CN117317406A - Health monitoring method, controller and system of liquid cooling energy storage device - Google Patents

Health monitoring method, controller and system of liquid cooling energy storage device Download PDF

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Publication number
CN117317406A
CN117317406A CN202311117964.XA CN202311117964A CN117317406A CN 117317406 A CN117317406 A CN 117317406A CN 202311117964 A CN202311117964 A CN 202311117964A CN 117317406 A CN117317406 A CN 117317406A
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China
Prior art keywords
liquid cooling
liquid
energy storage
value
temperature
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CN202311117964.XA
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高海
牛晓林
张磊
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Shuangyili Ningbo Battery Co ltd
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Shuangyili Ningbo Battery Co ltd
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Priority to CN202311117964.XA priority Critical patent/CN117317406A/en
Publication of CN117317406A publication Critical patent/CN117317406A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/4228—Leak testing of cells or batteries
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D21/00—Measuring or testing not otherwise provided for
    • G01D21/02—Measuring two or more variables by means not covered by a single other subclass
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/389—Measuring internal impedance, internal conductance or related variables
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/392—Determining battery ageing or deterioration, e.g. state of health
    • 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
    • H01M10/4285—Testing apparatus
    • 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
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/613—Cooling or keeping cold
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/655—Solid structures for heat exchange or heat conduction
    • H01M10/6556—Solid parts with flow channel passages or pipes for heat exchange
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/656—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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Secondary Cells (AREA)

Abstract

The application relates to the technical field of energy storage equipment, and provides a health monitoring method, a controller and a system of a liquid cooling energy storage device, wherein the method comprises the following steps: acquiring operation parameters of the liquid cooling structure and state parameters of the energy storage battery; the operation parameters of the liquid cooling structure comprise a pressure difference value and a temperature difference value of the liquid cooling structure; determining the average flow of the cooling liquid flowing through the liquid cooling structure in unit time according to the pressure difference value; determining an internal resistance difference value of the energy storage battery according to the average flow, the temperature difference value and the state parameter of the energy storage battery; determining a health monitoring result of the liquid cooling energy storage device according to the average flow and the internal resistance difference value; the health monitoring result comprises leakage information of the liquid cooling structure and aging degree of the energy storage battery; the leakage position of the liquid cooling structure can be accurately determined, the aging degree of the energy storage battery can be evaluated, and then the economic loss and the monitoring cost can be correspondingly reduced.

Description

Health monitoring method, controller and system of liquid cooling energy storage device
Technical Field
The application relates to the technical field of energy storage equipment, in particular to a health monitoring method, a controller and a system of a liquid cooling energy storage device.
Background
In the liquid cooling energy storage system, the cooling liquid mainly prepared by the liquid cooling unit circularly flows in a cooling pipeline and a cooling structure to take away heat generated by the operation of the energy storage battery, thereby realizing the cooling of the energy storage battery. The health running condition of the liquid cooling energy storage device is mainly represented by two factors, namely leakage information of cooling liquid and aging degree of an energy storage battery.
In the related art, a gas sensor is additionally arranged between a cooling liquid container and a battery pack shell, so that the gas concentration corresponding to an odor agent in cooling liquid between the cooling liquid container and the battery pack shell is detected through the gas sensor, and whether the cooling liquid leaks or not is judged. And when the aging degree of the energy storage battery is estimated, the energy storage battery is taken out of operation and isolated independently, and then the aging degree of the energy storage battery is estimated by an estimation device.
However, the inventors consider that in the above-described monitoring scheme of the liquid-cooled energy storage device: the gas concentration detected by the gas sensor is directly related to the distance between the leakage points, so that the scheme for detecting the leakage of the cooling liquid has the problems of inaccurate and untimely detection; and the aging degree evaluation scheme which needs the energy storage battery to exit the operation can not only influence the input rate of the energy storage battery, but also be limited by evaluation equipment, so that the evaluation of the aging degree of the battery is not accurate enough, and in addition, the two different monitoring methods adopted for the liquid cooling energy storage device further increase the economic loss and the monitoring cost.
Disclosure of Invention
One or more embodiments of the present application provide a health monitoring method of a liquid cooling energy storage device, so as to solve or at least partially alleviate the problems of the related art that leakage information of a cooling liquid and ageing degree detection of an energy storage battery are inaccurate, and the input rate of the energy storage battery is affected, thereby causing economic loss and increased monitoring cost.
In a first aspect, the present application provides a method for health monitoring of a liquid-cooled energy storage device, including:
acquiring operation parameters of the liquid cooling structure and state parameters of the energy storage battery; the operation parameters of the liquid cooling structure comprise a pressure difference value and a temperature difference value of the liquid cooling structure;
determining the average flow rate of the cooling liquid flowing through the liquid cooling structure in unit time according to the differential pressure value;
determining an internal resistance difference value of the energy storage battery according to the average flow, the temperature difference value and the state parameter of the energy storage battery;
determining a health monitoring result of the liquid cooling energy storage device according to the average flow and the internal resistance difference value; the health monitoring result comprises leakage information of the liquid cooling structure and aging degree of the energy storage battery.
In one embodiment, determining the average flow rate of the cooling liquid flowing through the liquid cooling structure in a unit time according to the differential pressure value includes:
And comparing the pressure difference flow curve of the liquid cooling structure according to the pressure difference value of the liquid cooling structure to determine the average flow of the cooling liquid flowing through the liquid cooling structure in unit time.
In one embodiment, the liquid cooling structure comprises a plurality of liquid cooling plates; the differential pressure value of the liquid cooling structure comprises a first differential pressure value of the liquid cooling plate, and the differential pressure flow curve comprises a first differential pressure flow curve of the liquid cooling plate; the average flow comprises a first average flow of the liquid cooling plate;
according to the average flow and the internal resistance difference value, determining the health monitoring result of the liquid cooling energy storage device comprises the following steps:
determining a first average flow of the cooling liquid flowing through the liquid cooling plate in unit time according to the first pressure difference value of the liquid cooling plate and a first pressure difference flow curve of the liquid cooling plate;
and determining leakage information of the liquid cooling plate according to a comparison result of the first average flow and the flow preset value of the liquid cooling plate.
In one embodiment, the liquid cooling structure comprises a liquid cooling component, the differential pressure value of the liquid cooling structure comprises a second differential pressure value of the liquid cooling component, and the differential pressure flow curve comprises a second differential pressure flow curve of the liquid cooling component; the average flow rate comprises a first average flow rate of the liquid cooling assembly;
According to the average flow and the internal resistance difference value, determining the health monitoring result of the liquid cooling energy storage device comprises the following steps:
determining a second average flow rate of the cooling liquid flowing through the liquid cooling assembly in unit time according to the second pressure difference value of the liquid cooling assembly and a second pressure difference flow rate curve of the liquid cooling assembly;
and determining leakage information of the liquid cooling assembly according to a comparison result of the second average flow and the flow preset value of the liquid cooling assembly.
In one embodiment, the liquid cooling structure comprises a liquid cooling assembly, the liquid cooling assembly comprises a plurality of liquid cooling plates, the energy storage battery comprises a battery cluster, the battery cluster comprises a plurality of battery packs, and the liquid cooling plates are connected with the battery packs; the average flow rate comprises a first average flow rate of the liquid cooling plate; the temperature difference value of the liquid cooling structure comprises a first temperature difference value of the liquid cooling plate, and the state parameters of the energy storage battery comprise the temperature rise rate, the working voltage value and the initial internal resistance value of the battery pack;
determining the internal resistance difference value of the energy storage battery according to the average flow, the temperature difference value and the state parameter of the energy storage battery comprises:
Determining the refrigerating capacity of the liquid cooling plate to the battery pack according to the first average flow and the first temperature difference value of the liquid cooling plate and the specific heat capacity of the cooling liquid; the first temperature difference value is a difference value between the temperature of the liquid inlet end and the temperature of the liquid outlet end of the liquid cooling plate;
determining the heating value of the battery pack according to the temperature rise rate of the battery pack, the mass of the battery pack and the specific heat capacity of the battery pack;
determining an average internal resistance value of the battery pack according to the refrigerating capacity of the battery pack, the heating value of the battery pack and the working voltage value of the battery pack;
and determining an internal resistance difference value of the battery pack according to the average internal resistance value of the battery pack and the initial internal resistance value of the battery pack.
In one embodiment, determining the health monitoring result of the liquid cooling energy storage device according to the average flow and the internal resistance difference value further includes:
and evaluating the aging degree of the battery pack according to the comparison result of the internal resistance difference value of the battery pack and the internal resistance difference values of other battery packs.
In one embodiment, the state parameter of the energy storage battery further includes a temperature difference value of the battery cluster; the temperature difference value of the battery cluster is the difference value of the maximum temperature threshold value and the minimum temperature threshold value of each battery pack;
According to the average flow and the internal resistance difference value, determining the health monitoring result of the liquid cooling energy storage device further comprises:
judging whether to enter an aging degree control mode of the battery packs according to whether the aging degree of each battery pack is inconsistent or not or according to a comparison result of the temperature difference value of the battery cluster and the temperature preset value of the battery pack;
when the aging degree control mode of the battery pack is entered, the flow rate of the cooling liquid entering the liquid cooling plate corresponding to the battery pack is adjusted according to the internal resistance difference value of the battery pack.
In one embodiment, the temperature difference value of the liquid cooling structure further comprises a second temperature difference value of a liquid cooling assembly; the second temperature difference value is a difference value between the temperature of the liquid inlet end and the temperature of the liquid outlet end of the liquid cooling assembly;
according to the average flow and the internal resistance difference value, determining the health monitoring result of the liquid cooling energy storage device further comprises:
and constructing a corresponding relation between the internal resistance difference value of the battery pack and the temperature difference of the liquid cooling assembly according to the internal resistance difference value of the battery pack and the second temperature difference value of the liquid cooling assembly.
Compared with the prior art, one or more embodiments of the present application include at least one of the following beneficial technical effects:
The average flow rate of the cooling liquid flowing in the liquid cooling structure in unit time can be determined firstly according to the pressure difference value of the liquid cooling structure by acquiring the operation parameters of the liquid cooling structure and the state parameters of the energy storage battery; and then, the leakage information of the liquid cooling structure in the health monitoring result can be determined according to the average flow of the liquid cooling structure, so that the position information of the leakage of the cooling liquid in the liquid cooling structure can be accurately judged.
The internal resistance difference value of the energy storage battery can be determined according to the average flow of the liquid cooling structure, the temperature difference value and the state parameter of the energy storage battery, and finally the aging degree of the energy storage battery can be accurately estimated according to the internal resistance difference value of the energy storage battery and a parameter basis is provided for solving the aging inconsistency of the energy storage battery.
In other words, through the real-time online monitoring of the operation parameters of the liquid cooling structure and the state parameters of the energy storage battery in the steps, the leakage position of the liquid cooling structure can be accurately and timely determined, the loss degree caused by system shutdown inspection is reduced, the aging degree of the energy storage battery can be accurately estimated according to the internal resistance change of the energy storage battery monitored in real time online, the input rate of the energy storage battery is ensured, and the economic loss and the monitoring cost are correspondingly reduced.
In a second aspect of the present application, a controller is provided, which adopts the following technical scheme: a controller comprising a processor, a memory, and computer program instructions stored on the memory and executable on the processor, which when executed by the processor is operable to implement a method of health monitoring a liquid cooled energy storage device as described above.
Therefore, the processor in the controller is used for realizing the health monitoring method of the liquid cooling energy storage device when executing the computer program instructions, so that the controller has all technical effects of the health monitoring method of the liquid cooling energy storage device, and the description is omitted herein.
In a third aspect of the application, a liquid cooling energy storage system is provided, including the controller as described above, and further including a liquid cooling unit, a cooling pipeline, a first detection component, and a liquid cooling energy storage device, where the liquid cooling energy storage device includes an energy storage battery and a liquid cooling structure, the liquid cooling unit is communicated with the liquid cooling structure through the cooling pipeline, and the liquid cooling structure is connected with the energy storage battery; the first detection component is arranged on the cooling pipeline and is used for detecting the pressure difference value and the temperature difference value of the cooling liquid flowing through the liquid cooling structure.
Therefore, the liquid cooling energy storage system at least comprises the controller, so the liquid cooling energy storage system at least has all technical effects of the controller and is not described herein.
In one embodiment, the liquid cooling energy storage system further comprises an electromagnetic valve, the liquid cooling structure comprises a liquid cooling assembly, the liquid cooling assembly comprises a plurality of liquid cooling plates, the energy storage battery comprises a battery cluster, the battery cluster comprises a plurality of battery packs, the liquid cooling plates are connected with the battery packs, and the first detection assembly comprises a first temperature pressure detection device and a second temperature pressure detection device; the liquid cooling plate is provided with a first liquid inlet and a first liquid outlet, and the liquid cooling assembly is provided with a second liquid inlet and a second liquid outlet;
the first temperature and pressure detection device is used for detecting the temperature and pressure value of the first liquid inlet and the temperature and pressure value of the first liquid outlet, the second temperature and pressure detection device is used for detecting the temperature and pressure value of the second liquid inlet and the temperature and pressure value of the second liquid outlet, the electromagnetic valve is arranged on a pipeline between the liquid cooling unit and the first liquid inlet, and the controller is used for controlling the opening degree of the electromagnetic valve according to the detection values of the first temperature and pressure detection device and the second temperature and pressure detection device.
Drawings
FIG. 1 is a schematic diagram of a liquid-cooled energy storage system according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram illustrating a control principle of a liquid-cooled energy storage system according to an embodiment of the present disclosure;
FIG. 3 is an overall flowchart of a method for monitoring health of a liquid-cooled energy storage device according to an embodiment of the present disclosure;
fig. 4 is a flow chart of monitoring leakage information of a liquid cooling plate in the embodiment of the application;
FIG. 5 is a flow chart of monitoring leakage information of a liquid cooling assembly according to an embodiment of the present application;
FIG. 6 is a flow chart of monitoring the internal resistance difference of the energy storage battery according to an embodiment of the present application;
fig. 7 is a flowchart of controlling the aging degree of the energy storage battery in the embodiment of the present application.
Reference numerals illustrate:
1-a liquid cooling unit; 2-battery pack; 3-liquid cooling plate; 41-a first liquid inlet pipe; 42-a first liquid outlet pipe; 43-a second liquid inlet pipe; 44-a second outlet pipe; 51-a first temperature-pressure detecting device; 52-a second temperature-pressure detection device; 6-an electromagnetic valve; 7-a controller.
Detailed Description
In the related art, the liquid cooling energy storage system mainly comprises a liquid cooling unit, a cooling pipeline and a liquid cooling energy storage device, wherein the liquid cooling energy storage device comprises an energy storage battery and a liquid cooling structure, the cooling pipeline comprises a liquid inlet pipe and a liquid outlet pipe, a liquid outlet end of the liquid cooling unit is communicated with a liquid inlet of the liquid cooling structure through the liquid inlet pipe, the liquid cooling structure is connected with the energy storage battery, a liquid outlet of the liquid cooling structure is communicated with a liquid return end of the liquid cooling unit through the liquid outlet pipe, so that cooling liquid prepared by the liquid cooling unit circularly flows in the cooling pipeline and the cooling structure to take away heat generated by the operation of the energy storage battery, and cooling of the energy storage battery is realized. The health running condition of the liquid cooling energy storage device is mainly represented by two factors, namely leakage information of cooling liquid and aging degree of an energy storage battery.
If the leakage problem occurs in the circulation process of the cooling liquid, accidents such as rusting, battery short circuit, battery damage and explosion of the battery can be caused by the leaked cooling liquid, so that the safe operation of a single battery or the whole liquid cooling energy storage system can be influenced; in the related art, leakage information of the cooling liquid is detected mainly by the following scheme, specifically: the odor agent is dissolved in the cooling liquid container, the cooling liquid container is positioned in the battery pack shell, and the gas sensor is arranged between the cooling liquid container and the battery pack shell so as to detect the gas concentration corresponding to the odor agent in the region between the cooling liquid and the battery pack shell easily through the gas sensor, so that whether the problem of leakage of the cooling liquid exists or not is judged. In addition, for the evaluation of the degree of aging of the energy storage battery, it is usual to take the energy storage battery out of operation and isolate it separately, and then evaluate it by an evaluation device.
However, the gas concentration detected by the gas sensor is directly related to the distance between the leakage points, so that the scheme for detecting the leakage of the cooling liquid has the problems of inaccurate and untimely detection; and the aging degree evaluation scheme which needs the energy storage battery to exit the operation can not only influence the input rate of the energy storage battery, but also be limited by evaluation equipment, so that the evaluation of the aging degree of the battery is not accurate enough, and in addition, the two different monitoring methods adopted for the liquid cooling energy storage device further increase the economic loss and the monitoring cost.
In order to make the above objects, features and advantages of the present application more comprehensible, embodiments accompanied with figures are described in detail below.
It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the present application described herein may be implemented in sequences other than those illustrated or otherwise described herein.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; may be a mechanical connection; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.
In the description of the present specification, the descriptions of the terms "embodiment," "one embodiment," and the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or embodiment is included in at least one embodiment or implementation of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same examples or implementations. Furthermore, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or implementations.
FIG. 1 is a schematic diagram of a liquid-cooled energy storage system according to an embodiment of the present disclosure; fig. 2 is a schematic diagram of a control principle of a liquid-cooled energy storage system according to an embodiment of the present application.
One or more embodiments of the present application disclose a liquid cooling energy storage system, referring to fig. 1 and 2, the liquid cooling energy storage system includes a controller 7, and further includes a liquid cooling unit 1, a cooling pipeline, a first detection component, and a liquid cooling energy storage device, where the liquid cooling energy storage device includes an energy storage battery and a liquid cooling structure, the liquid cooling unit 1 is communicated with the liquid cooling structure through the cooling pipeline, and the liquid cooling structure is connected with the energy storage battery; the first detection component is arranged on the cooling pipeline and is used for detecting the pressure difference value and the temperature difference value of the cooling liquid flowing through the liquid cooling structure.
In at least one embodiment, the liquid cooling unit 1 is configured to output a low-temperature cooling liquid and cool and output a high-temperature cooling liquid that absorbs heat of the energy storage battery again; the cooling pipeline is used for conveying cooling liquid.
Specifically, when the energy storage battery is cooled, the liquid outlet end of the liquid cooling unit 1 can convey cooling liquid into the liquid cooling structure through a cooling pipeline and continuously circulate in the liquid cooling structure, and the liquid cooling structure is connected with the energy storage battery, so that the cooling liquid in the liquid cooling structure can absorb heat generated by the operation of the energy storage battery, the temperature of the energy storage battery is reduced, and the cooling operation of the energy storage battery is further realized; the first detection assembly is arranged on the cooling pipeline and used for detecting the pressure difference value and the temperature difference value flowing through the liquid cooling structure, so that an early parameter basis is provided for the follow-up judgment of the leakage information and the aging degree of the cooling liquid.
In some embodiments, as shown in connection with fig. 1 and 2, the liquid-cooled energy storage system further includes a solenoid valve 6, the liquid-cooled structure includes a liquid-cooled assembly including a plurality of liquid-cooled plates 3, the energy storage battery includes a battery cluster including a plurality of battery packs 2, the liquid-cooled plates 3 are connected with the battery packs 2, and the first detection assembly includes a first temperature-pressure detection device 51 and a second temperature-pressure detection device 52; the liquid cooling plate 3 is provided with a first liquid inlet and a first liquid outlet, and the liquid cooling assembly is provided with a second liquid inlet and a second liquid outlet.
The first temperature and pressure detection device 51 is arranged on the cooling pipeline and is used for detecting the temperature and pressure value of the first liquid inlet and the temperature and pressure value of the first liquid outlet, the second temperature and pressure detection device 52 is arranged on the cooling pipeline and is used for detecting the temperature and pressure value of the second liquid inlet and the temperature and pressure value of the second liquid outlet, the electromagnetic valve 6 is arranged on the pipeline between the liquid cooling unit 1 and the first liquid inlet, and the controller 7 is used for controlling the opening degree of the electromagnetic valve 6 according to the detection values of the first temperature and pressure detection device 51 and the second temperature and pressure detection device 52.
In at least one embodiment, a first temperature and pressure detecting device 51 may be disposed at a first liquid inlet and a first liquid outlet corresponding to the liquid cooling plate 3, and a second temperature and pressure detecting device 52 may be disposed at a second liquid inlet and a second liquid outlet corresponding to the liquid cooling assembly. The cooling pipeline comprises a first liquid inlet pipe 41, a first liquid outlet pipe 42, a second liquid inlet pipe 43 and a second liquid outlet pipe 44, a liquid outlet of the liquid cooling unit 1 is communicated with the second liquid inlet pipe 43, one ends of a plurality of first liquid inlet pipes 41 are respectively communicated with the second liquid inlet pipe 43, the other ends of the first liquid inlet pipes 41 are communicated with the first liquid outlet pipe 42 through the liquid cooling plate 3, a plurality of first liquid outlet pipes 42 are respectively communicated with the second liquid outlet pipe 44, and the second liquid outlet pipe 44 is communicated with a liquid return port of the liquid cooling unit 1; the two first temperature and pressure detection devices 51 may be disposed on the first liquid inlet pipe 41 and the first liquid outlet pipe 42, the two second temperature and pressure detection devices 52 may be disposed on the second liquid inlet pipe 43 and the second liquid outlet pipe 44, the electromagnetic valve 6 is disposed on the first liquid inlet pipe 41, and the controller 7 is configured to control the opening of the electromagnetic valve 6 according to the detection values of the first temperature and pressure detection devices 51 and the second temperature and pressure detection devices 52, so as to control the flow rate of the cooling liquid entering the liquid cooling plate 3 output by the liquid cooling unit 1.
In at least one embodiment, the number of clusters in the energy storage cell is at least one and the number of liquid cooled components in the liquid cooled structure is at least one. Referring to fig. 1, the number of battery clusters and the number of liquid cooling assemblies are taken as one, where the battery clusters may include a plurality of battery packs 2 stacked and disposed, and similarly, the liquid cooling assemblies may include a plurality of liquid cooling plates 3, and the liquid cooling plates 3 and the battery packs 2 may be connected in a contact manner. The liquid cooling unit 1 can be a liquid cooling air conditioner; the tip of liquid cooling board 3 is equipped with inlet and liquid outlet, and the inside of liquid cooling board 3 is equipped with the runner, and the runner communicates with inlet and liquid outlet respectively.
Specifically, the liquid cooling unit 1, the cooling pipeline and the liquid cooling plate 3 may be in a communication manner, for example, the low-temperature cooling liquid output from the liquid outlet end of the liquid cooling unit 1 is first introduced into the second liquid inlet pipe 43, then the cooling liquid in the second liquid inlet pipe 43 is split to enter each first liquid inlet pipe 41, then the cooling liquid in each first liquid inlet pipe 41 enters from the liquid inlet of the liquid cooling plate 3, is discharged from the liquid outlet of the liquid cooling plate 3 after the circulation of the runner in the liquid cooling plate 3 to enter the first liquid outlet pipe 42, then the cooling liquid in each first liquid outlet pipe 42 is converged in the second liquid outlet pipe 44, and flows back to the interior of the liquid cooling unit 1 through the second liquid outlet pipe 44, so that the cooling liquid in the liquid cooling unit 1, the cooling pipeline and the liquid cooling plate 3 is continuously circulated, and the cooling operation of the battery pack 2 is correspondingly realized due to the contact connection of the liquid cooling plate 3 and the battery pack 2.
As shown in fig. 1, two first temperature and pressure detection devices 51 may be disposed on the first liquid inlet pipe 41 and the first liquid outlet pipe 42, for example, the first temperature and pressure detection devices 51 may be temperature and pressure integrated sensors, where one first temperature and pressure detection device 51 is used for detecting a temperature value and a pressure value of the cooling liquid in the first liquid inlet pipe 41, and may be used as a temperature value and a pressure value of the cooling liquid at a liquid inlet end (a first liquid inlet) of the liquid cooling plate 3; the other first temperature and pressure detecting device 51 is configured to detect a temperature value and a pressure value of the cooling liquid in the first liquid outlet pipe 42, and may be used as a temperature value and a pressure value of the cooling liquid at a liquid outlet end (first liquid outlet) of the liquid cooling plate 3, where the difference between the temperature value and the pressure value acquired by the first temperature and pressure detecting device 51 disposed on the first liquid inlet pipe 41 and the temperature value and the pressure value acquired by the other first temperature and pressure detecting device 51 disposed on the first liquid outlet pipe 42 is made, so as to obtain a first temperature difference and a first pressure difference of the liquid cooling plate 3, where the first temperature difference is a difference between a liquid inlet end temperature and a liquid outlet end temperature of the liquid cooling plate 3, and the first pressure difference is a difference between a liquid inlet end pressure and a liquid outlet end pressure of the liquid cooling plate 3.
The two second temperature and pressure detection devices 52 may be disposed on the second liquid inlet pipe 43 and the second liquid outlet pipe 44, for example, the second temperature and pressure detection devices 52 may be temperature and pressure integrated sensors, where one second temperature and pressure detection device 52 is configured to detect a temperature value and a pressure value of the cooling liquid in the second liquid inlet pipe 43, and may be used as a temperature value and a pressure value of the cooling liquid at a liquid inlet end (a second liquid inlet) of the liquid cooling assembly; the other second temperature and pressure detecting device 52 is configured to detect a temperature value and a pressure value of the cooling liquid in the second liquid outlet pipe 44, and may be used as a temperature value and a pressure value of the cooling liquid at a liquid outlet end (second liquid outlet) of the liquid cooling assembly, where the temperature value and the pressure value acquired by one second temperature and pressure detecting device 52 disposed on the second liquid inlet pipe 43 and the temperature value and the pressure value acquired by the other second temperature and pressure detecting device 52 disposed on the second liquid outlet pipe 44 are respectively different, so as to obtain a second temperature difference value and a second pressure difference value of the liquid cooling assembly, where the second temperature difference value is a difference value between a liquid inlet end temperature and a liquid outlet end temperature of the liquid cooling assembly, and the second pressure difference value is a difference value between a liquid inlet end pressure and a liquid outlet end pressure of the liquid cooling assembly.
Specifically, as shown in fig. 2, the first temperature and pressure detecting device 51 and the second temperature and pressure detecting device 52 are respectively electrically connected to the signal receiving end of the controller 7, and the control end of the controller 7 is electrically connected to the solenoid valve 6 provided on each second liquid inlet pipe 43, so that according to the detected values of the first temperature and pressure detecting device 51 and the second temperature and pressure detecting device 52, the opening degree of the solenoid valve 6 can be controlled, and the flow rate of the coolant conveyed to the liquid cooling plate 3 in the second liquid inlet pipe 43 can be controlled, so that the aging degree of the battery pack 2 can be reduced.
Fig. 3 is an overall flowchart of a method for monitoring health of a liquid-cooled energy storage device according to an embodiment of the present application.
Referring to fig. 3, one or more embodiments of the present application disclose a health monitoring method of a liquid-cooled energy storage device, including the steps of:
s200, acquiring operation parameters of the liquid cooling structure and state parameters of the energy storage battery; the operation parameters of the liquid cooling structure comprise a pressure difference value and a temperature difference value of the liquid cooling structure;
s400, determining the average flow rate of the cooling liquid flowing through the liquid cooling structure in unit time according to the differential pressure value;
s600, determining an internal resistance difference value of the energy storage battery according to the average flow, the temperature difference value and the state parameter of the energy storage battery;
S800, determining a health monitoring result of the liquid cooling energy storage device according to the average flow and the internal resistance difference value; the health monitoring result comprises leakage information of the liquid cooling structure and aging degree of the energy storage battery.
In at least one embodiment, in step S200, the first temperature-pressure detecting device 51 and the second temperature-pressure detecting device 52 may detect a differential pressure value and a temperature difference value in the operation parameters of the cooling liquid flowing through the liquid cooling structure, where the differential pressure value of the liquid cooling structure may be a differential pressure between the pressure of the liquid inlet end of the cooling liquid flowing through the liquid cooling structure and the pressure of the liquid outlet end of the liquid cooling structure, the differential temperature value of the liquid cooling structure may be a differential pressure between the temperature of the liquid inlet end of the cooling liquid flowing through the liquid cooling structure and the temperature of the liquid outlet end of the liquid cooling structure, and the differential pressure value of the liquid cooling structure may provide a parameter basis for subsequently judging leakage information of the cooling liquid; the temperature difference value of the liquid cooling structure provides a parameter basis of the bottom layer for the subsequent evaluation of the aging degree of the energy storage battery.
In step S400, according to the pressure difference value of the liquid cooling structure, the average flow rate of the cooling liquid flowing through the liquid cooling structure in a unit time when the liquid cooling energy storage device is in stable operation can be determined, and the average flow rate can be used as a key parameter for judging leakage information of the cooling liquid subsequently, and can also be used as one of key parameters for reflecting the refrigeration effect of the liquid cooling structure on the energy storage battery, so that a parameter basis is provided for calculation of the internal resistance difference value of the subsequent energy storage battery and evaluation and control of the aging degree of the energy storage battery.
In step S600, the average flow, the temperature difference value and the state parameter of the energy storage battery of the cooling liquid flowing through the liquid cooling structure can be used for collecting the above parameters in real time in the state of on-line operation of the energy storage battery, so that the internal resistance difference value of the energy storage battery after a period of operation can be accurately determined, the internal resistance difference value can reflect the current internal resistance value of the energy storage battery and the variation of the initial internal resistance value when leaving a factory, and can be used as the most intuitive data for evaluating the aging degree of the energy storage battery.
In step S800, the leakage information of the liquid cooling structure and the aging degree of the energy storage battery in the liquid cooling energy storage device can be accurately determined at the same time by the average flow of the liquid cooling structure and the internal resistance difference of the energy storage battery, so that the economic loss and the monitoring cost are correspondingly reduced.
In some embodiments, S400, determining, according to the differential pressure value, an average flow rate of the cooling liquid flowing through the liquid cooling structure in a unit time includes:
and comparing the pressure difference flow curve of the liquid cooling structure according to the pressure difference value of the liquid cooling structure to determine the average flow of the cooling liquid flowing through the liquid cooling structure in unit time.
In at least one embodiment, the differential pressure value of the liquid cooling structure may be the difference between the pressure of the liquid inlet end of the coolant flowing through the liquid cooling structure and the pressure at the liquid outlet end of the liquid cooling structure; the differential pressure flow curve of the liquid cooling structure can be obtained through a large number of tests in a laboratory in the research and development stage, and can also be obtained through simulation; the pressure difference flow curve is a curve formed by flow values corresponding to the pressure difference values of the cooling liquid flowing through the liquid cooling structure, so that after the pressure difference values of the liquid cooling structure are obtained, the pressure difference values can be compared with the pressure difference flow curve of the liquid cooling structure according to the pressure difference values of the liquid cooling structure, and the average flow rate of the cooling liquid flowing through the liquid cooling structure in unit time in the operation stage of the liquid cooling energy storage device can be determined.
In some embodiments, the liquid cooling structure comprises a plurality of liquid cooling plates 3; the differential pressure value of the liquid cooling structure comprises a first differential pressure value of the liquid cooling plate 3, and the differential pressure flow curve comprises a first differential pressure flow curve of the liquid cooling plate 3; the average flow rate includes a first average flow rate of the liquid cooling plate 3;
fig. 4 is a flowchart of monitoring leakage information of a liquid cooling plate in the embodiment of the present application.
Referring to fig. 4, S800, determining, according to the average flow and the internal resistance difference, a health monitoring result of the liquid cooling energy storage device includes:
s811, determining a first average flow rate of the cooling liquid flowing through the liquid cooling plate 3 in unit time according to the first differential pressure value of the liquid cooling plate 3 and a first differential pressure flow rate curve of the liquid cooling plate 3;
s812, determining leakage information of the liquid cooling plate 3 according to a comparison result of the first average flow and the flow preset value of the liquid cooling plate 3.
In at least one embodiment, the first differential pressure value is a difference value between a liquid inlet end pressure and a liquid outlet end pressure of the cooling liquid in the liquid cooling plate 3, and the first differential pressure flow curve is a curve formed by flow values corresponding to differential pressure values of the cooling liquid flowing through the liquid cooling plate 3; the first pressure difference value of the liquid cooling plate 3 may be the difference value between the pressure of the liquid inlet end of the cooling liquid flowing through the liquid cooling plate 3 and the pressure of the liquid outlet end of the liquid cooling plate 3; the first differential pressure flow rate curve of the liquid cooling plate 3 may be a curve formed by flow rate values corresponding to differential pressure values of the cooling liquid flowing through the liquid cooling plate 3. The flow preset value of the liquid cooling plate 3 may be a normal flow range of the cooling liquid flowing through the liquid cooling plate 3.
Taking each liquid cooling plate 3 with a liquid cooling structure as a detection object as an example, in step S811, referring to fig. 1, in a loop where a certain liquid cooling plate 3 is located, two first temperature and pressure detection devices 51 disposed on the first liquid inlet pipe 41 and the first liquid outlet pipe 42 may be used to perform a difference between the detected difference between the liquid inlet end pressure and the liquid outlet end pressure of the liquid cooling plate 3, so as to obtain a first pressure difference of the liquid cooling plate 3; and then, comparing the first differential pressure value of the liquid cooling plate 3 with a first differential pressure flow curve of the liquid cooling plate 3, so as to determine the first average flow of the cooling liquid flowing through the liquid cooling plate 3 in unit time.
In step S812, the position information of the liquid cooling plate 3 in which the leakage of the cooling liquid occurs can be more accurately determined according to the comparison result of the first average flow rate of the liquid cooling plate 3 and the flow preset value of the liquid cooling plate 3, in other words, if the first average flow rate of the cooling liquid flowing through the liquid cooling plate 3 in a unit time is greater than or equal to the flow preset value of the cooling liquid flowing through the liquid cooling plate 3, it can be determined that the leakage problem of the cooling liquid occurs at the liquid cooling plate 3, and at this moment, the leakage information of the liquid cooling plate 3 includes the position of the liquid cooling plate 3 and the alarm information, wherein the position of the liquid cooling plate 3 can also be directly specific to the specific position of the battery pack 2 corresponding to the position of the liquid cooling plate, so that the maintenance personnel can perform the maintenance operation on the battery pack in time.
In some embodiments, the liquid cooling structure comprises a liquid cooling assembly, the differential pressure value of the liquid cooling structure comprises a second differential pressure value of the liquid cooling assembly, and the differential pressure flow curve comprises a second differential pressure flow curve of the liquid cooling assembly; the average flow rate comprises a first average flow rate of the liquid cooling assembly;
fig. 5 is a flow chart of monitoring leakage information of a liquid cooling assembly in an embodiment of the present application.
Referring to fig. 5, S800, determining, according to the average flow and the internal resistance difference, a health monitoring result of the liquid cooling energy storage device includes:
s821, determining a second average flow rate of the cooling liquid flowing through the liquid cooling assembly in unit time according to the second differential pressure value of the liquid cooling assembly and a second differential pressure flow curve of the liquid cooling assembly;
s822, determining leakage information of the liquid cooling assembly according to a comparison result of the second average flow and a flow preset value of the liquid cooling assembly.
In at least one embodiment, the second differential pressure value is a difference value between a pressure of the cooling liquid at a liquid inlet end and a pressure of the cooling liquid at a liquid outlet end of the liquid cooling assembly, and the second differential pressure flow curve is a curve formed by flow values corresponding to differential pressure values of the cooling liquid flowing through the liquid cooling assembly; the second pressure difference value of the liquid cooling assembly can be the difference value between the pressure of the liquid inlet end of the cooling liquid flowing through the liquid cooling assembly and the pressure of the liquid outlet end of the liquid cooling assembly; the second differential pressure flow curve of the liquid cooling assembly may be a curve formed by flow values corresponding to differential pressure values of the cooling liquid flowing through the liquid cooling assembly. The flow preset value of the liquid cooling assembly can be a normal flow range of the cooling liquid flowing through the liquid cooling assembly.
Taking the liquid cooling component with the liquid cooling structure as the detection object as an example for specific explanation, in step S821, referring to fig. 1, the difference between the liquid inlet end pressure and the liquid outlet end pressure of the liquid cooling component corresponding to the battery cluster can be made by two second temperature and pressure detection devices 52 disposed on the second liquid inlet pipe 43 and the second liquid outlet pipe 44, so as to obtain a second pressure difference of the liquid cooling component; and then comparing the second differential pressure value of the liquid cooling assembly with a second differential pressure flow curve of the liquid cooling assembly, so that the second average flow of the cooling liquid flowing through the whole liquid cooling assembly in unit time can be determined.
In step S822, the position information of the liquid cooling component where the leakage of the cooling liquid occurs can be more accurately determined according to the comparison result of the second average flow rate of the liquid cooling component and the flow preset value of the liquid cooling component, in other words, if the second average flow rate of the cooling liquid flowing through the liquid cooling component in unit time is greater than or equal to the flow preset value of the cooling liquid flowing through the liquid cooling component, the leakage problem of the cooling liquid at the liquid cooling component can be determined, and at this moment, the leakage information of the liquid cooling component includes the position of the liquid cooling component and the alarm information, wherein the position of the liquid cooling component can also be directly specific to the specific position of the battery cluster corresponding to the position of the liquid cooling component, so that the maintenance personnel can maintain the battery cluster in time.
Of course, if the leakage information (alarm and position information) of a certain liquid cooling plate 3 is not outputted at the same time after the leakage information of the liquid cooling module is determined, the controller 7 may prompt that the leakage information exists at the pipe line between the first temperature and pressure detecting device 51 and the battery pack 2 on the first liquid inlet pipe 41 and the first liquid outlet pipe 42.
In some embodiments, the liquid cooling structure comprises a liquid cooling assembly, the liquid cooling assembly comprises a plurality of liquid cooling plates 3, the energy storage battery comprises a battery cluster, the battery cluster comprises a plurality of battery packs 2, and the liquid cooling plates 3 are connected with the battery packs 2; the average flow rate includes a first average flow rate of the liquid cooling plate 3; the temperature difference value of the liquid cooling structure comprises a first temperature difference value of the liquid cooling plate 3, and the state parameters of the energy storage battery comprise the temperature rise rate, the working voltage value and the initial internal resistance value of the battery pack 2;
fig. 6 is a flowchart of monitoring an internal resistance difference value of an energy storage battery according to an embodiment of the present application.
Referring to fig. 6, S600, determining the internal resistance difference of the energy storage battery according to the average flow, the temperature difference value and the state parameter of the energy storage battery includes:
s611, determining the refrigerating capacity of the liquid cooling plate 3 to the battery pack 2 according to the first average flow and the first temperature difference value of the liquid cooling plate 3 and the specific heat capacity of the cooling liquid;
S612, determining the heating value of the battery pack 2 according to the temperature rise rate of the battery pack 2, the mass of the battery pack 2 and the specific heat capacity of the battery pack 2;
s613 determining an average internal resistance value of the battery pack 2 according to the cooling capacity of the battery pack 2, the heating value of the battery pack 2, and the operating voltage value of the battery pack 2;
s614, determining an internal resistance difference value of the battery pack 2 according to the average internal resistance value of the battery pack 2 and the initial internal resistance value of the battery pack 2.
In at least one embodiment, the first temperature difference is a difference between a liquid inlet end temperature and a liquid outlet end temperature of the cooling liquid in the liquid cooling plate 3; the temperature rise rate and the working voltage value of the battery pack 2 can be monitored through the existing second detection component in the liquid cooling energy storage device, such as a battery monitoring module (the battery monitoring module is used for detecting parameters such as working voltage and temperature of the battery pack in the prior art); the initial internal resistance value of the battery pack 2 is already determined at the time of shipment.
In step S611, the cooling capacity Q1 of the liquid cooling plate 3 to the battery pack 2 can be calculated by the following formula:
q1=c1×m1×Δt1 (formula one)
Wherein, the first average flow rate of the liquid cooling plate 3 is denoted by V1, the mass of the cooling liquid flowing through the liquid cooling plate 3 in a unit time is denoted by M1, the density of the cooling liquid is denoted by ρ1, m1=ρ1v1; the first temperature difference of the liquid cooling plate 3 is denoted by Δt1, and the specific heat capacity of the cooling liquid is denoted by c 1.
In step S612, the heating value Q2 of the battery pack 2 may be calculated by the following formula:
q2=c2×m2×Δt2 (formula two)
Wherein the mass of the battery pack 2 can be represented by M2, the temperature rise rate of the battery pack 2 can be represented by DeltaT 2, the unit is per minute, and the specific heat capacity of the battery pack 2 can be represented by c 2.
In step S613, the total heat generation amount of the battery pack 2 is calculated according to the cooling capacity of the battery pack 2 and the heat generation amount of the battery pack 2; then determining the average internal resistance value of the battery pack 2 according to the total heat generation amount of the battery pack 2 and the working voltage value of the battery pack 2;
the total heat production amount Q3 of the battery pack 2 can be calculated by the following formula:
q3=q1+q2 (formula three)
The average internal resistance value R1 of the energy storage battery can be calculated by the following formula:
R1＝Q3/U 2 (equation IV)
Wherein, the average internal resistance value of the battery pack 2 can be represented by R1, and the operating voltage value of the battery pack 2 can be represented by U.
In step S614, the difference between the average internal resistance value of the battery pack 2 and the initial internal resistance value of the battery pack 2 may be determined to determine an internal resistance difference value of the battery pack 2;
the internal resistance difference R3 of the energy storage battery can be calculated by the following formula:
r3=r1-R2 (formula five)
Wherein the initial internal resistance value of the battery pack 2 may be represented by R2.
Fig. 7 is a flowchart of controlling the aging degree of the energy storage battery in the embodiment of the present application.
In some embodiments, referring to fig. 7, S800, determining, according to the average flow and the internal resistance difference, a health monitoring result of the liquid cooling energy storage device further includes:
s831, evaluating the aging degree of the battery pack 2 according to the comparison result of the internal resistance difference of the battery pack 2 and the internal resistance difference of other battery packs 2.
In at least one embodiment, as the liquid-cooled energy storage device is continuously operated, each battery pack 2 of the energy storage battery gradually ages after a period of time, and due to various factors, the aging degree of each battery pack 2 has aging inconsistency; therefore, in step S831, the internal resistance difference of the battery pack 2 and other battery packs 2 may be compared, so that the aging degree of the battery pack 2 with respect to other battery packs 2, in other words, the aging degree of the battery pack 2 is the relative aging degree with respect to other battery packs 2 may be estimated; the aging degree of the battery pack 2 may be represented according to the difference between the internal resistances of the battery pack 2 and the internal resistances of the other battery packs 2, if the difference between the internal resistances of the battery pack 2 is larger than the difference between the internal resistances of the other battery packs 2, the aging degree of the battery pack 2 is larger, and if the difference between the internal resistances of the battery pack 2 and the other battery packs 2 is smaller, the aging degree of the battery pack 2 is smaller.
In some embodiments, the state parameter of the energy storage battery further comprises a temperature difference value of a battery cluster; wherein the temperature difference value of the battery clusters is the difference value of the maximum temperature threshold value and the minimum temperature threshold value of each battery pack 2;
referring to fig. 7, S800, determining, according to the average flow and the internal resistance difference, a health monitoring result of the liquid cooling energy storage device further includes:
s832, judging whether to enter an aging degree control mode of the battery packs 2 according to whether the aging degree of each battery pack 2 is inconsistent or not or according to a comparison result of the temperature difference value of the battery cluster and the temperature preset value of the battery pack 2;
s833, when entering the aging degree control mode of the battery pack 2, adjusting the flow rate of the cooling liquid entering the liquid cooling plate 3 corresponding to the battery pack 2 according to the internal resistance difference value of the battery pack 2.
In at least one embodiment, in step S832, it is determined whether to enter the aging degree control mode of the battery packs 2, and one of the conditions may be selected, for example, when there is an inconsistency in the aging degree of each battery pack 2, in other words, the internal resistance difference values (internal resistance change values) of each battery pack 2 are different; or when the difference between the maximum temperature threshold and the minimum temperature threshold of a certain battery pack 2, that is, the temperature rise rate of the battery pack 2 in unit time is greater than the preset temperature value of the battery pack 2, it can be judged that the aging degree of the battery pack 2 is too high and the service life loss is too fast, and at this time, the aging degree control mode of the battery pack 2 needs to be entered; in contrast, when the degree of aging of each of the battery packs 2 is identical or nearly identical, or when the temperature difference value of the battery cluster is identical or nearly identical to the temperature preset value of the battery pack 2, the degree of aging control mode of the battery pack 2 may not be entered.
In step S833, when the aging degree control mode of the battery pack 2 is entered, it may be determined that the aging inconsistency exists in the battery pack 2 or the temperature rate of a part of the battery pack 2 is too fast, at this time, the opening degree of the electromagnetic valve 6 on the second liquid inlet pipe 43 where the liquid cooling plate 3 corresponding to the battery pack 2 is located may be adjusted accordingly according to the internal resistance difference of the battery pack 2, so as to correspondingly adjust the flow rate of the cooling liquid entering the liquid cooling plate 3 corresponding to the battery pack 2, in other words, the opening degree of the electromagnetic valve 6 may be in positive correlation with the internal resistance difference of the battery pack 2, the opening degree of the electromagnetic valve 6 may be larger, the opening degree of the electromagnetic valve 6 may be smaller, the opening degree of the battery pack 2 may be smaller, and the opening degree of the battery pack 2 may be smaller, so that the flow rate of the cooling liquid flowing through the liquid cooling plate 3 corresponding to the battery pack 2 may be more reasonably and accurately distributed according to the internal resistance difference of each battery pack 2, or the difference of the aging degree of each battery pack 2 may be correspondingly reduced, and the service life of the liquid cooling device may be correspondingly prolonged.
Illustratively, the positive correlation between the internal resistance difference value of the battery pack 2 and the opening degree of the solenoid valve 6 may be represented by constructing a reference table or a corresponding graph; for example, after a period of time of the battery pack 2, the two battery packs are respectively defined as a battery pack 01 and a battery pack 02, if the internal resistance difference of the battery pack 01 is 10 milliohms (or the average internal resistance value of the battery pack is increased by 20% relative to the initial internal resistance value), the internal resistance difference of the battery pack 02 is 5 milliohms (or the average internal resistance value of the battery pack is increased by 10% relative to the initial internal resistance value), the flow rate of the battery pack is 6L/min, and at the moment, the temperature difference value (system temperature difference) of the battery clusters exceeds 5 ℃, an aging control mode is started (or entered) to respectively adjust the opening of the electromagnetic valve corresponding to the battery pack 01, so that the flow rate of the battery pack 01 is 7.8L/min; the opening of the solenoid valve corresponding to the battery pack 02 was adjusted so that the flow rate of the battery pack 02 was 6.9L/min.
In some embodiments, the temperature differential value of the liquid cooling structure further comprises a second temperature differential value of a liquid cooling assembly;
s800, determining a health monitoring result of the liquid cooling energy storage device according to the average flow and the internal resistance difference value further comprises:
s841, constructing a corresponding relation between the internal resistance difference value of the battery pack 2 and the temperature difference of the liquid cooling assembly according to the internal resistance difference value of the battery pack 2 and the second temperature difference value of the liquid cooling assembly.
In at least one embodiment, after determining the internal resistance difference value of the battery pack 2 and the second temperature difference value of the liquid cooling component, where the second temperature difference value of the liquid cooling component is the difference value between the inlet end temperature and the outlet end temperature of the cooling liquid in the liquid cooling component, in step S841, a corresponding relationship between the internal resistance difference value of the battery pack 2 and the temperature difference value of the liquid cooling component may be constructed according to the internal resistance difference value of the battery pack 2 and the second temperature difference value of the liquid cooling component, so as to provide a certain data reference for the design of the later energy storage battery and the liquid cooling structure; for example, the quantized correspondence between the internal resistance difference of the battery pack 2 and the second temperature difference of the liquid cooling component is nonlinear, and if the number of cycles of the liquid cooling energy storage device that has been put into operation reaches 6000, the second temperature difference of the liquid cooling component is 4 degrees, and the internal resistance difference of the battery pack 2 reaches 1 milliohm, the operation of the liquid cooling energy storage device can be considered to satisfy the customer requirements.
One or more embodiments of the present application disclose a controller 7, where the controller 7 includes a processor, a memory, and computer program instructions stored on the memory and executable on the processor, and where the processor executes the computer program instructions for implementing a method for health monitoring of a liquid-cooled energy storage device as described in the above embodiments.
In at least one embodiment, the controller 7 may be a computer, and may also be a control panel; the controller 7 has all technical effects of the health monitoring method of the liquid-cooled energy storage device, and will not be described in detail herein.
Although the present application is disclosed above, the scope of protection of the present application is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the present application, and such changes and modifications would fall within the scope of the present application.

Claims (11)

1. A method for health monitoring of a liquid-cooled energy storage device, comprising:
acquiring operation parameters of the liquid cooling structure and state parameters of the energy storage battery; the operation parameters of the liquid cooling structure comprise a pressure difference value and a temperature difference value of the liquid cooling structure;
determining the average flow rate of the cooling liquid flowing through the liquid cooling structure in unit time according to the differential pressure value;
Determining an internal resistance difference value of the energy storage battery according to the average flow, the temperature difference value and the state parameter of the energy storage battery;
determining a health monitoring result of the liquid cooling energy storage device according to the average flow and the internal resistance difference value; the health monitoring result comprises leakage information of the liquid cooling structure and aging degree of the energy storage battery.
2. The method of claim 1, wherein determining an average flow rate of the cooling fluid through the liquid cooling structure per unit time based on the differential pressure value comprises:
and comparing the pressure difference flow curve of the liquid cooling structure according to the pressure difference value of the liquid cooling structure to determine the average flow of the cooling liquid flowing through the liquid cooling structure in unit time.
3. The method of claim 2, wherein the liquid cooling structure comprises a plurality of liquid cooling plates; the differential pressure value of the liquid cooling structure comprises a first differential pressure value of the liquid cooling plate, and the differential pressure flow curve comprises a first differential pressure flow curve of the liquid cooling plate; the average flow comprises a first average flow of the liquid cooling plate;
according to the average flow and the internal resistance difference value, determining the health monitoring result of the liquid cooling energy storage device comprises the following steps:
Determining a first average flow of the cooling liquid flowing through the liquid cooling plate in unit time according to the first pressure difference value of the liquid cooling plate and a first pressure difference flow curve of the liquid cooling plate;
and determining leakage information of the liquid cooling plate according to a comparison result of the first average flow and the flow preset value of the liquid cooling plate.
4. The method of claim 2, wherein the liquid cooling structure comprises a liquid cooling assembly, wherein the differential pressure value of the liquid cooling structure comprises a second differential pressure value of the liquid cooling assembly, and wherein the differential pressure flow curve comprises a second differential pressure flow curve of the liquid cooling assembly; the average flow rate comprises a first average flow rate of the liquid cooling assembly;
according to the average flow and the internal resistance difference value, determining the health monitoring result of the liquid cooling energy storage device comprises the following steps:
determining a second average flow rate of the cooling liquid flowing through the liquid cooling assembly in unit time according to the second pressure difference value of the liquid cooling assembly and a second pressure difference flow rate curve of the liquid cooling assembly;
and determining leakage information of the liquid cooling assembly according to a comparison result of the second average flow and the flow preset value of the liquid cooling assembly.
5. The method of any one of claims 2 to 4, wherein the liquid cooling structure comprises a liquid cooling assembly comprising a plurality of liquid cooling plates, the energy storage battery comprising a battery cluster comprising a plurality of battery packs, the liquid cooling plates being connected to the battery packs; the average flow rate comprises a first average flow rate of the liquid cooling plate; the temperature difference value of the liquid cooling structure comprises a first temperature difference value of the liquid cooling plate, and the state parameters of the energy storage battery comprise the temperature rise rate, the working voltage value and the initial internal resistance value of the battery pack;
determining the internal resistance difference value of the energy storage battery according to the average flow, the temperature difference value and the state parameter of the energy storage battery comprises:
determining the refrigerating capacity of the liquid cooling plate to the battery pack according to the first average flow and the first temperature difference value of the liquid cooling plate and the specific heat capacity of the cooling liquid;
determining the heating value of the battery pack according to the temperature rise rate of the battery pack, the mass of the battery pack and the specific heat capacity of the battery pack;
determining an average internal resistance value of the battery pack according to the refrigerating capacity of the battery pack, the heating value of the battery pack and the working voltage value of the battery pack;
And determining an internal resistance difference value of the battery pack according to the average internal resistance value of the battery pack and the initial internal resistance value of the battery pack.
6. The method of claim 5, wherein determining a health monitoring result of the liquid-cooled energy storage device based on the average flow and the internal resistance difference further comprises:
and evaluating the aging degree of the battery pack according to the comparison result of the internal resistance difference value of the battery pack and the internal resistance difference values of other battery packs.
7. The method of claim 6, wherein the state parameter of the energy storage battery further comprises a temperature value of a battery cluster; the temperature difference value of the battery cluster is the difference value of the maximum temperature threshold value and the minimum temperature threshold value of each battery pack;
according to the average flow and the internal resistance difference value, determining the health monitoring result of the liquid cooling energy storage device further comprises:
judging whether to enter an aging degree control mode of the battery packs according to whether the aging degree of each battery pack is inconsistent or not or according to a comparison result of the temperature difference value of the battery cluster and the temperature preset value of the battery pack;
When the aging degree control mode of the battery pack is entered, the flow rate of the cooling liquid entering the liquid cooling plate corresponding to the battery pack is adjusted according to the internal resistance difference value of the battery pack.
8. The method of claim 5, wherein the temperature differential value of the liquid cooling structure further comprises a second temperature differential value of a liquid cooling assembly;
according to the average flow and the internal resistance difference value, determining the health monitoring result of the liquid cooling energy storage device further comprises:
and constructing a corresponding relation between the internal resistance difference value of the battery pack and the temperature difference of the liquid cooling assembly according to the internal resistance difference value of the battery pack and the second temperature difference value of the liquid cooling assembly.
9. A controller comprising a processor, a memory, and computer program instructions stored on the memory and executable on the processor, the processor when executing the computer program instructions being configured to implement the method of health monitoring a liquid cooled energy storage device as claimed in any one of claims 1 to 8.
10. The liquid cooling energy storage system is characterized by comprising the controller according to claim 9, and further comprising a liquid cooling unit, a cooling pipeline, a first detection assembly and a liquid cooling energy storage device, wherein the liquid cooling energy storage device comprises an energy storage battery and a liquid cooling structure, the liquid cooling unit is communicated with the liquid cooling structure through the cooling pipeline, and the liquid cooling structure is connected with the energy storage battery; the first detection component is arranged on the cooling pipeline and is used for detecting the pressure difference value and the temperature difference value of the cooling liquid flowing through the liquid cooling structure.
11. The liquid-cooled energy storage system of claim 10, further comprising a solenoid valve, the liquid-cooled structure comprising a liquid-cooled assembly comprising a plurality of liquid-cooled plates, the energy storage battery comprising a battery cluster comprising a plurality of battery packs, the liquid-cooled plates being connected to the battery packs, the first detection assembly comprising a first temperature-pressure detection device and a second temperature-pressure detection device; the liquid cooling plate is provided with a first liquid inlet and a first liquid outlet, and the liquid cooling assembly is provided with a second liquid inlet and a second liquid outlet;
the first temperature and pressure detection device is used for detecting the temperature and pressure value of the first liquid inlet and the temperature and pressure value of the first liquid outlet, the second temperature and pressure detection device is used for detecting the temperature and pressure value of the second liquid inlet and the temperature and pressure value of the second liquid outlet, the electromagnetic valve is arranged on a pipeline between the liquid cooling unit and the first liquid inlet, and the controller is used for controlling the opening degree of the electromagnetic valve according to the detection values of the first temperature and pressure detection device and the second temperature and pressure detection device.
CN202311117964.XA 2023-08-31 2023-08-31 Health monitoring method, controller and system of liquid cooling energy storage device Pending CN117317406A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117811168A (en) * 2024-02-28 2024-04-02 双一力(宁波)电池有限公司 Battery power limiting method, device, management system, device and storage medium

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117811168A (en) * 2024-02-28 2024-04-02 双一力(宁波)电池有限公司 Battery power limiting method, device, management system, device and storage medium
CN117811168B (en) * 2024-02-28 2024-05-17 双一力(宁波)电池有限公司 Battery power limiting method, device, management system, device and storage medium

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