CN117233637A - Lithium battery capacity jump monitoring method and device, computer equipment and storage medium - Google Patents
Lithium battery capacity jump monitoring method and device, computer equipment and storage medium Download PDFInfo
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 254
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 254
- 238000000034 method Methods 0.000 title claims abstract description 116
- 238000012544 monitoring process Methods 0.000 title claims abstract description 31
- 238000001514 detection method Methods 0.000 claims abstract description 38
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 30
- 238000012545 processing Methods 0.000 claims abstract description 27
- 230000008569 process Effects 0.000 claims description 88
- 238000004590 computer program Methods 0.000 claims description 14
- 238000007599 discharging Methods 0.000 claims description 11
- 238000012806 monitoring device Methods 0.000 claims description 3
- 238000012360 testing method Methods 0.000 abstract description 25
- 230000008859 change Effects 0.000 description 75
- 125000004122 cyclic group Chemical group 0.000 description 32
- 238000001556 precipitation Methods 0.000 description 7
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 5
- 229910001416 lithium ion Inorganic materials 0.000 description 5
- 238000004146 energy storage Methods 0.000 description 3
- 239000013543 active substance Substances 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000009189 diving Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035772 mutation Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
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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 application provides a lithium battery capacity water jump monitoring method, a device, computer equipment and a storage medium. The method comprises the steps of obtaining charge-discharge cycle state parameters of a lithium battery; carrying out homoenergetic difference processing on the charge-discharge cycle state parameter and the preset cycle state parameter to obtain a charge-discharge homoenergetic difference value; and sending a capacity loss adjusting signal to a battery capacity detection system according to the charge-discharge average energy difference value so as to adjust the capacity water jump state of the lithium battery. After the charge-discharge circulation state parameters are acquired, the charge-discharge operation state of the lithium battery is determined, then the charge-discharge circulation state parameters are compared with the standard charge-discharge parameters, the difference between the current charge-discharge circulation energy condition and the standard circulation energy is conveniently determined, finally, according to the difference value, the battery capacity detection system adjusts the capacity monitoring state of the lithium battery, so that the monitoring of the water-jump failure operation state of the lithium battery is conveniently carried out, and the capacity testing cost of the lithium battery is effectively reduced.
Description
Technical Field
The present application relates to the field of lithium batteries, and in particular, to a method and apparatus for monitoring capacity jump of a lithium battery, a computer device, and a storage medium.
Background
In recent years, along with the development of a dual-carbon target, the energy storage industry is developed at a high speed, and the lithium ion service life is focused by research and development personnel in the fields of electronics, automobiles and energy storage due to the characteristics of high energy density and long cycle life. However, due to the change of the usage scenario, the research on lithium ion batteries is also focused on the research of higher energy density and further longer cycle life. Along with the improvement of the cycle life of the lithium ion battery and the requirement of application fields such as power energy storage and the like on long-term operation reliability, the cycle performance of the lithium ion battery is an important consideration standard of the long-term operation reliability and is closely related to the safety performance of the battery.
The condition of capacity mutation easily appears in the charge-discharge process of traditional lithium cell, influences its life, and lithium cell life test takes a long time, generally takes several months or even more than a year, is unfavorable for in time improving battery design potential deficiency in time, and life test occupies test resources, is a lot of expense to the production manufacturing unit.
Disclosure of Invention
The application aims to overcome the defects in the prior art and provides a lithium battery capacity jump monitoring method, a device, computer equipment and a storage medium, which can effectively reduce the battery capacity test cost.
The aim of the application is realized by the following technical scheme:
a lithium battery capacity jump monitoring method, the method comprising:
acquiring charge-discharge cycle state parameters of a lithium battery;
carrying out homoenergetic difference processing on the charge-discharge cycle state parameter and a preset cycle state parameter to obtain a charge-discharge homoenergetic difference value;
and sending a capacity loss adjusting signal to a battery capacity detection system according to the charge-discharge average energy difference value so as to adjust the capacity water jump state of the lithium battery.
In one embodiment, the obtaining the charge-discharge cycle state parameter of the lithium battery includes: and obtaining the charging average voltage of the lithium battery.
In one embodiment, the performing the homoenergetic difference processing on the charge-discharge cycle state parameter and the preset cycle state parameter to obtain a charge-discharge homoenergetic difference value includes: and obtaining a difference value between the average charging voltage and a preset charging voltage equalizing value to obtain a charging average difference value.
In one embodiment, the sending a capacity loss adjustment signal to a battery capacity detection system according to the charge-discharge average energy difference value to adjust a capacity water jump state of the lithium battery includes: detecting whether the charging average difference value is matched with a preset charging difference value or not; and when the charging average difference value is not matched with the preset charging difference value, sending a charging capacity water jump alarm signal to the battery capacity detection system.
In one embodiment, the obtaining the charge-discharge cycle state parameter of the lithium battery includes: and obtaining the average discharge voltage of the lithium battery.
In one embodiment, the performing the homoenergetic difference processing on the charge-discharge cycle state parameter and the preset cycle state parameter to obtain a charge-discharge homoenergetic difference value includes: and obtaining a difference value between the average discharge voltage and preset discharge voltage equalizing to obtain a discharge energy equalizing difference value.
In one embodiment, the sending a capacity loss adjustment signal to a battery capacity detection system according to the charge-discharge average energy difference value to adjust a capacity water jump state of the lithium battery includes: detecting whether the energy release average difference value is matched with a preset discharge difference value or not; and when the energy release average difference value is matched with the preset discharge difference value, sending a discharge capacity normal signal to the battery capacity detection system.
A lithium battery capacity jump monitoring device, comprising: the device comprises a charge-discharge cycle acquisition module, a charge-discharge energy processing module and a capacity monitoring module; the charge-discharge cycle acquisition module is used for acquiring charge-discharge cycle state parameters of the lithium battery; the charge-discharge homoenergetic processing module is used for carrying out homoenergetic difference processing on the charge-discharge circulation state parameter and the preset circulation state parameter to obtain a charge-discharge homoenergetic difference value; and the capacity monitoring module is used for sending a capacity loss adjusting signal to the battery capacity detection system according to the charge-discharge average energy difference value so as to adjust the capacity water jump state of the lithium battery.
A computer device comprising a memory storing a computer program and a processor which when executing the computer program performs the steps of:
acquiring charge-discharge cycle state parameters of a lithium battery;
carrying out homoenergetic difference processing on the charge-discharge cycle state parameter and a preset cycle state parameter to obtain a charge-discharge homoenergetic difference value;
and sending a capacity loss adjusting signal to a battery capacity detection system according to the charge-discharge average energy difference value so as to adjust the capacity water jump state of the lithium battery.
A computer readable storage medium having stored thereon a computer program which when executed by a processor performs the steps of:
acquiring charge-discharge cycle state parameters of a lithium battery;
carrying out homoenergetic difference processing on the charge-discharge cycle state parameter and a preset cycle state parameter to obtain a charge-discharge homoenergetic difference value;
and sending a capacity loss adjusting signal to a battery capacity detection system according to the charge-discharge average energy difference value so as to adjust the capacity water jump state of the lithium battery.
Compared with the prior art, the application has at least the following advantages:
after the charge-discharge circulation state parameters are acquired, the charge-discharge operation state of the lithium battery is determined, then the charge-discharge circulation state parameters are compared with the standard charge-discharge parameters, the difference between the current charge-discharge circulation energy condition and the standard circulation energy is conveniently determined, finally, according to the difference value, the battery capacity detection system adjusts the capacity monitoring state of the lithium battery, the lithium battery is conveniently monitored in the water-jump failure operation state, the capacity change condition of the lithium battery can be predicted only by a small quantity of charge-discharge circulation periods, and the capacity testing cost of the lithium battery is effectively reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for monitoring lithium battery capacity jump in an embodiment;
FIG. 2 is a graph of charge-discharge cycle pressure change and half-rate in one embodiment;
FIG. 3 is a graph of half a charge-discharge cycle pressure variation in an embodiment;
fig. 4 is an internal structural view of a computer device in one embodiment.
Detailed Description
In order that the application may be readily understood, a more complete description of the application will be rendered by reference to the appended drawings. The drawings illustrate preferred embodiments of the application. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
The application relates to a lithium battery capacity water jump monitoring method. In one embodiment, the method for monitoring the capacity jump of the lithium battery comprises the steps of obtaining a charge-discharge cycle state parameter of the lithium battery; carrying out homoenergetic difference processing on the charge-discharge cycle state parameter and a preset cycle state parameter to obtain a charge-discharge homoenergetic difference value; and sending a capacity loss adjusting signal to a battery capacity detection system according to the charge-discharge average energy difference value so as to adjust the capacity water jump state of the lithium battery. After the charge-discharge circulation state parameters are acquired, the charge-discharge operation state of the lithium battery is determined, then the charge-discharge circulation state parameters are compared with the standard charge-discharge parameters, the difference between the current charge-discharge circulation energy condition and the standard circulation energy is conveniently determined, finally, according to the difference value, the battery capacity detection system adjusts the capacity monitoring state of the lithium battery, the lithium battery is conveniently monitored in the water-jump failure operation state, the capacity change condition of the lithium battery can be predicted only by a small quantity of charge-discharge circulation periods, and the capacity testing cost of the lithium battery is effectively reduced.
Fig. 1 is a flowchart of a method for monitoring capacity jump of a lithium battery according to an embodiment of the application. The lithium battery capacity water jump monitoring method comprises the following steps of part or all.
S100: and acquiring the charge-discharge cycle state parameters of the lithium battery.
In this embodiment, the charge-discharge cycle state parameter is a charge-discharge operation state parameter of the lithium battery, that is, the charge-discharge cycle state parameter is a working parameter of the lithium battery during a charge-discharge cycle, that is, the charge-discharge cycle state parameter corresponds to an electrical performance operation state of the lithium battery during a charge-discharge cycle. By acquiring the charge-discharge cycle state parameters, the change condition of the electric energy of the lithium battery in the charge-discharge cycle process is conveniently determined, and therefore the electric energy efficiency of the lithium battery increased or released in the charge-discharge cycle process is conveniently determined.
S200: and carrying out homoenergetic difference processing on the charge-discharge cycle state parameter and the preset cycle state parameter to obtain a charge-discharge homoenergetic difference value.
In this embodiment, the charge-discharge cycle state parameter is a charge-discharge operation state parameter of the lithium battery, that is, the charge-discharge cycle state parameter is a working parameter of the lithium battery during a charge-discharge cycle, that is, the charge-discharge cycle state parameter corresponds to an electrical performance operation state of the lithium battery during a charge-discharge cycle. By acquiring the charge-discharge cycle state parameters, the change condition of the electric energy of the lithium battery in the charge-discharge cycle process is conveniently determined, and therefore the electric energy efficiency of the lithium battery increased or released in the charge-discharge cycle process is conveniently determined. The preset circulation state parameter is a charge-discharge standard operation state parameter of the lithium battery, namely the preset circulation state parameter is a reference working parameter in the charge-discharge circulation process of the lithium battery, namely the preset circulation state parameter corresponds to an appointed electric performance operation state of the lithium battery in the charge-discharge circulation process. The energy difference processing of the charge-discharge cycle state parameter and the preset cycle state parameter is convenient for determining the electric energy change difference of the lithium battery in the charge-discharge cycle process, so that the difference condition between the energy change and the standard energy change of the lithium battery in the charge-discharge cycle process is convenient to determine.
S300: and sending a capacity loss adjusting signal to a battery capacity detection system according to the charge-discharge average energy difference value so as to adjust the capacity water jump state of the lithium battery.
In this embodiment, the charge-discharge average energy difference value is obtained based on the charge-discharge cycle state parameter and the preset cycle state parameter, where the charge-discharge cycle state parameter is a charge-discharge operation state parameter of the lithium battery, that is, the charge-discharge cycle state parameter is a working parameter of the lithium battery during a charge-discharge cycle, that is, the charge-discharge cycle state parameter corresponds to an electrical performance operation state of the lithium battery during a charge-discharge cycle. By acquiring the charge-discharge cycle state parameters, the change condition of the electric energy of the lithium battery in the charge-discharge cycle process is conveniently determined, and therefore the electric energy efficiency of the lithium battery increased or released in the charge-discharge cycle process is conveniently determined. The preset circulation state parameter is a charge-discharge standard operation state parameter of the lithium battery, namely the preset circulation state parameter is a reference working parameter in the charge-discharge circulation process of the lithium battery, namely the preset circulation state parameter corresponds to an appointed electric performance operation state of the lithium battery in the charge-discharge circulation process. The energy difference processing of the charge-discharge cycle state parameter and the preset cycle state parameter is convenient for determining the electric energy change difference of the lithium battery in the charge-discharge cycle process, so that the difference condition between the energy change and the standard energy change of the lithium battery in the charge-discharge cycle process is convenient to determine. After the charge-discharge average energy difference value is obtained, the current capacity change speed of the lithium battery can be determined, so that the energy change difference degree of the current charge-discharge of the lithium battery is determined, and the capacity state of the lithium battery can be adjusted according to the energy change difference condition of the charge-discharge, so that the failure condition caused by capacity water jump of the lithium battery can be determined in time.
In the above embodiment, after the charge-discharge cycle state parameters are collected, the charge-discharge operation state of the lithium battery is determined, then the charge-discharge cycle state parameters are compared with the standard charge-discharge parameters, so that the difference between the current charge-discharge cycle energy condition and the standard cycle energy is conveniently determined, finally, according to the difference value, the battery capacity detection system adjusts the capacity monitoring state of the lithium battery, so that the jump failure operation state of the lithium battery is conveniently monitored, the capacity change condition of the lithium battery can be predicted only by a small amount of charge-discharge cycle period, and the capacity testing cost of the lithium battery is effectively reduced.
In one embodiment, the obtaining the charge-discharge cycle state parameter of the lithium battery includes: and obtaining the charging average voltage of the lithium battery. In this embodiment, the charge-discharge cycle state parameter is a charge-discharge operation state parameter of the lithium battery, that is, the charge-discharge cycle state parameter is a working parameter of the lithium battery during a charge-discharge cycle, that is, the charge-discharge cycle state parameter corresponds to an electrical performance operation state of the lithium battery during a charge-discharge cycle. By acquiring the charge-discharge cycle state parameters, the change condition of the electric energy of the lithium battery in the charge-discharge cycle process is conveniently determined, and therefore the electric energy efficiency of the lithium battery increased or released in the charge-discharge cycle process is conveniently determined. The charge-discharge cycle state parameter includes a charge average voltage of the lithium battery, where the charge average voltage is a change condition of total charge energy in a cycle test process of the lithium battery, that is, the charge average voltage is a change amount of the average voltage in the charge process, and specifically, the charge average voltage is a ratio between total charge energy and total charge capacity in a single charge process of the lithium battery.
Further, the performing the homoenergetic difference processing on the charge-discharge cycle state parameter and the preset cycle state parameter to obtain a charge-discharge homoenergetic difference value includes: and obtaining a difference value between the average charging voltage and a preset charging voltage equalizing value to obtain a charging average difference value. In this embodiment, the charge-discharge cycle state parameter is a charge-discharge operation state parameter of the lithium battery, that is, the charge-discharge cycle state parameter is a working parameter of the lithium battery during a charge-discharge cycle, that is, the charge-discharge cycle state parameter corresponds to an electrical performance operation state of the lithium battery during a charge-discharge cycle. By acquiring the charge-discharge cycle state parameters, the change condition of the electric energy of the lithium battery in the charge-discharge cycle process is conveniently determined, and therefore the electric energy efficiency of the lithium battery increased or released in the charge-discharge cycle process is conveniently determined. The preset circulation state parameter is a charge-discharge standard operation state parameter of the lithium battery, namely the preset circulation state parameter is a reference working parameter in the charge-discharge circulation process of the lithium battery, namely the preset circulation state parameter corresponds to an appointed electric performance operation state of the lithium battery in the charge-discharge circulation process. The energy difference processing of the charge-discharge cycle state parameter and the preset cycle state parameter is convenient for determining the electric energy change difference of the lithium battery in the charge-discharge cycle process, so that the difference condition between the energy change and the standard energy change of the lithium battery in the charge-discharge cycle process is convenient to determine. The charge-discharge cycle state parameter includes a charge average voltage of the lithium battery, where the charge average voltage is a change condition of total charge energy in a cycle test process of the lithium battery, that is, the charge average voltage is a change amount of the average voltage in the charge process, and specifically, the charge average voltage is a ratio between total charge energy and total charge capacity in a single charge process of the lithium battery. The preset charging voltage equalizing value is the standard variation of the total energy of charging in the cyclic test process of the lithium battery, and the variation degree of the average voltage in the charging process of the lithium battery is conveniently determined by calculating the difference value of the charging average voltage and the preset charging voltage equalizing value, so that the variation speed of the average voltage in the charging process of the lithium battery is conveniently determined.
Further, the sending a capacity loss adjustment signal to a battery capacity detection system according to the charge-discharge average energy difference value to adjust the capacity water jump state of the lithium battery includes: detecting whether the charging average difference value is matched with a preset charging difference value or not; and when the charging average difference value is not matched with the preset charging difference value, sending a charging capacity water jump alarm signal to the battery capacity detection system. In this embodiment, the charge-discharge average energy difference value is obtained based on the charge-discharge cycle state parameter and the preset cycle state parameter, where the charge-discharge cycle state parameter is a charge-discharge operation state parameter of the lithium battery, that is, the charge-discharge cycle state parameter is a working parameter of the lithium battery during a charge-discharge cycle, that is, the charge-discharge cycle state parameter corresponds to an electrical performance operation state of the lithium battery during a charge-discharge cycle. By acquiring the charge-discharge cycle state parameters, the change condition of the electric energy of the lithium battery in the charge-discharge cycle process is conveniently determined, and therefore the electric energy efficiency of the lithium battery increased or released in the charge-discharge cycle process is conveniently determined. The preset circulation state parameter is a charge-discharge standard operation state parameter of the lithium battery, namely the preset circulation state parameter is a reference working parameter in the charge-discharge circulation process of the lithium battery, namely the preset circulation state parameter corresponds to an appointed electric performance operation state of the lithium battery in the charge-discharge circulation process. The energy difference processing of the charge-discharge cycle state parameter and the preset cycle state parameter is convenient for determining the electric energy change difference of the lithium battery in the charge-discharge cycle process, so that the difference condition between the energy change and the standard energy change of the lithium battery in the charge-discharge cycle process is convenient to determine. After the charge-discharge average energy difference value is obtained, the current capacity change speed of the lithium battery can be determined, so that the energy change difference degree of the current charge-discharge of the lithium battery is determined, and the capacity state of the lithium battery can be adjusted according to the energy change difference condition of the charge-discharge, so that the failure condition caused by capacity water jump of the lithium battery can be determined in time. The charge-discharge cycle state parameter includes a charge average voltage of the lithium battery, where the charge average voltage is a change condition of total charge energy in a cycle test process of the lithium battery, that is, the charge average voltage is a change amount of the average voltage in the charge process, and specifically, the charge average voltage is a ratio between total charge energy and total charge capacity in a single charge process of the lithium battery. The preset charging voltage equalizing value is the standard variation of the total energy of charging in the cyclic test process of the lithium battery, and the variation degree of the average voltage in the charging process of the lithium battery is conveniently determined by calculating the difference value of the charging average voltage and the preset charging voltage equalizing value, so that the variation speed of the average voltage in the charging process of the lithium battery is conveniently determined. The charge average difference value is not matched with the preset charge difference value, so that the fact that the average voltage change is too fast in the charging process of the lithium battery is indicated, namely that the total charge energy increase amount of the lithium battery in the charge overload in a single test cycle period is too large is indicated, namely that the total charge energy change rate of the lithium battery in the charge overload in the single test cycle period is too fast, at the moment, a charge capacity water-jump alarm signal is sent to the battery capacity detection system, and the failure condition of capacity water-jump of the lithium battery is timely determined.
In another embodiment, when the charging average difference value matches the preset charging difference value, a charging capacity normal signal is sent to the battery capacity detection system.
In one embodiment, the obtaining the charge-discharge cycle state parameter of the lithium battery includes: and obtaining the average discharge voltage of the lithium battery. In this embodiment, the charge-discharge cycle state parameter is a charge-discharge operation state parameter of the lithium battery, that is, the charge-discharge cycle state parameter is a working parameter of the lithium battery during a charge-discharge cycle, that is, the charge-discharge cycle state parameter corresponds to an electrical performance operation state of the lithium battery during a charge-discharge cycle. By acquiring the charge-discharge cycle state parameters, the change condition of the electric energy of the lithium battery in the charge-discharge cycle process is conveniently determined, and therefore the electric energy efficiency of the lithium battery increased or released in the charge-discharge cycle process is conveniently determined. The charge-discharge cycle state parameter includes a discharge average voltage of the lithium battery, where the discharge average voltage is a change condition of total discharge energy in a cycle test process of the lithium battery, that is, the discharge average voltage is a change amount of the average voltage in the discharge process, and specifically, the discharge average voltage is a ratio between total discharge energy and total discharge capacity in a single discharge process of the lithium battery.
Further, the performing the homoenergetic difference processing on the charge-discharge cycle state parameter and the preset cycle state parameter to obtain a charge-discharge homoenergetic difference value includes: and obtaining a difference value between the average discharge voltage and preset discharge voltage equalizing to obtain a discharge energy equalizing difference value. In this embodiment, the charge-discharge cycle state parameter is a charge-discharge operation state parameter of the lithium battery, that is, the charge-discharge cycle state parameter is a working parameter of the lithium battery during a charge-discharge cycle, that is, the charge-discharge cycle state parameter corresponds to an electrical performance operation state of the lithium battery during a charge-discharge cycle. By acquiring the charge-discharge cycle state parameters, the change condition of the electric energy of the lithium battery in the charge-discharge cycle process is conveniently determined, and therefore the electric energy efficiency of the lithium battery increased or released in the charge-discharge cycle process is conveniently determined. The preset circulation state parameter is a charge-discharge standard operation state parameter of the lithium battery, namely the preset circulation state parameter is a reference working parameter in the charge-discharge circulation process of the lithium battery, namely the preset circulation state parameter corresponds to an appointed electric performance operation state of the lithium battery in the charge-discharge circulation process. The energy difference processing of the charge-discharge cycle state parameter and the preset cycle state parameter is convenient for determining the electric energy change difference of the lithium battery in the charge-discharge cycle process, so that the difference condition between the energy change and the standard energy change of the lithium battery in the charge-discharge cycle process is convenient to determine. The charge-discharge cycle state parameter includes a discharge average voltage of the lithium battery, where the discharge average voltage is a change condition of total discharge energy in a cycle test process of the lithium battery, that is, the discharge average voltage is a change amount of the average voltage in the discharge process, and specifically, the discharge average voltage is a ratio between total discharge energy and total discharge capacity in a single discharge process of the lithium battery. The preset discharge voltage equalizing value is the standard variation of the total discharge energy in the cyclic test process of the lithium battery, and the variation difference degree of the average discharge voltage in the discharge process of the lithium battery is conveniently determined by solving the difference value of the average discharge voltage and the preset discharge voltage equalizing value, so that the variation speed of the average discharge voltage in the discharge process of the lithium battery is conveniently determined.
Further, the sending a capacity loss adjustment signal to a battery capacity detection system according to the charge-discharge average energy difference value to adjust the capacity water jump state of the lithium battery includes: detecting whether the energy release average difference value is matched with a preset discharge difference value or not; and when the energy release average difference value is matched with the preset discharge difference value, sending a discharge capacity normal signal to the battery capacity detection system. In this embodiment, the charge-discharge average energy difference value is obtained based on the charge-discharge cycle state parameter and the preset cycle state parameter, where the charge-discharge cycle state parameter is a charge-discharge operation state parameter of the lithium battery, that is, the charge-discharge cycle state parameter is a working parameter of the lithium battery during a charge-discharge cycle, that is, the charge-discharge cycle state parameter corresponds to an electrical performance operation state of the lithium battery during a charge-discharge cycle. By acquiring the charge-discharge cycle state parameters, the change condition of the electric energy of the lithium battery in the charge-discharge cycle process is conveniently determined, and therefore the electric energy efficiency of the lithium battery increased or released in the charge-discharge cycle process is conveniently determined. The preset circulation state parameter is a charge-discharge standard operation state parameter of the lithium battery, namely the preset circulation state parameter is a reference working parameter in the charge-discharge circulation process of the lithium battery, namely the preset circulation state parameter corresponds to an appointed electric performance operation state of the lithium battery in the charge-discharge circulation process. The energy difference processing of the charge-discharge cycle state parameter and the preset cycle state parameter is convenient for determining the electric energy change difference of the lithium battery in the charge-discharge cycle process, so that the difference condition between the energy change and the standard energy change of the lithium battery in the charge-discharge cycle process is convenient to determine. After the charge-discharge average energy difference value is obtained, the current capacity change speed of the lithium battery can be determined, so that the energy change difference degree of the current charge-discharge of the lithium battery is determined, and the capacity state of the lithium battery can be adjusted according to the energy change difference condition of the charge-discharge, so that the failure condition caused by capacity water jump of the lithium battery can be determined in time. The charge-discharge cycle state parameter includes a discharge average voltage of the lithium battery, where the discharge average voltage is a change condition of total discharge energy in a cycle test process of the lithium battery, that is, the discharge average voltage is a change amount of the average voltage in the discharge process, and specifically, the discharge average voltage is a ratio between total discharge energy and total discharge capacity in a single discharge process of the lithium battery. The preset discharge voltage equalizing value is the standard variation of the total discharge energy in the cyclic test process of the lithium battery, and the variation difference degree of the average discharge voltage in the discharge process of the lithium battery is conveniently determined by solving the difference value of the average discharge voltage and the preset discharge voltage equalizing value, so that the variation speed of the average discharge voltage in the discharge process of the lithium battery is conveniently determined. The energy release average difference value is matched with the preset discharge difference value, so that the average voltage change in the discharging process of the lithium battery is normal, namely that the total discharge energy increment of the lithium battery in the discharge overload in a single test cycle period is in a standard range, namely that the total discharge energy change rate of the lithium battery in the discharge overload in the single test cycle period is a specified change rate, and at the moment, a discharge capacity normal signal is sent to the battery capacity detection system to determine that the lithium battery is in a discharge normal state.
In another embodiment, when the energy release average difference value is matched with the preset discharge difference value, a discharge capacity water jump alarm signal is sent to the battery capacity detection system, and the failure condition of capacity water jump of the lithium battery is timely determined.
In the actual charge-discharge cycle test process of the lithium battery, the charge-discharge voltage on the lithium battery is collected through the cycle charge-discharge test of the lithium battery, so that the capacity change condition of the lithium battery can be conveniently determined through the change condition of the charge-discharge voltage, the failure problem of the lithium battery can be conveniently determined, and the cycle life of the lithium battery can be conveniently determined.
However, there are various situations that cause capacity jump of the lithium battery, in which an increase in internal resistance of the lithium battery causes capacity jump, in order to determine a cause of capacity jump of the lithium battery, the method further includes, according to the charge-discharge homoenergetic difference value, sending a capacity loss adjustment signal to a battery capacity detection system to adjust a capacity jump state of the lithium battery, and then further includes the following steps:
acquiring the charge-discharge cyclic voltage variation half quantity of the lithium battery;
detecting whether the charge-discharge cycle pressure variation half quantity is larger than a preset pressure variation half quantity or not;
when the charge-discharge cyclic voltage variation half quantity is larger than the preset voltage variation half quantity, obtaining the charge-discharge cyclic voltage variation and half quantity of the lithium battery;
detecting whether the charge-discharge cyclic pressure change and half quantity are smaller than or equal to preset pressure change and half quantity;
and when the charge-discharge cyclic voltage variation and half quantity are smaller than or equal to the preset voltage variation and half quantity, sending an internal water jump increasing signal to the battery capacity detection system.
In this embodiment, the charge-discharge cyclic voltage variation half amount is a variation amount of a difference between charge and discharge voltages of the lithium battery in a single or limited number of charge-discharge cyclic periods, the charge-discharge cyclic voltage variation sum half amount is a variation amount of a sum of charge and discharge voltages of the lithium battery in a single or limited number of charge-discharge cyclic periods, and specifically, the charge-discharge cyclic voltage variation half amount is a half of a difference between charge average voltages and discharge average voltages of the lithium battery, and the charge-discharge cyclic voltage variation sum half amount is a half of a sum of charge average voltages and discharge average voltages of the lithium battery. And determining the capacity water jump cause of the lithium battery through the average voltage change difference conditions reflected by the charge average voltage and the discharge average voltage. The charge-discharge cycle voltage variation half amount is larger than the preset voltage variation half amount, which indicates that the average voltage in the charging process of the lithium battery is increased and the average voltage in the discharging process is reduced. And then comparing the charge-discharge cyclic voltage variation and half quantity with the preset voltage variation and half quantity, wherein the charge-discharge cyclic voltage variation and half quantity are smaller than or equal to the preset voltage variation and half quantity, which shows that the total charge energy in the charge process of the lithium battery is equivalent to the total discharge energy in the discharge process, namely, the increase of the charge average voltage of the lithium battery is almost equal to the decrease of the discharge average voltage, namely, the capacity jump of the lithium battery is related to the increase of the internal resistance, and at the moment, an internal increase jump signal is sent to the battery capacity detection system, so that the capacity jump of the lithium battery is determined because of the increase of the internal resistance, the cause type of failure of the lithium battery is conveniently determined, and the failure detection accuracy of the lithium battery is effectively improved.
Further, the detecting whether the charge-discharge cyclic pressure variation half amount is greater than a preset pressure variation half amount further includes:
when the half quantity of the charge-discharge cyclic pressure variation is smaller than or equal to the half quantity of the preset pressure variation, detecting whether the charge-discharge cyclic pressure variation and half quantity are larger than the preset pressure variation and half quantity or not;
and when the charge-discharge cyclic voltage change and half quantity are larger than the preset voltage change and half quantity, sending a lithium precipitation water jump signal to the battery capacity detection system.
In an embodiment, the charge-discharge cycle voltage variation half amount is less than or equal to the preset voltage variation half amount, indicating that the average voltage during charging of the lithium battery increases, and the average voltage during discharging also increases. And then comparing the charge-discharge cyclic voltage change and half quantity with the preset voltage change and half quantity, wherein the charge-discharge cyclic voltage change and half quantity is larger than the preset voltage change and half quantity, which shows that the average voltage increase in the charging process of the lithium battery is equivalent to the average voltage increase in discharging, specifically, the charge-discharge cyclic voltage change and half quantity SV are suddenly increased at the moment, the detail is shown in figure 2, and the charge-discharge cyclic voltage variation half quantity RV is not obviously changed, and the detail is shown in figure 3. In this way, the change direction and the change speed of the average voltage in the charging process and the discharging process of the lithium battery are determined, at this time, the capacity change condition of the lithium battery corresponds to the lithium precipitation condition occurring in the lithium battery, and a lithium precipitation jump signal is sent to the battery capacity detection system, so that the capacity jump cause of the lithium battery is determined to be lithium precipitation, and the lithium precipitation is conveniently distinguished from the capacity jump condition caused by the increase of the internal resistance.
The lithium generation of the lithium battery is that the consumption of active substances in the charging and discharging process also causes the change of the average voltage of the charging and discharging of the battery, the capacity of the lithium ion battery is mainly limited by the capacity of the positive electrode, if the active substances are consumed due to factors such as side reaction and the like in the circulating process, the potential of the negative electrode at the end of discharging can be rapidly increased, the positive electrode reaches the discharge cut-off voltage of the battery under higher potential, and the average voltage in the charging and discharging process can be increased, so that the charge and discharge circulating voltage is changed and half of the charge and discharge circulating voltage is increased suddenly, and the half of the charge and discharge circulating voltage is basically unchanged.
In another embodiment, when the half charge-discharge cyclic voltage variation is greater than the preset voltage variation half quantity and the sum of the charge-discharge cyclic voltage variation and the half charge is greater than the preset voltage variation and the half charge, a bipolar water jump signal is sent to the battery capacity detection system, which indicates that the lithium battery has the conditions of increased internal resistance and lithium precipitation at the same time.
In another embodiment, when the half charge-discharge cyclic voltage variation is less than or equal to the preset voltage variation half quantity, and the sum of the charge-discharge cyclic voltage variation and the half charge is less than or equal to the preset voltage variation and the half charge, a cyclic capacity non-jump signal is sent to the battery capacity detection system, which indicates that the lithium battery has no internal resistance increase and no lithium precipitation at the moment.
The above-mentioned various preset variables are all set up in the database, are convenient for in time draw, and different preset variables are put in different memory cell, namely in different memory stacks, and fill and put cyclic voltage variation half and fill and put cyclic voltage variation and half can be obtained through corresponding treater, for example, through filling and putting the differentiator and the integrator collection in homoenergetic processing module.
In one embodiment, the application also provides a lithium battery capacity diving monitoring device, which comprises a charge-discharge cycle acquisition module, a charge-discharge energy processing module and a capacity monitoring module; the charge-discharge cycle acquisition module is used for acquiring charge-discharge cycle state parameters of the lithium battery; the charge-discharge homoenergetic processing module is used for carrying out homoenergetic difference processing on the charge-discharge circulation state parameter and the preset circulation state parameter to obtain a charge-discharge homoenergetic difference value; and the capacity monitoring module is used for sending a capacity loss adjusting signal to the battery capacity detection system according to the charge-discharge average energy difference value so as to adjust the capacity water jump state of the lithium battery.
In this embodiment, after the charge-discharge cycle acquisition module acquires the charge-discharge cycle state parameters, the charge-discharge operation state of the lithium battery is determined, then the charge-discharge homoenergetic processing module compares the charge-discharge cycle state parameters with the standard charge-discharge parameters, so as to determine the difference between the current charge-discharge cycle energy condition and the standard cycle energy, and finally the capacity monitoring module adjusts the capacity monitoring state of the lithium battery according to the difference value, so as to monitor the jump failure operation state of the lithium battery, and the capacity change condition of the lithium battery can be predicted only by a small amount of charge-discharge cycle periods, thereby effectively reducing the capacity testing cost of the lithium battery.
In one embodiment, a computer device is provided, which may be a server, the internal structure of which may be as shown in fig. 4. The computer device includes a processor, a memory, and a network interface connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, computer programs, and a database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The database of the computer equipment is used for storing data such as charge and discharge cycle state parameters, preset cycle state parameters, capacity loss signals and the like. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program when executed by a processor implements a lithium battery capacity jump monitoring method.
It will be appreciated by persons skilled in the art that the architecture shown in fig. 4 is merely a block diagram of some of the architecture relevant to the present inventive arrangements and is not limiting as to the computer device to which the present inventive arrangements are applicable, and that a particular computer device may include more or fewer components than shown, or may combine some of the components, or have a different arrangement of components.
In one embodiment, the present application further provides a computer device, including a memory and a processor, where the memory stores a computer program, and the processor executes the computer program to implement the steps in the method embodiments described above.
In one embodiment, the present application further provides a computer readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the method embodiments described above.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, or the like. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory. By way of illustration, and not limitation, RAM can be in the form of a variety of forms, such as static random access memory (Static Random Access Memory, SRAM) or dynamic random access memory (Dynamic Random Access Memory, DRAM), and the like.
The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.
Claims (10)
1. The lithium battery capacity water jump monitoring method is characterized by comprising the following steps of:
acquiring charge-discharge cycle state parameters of a lithium battery;
carrying out homoenergetic difference processing on the charge-discharge cycle state parameter and a preset cycle state parameter to obtain a charge-discharge homoenergetic difference value;
and sending a capacity loss adjusting signal to a battery capacity detection system according to the charge-discharge average energy difference value so as to adjust the capacity water jump state of the lithium battery.
2. The method for monitoring the capacity jump of a lithium battery according to claim 1, wherein the step of obtaining the charge-discharge cycle state parameters of the lithium battery comprises the steps of:
and obtaining the charging average voltage of the lithium battery.
3. The method for monitoring the capacity jump of a lithium battery according to claim 2, wherein the step of performing a homoenergetic difference process on the charge-discharge cycle state parameter and a preset cycle state parameter to obtain a charge-discharge homoenergetic difference value comprises the steps of:
and obtaining a difference value between the average charging voltage and a preset charging voltage equalizing value to obtain a charging average difference value.
4. The method for monitoring the capacity jump of a lithium battery according to claim 3, wherein the step of sending a capacity loss adjustment signal to a battery capacity detection system according to the charge-discharge difference value to adjust the capacity jump state of the lithium battery comprises the steps of:
detecting whether the charging average difference value is matched with a preset charging difference value or not;
and when the charging average difference value is not matched with the preset charging difference value, sending a charging capacity water jump alarm signal to the battery capacity detection system.
5. The method for monitoring the capacity jump of a lithium battery according to claim 1, wherein the step of obtaining the charge-discharge cycle state parameters of the lithium battery comprises the steps of:
and obtaining the average discharge voltage of the lithium battery.
6. The method for monitoring the capacity jump of a lithium battery according to claim 5, wherein the step of performing a homoenergetic difference process on the charge-discharge cycle state parameter and a preset cycle state parameter to obtain a charge-discharge homoenergetic difference value comprises:
and obtaining a difference value between the average discharge voltage and preset discharge voltage equalizing to obtain a discharge energy equalizing difference value.
7. The method for monitoring the capacity jump of a lithium battery according to claim 6, wherein the step of sending a capacity loss adjustment signal to a battery capacity detection system according to the charge-discharge difference value to adjust the capacity jump state of the lithium battery comprises:
detecting whether the energy release average difference value is matched with a preset discharge difference value or not;
and when the energy release average difference value is matched with the preset discharge difference value, sending a discharge capacity normal signal to the battery capacity detection system.
8. A lithium battery capacity jump monitoring device, comprising:
the charging and discharging cycle acquisition module is used for acquiring charging and discharging cycle state parameters of the lithium battery;
the charge-discharge homoenergetic processing module is used for carrying out homoenergetic difference processing on the charge-discharge circulation state parameter and the preset circulation state parameter to obtain a charge-discharge homoenergetic difference value;
and the capacity monitoring module is used for sending a capacity loss adjusting signal to the battery capacity detection system according to the charge-discharge homoenergetic difference value so as to adjust the capacity water jump state of the lithium battery.
9. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any of claims 1 to 7 when the computer program is executed.
10. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method according to any one of claims 1 to 7.
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