CN111430825B - Internal short circuit processing method and device for lithium battery - Google Patents
Internal short circuit processing method and device for lithium battery Download PDFInfo
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- CN111430825B CN111430825B CN202010247651.6A CN202010247651A CN111430825B CN 111430825 B CN111430825 B CN 111430825B CN 202010247651 A CN202010247651 A CN 202010247651A CN 111430825 B CN111430825 B CN 111430825B
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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
- H01M10/44—Methods for charging or discharging
- H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
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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
- H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
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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
- H01M2200/00—Safety devices for primary or secondary batteries
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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
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
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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 embodiment of the invention provides a method and a device for processing an internal short circuit of a lithium battery, wherein the method comprises the following steps: determining a maximum voltage drop value in an effective charging process of a lithium battery system, wherein the maximum voltage drop value is the maximum value of a voltage difference value of a single battery in the lithium battery system between a first moment and a second moment, and the first moment is before the second moment; if the maximum voltage drop value is larger than 0, judging whether the maximum voltage drop value is larger than a preset threshold value, and if so, determining short circuit in the lithium battery and generating alarm information of different levels; and determining corresponding control measures according to the grade of the alarm information. According to the embodiment of the invention, the occurrence of the internal short circuit fault and the corresponding level of the battery can be quickly judged according to the voltage drop condition of the single battery in the charging process, and corresponding measures are taken in time, so that the accident rate caused by the short circuit of the battery is greatly reduced.
Description
Technical Field
The embodiment of the invention relates to the technical field of power batteries, in particular to a method and a device for processing internal short circuit of a lithium battery.
Background
With the development of pure electric vehicles, the safety problem of the power battery is increasingly prominent. Short circuits in the battery often cause capacity fading, local thermal runaway and even safety accidents of the lithium battery system. The main reason for short circuit in the battery is that after the lithium battery system is used for a long time or is charged excessively under the conditions of high current and low temperature, metal lithium is separated out from the surface of the negative pole piece, and dendritic crystals are formed by deposition of the lithium to pierce a diaphragm, so that the safety problem is caused, and safety accidents are caused.
At present, a Battery Management System (BMS) collects and monitors the voltage of each Battery in a Battery System and the temperature of a lithium Battery System in real time, and when an internal short circuit or thermal runaway occurs in a Battery, abnormal alarm information such as too low voltage of a single Battery, too large differential pressure of the single Battery, too high temperature of the Battery and the like can be reported and controlled.
However, there is no good management for the internal short circuit in the existing BMS, and after the internal short circuit occurs, the internal short circuit cannot be quickly identified and processed at the first time through methods such as temperature detection, and thus a subsequent serious accident may be caused.
Disclosure of Invention
The embodiment of the invention provides a method and a device for processing an internal short circuit of a lithium battery, which are used for solving the problems that in the prior art, the internal short circuit is not well managed, and after the internal short circuit occurs, the internal short circuit cannot be rapidly identified and processed at the first time through methods such as temperature detection and the like, so that subsequent serious accidents can be caused.
A first aspect of an embodiment of the present invention provides a method for processing an internal short circuit of a lithium battery, including:
determining a maximum voltage drop value in an effective charging process of a lithium battery system, wherein the maximum voltage drop value is the maximum value of a voltage difference value of a single battery in the lithium battery system between a first moment and a second moment, and the first moment is before the second moment;
if the maximum voltage drop value is larger than 0, judging whether the maximum voltage drop value is larger than a preset threshold value, and if so, determining short circuit in the lithium battery and generating alarm information of different levels;
and determining corresponding control measures according to the grade of the alarm information.
Optionally, the determining whether the maximum voltage drop value is greater than a preset threshold, and generating alarm information of different levels if the determination result is yes, includes:
and judging whether the maximum voltage drop value is greater than a first preset threshold value or not, and generating primary alarm information if the judgment result is yes.
Optionally, the determining whether the maximum voltage drop value is greater than a preset threshold, and generating alarm information of different levels if the determination result is yes, includes:
if the maximum voltage drop value is larger than a first preset threshold value, judging whether the maximum voltage drop value is larger than a second preset threshold value, and generating secondary alarm information if the judgment result is yes;
wherein the first preset threshold is smaller than the second preset threshold.
Optionally, the determining whether the maximum voltage drop value is greater than a preset threshold, and generating alarm information of different levels if the determination result is yes, includes:
if the maximum voltage drop value is larger than a second preset threshold, judging whether the maximum voltage drop value is larger than a third preset threshold, and generating three-level alarm information if the judgment result is yes;
wherein the second preset threshold is smaller than the third preset threshold.
Optionally, the determining a corresponding control measure according to the level of the alarm information includes:
if the alarm information is primary alarm information or secondary alarm information, the primary alarm information or the secondary alarm information is sent to a terminal to indicate target personnel to take corresponding measures;
and if the alarm information is the third-level alarm information, the main contactor of the battery management system BMS is controlled to be disconnected so as to control the BMS to stop charging the lithium battery system.
Optionally, the determining the maximum voltage drop value includes:
collecting the voltage value of each battery monomer in the lithium battery system at each set moment;
respectively calculating the difference value between the voltage value of each battery cell at a first moment and a second moment, wherein the first moment and the second moment are two adjacent set moments and the first moment is before the second moment;
determining the maximum difference value of all the battery cells as the maximum voltage drop value;
wherein the time interval between every two adjacent set moments is 1 second.
Optionally, the method further comprises: judging whether the lithium battery system is in the effective charging process:
collecting a current value in the charging process of the lithium battery system in real time;
and if the current value is larger than a preset current threshold value, judging that the lithium battery system is in the effective charging process.
A second aspect of an embodiment of the present invention provides an internal short circuit processing apparatus for a lithium battery, including:
the determining module is used for determining a maximum voltage drop value in the effective charging process of the lithium battery system, wherein the maximum voltage drop value is the maximum value of a voltage difference value of a single battery in the lithium battery system between a first moment and a second moment, and the first moment is before the second moment;
the processing module is used for judging whether the maximum voltage drop value is greater than a preset threshold value or not if the maximum voltage drop value is greater than 0, and determining short circuit in the lithium battery and generating alarm information of different levels if the judgment result is yes;
and the processing module is also used for determining corresponding control measures according to the grade of the alarm information.
A third aspect of an embodiment of the present invention provides an electronic device, including: at least one processor and memory;
the memory stores computer-executable instructions;
the at least one processor executes the computer-executable instructions stored in the memory, so that the at least one processor executes the method for processing the internal short circuit of the lithium battery according to the first aspect of the embodiment of the present invention.
A fourth aspect of the present invention provides a computer-readable storage medium, where a computer executing instruction is stored in the computer-readable storage medium, and when a processor executes the computer executing instruction, the method for processing an internal short circuit of a lithium battery according to the first aspect of the present invention is implemented.
The embodiment of the invention provides a method and a device for processing an internal short circuit of a lithium battery, wherein a maximum voltage drop value is determined in the effective charging process of a lithium battery system, and the maximum voltage drop value is the maximum value of the voltage difference value of a single battery in the lithium battery system between a first moment and a second moment, wherein the first moment is before the second moment; therefore, if the maximum voltage drop value is greater than 0, the voltage drop of the lithium battery in the charging process can be judged, then whether the maximum voltage drop value is greater than a preset threshold value or not is judged, and when the judgment result is yes, the process realizes that the internal short circuit fault of the lithium battery is quickly judged to be generated by utilizing the voltage drop condition of the single battery in the charging process so as to determine that the internal short circuit occurs in the lithium battery; simultaneously generating alarm information of different levels; and determining corresponding control measures according to the level of the alarm information, and taking the control measures in time greatly reduces the accident rate caused by the short circuit of the battery.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is an application scenario diagram illustrating a method for processing an internal short circuit of a lithium battery according to an exemplary embodiment of the present invention;
fig. 2 is a schematic flow chart illustrating a method for treating an internal short circuit of a lithium battery according to an exemplary embodiment of the present invention;
fig. 3 is a schematic flowchart illustrating a method of treating an internal short circuit of a lithium battery according to another exemplary embodiment of the present invention;
fig. 4 is a schematic structural diagram illustrating an internal short-circuit processing device of a lithium battery according to an exemplary embodiment of the present invention;
fig. 5 is a schematic structural diagram of an electronic device according to an exemplary embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
With the development of pure electric vehicles, the safety problem of the power battery is increasingly prominent. Short circuits in the battery often cause capacity fading, local thermal runaway and even safety accidents of the lithium battery system. The main reason for short circuit in the battery is that after the lithium battery system is used for a long time or is charged excessively under the conditions of high current and low temperature, metal lithium is separated out from the surface of the negative pole piece, and dendritic crystals are formed by deposition of the lithium to pierce a diaphragm, so that the safety problem is caused, and safety accidents are caused.
At present, a Battery Management System (BMS) collects and monitors the voltage of each Battery in a Battery System and the temperature of a lithium Battery System in real time, and when an internal short circuit or thermal runaway occurs in a Battery, abnormal alarm information such as too low voltage of a single Battery, too large differential pressure of the single Battery, too high temperature of the Battery and the like can be reported and controlled. For example, when the battery management system BMS acquires that the cell voltage in the lithium battery system is lower than a certain set threshold, the BMS outputs alarm information that the cell voltage is abnormally low; when the BMS acquires that the voltage difference of the single batteries in the lithium battery system exceeds a certain set threshold value, the BMS outputs alarm information of the abnormal condition of the overlarge voltage difference of the single batteries; when the BMS collects that the temperature in the lithium battery system is higher than a certain set threshold value, the BMS outputs alarm information about overhigh temperature and abnormity.
However, there is no good management for the internal short circuit in the conventional BMS, and after the internal short circuit occurs, the internal short circuit cannot be quickly identified and processed at the first time by a method such as temperature detection. For example, the cell voltage may be too low due to self-discharge of the battery, low capacity of the battery itself, and other reasons; too large a cell pressure difference may also be caused by inconsistent initial state of charge of the battery, low capacity of the battery itself, and the like. Therefore, whether the cell is internally short-circuited or not can not be well identified through two indexes of too low cell voltage and too high cell voltage difference; in addition, the over-high battery temperature may be caused by a high usage environment temperature or a large battery charge-discharge power; and after the internal short circuit fault of the battery occurs, the heat and the temperature are transmitted to the temperature sampling probe for a certain time, when the temperature is too high for alarming, the temperature of the battery is possibly far higher than the acquired temperature, and the internal short circuit cannot be rapidly identified and responded only through temperature detection. Therefore, the above three determination methods cannot quickly and accurately determine whether the battery has an internal short circuit, so that the optimal processing time of the battery accident is easily missed, and the occurrence of subsequent serious accidents may be caused.
Aiming at the defect, the technical scheme of the invention mainly comprises the following steps: determining a maximum voltage drop value in an effective charging process of a lithium battery system, wherein the maximum voltage drop value is the maximum value of a voltage difference value of a single battery in the lithium battery system between a first time and a second time, and the first time is before the second time; therefore, if the maximum voltage drop value is greater than 0, the situation that the voltage of the single battery is reduced in the charging process of the lithium battery can be judged, then whether the maximum voltage drop value is greater than a preset threshold value or not is judged, and when the judgment result is yes, the process realizes that the internal short circuit fault of the battery is quickly judged to determine that the internal short circuit of the lithium battery occurs by utilizing the voltage drop situation of the single battery in the charging process; normally, as the charging process, the voltage of the single battery is gradually increased, and the short circuit in the battery can cause the voltage of the battery to be reduced. Therefore, if the voltage of the single battery does not rise and fall back during the charging process, the internal short circuit of the battery is indicated. Therefore, the internal short circuit of the battery can be judged quickly and accurately by utilizing the fact that the voltage of the single battery does not rise or fall reversely in the charging process. Meanwhile, alarm information of different levels is generated, corresponding control measures are determined according to the levels of the alarm information, and the accident rate caused by battery short circuit is greatly reduced by taking the control measures in time.
Fig. 1 is an application scenario diagram of a method for processing an internal short circuit of a lithium battery according to an exemplary embodiment of the present invention.
As shown in fig. 1, the basic architecture of the application scenario provided by this embodiment mainly includes: a lithium battery system 101, a battery management system BMS 102 and a vehicle control unit VCU 103; the battery management system BMS is used for collecting and calculating the parameters of voltage, current and temperature of the lithium battery system, further controlling the charging and discharging process of the battery, and sending abnormal information appearing in the charging and discharging process to the VCU of the vehicle control unit so as to enable the VCU to control and carry out follow-up operation.
Fig. 2 is a schematic flow chart illustrating a method for processing an internal short circuit of a lithium battery according to an exemplary embodiment of the present invention, and an execution subject of the method provided in this embodiment may be a battery management system BMS in the embodiment illustrated in fig. 1.
As shown in fig. 2, the method provided by the present embodiment may include the following steps.
S201, in the effective charging process of the lithium battery system, determining a maximum voltage drop value, wherein the maximum voltage drop value is the maximum value of a voltage difference value of a single battery in the lithium battery system between a first moment and a second moment, and the first moment is before the second moment.
Specifically, the BMS collects the voltage values of the single batteries at a first moment and a second moment in real time in the effective charging process of the lithium battery system, the first moment is before the second moment, and then the difference value between the voltage values at the two moments is calculated. That is, the voltage value acquired at the previous moment is subtracted from the voltage value acquired at the next moment by the same single battery to obtain a voltage drop value corresponding to the single battery. The voltage drop value of the single battery between adjacent moments is collected and calculated in real time in the effective charging process of the lithium battery system, so that the voltage drop value of the single battery corresponding to each moment and compared with the voltage drop value at the last adjacent moment can be obtained. Similarly, each single battery in the lithium battery system can calculate to obtain voltage drop values corresponding to different moments, and the largest voltage drop value of all the single batteries at the same moment is determined as the maximum voltage drop value of the lithium battery system at the moment, so that the maximum voltage drop value of the lithium battery system at each moment is obtained.
S202, if the maximum voltage drop value is larger than 0, judging whether the maximum voltage drop value is larger than a preset threshold value, and if so, determining that the lithium battery is short-circuited and generating alarm information of different levels.
Specifically, normally, as the voltage of the single battery gradually increases along with the charging, the voltage value at the first time should be smaller than the voltage value at the second time, and therefore, the calculated maximum voltage drop value should be smaller than 0; and the voltage of the battery is reduced due to the internal short circuit of the battery, so that if the voltage of the single battery does not rise and fall (namely the calculated maximum voltage drop value is greater than 0) and the voltage drop exceeds a set threshold value in the charging process, the internal short circuit of the battery is indicated, and meanwhile, alarm information of different levels is generated.
S203, determining corresponding control measures according to the grade of the alarm information.
Specifically, alarm information of different levels is generated according to the voltage drop condition, the severity of the voltage drop can be determined according to the level of the alarm information, the more severe the voltage drop is, the higher the alarm level is, and different control measures are determined according to the alarm information of different levels.
Illustratively, for the alarm information of a light level, the alarm information is only required to be sent to a terminal to remind an operator, and the operator determines the next control measure; to the alarm information of serious level, can directly stop to charge for lithium battery system according to this alarm information automatic control BMS.
In this embodiment, a maximum voltage drop value is determined in an effective charging process of a lithium battery system, and the maximum voltage drop value is a maximum value of a voltage difference value between a first time and a second time of a single battery in the lithium battery system, where the first time is before the second time; therefore, if the maximum voltage drop value is greater than 0, the voltage drop of the lithium battery in the charging process can be judged, then whether the maximum voltage drop value is greater than a preset threshold value or not is judged, and when the judgment result is yes, the process realizes that the internal short circuit fault of the lithium battery is quickly judged to be generated by utilizing the voltage drop condition of the single battery in the charging process so as to determine that the internal short circuit occurs in the lithium battery; simultaneously generating alarm information of different levels; and determining corresponding control measures according to the level of the alarm information, and taking the control measures in time greatly reduces the accident rate caused by the short circuit of the battery.
Fig. 3 is a schematic flow chart of a method for processing an internal short circuit of a lithium battery according to another exemplary embodiment of the present invention, and the method provided in this embodiment is further described in detail on the basis of the embodiment shown in fig. 2.
As shown in fig. 3, the method provided by the present embodiment may include the following steps.
And S301, judging whether the lithium battery system is effectively charged.
Specifically, the current value in the charging process of the lithium battery system is collected in real time; and if the current value is larger than a preset current threshold value, judging that the lithium battery system is in the effective charging process.
The preset current threshold value can be determined according to actual requirements.
For example, the preset current threshold may be set to 1 ampere (a), and when the collected current value is greater than 1A, it may be determined that the lithium battery system is being effectively charged at that time; if the current value of the lithium battery system is always larger than 1A in a period of time, the lithium battery system is in an effective charging state in the period of time.
And S302, if the judgment result is yes, acquiring the voltage value of each battery monomer in the lithium battery system at each set moment in the charging process of the lithium battery system.
Wherein the time interval between every two adjacent set moments is 1 second.
Specifically, in the charging process of the lithium battery system, the voltage values of all the single batteries are collected once every second.
And S303, respectively calculating the difference value between the voltage values of each battery cell at a first moment and a second moment, wherein the first moment and the second moment are two adjacent set moments, and the first moment is before the second moment.
And S304, determining the maximum difference value of all the battery cells as the maximum voltage drop value.
Specifically, the BMS collects the voltage values of the single batteries at the first moment and the second moment in real time in the effective charging process of the lithium battery system, and the first moment is before the second moment. That is, the voltage value acquired at the previous moment is subtracted from the voltage value acquired at the next moment by the same single battery to obtain a voltage drop value corresponding to the single battery. The voltage drop value of the single battery between adjacent moments is collected and calculated in real time in the effective charging process of the lithium battery system, so that the voltage drop value of the single battery at each moment corresponding to the previous adjacent moment can be obtained. Similarly, each single battery in the lithium battery system can calculate to obtain voltage drop values corresponding to different moments, and the largest voltage drop value of all the single batteries at the same moment is determined as the maximum voltage drop value of the lithium battery system at the moment, so that the maximum voltage drop value of the lithium battery system at each moment is obtained.
For example, the difference between the voltage value of a certain single battery 1s before and the current voltage value of the single battery is calculated and obtained to serve as the voltage drop value of the single battery at the current moment, the voltage drop value corresponding to the current moment can be obtained for each single battery in the lithium battery system, the maximum voltage drop value corresponding to all the single batteries at the current moment is screened and determined to be the maximum voltage drop value of the lithium battery system at the current moment, and so on, the lithium battery system can obtain each corresponding maximum voltage drop value in real time.
S305, judging whether the maximum voltage drop value is larger than a first preset threshold value or not, and generating primary alarm information if the judgment result is yes.
Specifically, normally, as the charging progresses, the voltage of the single battery gradually rises, and the voltage value at the first time should be smaller than the voltage value at the second time. For example, the voltage value of the first 1s of the same single battery should be smaller than the voltage value at the current moment. Therefore, the calculated maximum voltage drop value should be less than 0. However, the internal short circuit of the battery can cause the voltage of the battery to drop, so if the voltage of the single battery does not rise and drop back during the charging process (namely, the calculated maximum voltage drop value is greater than 0), and the voltage drop exceeds the set threshold value, the internal short circuit of the battery is indicated.
S306, if the maximum voltage drop value is larger than a first preset threshold value, judging whether the maximum voltage drop value is larger than a second preset threshold value, and generating secondary alarm information if the judgment result is yes; wherein the first preset threshold is smaller than the second preset threshold.
S307, if the maximum voltage drop value is larger than a second preset threshold, judging whether the maximum voltage drop value is larger than a third preset threshold, and generating three-level alarm information if the judgment result is yes; wherein the second preset threshold is smaller than the third preset threshold.
Specifically, in steps S305 to S307, while the short circuit in the battery is determined, the fault level of the battery is determined in a grading manner, and the alarm information of the corresponding level is generated, wherein the first preset threshold, the second preset threshold, and the third preset threshold may be set according to the actual requirement, and the larger the maximum voltage drop value is, the more serious the short circuit fault in the battery is.
Illustratively, the first preset threshold may be set to 50 millivolts (mV), the second preset threshold may be set to 100mV, and the third preset threshold may be set to 200mV, when the maximum voltage drop value is greater than 50mV but less than 100mV, it may be considered that the short circuit fault in the battery is light, and a first-level alarm message is generated correspondingly; when the maximum voltage drop value is larger than 100mV but smaller than 200mV, indicating the medium level of short circuit fault in the battery, and correspondingly generating secondary alarm information; and when the maximum voltage drop value is greater than 200mV, the short circuit fault in the battery is serious, and if no immediate measures are taken, serious battery safety accidents are likely to happen, and at the moment, three-level alarm information is correspondingly generated.
It can be understood that the generated first-level alarm information, second-level alarm information and third-level alarm information are stored in a memory correspondingly, so that relevant technicians can conveniently call and check the information.
S308, determining corresponding control measures according to the grade of the alarm information.
Specifically, the BMS may select a preset control measure corresponding to the alarm information of different levels.
In one embodiment, if the alarm information is primary alarm information or secondary alarm information, the primary alarm information or the secondary alarm information is sent to a terminal to indicate target personnel to take corresponding measures; and if the alarm information is the third-level alarm information, the main contactor of the battery management system BMS is controlled to be disconnected so as to control the BMS to stop charging the lithium battery system.
Specifically, after the alarm information is generated, if only the primary alarm information or the secondary alarm information is generated, the BMS sends the primary alarm information or the secondary alarm information to the display terminal to remind relevant technicians of observing the charging state in real time; if tertiary alarm information has been generated, BMS then can the disconnection of automatic control main contactor, stops lithium battery system to charge to send tertiary alarm information to VCU.
In the embodiment, whether the lithium battery has internal short circuit or not can be judged quickly and accurately, further, grading early warning can be realized after the internal short circuit occurs in the lithium battery, corresponding control measures are provided for early warning of each grade, the charging process is automatically controlled to be cut off when the internal short circuit fault is serious, and the occurrence rate of safety accidents of the electric automobile battery can be greatly reduced.
Fig. 4 is a schematic structural diagram of an internal short-circuit processing apparatus for a lithium battery according to an exemplary embodiment of the present invention.
As shown in fig. 4, the apparatus provided in this embodiment includes: a determination module 41 and a processing module 42; the determining module 41 is configured to determine a maximum voltage drop value in an effective charging process of a lithium battery system, where the maximum voltage drop value is a maximum value of a voltage difference between a first time and a second time of a single battery in the lithium battery system, and the first time is before the second time; the processing module 42 is configured to, if the maximum voltage drop value is greater than 0, determine whether the maximum voltage drop value is greater than a preset threshold, determine a short circuit in the lithium battery if the maximum voltage drop value is greater than the preset threshold, and generate alarm information of different levels; the processing module 42 is further configured to determine a corresponding control measure according to the level of the alarm information.
Further, the processing module 42 is specifically configured to: and judging whether the maximum voltage drop value is greater than a first preset threshold value or not, and generating primary alarm information if the judgment result is yes.
Further, the processing module 42 is specifically configured to: if the maximum voltage drop value is larger than a first preset threshold value, judging whether the maximum voltage drop value is larger than a second preset threshold value, and generating secondary alarm information if the judgment result is yes; wherein the first preset threshold is smaller than the second preset threshold.
Further, the processing module 42 is specifically configured to: if the maximum voltage drop value is larger than a second preset threshold, judging whether the maximum voltage drop value is larger than a third preset threshold, and generating three-level alarm information if the judgment result is yes; wherein the second preset threshold is smaller than the third preset threshold.
Further, the processing module 42 is specifically configured to: if the alarm information is primary alarm information or secondary alarm information, the primary alarm information or the secondary alarm information is sent to a terminal to indicate target personnel to take corresponding measures; and if the alarm information is the third-level alarm information, the main contactor of the battery management system BMS is controlled to be disconnected so as to control the BMS to stop charging the lithium battery system.
Further, the determining module 41 is specifically configured to: collecting the voltage value of each battery monomer in the lithium battery system at each set moment; respectively calculating the difference value between the voltage value of each battery cell at a first moment and a second moment, wherein the first moment and the second moment are two adjacent set moments and the first moment is before the second moment; determining the maximum difference value of all the battery cells as the maximum voltage drop value; wherein the time interval between every two adjacent set moments is 1 second.
Further, the determining module 41 is further configured to: collecting a current value in the charging process of the lithium battery system in real time; and if the current value is larger than a preset current threshold value, judging that the lithium battery system is in the effective charging process.
For detailed functional description of each module in this embodiment, reference is made to the description of the embodiment of the method, and the detailed description is not provided herein.
Fig. 5 is a schematic diagram of a hardware structure of an electronic device according to an embodiment of the present invention. As shown in fig. 5, the electronic device 50 provided in the present embodiment includes: at least one processor 501 and memory 502. The processor 501 and the memory 502 are connected by a bus 503.
In a specific implementation process, the at least one processor 501 executes computer-executable instructions stored in the memory 502, so that the at least one processor 501 executes the internal short circuit processing method for a lithium battery in the foregoing method embodiment.
In this embodiment, the electronic device may be a terminal, such as a mobile phone, a computer, and the like.
For a specific implementation process of the processor 501, reference may be made to the above method embodiments, which implement the similar principle and technical effect, and this embodiment is not described herein again.
In the embodiment shown in fig. 5, it should be understood that the Processor may be a Central Processing Unit (CPU), other general purpose processors, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the present invention may be embodied directly in a hardware processor, or in a combination of the hardware and software modules within the processor.
The memory may comprise high speed RAM memory and may also include non-volatile storage NVM, such as at least one disk memory.
The bus may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended ISA (EISA) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, the buses in the figures of the present application are not limited to only one bus or one type of bus.
Another embodiment of the present application provides a computer-readable storage medium, where computer-executable instructions are stored, and when a processor executes the computer-executable instructions, the method for processing an internal short circuit of a lithium battery in the foregoing method embodiments is implemented.
The computer-readable storage medium may be implemented by any type of volatile or non-volatile memory device or combination thereof, such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disk. Readable storage media can be any available media that can be accessed by a general purpose or special purpose computer.
An exemplary readable storage medium is coupled to the processor such the processor can read information from, and write information to, the readable storage medium. Of course, the readable storage medium may also be an integral part of the processor. The processor and the readable storage medium may reside in an Application Specific Integrated Circuits (ASIC). Of course, the processor and the readable storage medium may also reside as discrete components in the apparatus.
Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (7)
1. A method for processing an internal short circuit of a lithium battery is characterized by comprising the following steps:
in the effective charging process of a lithium battery system, collecting the voltage value of each battery monomer in the lithium battery system at each set moment, respectively calculating the difference value between the voltage values of each battery monomer at a first moment and a second moment, and determining the maximum difference value of all the battery monomers as the maximum voltage drop value, wherein the first moment and the second moment are two adjacent moments in the set moments, and the first moment is before the second moment;
if the maximum voltage drop value is larger than 0, judging whether the maximum voltage drop value is larger than a preset threshold value, and if so, determining short circuit in the lithium battery and generating alarm information of different levels;
determining corresponding control measures according to the level of the alarm information;
the judging whether the maximum voltage drop value is greater than a preset threshold value or not, and generating alarm information of different levels if the judging result is yes, includes:
judging whether the maximum voltage drop value is larger than a first preset threshold value or not, and generating first-level alarm information when the judgment result is yes;
if the maximum voltage drop value is larger than a first preset threshold value, judging whether the maximum voltage drop value is larger than a second preset threshold value, and generating secondary alarm information if the judgment result is yes; wherein the first preset threshold is smaller than the second preset threshold;
if the maximum voltage drop value is larger than a second preset threshold, judging whether the maximum voltage drop value is larger than a third preset threshold, and generating three-level alarm information if the judgment result is yes; wherein the second preset threshold is smaller than the third preset threshold.
2. The method of claim 1, wherein determining the corresponding control measure according to the level of the alarm information comprises:
if the alarm information is primary alarm information or secondary alarm information, the primary alarm information or the secondary alarm information is sent to a terminal to indicate target personnel to take corresponding measures;
and if the alarm information is the third-level alarm information, the main contactor of the battery management system BMS is controlled to be disconnected so as to control the BMS to stop charging the lithium battery system.
3. Method according to any of claims 1-2, characterized in that the time interval between every two adjacent set moments is 1 second.
4. The method according to any one of claims 1-2, further comprising: judging whether the lithium battery system is in the effective charging process:
collecting a current value in the charging process of the lithium battery system in real time;
and if the current value is larger than a preset current threshold value, judging that the lithium battery system is in the effective charging process.
5. An internal short circuit processing apparatus of a lithium battery, comprising:
the determining module is used for acquiring voltage values of each battery monomer in the lithium battery system at each set moment in the effective charging process of the lithium battery system, respectively calculating a difference value between the voltage values of each battery monomer at a first moment and a second moment, and determining the maximum difference value of all the battery monomers as a maximum voltage drop value, wherein the first moment and the second moment are two adjacent moments in the set moments and the first moment is before the second moment;
the processing module is used for judging whether the maximum voltage drop value is larger than a preset threshold value or not if the maximum voltage drop value is larger than 0, determining short circuit in the lithium battery if the judgment result is yes, and generating alarm information of different levels;
the processing module is also used for determining corresponding control measures according to the grade of the alarm information;
the processing module is specifically configured to: judging whether the maximum voltage drop value is larger than a first preset threshold value or not, and generating first-level alarm information when the judgment result is yes;
if the maximum voltage drop value is larger than a first preset threshold value, judging whether the maximum voltage drop value is larger than a second preset threshold value, and generating secondary alarm information if the judgment result is yes; wherein the first preset threshold is smaller than the second preset threshold;
if the maximum voltage drop value is larger than a second preset threshold, judging whether the maximum voltage drop value is larger than a third preset threshold, and generating three-level alarm information if the judgment result is yes; wherein the second preset threshold is smaller than the third preset threshold.
6. An electronic device, comprising: at least one processor and memory;
the memory stores computer-executable instructions;
the at least one processor executing the computer-executable instructions stored by the memory causes the at least one processor to perform the method of treating an internal short circuit of a lithium battery as claimed in any one of claims 1 to 4.
7. A computer-readable storage medium, wherein the computer-readable storage medium stores computer-executable instructions, and when a processor executes the computer-executable instructions, the method for treating an internal short circuit of a lithium battery according to any one of claims 1 to 4 is implemented.
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| CN112180266A (en) * | 2020-09-21 | 2021-01-05 | 上海理工大学 | Tracking early warning method for whole process of short circuit in battery |
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| CN114264961B (en) * | 2021-12-23 | 2023-09-15 | 蜂巢能源科技(无锡)有限公司 | Method and device for detecting short circuit in battery cell and electronic equipment |
| CN115932606A (en) * | 2022-12-02 | 2023-04-07 | 中国民航大学 | Lithium ion battery thermal runaway grading early warning system based on gas monitoring |
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