CN116482551A - Calibration method, measurement method, system, equipment and medium for short circuit in module - Google Patents
Calibration method, measurement method, system, equipment and medium for short circuit in module Download PDFInfo
- Publication number
- CN116482551A CN116482551A CN202310465876.2A CN202310465876A CN116482551A CN 116482551 A CN116482551 A CN 116482551A CN 202310465876 A CN202310465876 A CN 202310465876A CN 116482551 A CN116482551 A CN 116482551A
- Authority
- CN
- China
- Prior art keywords
- battery module
- battery
- standard
- calibration
- voltage value
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 87
- 238000000691 measurement method Methods 0.000 title claims abstract description 15
- 230000008859 change Effects 0.000 claims abstract description 43
- 230000008569 process Effects 0.000 claims abstract description 43
- 238000007599 discharging Methods 0.000 claims description 18
- 238000010586 diagram Methods 0.000 claims description 12
- 238000004590 computer program Methods 0.000 claims description 10
- 238000004088 simulation Methods 0.000 claims description 9
- 238000005259 measurement Methods 0.000 claims description 6
- 239000006185 dispersion Substances 0.000 claims description 3
- 238000001514 detection method Methods 0.000 abstract description 15
- 230000007774 longterm Effects 0.000 abstract description 6
- 238000004880 explosion Methods 0.000 description 5
- 238000002485 combustion reaction Methods 0.000 description 4
- 230000006870 function Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910010707 LiFePO 4 Inorganic materials 0.000 description 1
- 238000003491 array Methods 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005562 fading Methods 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a calibration method, a measurement method, a system, equipment and a medium for short circuit in a module, wherein the calibration method comprises the following steps: setting a preset simulated short-circuit current in a battery module, and acquiring a voltage value of the battery module in a charge-discharge cycle process; and determining a calibration standard of the battery module according to the corresponding relation between the change rate of the voltage value and the simulated short-circuit current. According to the calibration method, the simulated short-circuit current is arranged in the battery module to simulate the internal short circuit of the battery cell, charge and discharge circulation is carried out, and the median value of the standard components of the voltage of the battery cell in the module in the charge and discharge process and the variation trend of the median value along with the increase of the circulation times are calculated; the change trend and the slope are obtained by changing the severity of the short circuit in the analog battery cell through changing the analog short circuit current, and the change trend and the slope are used as calibration standards, so that the detection speed is high, long-term standing of the battery is not needed, and the battery cell is not needed to be disassembled for detection; in addition, the calibrated result can be used on the same type of battery cell, and the expansibility is strong.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a calibration method, a measurement method, a system, equipment and a medium for short circuit in a module.
Background
At present, a large number of batteries are used in an energy storage power station and a new energy automobile, and in the manufacturing process of the batteries, due to the fact that dust possibly exists in the manufactured air environment or the quality of a diaphragm is poor, a tiny short circuit phenomenon can occur between internal battery cells or in a single battery cell, the short circuit does not directly burn out the batteries, but the performance of the battery cell is reduced in a short time (several weeks or months), and a certain battery cell or the whole battery pack cannot be used at all.
If the early stage of the micro short circuit of the battery is not timely processed, the early stage of the micro short circuit of the battery possibly evolves into the short circuit of the battery, and once the short circuit of the battery occurs, accidents such as burning, explosion and the like can be accompanied, so that the loss of personnel and property is caused. For the self-discharging phenomenon of the battery, if the self-discharging phenomenon can be timely found and processed, the problem of the battery can be effectively avoided, the battery with the situation is timely found to be important, early warning is timely carried out, risks such as combustion and explosion of the battery can be effectively avoided, and the safety performance is improved.
The current mainstream internal short circuit detection method is to stand the battery for a long time, and as the micro short circuit battery continuously has self-discharge in the standing process, the voltage of the micro short circuit battery can be reduced along with the reduction of the state of charge (SOC), and the corresponding SOC can be obtained by measuring the voltage difference before and after standing, so that the corresponding internal short circuit degree can be obtained. However, this method has a disadvantage in that for LFP (LiFePO 4, lithium iron phosphate) batteries, which have a voltage plateau in a large SOC interval, the battery needs to be kept at a constant temperature for 7 to 30 days, and a high-precision measuring device is used to measure the voltage change due to the internal short circuit. The measurement time is long, and the equipment requirement is high.
Disclosure of Invention
The invention aims to overcome the defect that in the prior art, the battery is required to be kept at a constant temperature for a long time to cause low detection efficiency in the detection of the internal short circuit of the battery, and provides a calibration method, a measurement method, a system, equipment and a medium for the internal short circuit of a module.
The invention solves the technical problems by the following technical scheme:
the invention provides a calibration method for an internal short circuit of a battery module, which comprises the following steps:
setting a preset simulated short-circuit current in a battery module, and acquiring a voltage value of the battery module in a charge-discharge cycle process;
and determining a calibration standard of the battery module according to the corresponding relation between the change rate of the voltage value and the simulated short-circuit current.
Preferably, the step of setting a preset analog short-circuit current in the battery module includes:
and connecting the preselected battery cells of the battery module in parallel with an electronic load, and setting the discharge current of the electronic load to set the simulated short-circuit current.
Preferably, after the step of obtaining the voltage value of the battery module during the charge-discharge cycle, the calibration method further includes:
charging the preselected battery cells individually to bring the preselected battery cells to a standard state;
and setting different simulated short-circuit currents for the battery module, and acquiring the voltage value of the battery module in the charge-discharge cycle process.
Preferably, the step of determining the calibration standard of the battery module according to the correspondence between the rate of change of the voltage value and the simulated short-circuit current includes:
determining standard components of each battery cell of the battery module according to the voltage value; the standard is used for representing the degree of dispersion of the voltage value of each battery cell of the battery module in the charge-discharge cycle process;
determining the change rate of the median value of the standard branch along with the number of charge and discharge cycles according to the median value of the standard branch of each battery cell in each charge and discharge cycle;
and determining a calibration standard of the battery module according to the corresponding relation between the change rate and the simulated short-circuit current.
Preferably, the standard score is determined according to the following formula:
Z score (t)＝(V i (t)-mean(t))/std(t)；
wherein Z is score (t) is the standard component of the i-number battery cell at t time, V i And (t) is the voltage of the i-type battery cell at the moment t, mean (t) is the voltage average value of all the battery cells at the moment t, and std (t) is the voltage standard deviation of all the battery cells at the moment t.
Preferably, the step of determining the rate of change of the median value of the standard score with the number of cycles according to the median value of the standard score of each cell during each charge-discharge cycle includes:
determining the slope of the median value of the standard branch along with the change of the cycle number according to the standard box division diagram of each cell;
the step of determining the calibration standard of the battery module according to the corresponding relation between the change rate and the simulated short-circuit current comprises the following steps:
and determining a calibration reference curve of each battery cell of the battery module according to the corresponding relation between the slope and the simulated short-circuit current.
Preferably, the step of obtaining the voltage value of the battery module in the charge-discharge cycle process includes:
and acquiring a charging voltage value of the battery module in a charging and discharging cycle process.
The invention also provides a measurement method of the internal short circuit of the battery module, which comprises the following steps:
acquiring a voltage value of a battery module to be tested in a charge-discharge cycle process;
and determining the short-circuit current of the battery module according to the change rate of the voltage value and a calibration standard obtained by using the calibration method of the internal short circuit of the battery module.
The invention also provides a calibration system of the internal short circuit of the battery module, which comprises:
the short-circuit state simulation module is used for setting preset simulated short-circuit current in the battery module and obtaining a voltage value of the battery module in a charge-discharge cycle process;
and the calibration standard determining module is used for determining the calibration standard of the battery module according to the corresponding relation between the change rate of the voltage value and the simulated short-circuit current.
Preferably, the short-circuit state simulation module is specifically configured to connect the preselected battery cells of the battery module in parallel with an electronic load, and set a discharge current of the electronic load to set the simulated short-circuit current.
Preferably, the calibration system further comprises:
the battery cell charging module is used for independently charging the preselected battery cells so as to enable the preselected battery cells to reach a standard state;
the short-circuit state simulation module is specifically used for setting different simulated short-circuit currents for the battery module and obtaining the voltage value of the battery module in the charge-discharge cycle process.
Preferably, the calibration reference determining module is specifically configured to determine a standard score of each cell of the battery module according to the voltage value; the standard is used for representing the degree of dispersion of the voltage value of each battery cell of the battery module in the charge-discharge cycle process;
the calibration reference determining module is specifically used for determining the change rate of the median value of the standard branch along with the number of charge and discharge cycles according to the median value of the standard branch in each charge and discharge cycle process of each battery cell;
the calibration standard determining module is specifically configured to determine a calibration standard of the battery module according to a corresponding relationship between the change rate and the simulated short-circuit current.
Preferably, the standard score is determined according to the following formula:
Z score (t)＝(V i (t)-mean(t))/std(t)；
wherein Z is score (t) is the standard component of the i-number battery cell at t time, V i And (t) is the voltage of the i-type battery cell at the moment t, mean (t) is the voltage average value of all the battery cells at the moment t, and std (t) is the voltage standard deviation of all the battery cells at the moment t.
Preferably, the calibration reference determining module is specifically configured to determine a slope of a median value of the standard score along with a cycle number change according to a standard bin type diagram of each cell;
the calibration reference determining module is specifically configured to determine a calibration reference curve of each cell of the battery module according to a corresponding relationship between the slope and the simulated short-circuit current.
Preferably, the short-circuit state simulation module is specifically configured to obtain a charging voltage value of the battery module in a charging and discharging cycle process.
The invention also provides a measurement system of the internal short circuit of the battery module, which comprises:
the charging voltage acquisition module is used for acquiring the voltage value of the battery module to be tested in the charging and discharging cycle process;
and the short-circuit current determining module is used for determining the short-circuit current of the battery module according to the change rate of the voltage value and a calibration standard obtained by using the calibration system of the internal short circuit of the battery module.
The invention also provides an electronic device, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor realizes the calibration method of the internal short circuit of the battery module or the measurement method of the internal short circuit of the battery module when executing the computer program.
The present invention also provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements a calibration method of an internal short circuit of a battery module as described above or a measurement method of an internal short circuit of a battery module as described above.
The invention has the positive progress effects that:
according to the calibration method and the measurement method for the internal short circuit of the battery module, the simulated short circuit current is arranged in the battery module to simulate the internal short circuit of the battery cell, charge and discharge cycles are carried out, and the median value of the standard components of the voltage of the battery cell in the module and the variation trend of the voltage of the battery cell along with the increase of the cycle times in the charge and discharge processes are calculated; the severity of the internal short circuit of the analog battery cell is changed by changing the analog short circuit current, so that the change trend and the slope of the standard median along with the self-discharge current of the internal short circuit are obtained, and the standard trend and the slope are used as calibration standards. And (3) carrying out charge-discharge circulation on the uncalibrated new replacement battery core, and comparing the calibrated result according to the slope of the standard median in the circulation process to obtain the internal short-circuit degree of the battery core, so that the micro-short circuit condition of the battery can be detected in a shorter time, and the combustion explosion of the battery can be better prevented. Compared with the prior art, the detection speed is high, long-term standing of the battery is not needed, and the battery core is not needed to be detached for detection; in addition, the calibrated result can be used on the same type of battery cell, and the expansibility is strong.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present specification, the drawings that are required to be used in the description of the embodiments will be briefly described below. It is apparent that the drawings in the following description are only some examples or embodiments of the present specification, and it is possible for those of ordinary skill in the art to apply the present specification to other similar situations according to the drawings without inventive effort.
Fig. 1 is a first flowchart of a calibration method for an internal short circuit of a battery module according to embodiment 1 of the present invention.
Fig. 2 is a second flowchart of the calibration method of the internal short circuit of the battery module in embodiment 1 of the present invention.
Fig. 3 is a schematic diagram showing the voltage variation of the battery cells of the battery module according to embodiment 1 of the present invention.
Fig. 4 is a box-shaped diagram showing the variation of the standard median of the battery cells of the battery module according to the embodiment 1 of the present invention with the number of charge and discharge cycles.
Fig. 5 is a schematic diagram showing the correspondence between the standard component change rate and the internal short-circuit current of the battery module cell in embodiment 1 of the present invention.
Fig. 6 is a schematic structural diagram of a calibration system for an internal short circuit of a battery module in embodiment 3 of the present invention.
Fig. 7 is a schematic structural diagram of an electronic device in embodiment 5 of the present invention.
Detailed Description
The invention is further illustrated by means of the following examples, which are not intended to limit the scope of the invention.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
It will be appreciated that "system," "apparatus," "unit" and/or "module" as used herein is one method for distinguishing between different components, elements, parts, portions or assemblies of different levels. However, if other words can achieve the same purpose, the words can be replaced by other expressions.
As used herein, the terms "a," "an," "the," and/or "the" are not specific to the singular, but may include the plural, unless the context clearly indicates otherwise. In general, the terms "comprises" and "comprising" merely indicate that the steps and elements are explicitly identified, and they do not constitute an exclusive list, as other steps or elements may be included in a method or apparatus.
The terms "having," "can have," "including," or "can include," as used herein, are intended to refer to the existence of a corresponding function, operation, element, etc. herein and are not intended to limit the existence of other one or more functions, operations, elements, etc. Furthermore, it should be understood that the terms "comprises" or "comprising," as used herein, are intended to specify the presence of stated features, integers, steps, operations, elements, components, or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof.
The term "a or B", "at least one of a and/or B" or "one or more of a and/or B" as used herein includes any and all combinations of words listed therewith. For example, "a or B", "at least one of a and B" or "at least one of a or B" means (1) including at least one a, (2) including at least one B, or (3) including both at least one a and at least one B.
Flowcharts are used herein to describe the operations performed by systems according to embodiments herein. It should be appreciated that the preceding or following operations are not necessarily performed in order precisely. Rather, the steps may be processed in reverse order or simultaneously. Also, other operations may be added to or removed from these processes.
Example 1
Please refer to fig. 1, which is a first flowchart of a calibration method of an internal short circuit of a battery module in the present embodiment. Specifically, as shown in fig. 1, the calibration method includes:
s101, setting a preset simulated short-circuit current in a battery module, and acquiring a voltage value of the battery module in a charge-discharge cycle process;
s102, determining a calibration standard of the battery module according to the corresponding relation between the change rate of the voltage value and the simulated short-circuit current.
Please refer to fig. 2, which is a second flowchart of the calibration method of the battery module internal short circuit in the present embodiment. Specifically, as shown in fig. 2, in an alternative embodiment, step S101 includes:
s1011, connecting the preselected battery cells of the battery module in parallel with an electronic load, and setting the discharge current of the electronic load to set the simulated short-circuit current. Specifically, an electronic load may be connected in parallel with a cell in the battery module, and the electronic load is set to discharge from the cell with a constant current as a micro-short circuit current, and an external short circuit is used to simulate capacity fading caused by an internal short circuit. And (3) circularly charging and discharging the battery module by using charging and discharging equipment, and recording the single voltage of each battery cell.
In this embodiment, step S101 includes:
s1012, acquiring a charging voltage value of the battery module in the charging and discharging cycle process. Fig. 3 is a schematic diagram showing a change of the voltage of the battery cell with time in the present embodiment. Specifically, as shown in fig. 3, at the start point of the charging process, the voltage of each cell has a larger degree of distinction with time, i.e. the distinction of lines in the solid line frame in the figure is significant; when the charging is finished and the discharging process is started, no distinction is made, namely lines in a dashed line frame in the figure are basically overlapped, and the distinction is not obvious. Therefore, it is preferable to acquire the charge voltage value of the battery module during the charge-discharge cycle.
In an alternative embodiment, after step S101, the calibration method further includes:
s201, independently charging the preselected battery cells to enable the preselected battery cells to reach a standard state;
s202, setting different simulated short-circuit currents for the battery module, and acquiring a voltage value of the battery module in a charge-discharge cycle process. Specifically, in the charge-discharge cycle process, the micro-short-circuited battery core cannot reach the standard capacity of the battery core, and the micro-short-circuited battery core needs to be independently charged, so that the electric quantity discharged by the internal short circuit is charged with small current, and the consistency of the module is restored. And changing the discharge current of the electronic load, and repeating the steps until the voltage data of the battery cells of the micro-short circuit currents with different orders of magnitude are obtained.
In another alternative embodiment, step S102 includes:
s1021, determining standard components of each battery cell of the battery module according to the voltage value; the standard is used for representing the discrete degree of the voltage value of each battery cell of the battery module in the charge-discharge cycle process;
specifically, the standard score is determined according to the following formula:
Z score (t)＝(V i (t)-mean(t))/std(t)；
wherein Z is score (t) is the standard component of the i-number battery cell at t time, V i And (t) is the voltage of the i-type battery cell at the moment t, mean (t) is the voltage average value of all the battery cells at the moment t, and std (t) is the voltage standard deviation of all the battery cells at the moment t.
S1022, determining the change rate of the median value of the standard score along with the number of charge and discharge cycles according to the median value of the standard score of each battery cell in each charge and discharge cycle;
s1023, determining a calibration standard of the battery module according to the corresponding relation between the change rate and the simulated short-circuit current.
In the present embodiment, step S1022 includes: determining the slope of the median value of the standard division along with the change of the cycle number according to the standard box division diagram of each cell;
step S1023 includes: and determining a calibration reference curve of each cell of the battery module according to the corresponding relation between the slope and the simulated short-circuit current.
The following is further described by way of specific examples. After the battery module is connected with the BMS (battery management system ), an electronic load is connected with one of the battery cells in parallel, the electronic load is set to discharge from the battery cell with a constant current, the battery cell is used as a micro short circuit current, and capacity attenuation caused by internal short circuit is simulated by external short circuit. And (3) circularly charging and discharging the battery module by using charging and discharging equipment, recording the single voltage of each battery cell, setting the upper and lower limits of the voltage to be 2.9 and 3.5V (volts), and charging and discharging by using 1C (coulomb) current for 20 times. As shown in fig. 3, the change in cell voltage with time was measured. And (3) independently supplementing electricity to the micro-short-circuited battery cells, and filling small current into the micro-short-circuited battery cells to restore the consistency of the module. And changing the discharge current of the electronic load, and repeating the steps until the voltage data of the battery cells of the micro-short circuit currents with different orders of magnitude are obtained.
And (3) the voltage in the charging process is advanced, a standard score Z_score (t) is calculated according to the formula, and the standard scores of all the battery cells at all t moments are calculated. And extracting the standard score of the charging time in the single charging and discharging cycle according to the time used by the single charging and discharging cycle, and respectively calculating the median value Z_middle of the standard score in the single charging time of each battery cell. And the change of Z_middle along with the cycle number is obtained. As shown in fig. 4, the slope of the current is calculated as k_c, and the values of k_c at different micro-short-circuit currents are compared to find that the internal short-circuit current i_isc and the slope k_c have an approximately linear relationship. As shown in fig. 5, the measured data are used to map the slope k_c and the internal short circuit current i_isc, which can be used as a calibration reference curve.
For the same type of battery modules to be tested, 5 cycles are charged and discharged under the same condition, and the slope k_c1 measured by the cycles is compared with the calibrated slope k_c, so that the corresponding internal short-circuit current I_isc can be obtained. Meanwhile, the internal short circuit grade of the battery can be graded, and different measures can be taken for different grades. And obtaining the corresponding severity level of the internal short circuit according to the obtained internal short circuit current and taking corresponding measures.
According to the calibration method for the internal short circuit of the battery module, the battery module is internally provided with the simulated short circuit current to simulate the internal short circuit of the battery cell, charge and discharge circulation is carried out, and the median value of the standard components of the voltage of the battery cell in the battery module in the charge and discharge process and the variation trend of the median value along with the increase of the circulation times are calculated; the severity of the internal short circuit of the analog battery cell is changed by changing the analog short circuit current, so that the change trend and the slope of the standard median along with the self-discharge current of the internal short circuit are obtained, and the standard trend and the slope are used as calibration standards. And (3) carrying out charge-discharge circulation on the uncalibrated new replacement battery core, and comparing the calibrated result according to the slope of the standard median in the circulation process to obtain the internal short-circuit degree of the battery core, so that the micro-short circuit condition of the battery can be detected in a shorter time, and the combustion explosion of the battery can be better prevented. Compared with the prior art, the detection speed is high, long-term standing of the battery is not needed, and the battery core is not needed to be detached for detection; in addition, the calibrated result can be used on the same type of battery cell, and the expansibility is strong.
Example 2
The embodiment provides a measurement method for an internal short circuit of a battery module, which comprises the following steps:
acquiring a voltage value of a battery module to be tested in a charge-discharge cycle process;
the short-circuit current of the battery module was determined according to the rate of change of the voltage value and a calibration standard obtained by using the calibration method of the internal short-circuit of the battery module in example 1.
According to the calibration method for the internal short circuit of the battery module, the short circuit current of the battery module is determined by using the calibration standard obtained by the calibration method for the internal short circuit of the battery module, compared with the prior art, the detection speed is high, long-term standing of the battery is not needed, and the battery core is not needed to be detached for detection; in addition, the same type of battery cell shares the calibration standard, so that the expansibility is strong.
Example 3
Fig. 6 is a schematic structural diagram of a calibration system for an internal short circuit of a battery module according to the present embodiment. Specifically, as shown in fig. 6, the calibration system includes:
the short-circuit state simulation module 1 is used for setting a preset simulated short-circuit current in the battery module and obtaining a voltage value of the battery module in a charge-discharge cycle process;
the short-circuit state simulation module is specifically used for acquiring a charging voltage value of the battery module in a charging and discharging cycle process.
And the calibration standard determining module 2 is used for determining the calibration standard of the battery module according to the corresponding relation between the change rate of the voltage value and the simulated short-circuit current.
In an alternative embodiment, the short-circuit state simulation module is specifically configured to connect preselected cells of the battery module in parallel with the electronic load and set a discharge current of the electronic load to set the simulated short-circuit current.
In an alternative embodiment, the calibration system further comprises:
the battery cell charging module is used for independently charging the preselected battery cells so as to enable the preselected battery cells to reach a standard state;
the short-circuit state simulation module is specifically used for setting different simulated short-circuit currents for the battery module and obtaining the voltage value of the battery module in the charge-discharge cycle process.
In an alternative embodiment, the calibration reference determining module is specifically configured to determine a standard score of each cell of the battery module according to the voltage value; the standard is used for representing the discrete degree of the voltage value of each battery cell of the battery module in the charge-discharge cycle process;
the calibration reference determining module is specifically used for determining the change rate of the median value of the standard score along with the number of charge and discharge cycles according to the median value of the standard score of each battery cell in each charge and discharge cycle;
the calibration standard determining module is specifically used for determining a calibration standard of the battery module according to the corresponding relation between the change rate and the simulated short-circuit current.
Specifically, the standard score is determined according to the following formula:
Z score (t)＝(V i (t)-mean(t))/std(t)；
wherein Z is score (t) is the standard component of the i-number battery cell at t time, V i And (t) is the voltage of the i-type battery cell at the moment t, mean (t) is the voltage average value of all the battery cells at the moment t, and std (t) is the voltage standard deviation of all the battery cells at the moment t.
In another optional implementation manner, the calibration reference determining module is specifically configured to determine a slope of a median value of the standard score along with a cycle number according to a standard bin pattern of each cell;
the calibration reference determining module is specifically configured to determine a calibration reference curve of each cell of the battery module according to a corresponding relationship between the slope and the simulated short-circuit current.
According to the calibration system for the internal short circuit of the battery module, the battery module is internally provided with the simulated short circuit current to simulate the internal short circuit of the battery cell, charge and discharge circulation is carried out, and the median value of the standard components of the voltage of the battery cell in the battery module in the charge and discharge process and the variation trend of the median value along with the increase of the circulation times are calculated; the severity of the internal short circuit of the analog battery cell is changed by changing the analog short circuit current, so that the change trend and the slope of the standard median along with the self-discharge current of the internal short circuit are obtained, and the standard trend and the slope are used as calibration standards. And (3) carrying out charge-discharge circulation on the uncalibrated new replacement battery core, and comparing the calibrated result according to the slope of the standard median in the circulation process to obtain the internal short-circuit degree of the battery core, so that the micro-short circuit condition of the battery can be detected in a shorter time, and the combustion explosion of the battery can be better prevented. Compared with the prior art, the detection speed is high, long-term standing of the battery is not needed, and the battery core is not needed to be detached for detection; in addition, the calibrated result can be used on the same type of battery cell, and the expansibility is strong.
Example 4
The embodiment also provides a measurement system for the internal short circuit of the battery module, the measurement system comprises:
the charging voltage acquisition module is used for acquiring the voltage value of the battery module to be tested in the charging and discharging cycle process;
and the short-circuit current determining module is used for determining the short-circuit current of the battery module according to the change rate of the voltage value and a calibration standard obtained by using the calibration system of the internal short circuit of the battery module.
According to the calibration system for the internal short circuit of the battery module, the short circuit current of the battery module is determined by using the calibration standard obtained by the calibration system for the internal short circuit of the battery module, compared with the prior art, the detection speed is high, long-term standing of the battery is not needed, and the battery core is not needed to be detached for detection; in addition, the same type of battery cell shares the calibration standard, so that the expansibility is strong.
Example 5
Fig. 7 is a schematic structural diagram of an electronic device according to embodiment 5 of the present invention. The electronic device includes a memory, a processor, and a computer program stored on the memory and executable on the processor, where the processor implements the calibration method of the internal short circuit of the battery module of embodiment 1 or the measurement method of the internal short circuit of the battery module of embodiment 2 when executing the program. The electronic device 30 shown in fig. 7 is only an example and should not be construed as limiting the functionality and scope of use of embodiments of the present invention.
As shown in fig. 7, the electronic device 30 may be embodied in the form of a general purpose computing device, which may be a server device, for example. Components of electronic device 30 may include, but are not limited to: the at least one processor 31, the at least one memory 32, a bus 33 connecting the different system components, including the memory 32 and the processor 31.
The bus 33 includes a data bus, an address bus, and a control bus.
Memory 32 may include volatile memory such as Random Access Memory (RAM) 321 and/or cache memory 322, and may further include Read Only Memory (ROM) 323.
Memory 32 may also include a program/utility 325 having a set (at least one) of program modules 324, such program modules 324 including, but not limited to: an operating system, one or more application programs, other program modules, and program data, each or some combination of which may include an implementation of a network environment.
The processor 31 executes a computer program stored in the memory 32 to thereby perform various functional applications and data processing, such as the calibration method of the internal short circuit of the battery module of embodiment 1 or the measurement method of the internal short circuit of the battery module of embodiment 2 of the present invention.
The electronic device 30 may also communicate with one or more external devices 34 (e.g., keyboard, pointing device, etc.). Such communication may be through an input/output (I/O) interface 35. Also, model-generating device 30 may also communicate with one or more networks, such as a Local Area Network (LAN), a Wide Area Network (WAN), and/or a public network, such as the internet, via network adapter 36. As shown, network adapter 36 communicates with the other modules of model-generating device 30 via bus 33. It should be appreciated that although not shown in the figures, other hardware and/or software modules may be used in connection with the model-generating device 30, including, but not limited to: microcode, device drivers, redundant processors, external disk drive arrays, RAID (disk array) systems, tape drives, data backup storage systems, and the like.
It should be noted that although several units/modules or sub-units/modules of an electronic device are mentioned in the above detailed description, such a division is merely exemplary and not mandatory. Indeed, the features and functionality of two or more units/modules described above may be embodied in one unit/module in accordance with embodiments of the present invention. Conversely, the features and functions of one unit/module described above may be further divided into ones that are embodied by a plurality of units/modules.
Example 6
The present embodiment provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the calibration method of the battery module internal short circuit of embodiment 1 or the measurement method of the battery module internal short circuit of embodiment 2.
More specifically, among others, readable storage media may be employed including, but not limited to: portable disk, hard disk, random access memory, read only memory, erasable programmable read only memory, optical storage device, magnetic storage device, or any suitable combination of the foregoing.
In a possible embodiment, the invention may also be implemented in the form of a program product comprising program code for causing a terminal device to carry out the calibration method for implementing the intra-module short circuit of example 1 or the measurement method for the intra-module short circuit of example 2, when said program product is run on the terminal device.
Wherein the program code for carrying out the invention may be written in any combination of one or more programming languages, which program code may execute entirely on the user device, partly on the user device, as a stand-alone software package, partly on the user device and partly on the remote device or entirely on the remote device.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the principles and spirit of the invention, but such changes and modifications fall within the scope of the invention.
Claims (12)
1. The calibration method for the internal short circuit of the battery module is characterized by comprising the following steps of:
setting a preset simulated short-circuit current in a battery module, and acquiring a voltage value of the battery module in a charge-discharge cycle process;
and determining a calibration standard of the battery module according to the corresponding relation between the change rate of the voltage value and the simulated short-circuit current.
2. The calibration method according to claim 1, wherein the step of setting a preset analog short-circuit current in the battery module includes:
and connecting the preselected battery cells of the battery module in parallel with an electronic load, and setting the discharge current of the electronic load to set the simulated short-circuit current.
3. The calibration method according to claim 2, wherein after the step of acquiring the voltage value of the battery module during the charge-discharge cycle, the calibration method further comprises:
charging the preselected battery cells individually to bring the preselected battery cells to a standard state;
and setting different simulated short-circuit currents for the battery module, and acquiring the voltage value of the battery module in the charge-discharge cycle process.
4. The calibration method according to any one of claims 1 to 3, wherein the step of determining the calibration standard of the battery module according to the correspondence between the rate of change of the voltage value and the simulated short-circuit current includes:
determining standard components of each battery cell of the battery module according to the voltage value; the standard is used for representing the degree of dispersion of the voltage value of each battery cell of the battery module in the charge-discharge cycle process;
determining the change rate of the median value of the standard branch along with the number of charge and discharge cycles according to the median value of the standard branch of each battery cell in each charge and discharge cycle;
and determining a calibration standard of the battery module according to the corresponding relation between the change rate and the simulated short-circuit current.
5. The calibration method of claim 4, wherein the standard deviation is determined according to the following formula:
Z score (t)＝(V i (t)-mean(t))/std(t)；
wherein Z is score (t) is the standard component of the i-number battery cell at t time, V i And (t) is the voltage of the i-type battery cell at the moment t, mean (t) is the voltage average value of all the battery cells at the moment t, and std (t) is the voltage standard deviation of all the battery cells at the moment t.
6. The calibration method according to claim 4 or 5, wherein the step of determining the rate of change of the median value of the standard cell with the number of cycles according to the median value of the standard cell during each charge-discharge cycle comprises:
determining the slope of the median value of the standard branch along with the change of the cycle number according to the standard box division diagram of each cell;
the step of determining the calibration standard of the battery module according to the corresponding relation between the change rate and the simulated short-circuit current comprises the following steps:
and determining a calibration reference curve of each battery cell of the battery module according to the corresponding relation between the slope and the simulated short-circuit current.
7. The calibration method according to any one of claims 1-6, wherein the step of obtaining the voltage value of the battery module during the charge-discharge cycle comprises:
and acquiring a charging voltage value of the battery module in a charging and discharging cycle process.
8. A method for measuring an internal short circuit of a battery module, the method comprising:
acquiring a voltage value of a battery module to be tested in a charge-discharge cycle process;
determining the short-circuit current of the battery module according to the change rate of the voltage value and a calibration standard obtained by using the calibration method for the internal short circuit of the battery module according to any one of claims 1 to 7.
9. A calibration system for an internal short circuit of a battery module, the calibration system comprising:
the short-circuit state simulation module is used for setting preset simulated short-circuit current in the battery module and obtaining a voltage value of the battery module in a charge-discharge cycle process;
and the calibration standard determining module is used for determining the calibration standard of the battery module according to the corresponding relation between the change rate of the voltage value and the simulated short-circuit current.
10. A measurement system for an internal short circuit of a battery module, the measurement system comprising:
the charging voltage acquisition module is used for acquiring the voltage value of the battery module to be tested in the charging and discharging cycle process;
and the short-circuit current determining module is used for determining the short-circuit current of the battery module according to the change rate of the voltage value and the calibration standard obtained by the calibration system of the internal short circuit of the battery module.
11. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor, when executing the computer program, implements a method for calibrating an internal short circuit of a battery module according to any one of claims 1 to 7 or a method for measuring an internal short circuit of a battery module according to claim 8.
12. A computer-readable storage medium, on which a computer program is stored, characterized in that the computer program, when executed by a processor, implements the calibration method of the internal short circuit of the battery module according to any one of claims 1 to 7 or the measurement method of the internal short circuit of the battery module according to claim 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310465876.2A CN116482551B (en) | 2023-04-26 | 2023-04-26 | Calibration method, measurement method, system, equipment and medium for short circuit in module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310465876.2A CN116482551B (en) | 2023-04-26 | 2023-04-26 | Calibration method, measurement method, system, equipment and medium for short circuit in module |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116482551A true CN116482551A (en) | 2023-07-25 |
| CN116482551B CN116482551B (en) | 2024-03-29 |
Family
ID=87221100
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310465876.2A Active CN116482551B (en) | 2023-04-26 | 2023-04-26 | Calibration method, measurement method, system, equipment and medium for short circuit in module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116482551B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116068441A (en) * | 2021-10-29 | 2023-05-05 | 北汽福田汽车股份有限公司 | Power battery internal short circuit early warning method and device and vehicle |
| CN116072990A (en) * | 2021-10-29 | 2023-05-05 | 北汽福田汽车股份有限公司 | Power battery internal short circuit early warning method and device and vehicle |
Citations (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090099799A1 (en) * | 2007-10-10 | 2009-04-16 | Texas Instruments Incorporated | Systems, Methods and Circuits for Determining Micro-Short |
| US20100188054A1 (en) * | 2007-07-26 | 2010-07-29 | Jun Asakura | Battery internal short-circuit detecting device and method, battery pack, and electronic device system |
| CN109471040A (en) * | 2018-10-16 | 2019-03-15 | 深圳市普兰德储能技术有限公司 | Capacity determination method, device, electronic equipment and computer readable storage medium |
| CN110687457A (en) * | 2019-11-13 | 2020-01-14 | 东软睿驰汽车技术（沈阳）有限公司 | Battery pack abnormity detection method and device, storage medium and electronic equipment |
| CN110780211A (en) * | 2019-06-04 | 2020-02-11 | 清华大学 | Battery internal short circuit simulation method based on embedded resistor |
| CN111976539A (en) * | 2020-07-23 | 2020-11-24 | 蜂巢能源科技有限公司 | Method, apparatus, medium, and device for determining voltage change rate of battery |
| CN113533966A (en) * | 2021-07-21 | 2021-10-22 | 欣旺达电动汽车电池有限公司 | Method and device for measuring short circuit resistance value in battery and computer readable storage medium |
| CN113533981A (en) * | 2021-07-30 | 2021-10-22 | 蜂巢能源科技有限公司 | Lithium ion battery self-discharge detection method and device and computer readable storage medium |
| CN113848489A (en) * | 2021-09-10 | 2021-12-28 | 欣旺达电动汽车电池有限公司 | Battery short circuit identification method and device and storage medium |
| CN114137417A (en) * | 2021-11-19 | 2022-03-04 | 北京理工大学 | Battery internal short circuit detection method based on charging data characteristics |
| CN114152826A (en) * | 2021-11-19 | 2022-03-08 | 北京理工大学 | Method for detecting short circuit in lithium ion battery unit |
| CN114252792A (en) * | 2021-12-23 | 2022-03-29 | 蜂巢能源科技(无锡)有限公司 | Method and device for detecting internal short circuit of battery pack, electronic equipment and storage medium |
| CN114295988A (en) * | 2020-12-30 | 2022-04-08 | 华为数字能源技术有限公司 | Battery pack fault detection circuit and battery pack fault detection method |
| CN114460469A (en) * | 2022-01-26 | 2022-05-10 | 上海玫克生智能科技有限公司 | Battery state analysis method, system and terminal based on voltage and current |
| CN114910795A (en) * | 2022-05-27 | 2022-08-16 | 上海玫克生储能科技有限公司 | Battery micro-short circuit judgment method and system in constant current charging, storage medium and terminal |
| CN115079007A (en) * | 2022-06-24 | 2022-09-20 | 上海玫克生储能科技有限公司 | Lithium ion battery micro short circuit identification method, lithium ion battery micro short circuit identification system and battery management system |
| US20220334195A1 (en) * | 2020-06-23 | 2022-10-20 | University Of Shanghai For Science And Technology | Method for Quantitative Diagnosis of Electricity Leakage or Micro-short-circuit in Single Cells Based on Capacity Estimation |
| WO2023274318A1 (en) * | 2021-06-29 | 2023-01-05 | 蜂巢能源科技股份有限公司 | Method and apparatus for diagnosing burst-type internal short circuit of battery, and storage medium and electronic device |
| CN115598547A (en) * | 2022-09-26 | 2023-01-13 | 联想（北京）有限公司（Cn） | Battery detection method and device |
| CN115621584A (en) * | 2021-07-13 | 2023-01-17 | 上海派能能源科技股份有限公司 | Method and system for diagnosing internal short circuit abnormality of lithium battery pack |
| CN115622165A (en) * | 2021-07-14 | 2023-01-17 | 通用汽车环球科技运作有限责任公司 | Method for early detection of internal short circuit of battery pack |
| WO2023016128A1 (en) * | 2021-08-09 | 2023-02-16 | 江苏时代新能源科技有限公司 | Battery cell self-discharge current detection method and apparatus, device and computer storage medium |
| CN115774200A (en) * | 2022-12-09 | 2023-03-10 | 国联汽车动力电池研究院有限责任公司 | Micro/internal short circuit detection method for lithium ion battery series module |
| CN116008836A (en) * | 2022-12-01 | 2023-04-25 | 章鱼博士智能技术(上海)有限公司 | Short circuit detection method and device for battery and storage medium |
-
2023
- 2023-04-26 CN CN202310465876.2A patent/CN116482551B/en active Active
Patent Citations (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100188054A1 (en) * | 2007-07-26 | 2010-07-29 | Jun Asakura | Battery internal short-circuit detecting device and method, battery pack, and electronic device system |
| US20090099799A1 (en) * | 2007-10-10 | 2009-04-16 | Texas Instruments Incorporated | Systems, Methods and Circuits for Determining Micro-Short |
| CN109471040A (en) * | 2018-10-16 | 2019-03-15 | 深圳市普兰德储能技术有限公司 | Capacity determination method, device, electronic equipment and computer readable storage medium |
| CN110780211A (en) * | 2019-06-04 | 2020-02-11 | 清华大学 | Battery internal short circuit simulation method based on embedded resistor |
| CN110687457A (en) * | 2019-11-13 | 2020-01-14 | 东软睿驰汽车技术（沈阳）有限公司 | Battery pack abnormity detection method and device, storage medium and electronic equipment |
| US20220334195A1 (en) * | 2020-06-23 | 2022-10-20 | University Of Shanghai For Science And Technology | Method for Quantitative Diagnosis of Electricity Leakage or Micro-short-circuit in Single Cells Based on Capacity Estimation |
| CN111976539A (en) * | 2020-07-23 | 2020-11-24 | 蜂巢能源科技有限公司 | Method, apparatus, medium, and device for determining voltage change rate of battery |
| CN114295988A (en) * | 2020-12-30 | 2022-04-08 | 华为数字能源技术有限公司 | Battery pack fault detection circuit and battery pack fault detection method |
| WO2023274318A1 (en) * | 2021-06-29 | 2023-01-05 | 蜂巢能源科技股份有限公司 | Method and apparatus for diagnosing burst-type internal short circuit of battery, and storage medium and electronic device |
| CN115621584A (en) * | 2021-07-13 | 2023-01-17 | 上海派能能源科技股份有限公司 | Method and system for diagnosing internal short circuit abnormality of lithium battery pack |
| CN115622165A (en) * | 2021-07-14 | 2023-01-17 | 通用汽车环球科技运作有限责任公司 | Method for early detection of internal short circuit of battery pack |
| CN113533966A (en) * | 2021-07-21 | 2021-10-22 | 欣旺达电动汽车电池有限公司 | Method and device for measuring short circuit resistance value in battery and computer readable storage medium |
| CN113533981A (en) * | 2021-07-30 | 2021-10-22 | 蜂巢能源科技有限公司 | Lithium ion battery self-discharge detection method and device and computer readable storage medium |
| WO2023016128A1 (en) * | 2021-08-09 | 2023-02-16 | 江苏时代新能源科技有限公司 | Battery cell self-discharge current detection method and apparatus, device and computer storage medium |
| CN113848489A (en) * | 2021-09-10 | 2021-12-28 | 欣旺达电动汽车电池有限公司 | Battery short circuit identification method and device and storage medium |
| CN114152826A (en) * | 2021-11-19 | 2022-03-08 | 北京理工大学 | Method for detecting short circuit in lithium ion battery unit |
| CN114137417A (en) * | 2021-11-19 | 2022-03-04 | 北京理工大学 | Battery internal short circuit detection method based on charging data characteristics |
| CN114252792A (en) * | 2021-12-23 | 2022-03-29 | 蜂巢能源科技(无锡)有限公司 | Method and device for detecting internal short circuit of battery pack, electronic equipment and storage medium |
| CN114460469A (en) * | 2022-01-26 | 2022-05-10 | 上海玫克生智能科技有限公司 | Battery state analysis method, system and terminal based on voltage and current |
| CN114910795A (en) * | 2022-05-27 | 2022-08-16 | 上海玫克生储能科技有限公司 | Battery micro-short circuit judgment method and system in constant current charging, storage medium and terminal |
| CN115079007A (en) * | 2022-06-24 | 2022-09-20 | 上海玫克生储能科技有限公司 | Lithium ion battery micro short circuit identification method, lithium ion battery micro short circuit identification system and battery management system |
| CN115598547A (en) * | 2022-09-26 | 2023-01-13 | 联想（北京）有限公司（Cn） | Battery detection method and device |
| CN116008836A (en) * | 2022-12-01 | 2023-04-25 | 章鱼博士智能技术(上海)有限公司 | Short circuit detection method and device for battery and storage medium |
| CN115774200A (en) * | 2022-12-09 | 2023-03-10 | 国联汽车动力电池研究院有限责任公司 | Micro/internal short circuit detection method for lithium ion battery series module |
Non-Patent Citations (2)
| Title |
|---|
| ZHANG, MX等: "Internal short circuit detection method for battery pack based on circuit topology", 《SCIENCE CHINA-TECHNOLOGICAL SCIENCES》, vol. 61, no. 10, XP036606674, DOI: 10.1007/s11431-017-9299-3 * |
| 秦欢等: "磷酸铁锂电池包微短路诊断方法的研究", 《储能科学与技术》, vol. 10, no. 21 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116068441A (en) * | 2021-10-29 | 2023-05-05 | 北汽福田汽车股份有限公司 | Power battery internal short circuit early warning method and device and vehicle |
| CN116072990A (en) * | 2021-10-29 | 2023-05-05 | 北汽福田汽车股份有限公司 | Power battery internal short circuit early warning method and device and vehicle |
Also Published As
| Publication number | Publication date |
|---|---|
| CN116482551B (en) | 2024-03-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN116482551B (en) | Calibration method, measurement method, system, equipment and medium for short circuit in module | |
| CN113369176B (en) | Sorting method and system for recycling retired batteries | |
| US7888911B2 (en) | Method and system for determining the SOC of a rechargeable battery | |
| CN102944849A (en) | Rapid battery capacity detecting method for lithium ion batteries | |
| CN105510847A (en) | Method for screening consistency of lithium ion batteries | |
| CN102645635A (en) | Device and method for testing corresponding relation between open circuit voltage (OCV) and system on chip (SOC) | |
| CN105140996A (en) | Lithium ion battery pack equalization management system and equalization control method | |
| CN112285583B (en) | Method, device and system for testing maximum capacity of battery cell | |
| CN109078871B (en) | Rejection method of retired battery parallel module for echelon utilization | |
| CN106596124A (en) | Small-sized electric automobile power system testing platform | |
| CN110824367A (en) | Hardware-in-loop test system and method for new energy automobile battery management system | |
| CN111641241A (en) | Lithium battery pack power balanced distribution method and system | |
| CN111505521A (en) | Method for testing storage life of lithium secondary battery in accelerated manner | |
| Luan et al. | Influence of the connection topology on the performance of lithium-ion battery pack under cell-to-cell parameters variations | |
| CN108363016A (en) | Battery micro-short circuit quantitative Diagnosis method based on artificial neural network | |
| CN104681851A (en) | Method for matching lithium ion power batteries for automobiles | |
| CN103901353B (en) | Method for judging uniformity of all batteries of lithium ion battery pack and timing voltage measuring instrument | |
| WO2021077271A1 (en) | Charging method, electronic device, and storage medium | |
| CN112186278A (en) | Lithium ion battery matching method | |
| CN112379285B (en) | Battery pack self-discharge screening method | |
| CN116754981B (en) | Battery capacity prediction method and device, electronic equipment and storage medium | |
| CN111129628B (en) | Control method, system, medium and electronic equipment for lithium ion battery cell charge and discharge | |
| CN113484783A (en) | Battery SOH detection method, device, system, medium and program product | |
| CN111426966A (en) | Electric vehicle battery recombination method and device and electronic equipment | |
| CN117054892A (en) | Evaluation method, device and management method for battery state of energy storage power station |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |