CN113707968A - Multi-branch high-voltage battery system and temperature difference control method and device thereof - Google Patents
Multi-branch high-voltage battery system and temperature difference control method and device thereof Download PDFInfo
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- CN113707968A CN113707968A CN202111268279.8A CN202111268279A CN113707968A CN 113707968 A CN113707968 A CN 113707968A CN 202111268279 A CN202111268279 A CN 202111268279A CN 113707968 A CN113707968 A CN 113707968A
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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
- H01M10/633—Control systems characterised by algorithms, flow charts, software details or the like
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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
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/486—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring temperature
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—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
- H01M10/61—Types of temperature control
- H01M10/617—Types of temperature control for achieving uniformity or desired distribution of temperature
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/62—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
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/655—Solid structures for heat exchange or heat conduction
- H01M10/6556—Solid parts with flow channel passages or pipes for heat exchange
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- H—ELECTRICITY
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
- H01M10/6567—Liquids
- H01M10/6568—Liquids characterised by flow circuits, e.g. loops, located externally to the cells or cell casings
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Abstract
The invention relates to the technical field of battery correlation, and provides a multi-branch high-voltage battery system and a temperature difference control method and device thereof. The temperature difference control method of the multi-branch high-voltage battery system comprises the following steps: acquiring the temperature of each battery branch and the operating state of a temperature control system; controlling the working state of each branch pump based on the temperature of the battery branches and the operating state of the temperature control system so that the temperature difference between the temperatures of the battery branches does not exceed a preset value; the pipeline in the temperature control system comprises a main pipeline and a branch pipeline; the branch pipelines correspond to the battery branches one by one, and the branch pumps are used for controlling the flow of the cooling liquid passing through each branch pipeline. So, based on the actual difference in temperature of each battery branch road, adjust the coolant flow of each branch road pipeline for the difference in temperature between each battery branch road is in within the allowed scope, makes the discharge current of each branch road approximately the same, improves the uniformity of system, avoids influencing the use of many branch roads high voltage battery system because of the branch road difference in temperature is too big.
Description
Technical Field
The invention relates to the technical field of battery correlation, in particular to a multi-branch high-voltage battery system and a temperature difference control method and device thereof.
Background
In the field of heavy engineering machinery (such as electric heavy trucks) and buses, in order to achieve a high voltage and high electric quantity state, a plurality of battery packs are connected in series and in parallel, for example, the battery packs are connected in series, and then the battery packs connected in series are connected in parallel with other batteries to form a whole set of high-voltage system. This constitutes a battery pack system with several branches.
The battery pack has certain requirements on the operating temperature, so that a temperature control system is required to be equipped for the multi-branch high-voltage battery system.
The existing temperature control system mostly adopts cooling liquid as a medium to control the temperature, in the practical use, a plurality of branches share one liquid inlet, and because the service conditions of all battery branches of the multi-branch high-voltage battery system have differences in the heat dissipation condition, under the temperature control mode, the temperature difference of the branches can be too large, and the temperature difference can reach about 10 ℃. This situation may cause different discharging currents of each branch, and the system consistency is deteriorated, which affects the use of the multi-branch high-voltage battery system.
Disclosure of Invention
The invention provides a multi-branch high-voltage battery system and a temperature difference control method and device thereof, which are used for solving the defects that the use of the multi-branch high-voltage battery system is influenced by different discharging currents of all branches and poor system consistency caused by overlarge temperature difference of the branches in the prior art.
The invention provides a multi-branch high-voltage battery system and a temperature difference control method thereof, wherein the temperature difference control method comprises the following steps:
acquiring the temperature of each battery branch and the operating state of a temperature control system;
controlling the working state of each branch pump based on the temperature of the battery branches and the operating state of the temperature control system so that the temperature difference between the temperatures of the battery branches does not exceed a preset value;
wherein the temperature control system comprises a branch conduit; the branch pipelines correspond to the battery branches one by one and are used for conveying cooling liquid to each battery branch;
the branch pumps are used for controlling the flow of the cooling liquid passing through each branch pipeline.
According to the multi-branch high-voltage battery system and the temperature difference control method thereof provided by the invention, the running state of the temperature control system comprises a standby state and a working state;
based on battery branch road temperature with temperature control system running state, control each branch road pump operating condition, include:
judging whether the running state of the temperature control system is a standby state or a working state;
when the running state of the temperature control system is a standby state, controlling a main pump of the temperature control system to work, and controlling the working state of each branch pump based on the temperature of each battery branch so that the temperature difference between the temperatures of each battery branch does not exceed a preset value;
and when the running state of the temperature control system is a working state, controlling the working state of each branch pump based on the temperature of the battery branches and the running mode of the temperature control system so as to enable the temperature difference between the temperatures of the battery branches not to exceed a preset value.
Preferably, the controlling the working state of each branch pump based on the branch temperature of the battery comprises:
calculating the average temperature of the temperature of each battery branch;
calculating the absolute value of the difference value between the temperature of each battery branch and the average temperature;
and adjusting the working state of each branch pump to ensure that the flow of each branch pump is positively correlated with the absolute value of the corresponding difference.
Preferably, the controlling the operating state of each branch pump based on the battery branch temperature and the operating mode of the temperature control system includes:
calculating the average temperature of the temperature of each battery branch;
respectively judging whether the temperature of each battery branch is greater than the average temperature to obtain a first judgment result;
respectively judging whether the temperature of each battery branch is smaller than the average temperature to obtain a second judgment result;
and adjusting the working state of each branch pump based on the first judgment result, the second judgment result and the operation mode of the temperature control system, so that the temperature difference between the temperatures of the battery branches does not exceed a preset value.
Preferably, the temperature control system operation modes include: a heating mode and a cooling mode;
adjusting the working state of each branch pump based on the first determination result, the second determination result and the operation mode of the temperature control system includes:
determining whether the operation mode of the temperature control system is a heating mode or a cooling mode is a heating mode and a cooling mode;
when the operation mode of the temperature control system is a refrigeration mode, increasing the flow of the first target branch pump by a preset flow, and reducing the flow of the second target branch pump by the preset flow;
when the operation mode of the temperature control system is a heating mode, reducing the flow of the first target branch pump by a preset flow, and increasing the flow of the second target branch pump by the preset flow;
the first target branch pump is a branch pump with a corresponding first judgment result of yes; the second target branch pump is a corresponding branch pump with a second judgment result of yes.
Preferably, the acquiring the temperature of each battery branch and the operating state of the temperature control system comprises:
acquiring the temperature of each battery branch through a plurality of preset temperature sensors;
and acquiring the running state of the temperature control system through communication connection with the temperature control system.
The invention provides a multi-branch high-voltage battery system, comprising: the system comprises a plurality of battery branches, a temperature control system and a temperature difference adjusting system;
the temperature control system includes: the system comprises a main pump, a cooling liquid temperature adjusting device and a pipeline; the pipelines comprise a main pipeline and a branch pipeline; the branch pipelines correspond to the battery branches one by one and are used for conveying cooling liquid to each battery branch;
the temperature difference adjusting system comprises a controller, a plurality of sensors and a plurality of branch pumps; the sensor is used for acquiring the temperature of each battery branch; the branch pumps are correspondingly arranged in the branch pipelines one by one and used for controlling the flow of each branch pipeline; the controller is respectively in communication connection with the temperature control system, the sensors and the branch pumps, and is used for executing the temperature difference control method of the multi-branch high-voltage battery system provided by the embodiment of the invention.
The invention provides a control device of a multi-branch high-voltage battery system, which comprises:
the acquisition unit is used for acquiring the temperature of each battery branch and the operating state of the temperature control system;
the control unit is used for controlling the working state of each branch pump based on the temperature of the battery branches and the running state of the temperature control system so as to enable the temperature difference between the temperatures of the battery branches not to exceed a preset value;
wherein the temperature control system comprises a branch conduit; the branch pipelines correspond to the battery branches one by one and are used for conveying cooling liquid to each battery branch;
the branch pumps are used for controlling the flow of the cooling liquid passing through each branch pipeline.
The invention also provides an electronic device, which comprises a memory, a processor and a computer program which is stored on the memory and can run on the processor, wherein the processor executes the program to realize the steps of any one of the multi-branch high-voltage battery system and the temperature difference control method thereof.
The present invention also provides a non-transitory computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the multi-branch high-voltage battery system and the temperature difference control method thereof as any one of the above.
The present invention also provides a vehicle comprising: a vehicle main body and a multi-branch high-voltage battery system;
the multi-branch high-voltage battery system performs any one of the above-described multi-branch high-voltage battery systems and temperature difference control methods thereof.
The invention provides a multi-branch high-voltage battery system and a temperature difference control method thereof and a temperature difference control method of the multi-branch high-voltage battery system in a device, wherein the temperature of each battery branch and the running state of the temperature control system are firstly obtained; then controlling the working state of each branch pump based on the temperature of the battery branches and the running state of the temperature control system, so that the temperature difference between the temperatures of the battery branches does not exceed a preset value; and controlling the flow of the cooling liquid passing through each branch pipeline by the branch pump. So based on the actual difference in temperature of each battery branch road, adjust the coolant flow of each branch road pipeline, the temperature of each battery branch road of adjustment of pertinence for the difference in temperature between each battery branch road is in within the allowed scope, makes the discharge current of each branch road approximately the same, improves the uniformity of system, avoids influencing the use of many branch road high voltage battery systems because of the branch road difference in temperature is too big.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic flow chart of a temperature difference control method for a multi-branch high-voltage battery system according to the present invention;
FIG. 2 is a second schematic flow chart of the temperature difference control method for the multi-branch high-voltage battery system according to the present invention;
FIG. 3 is a third schematic flow chart of the temperature difference control method for the multi-branch high-voltage battery system according to the present invention;
FIG. 4 is a fourth schematic flow chart of the temperature difference control method for the multi-branch high-voltage battery system according to the present invention;
FIG. 5 is a fifth flowchart of the temperature difference control method for the multi-branch high-voltage battery system according to the present invention;
fig. 6 is a schematic structural view of a multi-branch high-voltage battery system provided by the present invention;
fig. 7 is a schematic structural view of a multi-branch high-voltage battery system control device provided by the present invention;
fig. 8 is a schematic structural diagram of an electronic device provided in the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. 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.
In the field of heavy engineering machinery (such as electric heavy trucks) and buses, in order to achieve a high voltage and high electric quantity state, a plurality of battery packs are connected in series and in parallel, for example, the battery packs are connected in series, and then the battery packs connected in series are connected in parallel with other batteries to form a whole set of high-voltage system. This constitutes a battery pack system with several branches. However, the battery pack has certain requirements on the operating temperature, so that a temperature control system needs to be equipped for the multi-branch high-voltage battery system. The existing temperature control system mostly adopts cooling liquid as a medium to control the temperature, in the practical use, a plurality of branches share one liquid inlet, and because the service conditions of all battery branches of the multi-branch high-voltage battery system have differences in the heat dissipation condition, under the temperature control mode, the temperature difference of the branches can be too large, and the temperature difference can reach about 10 ℃. This situation may cause different discharging currents of each branch, and the system consistency is deteriorated, which affects the use of the multi-branch high-voltage battery system. To solve the above problems at least to some extent, embodiments of the present invention provide a multi-branch high-voltage battery system, and a temperature difference control method and device thereof. The multi-branch high-voltage battery system and the temperature difference control method and apparatus thereof according to the present invention will be described with reference to fig. 1 to 7.
Fig. 1 is a schematic flow diagram of a temperature difference control method for a multi-branch high-voltage battery system provided by the present invention, and referring to fig. 1, the temperature difference control method for a multi-branch high-voltage battery system provided by an embodiment of the present invention includes:
specifically, the temperature of each battery branch is obtained through a plurality of preset temperature sensors; and receiving the running state information sent by the temperature control system through the communication connection with the temperature control system so as to acquire the running state of the temperature control system.
102, controlling the working state of each branch pump based on the temperature of the battery branches and the running state of the temperature control system so that the temperature difference between the temperatures of the battery branches does not exceed a preset value;
wherein the temperature control system comprises: the system comprises a main pump, a cooling liquid temperature adjusting device and a pipeline; the pipelines comprise a main pipeline and a branch pipeline; the branch pipelines correspond to the battery branches one by one and are used for conveying cooling liquid to each battery branch; the branch pumps are used for controlling the flow of the cooling liquid passing through each branch pipeline.
In the scheme provided by the embodiment of the invention, the flow of the cooling liquid of each branch pipeline can be adjusted based on the actual temperature difference of each battery branch, and the temperature of each battery branch can be adjusted in a targeted manner, so that the temperature difference between each battery branch is within an allowable range, the discharging currents of each branch are approximately the same, the consistency of the system is improved, and the influence on the use of a multi-branch high-voltage battery system due to overlarge temperature difference of the branch is avoided.
It should be noted that the scheme provided by the embodiment of the present invention is an improvement based on the existing temperature control system, and in the specific implementation of the temperature difference control, a large number of devices in the temperature control system are used, so that the specific operating state of the temperature control system plays an important role in the scheme provided by the embodiment of the present invention.
The running state of the temperature control system can be simply divided into a standby state and a working state;
when the overall temperature of the battery is higher than the first preset temperature or lower than the second preset temperature, the temperature control system starts to work and is in a working state, and at the moment, a main pump of the temperature control system and the coolant temperature adjusting device both start to work.
When the overall temperature of the battery is between a first preset temperature and a second preset temperature, the temperature control system starts to stop working, and is in a standby state, and at the moment, a main pump of the temperature control system and the coolant temperature adjusting device stop working.
Specifically, in the solution provided in the embodiment of the present invention, in step 102, the step of controlling the operating state of each branch pump based on the temperature of the battery branch and the operating state of the temperature control system includes, with reference to fig. 2:
and 203, when the operation state of the temperature control system is the working state, controlling the working state of each branch pump based on the temperature of each battery branch and the operation mode of the temperature control system so that the temperature difference between the temperatures of each battery branch does not exceed a preset value.
According to the arrangement, different control strategies can be adopted based on different states of the temperature control system, and the working state of each branch pump can be flexibly adjusted, so that the temperature difference between the branch temperatures of the batteries is not more than a preset value.
Specifically, referring to fig. 3, in step 202, the controlling the operating state of each branch pump based on the battery branch temperature includes:
Specifically, for example, the number of the battery branches is 4, and the branch temperature of the battery branch a is 25 ℃; the branch temperature of the battery branch B is 29 ℃; the branch temperature of the battery branch C is 31 ℃; the branch temperature of the battery branch D is 35 ℃.
An average temperature of 30 degrees celsius may be obtained based on step 301. Based on step 302, it can be obtained that the absolute value of the temperature difference corresponding to the battery branch a is 5; the absolute value of the temperature difference corresponding to the battery branch B is 1; the absolute value of the temperature difference corresponding to the battery branch C is 1; the absolute value of the temperature difference corresponding to the battery branch D is 5. At this time, based on step 303, the flow rate of the branch pump corresponding to the battery branch a is: the flow rate of the branch pump corresponding to the battery branch B is as follows: the flow rate of the branch pump corresponding to the battery branch C is as follows: the flow rate of the branch pump corresponding to the battery branch D is 5:1:1: 5.
When the temperature control system is in the standby state, the temperature of the coolant serving as a medium for temperature transmission changes based on the temperature of the battery, and the temperature of the coolant flowing into the battery branch can be approximated to the average temperature of the battery. At this time, if the temperature difference needs to be controlled, the heat exchange is more needed in the region with the larger temperature difference from the average temperature, so the embodiment of the present invention adopts the scheme in step 303, that is, the flow rate of the corresponding cooling liquid pump is larger as the temperature difference from the average temperature is larger. In the above embodiment, the branch pump flow rate of the battery branch a and the branch pump flow rate of the battery branch D, which need to perform a large amount of heat exchange, are maximum and are 5 times that of the battery branch B and the battery branch C.
It should be noted that, in the above-mentioned adjustment process, it is necessary to always ensure that the sum of the flow rates of the branch pumps is not less than the flow rate of the main pump. Preferably, the sum of the flow rates of the branch pumps is approximately equal to the flow rate of the main pump, so that the cooling liquid in the pipeline circulates most smoothly.
Further, specifically, referring to fig. 4, in step 203, controlling the operating state of each branch pump based on the battery branch temperature and the operating mode of the temperature control system includes:
it should be noted that the main purpose of the following steps is: and adjusting the working state of each branch pump based on the judgment result and the operation mode of the temperature control system so as to enable the temperature difference between the temperatures of the battery branches not to exceed a preset value. In practical application, the operation modes of the temperature control system comprise: a heating mode and a cooling mode; in the heating mode, the temperature of the cooling liquid is higher than that of the battery, the temperature of the battery is generally in an increasing state, the flow of the corresponding battery branch is increased, and the heat exchange capacity of the battery branch is increased, so that the temperature is increased quickly; the flow of the corresponding battery branch is reduced, the heat exchange capacity is reduced, and the temperature increase is slowed down. Correspondingly, in the refrigeration mode, the temperature of the cooling liquid is lower than that of the battery, the temperature of the battery is generally in a reduced state, the flow of the corresponding battery branch is increased, the heat exchange capacity of the battery branch is improved, and the temperature is reduced quickly; the flow of the corresponding battery branch is reduced, the heat exchange capacity is reduced, and the temperature reduction is slowed down. Based on a complicated actual environment, there may occur a case where the battery temperature does not decrease in the cooling mode or the battery temperature does not increase in the heating mode. But in these cases the control logic is basically inconvenient. Based on this, in the embodiment of the present invention, the specific manner of controlling the operating state of each branch pump is as follows:
the first target branch pump is a branch pump with a corresponding first judgment result of yes; the second target branch pump is a corresponding branch pump with a second judgment result of yes.
Specifically, for example, the number of the battery branches is 4, and the branch temperature of the battery branch a is 74 degrees celsius; the branch temperature of the battery branch B is 80 ℃; the branch temperature of the battery branch C is 82 ℃; the branch temperature of the battery branch D is 84 degrees celsius. At this time, based on step 401, an average temperature of 80 degrees celsius is obtained;
then, based on the determination in step 402, the first determination result obtained from the temperatures corresponding to the battery branch a and the battery branch B is negative, and the first determination result obtained from the temperatures corresponding to the battery branch C and the battery branch D is positive; determining, based on the step 403, that the second determination result obtained for the temperature corresponding to the battery branch a is yes, and the second determination result obtained for the temperatures corresponding to the battery branch B, the battery branch C, and the battery branch D is no, and based on this, the first target branch pump includes a branch pump corresponding to the battery branch C and the battery branch D; the second target branch pump comprises a branch pump corresponding to the battery branch A.
At this time, specific adjustment is performed according to the modes in step 404, step 405, and step 406: firstly, determining whether the operation mode of the temperature control system is a heating mode or a cooling mode; if the operation mode at this time is the cooling mode, based on step 405 ″, when the operation mode of the temperature control system is the cooling mode, increasing the flow rate of the first target bypass pump, and decreasing the flow rate of the second target bypass pump; "to regulate, i.e.: the flow rates of the branch pumps corresponding to the battery branch C and the battery branch D are increased, so that more cold cooling liquid flows through the battery branch C and the battery branch D, and the temperatures of the battery branch C and the battery branch D are rapidly reduced. Reducing the flow rate of the second target bypass pump is: the branch pump corresponding to the battery branch A reduces the flow rate and reduces the cold coolant passing through the battery branch A, so that the temperature of the battery branch A is reduced and slowed down. The difference of the battery branch temperature corresponding to the battery branch A, the battery branch C and the battery branch D is drawn in.
It should be noted that, in the above-mentioned adjustment process, it is necessary to always ensure that the sum of the flow rates of the branch pumps is not less than the flow rate of the main pump. Preferably, the sum of the flow rates of the branch pumps is approximately equal to the flow rate of the main pump, so that the cooling liquid in the pipeline circulates most smoothly.
Fig. 5 is a fifth schematic flow chart of the temperature difference control method for the multi-branch high-voltage battery system according to the present invention, and referring to fig. 5, the temperature difference control method for the multi-branch high-voltage battery system according to the embodiment of the present invention includes:
if the operating status of the temperature control system is determined to be in the standby status, step 502 to step 506 are executed.
if the operating status of the temperature control system is determined to be working, step 508 to step 514 are executed.
509, respectively judging whether the temperature of each battery branch is greater than the average temperature to obtain a first judgment result;
in specific use, the branch pump with the corresponding first judgment result being yes is the first target branch pump.
in a specific use, the branch pump with the corresponding second judgment result being yes is the second target branch pump.
if the operation mode of the temperature control system is determined to be the cooling mode, step 512 is executed.
if the operating mode of the temperature control system is determined to be the heating mode, step 514 is executed.
And 514, reducing the flow rate of the first target branch pump by a preset flow rate, and increasing the flow rate of the second target branch pump by a preset flow rate.
By the mode, the flow of the cooling liquid of each branch pipeline is adjusted based on the actual temperature difference of each battery branch and the running state of the temperature control system, the temperature of each battery branch is adjusted in a targeted mode, the temperature difference between each battery branch is within an allowable range, the discharging currents of each branch are approximately the same, the consistency of the system is improved, and the influence on the use of a multi-branch high-voltage battery system due to overlarge branch temperature difference is avoided.
Further, in practical applications, when the operation for increasing the preset flow rate is performed, the flow of the coolant pump is increased to the maximum flow rate at most. When the operation for reducing the preset flow rate is performed, the flow of the cooling liquid pump is reduced to zero flow rate at the lowest. Of course, the flow minimum limit of the coolant pump may be manually set, and when the operation of reducing the preset flow is performed, the flow of the coolant pump is reduced to the flow minimum limit of the coolant pump at the lowest.
Fig. 6 is a schematic structural view of a multi-branch high-voltage battery system provided by the present invention; the multi-branch high-voltage battery system provided by the invention is described below, and the multi-branch high-voltage battery system described below and the temperature difference control method of the multi-branch high-voltage battery system described above can be referred to correspondingly. Referring to fig. 6, an embodiment of the present invention provides a multi-branch high-voltage battery system, including:
the battery comprises a plurality of battery branches, a temperature control system and a temperature difference adjusting system;
the temperature control system includes: a main pump 1, a coolant temperature adjusting device 4 and a pipeline; the pipelines comprise a main pipeline and a branch pipeline; the branch pipelines correspond to the battery branches one by one and are used for conveying cooling liquid to each battery branch;
the temperature difference adjusting system comprises a controller 3, a plurality of sensors and a plurality of branch pumps 2; the sensor is used for acquiring the temperature of each battery branch; the branch pumps 2 are correspondingly arranged in the branch pipelines one by one and used for controlling the flow of each branch pipeline; the controller 3 is respectively in communication connection with the temperature control system, each sensor and each branch pump 2, and is used for executing the temperature difference control method of the multi-branch high-voltage battery system provided by the embodiment of the invention. The method comprises the following steps: acquiring the temperature of each battery branch and the operating state of a temperature control system; and controlling the working state of each branch pump 2 based on the battery branch temperature and the operating state of the temperature control system, so that the temperature difference between the battery branch temperatures does not exceed a preset value.
Fig. 7 is a schematic structural view of a multi-branch high-voltage battery system control device provided by the present invention; the multi-branch high-voltage battery system control device provided by the invention is described below, and the multi-branch high-voltage battery system control device described below and the multi-branch high-voltage battery system temperature difference control method described above can be referred to correspondingly. Referring to fig. 7, a multi-branch high-voltage battery system control apparatus according to an embodiment of the present invention includes:
the acquiring unit 71 is used for acquiring the temperature of each battery branch and the operating state of the temperature control system;
the control unit 72 is used for controlling the working state of each branch pump based on the battery branch temperature and the operating state of the temperature control system, so that the temperature difference between the battery branch temperatures does not exceed a preset value;
wherein the temperature control system comprises: the system comprises a main pump, a cooling liquid temperature adjusting device and a pipeline; the pipelines comprise a main pipeline and a branch pipeline; the branch pipelines correspond to the battery branches one by one and are used for conveying cooling liquid to each battery branch; the branch pumps are used for controlling the flow of the cooling liquid passing through each branch pipeline.
Optionally, the operation state of the temperature control system includes a standby state and a working state;
based on battery branch road temperature with temperature control system running state, control each branch road pump operating condition, include:
judging whether the running state of the temperature control system is a standby state or a working state;
when the running state of the temperature control system is a standby state, controlling the main pump to work, and controlling the working state of each branch pump based on the temperature of each battery branch so that the temperature difference between the temperatures of each battery branch does not exceed a preset value;
and when the running state of the temperature control system is a working state, controlling the working state of each branch pump based on the temperature of the battery branches and the running mode of the temperature control system so as to enable the temperature difference between the temperatures of the battery branches not to exceed a preset value.
Optionally, the controlling the working state of each branch pump based on the temperature of the battery branch includes:
calculating the average temperature of the temperature of each battery branch;
calculating the absolute value of the difference value between the temperature of each battery branch and the average temperature;
and adjusting the working state of each branch pump to ensure that the flow of each branch pump is positively correlated with the absolute value of the corresponding difference.
Optionally, the controlling the working state of each branch pump based on the temperature of the battery branch and the operation mode of the temperature control system includes:
calculating the average temperature of the temperature of each battery branch;
respectively judging whether the temperature of each battery branch is greater than the average temperature to obtain a first judgment result;
respectively judging whether the temperature of each battery branch is smaller than the average temperature to obtain a second judgment result;
and adjusting the working state of each branch pump based on the judgment result and the operation mode of the temperature control system so as to enable the temperature difference between the temperatures of the battery branches not to exceed a preset value.
Optionally, the operation modes of the temperature control system include: a heating mode and a cooling mode;
adjusting the working state of each branch pump based on the judgment result and the operation mode of the temperature control system comprises:
determining whether the operation mode of the temperature control system is a heating mode or a cooling mode;
when the operation mode of the temperature control system is a refrigeration mode, the flow of the first target branch pump is increased, and the flow of the second target branch pump is reduced;
when the operation mode of the temperature control system is a heating mode, reducing the flow of the first target branch pump and improving the flow of the second target branch pump;
the first target branch pump is a branch pump with a corresponding first judgment result of yes; the second target branch pump is a corresponding branch pump with a second judgment result of yes.
Optionally, the obtaining the temperature of each battery branch and the operating state of the temperature control system includes:
acquiring the temperature of each battery branch through a plurality of preset temperature sensors;
and receiving the running state information sent by the temperature control system to acquire the running state of the temperature control system.
Fig. 8 illustrates a physical structure diagram of an electronic device, and as shown in fig. 8, the electronic device may include: a processor (processor)810, a communication Interface 820, a memory 830 and a communication bus 840, wherein the processor 810, the communication Interface 820 and the memory 830 communicate with each other via the communication bus 840. The processor 810 may call logic instructions in the memory 830 to execute the temperature difference control method of the multi-branch high-voltage battery system provided by the above embodiments, where the method includes: acquiring the temperature of each battery branch and the operating state of a temperature control system; controlling the working state of each branch pump based on the temperature of the battery branches and the operating state of the temperature control system so that the temperature difference between the temperatures of the battery branches does not exceed a preset value; wherein the temperature control system comprises: the system comprises a main pump, a cooling liquid temperature adjusting device and a pipeline; the pipelines comprise a main pipeline and a branch pipeline; the branch pipelines correspond to the battery branches one by one and are used for conveying cooling liquid to each battery branch; the branch pumps are used for controlling the flow of the cooling liquid passing through each branch pipeline.
In addition, the logic instructions in the memory 830 may be implemented in software functional units and stored in a computer readable storage medium when the logic instructions are sold or used as independent products. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In another aspect, the present invention also provides a computer program product including a computer program stored on a non-transitory computer-readable storage medium, the computer program including program instructions, which, when executed by a computer, enable the computer to execute the temperature difference control method of the multi-branch high-voltage battery system provided in the above embodiments, the method including: acquiring the temperature of each battery branch and the operating state of a temperature control system; controlling the working state of each branch pump based on the temperature of the battery branches and the operating state of the temperature control system so that the temperature difference between the temperatures of the battery branches does not exceed a preset value; wherein the temperature control system comprises: the system comprises a main pump, a cooling liquid temperature adjusting device and a pipeline; the pipelines comprise a main pipeline and a branch pipeline; the branch pipelines correspond to the battery branches one by one and are used for conveying cooling liquid to each battery branch; the branch pumps are used for controlling the flow of the cooling liquid passing through each branch pipeline.
In yet another aspect, the present invention also provides a non-transitory computer-readable storage medium having stored thereon a computer program, which when executed by a processor, is implemented to perform the above-provided multi-branch high-voltage battery system temperature difference control method, the method comprising: acquiring the temperature of each battery branch and the operating state of a temperature control system; controlling the working state of each branch pump based on the temperature of the battery branches and the operating state of the temperature control system so that the temperature difference between the temperatures of the battery branches does not exceed a preset value; wherein the temperature control system comprises: the system comprises a main pump, a cooling liquid temperature adjusting device and a pipeline; the pipelines comprise a main pipeline and a branch pipeline; the branch pipelines correspond to the battery branches one by one and are used for conveying cooling liquid to each battery branch; the branch pumps are used for controlling the flow of the cooling liquid passing through each branch pipeline.
The present invention also provides a vehicle comprising: a vehicle main body and a multi-branch high-voltage battery system;
the multi-branch high-voltage battery system executes the temperature difference control method of the multi-branch high-voltage battery system, which comprises the following steps: acquiring the temperature of each battery branch and the operating state of a temperature control system; controlling the working state of each branch pump based on the temperature of the battery branches and the operating state of the temperature control system so that the temperature difference between the temperatures of the battery branches does not exceed a preset value; wherein the temperature control system comprises: the system comprises a main pump, a cooling liquid temperature adjusting device and a pipeline; the pipelines comprise a main pipeline and a branch pipeline; the branch pipelines correspond to the battery branches one by one and are used for conveying cooling liquid to each battery branch; the branch pumps are used for controlling the flow of the cooling liquid passing through each branch pipeline.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention. The invention relates to the technical field of battery correlation, in particular to a multi-branch high-voltage battery system and a temperature difference control method and device thereof.
Claims (9)
1. A temperature difference control method for a multi-branch high-voltage battery system is characterized by comprising the following steps:
acquiring the temperature of each battery branch and the operating state of a temperature control system;
controlling the working state of each branch pump based on the temperature of the battery branches and the operating state of the temperature control system so that the temperature difference between the temperatures of the battery branches does not exceed a preset value;
wherein the temperature control system comprises a branch conduit; the branch pipelines correspond to the battery branches one by one and are used for conveying cooling liquid to each battery branch;
the branch pumps are used for controlling the flow of the cooling liquid passing through each branch pipeline;
the operating state of the temperature control system comprises a standby state and a working state;
based on battery branch road temperature with temperature control system running state, control each branch road pump operating condition, include:
judging whether the running state of the temperature control system is a standby state or a working state;
when the running state of the temperature control system is a standby state, controlling a main pump of the temperature control system to work, and controlling the working state of each branch pump based on the temperature of each battery branch so that the temperature difference between the temperatures of each battery branch does not exceed a preset value;
and when the running state of the temperature control system is a working state, controlling the working state of each branch pump based on the temperature of the battery branches and the running mode of the temperature control system so as to enable the temperature difference between the temperatures of the battery branches not to exceed a preset value.
2. The temperature difference control method for the multi-branch high-voltage battery system according to claim 1, wherein the controlling the operating state of each branch pump based on the battery branch temperature comprises:
calculating the average temperature of the temperature of each battery branch;
calculating the absolute value of the difference value between the temperature of each battery branch and the average temperature;
and adjusting the working state of each branch pump to ensure that the flow of each branch pump is positively correlated with the absolute value of the corresponding difference.
3. The temperature difference control method for the multi-branch high-voltage battery system according to claim 1, wherein the controlling the operating state of each branch pump based on the battery branch temperature and the operating mode of the temperature control system comprises:
calculating the average temperature of the temperature of each battery branch;
respectively judging whether the temperature of each battery branch is greater than the average temperature to obtain a first judgment result;
respectively judging whether the temperature of each battery branch is smaller than the average temperature to obtain a second judgment result;
and adjusting the working state of each branch pump based on the first judgment result, the second judgment result and the operation mode of the temperature control system, so that the temperature difference between the temperatures of the battery branches does not exceed a preset value.
4. The multi-branch high-voltage battery system temperature difference control method according to claim 3, wherein the temperature control system operation mode includes: a heating mode and a cooling mode;
adjusting the working state of each branch pump based on the first determination result, the second determination result and the operation mode of the temperature control system includes:
determining whether the operation mode of the temperature control system is a heating mode or a cooling mode;
when the operation mode of the temperature control system is a refrigeration mode, increasing the flow of the first target branch pump by a preset flow, and reducing the flow of the second target branch pump by the preset flow;
when the operation mode of the temperature control system is a heating mode, reducing the flow of the first target branch pump by a preset flow, and increasing the flow of the second target branch pump by the preset flow;
the first target branch pump is a branch pump with a corresponding first judgment result of yes; the second target branch pump is a corresponding branch pump with a second judgment result of yes.
5. A multi-branch high voltage battery system, comprising: the system comprises a plurality of battery branches, a temperature control system and a temperature difference adjusting system;
the temperature control system includes: a main pump, a temperature regulating device and a pipeline; the pipelines comprise a main pipeline and a branch pipeline; the branch pipelines correspond to the battery branches one by one and are used for conveying cooling liquid to each battery branch;
the temperature difference adjusting system comprises a controller, a plurality of sensors and a plurality of branch pumps; the sensor is used for acquiring the temperature of each battery branch; the branch pumps are correspondingly arranged in the branch pipelines one by one and used for controlling the flow of each branch pipeline; the controller is respectively connected with the temperature control system, the sensors and the branch pumps in a communication mode and used for executing the temperature difference control method of the multi-branch high-voltage battery system according to any one of claims 1 to 4.
6. A multi-branch high-voltage battery system control device, comprising:
the acquisition unit is used for acquiring the temperature of each battery branch and the operating state of the temperature control system;
the control unit is used for controlling the working state of each branch pump based on the temperature of the battery branches and the running state of the temperature control system so as to enable the temperature difference between the temperatures of the battery branches not to exceed a preset value;
wherein the temperature control system comprises a branch conduit; the branch pipelines correspond to the battery branches one by one and are used for sending cooling liquid to each battery branch;
the branch pumps are used for controlling the flow of the cooling liquid passing through each branch pipeline;
the operating state of the temperature control system comprises a standby state and a working state;
based on battery branch road temperature with temperature control system running state, control each branch road pump operating condition, include:
judging whether the running state of the temperature control system is a standby state or a working state;
when the running state of the temperature control system is a standby state, controlling a main pump of the temperature control system to work, and controlling the working state of each branch pump based on the temperature of each battery branch so that the temperature difference between the temperatures of each battery branch does not exceed a preset value;
and when the running state of the temperature control system is a working state, controlling the working state of each branch pump based on the temperature of the battery branches and the running mode of the temperature control system so as to enable the temperature difference between the temperatures of the battery branches not to exceed a preset value.
7. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor when executing the program implements the steps of the multi-branch high voltage battery system temperature difference control method according to any one of claims 1 to 4.
8. A non-transitory computer-readable storage medium having stored thereon a computer program, wherein the computer program, when executed by a processor, implements the steps of the multi-branch high voltage battery system temperature difference control method according to any one of claims 1 to 4.
9. A vehicle, characterized by comprising: a vehicle main body and a multi-branch high-voltage battery system;
the multi-branch high-voltage battery system performs the temperature difference control method of the multi-branch high-voltage battery system according to any one of claims 1 to 4.
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