CN114388929A - Cooling system and method for automobile power battery module - Google Patents
Cooling system and method for automobile power battery module Download PDFInfo
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- CN114388929A CN114388929A CN202111339490.4A CN202111339490A CN114388929A CN 114388929 A CN114388929 A CN 114388929A CN 202111339490 A CN202111339490 A CN 202111339490A CN 114388929 A CN114388929 A CN 114388929A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/613—Cooling or keeping cold
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
- H01M10/625—Vehicles
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/63—Control systems
- H01M10/637—Control systems characterised by the use of reversible temperature-sensitive devices, e.g. NTC, PTC or bimetal devices; characterised by control of the internal current flowing through the cells, e.g. by switching
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- 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 discloses a cooling system and a cooling method for an automobile power battery module, which comprise the following steps: the cooling system comprises a battery module, a plurality of temperature sensors, a vehicle-mounted ECU, a cooling liquid control module and a heat dissipation pipeline, wherein the battery module is composed of a plurality of batteries, the plurality of batteries are set as calibration batteries, the temperature sensors are connected with the calibration batteries to acquire the temperature of the calibration batteries, the temperature sensors are connected with the vehicle-mounted ECU to transmit the temperature information of the calibration batteries to the vehicle-mounted ECU, the vehicle-mounted ECU controls the cooling liquid control module to start cooling and finish working, and the vehicle-mounted ECU controls the cooling liquid control module to execute a cooling scheme after determining the cooling scheme according to the temperature difference. The system and the method provided by the invention realize a cooling scheme with variable temperature and variable time, reduce the temperature difference among the batteries in the battery module, improve the consistency of the batteries, prolong the service life of the batteries, increase the driving safety and effectively reduce the cost.
Description
Technical Field
The invention relates to the field of heat dissipation of automobile power battery modules, in particular to a cooling system and a cooling method for an automobile power battery module.
Background
The electric automobile has strong controllability, energy conservation and emission reduction, thereby being widely concerned and rapidly developed. However, the problems of heavy volume, low energy density and easy occurrence of thermal runaway of the battery pack become the main brake elbow for the development of the electric automobile. The optimal working temperature of the lithium ion battery is 20-40 ℃, and under the influence of factors such as external temperature, self-heating change and the like, the working temperature of the battery is often higher than an ideal state in practical situations. Among various studies on batteries, a battery thermal management system responsible for regulating the temperature of a battery is in a very special and important position. The cooling system guarantees safe and stable operation of the battery, and the cooling effect of the battery is closely related to the safety of the battery.
In the prior art, most of the existing cooling systems adopt a liquid cooling mode.
In the prior art, although a liquid cooling system has good heat dissipation performance, the traditional control strategy adopts a fixed target temperature of cooling liquid to cover all working conditions, which often causes cold shock of batteries, and in order to meet the consistency among battery monomers and the industry common value of less than 5 ℃ among the battery monomers, the flow direction and the distribution of the cooling liquid are often controlled by continuously improving the pipeline layout and the structure of a liquid cooling plate. However, the complicated cooling channel not only causes pressure loss of the cooling fluid, but also greatly increases the processing difficulty and cost. The existing patent focuses on the improvement of the cooling circuit in the aspect of battery heat dissipation, and little research is carried out on the cooling strategy and mode.
Disclosure of Invention
In order to solve the above problems, an object of the present invention is to provide a cooling system and method for an automotive power battery module. The purpose of the invention is realized by the following technical scheme.
In a first aspect the present invention provides a cooling system for an automotive power battery module, comprising: the battery module, a plurality of temperature sensor, on-vehicle ECU, coolant liquid control module and heat dissipation pipeline.
The heat dissipation pipeline surrounds the battery module, the battery module consists of a plurality of batteries, and a plurality of calibration batteries are selected from the plurality of batteries; the calibration batteries are connected with the temperature sensors in a one-to-one correspondence mode.
Each temperature sensor is used for measuring the real-time temperature of the corresponding calibration battery.
Each temperature sensor is connected with the vehicle-mounted ECU and used for transmitting the real-time temperature information of the corresponding calibration battery to the vehicle-mounted ECU.
The vehicle-mounted ECU is used for calculating a plurality of temperature differences of real-time temperatures of the plurality of calibration batteries and determining the maximum temperature difference in the plurality of temperature differences; and the vehicle-mounted ECU is used for controlling the cooling liquid control module to execute the cooling scheme with the determined temperature and the variable maintaining time length after determining the cooling scheme with the variable maintaining time length according to the maximum temperature difference.
The cooling liquid control module is used for controlling the cooling liquid to be output to the heat dissipation pipeline; the cooling liquid control module is used for reducing the temperature of the cooling liquid.
Optionally, the method further includes: and a temperature difference calculation module.
Each temperature sensor is connected with the temperature difference calculation module and used for transmitting the real-time temperature information of each calibration battery to the temperature difference calculation module.
The temperature difference calculation module calculates a plurality of temperature differences of the real-time temperatures of the plurality of calibration batteries.
The temperature difference calculation module is connected with the vehicle-mounted ECU and used for transmitting the temperature differences to the vehicle-mounted ECU.
Optionally, the cooling scheme with variable coolant temperature and maintenance duration comprises:
if the temperature difference is less than 3 ℃, the cooling scheme is that the temperature of the cooling liquid is maintained for 35-45 seconds at the current temperature, and the temperature of the cooling liquid is reduced by 5 ℃ after 35-45 seconds.
If the temperature difference is more than or equal to 3 ℃ and less than or equal to 4 ℃, the cooling scheme is that the cooling liquid is maintained at the current temperature for 55-65 seconds, and the temperature of the cooling liquid is reduced by 5 ℃ after 55-65 seconds.
If the temperature difference is more than 4 ℃, the cooling scheme is that the current temperature of the cooling liquid is maintained for 75-80 seconds, and the temperature of the cooling liquid is reduced by 5 ℃ after 75-85 seconds.
Optionally, the batteries in the battery module are divided into 3 rows, and 10 batteries in each row are regularly arranged in a rectangular shape.
The battery module is from bottom to top, from left to right, and the first battery, the sixth battery, the tenth battery of setting first row are for demarcating the battery, and the first battery, the tenth battery of second row are for demarcating the battery, and the first battery, the sixth battery, the tenth battery of third row are for demarcating the battery.
The heat dissipation pipeline sequentially passes through the lower part of the first row of batteries, the middle of the first row of batteries and the second row of batteries, the middle of the second row of batteries and the third row of batteries and the upper part of the third row of batteries in an S shape from the lower part of the first row of batteries of the battery module, and surrounds the plurality of batteries for dissipating heat of the plurality of batteries.
Optionally, high-heat-conduction heat dissipation silica gel is arranged between the battery module and the heat dissipation pipeline.
In a second aspect, the present invention further provides a method for cooling an automotive power battery module, which is operated on the cooling system for an automotive power battery module according to the first aspect, and includes the following steps:
step 1, a temperature sensor monitors calibration batteries in real time, and transmits temperature information of each calibration battery to a vehicle-mounted ECU; when the vehicle-mounted ECU detects that the temperature of any calibrated battery reaches 40 ℃, the vehicle-mounted ECU controls the cooling liquid control module to output cooling liquid to the heat dissipation pipeline, and the initial temperature of the cooling liquid is 35 ℃.
Step 2, the vehicle-mounted ECU calculates a plurality of temperature differences of real-time temperatures of the plurality of calibration batteries, determines the maximum temperature difference in the plurality of temperature differences, and obtains the maximum temperature difference delta T, wherein the calculation formula of the maximum temperature difference is as follows:
ΔT＝T1-T2
where T1 is the maximum temperature calibration battery temperature and T2 is the minimum temperature calibration battery temperature.
And 3, controlling a cooling liquid control module to execute a cooling scheme in real time by the vehicle-mounted ECU according to the maximum temperature difference delta T.
And if the maximum temperature difference delta T is less than 3 ℃, the cooling liquid control module controls the current temperature of the cooling liquid to be maintained for 35-45 seconds, and after 35-45 seconds, the cooling liquid control module controls the temperature of the cooling liquid to be reduced by 5 ℃.
If the maximum temperature difference delta T is more than or equal to 3 ℃ and the delta T is less than or equal to 4 ℃, the cooling liquid control module controls the cooling liquid to maintain the current temperature for 55-65 seconds, and after 55-65 seconds, the cooling liquid control module controls the temperature of the cooling liquid to be reduced by 5 ℃.
And if the maximum temperature difference delta T is greater than 4 ℃, the cooling liquid control module controls the current temperature of the cooling liquid to be maintained for 75-85 seconds, and after 75-85 seconds, the cooling liquid control module controls the temperature of the cooling liquid to be reduced by 5 ℃.
And 4, acquiring the temperature information of the plurality of calibration batteries in the battery module by the vehicle-mounted ECU, and calculating the average temperature of the plurality of calibration batteries.
And if the average temperature of the plurality of calibrated battery temperatures is more than or equal to 20 ℃, the vehicle-mounted ECU executes the step 3 again.
And if the average temperature of the plurality of calibrated battery temperatures is less than 20 ℃, the vehicle-mounted ECU controls the cooling liquid control module to finish cooling.
Optionally, the temperature sensor monitors the calibration cells in real time, and transmits temperature information of each calibration cell to the temperature difference calculation module.
The temperature difference calculation module calculates a plurality of temperature differences of real-time temperatures of the plurality of calibration batteries to obtain a plurality of temperature differences, and transmits the plurality of temperature differences to the vehicle-mounted ECU.
The invention has the beneficial effects that: the invention provides a system and a method for cooling an automobile power battery module, which are used for collecting temperature, calculating temperature difference, selecting a cooling scheme of the automobile power battery module with variable cooling liquid temperature and maintaining time according to the maximum temperature difference on the premise that a heat dissipation pipeline is not changed, and particularly can effectively reduce the temperature difference among single batteries in the battery module, improve the consistency of the batteries, prolong the service life of the batteries, increase the driving safety and effectively reduce the cost under the high-temperature high-rate operation state of the automobile power battery module.
Drawings
Fig. 1 is a schematic frame diagram of a cooling system for an automotive power battery module according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a frame of another cooling system for a power battery module of an automobile according to an embodiment of the present invention
Fig. 3 is a schematic diagram of a cooling scheme in a cooling system for an automotive power battery module according to an embodiment of the present invention;
fig. 4 is a schematic layout diagram of a battery module in a cooling system for a power battery module of an automobile according to an embodiment of the present invention;
fig. 5 is a flowchart of a cooling method for an automotive power battery module according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As described below with reference to the accompanying drawings, as shown in fig. 1, an embodiment of the present invention provides a cooling system for an automotive power battery module, including: the battery module, a plurality of temperature sensor, on-vehicle ECU (electronic Control unit), coolant liquid Control module and heat dissipation pipeline.
The heat dissipation pipeline surrounds the battery module, the battery module consists of a plurality of batteries, and a plurality of calibration batteries are selected from the plurality of batteries; the calibration batteries are connected with the temperature sensors in a one-to-one correspondence mode.
Each temperature sensor is used for measuring the real-time temperature of the corresponding calibration battery.
The heat dissipation pipeline surrounds a plurality of batteries of the battery module, the battery module is composed of a plurality of single batteries, a plurality of single batteries are selected from the single batteries, the selected single batteries are determined to be calibration batteries, the number of the calibration batteries is larger than two, and the number of the calibration batteries is not more than the number of the single batteries. The temperature sensor is connected with the calibration battery and used for acquiring temperature information of the calibration battery, and if the single battery is a square battery, the surface center of the square battery is selected as a temperature measuring point for convenience of acquisition and calculation; and if the single battery is a cylindrical battery, selecting the upper surface of the cylindrical battery as a temperature measuring point.
Each temperature sensor is connected with the vehicle-mounted ECU and used for transmitting the real-time temperature information of the corresponding calibration battery to the vehicle-mounted ECU.
The temperature control module is connected with the vehicle-mounted ECU and transmits the acquired real-time temperatures of all the calibration batteries to the vehicle-mounted ECU.
And the vehicle-mounted ECU is used for controlling the cooling liquid control module to start and finish cooling work according to the real-time temperatures of the plurality of calibrated batteries.
The vehicle-mounted ECU is used for calculating a plurality of temperature differences of real-time temperatures of the plurality of calibration batteries and determining the maximum temperature difference in the plurality of temperature differences; and the vehicle-mounted ECU is used for controlling the cooling liquid control module to execute the cooling scheme with the determined temperature and the variable maintaining time length after determining the cooling scheme with the variable maintaining time length according to the maximum temperature difference.
The vehicle-mounted ECU is connected with the cooling liquid control module, detects the transmitted temperature information of the calibration batteries, and controls the cooling liquid control module to start working when detecting that the temperature information of any one calibration battery reaches 40 ℃; the vehicle-mounted ECU calculates a plurality of temperature differences of the calibration battery, determines the maximum temperature difference of the temperature differences, determines a cooling scheme to be executed according to the maximum temperature difference, and controls the cooling liquid control module to execute a corresponding cooling scheme according to the determined cooling scheme.
The cooling liquid control module is used for controlling the cooling liquid to be output to the heat dissipation pipeline; the cooling liquid control module is used for reducing the temperature of the cooling liquid.
The cooling liquid control module controls the cooling liquid to be output to the heat dissipation pipeline, and the cooling liquid control module is used for reducing the temperature of the cooling liquid.
According to the cooling system for the automobile power battery module, provided by the embodiment of the invention, the real-time temperature information of the calibrated battery in the battery module is monitored, the vehicle-mounted ECU determines the cooling scheme through temperature change, the cooling liquid control module is controlled to cool the battery module, and the proper cooling scheme is selected through the temperature difference between the batteries in the battery module, so that the temperature difference between the battery monomers in the battery pack is effectively reduced, the consistency of the batteries is improved, the service life of the batteries is prolonged, the driving safety is increased, and the cost is effectively reduced.
On the basis of the above embodiment of the present invention, an embodiment of the present invention further provides a cooling system for an automobile power battery module, which is described below with reference to the accompanying drawings, as shown in fig. 2, and the embodiment of the present invention further provides a cooling system for an automobile power battery module, further including: and a temperature difference calculation module.
Each temperature sensor is connected with the temperature difference calculation module and used for transmitting the real-time temperature information of each calibration battery to the temperature difference calculation module.
The temperature control module is connected with the temperature difference calculation module and used for transmitting the temperature information of the calibration battery acquired in real time to the temperature difference calculation module.
The temperature difference calculation module calculates a plurality of temperature differences of the real-time temperatures of the plurality of calibration batteries.
The temperature difference calculation module calculates a plurality of temperature differences of the plurality of calibration batteries according to the temperature information of the calibration batteries.
The temperature difference calculation module is connected with the vehicle-mounted ECU and used for transmitting the temperature differences to the vehicle-mounted ECU.
The temperature difference calculation module is connected with the vehicle-mounted ECU, calculates a plurality of temperature differences of the plurality of calibration batteries according to the temperature information of the calibration batteries, and transmits the plurality of temperature differences to the vehicle-mounted ECU.
According to the cooling system for the automobile power battery module, the temperature difference calculation module replaces the vehicle-mounted ECU to calculate the temperature difference, the work of the vehicle-mounted ECU is reduced, and the cooling module can be controlled to dissipate heat more accurately when the vehicle-mounted ECU works.
On the basis of the above embodiment, the present invention further provides a cooling scheme for a cooling system of an automobile power battery module, as described below with reference to the accompanying drawings, as shown in fig. 3, the cooling scheme for a cooling system of an automobile power battery module, in which the temperature and the duration of the cooling solution are variable, and the cooling scheme comprises:
if the maximum temperature difference is less than 3 ℃, the cooling scheme is that the temperature of the cooling liquid is maintained for 35-45 seconds at the current temperature, and the temperature of the cooling liquid is reduced by 5 ℃ after 35-45 seconds.
And the vehicle-mounted ECU determines a specific cooling scheme to be executed next according to the maximum temperature difference, if the maximum temperature difference is less than 3 ℃, the cooling scheme is that the temperature of the cooling liquid is maintained for 35-45 seconds at the current temperature, and the temperature of the cooling liquid is reduced by 5 ℃ after 35-45 seconds.
If the maximum temperature difference is more than or equal to 3 ℃ and less than or equal to 4 ℃, the cooling scheme is that the cooling liquid is maintained at the current temperature for 55-65 seconds, and the temperature of the cooling liquid is reduced by 5 ℃ after 55-65 seconds.
And the vehicle-mounted ECU determines a specific cooling scheme to be executed next through the maximum temperature difference, and if the maximum temperature difference is greater than or equal to 3 ℃ and less than or equal to 4 ℃, the cooling scheme is that the cooling liquid is maintained at the current temperature for 55-65 seconds, and the temperature of the cooling liquid is reduced by 5 ℃ after 55-65 seconds.
If the maximum temperature difference is more than 4 ℃, the cooling scheme is that the current temperature of the cooling liquid is maintained for 75-80 seconds, and the temperature of the cooling liquid is reduced by 5 ℃ after 75-85 seconds.
And the vehicle-mounted ECU determines a specific cooling scheme to be executed next according to the maximum temperature difference, if the maximum temperature difference is larger than 4 ℃, the cooling scheme is that the current temperature of the cooling liquid is maintained for 75-80 seconds, and the temperature of the cooling liquid is reduced by 5 ℃ after 75-85 seconds.
According to the cooling system for the automobile power battery module, the corresponding cooling scheme is selected for heat dissipation according to different maximum temperature differences, so that the temperature difference among battery monomers in the battery pack is effectively reduced, the consistency of batteries is improved, the service life of the batteries is prolonged, the driving safety is improved, and the cost is effectively reduced.
On the basis of the above embodiment of the present invention, the present invention further provides a layout of battery modules in a cooling system for an automotive power battery module, as will be described below with reference to the accompanying drawings, as shown in fig. 4, the cooling system for an automotive power battery module is provided, wherein the batteries in the battery modules are divided into 3 rows, and 10 batteries in each row are arranged in a rectangular shape.
The battery modules are arranged in a 3X10 format and are divided into 3 rows, and each row contains 10 single batteries.
The battery module is from bottom to top, from left to right, and the first battery, the sixth battery, the tenth battery of setting first row are for demarcating the battery, and the first battery, the tenth battery of second row are for demarcating the battery, and the first battery, the sixth battery, the tenth battery of third row are for demarcating the battery.
The heat dissipation pipeline sequentially passes through the lower part of the first row of batteries, the middle of the first row of batteries and the second row of batteries, the middle of the second row of batteries and the third row of batteries and the upper part of the third row of batteries in an S shape from the lower part of the first row of batteries of the battery module, and surrounds the plurality of batteries for dissipating heat of the plurality of batteries.
High heat conduction heat dissipation silica gel has between battery module and the heat dissipation pipeline.
For good heat dissipation, increase battery module's heat radiating area, it has high heat conduction heat dissipation silica gel to fill in battery and the heat dissipation pipeline.
The radiating pipelines are surrounded on two sides of the single batteries in an S shape and used for radiating heat for the single batteries simultaneously.
According to the layout of the battery module in the cooling system for the automobile power battery module, provided by the embodiment of the invention, as the temperature difference between the single batteries at the inlet and the outlet of the cooling liquid and the corner of the heat dissipation pipeline is larger, a plurality of calibration batteries are selected and are separated by a certain distance, so that a plurality of temperatures of the single batteries are obtained as far as possible, and the reliability of the system in operation is ensured to the maximum extent.
An embodiment of the present invention further provides a method for cooling an automotive power battery module, which is described below with reference to the accompanying drawings, and as shown in fig. 5, the embodiment of the present invention further provides a method for cooling an automotive power battery module, which is operated on the cooling system for an automotive power battery module according to claim 1, and includes the following steps:
step 1, a temperature sensor monitors calibration batteries in real time, and transmits temperature information of each calibration battery to a vehicle-mounted ECU; when the vehicle-mounted ECU detects that the temperature of any calibrated battery reaches 40 ℃, the vehicle-mounted ECU controls the cooling liquid control module to output cooling liquid to the heat dissipation pipeline, and the initial temperature of the cooling liquid is 35 ℃.
Step 2, the vehicle-mounted ECU calculates a plurality of temperature differences of real-time temperatures of the plurality of calibration batteries, determines the maximum temperature difference in the plurality of temperature differences, and obtains the maximum temperature difference delta T, wherein the calculation formula of the maximum temperature difference is as follows:
ΔT＝T1-T2
where T1 is the maximum temperature calibration battery temperature and T2 is the minimum temperature calibration battery temperature.
And 3, controlling a cooling liquid control module to execute a cooling scheme in real time by the vehicle-mounted ECU according to the maximum temperature difference delta T.
And if the maximum temperature difference delta T is less than 3 ℃, the cooling liquid control module controls the current temperature of the cooling liquid to be maintained for 35-45 seconds, and after 35-45 seconds, the cooling liquid control module controls the temperature of the cooling liquid to be reduced by 5 ℃.
If the maximum temperature difference delta T is more than or equal to 3 ℃ and the delta T is less than or equal to 4 ℃, the cooling liquid control module controls the cooling liquid to maintain the current temperature for 55-65 seconds, and after 55-65 seconds, the cooling liquid control module controls the temperature of the cooling liquid to be reduced by 5 ℃.
And if the maximum temperature difference delta T is greater than 4 ℃, the cooling liquid control module controls the current temperature of the cooling liquid to be maintained for 75-85 seconds, and after 75-85 seconds, the cooling liquid control module controls the temperature of the cooling liquid to be reduced by 5 ℃.
And 4, acquiring the temperature information of the plurality of calibration batteries in the battery module by the vehicle-mounted ECU, and calculating the average temperature of the plurality of calibration batteries.
And if the average temperature of the plurality of calibrated battery temperatures is more than or equal to 20 ℃, the vehicle-mounted ECU executes the step 3 again.
And if the average temperature of the plurality of calibrated battery temperatures is less than 20 ℃, the vehicle-mounted ECU controls the cooling liquid control module to finish cooling.
The temperature sensor monitors the calibration batteries in real time, and transmits the temperature information of each calibration battery to the temperature difference calculation module.
The temperature difference calculation module calculates a plurality of temperature differences of real-time temperatures of the plurality of calibration batteries to obtain a plurality of temperature differences, and transmits the plurality of temperature differences to the vehicle-mounted ECU.
According to the cooling method for the power battery of the electric automobile, the vehicle-mounted ECU controls the cooling liquid control module to work according to the real-time temperature information of the calibrated battery, and the temperature and the maintaining time of the cooling liquid are changed, so that the temperature difference among battery monomers in the battery pack can be effectively reduced, the consistency of the battery is improved, the service life of the battery is prolonged, the driving safety is improved, and the cost is effectively reduced under the condition that the automobile battery runs at high temperature and high multiplying power. On current electric automobile battery cooling pipeline basis, compare in traditional cooling method, under the unchangeable prerequisite of structure, need not increase extra structure, only need with the control algorithm strategy embedding to above-mentioned on-vehicle ECU, can realize the promotion of cooling performance, satisfy the requirement of battery uniformity.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (7)
1. A cooling system for an automotive power battery module, comprising: the system comprises a battery module, a plurality of temperature sensors, a vehicle-mounted ECU, a cooling liquid control module and a heat dissipation pipeline;
the heat dissipation pipeline surrounds the battery module, the battery module consists of a plurality of batteries, and a plurality of calibration batteries are selected from the plurality of batteries; the calibration batteries are connected with the temperature sensors in a one-to-one correspondence manner;
each temperature sensor is used for measuring the real-time temperature of the corresponding calibration battery;
each temperature sensor is connected with the vehicle-mounted ECU and used for transmitting the real-time temperature information of the corresponding calibration battery to the vehicle-mounted ECU;
the vehicle-mounted ECU is used for calculating a plurality of temperature differences of real-time temperatures of the plurality of calibration batteries and determining the maximum temperature difference in the plurality of temperature differences; the vehicle-mounted ECU is used for controlling the cooling liquid control module to execute the cooling scheme with the determined variable cooling liquid temperature and the variable maintaining time after determining the cooling scheme with the variable cooling liquid temperature and the variable maintaining time according to the maximum temperature difference;
the cooling liquid control module is used for controlling the cooling liquid to be output to the heat dissipation pipeline; the cooling liquid control module is used for reducing the temperature of the cooling liquid.
2. The cooling system for an automotive power battery module according to claim 1, characterized by further comprising: a temperature difference calculation module;
each temperature sensor is connected with the temperature difference calculation module and used for transmitting the real-time temperature information of each calibration battery to the temperature difference calculation module;
the temperature difference calculation module is used for calculating a plurality of temperature differences of the real-time temperatures of the calibration batteries;
the temperature difference calculation module is connected with the vehicle-mounted ECU and used for transmitting the temperature differences to the vehicle-mounted ECU.
3. The cooling system for an automotive power battery module according to claim 1, characterized in that a cooling scheme with variable coolant temperature and maintenance duration comprises:
if the temperature difference is less than 3 ℃, the cooling scheme is that the temperature of the cooling liquid is maintained for 35-45 seconds at the current temperature, and the temperature of the cooling liquid is reduced by 5 ℃ after 35-45 seconds;
if the temperature difference is more than or equal to 3 ℃ and less than or equal to 4 ℃, the cooling scheme is that the cooling liquid is maintained at the current temperature for 55-65 seconds, and the temperature of the cooling liquid is reduced by 5 ℃ after 55-65 seconds;
if the temperature difference is more than 4 ℃, the cooling scheme is that the current temperature of the cooling liquid is maintained for 75-80 seconds, and the temperature of the cooling liquid is reduced by 5 ℃ after 75-85 seconds.
4. The cooling system for a power battery module of an automobile according to claim 1, wherein the batteries in the battery module are divided into 3 rows of 10 batteries, each row being arranged in a rectangular shape;
the battery module is provided with a first battery, a sixth battery and a tenth battery in a first row as calibration batteries, a first battery and a tenth battery in a second row as calibration batteries, and a first battery, a sixth battery and a tenth battery in a third row as calibration batteries from bottom to top and from left to right;
the heat dissipation pipeline sequentially passes through the lower part of the first row of batteries, the middle of the first row of batteries and the second row of batteries, the middle of the second row of batteries and the third row of batteries and the upper part of the third row of batteries in an S shape from the lower part of the first row of batteries of the battery module, and surrounds the plurality of batteries for dissipating heat of the plurality of batteries.
5. The cooling system for the automobile power battery module as claimed in claim 4, wherein a high thermal conductivity heat dissipation silica gel is provided between the battery module and the heat dissipation pipe.
6. A method for cooling an automotive power battery module, operating on the cooling system for an automotive power battery module of claim 1, comprising the steps of:
step 1, a temperature sensor monitors calibration batteries in real time, and transmits temperature information of each calibration battery to a vehicle-mounted ECU; when the vehicle-mounted ECU detects that the temperature of any calibrated battery reaches 40 ℃, the vehicle-mounted ECU controls the cooling liquid control module to output cooling liquid to the heat dissipation pipeline, and the initial temperature of the cooling liquid is 35 ℃;
step 2, the vehicle-mounted ECU calculates a plurality of temperature differences of real-time temperatures of the plurality of calibration batteries, determines the maximum temperature difference in the plurality of temperature differences, and obtains the maximum temperature difference delta T, wherein the calculation formula of the maximum temperature difference is as follows:
ΔT＝T1-T2
wherein T1 is the maximum temperature calibration battery temperature, and T2 is the minimum temperature calibration battery temperature;
step 3, the vehicle-mounted ECU controls the cooling liquid control module to execute a cooling scheme in real time according to the maximum temperature difference delta T;
if the maximum temperature difference delta T is less than 3 ℃, the cooling liquid control module controls the current temperature of the cooling liquid to be maintained for 35-45 seconds, and after 35-45 seconds, the cooling liquid control module controls the temperature of the cooling liquid to be reduced by 5 ℃;
if the maximum temperature difference delta T is more than or equal to 3 ℃ and the delta T is less than or equal to 4 ℃, the cooling liquid control module controls the cooling liquid to maintain the current temperature for 55-65 seconds, and after 55-65 seconds, the cooling liquid control module controls the temperature of the cooling liquid to be reduced by 5 ℃;
if the maximum temperature difference delta T is greater than 4 ℃, the cooling liquid control module controls the current temperature of the cooling liquid to be maintained for 75-85 seconds, and after 75-85 seconds, the cooling liquid control module controls the temperature of the cooling liquid to be reduced by 5 ℃;
step 4, the vehicle-mounted ECU acquires the temperature information of a plurality of calibration batteries in the battery module, and calculates the average temperature of the temperatures of the plurality of calibration batteries;
if the average temperature of the plurality of calibrated battery temperatures is more than or equal to 20 ℃, the vehicle-mounted ECU executes the step 3 again;
and if the average temperature of the plurality of calibrated battery temperatures is less than 20 ℃, the vehicle-mounted ECU controls the cooling liquid control module to finish cooling.
7. The method for cooling the automobile power battery module according to claim 6, wherein the temperature sensor monitors the calibration batteries in real time, and transmits temperature information of each calibration battery to the temperature difference calculation module;
the temperature difference calculation module calculates a plurality of temperature differences of real-time temperatures of the plurality of calibration batteries to obtain a plurality of temperature differences, and transmits the plurality of temperature differences to the vehicle-mounted ECU.
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