CN110416641B - Battery pack over-temperature protection control method and device, storage medium and controller - Google Patents
Battery pack over-temperature protection control method and device, storage medium and controller Download PDFInfo
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- CN110416641B CN110416641B CN201910652844.7A CN201910652844A CN110416641B CN 110416641 B CN110416641 B CN 110416641B CN 201910652844 A CN201910652844 A CN 201910652844A CN 110416641 B CN110416641 B CN 110416641B
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- battery pack
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- 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]
- G01R31/385—Arrangements for measuring battery or accumulator variables
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- 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
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- 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]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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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
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/486—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring temperature
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
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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
Abstract
The invention provides a battery pack over-temperature protection control method, a battery pack over-temperature protection control device, a storage medium and a controller, wherein the method comprises the following steps: detecting the ambient temperature of the position where the battery pack is located; detecting working parameters of the battery pack in the working state of the battery pack; calculating the internal temperature of the battery pack according to the working parameters of the battery pack; correcting the internal temperature of the battery pack according to the environmental temperature to obtain the actual temperature of the battery pack; and when the actual temperature of the battery pack is higher than or equal to a preset temperature threshold value, performing over-temperature protection operation. The invention can accurately detect the real-time temperature of the battery pack, can provide over-temperature protection in time and prevent the danger of the battery due to overheating.
Description
Technical Field
The invention relates to the technical field of battery protection, in particular to a battery pack over-temperature protection control method, a battery pack over-temperature protection control device, a storage medium and a controller.
Background
It is a common practice of the current battery pack protection to dispose one or more temperature sensors on the surface of the battery pack for sensing the real-time temperature of the battery pack and to cut off the output or input when the real-time temperature is sensed to exceed a set value. However, this method only detects the surface temperature of the battery pack, and there may be a problem that the temperature sensor and the battery pack are not tightly attached or an insulating sheath is present between the temperature sensor and the battery pack, so that there is a large error between the detected surface temperature of the battery pack and the actual surface temperature.
When the battery packs are used more times, the aging degree among the battery packs is inconsistent, so that the internal resistances among the battery packs are different. If the battery packs are used in series, the temperature of each battery pack is higher than that of other battery packs, and if the temperature of the battery pack cannot be accurately detected, the battery pack is possibly overheated and dangerous.
Disclosure of Invention
The embodiment of the invention provides a battery pack over-temperature protection control method, a battery pack over-temperature protection control device, a storage medium and a controller, and aims to solve the problem that in the prior art, the battery pack temperature cannot be accurately detected, and further the battery pack is overheated to cause danger.
The embodiment of the invention provides a battery pack over-temperature protection control method, which comprises the following steps:
detecting the ambient temperature of the position where the battery pack is located;
detecting working parameters of the battery pack in the working state of the battery pack;
calculating the internal temperature of the battery pack according to the working parameters of the battery pack;
correcting the internal temperature of the battery pack according to the environmental temperature to obtain the actual temperature of the battery pack;
and when the actual temperature of the battery pack is higher than or equal to a preset temperature threshold value, performing over-temperature protection operation.
Optionally, the operating parameters include an operating voltage, an operating current, and an accumulated operating time of the battery pack;
the calculating the internal temperature of the battery pack according to the operating parameters of the battery pack comprises:
acquiring the open-circuit voltage of the battery pack, and determining the internal resistance value of the battery pack according to the open-circuit voltage, the working voltage and the working current of the battery pack;
calculating the internal resistance heat productivity of the battery pack according to the internal resistance value, the working current and the accumulated working time of the battery pack;
and calculating the internal temperature of the battery pack according to the internal resistance heating value and the preset thermal resistance value of the battery pack.
Optionally, the method further comprises:
and under the non-working state of the battery pack, detecting the open-circuit voltage of the battery pack in advance and storing the open-circuit voltage.
Optionally, the operating parameters include operating voltage, operating current, and accumulated operating time of each battery cell in the battery pack;
the calculating the internal temperature of the battery pack according to the operating parameters of the battery pack comprises:
acquiring the open-circuit voltage of each battery monomer in the battery pack, and determining the internal resistance value of the corresponding battery monomer according to the open-circuit voltage, the working voltage and the working current of each battery monomer;
calculating the internal resistance heat productivity of the corresponding battery monomer according to the internal resistance value, the working current and the accumulated working time of each battery monomer;
and calculating the internal temperature of each single battery according to the internal resistance heating value of each single battery and the preset thermal resistance value of the corresponding single battery.
Optionally, the method further comprises:
and under the non-working state of the battery pack, detecting and storing the open-circuit voltage of each battery cell of the battery pack in advance.
Optionally, the performing an over-temperature protection operation includes:
starting a battery pack cooling system; and/or
And cutting off the connection of the battery pack and an input power supply or an output load.
Another embodiment of the present invention provides a battery pack over-temperature protection control device, including:
the first detection module is used for detecting the ambient temperature of the position where the battery pack is located;
the second detection module is used for detecting the working parameters of the battery pack in the working state of the battery pack;
the operation module is used for calculating the internal temperature of the battery pack according to the working parameters of the battery pack;
the correction module is used for correcting the internal temperature of the battery pack according to the environmental temperature to obtain the actual temperature of the battery pack;
and the control module is used for executing over-temperature protection operation when the actual temperature of the battery pack is higher than or equal to a preset temperature threshold value.
Optionally, the operating parameters include an operating voltage, an operating current, and an accumulated operating time of the battery pack;
the operation module is specifically used for acquiring the open-circuit voltage of the battery pack and determining the internal resistance value of the battery pack according to the open-circuit voltage, the working voltage and the working current of the battery pack; calculating the internal resistance heat productivity of the battery pack according to the internal resistance value, the working current and the accumulated working time of the battery pack; and calculating the internal temperature of the battery pack according to the internal resistance heating value and the preset thermal resistance value of the battery pack.
Further, the second detection module is further configured to detect and store an open-circuit voltage of the battery pack in advance in a non-operating state of the battery pack.
Optionally, the operating parameters include operating voltage, operating current, and accumulated operating time of each battery cell in the battery pack;
the operation module is specifically used for acquiring the open-circuit voltage of each battery cell in the battery pack, and determining the internal resistance value of the corresponding battery cell according to the open-circuit voltage, the working voltage and the working current of each battery cell; calculating the internal resistance heat productivity of the corresponding battery monomer according to the internal resistance value, the working current and the accumulated working time of each battery monomer; and calculating the internal temperature of each single battery according to the internal resistance heating value of each single battery and the preset thermal resistance value of the corresponding single battery.
Further, the second detection module is further configured to detect and store an open-circuit voltage of each battery cell of the battery pack in advance in a non-operating state of the battery pack.
Optionally, the control module is specifically configured to turn on the battery pack cooling system; and/or disconnecting the battery pack from an input power source or an output load.
Furthermore, the invention also provides a computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method as described above.
The present invention also provides a controller comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor executes the program to implement the steps of the method as described above.
According to the battery pack over-temperature protection control method, device, storage medium and controller provided by the embodiment of the invention, the internal temperature of the battery pack is calculated by detecting the working parameters of the battery pack in the working state, the internal temperature is corrected according to the environmental temperature of the battery pack in the non-working state, the actual temperature inside the battery pack is accurately obtained, the actual temperature is compared with the preset temperature threshold, and when the actual temperature is higher than or equal to the preset temperature threshold, over-temperature protection is timely provided to prevent the battery from being dangerous due to overheating.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a schematic flow chart of a battery pack over-temperature protection control method according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a battery pack over-temperature protection control device according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
Fig. 1 schematically shows a flowchart of a battery pack over-temperature protection control method according to an embodiment of the present invention. Referring to fig. 1, the battery pack over-temperature protection control method provided by the embodiment of the invention specifically includes steps S11 to S15, as follows:
and S11, detecting the ambient temperature of the position where the battery pack is located.
The battery pack described in this embodiment is formed by one or more battery cells, and the battery cell may be a section, a sheet, or a block of battery, or a parallel combination thereof.
Specifically, one or more temperature sensors may be disposed at any position of the battery pack to detect the ambient temperature of the battery pack. In one embodiment, to ensure that the ambient temperature is not affected by the heat generated by the battery pack itself, the ambient temperature may be detected in a non-operating state of the battery pack.
And S12, detecting the working parameters of the battery pack in the working state of the battery pack.
In this embodiment, the working parameters include voltage, current, accumulated working time, and the like.
Specifically, a voltage detection circuit is arranged to detect the voltage or the total voltage of each single cell of the battery pack; the current detection circuit is used for detecting the working current of the battery pack; and recording the accumulated working time of the battery pack by setting a timer.
S13, calculating the internal temperature of the battery pack according to the working parameters of the battery pack;
s14, correcting the internal temperature of the battery pack according to the environment temperature to obtain the actual temperature of the battery pack;
and S15, when the actual temperature of the battery pack is higher than or equal to a preset temperature threshold value, executing an over-temperature protection operation.
In this embodiment, the over-temperature protection operation may include turning on a battery pack cooling system; and/or cutting off the connection between the battery pack and an input power supply or an output load, and the like so as to realize over-temperature protection of the battery.
According to the battery pack over-temperature protection control method provided by the embodiment of the invention, the internal temperature of the battery pack is calculated by detecting the working parameters of the battery pack in the working state, the internal temperature is corrected according to the environment temperature of the battery pack in the non-working state, the actual temperature inside the battery pack is accurately obtained, the actual temperature is compared with the preset temperature threshold, and when the actual temperature is higher than or equal to the preset temperature threshold, over-temperature protection is timely provided to prevent the battery from being dangerous due to overheating.
In a specific embodiment, the operating parameters of the battery pack include the operating voltage, the operating current and the accumulated operating time of each battery cell in the battery pack; further, the detecting an operating parameter of the battery pack includes: and detecting the working voltage and the working current of each battery monomer in the battery pack, and timing the working time.
In this embodiment, calculating the internal temperature of the battery pack according to the operating parameters of the battery pack specifically includes: acquiring the open-circuit voltage of each battery monomer in the battery pack, and determining the internal resistance value of the corresponding battery monomer according to the open-circuit voltage, the working voltage and the working current of each battery monomer; calculating the internal resistance heat productivity of the corresponding battery monomer according to the internal resistance value, the working current and the accumulated working time of each battery monomer; and calculating the internal temperature of each single battery according to the internal resistance heating value of each single battery and the preset thermal resistance value of the corresponding single battery.
The method comprises the following steps of detecting and storing the open-circuit voltage of each single battery of the battery pack in advance when the battery pack is in a non-working state, and calculating the internal resistance value of each single battery of the battery pack in a follow-up mode.
In this embodiment, the internal resistance voltage drop of each cell is calculated according to the open-circuit voltage before each cell starts to operate and the operating voltage when each cell starts to operate, or the internal resistance voltage drop of each cell is calculated according to the operating voltage before each cell finishes operating and the open-circuit voltage after each cell finishes operating, and the calculation model is as follows:
the internal resistance voltage drop is the open circuit voltage of the monomer-the working voltage of the monomer;
then, calculating the internal resistance value of each single body according to the relation between the internal resistance voltage drop and the working current of the battery pack, wherein the calculation model is as follows:
the internal resistance value is the internal resistance voltage drop/working current of the battery pack;
the heat productivity of each monomer can be calculated by utilizing the relation between the internal resistance value of each monomer and the real-time working current and time of the battery pack, and the calculation model is as follows:
W＝I^2*R*t；
wherein: w is the calorific value; i is working current; r is the internal resistance of a single battery; t is the working time of the battery;
specifically, the internal temperature W × J of each single battery is calculated according to the internal resistance heating value of the single battery and the preset thermal resistance value of the corresponding single battery, and then the internal temperature of the battery pack is corrected according to the environmental temperature to obtain the actual temperature of the battery pack, wherein the calculation model is as follows:
Tc＝T0+W*J
wherein Tc is the internal temperature of the battery; t0 is ambient temperature; w is the internal resistance heating value of the single battery; j is the thermal resistance of the battery;
thermal resistance, also known as thermal resistivity, is the resistance of a thermally conductive material to heat conduction, and the greater the thermal resistivity of a thermally conductive material, the greater its resistance to heat conduction.
The internal temperature of each battery monomer of the battery pack is compared with a set temperature threshold value, and when the internal temperature of a certain battery monomer is higher than or equal to the preset temperature threshold value, the over-temperature protection operation is executed, so that the over-temperature protection of the battery pack is timely and accurately realized.
In another specific embodiment, the operating parameters of the battery pack include an operating voltage, an operating current, and an accumulated operating time of the battery pack; further, the detecting an operating parameter of the battery pack includes: and detecting the working voltage and the working current of the battery pack, and timing the working time.
In this embodiment, calculating the internal temperature of the battery pack according to the operating parameters of the battery pack specifically includes: acquiring the open-circuit voltage of the battery pack, and determining the internal resistance value of the battery pack according to the open-circuit voltage, the working voltage and the working current of the battery pack; calculating the internal resistance heat productivity of the battery pack according to the internal resistance value, the working current and the accumulated working time of the battery pack; and calculating the internal temperature of the battery pack according to the internal resistance heating value and the preset thermal resistance value of the battery pack.
The method comprises the following steps of detecting the open-circuit voltage of the battery pack in advance and storing the open-circuit voltage in the non-working state of the battery pack so as to be used for calculating the internal resistance value of the subsequent battery pack.
In the embodiment, the voltage of each single cell is detected instead of the total voltage of the battery pack, and other detection modes are kept consistent. And calculating the total internal resistance of the battery pack by using the differential pressure of the total internal resistance of the battery pack and the working current, and calculating the internal temperature of the battery pack according to the calculation method of the optimal embodiment.
According to the embodiment of the invention, the ambient temperature of the battery pack is detected through the temperature sensor, the internal resistance and the real-time current of each battery are detected through the detection circuit, the self heating value of each battery is calculated according to the relation between the internal resistance and the real-time current of each battery and time, the actual temperature inside each battery can be calculated according to the ambient temperature of the battery, and the temperature value is compared with the preset temperature protection value, so that the battery is timely and accurately protected from over-temperature.
For simplicity of explanation, the method embodiments are described as a series of acts or combinations, but those skilled in the art will appreciate that the embodiments are not limited by the order of acts described, as some steps may occur in other orders or concurrently with other steps in accordance with the embodiments of the invention. Further, those skilled in the art will appreciate that the embodiments described in the specification are presently preferred and that no particular act is required to implement the invention.
Fig. 2 schematically shows a structural view of a battery pack over-temperature protection control device according to an embodiment of the present invention. Referring to fig. 2, the battery pack over-temperature protection control device according to the embodiment of the present invention specifically includes a first detection module 201, a second detection module 202, an operation module 203, a correction module 204, and a control module 205, where:
a first detection module 201, configured to detect an ambient temperature at a location where the battery pack is located;
the second detection module 202 is configured to detect an operating parameter of the battery pack in an operating state of the battery pack;
the operation module 203 is used for calculating the internal temperature of the battery pack according to the working parameters of the battery pack;
a correction module 204, configured to correct the internal temperature of the battery pack according to the ambient temperature to obtain an actual temperature of the battery pack;
the control module 205 is configured to perform an over-temperature protection operation when the actual temperature of the battery pack is greater than or equal to a preset temperature threshold.
In this embodiment, the control module 205 is specifically configured to turn on the battery pack cooling system; and/or disconnecting the battery pack from an input power source or an output load.
In an embodiment of the present invention, the operating parameters include an operating voltage, an operating current, and an accumulated operating time of the battery pack.
The operation module 203 is specifically configured to obtain an open-circuit voltage of the battery pack, and determine an internal resistance value of the battery pack according to the open-circuit voltage, the working voltage, and the working current of the battery pack; calculating the internal resistance heat productivity of the battery pack according to the internal resistance value, the working current and the accumulated working time of the battery pack; and calculating the internal temperature of the battery pack according to the internal resistance heating value and the preset thermal resistance value of the battery pack.
Further, the second detecting module 202 is further configured to detect and store an open-circuit voltage of the battery pack in advance when the battery pack is not in an operating state.
In another embodiment of the present invention, the operating parameters include an operating voltage, an operating current and an accumulated operating time of each battery cell in the battery pack.
The operation module 203 is specifically configured to obtain an open-circuit voltage of each battery cell in the battery pack, and determine an internal resistance value of the corresponding battery cell according to the open-circuit voltage, the working voltage, and the working current of each battery cell; calculating the internal resistance heat productivity of the corresponding battery monomer according to the internal resistance value, the working current and the accumulated working time of each battery monomer; calculating the internal temperature of each single battery according to the internal resistance heating value of each single battery and the preset thermal resistance value of the corresponding single battery; and calculating the average temperature of the internal temperature of each battery cell, and taking the average temperature as the internal temperature of the battery pack.
Further, the second detecting module 202 is further configured to detect and store an open-circuit voltage of each battery cell of the battery pack in advance when the battery pack is not in an operating state.
For the device embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, refer to the partial description of the method embodiment.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
According to the battery pack over-temperature protection control method and device provided by the embodiment of the invention, the internal temperature of the battery pack is calculated by detecting the working parameters of the battery pack in the working state, the internal temperature is corrected according to the environment temperature of the battery pack in the non-working state, the actual temperature inside the battery pack is accurately obtained, the actual temperature is compared with the preset temperature threshold, and when the actual temperature is higher than or equal to the preset temperature threshold, over-temperature protection is timely provided to prevent the battery from being dangerous due to overheating.
Furthermore, an embodiment of the present invention also provides a computer-readable storage medium, on which a computer program is stored, which when executed by a processor implements the steps of the method as described above.
In this embodiment, if the module/unit integrated with the battery pack over-temperature protection control device is implemented in the form of a software functional unit and sold or used as an independent product, the module/unit may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow of the method according to the embodiments of the present invention may also be implemented by a computer program, which may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method embodiments may be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer readable medium may contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals as is required by legislation and patent practice.
The controller provided by the embodiment of the invention comprises a memory, a processor and a computer program which is stored on the memory and can run on the processor, wherein the processor executes the computer program to realize the steps in the above embodiments of the battery pack over-temperature protection control method, such as S11-S15 shown in fig. 1. Alternatively, the processor implements the functions of the modules/units in the above embodiments of the over-temperature protection control device for battery packs when executing the computer program, such as the first detecting module 201, the second detecting module 202, the computing module 203, the correcting module 204, and the control module 205 shown in fig. 2.
Illustratively, the computer program may be partitioned into one or more modules/units that are stored in the memory and executed by the processor to implement the invention. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution process of the computer program in the battery pack over-temperature protection control device. For example, the computer program may be divided into a first detection module 201, a second detection module 202, an operation module 203, a correction module 204, and a control module 205.
The controller may include, but is not limited to, a processor, a memory. Those skilled in the art will appreciate that the controller in this embodiment may include more or fewer components, or combine certain components, or different components, for example, the controller may also include input output devices, network access devices, buses, etc.
The Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, discrete hardware component, etc. The general purpose processor may be a microprocessor or the processor may be any conventional processor or the like that is the control center for the controller and that connects the various parts of the overall controller using various interfaces and lines.
The memory may be used to store the computer programs and/or modules, and the processor may implement the various functions of the controller by running or executing the computer programs and/or modules stored in the memory, as well as by invoking data stored in the memory. The memory may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the cellular phone, and the like. In addition, the memory may include high speed random access memory, and may also include non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), at least one magnetic disk storage device, a Flash memory device, or other volatile solid state storage device.
Those skilled in the art will appreciate that while some embodiments herein include some features included in other embodiments, rather than others, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the following claims, any of the claimed embodiments may be used in any combination.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. An over-temperature protection control method for a battery pack, the method comprising:
detecting the ambient temperature of the position where the battery pack is located;
detecting working parameters of the battery pack in the working state of the battery pack;
calculating the internal temperature of the battery pack according to the working parameters of the battery pack;
correcting the internal temperature of the battery pack according to the environmental temperature to obtain the actual temperature of the battery pack;
performing an over-temperature protection operation when the actual temperature of the battery pack is higher than or equal to a preset temperature threshold;
the working parameters comprise working voltage, working current and accumulated working time of the battery pack; the calculating the internal temperature of the battery pack according to the operating parameters of the battery pack comprises:
acquiring the open-circuit voltage of the battery pack, and determining the internal resistance value of the battery pack according to the open-circuit voltage, the working voltage and the working current of the battery pack;
calculating the internal resistance heat productivity of the battery pack according to the internal resistance value, the working current and the accumulated working time of the battery pack;
and calculating the internal temperature of the battery pack according to the internal resistance heating value and the preset thermal resistance value of the battery pack.
2. The battery pack over-temperature protection control method according to claim 1, further comprising:
and under the non-working state of the battery pack, detecting the open-circuit voltage of the battery pack in advance and storing the open-circuit voltage.
3. The battery pack over-temperature protection control method according to claim 1, wherein the operating parameters include operating voltage, operating current, and accumulated operating time of each battery cell in the battery pack;
the calculating the internal temperature of the battery pack according to the operating parameters of the battery pack comprises:
acquiring the open-circuit voltage of each battery monomer in the battery pack, and determining the internal resistance value of the corresponding battery monomer according to the open-circuit voltage, the working voltage and the working current of each battery monomer;
calculating the internal resistance heat productivity of the corresponding battery monomer according to the internal resistance value, the working current and the accumulated working time of each battery monomer;
and calculating the internal temperature of each single battery according to the internal resistance heating value of each single battery and the preset thermal resistance value of the corresponding single battery.
4. The battery pack over-temperature protection control method according to any one of claims 1 to 3, wherein the performing of the over-temperature protection operation includes:
starting a battery pack cooling system; and/or
And cutting off the connection of the battery pack and an input power supply or an output load.
5. A battery pack over-temperature protection control device, the device comprising:
the first detection module is used for detecting the ambient temperature of the position where the battery pack is located;
the second detection module is used for detecting the working parameters of the battery pack in the working state of the battery pack;
the operation module is used for calculating the internal temperature of the battery pack according to the working parameters of the battery pack;
the correction module is used for correcting the internal temperature of the battery pack according to the environmental temperature to obtain the actual temperature of the battery pack;
the control module is used for executing over-temperature protection operation when the actual temperature of the battery pack is higher than or equal to a preset temperature threshold value;
the working parameters comprise working voltage, working current and accumulated working time of the battery pack; the operation module is specifically used for acquiring the open-circuit voltage of the battery pack and determining the internal resistance value of the battery pack according to the open-circuit voltage, the working voltage and the working current of the battery pack; calculating the internal resistance heat productivity of the battery pack according to the internal resistance value, the working current and the accumulated working time of the battery pack; and calculating the internal temperature of the battery pack according to the internal resistance heating value and the preset thermal resistance value of the battery pack.
6. The battery pack over-temperature protection control device according to claim 5, wherein the operating parameters include an operating voltage, an operating current, and an accumulated operating time of each battery cell in the battery pack;
the operation module is specifically used for acquiring the open-circuit voltage of each battery cell in the battery pack, and determining the internal resistance value of the corresponding battery cell according to the open-circuit voltage, the working voltage and the working current of each battery cell; calculating the internal resistance heat productivity of the corresponding battery monomer according to the internal resistance value, the working current and the accumulated working time of each battery monomer; and calculating the internal temperature of each single battery according to the internal resistance heating value of each single battery and the preset thermal resistance value of the corresponding single battery.
7. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 4.
8. A controller, characterized by a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor, when executing the program, carries out the steps of the method according to any of claims 1-4.
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