CN109962316B - Battery system thermal management method and device - Google Patents
Battery system thermal management method and device Download PDFInfo
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- CN109962316B CN109962316B CN201711427877.9A CN201711427877A CN109962316B CN 109962316 B CN109962316 B CN 109962316B CN 201711427877 A CN201711427877 A CN 201711427877A CN 109962316 B CN109962316 B CN 109962316B
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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
- H01M10/63—Control systems
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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 provides a battery system thermal management method and a device, wherein the method comprises the following steps: the method comprises the steps of obtaining state information of a plurality of battery strings in a battery system by controlling the working state of a fan corresponding to a battery pack needing thermal operation, wherein the state information comprises temperature information of each battery string; generating a thermal operation instruction according to the temperature information of the battery string; and controlling a cooling device corresponding to the battery string to cool the battery pack in the battery string according to the thermal operation instruction. On one hand, the optimization of the control of the cooling device is achieved, and the service life of the cooling device is utilized to the maximum extent; on the other hand, a plurality of cooling devices are not required to be started simultaneously, and the working stability of the battery system cannot be influenced due to the generation of larger instantaneous impact current.
Description
Technical Field
The invention belongs to the technical field of battery management of a rail energy feed system, and particularly relates to a battery system thermal management method and device.
Background
With the increase of the capacity demand of the energy storage container in the rail energy feed system by the market, more and more battery packs are required to dissipate heat in the energy storage container, however, due to different layouts of the battery packs in the energy storage container, the heat dissipation conditions are different, the prior art generally performs collective control on a plurality of fans, namely controls the plurality of fans to be turned on/off simultaneously, on one hand, the optimization of fan control cannot be achieved, in other words, the maximum utilization of the service life of the fans cannot be achieved; on the other hand, a plurality of fan is opened simultaneously, can produce instantaneous great impulse current, causes the switching power supply protection action in the energy storage container easily, causes the switching power supply condition emergence that no longer supplies power to the fan, has influenced battery system job stabilization nature in the energy storage container.
Therefore, there is a need for improvements in the thermal management techniques of battery systems in existing energy storage containers.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, the first objective of the present invention is to provide a battery system thermal management method, in which a battery pack that needs to be thermally operated is cooled by controlling a cooling device corresponding to a battery string, so as to improve the temperature consistency of each battery pack, thereby optimizing the control of the cooling device and maximally utilizing the service life of the cooling device; meanwhile, the plurality of cooling devices are not required to be started simultaneously, so that large instantaneous impact current cannot be generated, the switch power supply in the energy storage container is protected from acting, and the working stability of the battery system in the energy storage container is ensured.
A second object of the invention is to propose a non-transitory computer-readable storage medium.
A third object of the present invention is to provide a thermal management device for a battery system.
A fourth object of the present invention is to provide a battery system.
In order to achieve the above object, an embodiment of the first aspect of the present invention provides a battery system thermal management method, including:
acquiring state information of a plurality of battery strings in a battery system, wherein the state information comprises temperature information of each battery string;
generating a thermal operation instruction according to the temperature information of the battery string;
and controlling a cooling device corresponding to the battery string to cool the battery pack in the battery string according to the thermal operation instruction.
According to the battery system thermal management control method, the state information of a plurality of battery strings in the battery system is obtained, wherein the state information comprises the temperature information of each battery string; generating a thermal operation instruction according to the temperature information of the battery string; and controlling a cooling device corresponding to the battery string to cool the battery packs in the battery string according to the thermal operation instruction, so as to improve the temperature consistency of each battery pack. In the embodiment, the battery packs which need to be subjected to thermal operation are cooled by controlling the cooling devices corresponding to the battery strings, so that the temperature consistency of each battery pack is improved, the control optimization of the cooling devices is realized, the service lives of the cooling devices are utilized to the maximum extent, meanwhile, a plurality of cooling devices do not need to be started simultaneously, larger instantaneous impact current cannot be generated, the switch power supply in the energy storage container cannot act, and the working stability of the battery system in the energy storage container is ensured; in addition, the heat of each battery pack is managed in a balanced mode, the temperature consistency of each battery pack is improved, and the service life and the performance of each battery pack are further improved.
To achieve the above object, a non-transitory computer readable storage medium is provided in an embodiment of the second aspect of the present invention, and a computer program is stored on the non-transitory computer readable storage medium, and when executed by a processor, the non-transitory computer readable storage medium implements the battery system thermal management method according to the embodiment of the first aspect of the present invention.
According to the non-transitory computer readable storage medium of the embodiment of the invention, through executing the stored computer program, the optimization of the control of the cooling devices can be achieved, the maximum utilization of the service life of the cooling devices is realized, a plurality of cooling devices do not need to be started simultaneously, larger instantaneous impact current cannot be generated, the protection of the switching power supply in the energy storage container cannot be operated, and the working stability of the battery system in the energy storage container is ensured.
In order to achieve the above object, a third aspect of the present invention provides a thermal management device for a battery system, including:
the battery management units are used for detecting the state information of each battery pack in the battery packs;
the battery electronic control unit is respectively electrically connected with the battery management units and is used for receiving the state information of each battery pack in the battery packs, acquiring the state information of the battery strings in the battery system and generating a thermal operation instruction according to the temperature information of the battery strings;
the temperature reduction device control unit is electrically connected with the battery electric control unit and controls the temperature reduction device corresponding to the battery string to reduce the temperature of the battery pack in the battery string according to the thermal operation instruction;
the battery pack cooling system comprises a plurality of cooling devices, wherein one side of the battery pack is provided with one cooling device, and each cooling device is electrically connected with a cooling device control unit and used for carrying out thermal operation on the battery pack in the battery system.
The battery system heat management device of the embodiment of the invention obtains the state information of a plurality of battery strings in the battery system, wherein the state information comprises the temperature information of each battery string; generating a thermal operation instruction according to the temperature information of the battery string; and controlling a cooling device corresponding to the battery string to cool the battery pack in the battery string according to the thermal operation instruction. The battery pack which needs to be thermally operated is cooled by controlling the cooling device corresponding to the battery string, and the temperature consistency of each battery pack is improved. In the related art, the battery electronic control unit controls the on/off of the cooling device, and because the number of the IO ports of the chip is limited, the number of the controllable cooling devices is limited, and the running condition of the controllable cooling devices cannot be well managed; in this embodiment, the cooling device control unit serves as an independent control unit in the battery system thermal management device, receives a control instruction from the battery electronic control unit through the CAN communication, and performs independent start-stop control on each cooling device according to the control instruction, so that the control of the cooling devices is optimized, and the service life of the cooling devices is maximally utilized.
In addition, a thermal management device for a battery system according to an embodiment of the present invention may have the following additional technical features.
According to one embodiment of the present invention, each of the battery management units includes:
the monitoring module is used for acquiring the state information of each battery pack in the plurality of battery packs;
and the control module is used for sending the state information of each battery pack acquired by the monitoring module to the battery electric control unit.
According to one embodiment of the invention, the cooling means are fans and each fan comprises a motor and at least one fan blade.
According to one embodiment of the invention, the motor of the fan is arranged to run at a variable speed.
The beneficial effect who adopts above-mentioned scheme is:
because the cooling device control unit is used as an independent control unit in the battery system heat management device, the CAN communication is adopted to receive the control instruction from the battery electric control unit, and the independent start-stop control is carried out on each cooling device according to the control instruction, so that the optimization of fan control is achieved, and the maximum utilization of the service life of the fan is realized; meanwhile, the rotating speed of the fan can be automatically adjusted according to the heat dissipation conditions of the battery packs in the energy storage container, so that the temperature information of each battery pack is basically kept consistent, the heat of each battery pack is balanced and managed, the temperature consistency of each battery pack is improved, and the service life and the performance of each battery pack are further improved.
In addition, the embodiment of the invention also provides a battery system which comprises the battery thermal management device.
According to the battery system provided by the embodiment of the invention, the temperature reduction device control unit is independently arranged in the battery heat management device, the CAN communication is adopted to receive the control instruction from the battery electric control unit, the independent start-stop control is carried out on each fan according to the fan control instruction, the optimization of fan control is achieved, the service life of the fan is maximally utilized, and meanwhile, the temperature information of each battery pack is basically kept consistent, so that the heat of each battery pack is uniformly managed, the temperature consistency of each battery pack is improved, and the service life and the performance of the battery pack are further improved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a block diagram illustrating a battery system according to an embodiment of the present invention.
Fig. 2 is a block diagram illustrating a battery thermal management apparatus according to an embodiment of the present invention.
Fig. 3 is a flowchart of a battery thermal management method according to an embodiment of the present invention.
Fig. 4 is a flowchart illustrating protection of communication interruption between a battery control unit and a fan control unit according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the invention.
The following disclosure provides many different embodiments, or examples, for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize the applicability of other processes and/or the use of other materials. In addition, the structure of a first feature described below as "on" a second feature may include embodiments in which the first and second features are formed in direct contact, and may also include embodiments in which additional features are formed between the first and second features, such that the first and second features may not be in direct contact.
In the description of the present invention, it should be noted that, unless otherwise specified and limited, the terms "mounted," "connected" and "connected" should be construed broadly, and may be, for example, a mechanical connection or an electrical connection, a communication between two elements, a direct connection, or an indirect connection through an intermediate medium, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
A battery system thermal management method and apparatus according to an embodiment of the present invention will be described with reference to the accompanying drawings. Before describing embodiments of the present invention in detail, for ease of understanding, common terminology will be introduced first:
a Battery Electronic Control Unit (BECU) is a core component of a Battery system of an energy storage container, and is used for controlling the Battery system, and the main functions of the BECU can be divided into Battery string Control and monitoring, fault diagnosis and the like.
The Battery Management Unit (BMU) can detect the temperature, the voltage, the fault and the alarm information of the Battery pack in real time, has multiple protection functions of preventing the Battery from being overcharged and overdischarged and the like, effectively transmits information, improves the utilization efficiency of the Battery and prolongs the service life of the Battery.
Fig. 1 is a schematic block diagram of a battery system according to an embodiment of the present invention.
As shown in fig. 1, the battery system 7 according to the embodiment of the present invention includes a plurality of battery packs 4, and for facilitating management of the battery packs 4, the plurality of battery packs 4 may be arranged in multiple rows in the arrangement shown in fig. 1 and disposed in the battery system 7, wherein each row of battery packs 4 constitutes a battery string 6. By the design, each battery pack 4 is conveniently and uniformly managed, and the service life and the performance of the battery pack are improved.
To describe the thermal management of the battery system in more detail, this embodiment provides a thermal management apparatus for the battery system, and fig. 2 is a block diagram of the thermal management apparatus for the battery according to the embodiment of the present invention.
As shown in fig. 2, the thermal management device of the battery system is mainly composed of a plurality of battery management units, a battery electronic control unit, a cooling device control unit and a plurality of cooling devices.
The battery management units 5 are used for detecting the state information of each battery pack 4 in the battery packs 4; the battery electronic control unit 1 is respectively and electrically connected with the battery management units 5, and is used for receiving the state information of each battery pack 4 in the battery packs 4, acquiring the state information of the battery strings 6 in a battery system, and generating a thermal operation instruction CAN message according to the temperature information of the battery strings 6; in this embodiment, the cooling device control unit adopts a fan control unit 2, and the fan control unit 2 is electrically connected with the battery electronic control unit 1 and is used for analyzing the thermal operation instruction CAN message and controlling the cooling device corresponding to the battery string to cool the battery pack in the battery string; in this embodiment, the cooling device employs fans 3, one side of each battery pack is provided with one fan 3, and each fan 3 is electrically connected to the fan control unit 2, and is used for performing thermal operation on the battery pack in the battery system.
That is to say, the battery management unit 5 detects the temperature information of the corresponding battery pack 4, and each battery management unit 5 respectively sends the detected temperature information of the battery pack to the battery electronic control unit 1, and determines which battery packs in the battery string need to be subjected to thermal operation through the summary calculation of the battery electronic control unit, and the battery electronic control unit 1 sends a control instruction to the fan control unit 2 through the CAN communication, and the fan control unit 2 controls the fan 3 corresponding to the battery pack which needs to be subjected to thermal operation to work. Therefore, the embodiment of the invention improves the temperature consistency of the battery pack in the using process through the heat balance management of the battery pack, reduces the self-discharge phenomenon of the battery caused by temperature difference, and prevents the inconsistency of other performances such as internal resistance of the battery, thereby ensuring the long-term consistency among the battery packs and reducing the maintenance work of the battery packs.
In the prior art, the battery electronic control unit directly controls the start and stop of the fan, and the number of controllable fans is limited due to the limited number of IO ports of the control chip, and the controlled fans cannot be well managed. In this embodiment, the fan control unit is separately arranged in the battery thermal management device, the CAN communication is adopted to receive the control instruction from the battery electronic control unit, and the individual start-stop control is performed on each fan according to the fan control instruction.
In one embodiment of the present invention, each of the battery management units includes: the monitoring module is used for acquiring the state information of each battery pack in the plurality of battery packs; and the control module is used for sending the state information of each battery pack acquired by the monitoring module to the battery electric control unit. The state information can also comprise the voltage and current information of each battery pack, and the battery management unit improves the utilization efficiency of the battery and prolongs the service life of the battery through effective information transmission.
In one embodiment of the invention, each fan comprises a motor and at least one fan blade, the motor of the fan being arranged to run at a variable speed. Because the heat dissipation conditions of each battery pack in the battery system are different, the rotating speed of the fan can be set according to actual requirements. In other words, because the placing positions of the battery packs are different, the heat dissipation conditions of the battery packs are different, the heat dissipation is facilitated in some positions, and the heat dissipation conditions of some positions are poor, so that the rotating speed of the fan corresponding to the battery pack easy to dissipate heat can be reduced according to actual conditions, the rotating speed of the fan corresponding to the battery pack poor in heat dissipation conditions is increased, the temperature consistency of the battery packs in the using process is improved, the generation of the self-discharge phenomenon of the batteries caused by the temperature difference is reduced, the inconsistency of other performances such as the internal resistance of the batteries is prevented, the long-term consistency among the battery packs is ensured, and the maintenance work of the battery packs is reduced.
Fig. 3 is a flow chart of a method of thermal management of a battery according to an embodiment of the invention. As shown in fig. 3, the thermal management method of the battery system includes the following steps:
in this embodiment of the present invention, the acquiring state information of a plurality of battery strings in a battery system, where the state information includes temperature information of each battery string, includes:
obtaining the highest temperature of a plurality of battery packs in the first battery string, and marking the highest temperature as a first highest temperature;
obtaining the highest temperature of a plurality of battery packs in the second battery string, and marking the highest temperature as a second highest temperature;
obtaining the highest temperature of a plurality of battery packs in the third battery string, and marking the highest temperature as a third highest temperature;
......
and acquiring the highest temperature of a plurality of battery packs in the Nth battery string, and marking as the Nth highest temperature.
102, generating a thermal operation instruction according to the temperature information of the battery string;
in the embodiment of the present invention, the battery electronic control unit 1 determines which battery packs in the battery string need to be subjected to thermal operation through the summary calculation of the battery electronic control unit according to the temperature information of each battery string, and generates a thermal operation instruction CAN message at the same time.
And 103, controlling a temperature reduction device corresponding to the battery string to reduce the temperature of the battery pack in the battery string according to the thermal operation instruction.
In the embodiment of the invention, the fan control unit 2 analyzes the thermal operation instruction CAN message sent by the battery electronic control unit 1, and the temperature of the battery pack in the battery string is reduced by controlling the temperature reducing device corresponding to the battery string, so that the temperature consistency of each battery pack is improved. It should be noted that, the temperature reduction device corresponding to the battery string in this example may refer to a temperature reduction device that is arranged to reduce the temperature of the entire battery string, so as to reduce the temperature of the battery pack that needs to be thermally operated; or a plurality of cooling devices are arranged in the battery string, and the cooling devices correspond to the battery packs one to one.
According to the thermal management method of the battery system in the embodiment of the invention, the battery packs in the battery string are cooled by controlling the cooling devices corresponding to the battery string, so that the cooling devices perform refrigerating thermal operation on the battery packs needing thermal operation, the temperature consistency of each battery pack is improved, the control optimization of the cooling devices is realized, the service lives of the cooling devices are utilized to the maximum extent, meanwhile, the plurality of cooling devices do not need to be started simultaneously, larger instantaneous impact current cannot be generated, the switch power supply protection in the energy storage container cannot act, and the working stability of the battery system in the energy storage container is ensured; in addition, the heat of each battery pack is managed in a balanced mode, the temperature consistency of each battery pack is improved, and the service life and the performance of each battery pack are further improved.
According to an embodiment of the present invention, a thermal operation instruction may be generated according to temperature information of the battery string, where a battery pack with a highest temperature among a plurality of battery packs of a first battery string is defined as a first battery pack, and a corresponding temperature of the first battery pack is marked as a first highest temperature; when the first maximum temperature is less than or equal to a first preset temperature, acquiring a thermal operation instruction that a cooling device corresponding to the first battery pack does not need to cool the battery pack; when the first maximum temperature is larger than a first preset temperature, acquiring a thermal operation instruction for cooling the battery pack by a cooling device corresponding to the first battery pack until the difference between the temperature of the first battery pack and the actual temperature of the first maximum temperature is smaller than or equal to a preset difference; when the actual temperature difference value between the temperature of the first battery pack and the first highest temperature is less than or equal to a preset difference value, judging whether the temperature of the first battery pack is greater than a second preset temperature, wherein the second preset temperature is less than the first preset temperature; when the temperature of the first battery pack is less than or equal to a second preset temperature, acquiring a thermal operation instruction of a cooling device corresponding to the first battery pack for stopping cooling the battery pack; and when the temperature of the first battery pack is higher than a second preset temperature, acquiring a thermal operation instruction for keeping the temperature reduction of the battery pack by a temperature reduction device corresponding to the first battery pack. Therefore, the optimization of the control of the cooling device is achieved, the service life of the cooling device is maximally utilized, the temperature consistency of the battery pack in the use process is improved, the self-discharge phenomenon of the battery caused by temperature difference is reduced, and the inconsistency of other performances such as internal resistance of the battery is prevented, so that the long-term consistency among the battery packs is ensured, and the maintenance work of the battery packs is reduced.
According to an embodiment of the present invention, a thermal operation instruction may be generated according to temperature information of the battery string, where a battery pack with a highest temperature among a plurality of battery packs of a second battery string is defined as a second battery pack, and a corresponding temperature of the second battery pack is marked as a second highest temperature; when the second highest temperature is less than or equal to a first preset temperature, acquiring a thermal operation instruction that a cooling device corresponding to the second battery pack does not need to cool the battery pack; when the second highest temperature is higher than a first preset temperature, acquiring a thermal operation instruction for cooling the battery pack by a cooling device corresponding to the second battery pack until the difference between the temperature of the second battery pack and the actual temperature of the second highest temperature is less than or equal to a preset difference; when the actual temperature difference value between the temperature of the second battery pack and the second highest temperature is less than or equal to a preset difference value, judging whether the temperature of the second battery pack is greater than a second preset temperature, wherein the second preset temperature is less than the first preset temperature; when the temperature of the second battery pack is less than or equal to a second preset temperature, acquiring a thermal operation instruction of a cooling device corresponding to the second battery pack for stopping cooling the battery pack; and when the temperature of the second battery pack is higher than a second preset temperature, acquiring a thermal operation instruction for keeping the temperature reduction of the battery pack by a temperature reduction device corresponding to the second battery pack. Therefore, the optimization of the control of the cooling device is achieved, the service life of the cooling device is maximally utilized, the temperature consistency of the battery pack in the use process is improved, the self-discharge phenomenon of the battery caused by temperature difference is reduced, and the inconsistency of other performances such as internal resistance of the battery is prevented, so that the long-term consistency among the battery packs is ensured, and the maintenance work of the battery packs is reduced.
According to an embodiment of the present invention, a thermal operation instruction may be generated according to temperature information of the battery string, where a battery pack with a highest temperature among a plurality of battery packs of a third battery string is defined as a third battery pack, and a corresponding temperature of the third battery pack is marked as a third highest temperature; when the third maximum temperature is less than or equal to a first preset temperature, acquiring a thermal operation instruction that a cooling device corresponding to the third battery pack does not need to cool the battery pack; when the third maximum temperature is higher than the first preset temperature, acquiring a thermal operation instruction for cooling the battery pack by a cooling device corresponding to the third battery pack until the difference between the temperature of the third battery pack and the actual temperature of the third maximum temperature is less than or equal to a preset difference; when the actual temperature difference value between the temperature of the third battery pack and the third highest temperature is less than or equal to a preset difference value, judging whether the temperature of the third battery pack is greater than a second preset temperature, wherein the second preset temperature is less than the first preset temperature; when the temperature of the third battery pack is less than or equal to a second preset temperature, acquiring a thermal operation instruction of a cooling device corresponding to the third battery pack for stopping cooling the battery pack; and when the temperature of the third battery pack is higher than a second preset temperature, acquiring a thermal operation instruction for keeping the temperature reduction of the battery pack by a temperature reduction device corresponding to the third battery pack. Therefore, the optimization of the control of the cooling device is achieved, the service life of the cooling device is maximally utilized, the temperature consistency of the battery pack in the use process is improved, the self-discharge phenomenon of the battery caused by temperature difference is reduced, and the inconsistency of other performances such as internal resistance of the battery is prevented, so that the long-term consistency among the battery packs is ensured, and the maintenance work of the battery packs is reduced.
According to an embodiment of the present invention, a thermal operation instruction may be generated according to temperature information of the battery string, where a battery pack with a highest temperature among a plurality of battery packs of an nth battery string is defined as an nth battery pack, and a corresponding temperature of the battery pack is labeled as an nth highest temperature; when the Nth highest temperature is less than or equal to a first preset temperature, acquiring a thermal operation instruction that a cooling device corresponding to the Nth battery pack does not need to cool the battery pack; when the Nth highest temperature is higher than a first preset temperature, acquiring a thermal operation instruction for cooling the battery pack by a cooling device corresponding to the Nth battery pack until the difference between the temperature of the Nth battery pack and the actual temperature of the Nth highest temperature is less than or equal to a preset difference; when the actual temperature difference value between the temperature of the Nth battery pack and the Nth highest temperature is less than or equal to a preset difference value, judging whether the temperature of the Nth battery pack is greater than a second preset temperature, wherein the second preset temperature is less than the first preset temperature; when the temperature of the Nth battery pack is less than or equal to a second preset temperature, acquiring a thermal operation instruction of a cooling device corresponding to the Nth battery pack for stopping cooling the battery pack; and when the temperature of the Nth battery pack is higher than a second preset temperature, acquiring a thermal operation instruction for keeping the temperature reduction of the battery pack by a temperature reduction device corresponding to the Nth battery pack. Therefore, the optimization of the control of the cooling device is achieved, the service life of the cooling device is utilized to the maximum extent, the temperature consistency of the battery pack in the using process is improved, the self-discharge phenomenon of the battery caused by temperature difference is reduced, and the inconsistency of other performances such as internal resistance of the battery is prevented, so that the long-term consistency among the battery packs is ensured, and the maintenance work of the battery packs is reduced.
As a possible implementation manner, when the heat dissipation condition of a position where a certain battery pack is located is poor, the cooling device corresponding to the battery pack is frequently turned on, so as to avoid the influence on the service life of the cooling device due to frequent turning on. In the embodiment of the invention, a program timer is designed to time each cooling device when the state of the cooling device is turned over, in other words, the time from closing to opening of the same cooling device or the time from opening to closing of the same cooling device is recorded.
According to an embodiment of the present invention, controlling a temperature reduction device corresponding to a battery string to reduce the temperature of a battery pack in the battery string according to the thermal operation instruction includes: controlling a cooling device corresponding to the battery pack to be turned on from off according to the thermal operation instruction; judging whether the time interval from the closing to the opening of the cooling device is greater than a first time period or not; if the time interval from closing to opening of the cooling device is less than a first time period, the cooling device maintains a closing state; and if the time interval from closing to opening of the cooling device is greater than a first time period, the cooling device is opened.
According to another embodiment of the present invention, the controlling the temperature reduction device corresponding to the battery string to reduce the temperature of the battery pack in the battery string according to the thermal operation instruction further includes: controlling a cooling device corresponding to the battery pack to be switched on or switched off according to the thermal operation instruction; judging whether the time interval from the opening to the closing of the cooling device is greater than a second time period or not; if the time interval from the opening to the closing of the cooling device is less than a second time period, the cooling device maintains the opening state; and if the time interval from the turning-off to the turning-on of the fan is greater than a second time period, the cooling device is turned off.
In summary, the first time period and the second time period can be set to prevent the same fan from being frequently started, and further the service life of the fan is influenced.
Fig. 4 is a flowchart illustrating protection of communication interruption between a battery control unit and a fan control unit according to an embodiment of the present invention. As shown in fig. 4, the protection method includes the following steps:
specifically, it is detected whether the communication between the battery ecu 1 and the battery management unit 5 is interrupted, that is, it is detected whether the battery management unit 5 CAN receive the CAN message of the thermal operation command sent by the battery ecu 1.
as a possible implementation, the communication between the battery ecu 1 and the battery management unit 5 may be interrupted for a short time, not actually due to a fault, so that it is necessary to determine whether the communication between the battery ecu 1 and the battery management unit 5 is actually interrupted.
Specifically, whether the communication interruption time between the battery electronic control unit 1 and the battery management unit 5 is greater than the set interruption protection time is judged, if yes, the communication between the battery electronic control unit 1 and the battery management unit 5 is determined to be interrupted, and if not, the communication between the battery electronic control unit 1 and the battery management unit 5 is determined to be recovered.
specifically, the fan control unit stops responding to the control instruction and controls the fan in the battery system to be started at set fan interval starting time.
as a possible implementation manner, communication between the battery ecu 1 and the battery management unit 5 may be recovered for a short time, but communication is not actually recovered, so that it is necessary to determine whether communication between the battery ecu 1 and the battery management unit 5 is recovered.
Specifically, whether the communication recovery time between the battery electronic control unit 1 and the battery management unit 5 is greater than the set recovery judgment time is judged, if yes, the communication recovery between the battery electronic control unit 1 and the battery management unit 5 is determined, and if not, the communication interruption between the battery electronic control unit 1 and the battery management unit 5 is determined.
specifically, the communication between the battery electronic control unit 1 and the battery management unit 5 is recovered, and the fan control unit 2 receives the thermal operation instruction CAN message sent by the battery electronic control unit 1 again, and controls the fan 3 corresponding to the battery pack 4 which needs to be thermally operated to work.
The battery electronic control unit and the fan control unit in the embodiment of the invention are protected by communication interruption, so that the situation that the battery pack is continuously heated to further influence the operation of a battery system due to the communication interruption of the fan control unit and the battery electronic control unit is avoided.
In order to implement the above embodiments, the present invention also proposes a non-transitory computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the battery system thermal management method as described above.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. A method for thermal management of a battery system, comprising the steps of:
acquiring state information of a plurality of battery strings in a battery system, wherein the state information comprises temperature information of each battery string;
generating a thermal operation instruction according to the temperature information of the battery string;
controlling a temperature reduction device corresponding to the battery string to reduce the temperature of the battery pack in the battery string according to the thermal operation instruction,
the acquiring of the state information of a plurality of battery strings in the battery system, wherein the state information includes temperature information of each battery string, includes:
obtaining the highest temperature of a plurality of battery packs in the first battery string, and marking the highest temperature as a first highest temperature;
obtaining the highest temperature of a plurality of battery packs in the second battery string, and marking the highest temperature as a second highest temperature;
obtaining the highest temperature of a plurality of battery packs in the third battery string, and marking the highest temperature as a third highest temperature;
......
acquiring the highest temperature of a plurality of battery packs in the Nth battery string, marking as the Nth highest temperature,
wherein the generating of the thermal operation instruction according to the temperature information of the battery string comprises:
defining a battery pack with the highest temperature in a plurality of battery packs of the first battery string as a first battery pack, and marking the corresponding temperature as a first highest temperature;
when the first maximum temperature is less than or equal to a first preset temperature, acquiring a thermal operation instruction that a cooling device corresponding to the first battery pack does not need to cool the battery pack;
when the first maximum temperature is larger than a first preset temperature, acquiring a thermal operation instruction for cooling the battery pack by a cooling device corresponding to the first battery pack until the difference between the temperature of the first battery pack and the actual temperature of the first maximum temperature is smaller than or equal to a preset difference;
when the actual temperature difference value between the temperature of the first battery pack and the first highest temperature is less than or equal to a preset difference value, judging whether the temperature of the first battery pack is greater than a second preset temperature, wherein the second preset temperature is less than the first preset temperature;
when the temperature of the first battery pack is less than or equal to a second preset temperature, acquiring a thermal operation instruction of a cooling device corresponding to the first battery pack for stopping cooling the battery pack;
when the temperature of the first battery pack is higher than a second preset temperature, acquiring a thermal operation instruction for keeping the temperature reduction of the battery pack by a temperature reduction device corresponding to the first battery pack;
defining a battery pack with the highest temperature in a plurality of battery packs of the second battery string as a second battery pack, and marking the corresponding temperature as the second highest temperature;
when the second highest temperature is less than or equal to a first preset temperature, acquiring a thermal operation instruction that a cooling device corresponding to the second battery pack does not need to cool the battery pack;
when the second highest temperature is higher than a first preset temperature, acquiring a thermal operation instruction for cooling the battery pack by a cooling device corresponding to the second battery pack until the difference between the temperature of the second battery pack and the actual temperature of the second highest temperature is less than or equal to a preset difference;
when the actual temperature difference value between the temperature of the second battery pack and the second highest temperature is less than or equal to a preset difference value, judging whether the temperature of the second battery pack is greater than a second preset temperature, wherein the second preset temperature is less than the first preset temperature;
when the temperature of the second battery pack is less than or equal to a second preset temperature, acquiring a thermal operation instruction of a temperature reduction device corresponding to the second battery pack for stopping temperature reduction of the battery pack;
when the temperature of the second battery pack is higher than a second preset temperature, acquiring a thermal operation instruction of a cooling device corresponding to the second battery pack for keeping the temperature of the battery pack to be reduced;
defining a battery pack with the highest temperature in a plurality of battery packs of a third battery string as a third battery pack, and marking the corresponding temperature as the third highest temperature;
when the third maximum temperature is less than or equal to a first preset temperature, acquiring a thermal operation instruction that a cooling device corresponding to the third battery pack does not need to cool the battery pack;
when the third maximum temperature is higher than the first preset temperature, acquiring a thermal operation instruction for cooling the battery pack by a cooling device corresponding to the third battery pack until the difference between the temperature of the third battery pack and the actual temperature of the third maximum temperature is less than or equal to a preset difference;
when the actual temperature difference value between the temperature of the third battery pack and the third highest temperature is less than or equal to a preset difference value, judging whether the temperature of the third battery pack is greater than a second preset temperature, wherein the second preset temperature is less than the first preset temperature;
when the temperature of the third battery pack is less than or equal to a second preset temperature, acquiring a thermal operation instruction of a cooling device corresponding to the third battery pack for stopping cooling the battery pack;
when the temperature of the third battery pack is higher than a second preset temperature, acquiring a thermal operation instruction of a cooling device corresponding to the third battery pack for keeping the temperature of the battery pack to be reduced;
......
defining a battery pack with the highest temperature in a plurality of battery packs of the Nth battery string as an Nth battery pack, and marking the temperature corresponding to the battery pack as the Nth highest temperature;
when the Nth highest temperature is less than or equal to a first preset temperature, acquiring a thermal operation instruction that a cooling device corresponding to the Nth battery pack does not need to cool the battery pack;
when the Nth highest temperature is larger than a first preset temperature, acquiring a thermal operation instruction for cooling the battery pack by a cooling device corresponding to the Nth battery pack until the difference between the temperature of the Nth battery pack and the actual temperature of the Nth highest temperature is smaller than or equal to a preset difference;
when the actual temperature difference value between the temperature of the Nth battery pack and the Nth highest temperature is less than or equal to a preset difference value, judging whether the temperature of the Nth battery pack is greater than a second preset temperature, wherein the second preset temperature is less than the first preset temperature;
when the temperature of the Nth battery pack is less than or equal to a second preset temperature, acquiring a thermal operation instruction of a cooling device corresponding to the Nth battery pack for stopping cooling the battery pack;
and when the temperature of the Nth battery pack is higher than a second preset temperature, acquiring a thermal operation instruction for keeping the temperature reduction of the battery pack by a temperature reduction device corresponding to the Nth battery pack.
2. The battery system thermal management method according to claim 1, wherein the controlling, according to the thermal operation instruction, a temperature reduction device corresponding to the battery string to reduce the temperature of the battery pack in the battery string comprises:
controlling a cooling device corresponding to the battery pack to be turned on from off according to the thermal operation instruction;
judging whether the time interval from the closing to the opening of the cooling device is greater than a first time period or not;
if the time interval from closing to opening of the cooling device is less than a first time period, the cooling device maintains a closing state;
and if the time interval from closing to opening of the cooling device is greater than a first time period, the cooling device is opened.
3. The battery system thermal management method according to claim 1, wherein the controlling a temperature reduction device corresponding to the battery string to reduce the temperature of the battery pack in the battery string according to the thermal operation instruction further comprises:
controlling a cooling device corresponding to the battery pack to be switched on or switched off according to the thermal operation instruction;
judging whether the time interval from the opening to the closing of the cooling device is greater than a second time period or not;
if the time interval from the opening to the closing of the cooling device is less than a second time period, the cooling device maintains the opening state;
and if the time interval from closing to opening of the cooling device is greater than a second time period, closing the cooling device.
4. A non-transitory computer readable storage medium having stored thereon a computer program, wherein the program, when executed by a processor, implements the battery system thermal management method according to any of claims 1-3.
5. A battery system thermal management device for implementing the battery system thermal management method of claim 1, the battery system thermal management device comprising:
the battery management units are used for detecting the state information of each battery pack in the battery packs;
the battery electronic control unit is respectively electrically connected with the battery management units and is used for receiving state information of each battery pack in the battery packs, acquiring state information of a plurality of battery strings in a battery system, wherein the state information comprises temperature information of each battery string, and generating a thermal operation instruction according to the temperature information of the battery strings;
the temperature reduction device control unit is electrically connected with the battery electric control unit and controls the temperature reduction device corresponding to the battery string to reduce the temperature of the battery pack in the battery string according to the thermal operation instruction;
a plurality of temperature reduction devices, one side of each battery pack is provided with one temperature reduction device, and each temperature reduction device is electrically connected with the temperature reduction device control unit and is used for carrying out thermal operation on the battery pack in the battery system,
the acquiring of the state information of a plurality of battery strings in the battery system, wherein the state information includes temperature information of each battery string, includes:
obtaining the highest temperature of a plurality of battery packs in the first battery string, and marking the highest temperature as a first highest temperature;
obtaining the highest temperature of a plurality of battery packs in the second battery string, and marking the highest temperature as a second highest temperature;
obtaining the highest temperature of a plurality of battery packs in the third battery string, and marking the highest temperature as a third highest temperature;
......
and acquiring the highest temperature of a plurality of battery packs in the Nth battery string, and marking as the Nth highest temperature.
6. The battery system thermal management apparatus of claim 5, wherein each of said battery management units comprises:
the monitoring module is used for acquiring the state information of each battery pack in the plurality of battery packs;
and the control module is used for sending the state information of each battery pack acquired by the monitoring module to the battery electric control unit.
7. The battery system thermal management apparatus of claim 5, wherein the temperature reduction device is a fan, and the fan comprises a motor and at least one fan blade.
8. The battery system thermal management apparatus of claim 7, wherein a motor of the fan is configured to run at a variable speed.
9. A battery system comprising a battery system thermal management apparatus according to any one of claims 5 to 8.
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| CN113611927A (en) * | 2021-07-30 | 2021-11-05 | 蜂巢能源科技有限公司 | Energy storage battery cluster system and thermal management method |
| CN113611946A (en) * | 2021-07-30 | 2021-11-05 | 蜂巢能源科技有限公司 | Thermal management method and device for energy storage battery cluster |
| CN115657749B (en) * | 2022-09-07 | 2024-05-03 | 北京燕开新源科技有限公司 | Temperature control method, temperature control device, energy storage system, computer equipment and storage medium |
| CN115733209A (en) * | 2022-11-07 | 2023-03-03 | 苏州融硅新能源科技有限公司 | Control method of battery system, battery system and battery management system |
| CN117352913B (en) * | 2023-12-05 | 2024-04-19 | 承德神奥新能源科技有限公司 | Battery pack management method and system |
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