CN114545250A - Quality detection method and system for laminated soft package lithium battery - Google Patents
Quality detection method and system for laminated soft package lithium battery Download PDFInfo
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- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
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- G01R31/389—Measuring internal impedance, internal conductance or related variables
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- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
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Abstract
The detection method comprises the steps of collecting battery data information of the laminated soft package lithium battery, and judging whether the laminated soft package lithium battery has a quality abnormal condition according to the battery data information; if the laminated soft package lithium battery has the quality abnormal condition, generating corresponding warning information according to the quality abnormal condition of the laminated soft package lithium battery; the alarm information is used for alarming the management terminal. The application can improve the safety in utilization of the laminated soft package lithium battery.
Description
Technical Field
The application relates to the technical field of lithium batteries, in particular to a method and a system for detecting the quality of a laminated soft package lithium battery.
Background
At present, with the increasing severity of the problems of environmental pollution, energy consumption and the like, the fields of new energy automobiles, energy storage and the like are generally concerned all the year around. Lithium ion batteries have been the focus of research in recent years due to their advantages of environmental friendliness, high energy density, long cycle life, and the like.
The lithium ion battery is divided into a wound battery and a laminated battery in terms of manufacturing process, and compared with the wound battery, the laminated soft package lithium battery has the characteristics of flexible design, light weight, small internal resistance, difficult explosion, multiple cycle times and the like, and is widely used in new energy power lithium batteries.
In view of the above-mentioned related technologies, the inventor found that since the laminated soft-package lithium battery is a power supply element, power needs to be supplied all the time when the laminated soft-package lithium battery is used, and if the quality of the lithium battery does not reach the standard, dangerous accidents such as explosion or fire may occur, and further, the safety of a user is threatened.
Disclosure of Invention
In order to improve the use safety of the laminated soft package lithium battery, the application provides a quality detection method and system of the laminated soft package lithium battery.
In a first aspect, the application provides a quality detection method for a laminated soft package lithium battery.
A quality detection method for a laminated soft package lithium battery adopts the following technical scheme: the detection method comprises the following steps of,
collecting battery data information of a laminated soft package lithium battery, and judging whether the laminated soft package lithium battery has a quality abnormal condition or not according to the battery data information;
if the laminated soft package lithium battery has the quality abnormal condition, generating corresponding warning information according to the quality abnormal condition of the laminated soft package lithium battery; and the alarm information is used for alarming the management terminal.
By adopting the technical scheme, whether the laminated soft package lithium battery has the abnormal quality condition or not is judged according to the battery data information of the laminated soft package lithium battery, if the abnormal quality condition exists, corresponding warning information is generated according to the abnormal quality condition, and the warning information is utilized to warn the management terminal, so that the abnormal condition of the battery can be timely dealt with and corresponding measures can be taken, the use safety of the laminated soft package lithium battery is improved, and the occurrence of safety accidents caused by quality problems in the use process is reduced.
Optionally, the specific step of collecting the battery data information of the laminated soft-package lithium battery includes,
the method comprises the steps of obtaining internal resistance data, temperature data and internal air pressure data of the laminated soft package lithium battery, and generating battery data information of the laminated soft package lithium battery according to the internal resistance data, the temperature data and the internal air pressure data.
By adopting the technical scheme, the internal resistance data, the temperature data and the internal air pressure data of the laminated soft package lithium battery are used as battery data information, so that the comprehensiveness and the accuracy of the detection of the quality abnormity condition of the laminated soft package lithium battery are improved.
Optionally, the specific step of judging whether the laminated soft package lithium battery has a quality abnormal condition according to the battery data information includes,
analyzing the battery data information to obtain internal resistance data, temperature data and internal air pressure data;
judging whether the laminated soft-package lithium battery has abnormal internal resistance according to the internal resistance data, and if the laminated soft-package lithium battery does not have abnormal internal resistance, judging that the laminated soft-package lithium battery does not have the abnormal quality condition; if the internal resistance of the laminated soft package lithium battery is abnormal, judging whether the laminated soft package lithium battery has abnormal temperature according to the temperature data;
if the laminated soft package lithium battery is not abnormal in temperature, determining that the laminated soft package lithium battery is abnormal firstly; if the temperature of the laminated soft package lithium battery is abnormal, judging whether the temperature is abnormal due to over-low temperature, and if the temperature is abnormal due to over-low temperature, determining that the laminated soft package lithium battery has second abnormality; and if the temperature is abnormal due to overhigh temperature, determining that a third abnormality exists in the laminated soft package lithium battery.
By adopting the technical scheme, because the internal resistance is an important parameter for measuring the power performance of the lithium battery and evaluating the service life of the lithium battery, when the internal resistance is detected to be abnormal, whether the internal resistance is increased due to the aging of the battery is judged to be the first abnormality or not firstly, if the temperature abnormality does not exist, the internal resistance is possibly increased due to the long service time of the laminated soft package lithium battery; if the temperature is abnormal and the temperature is abnormal excessively, the internal resistance is increased probably due to the reduction of the lithium ion activity caused by low temperature, and the judgment of the abnormal condition is a second abnormality; if the temperature is too high, the chemical balance in the battery is damaged, the service life of the battery is shortened, and even dangerous accidents such as battery explosion and the like are caused, so that the battery can be judged to be a third abnormality; through the mode of judging for many times, the accuracy of detection is improved, and the management terminal is convenient to carry out corresponding processing according to different abnormal conditions.
Optionally, after determining the temperature abnormality as the over-temperature abnormality,
and judging whether the internal air pressure of the laminated soft package lithium battery is abnormal or not according to the internal air pressure data, and if so, determining that the laminated soft package lithium battery has a fourth abnormality.
By adopting the technical scheme, when the temperature rises, the electrolyte in the lithium battery can be vaporized or decomposed, so that a large amount of gas is generated, the gas pressure in the lithium battery rises, and when the gas pressure reaches the bearing limit of the battery safety valve, the battery safety valve can be opened, the internal gas is discharged, and the battery fails; therefore, when the temperature is judged to be overhigh and abnormal, whether the internal air pressure is abnormal or not is judged according to the internal air pressure data, and if the internal air pressure is abnormal, the fourth abnormality of the laminated soft package lithium battery can be determined, so that the management terminal can conveniently perform corresponding processing.
Optionally, the battery data information further includes voltage data; further comprising after determining that there is an internal air pressure anomaly in the laminated lithium-ion battery,
and judging whether the laminated soft package lithium battery has voltage abnormity according to the voltage data, and if so, determining that the laminated soft package lithium battery has a fifth abnormity.
Through adopting above-mentioned technical scheme, when lamination soft packet of lithium cell carries out charge-discharge, the inside intensification that lasts of battery, and the gas expansion that produces among the activation process can lead to the inside atmospheric pressure increase of battery, consequently, if lamination soft packet of lithium cell inside atmospheric pressure is unusual, through judging whether there is voltage anomaly, can judge whether because the inside atmospheric pressure increase that the battery overcharged or overdischarge arouses to confirm whether there is the fifth anomaly and take corresponding charge-discharge control measure.
Optionally, the specific step of judging whether the internal resistance abnormal condition exists in the laminated soft-package lithium battery according to the internal resistance data comprises,
comparing the internal resistance data with a preset internal resistance reference value, and if the internal resistance data exceeds the preset internal resistance reference value, determining that the internal resistance of the laminated soft-package lithium battery is abnormal; and if the internal resistance data does not exceed the preset internal resistance reference value, determining that the laminated soft-package lithium battery has no internal resistance abnormality.
By adopting the technical scheme, the discharge capacity of the battery is weakened due to overhigh internal resistance, so that the service time of the battery is shortened, and the internal resistance abnormality can be determined when the internal resistance data exceeds the preset internal resistance reference value; when the internal resistance data does not exceed the internal resistance reference value, determining that no internal resistance abnormality exists; through detecting the internal resistance data of the laminated soft package lithium battery, the internal resistance abnormal condition is convenient to monitor.
Optionally, the specific step of judging whether the laminated soft-package lithium battery has abnormal temperature according to the temperature data includes,
judging whether the temperature data is greater than a preset temperature maximum threshold or less than a preset temperature minimum threshold, if so, determining that the laminated soft-package lithium battery has abnormal temperature, and if not, determining that the laminated soft-package lithium battery does not have abnormal temperature; if the temperature data is greater than a preset temperature maximum threshold value, the temperature is abnormal due to overhigh temperature, and if the temperature data is less than a preset temperature minimum threshold value, the temperature is abnormal due to overlow temperature.
Through adopting above-mentioned technical scheme, because the high temperature or low enough can influence the lithium cell performance, serious perhaps shorten battery life even, consequently, if the temperature data of lamination soft packet of lithium cell is greater than the highest threshold value of predetermined temperature or is less than the minimum threshold value of predetermined temperature, can judge that the high temperature is unusual or the temperature is low unusually to be convenient for monitor the temperature abnormal conditions.
Optionally, the specific step of judging whether the laminated soft-package lithium battery has an abnormal internal air pressure according to the internal air pressure data includes,
comparing the internal air pressure data with a preset air pressure reference value, and if the internal air pressure data exceeds the preset air pressure reference value, determining that the internal air pressure of the laminated soft package lithium battery is abnormal; and if the internal air pressure data does not exceed the preset air pressure reference value, determining that the laminated soft package lithium battery has no internal air pressure abnormity.
Through adopting above-mentioned technical scheme, because the inside atmospheric pressure of lithium cell is too high can influence the battery performance, causes destructive influences such as weeping, drum end even to the battery outward appearance, consequently, if the inside atmospheric pressure of lithium cell is too high to exceed preset atmospheric pressure reference value, can judge to have inside atmospheric pressure unusual to be convenient for monitor the unusual condition of inside atmospheric pressure.
Optionally, the specific step of generating corresponding warning information according to the quality abnormal condition of the laminated soft package lithium battery includes,
if the quality abnormal condition is a first abnormality, generating first alarm information; or if the quality abnormal condition is a second abnormal condition, generating second alarm information; or if the quality abnormal condition is a third abnormal condition, generating third alarm information; or if the quality abnormal condition is a fourth abnormal condition, generating fourth alarm information; or, if the quality abnormal condition is a fifth abnormal condition, generating fifth alarm information.
By adopting the technical scheme, different warning information is generated according to different quality abnormal conditions to warn the management terminal, so that corresponding measures can be taken conveniently in time, and the pertinence, the real-time performance and the effectiveness of safety detection management of the laminated soft-package lithium battery are improved.
In a second aspect, the application further provides a quality detection system for the laminated soft package lithium battery.
A laminated soft package lithium battery quality detection system adopts the following technical scheme: the detection system comprises an acquisition module, an alarm module and a control processor;
the acquisition module is used for acquiring battery data information of the laminated soft package lithium battery;
the alarm module is used for sending alarm information to the management terminal to alarm;
the control processor, which is connected to the acquisition module and the alarm module, respectively, is configured to load and execute a computer program of any one of the methods of the first aspect
In summary, the present application includes at least one of the following beneficial technical effects:
1. judging whether the laminated soft package lithium battery has a quality abnormal condition or not according to the battery data information of the laminated soft package lithium battery, if the quality abnormal condition exists, generating corresponding alarm information according to the quality abnormal condition, and utilizing the alarm information to alarm a management terminal, so that the abnormal condition of the battery can be responded in time and corresponding measures can be taken conveniently, the use safety of the laminated soft package lithium battery is improved, and the occurrence of safety accidents caused by quality problems in the use process is reduced;
2. because the internal resistance is an important parameter for measuring the power performance of the lithium battery and evaluating the service life of the lithium battery, when the internal resistance is detected to be abnormal, whether the internal resistance is increased due to the aging of the battery probably caused by long service time of the laminated soft package lithium battery is judged to be the first abnormality or not firstly judged; if the temperature is abnormal and the temperature is abnormal excessively, the internal resistance is increased probably due to the reduction of the lithium ion activity caused by low temperature, and the judgment of the abnormal condition is a second abnormality; if the temperature is too high, the chemical balance in the battery is damaged, the service life of the battery is shortened, and even dangerous accidents such as battery explosion and the like are caused, so that the battery can be judged to be a third abnormality; the detection accuracy is improved through a mode of multiple judgments, and the management terminal can conveniently perform corresponding processing according to different abnormal conditions;
3. when the temperature rises, electrolyte in the lithium battery can be vaporized or decomposed, so that a large amount of gas is generated, the gas pressure in the lithium battery rises, and when the gas pressure reaches the bearing limit of the battery safety valve, the battery safety valve is opened, so that the internal gas is discharged and the battery fails; therefore, when the temperature is judged to be overhigh and abnormal, whether the internal air pressure is abnormal or not is judged according to the internal air pressure data, and if the internal air pressure is abnormal, the fourth abnormality of the laminated soft package lithium battery can be determined, so that the management terminal can conveniently perform corresponding processing.
Drawings
Fig. 1 is a first flowchart of a detection method according to an embodiment of the present application.
Fig. 2 is a second flow chart of the detection method according to an embodiment of the present application.
Fig. 3 is a third flow chart of a detection method according to an embodiment of the present application.
Fig. 4 is a fourth flowchart of a detection method according to an embodiment of the present application.
Fig. 5 is a fifth flowchart of a detection method according to an embodiment of the present application.
Fig. 6 is a sixth flowchart of a detection method according to an embodiment of the present application.
Fig. 7 is a seventh flowchart of a detection method according to an embodiment of the present application.
Fig. 8 is an eighth schematic flow chart of a detection method according to an embodiment of the present application.
Fig. 9 is a block diagram of a detection system according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is further described in detail below with reference to fig. 1-9 and the embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The embodiment of the application discloses a quality detection method for a laminated soft package lithium battery.
Referring to fig. 1, the detection method includes,
collecting battery data information of the laminated soft package lithium battery, and judging whether the laminated soft package lithium battery has a quality abnormal condition or not according to the battery data information;
if the laminated soft package lithium battery has the quality abnormal condition, generating corresponding warning information according to the quality abnormal condition of the laminated soft package lithium battery; the alarm information is used for alarming the management terminal.
The management terminal may be a mobile terminal of a manager, such as a mobile phone, a tablet computer, or a computer terminal in a management room.
In the embodiment, whether the laminated soft package lithium battery has the abnormal quality condition or not is judged according to the battery data information of the laminated soft package lithium battery, if the abnormal quality condition exists, corresponding warning information is generated according to the abnormal quality condition, and the warning information is used for warning the management terminal, so that the abnormal condition of the battery can be timely dealt with, corresponding measures can be taken, the use safety of the laminated soft package lithium battery is improved, and the occurrence of safety accidents caused by the quality problem in the use process is reduced.
As an implementation mode of collecting the battery data information of the laminated soft package lithium battery, the specific steps include,
the internal resistance data, the temperature data and the internal air pressure data of the laminated soft package lithium battery are obtained, and battery data information of the laminated soft package lithium battery is generated according to the internal resistance data, the temperature data and the internal air pressure data.
The internal resistance data can be acquired by an internal resistance tester connected with the laminated soft package lithium battery; the temperature data can be acquired by a temperature sensor arranged on the laminated soft package lithium battery, and the internal air pressure data can be acquired by a pressure sensor.
In the above embodiment, the internal resistance data, the temperature data and the internal air pressure data of the laminated soft package lithium battery are used as the battery data information, so that the comprehensiveness and the accuracy of the detection of the quality abnormal condition of the laminated soft package lithium battery are improved.
Referring to fig. 2, as an embodiment for determining whether the laminated soft-package lithium battery has the abnormal quality condition according to the battery data information, specific steps include,
analyzing the battery data information to obtain internal resistance data, temperature data and internal air pressure data;
judging whether the laminated soft-package lithium battery has abnormal internal resistance according to the internal resistance data, and if the laminated soft-package lithium battery does not have abnormal internal resistance, judging that the laminated soft-package lithium battery does not have the abnormal quality condition; if the internal resistance of the laminated soft package lithium battery is abnormal, judging whether the laminated soft package lithium battery has abnormal temperature according to the temperature data;
if the laminated soft package lithium battery has no temperature abnormality, determining that the laminated soft package lithium battery has a first abnormality; if the temperature of the laminated soft package lithium battery is abnormal, judging whether the temperature is abnormal due to over-low temperature, and if the temperature is abnormal due to over-low temperature, determining that the laminated soft package lithium battery has second abnormality; and if the temperature is abnormal due to overhigh temperature, determining that a third abnormality exists in the laminated soft package lithium battery.
It is understood that if there is a temperature abnormality and the temperature is not too low, it is determined that the temperature is too high.
In the above embodiment, because the internal resistance is an important parameter for measuring the power performance and evaluating the service life of the lithium battery, when the internal resistance is detected to be abnormal, it is first determined whether the internal resistance is increased due to the aging of the battery, which may be caused by the long service life of the laminated soft-package lithium battery, if the internal resistance is not abnormal; if the temperature is abnormal and the temperature is abnormal excessively, the internal resistance is increased probably due to the reduction of the lithium ion activity caused by low temperature, and the judgment of the abnormal condition is a second abnormality; if the temperature is too high, the chemical balance in the battery is damaged, the service life of the battery is shortened, and even dangerous accidents such as battery explosion and the like are caused, so that the battery can be judged to be a third abnormality; through the mode of multiple judgments, the detection accuracy is improved, and the management terminal can conveniently perform corresponding processing according to different abnormal conditions.
Referring to fig. 3, as a further embodiment of the detection method, after determining the temperature abnormality as the over-temperature abnormality,
and judging whether the internal air pressure of the laminated soft package lithium battery is abnormal or not according to the internal air pressure data, and if the internal air pressure of the laminated soft package lithium battery is abnormal, determining that the laminated soft package lithium battery has a fourth abnormality.
In the above embodiment, when the temperature rises, the electrolyte inside the lithium battery is vaporized or decomposed, so that a large amount of gas is generated, the pressure of the gas inside the lithium battery rises, and when the gas pressure reaches the bearing limit of the battery safety valve, the battery safety valve is opened, the gas inside the battery is discharged, and the battery fails; therefore, when the temperature is judged to be overhigh and abnormal, whether the internal air pressure is abnormal or not is judged according to the internal air pressure data, and if the internal air pressure is abnormal, the fourth abnormality of the laminated soft package lithium battery can be determined, so that the management terminal can conveniently perform corresponding processing.
Referring to fig. 4, as a further embodiment of the detection method, the battery data information further includes voltage data; also included after determining that there is an internal air pressure anomaly in the laminated soft-pack lithium battery,
and judging whether the laminated soft package lithium battery has voltage abnormity according to the voltage data, and if so, determining that the laminated soft package lithium battery has a fifth abnormity.
Wherein, voltage data accessible is gathered with the soft packet of voltage sensor that lithium cell is connected of lamination and is obtained.
In the above embodiment, when the laminated soft package lithium battery is charged and discharged, the temperature inside the battery is continuously raised, and the gas expansion generated in the activation process can increase the internal air pressure of the battery, so that if the internal air pressure of the laminated soft package lithium battery is abnormal, whether the internal air pressure is increased due to overcharge or overdischarge of the battery can be determined by determining whether the voltage is abnormal, thereby determining whether the fifth abnormality exists and taking corresponding charge and discharge control measures.
Referring to fig. 5, as an embodiment of judging whether the internal resistance abnormal condition exists in the laminated soft-package lithium battery according to the internal resistance data, specific steps include,
comparing the internal resistance data with a preset internal resistance reference value, and determining that the internal resistance of the laminated soft-package lithium battery is abnormal if the internal resistance data exceeds the preset internal resistance reference value; and if the internal resistance data does not exceed the preset internal resistance reference value, determining that the laminated soft-package lithium battery has no internal resistance abnormality.
The preset internal resistance reference value can be preset according to the actual parameters of the laminated soft-package lithium battery, and if the internal resistance data exceeds the preset internal resistance reference value, the internal resistance is judged to be too large, namely the internal resistance is abnormal.
In the above embodiment, since the discharge capacity of the battery is weakened due to excessively high internal resistance, so that the service time of the battery is shortened, when the internal resistance data exceeds the preset internal resistance reference value, it can be determined that the internal resistance is abnormal; when the internal resistance data does not exceed the internal resistance reference value, determining that no internal resistance abnormality exists; through detecting the internal resistance data of the laminated soft package lithium battery, the internal resistance abnormal condition is convenient to monitor.
Referring to fig. 6, the specific steps of determining whether there is a temperature abnormality in the laminated soft-pack lithium battery according to the temperature data include,
judging whether the temperature data is greater than a preset temperature maximum threshold or less than a preset temperature minimum threshold, if so, determining that the laminated soft package lithium battery has abnormal temperature, and if not, determining that the laminated soft package lithium battery does not have abnormal temperature; if the temperature data is greater than the preset temperature maximum threshold value, the temperature is abnormal due to overhigh temperature, and if the temperature data is less than the preset temperature minimum threshold value, the temperature is abnormal due to overlow temperature.
The preset temperature minimum threshold and the preset temperature maximum threshold can be preset according to actual conditions; in addition, it can be understood that if there is a temperature anomaly and the temperature data is not greater than the preset temperature maximum threshold, it can be determined that the temperature data is less than the preset temperature minimum threshold.
In the above embodiment, because the performance of the lithium battery is affected by the overhigh or overlow temperature, the service life of the battery is seriously or even possibly shortened, and therefore, if the temperature data of the laminated soft package lithium battery is greater than the preset highest temperature threshold value or less than the preset lowest temperature threshold value, the overhigh or overlow temperature abnormality can be judged, so that the abnormal condition of the temperature can be monitored conveniently.
Referring to fig. 7, as an embodiment of determining whether there is an abnormal internal air pressure in the laminated soft-pack lithium battery according to the internal air pressure data, specific steps include,
comparing the internal air pressure data with a preset air pressure reference value, and determining that the internal air pressure of the laminated soft package lithium battery is abnormal if the internal air pressure data exceeds the preset air pressure reference value; and if the internal air pressure data does not exceed the preset air pressure reference value, determining that the laminated soft package lithium battery has no internal air pressure abnormity.
The preset air pressure reference value can be preset according to the actual parameters of the laminated soft package lithium battery, and if the internal air pressure data exceed the preset air pressure reference value, the air pressure can be judged to be too large, namely the internal air pressure is abnormal.
In the above embodiment, since the internal air pressure of the lithium battery is too high, the performance of the battery is affected, and even the appearance of the battery is affected destructively by liquid leakage, bottom bulging and the like, if the internal air pressure of the lithium battery is too high and exceeds a preset air pressure reference value, it can be determined that the internal air pressure is abnormal, so that the abnormal condition of the internal air pressure can be monitored conveniently.
Referring to fig. 8, as an embodiment for determining whether a voltage abnormality exists in the laminated soft-pack lithium battery according to the voltage data, specific steps include,
judging whether the voltage data is greater than a preset voltage highest threshold or less than a preset voltage lowest threshold, and if so, determining that the laminated soft package lithium battery has voltage abnormity; and if not, determining that the laminated soft package lithium battery has no voltage abnormality.
The preset voltage maximum threshold and the preset voltage minimum threshold can be preset according to actual conditions.
In the above embodiment, if the voltage data is greater than the preset voltage maximum threshold, it is determined that the battery is overcharged; if the voltage data is smaller than the preset voltage lowest threshold value, the voltage over-discharge can be judged; and monitoring the voltage abnormal condition of the laminated soft package lithium battery by judging whether the voltage data is greater than the highest voltage threshold or less than the lowest preset voltage threshold.
As an implementation mode for generating corresponding warning information according to the quality abnormal condition of the laminated soft package lithium battery, the specific steps include,
if the quality abnormal condition is a first abnormal condition, generating first alarm information; or if the quality abnormal condition is a second abnormality, generating second alarm information; or if the quality abnormal condition is a third abnormal condition, generating third alarm information; or if the quality abnormal condition is a fourth abnormal condition, generating fourth alarm information; or, if the quality abnormal condition is a fifth abnormal condition, generating fifth alarm information.
In the embodiment, different warning information is generated according to different quality abnormal conditions to warn the management terminal, so that corresponding measures can be taken conveniently in time, and the pertinence, the real-time performance and the effectiveness of safety detection management on the laminated soft package lithium battery are improved.
As an implementation manner of the first warning information, since the internal resistance is an important factor that affects the power performance and the discharge efficiency of the lithium battery, as the storage time of the lithium ion battery increases, the internal resistance of the battery continuously ages, and when it is detected that the internal resistance is abnormal and is not caused by abnormal temperature, the internal resistance may be increased continuously, and when it is detected that the internal resistance is abnormal, the internal resistance may be caused by long service time of the laminated soft package lithium battery, the first warning information is used for warning the management terminal, and the battery is further detected or replaced in time.
As an implementation manner of the second warning information, when it is detected that the internal resistance abnormality and the temperature over-low abnormality exist at the same time, the internal resistance may be increased due to the reduction of the lithium ion activity caused by the low temperature, the management terminal is warned by using the second warning information, and the heating and temperature-raising operation is performed on the laminated soft-package lithium battery in time, so that the adverse effect on the lithium battery due to the over-low temperature is reduced.
As an implementation manner of the third warning message, when the temperature of the battery rises, the interface stability of the internal material of the battery is reduced, the side reaction of the electrolyte is increased, the cycle stability of the battery is reduced, the material of the battery is decomposed, the exothermic reaction of the battery is intensified, when the temperature is too high and reaches the heat-resistant limit of the diaphragm inside the battery, the diaphragm is melted, the internal short circuit of the battery is caused, and at the moment, the battery instantly emits a large amount of heat, and accidents such as ignition, combustion and even explosion are easy to happen; therefore, when the abnormal condition of the overhigh temperature is detected, the management terminal is alarmed by the third alarm information, and the laminated soft package lithium battery is cooled in time, so that the use safety of the lithium battery is improved.
As an implementation manner of the fourth warning information, when the temperature is too high, it may cause that the gas pressure inside the lithium battery is too high, which may result in battery failure, and therefore, when the internal gas pressure is detected to be abnormal, the fourth warning information is used to warn the management terminal, so as to take corresponding measures such as temperature reduction in time.
As an embodiment of the fifth warning information, when the lithium battery is overcharged, the battery voltage rapidly rises along with the increase of polarization, which may cause irreversible change of the structure of the positive active material and decomposition of the electrolyte, generate a large amount of gas, rapidly increase the internal gas pressure of the battery, and have hidden dangers such as explosion and combustion; when the lithium battery is overdischarged, the internal pressure is also increased, the reversibility of positive and negative active substances is damaged, the electrolyte is decomposed, and negative lithium is deposited, which may bring disastrous results to the battery; therefore, when the voltage of the laminated soft package lithium battery is detected to be abnormal, the management terminal is alarmed by the fifth alarm information, and then corresponding charging and discharging control measures are taken to improve the charging and discharging safety of the lithium battery.
The embodiment of the application also discloses a quality detection system for the laminated soft package lithium battery.
Referring to fig. 9, the detection system includes an acquisition module, an alarm module, and a control processor;
the collecting module is used for collecting battery data information of the laminated soft package lithium battery; the alarm module is used for sending alarm information to the management terminal to alarm; and the control processor is respectively connected with the acquisition module and the alarm module and is used for loading and executing the computer program of the laminated soft package lithium battery quality detection method.
As an embodiment of the acquisition module, the acquisition module comprises,
the internal resistance tester is used for acquiring internal resistance data of the laminated soft package lithium battery;
the temperature sensor is used for acquiring temperature data of the laminated soft package lithium battery;
the pressure sensor is used for acquiring internal air pressure data of the laminated soft package lithium battery;
and the voltage sensor is used for acquiring voltage data of the laminated soft package lithium battery.
The control processor may be a programmable logic controller or a digital controller, and the application is not particularly limited.
The system can execute the method provided by the embodiment of the invention, has the corresponding functional modules and beneficial effects of the execution method, and technical details which are not described in detail in the embodiment, and can refer to the method embodiment provided by the embodiment of the invention.
The foregoing is a preferred embodiment of the present application and is not intended to limit the scope of the application in any way, and any features disclosed in this specification (including the abstract and drawings) may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
Claims (10)
1. A quality detection method for a laminated soft package lithium battery is characterized by comprising the following steps: the detection method comprises the following steps of,
collecting battery data information of a laminated soft package lithium battery, and judging whether the laminated soft package lithium battery has a quality abnormal condition or not according to the battery data information;
if the laminated soft package lithium battery has the quality abnormal condition, generating corresponding warning information according to the quality abnormal condition of the laminated soft package lithium battery; and the alarm information is used for alarming the management terminal.
2. The method for detecting the quality of the laminated soft package lithium battery according to claim 1, characterized in that: the specific steps of collecting the battery data information of the laminated soft package lithium battery comprise,
the method comprises the steps of obtaining internal resistance data, temperature data and internal air pressure data of the laminated soft package lithium battery, and generating battery data information of the laminated soft package lithium battery according to the internal resistance data, the temperature data and the internal air pressure data.
3. The quality detection method for the laminated soft-package lithium battery according to claim 2, characterized in that: the specific steps of judging whether the laminated soft package lithium battery has the abnormal quality condition according to the battery data information comprise,
analyzing the battery data information to obtain internal resistance data, temperature data and internal air pressure data;
judging whether the laminated soft-package lithium battery has abnormal internal resistance according to the internal resistance data, and if the laminated soft-package lithium battery does not have abnormal internal resistance, judging that the laminated soft-package lithium battery does not have the abnormal quality condition; if the internal resistance of the laminated soft-package lithium battery is abnormal, judging whether the laminated soft-package lithium battery has abnormal temperature according to the temperature data;
if the laminated soft package lithium battery is not abnormal in temperature, determining that the laminated soft package lithium battery is abnormal firstly; if the temperature of the laminated soft package lithium battery is abnormal, judging whether the temperature is abnormal due to over-low temperature, and if the temperature is abnormal due to over-low temperature, determining that the laminated soft package lithium battery has second abnormality; and if the temperature is abnormal due to overhigh temperature, determining that a third abnormality exists in the laminated soft package lithium battery.
4. The method for detecting the quality of the laminated soft package lithium battery according to claim 3, characterized in that: further comprising after determining the temperature anomaly to be an over-temperature anomaly,
and judging whether the internal air pressure of the laminated soft package lithium battery is abnormal or not according to the internal air pressure data, and if so, determining that the laminated soft package lithium battery has a fourth abnormality.
5. The quality detection method for the laminated soft-package lithium battery according to claim 4, characterized in that: the battery data information further includes voltage data; further comprising after determining that there is an internal air pressure anomaly in the laminated lithium-ion battery,
and judging whether the laminated soft package lithium battery has voltage abnormity according to the voltage data, and if so, determining that the laminated soft package lithium battery has a fifth abnormity.
6. The quality detection method for the laminated soft-package lithium battery according to claim 5, characterized in that: the specific steps of judging whether the laminated soft-package lithium battery has the abnormal internal resistance condition according to the internal resistance data comprise,
comparing the internal resistance data with a preset internal resistance reference value, and if the internal resistance data exceeds the preset internal resistance reference value, determining that the internal resistance of the laminated soft-package lithium battery is abnormal; and if the internal resistance data does not exceed the preset internal resistance reference value, determining that the laminated soft-package lithium battery has no internal resistance abnormality.
7. The quality detection method for the laminated soft-package lithium battery according to claim 5, characterized in that: the specific steps of judging whether the laminated soft package lithium battery has abnormal temperature according to the temperature data comprise,
judging whether the temperature data is greater than a preset temperature highest threshold or less than a preset temperature lowest threshold, if so, determining that the laminated soft package lithium battery has temperature abnormity, and if not, determining that the laminated soft package lithium battery does not have temperature abnormity; if the temperature data is greater than a preset temperature maximum threshold value, the temperature is abnormal due to overhigh temperature, and if the temperature data is less than a preset temperature minimum threshold value, the temperature is abnormal due to overlow temperature.
8. The quality detection method for the laminated soft-package lithium battery according to claim 5, characterized in that: the specific steps of judging whether the laminated soft-package lithium battery has abnormal internal air pressure according to the internal air pressure data comprise,
comparing the internal air pressure data with a preset air pressure reference value, and if the internal air pressure data exceeds the preset air pressure reference value, determining that the internal air pressure of the laminated soft package lithium battery is abnormal; and if the internal air pressure data does not exceed the preset air pressure reference value, determining that the laminated soft package lithium battery has no internal air pressure abnormity.
9. The method for detecting the quality of the laminated soft-package lithium battery according to any one of claims 5 to 8, wherein the method comprises the following steps: the specific steps of generating corresponding warning information according to the quality abnormal condition of the laminated soft package lithium battery comprise,
if the quality abnormal condition is a first abnormality, generating first alarm information; or if the quality abnormal condition is a second abnormal condition, generating second alarm information; or if the quality abnormal condition is a third abnormal condition, generating third alarm information; or if the quality abnormal condition is a fourth abnormal condition, generating fourth alarm information; or, if the quality abnormal condition is a fifth abnormal condition, generating fifth alarm information.
10. The utility model provides a soft packet of lithium cell quality detection system of lamination which characterized in that: the detection system comprises an acquisition module, an alarm module and a control processor;
the acquisition module is used for acquiring battery data information of the laminated soft package lithium battery;
the alarm module is used for sending alarm information to the management terminal to alarm;
the control processor, which is connected to the acquisition module and the alarm module, respectively, is configured to load and execute a computer program according to any one of the methods of claims 1 to 9.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117346946A (en) * | 2023-11-29 | 2024-01-05 | 宁德时代新能源科技股份有限公司 | Air pressure sampling circuit, method, battery management system and power utilization device |
| CN117346946B (en) * | 2023-11-29 | 2024-05-03 | 宁德时代新能源科技股份有限公司 | Air pressure sampling circuit, method, battery management system and power utilization device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117346946A (en) * | 2023-11-29 | 2024-01-05 | 宁德时代新能源科技股份有限公司 | Air pressure sampling circuit, method, battery management system and power utilization device |
| CN117346946B (en) * | 2023-11-29 | 2024-05-03 | 宁德时代新能源科技股份有限公司 | Air pressure sampling circuit, method, battery management system and power utilization device |
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