CN115389958A - Lithium ion battery operation safety evaluation method and system - Google Patents
Lithium ion battery operation safety evaluation method and system Download PDFInfo
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- CN115389958A CN115389958A CN202211330766.7A CN202211330766A CN115389958A CN 115389958 A CN115389958 A CN 115389958A CN 202211330766 A CN202211330766 A CN 202211330766A CN 115389958 A CN115389958 A CN 115389958A
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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]
- G01R31/378—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] specially adapted for the type of battery or accumulator
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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
- G01R31/387—Determining ampere-hour charge capacity or SoC
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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 lithium ion battery operation safety evaluation method, which comprises the following steps: step S1: the temperature detection module acquires a temperature value of the lithium ion battery in the operation process, and the current acquisition module acquires a current value of the lithium ion battery in the operation process and receives the acquired temperature value and current value; step S2: the server receives the current information, controls the time calculation module to calculate the current charging time, and the electric quantity calculation module obtains the current charging time and calculates the electric quantity value through the current value; and step S3: the data analysis module is used for carrying out battery operation analysis according to the received electric quantity value changes at different temperatures and different current values; and step S4: the data receiving module acquires the operation information of the lithium ion battery, transmits the operation information to the data analysis module, and the data analysis module receives the operation information to perform battery safe operation analysis.
Description
Technical Field
The invention relates to the technical field of safe operation of batteries, in particular to a method and a system for evaluating the operation safety of a lithium ion battery.
Background
The lithium ion battery has the advantages of high energy density, high working voltage, small volume, long cycle life, weak self-discharge, quick charge and discharge, no memory effect, good stability and the like, is widely applied to the fields of smart phones, notebook computers, unmanned planes, wearable equipment, electric automobiles and the like, and supports the rapid development iteration of consumer electronics and new energy trip modes. And with the increasing power generation ratio of renewable clean energy sources such as photovoltaic power generation, wind power generation, tidal power generation and the like, the lithium ion battery has attracted wide attention as an efficient energy storage medium. However, in recent years, safety accidents related to lithium ion batteries are not limited in news reports, and with the increasing variety of products of lithium ion batteries, application scenarios are more and more complicated and severe, higher requirements are also put on the safety of lithium ion batteries, and the safety problems are more and more concerned. The contradiction between high specific energy and safety problems greatly restricts the further development and application of lithium ion batteries.
In the prior art, the operation speed of the lithium ion battery is influenced along with the change of the internal temperature of the lithium ion battery in the operation process, the internal charging and discharging states of the lithium ion battery are changed when the temperature is changed, and the safe operation of the lithium ion battery cannot be managed and analyzed based on the temperature change, so the invention provides the method and the system for evaluating the operation safety of the lithium ion battery.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method and a system for evaluating the running safety of a lithium ion battery.
In order to achieve the purpose, the invention is realized by the following technical scheme: a lithium ion battery operation safety evaluation method comprises the following steps:
step S1: the server control temperature detection module acquires a temperature value of the lithium ion battery in the operation process and receives the acquired temperature value, and the server control current acquisition module acquires a current value of the lithium ion battery in the operation process and receives the acquired current value;
step S2: the server receives the current information, controls the time calculation module to calculate the current charging time, and the electric quantity calculation module obtains the current charging time and calculates the electric quantity value through the current value;
and step S3: the data analysis module is used for carrying out battery operation analysis according to the received electric quantity value changes at different temperatures and different current values;
and step S4: the data receiving module acquires the operation information of the lithium ion battery and transmits the operation information to the data analysis module, and the data analysis module receives the operation information to perform safe operation analysis on the battery.
Further, in step S1, when obtaining the temperature value and the current value, the specific steps are as follows:
step S11: acquiring a plurality of temperature values in T time, and acquiring a plurality of current values according to the temperature values;
step S12: arranging a plurality of temperature values in a sequence from small to large so that the obtained temperature values and the current values are correspondingly arranged;
step S13: extracting a minimum temperature value, a maximum temperature value, a first temperature value arranged in the middle position, a second temperature value arranged in the middle position between the minimum temperature value and the first temperature value, and a third temperature value arranged in the middle position between the maximum temperature value and the first temperature value by a server;
setting a first interval threshold value between the minimum temperature value and the second temperature value, a second interval threshold value between the second temperature value and the first temperature value, a third interval threshold value between the first temperature value and the third temperature value, and a fourth interval threshold value between the third temperature value and the maximum temperature value;
step S14: respectively selecting a first measurement value positioned at a first interval threshold value, a second measurement value positioned at a second interval threshold value, a third measurement value positioned at a third interval threshold value and a fourth measurement value positioned at a fourth interval threshold value, observing current values correspondingly measured under the first measurement value, the second measurement value, the third measurement value and the fourth measurement value when the temperature value is, selecting a maximum current value, and observing a threshold interval corresponding to the maximum current value.
Further, the relationship between the temperature value and the current value in the operation process of the lithium ion battery is analyzed according to the current value obtained by the temperature value, and the specific analysis steps are as follows:
step S141: establishing a plane rectangular coordinate system by taking the obtained temperature values as an X axis and the obtained current values as a Y axis;
step S142: the intersection point of the X axis and the Y axis is an origin, the X axis represents the intersection point one by one according to the size of the temperature value, and the Y axis is marked with the size of the corresponding current value;
step S143: and connecting the marked current values through a curve, observing the fluctuation state of the curve, and judging the change of the current values along with the rise of the temperature.
Further, in step S4, when the data analysis module analyzes the safe operation of the battery, the specific steps are as follows:
step S41: when the electric quantity value is the maximum value, setting the current value as a standard current value, setting the temperature value as a standard temperature value and setting the charging time as a standard charging time value;
step S42: setting the standard current value as BZDLz and the current value as DLz; the standard temperature value is BZWDz, and the temperature value is WDz; the standard charging time value is BZCCDSJz, and the charging time value is CDSJz; the internal resistance value of the battery is DZz; the rated battery storage value is XDz;
step S43: setting a safe operation reference value of the battery as AQYXz, and solving the safe operation reference value of the battery;
step S44: and the server sets a safety threshold and a danger threshold according to the acquired battery safe operation reference value, and judges the lithium ion battery safe operation according to the acquired battery safe operation reference value within the safety threshold or the danger threshold.
A lithium ion battery operation safety evaluation system comprises a temperature detection module, a current acquisition module, a time calculation module, an electric quantity calculation module, a data receiving module, a data analysis module and a server, wherein the temperature detection module, the current value acquisition module, the time calculation module, the electric quantity calculation module, the data receiving module and the data analysis module are respectively in data connection with the server;
the temperature detection module acquires a temperature value of the lithium ion battery in the operation process, the acquired temperature value is transmitted to the server, and the server controls the current acquisition module to acquire a current value of the lithium ion battery in the operation process;
the server receives the current information, controls the time calculation module to calculate the current charging time, and the electric quantity calculation module obtains the current charging time and calculates the electric quantity value through the current value;
the data analysis module is used for carrying out battery operation analysis according to the received electric quantity value changes at different temperatures and different current values;
the data receiving module acquires the operation information of the lithium ion battery and transmits the operation information to the data receiving module, and the data analysis module receives the operation information to perform safe operation analysis on the battery.
Further, when the temperature values are obtained, a plurality of current values are obtained according to the plurality of temperature values, and the plurality of temperature values are arranged from small to large, so that the obtained temperature values and the current values are arranged correspondingly;
extracting a minimum temperature value, a maximum temperature value, a first temperature value arranged in the middle position, a second temperature value arranged in the middle position between the minimum temperature value and the first temperature value, and a third temperature value arranged in the middle position between the maximum temperature value and the first temperature value, setting a first interval threshold value between the minimum temperature value and the second temperature value, a second interval threshold value between the second temperature value and the first temperature value, a third interval threshold value between the first temperature value and the third temperature value, and a fourth interval threshold value between the third temperature value and the maximum temperature value;
respectively selecting a first measurement value positioned at a first interval threshold value, a second measurement value positioned at a second interval threshold value, a third measurement value positioned at a third interval threshold value and a fourth measurement value positioned at a fourth interval threshold value, observing current values correspondingly measured under the first measurement value, the second measurement value, the third measurement value and the fourth measurement value when the temperature value is, selecting a maximum current value, and observing a threshold interval corresponding to the maximum current value;
if the maximum current value is positioned in the first interval threshold value, selecting all temperature value information contained in the first interval threshold value to carry in, correspondingly obtaining the current value, and selecting the maximum current value;
if the maximum current value is positioned at the threshold value of the second interval, selecting all temperature value information contained in the threshold value of the second interval for carrying in, correspondingly obtaining the current value, and selecting the maximum current value;
if the maximum current value is positioned in the threshold value of the third interval, selecting all temperature value information contained in the threshold value of the third interval for carrying in, correspondingly obtaining the current value, and selecting the maximum current value;
and if the maximum current value is positioned in the threshold value of the fourth interval, selecting all temperature value information contained in the threshold value of the fourth interval for carrying in, correspondingly obtaining the current value, and selecting the maximum current value.
Further, analyzing the relation between the temperature value and the current value in the operation process of the lithium ion battery according to the current value obtained by the temperature value;
the specific analysis process is as follows:
the acquired temperature values are used as an X axis, the acquired current values are used as a Y axis, a plane rectangular coordinate system is established, the intersection point of the X axis and the Y axis is used as an origin, the X axis represents the intersection point one by one according to the size of the temperature values, the Y axis marks the size of the corresponding current value, the marked current values are connected through a curve, the fluctuation state of the curve is observed, and the change of the current value along with the rise of the temperature is judged;
if the curve is in a trend of ascending first and then descending, judging that the current value is in a state of ascending first and then descending along with the rise of the temperature, and obtaining a voltage value corresponding to the maximum current value at an intersection point extending to an X axis at the vertex of the curve;
if the curve is in a gradually rising state all the time, judging that the current value gradually increases along with the increase of the temperature value;
if the curve is in a trend of descending first and then ascending, judging that the current value is in a descending first and then ascending state along with the temperature rise, leading a straight line perpendicular to a Y axis out of the top of the descending curve, forming a first intersection point with the Y axis, leading a straight line perpendicular to the Y axis out of the top of the ascending curve, forming a second intersection point with the Y axis, judging that the current value is maximum at the X lowest temperature if the position of the first intersection point is higher than the position of the second intersection point, and judging that the current value is maximum at the X highest temperature if the position of the first intersection point is lower than the position of the second intersection point;
if the curve is in a descending state, the current value is judged to be gradually reduced along with the increase of the temperature value.
Further, when the time calculation module calculates the current charging time, the server calculates corresponding current values of the extracted minimum temperature value, the maximum temperature value, the first temperature value, the second temperature value and the third temperature value, the calculated current values and the obtained maximum current values are timed by the time calculation module, and the current time is defined as the current time, and the electric quantity calculation module calculates the electric quantity value according to the obtained current values and the current time.
Further, the specific process of battery operation analysis is as follows:
arranging the obtained current values in the order from small to large, defining the arranged maximum current value as the maximum current value, defining the arranged minimum current value as the minimum current value, defining the current value arranged in the middle as the middle current value, dividing the obtained current values corresponding to the obtained current values into a group, obtaining the maximum current value, observing the current value at the time of the maximum current value, and judging by combining the current value with the current value;
if the current value is the maximum arranged current value, the larger the current value is, the larger the electric quantity value stored by the lithium ion battery is;
if the current value is the minimum arranged current value, judging that the smaller the current value is, the larger the electric quantity value stored by the lithium ion battery is;
if the current value is the middle current value of the arrangement, judging that the electric quantity value has no direct relation with the rise and the fall of the current value;
when the electric quantity value is the maximum value, the current value is set as a standard current value, the temperature value is a standard temperature value, and the charging time is a standard charging time value.
Further, when the data analysis module analyzes the safe operation of the battery, the following specific steps are performed:
the data analysis module receives the battery operation information, and calculates a battery safe operation reference value according to the battery operation information, and sets a standard current value as BZDLz and a current value as DLz; the standard temperature value is BZDDz, and the temperature value is WDz; the standard charging time value is BZCCDSJz, and the charging time value is CDSJz; the internal resistance value of the battery is DZz; the rated power storage value of the battery is XDz; solving a battery safe operation reference value;
the server sets a safety threshold and a danger threshold according to the acquired battery safe operation reference value, wherein the safety threshold value is smaller than the danger threshold value, when the acquired battery safe operation reference value is within the safety threshold range, the lithium ion battery is indicated to be safe to operate, and when the acquired battery safe operation reference value is within the danger threshold range, the lithium ion battery is indicated to be dangerous to operate;
setting a first danger interval, a second danger interval and a third danger interval according to a danger threshold, and when the acquired safe operation reference value of the battery is in the first danger interval, sending out a maintenance alarm by a server to locally overhaul the lithium ion battery; when the acquired safe operation reference value of the battery is in a second dangerous interval, the server sends out a battery danger alarm to carry out overall maintenance on the lithium ion battery; when the acquired safe operation reference value of the battery is in a third dangerous interval, the server sends out a battery replacement alarm to control the lithium ion battery connecting circuit to be powered off, so that the lithium ion battery is replaced.
The invention has the beneficial effects that:
1. according to the invention, the current value in the lithium ion battery is obtained based on the temperature change in the lithium ion battery, and the electric quantity values at different temperatures are obtained according to the current time during charging, so that the safe operation of the lithium ion battery can be managed and analyzed based on the temperature change, and the safety of the lithium ion battery in the operation process is improved.
2. The method analyzes the current change of the lithium ion battery through obtaining a plurality of temperature value changes, analyzes the current change of the lithium ion battery through the temperature change, obtains the electric quantity value based on the current change, and analyzes the influence of the temperature value on the electric quantity value in the operation process of the lithium ion battery.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a method step diagram of a lithium ion battery operation safety evaluation method according to the present invention;
fig. 2 is a schematic block diagram of a lithium ion battery operation safety evaluation system according to the present invention.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained by combining the specific embodiments.
In the present invention, please refer to fig. 1 and fig. 2, a lithium ion battery operation safety evaluation system includes a temperature detection module, a current acquisition module, a time calculation module, an electric quantity calculation module, a data receiving module, a data analysis module and a server, wherein the temperature detection module, the current value acquisition module, the time calculation module, the electric quantity calculation module, the data receiving module and the data analysis module are respectively in data connection with the server;
the temperature detection module acquires a temperature value of the lithium ion battery in the operation process, the acquired temperature value is transmitted to the server, and the server controls the current acquisition module to acquire a current value of the lithium ion battery in the operation process;
when the temperature value is obtained, obtaining a plurality of temperature values, obtaining a plurality of current values according to the plurality of temperature values, and arranging the plurality of temperature values according to a sequence from small to large so that the obtained temperature values and the current values are arranged correspondingly;
extracting a minimum temperature value, a maximum temperature value, a first temperature value arranged in the middle position, a second temperature value arranged in the middle position between the minimum temperature value and the first temperature value, and a third temperature value arranged in the middle position between the maximum temperature value and the first temperature value, setting a first interval threshold value between the minimum temperature value and the second temperature value, a second interval threshold value between the second temperature value and the first temperature value, a third interval threshold value between the first temperature value and the third temperature value, and a fourth interval threshold value between the third temperature value and the maximum temperature value;
respectively selecting a first measurement value positioned at a first interval threshold value, a second measurement value positioned at a second interval threshold value, a third measurement value positioned at a third interval threshold value and a fourth measurement value positioned at a fourth interval threshold value, observing current values correspondingly measured under the first measurement value, the second measurement value, the third measurement value and the fourth measurement value when the temperature value is, selecting a maximum current value, and observing a threshold interval corresponding to the maximum current value;
if the maximum current value is positioned in the first interval threshold value, selecting all temperature value information contained in the first interval threshold value to carry in, correspondingly obtaining the current value, and selecting the maximum current value;
if the maximum current value is positioned at the threshold value of the second interval, selecting all temperature value information contained in the threshold value of the second interval for carrying in, correspondingly obtaining the current value, and selecting the maximum current value;
if the maximum current value is positioned in the threshold value of the third interval, selecting all temperature value information contained in the threshold value of the third interval for carrying in, correspondingly obtaining the current value, and selecting the maximum current value;
if the maximum current value is positioned in the threshold value of the fourth interval, selecting all temperature value information contained in the threshold value of the fourth interval for carrying in, correspondingly obtaining the current value, and selecting the maximum current value;
the maximum current value is recorded as: ZDFLz;
analyzing the relation between the temperature value and the current value in the operation process of the lithium ion battery according to the current value obtained by the temperature value;
the specific analysis process is as follows:
the obtained temperature values are used as an X axis, the obtained current values are used as a Y axis, a plane rectangular coordinate system is established, the intersection point of the X axis and the Y axis is used as an origin, the X axis represents the intersection point on the X axis one by one according to the size of the temperature values, the Y axis marks the size of the corresponding current value, the marked current values are connected through a curve, the fluctuation state of the curve is observed, and the change of the current value along with the rise of the temperature is judged;
if the curve is in a trend of ascending first and then descending, judging that the current value is in a state of ascending first and then descending along with the rise of the temperature, and obtaining a voltage value corresponding to the maximum current value at an intersection point extending to an X axis at the vertex of the curve;
if the curve is in a gradually rising state all the time, judging that the current value gradually increases along with the increase of the temperature value;
if the curve is in a trend of descending first and then ascending, judging that the current value is in a descending first and then ascending state along with the temperature rise, leading a straight line perpendicular to a Y axis out of the top of the descending curve, forming a first intersection point with the Y axis, leading a straight line perpendicular to the Y axis out of the top of the ascending curve, forming a second intersection point with the Y axis, judging that the current value is maximum at the X lowest temperature if the position of the first intersection point is higher than the position of the second intersection point, and judging that the current value is maximum at the X highest temperature if the position of the first intersection point is lower than the position of the second intersection point;
if the curve is in a descending state, the current value is judged to be gradually reduced along with the increase of the temperature value.
The server receives the current information, controls the time calculation module to calculate the current charging time, and the electric quantity calculation module obtains the current charging time and calculates the electric quantity value through the current value;
when the time calculation module calculates the current charging time, the server respectively calculates corresponding current values of the extracted minimum temperature value, the extracted maximum temperature value, the extracted first temperature value, the extracted second temperature value and the extracted third temperature value, the calculated current values and the acquired maximum current values are respectively timed through the time calculation module and are defined as current time, and the electric quantity calculation module calculates the electric quantity value according to the acquired current values and the current time;
when the electric quantity value is obtained, the specific process is as follows;
setting the electric quantity value as Q, the current value as I and the current time as T;
obtaining Q = I × T according to the obtained parameter values;
the data analysis module is used for carrying out battery operation analysis according to the received electric quantity value changes at different temperatures and different current values;
the battery operation analysis is carried out by the following specific processes:
arranging the obtained current values in the order from small to large, defining the arranged maximum current value as the maximum current value, defining the arranged minimum current value as the minimum current value, defining the current value arranged in the middle as the middle current value, dividing the obtained current values corresponding to the obtained current values into a group, obtaining the maximum current value, observing the current value at the time of the maximum current value, and judging by combining the current value with the current value;
if the current value is the maximum arranged current value, the larger the current value is, the larger the electric quantity value stored by the lithium ion battery is;
if the current value is the minimum arranged current value, judging that the smaller the current value is, the larger the electric quantity value stored by the lithium ion battery is;
if the current value is the middle current value of the arrangement, judging that the electric quantity value has no direct relation with the rise and the fall of the current value;
when the electric quantity value is the maximum value, setting the current value as a standard current value, setting the temperature value as a standard temperature value and setting the charging time as a standard charging time value;
the data receiving module acquires the operation information of the lithium ion battery and transmits the operation information to the data analysis module, and the data analysis module receives the operation information to perform safe operation analysis on the battery.
The battery operation information comprises a current value, a charging time value, a temperature value, a battery internal resistance value and a battery rated power storage value;
when the data analysis module analyzes the safe operation of the battery, the following concrete steps are carried out:
the data analysis module receives the battery operation information, and calculates a battery safe operation reference value according to the battery operation information, and sets a standard current value as BZDLz and a current value as DLz; the standard temperature value is BZDDz, and the temperature value is WDz; the standard charging time value is BZCCDSJz, and the charging time value is CDSJz; the internal resistance value of the battery is DZz; the rated battery storage value is XDz;
the method comprises the following steps of solving a battery safe operation reference value, setting the battery safe operation reference value as AQYXz, and specifically referring to the following formula:
it should be noted that, where K is a constant and K > 0, the greater the reference value for safe operation of the battery, the greater the risk of operation of the lithium battery.
The server sets a safety threshold and a danger threshold according to the acquired battery safe operation reference value, wherein the safety threshold value is smaller than the danger threshold value, when the acquired battery safe operation reference value is within the safety threshold range, the lithium ion battery is indicated to be safe to operate, and when the acquired battery safe operation reference value is within the danger threshold range, the lithium ion battery is indicated to be dangerous to operate;
setting a first danger interval, a second danger interval and a third danger interval according to a danger threshold, and when the acquired safe operation reference value of the battery is in the first danger interval, sending out a maintenance alarm by a server to locally overhaul the lithium ion battery; when the acquired safe operation reference value of the battery is in a second dangerous interval, the server sends out a battery danger alarm to carry out overall maintenance on the lithium ion battery; when the acquired safe operation reference value of the battery is in a third dangerous interval, the server sends out a battery replacement alarm to control the lithium ion battery connecting circuit to be powered off, so that the lithium ion battery is replaced.
The invention discloses a lithium ion battery operation safety evaluation method, which comprises the following steps:
step S1: the server control temperature detection module acquires a temperature value of the lithium ion battery in the operation process and receives the acquired temperature value, and the server control current acquisition module acquires a current value of the lithium ion battery in the operation process and receives the acquired current value;
when the temperature value and the current value are acquired, the method specifically comprises the following steps:
step S11: acquiring a plurality of temperature values in T time, and acquiring a plurality of current values according to the temperature values;
step S12: arranging the temperature values in a sequence from small to large so that the obtained temperature values and the current values are arranged correspondingly;
step S13: extracting a minimum temperature value, a maximum temperature value, a first temperature value arranged in the middle position, a second temperature value arranged in the middle position between the minimum temperature value and the first temperature value, and a third temperature value arranged in the middle position between the maximum temperature value and the first temperature value by a server;
setting a first interval threshold value between the minimum temperature value and the second temperature value, a second interval threshold value between the second temperature value and the first temperature value, a third interval threshold value between the first temperature value and the third temperature value, and a fourth interval threshold value between the third temperature value and the maximum temperature value;
step S14: respectively selecting a first measurement value positioned at a first interval threshold value, a second measurement value positioned at a second interval threshold value, a third measurement value positioned at a third interval threshold value and a fourth measurement value positioned at a fourth interval threshold value, observing current values correspondingly measured when the temperature values are under the first measurement value, the second measurement value, the third measurement value and the fourth measurement value, selecting a maximum current value, and observing a threshold interval corresponding to the maximum current value;
analyzing the relation between the temperature value and the current value in the operation process of the lithium ion battery according to the current value obtained by the temperature value, wherein the specific analysis steps are as follows:
step S141: establishing a plane rectangular coordinate system by taking the obtained temperature values as an X axis and the obtained current values as a Y axis;
step S142: the intersection point of the X axis and the Y axis is an original point, the X axis represents one by one according to the size of the temperature value, and the size of the corresponding current value is marked on the Y axis;
step S143: connecting the marked current values through a curve, observing the fluctuation state of the curve, and judging the change of the current values along with the rise of the temperature;
step S2: the server receives the current information, controls the time calculation module to calculate the current charging time, and the electric quantity calculation module obtains the current charging time and calculates the electric quantity value through the current value;
and step S3: the data analysis module is used for carrying out battery operation analysis according to the received electric quantity value changes at different temperatures and different current values;
and step S4: the data receiving module acquires the operation information of the lithium ion battery and transmits the operation information to the data analysis module, and the data analysis module receives the operation information to perform safe operation analysis on the battery.
When the data analysis module analyzes the safe operation of the battery, the specific steps are as follows:
step S41: when the electric quantity value is the maximum value, setting the current value as a standard current value, setting the temperature value as a standard temperature value and setting the charging time as a standard charging time value;
step S42: setting the standard current value as BZDLz and the current value as DLz; the standard temperature value is BZDDz, and the temperature value is WDz; the standard charging time value is BZCDSSJz, and the charging time value is CDSJz; the internal resistance value of the battery is DZz; the rated battery storage value is XDz;
step S43: setting a safe operation reference value of the battery as AQYXz, and solving the safe operation reference value of the battery;
step S44: and the server sets a safety threshold and a danger threshold according to the acquired battery safe operation reference value, and judges the lithium ion battery operation safety according to the condition that the acquired battery safe operation reference value is within the safety threshold or the danger threshold.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A lithium ion battery operation safety evaluation method is characterized by comprising the following steps:
step S1: the server control temperature detection module acquires a temperature value of the lithium ion battery in the operation process and receives the acquired temperature value, and the server control current acquisition module acquires a current value of the lithium ion battery in the operation process and receives the acquired current value;
step S2: the server receives the current information, controls the time calculation module to calculate the current charging time, and the electric quantity calculation module obtains the current charging time and calculates the electric quantity value through the current value;
and step S3: the data analysis module is used for carrying out battery operation analysis according to the received electric quantity value changes at different temperatures and different current values;
and step S4: the data receiving module acquires the operation information of the lithium ion battery and transmits the operation information to the data analysis module, and the data analysis module receives the operation information to perform safe operation analysis on the battery.
2. The lithium ion battery operation safety evaluation method according to claim 1, wherein in step S1, when obtaining the temperature value and the current value, the specific steps are as follows:
step S11: acquiring a plurality of temperature values in T time, and acquiring a plurality of current values according to the plurality of temperature values;
step S12: arranging a plurality of temperature values in a sequence from small to large so that the obtained temperature values and the current values are correspondingly arranged;
step S13: extracting a minimum temperature value, a maximum temperature value, a first temperature value arranged in the middle position, a second temperature value arranged in the middle position between the minimum temperature value and the first temperature value, and a third temperature value arranged in the middle position between the maximum temperature value and the first temperature value by a server;
setting a first interval threshold value between the minimum temperature value and the second temperature value, a second interval threshold value between the second temperature value and the first temperature value, a third interval threshold value between the first temperature value and the third temperature value, and a fourth interval threshold value between the third temperature value and the maximum temperature value;
step S14: respectively selecting a first measurement value positioned at a first interval threshold value, a second measurement value positioned at a second interval threshold value, a third measurement value positioned at a third interval threshold value and a fourth measurement value positioned at a fourth interval threshold value, observing current values correspondingly measured under the first measurement value, the second measurement value, the third measurement value and the fourth measurement value when the temperature value is, selecting a maximum current value, and observing a threshold interval corresponding to the maximum current value.
3. The lithium ion battery operation safety evaluation method according to claim 2, characterized in that the relationship between the temperature value and the current value in the lithium ion battery operation process is analyzed according to the current value obtained from the temperature value, and the specific analysis steps are as follows:
step S141: establishing a plane rectangular coordinate system by taking the obtained temperature values as an X axis and the obtained current values as a Y axis;
step S142: the intersection point of the X axis and the Y axis is an origin, the X axis represents the intersection point one by one according to the size of the temperature value, and the Y axis is marked with the size of the corresponding current value;
step S143: and connecting the marked current values through a curve, observing the fluctuation state of the curve, and judging the change of the current values along with the rise of the temperature.
4. The method for evaluating the operation safety of the lithium ion battery according to claim 1, wherein in the step S4, when the data analysis module analyzes the safe operation of the battery, the specific steps are as follows:
step S41: when the electric quantity value is the maximum value, setting the current value as a standard current value, setting the temperature value as a standard temperature value and setting the charging time as a standard charging time value;
step S42: setting the standard current value as BZDLz and the current value as DLz; the standard temperature value is BZDDz, and the temperature value is WDz; the standard charging time value is BZCCDSJz, and the charging time value is CDSJz; the internal resistance value of the battery is DZz; the rated battery storage value is XDz;
step S43: setting a safe operation reference value of the battery as AQYXz, and solving the safe operation reference value of the battery;
step S44: and the server sets a safety threshold and a danger threshold according to the acquired battery safe operation reference value, and judges the lithium ion battery safe operation according to the acquired battery safe operation reference value within the safety threshold or the danger threshold.
5. A lithium ion battery operation safety evaluation system is suitable for the lithium ion battery operation safety evaluation method of any one of claims 1 to 4, and is characterized by comprising a temperature detection module, a current acquisition module, a time calculation module, an electric quantity calculation module, a data receiving module, a data analysis module and a server, wherein the temperature detection module, the current value acquisition module, the time calculation module, the electric quantity calculation module, the data receiving module and the data analysis module are respectively in data connection with the server;
the temperature detection module acquires a temperature value of the lithium ion battery in the operation process, the acquired temperature value is transmitted to the server, and the server controls the current acquisition module to acquire a current value of the lithium ion battery in the operation process;
the server receives the current information, controls the time calculation module to calculate the current charging time, and the electric quantity calculation module obtains the current charging time and calculates the electric quantity value through the current value;
the data analysis module is used for carrying out battery operation analysis according to the received electric quantity value changes at different temperatures and different current values;
the data receiving module acquires the operation information of the lithium ion battery and transmits the operation information to the data receiving module, and the data analysis module receives the operation information to perform safe operation analysis on the battery.
6. The lithium ion battery operation safety evaluation system according to claim 5, wherein when the temperature values are obtained, a plurality of current values are obtained according to the plurality of temperature values, and the plurality of temperature values are arranged in a descending order, so that the obtained temperature values and the current values are arranged correspondingly;
extracting a minimum temperature value, a maximum temperature value, a first temperature value arranged in the middle position, a second temperature value arranged in the middle position between the minimum temperature value and the first temperature value, and a third temperature value arranged in the middle position between the maximum temperature value and the first temperature value, setting a first interval threshold value between the minimum temperature value and the second temperature value, a second interval threshold value between the second temperature value and the first temperature value, a third interval threshold value between the first temperature value and the third temperature value, and a fourth interval threshold value between the third temperature value and the maximum temperature value;
respectively selecting a first measurement value positioned at a first interval threshold value, a second measurement value positioned at a second interval threshold value, a third measurement value positioned at a third interval threshold value and a fourth measurement value positioned at a fourth interval threshold value, observing current values correspondingly measured under the first measurement value, the second measurement value, the third measurement value and the fourth measurement value when the temperature value is, selecting a maximum current value, and observing a threshold interval corresponding to the maximum current value;
if the maximum current value is positioned in the first interval threshold value, selecting all temperature value information contained in the first interval threshold value to carry in, correspondingly obtaining the current value, and selecting the maximum current value;
if the maximum current value is positioned in the second interval threshold value, selecting all temperature value information contained in the second interval threshold value for carrying in, obtaining a current value correspondingly, and selecting the maximum current value;
if the maximum current value is positioned in the threshold value of the third interval, selecting all temperature value information contained in the threshold value of the third interval for carrying in, correspondingly obtaining the current value, and selecting the maximum current value;
and if the maximum current value is positioned in the threshold value of the fourth interval, selecting all temperature value information contained in the threshold value of the fourth interval for carrying in, correspondingly obtaining the current value, and selecting the maximum current value.
7. The lithium ion battery operation safety evaluation system according to claim 6, wherein the relationship between the temperature value and the current value in the operation process of the lithium ion battery is analyzed according to the current value obtained from the temperature value;
the specific analysis process is as follows:
the acquired temperature values are used as an X axis, the acquired current values are used as a Y axis, a plane rectangular coordinate system is established, the intersection point of the X axis and the Y axis is used as an origin, the X axis represents the intersection point one by one according to the size of the temperature values, the Y axis marks the size of the corresponding current value, the marked current values are connected through a curve, the fluctuation state of the curve is observed, and the change of the current value along with the rise of the temperature is judged;
if the curve is in a trend of ascending first and then descending, judging that the current value is in a state of ascending first and then descending along with the rise of the temperature, and obtaining a voltage value corresponding to the maximum current value at an intersection point extending to an X axis at the vertex of the curve;
if the curve is in a gradually rising state all the time, judging that the current value gradually increases along with the increase of the temperature value;
if the curve is in a trend of descending first and then ascending, judging that the current value is in a descending first and then ascending state along with the temperature rise, leading a straight line perpendicular to a Y axis out of the top of the descending curve, forming a first intersection point with the Y axis, leading a straight line perpendicular to the Y axis out of the top of the ascending curve, forming a second intersection point with the Y axis, judging that the current value is maximum at the X lowest temperature if the position of the first intersection point is higher than the position of the second intersection point, and judging that the current value is maximum at the X highest temperature if the position of the first intersection point is lower than the position of the second intersection point;
if the curve is in a descending state, the current value is judged to be gradually reduced along with the increase of the temperature value.
8. The lithium ion battery operation safety evaluation system according to claim 5, wherein the time calculation module calculates the current charging time by the server, and calculates corresponding current values from the extracted minimum temperature value, maximum temperature value, first temperature value, second temperature value, and third temperature value, and counts the calculated current values and the obtained maximum current values by the time calculation module, and defines the current time as the current value, and the electric quantity calculation module calculates the electric quantity value according to the obtained current values and the current time.
9. The lithium ion battery operation safety evaluation system according to claim 5, wherein the battery operation analysis is performed by the following specific processes:
arranging the obtained current values in the order from small to large, defining the arranged maximum current value as the maximum current value, defining the arranged minimum current value as the minimum current value, defining the current value arranged in the middle as the middle current value, dividing the obtained current values corresponding to the obtained current values into a group, obtaining the maximum current value, observing the current value at the time of the maximum current value, and judging by combining the current value with the current value;
if the current value is the maximum arranged current value, the larger the current value is, the larger the electric quantity value stored by the lithium ion battery is;
if the current value is the minimum arranged current value, the smaller the current value is, the larger the electric quantity value stored by the lithium ion battery is;
if the current value is the middle current value of the arrangement, judging that the electric quantity value has no direct relation with the rise and the fall of the current value;
when the electric quantity value is the maximum value, the current value is set as a standard current value, the temperature value is a standard temperature value, and the charging time is a standard charging time value.
10. The lithium ion battery operation safety evaluation system according to claim 5, wherein when the data analysis module analyzes the battery safe operation, the following is specifically performed:
the data analysis module receives the battery operation information, and calculates a battery safe operation reference value according to the battery operation information, and sets a standard current value as BZDLz and a current value as DLz; the standard temperature value is BZWDz, and the temperature value is WDz; the standard charging time value is BZCCDSJz, and the charging time value is CDSJz; the internal resistance value of the battery is DZz; the rated battery storage value is XDz; solving a reference value for safe operation of the battery;
the server sets a safety threshold and a danger threshold according to the acquired battery safe operation reference value, wherein the safety threshold value is smaller than the danger threshold value, when the acquired battery safe operation reference value is within the range of the safety threshold, the lithium ion battery is safe to operate, and when the acquired battery safe operation reference value is within the range of the danger threshold, the lithium ion battery is dangerous to operate;
setting a first danger interval, a second danger interval and a third danger interval according to a danger threshold, and when the acquired safe operation reference value of the battery is in the first danger interval, sending out a maintenance alarm by a server to locally overhaul the lithium ion battery; when the acquired safe operation reference value of the battery is in a second dangerous interval, the server sends out a battery danger alarm to carry out overall maintenance on the lithium ion battery; when the acquired safe operation reference value of the battery is in a third dangerous interval, the server sends out a battery replacement alarm to control the lithium ion battery connecting circuit to be powered off, so that the lithium ion battery is replaced.
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