack are calculated, the heating value of the compressor in response to the cooling time of the battery pack is calculated, the rotating speed value of an electric compressor in a cooling loop is adjusted, the rotating speed of the electric compressor can change along with the change of the heating value, the cooling loop can timely exchange heat for the battery pack, the heat dissipation requirement of a power battery is met, the energy consumption of the battery pack is minimum when the battery pack is charged, and the charging cost is saved for a user.
Drawings
The present application can be further illustrated by the non-limiting examples given in the figures. It is to be understood that the following drawings illustrate only certain embodiments of this application and are therefore not to be considered limiting of scope, for those skilled in the art to which they pertain further figures may be derived without inventive faculty;
FIG. 1 is a control logic diagram of a thermal management control method for a rechargeable battery pack according to the present invention;
fig. 2 is a diagram of a thermal management architecture of a battery pack in a thermal management control method of a rechargeable battery pack according to the present invention;
fig. 3 is a charging map result table of the battery cell in the thermal management control method of the rechargeable battery pack according to the present invention;
fig. 4 is a result table of the internal resistance map in the thermal management control method for the rechargeable battery pack according to the present invention;
FIG. 5 is a chart of the heat exchange power map of the water-cooling plate in the method for controlling the heat management of the rechargeable battery pack according to the present invention;
fig. 6 is a block diagram of a thermal management control device for a rechargeable battery pack according to the present invention;
the main element symbols are as follows:
Detailed Description
The present application will be described in detail with reference to the drawings and specific embodiments, wherein like reference numerals are used for similar or identical parts in the drawings or description, and implementations not shown or described in the drawings are known to those of ordinary skill in the art. In the description of the present application, the terms "first," "second," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Referring to fig. 1 to 5, a method for managing and controlling heat of a rechargeable battery pack provided in an embodiment of the present application is applied to a control system, where the control system includes a control device and a battery pack management system BMS, the control device includes a cooling circuit, a water-cooling plate and a vehicle control unit HCU, and the water-cooling plate is attached to a battery module in the battery pack and used for exchanging heat with the battery module in the battery pack. The cooling loop is connected with the water-cooling plate through a pipeline and used for controlling the circulation of cooling liquid between the cooling loop and the water-cooling plate. And the vehicle control unit HCU is in communication connection with the cooling circuit and the water cooling plate and is used for acquiring the working states of the cooling circuit and the water cooling plate and controlling the cooling circuit. The battery pack management system BMS is connected with the vehicle control unit HCU CAN bus, so that the vehicle control unit HCU CAN acquire the information of the battery pack management system BMS.
Referring to fig. 2, in the present embodiment, the cooling circuit includes an electric compressor, a water-cooled condenser, a liquid storage tank, an electronic expansion valve and a battery cooler, the electric compressor is fixedly connected to the water-cooled condenser through a pipeline, the water-cooled condenser is fixedly connected to the liquid storage tank through a pipeline, the liquid storage tank is fixedly connected to the battery cooler through a pipeline, and the electronic expansion valve is fixedly installed on the pipeline between the liquid storage tank and the battery cooler; a cooling water pump is connected between the battery cooler and the water cooling plate, and an eight-way valve is connected between the water cooling plate and the battery cooler.
The vehicle control unit HCU is connected with the electric compressor and the electronic expansion valve CAN bus, the cooling liquid passing through the battery water cooling plate exchanges heat with a refrigerant in the battery cooler and the water cooling condenser after passing through the eight-way valve, and the cooling liquid CAN circularly cool the water cooling plate by controlling the rotating speed of the electric compressor, so that the heat exchange is carried out when the battery pack is charged.
In this embodiment, the method includes the following specific steps:
s1, after charging is started, reading the temperature of a battery cell in a battery module in a battery pack sensed by a temperature sensor through a battery pack management system BMS (battery management system), and obtaining the highest temperature T through comparison 0 ；
S2, extracting the highest temperature T of the battery cell by the battery pack management system BMS 0 Sending the current to a vehicle control unit (HCU), extracting a charging map formed by the temperature of a battery core, the SOC and the current in a battery pack management system (BMS) by the HCU, and predicting the response battery pack cooling time period delta t of the electric compressor through interpolation 0 Internal current value
Wherein the electric compressor responds to the battery pack cooling time period Δ t 0 Goes out fromTesting before factory;
s3, extracting a battery cell internal resistance map formed by the battery cell temperature, the SOC and the internal resistance value of the battery pack management system BMS by the HCU of the vehicle control unit, and interpolating the predicted time delta t 0 Internal resistance of internal battery pack
The HCU of the vehicle control unit adopts the formula:
calculating the time Deltat 0 Heat generation of inner battery pack
S4, extracting the maximum heat exchange power P 'in the water cooling plate heat exchange power map tested by the ratio of the rotating speed of the electric compressor to the high pressure and the low pressure at the outlet of the compressor in the battery pack management system BMS through the HCU of the whole vehicle controller' max Calculating the time Deltat 0 Maximum heat exchange capacity of inner water cooling plate
Vehicle control unit (HCU) will time delta t 0 Heat generation of internal battery pack
And time deltat 0 Maximum heat exchange amount of inner water cooling plate
Carrying out comparison and judgment;
s5, judging by comparison as follows if the time delta t 0 Heat generation of internal battery pack
Time delta t ≦ time 0 Maximum heat exchange capacity of internal water cooling plate
At the moment, the HCU of the whole vehicle controller sends the signal according to the high-low pressure ratio at the inlet and outlet of the electric compressorSending a signal to a battery pack management system BMS for adjusting the rotational speed of the electric compressor to a time delta t 0 Heat generation of internal battery pack
And time deltat 0 Maximum heat exchange capacity of inner water cooling plate
Equal rotational speed values;
if the time Deltat 0 Heat generation of internal battery pack
>Time deltat 0 Maximum heat exchange capacity of internal water cooling plate
At the moment, under the high-low pressure ratio of the inlet and the outlet of the electric compressor, the HCU sends a signal to the BMS to adjust the rotating speed of the compressor to the maximum heat exchange amount
A rotational speed value of time;
s6, the HCU of the vehicle control unit is public:
calculating the time Deltat 0 Maximum temperature T of battery cell at end time 1 Wherein, C bat Is the specific heat capacity of the cell, m bat For the quality of the battery core, the HCU extracts a charging map consisting of temperature, SOC and current in a battery pack management system BMS, and interpolates and predicts the cooling time delta t of the response battery pack of the electric compressor 1 Current value in segment
Thereby adjusting the rotating speed of the electric compressor, and enabling the rotating speed of the electric compressor to change along with the change of the heat exchange quantity;
and S7, circularly repeating the step S2 to the step S6 until the charging is finished.
It should be noted that, be provided with 2 temperature sensor on every electric core, including a plurality of electric cores in every battery module, the battery includes a plurality of battery modules in including.
By the method, the charging map and the internal resistance map of the battery cell in the battery pack are tested, the test results are shown in the attached figures 3-4, and the attached figure 5 shows the power and the rotating speed corresponding to the ratio of the high voltage and the low voltage at the inlet and the outlet of the tested electric compressor.
The charging current I of the battery pack is predicted by extracting the real-time SOC, the internal resistance R and the battery temperature T of the battery pack in the CAN signal, and the cooling time delta T of the battery pack responding to the battery pack in a compressor is calculated i The internal heating power is adjusted, the rotating speed of the compressor is adjusted to meet the heat dissipation requirement of the power battery in time, meanwhile, the energy consumption of the heat management system is minimized, and the charging cost is saved for a user.
Referring to fig. 6, an embodiment of the present application further provides a thermal management control device for a rechargeable battery pack, where the control device includes a control device and a battery pack management system BMS, the control device includes a cooling circuit, a water cooling plate and a vehicle control unit HCU, the water cooling plate is attached to a battery cell of a battery module in the battery pack, the cooling circuit is connected to the water cooling plate, the vehicle control unit HCU is connected to the cooling circuit and the water cooling plate CAN, and the battery pack management system BMS is connected to the vehicle control unit HCU CAN.
In this embodiment, the cooling circuit includes an electric compressor, a water-cooled condenser, a liquid storage tank, an electronic expansion valve and a battery cooler, the electric compressor is fixedly connected with the water-cooled condenser through a pipeline, the water-cooled condenser is fixedly connected with the liquid storage tank through a pipeline, the liquid storage tank is fixedly connected with the battery cooler through a pipeline, and the electronic expansion valve is fixedly installed on the pipeline between the liquid storage tank and the battery cooler; a cooling water pump is connected between the battery cooler and the water cooling plate, and an eight-way valve is connected between the water cooling plate and the battery cooler.
The vehicle control unit HCU is connected with the electric compressor and the electronic expansion valve CAN bus, the cooling liquid passing through the battery water cooling plate exchanges heat with a refrigerant in the battery cooler and the water cooling condenser after passing through the eight-way valve, and the cooling liquid CAN circularly cool the water cooling plate by controlling the rotating speed of the electric compressor, so that the heat exchange is carried out when the battery pack is charged.
The control device 100 further comprises a transmitting unit 110 and a processing unit 120, each unit having the following functions:
the sending unit 110 is configured to send heat productivity information of a battery cell and heat exchange amount information of a water cooling plate in a battery pack when the battery pack is charged;
and the processing unit 120 is configured to receive the heat productivity information of the battery cell and the heat exchange amount information of the water cooling plate, and compare and determine the heat productivity information and the heat exchange amount information of the water cooling plate, so as to adjust a rotation speed of the electric compressor in the cooling loop, so that the rotation speed of the electric compressor can change along with a change of the heat exchange amount.
It is understood that the structure of the control device 100 shown in fig. 6 is only a schematic structure, and the control device 100 may further include more components than those shown in fig. 6. The components shown in fig. 6 may also be implemented in hardware, software, or a combination thereof.
It should be noted that, as will be clear to those skilled in the art, for convenience and brevity of description, the specific working process of the control device described above may refer to the corresponding process of each step in the foregoing method, and will not be described in detail herein.
The embodiment of the application also provides a computer readable storage medium. The computer-readable storage medium has stored therein a computer program that, when run on a computer, causes the computer to execute the charge-time battery pack thermal management control method as described in the above-described embodiments.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus, system, and method may be implemented in other ways. The apparatus, system, and method embodiments described above are illustrative only, as the flowcharts and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions. In addition, functional modules in the embodiments of the present application may be integrated together to form an independent part, or each module may exist alone, or two or more modules may be integrated to form an independent part.
The above description is only an example of the present application and is not intended to limit the scope of the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. The utility model provides a rechargeable battery package thermal management control method, its characterized in that, is applied to control system, control system includes control device and battery package management system, control device includes cooling circuit, water-cooling board and vehicle control unit, the battery module laminating of water-cooling board and battery package is arranged, cooling circuit and water-cooling board pipe connection, vehicle control unit and cooling circuit and water-cooling board communication connection, battery package management system and vehicle control unit communication connection, the method includes:
when the battery pack is charged, the battery pack management system acquires the heat productivity of a battery core in the battery pack, and the vehicle control unit acquires the heat exchange quantity of a water cooling plate;
and when the vehicle control unit receives the heating value information, comparing and judging the heating value information with the heat exchange quantity so as to adjust the working state of the cooling circuit.
2. The method for thermal management control of a rechargeable battery pack according to claim 1, further comprising:
when the battery pack management system obtains the heat productivity of the battery pack, the temperature sensor obtains the temperature of the battery cell in the battery pack, the temperature sensor compares the temperature with the temperature of the battery cell to obtain the highest temperature, the vehicle control unit obtains the SOC and the current of the battery pack, the SOC and the current form a charging map with the temperature of the battery cell, and the current value of the cooling loop in the cooling time period of the battery pack is predicted in an interpolation mode.
3. The method for thermal management control of a rechargeable battery pack according to claim 2, further comprising:
the vehicle control unit obtains a battery core internal resistance map formed by the battery core temperature, the SOC and the internal resistance value, interpolates the internal resistance value of the battery pack in the prediction time, and obtains the battery pack internal resistance value through a formula:
and calculating the heat productivity of the battery core within the interpolation prediction time.
4. The method for thermal management control of a rechargeable battery pack according to claim 1, further comprising:
and when the vehicle control unit obtains the heat exchange quantity of the water cooling plate, testing the maximum heat exchange power in the water cooling plate heat exchange power map through the cooling circuit, and calculating the maximum heat exchange quantity of the water cooling plate.
5. The thermal management control method for the rechargeable battery pack according to claim 1, wherein the cooling loop comprises an electric compressor, a water-cooled condenser, a liquid storage tank, an electronic expansion valve and a battery cooler, the electric compressor is connected with the water-cooled condenser through a pipeline, the water-cooled condenser is connected with the liquid storage tank through a pipeline, the liquid storage tank is connected with the battery cooler through a pipeline, and the electronic expansion valve is arranged on a pipeline between the liquid storage tank and the battery cooler;
and a cooling water pump is connected between the battery cooler and the water cooling plate, and an eight-way valve is connected between the water cooling plate and the battery cooler.
6. The method for controlling heat management of a rechargeable battery pack according to claim 5, wherein when the vehicle control unit obtains the heat exchange amount of the water cooling plate, the maximum heat exchange power in the heat exchange power map of the water cooling plate is tested and the maximum heat exchange amount of the water cooling plate is calculated by controlling the rotation speed of the electric compressor and the ratio of the high pressure and the low pressure at the inlet and the outlet of the electric compressor.
7. The method of claim 6, further comprising:
when the heating value and the heat exchange amount are compared and judged, if the heating value of the electric core is less than or equal to the maximum heat exchange amount in unit time, adjusting the rotating speed of the electric compressor to the rotating speed value when the heating value and the heat exchange amount are equal under the high-low pressure ratio of the inlet and the outlet of the compressor;
if the heating value of the electric core is larger than the maximum heat exchange amount in unit time, and the rotating speed value of the compressor is adjusted to the rotating speed value when the maximum heat exchange amount is reached under the high-low pressure ratio of the inlet and the outlet of the compressor at the moment.
8. The method for thermal management control of a rechargeable battery pack according to claim 1, further comprising:
when the heating value and the heat exchange quantity are compared and judged, according to a formula:
wherein, C bat Is the specific heat capacity of the cell, m bat And calculating the highest temperature of the battery cell at the end of unit time for the quality of the battery cell, and interpolating and predicting the current value of the electric compressor in the response battery pack cooling time period by using a charging map formed by the highest temperature of the battery cell, the SOC and the current by the vehicle control unit.
9. The utility model provides a rechargeable battery package thermal management controlling means, its characterized in that is applied to control system, control system includes controlgear and battery package management system, controlgear includes cooling circuit, water-cooling board and vehicle control unit, the laminating of battery module in water-cooling board and the battery package is arranged, cooling circuit and water-cooling board pipe connection, vehicle control unit and cooling circuit and water-cooling board communication connection, battery package management system and vehicle control unit communication connection, the device still includes:
the sending unit is used for sending heat productivity information of a battery core in the battery pack and heat exchange quantity information of the water cooling plate when the battery pack is charged;
and the processing unit is used for receiving the heating value information of the battery core and the heat exchange amount information of the water cooling plate, and comparing and judging the heating value information and the heat exchange amount information of the water cooling plate, so that the working state of the cooling loop is adjusted.
10. A computer-readable storage medium, in which a computer program is stored which, when run on a computer, causes the computer to carry out the method according to any one of claims 1-8.
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