CN116736118A - Battery pack detection method and system - Google Patents
Battery pack detection method and system Download PDFInfo
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- CN116736118A CN116736118A CN202310455416.1A CN202310455416A CN116736118A CN 116736118 A CN116736118 A CN 116736118A CN 202310455416 A CN202310455416 A CN 202310455416A CN 116736118 A CN116736118 A CN 116736118A
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- 238000001514 detection method Methods 0.000 title claims abstract description 48
- 238000001453 impedance spectrum Methods 0.000 claims abstract description 58
- 238000012360 testing method Methods 0.000 claims abstract description 49
- 238000000034 method Methods 0.000 claims abstract description 41
- 238000012545 processing Methods 0.000 claims description 27
- 239000003792 electrolyte Substances 0.000 claims description 7
- 230000005284 excitation Effects 0.000 claims description 7
- 238000004364 calculation method Methods 0.000 claims description 6
- 239000007772 electrode material Substances 0.000 claims description 6
- 238000012546 transfer Methods 0.000 claims description 6
- 238000010998 test method Methods 0.000 claims 1
- 230000001133 acceleration Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
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- 238000010586 diagram Methods 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/3644—Constructional arrangements
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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 relates to a battery pack detection method and a system, and relates to the technical field of battery detection, wherein the method comprises the following steps: after detecting that the battery pack to be tested is connected, issuing a charging instruction; the charging instruction is used for controlling a charging switch connected with the battery pack to be tested to be turned on so as to charge the battery pack to be tested; after the battery pack to be tested is fully charged and the balanced waiting time is passed, issuing a configuration instruction; the test instruction is used for connecting the battery pack to be tested with the impedance spectrum analyzer and setting the matching test parameters according to the type of the battery pack; the test parameters include frequency range, scan rate, and acceleration voltage; issuing a test instruction, applying alternating voltage to the battery pack to be tested, and recording a current response signal; calculating impedance amplitude and phase angle of the battery under different frequencies, and drawing an impedance spectrum; determining the state and performance of the battery based on the impedance spectrum and basic parameters of the battery pack to be tested; the basic parameters include internal resistance and capacity.
Description
Technical Field
The application relates to the technical field of battery pack detection, in particular to a battery pack detection method and system.
Background
The detection of the battery pack refers to the process of detecting and analyzing parameters such as the electric quantity, the voltage, the current and the like of the battery pack. In modern society, battery packs are widely used in various fields such as electric automobiles, aerospace, mobile power supplies, and the like. The performance of the battery pack plays a vital role in the stability, the service life, the efficiency and the like of the whole system, so that how to better and effectively detect the battery pack is a technical problem which needs to be solved in the industry.
Disclosure of Invention
In order to at least partially solve the above technical problems, the present application provides a method and a system for detecting a battery pack.
In a first aspect, the present application provides a battery pack detection method according to the following technical solution.
A battery pack detection method comprising:
after detecting that the battery pack to be tested is connected, issuing a charging instruction; the charging instruction is used for controlling a charging switch connected with the battery pack to be tested to be turned on so as to charge the battery pack to be tested;
after the battery pack to be tested is fully charged and the balanced waiting time is passed, issuing a configuration instruction; the test instruction is used for connecting the battery pack to be tested with the impedance spectrum analyzer and setting the matching test parameters according to the type of the battery pack; the test parameters comprise a frequency range, a scanning rate and an accelerating voltage;
issuing a test instruction, applying alternating voltage to the battery pack to be tested, and recording a current response signal;
calculating impedance amplitude and phase angle of the battery under different frequencies, and drawing an impedance spectrum; the method comprises the steps of,
determining the state and performance of the battery based on the impedance spectrum and basic parameters of the battery pack to be tested; the basic parameters include internal resistance and capacity.
Optionally, the method for acquiring the balance waiting time length includes:
judging whether the corresponding waiting time length is stored in the database or not based on the type information of the battery pack to be tested;
if yes, taking the waiting time saved in the database as the balanced waiting time;
if not, measuring the open circuit voltage V1 of the battery pack to be tested;
obtaining nominal charging time T1 based on rated capacity of the battery pack to be tested;
calculating the time T2 required by full charge of the battery pack to be tested according to the battery pack to be tested and the voltage level;
if the electric quantity of the battery pack to be tested is lower than a first threshold value; calculating a first waiting time length Tn1 according to tn1=t1-t1×v1/V0; wherein V0 is the nominal voltage of the battery pack to be tested;
if the electric quantity of the battery pack to be tested is not lower than a first threshold value; calculating a second waiting time length Tn2 according to tn2=t2-t1×v1/V0;
and selecting the larger one of the first waiting time and the second waiting time as the balanced waiting time.
Optionally, in the process of charging the battery pack to be tested, the method further includes:
sending a temperature detection starting instruction; the temperature detection starting instruction is used for controlling the starting of the temperature detector; the temperature detector is used for detecting temperature data of the battery pack;
receiving temperature data information sent by a temperature detector;
adjusting the magnitude of the charging current based on the temperature data information; wherein the method comprises the steps ofWherein the T is max Is the preset highest safe temperature; t (T) a Is the current temperature data; t (T) 0 Is the initial temperature of the battery pack; i is the original charging current; i c The adjusted charging current;
judging whether the current temperature data is greater than T max The method comprises the steps of carrying out a first treatment on the surface of the If yes, stopping charging the battery pack to be tested within the time period t; the calculation formula of the time t is as follows: t= (T a -T max ) K; wherein K corresponds to the type and performance parameters of the battery pack to be tested.
Optionally, the determining the state and the performance of the battery by the impedance spectrum and the basic parameters of the battery pack to be tested includes:
obtaining impedance spectrum data based on the impedance spectrum, wherein the impedance spectrum data comprises a real part impedance Z_r and an imaginary part impedance Z_i;
respectively normalizing Z_r and Z_i, and converting the Z_r and Z_i into a polar coordinate form to obtain a module length Z_a and a phase angle Z_p of impedance spectrum data;
determining r_ct and c_dl parameters in the battery based on z_a and z_p; r_ct is the charge transfer resistance between the electrode and the electrolyte; c_dl is the electrode double layer capacitance;
judging the state and performance of the battery based on the R_ct and C_dl parameters; wherein: if the R_ct value is greater than the nominal value to a first value, the electrode material in the battery is damaged or hyperpolarized; if the value of C_dl is greater than the nominal value to a second value, the electrode double layer capacitance is changed.
Optionally, determining r_ct and c_dl parameters in the battery based on z_a and z_p includes:
R_ct＝Z_a*cos(Z_p)；
c_dl= -1/(2pi fz_psin (z_p)); f is the excitation signal frequency. .
In a second aspect, the present application provides a battery pack detection system according to the following technical solution.
A battery pack detection system, comprising:
a first processing module for: after detecting that the battery pack to be tested is connected, issuing a charging instruction; the charging instruction is used for controlling a charging switch connected with the battery pack to be tested to be turned on so as to charge the battery pack to be tested;
a second processing module for: after the battery pack to be tested is fully charged and the balanced waiting time is passed, issuing a configuration instruction; the test instruction is used for connecting the battery pack to be tested with the impedance spectrum analyzer and setting the matching test parameters according to the type of the battery pack; the test parameters comprise a frequency range, a scanning rate and an accelerating voltage;
a third processing module for: issuing a test instruction, applying alternating voltage to the battery pack to be tested, and recording a current response signal;
a fourth processing module for: calculating impedance amplitude and phase angle of the battery under different frequencies, and drawing an impedance spectrum; the method comprises the steps of,
a fifth processing module for: determining the state and performance of the battery based on the impedance spectrum and basic parameters of the battery pack to be tested; the basic parameters include internal resistance and capacity.
Optionally, the method for acquiring the balance waiting time length includes:
judging whether the corresponding waiting time length is stored in the database or not based on the type information of the battery pack to be tested;
if yes, taking the waiting time saved in the database as the balanced waiting time;
if not, measuring the open circuit voltage V1 of the battery pack to be tested;
obtaining nominal charging time T1 based on rated capacity of the battery pack to be tested;
calculating the time T2 required by full charge of the battery pack to be tested according to the battery pack to be tested and the voltage level;
if the electric quantity of the battery pack to be tested is lower than a first threshold value; calculating a first waiting time length Tn1 according to tn1=t1-t1×v1/V0; wherein V0 is the nominal voltage of the battery pack to be tested;
if the electric quantity of the battery pack to be tested is not lower than a first threshold value; calculating a second waiting time length Tn2 according to tn2=t2-t1×v1/V0;
and selecting the larger one of the first waiting time and the second waiting time as the balanced waiting time.
Optionally, the system further comprises: a sixth processing module for:
sending a temperature detection starting instruction; the temperature detection starting instruction is used for controlling the starting of the temperature detector; the temperature detector is used for detecting temperature data of the battery pack;
receiving temperature data information sent by a temperature detector;
adjusting the magnitude of the charging current based on the temperature data information; wherein the method comprises the steps ofWherein the T is max Is the preset highest safe temperature; t (T) a Is the current temperature data; t (T) 0 Is the initial temperature of the battery pack; i is the original charging current; i c The adjusted charging current;
judging whether the current temperature data is greater than T max The method comprises the steps of carrying out a first treatment on the surface of the If yes, stopping charging the battery pack to be tested within the time period t; the calculation formula of the time t is as follows: t= (T a -T max ) K; wherein K is the same as the type and nature of the battery pack to be testedThe energy parameters correspond.
Optionally, the determining the state and the performance of the battery based on the impedance spectrum and the basic parameters of the battery pack to be tested includes:
obtaining impedance spectrum data based on the impedance spectrum, wherein the impedance spectrum data comprises a real part impedance Z_r and an imaginary part impedance Z_i;
respectively normalizing Z_r and Z_i, and converting the Z_r and Z_i into a polar coordinate form to obtain a module length Z_a and a phase angle Z_p of impedance spectrum data;
determining r_ct and c_dl parameters in the battery based on z_a and z_p; r_ct is the charge transfer resistance between the electrode and the electrolyte; c_dl is the electrode double layer capacitance;
judging the state and performance of the battery based on the R_ct and C_dl parameters; wherein: if the R_ct value is greater than the nominal value to a first value, the electrode material in the battery is damaged or hyperpolarized; if the value of C_dl is greater than the nominal value to a second value, the electrode double layer capacitance is changed.
Optionally, determining r_ct and c_dl parameters in the battery based on z_a and z_p includes:
R_ct＝Z_a*cos(Z_p)；
c_dl= -1/(2pi fz_psin (z_p)); f is the excitation signal frequency.
Drawings
FIG. 1 is a flow chart of a method for detecting a battery pack according to an embodiment of the present application;
FIG. 2 is a system block diagram of a battery pack detection system according to an embodiment of the present application;
in the figure, 101, a first processing module; 102. a second processing module; 103. a third processing module; 104. a fifth processing module; 105. a fifth processing module; 106. and a sixth processing module.
Detailed Description
The application is further illustrated by the following description of the embodiments in conjunction with the accompanying figures 1-2:
the embodiment of the application discloses a battery pack detection method. Referring to fig. 1, as one embodiment of a battery pack detection method, a battery pack detection method includes:
step 101, after detecting that the battery pack to be tested is connected, issuing a charging instruction; and the charging instruction is used for controlling a charging switch connected with the battery pack to be tested to be turned on so as to charge the battery pack to be tested.
Specifically, the detection device is provided with a plurality of connectors for being connected with the input and output interfaces of the battery pack, and after the worker finishes connecting the detection interfaces of the detection device with the interfaces corresponding to the battery pack, the processing unit (or the control unit) of the detection device detects that the battery pack to be detected is connected. In the charging process, the processing unit controls the charging of the battery by controlling the state of a charging switch, and the charging switch is normally turned on and off by a PWM (pulse width modulation) or SPWM (sinusoidal wave width modulation) mode. Therefore, the processing unit issues a charging instruction, and the charging instruction is used for controlling the charging switch to be opened so as to start charging the battery pack to be tested.
Step 102, after the battery pack to be tested is fully charged and the balance waiting time is elapsed, issuing a configuration instruction; the test instruction is used for connecting the battery pack to be tested with the impedance spectrum analyzer and setting the matching test parameters according to the type of the battery pack; the test parameters include frequency range, scan rate, acceleration voltage.
Specifically, before performing the battery pack test, the battery pack to be tested needs to be fully charged, and a balancing time elapses to ensure that the battery pack is in a stable state. The accuracy and reliability of the test results can be ensured by step 102, thereby providing necessary basic data for the subsequent test process. The test equipment automatically sets corresponding test parameters to match different kinds of battery packs. The test parameters include frequency range, scan rate, acceleration voltage, etc., which can be adjusted and modified for different types of battery packs. By automatically changing the test parameters, different types of battery packs can be tested and analyzed.
And 103, issuing a test instruction, applying alternating voltage to the battery pack to be tested, and recording a current response signal.
Specifically, the test device automatically configures parameters such as frequency and intensity of the applied alternating voltage according to the test parameters, and the application of voltages with different parameters can have different effects on the test result. During the test, the applied ac voltage may be in the form of a sine wave or square wave, or the like. An alternating voltage is applied to the battery pack to be tested, which generates a current response signal that is recorded by the test device. When different types of battery packs are subjected to the same alternating voltage, current response signals are different, and the signals reflect impedance spectrum characteristics formed by electrochemical reactions, structures and other factors inside the battery packs.
And 104, calculating the impedance amplitude and the phase angle of the battery at different frequencies, and drawing an impedance spectrum.
Specifically, the impedance amplitude and phase angle of the battery at different frequencies are calculated and the impedance spectrum is plotted. Impedance spectrum refers to a graph drawn from a curve of impedance mode and phase angle as a function of frequency. By analyzing the impedance spectrum, the chemical and physical characteristics of the battery can be deeply understood.
Step 105, determining the state and performance of the battery based on the impedance spectrum and the basic parameters of the battery pack to be tested; the basic parameters include internal resistance and capacity.
In particular, different spectral lines in the impedance spectrum correspond to the impedance of different components, such as electrolytes, electrodes, etc. By analyzing these spectral lines, key parameters of the battery, such as internal resistance and capacity, can be calculated while an appropriate equivalent circuit model is established. The internal resistance refers to the resistance of the battery to current during discharge, while the capacity refers to the amount of charge that the battery can store.
By adopting the technical scheme, the impedance spectrum analysis and the measurement of the basic parameters can be completed by connecting the battery pack to be tested and automatically issuing the simple charging and testing instructions by the testing equipment without disassembling the battery pack or using complex testing equipment. Meanwhile, the method is also suitable for different types of battery packs, corresponding test parameters can be matched according to the types of the battery packs, and the test efficiency and accuracy are improved. The method has the advantages of realizing a standardized test flow, improving the efficiency and accuracy of the battery pack test, being applicable to different types of battery packs and the like, and has important application value in the test and analysis of the battery packs.
As a specific embodiment of a battery pack detection method, a method for acquiring a balance waiting time length includes:
judging whether the corresponding waiting time length is stored in the database or not based on the type information of the battery pack to be tested;
if yes, taking the waiting time saved in the database as the balanced waiting time;
if not, measuring the open circuit voltage V1 of the battery pack to be tested;
obtaining nominal charging time T1 based on rated capacity of the battery pack to be tested;
calculating the time T2 required by full charge of the battery pack to be tested according to the battery pack to be tested and the voltage level;
if the electric quantity of the battery pack to be tested is lower than a first threshold value; calculating a first waiting time length Tn1 according to tn1=t1-t1×v1/V0; wherein V0 is the nominal voltage of the battery pack to be tested;
if the electric quantity of the battery pack to be tested is not lower than a first threshold value; calculating a second waiting time length Tn2 according to tn2=t2-t1×v1/V0;
and selecting the larger one of the first waiting time and the second waiting time as the balanced waiting time.
Specifically, by adopting the technical scheme, the balance waiting time length can be flexibly selected according to the characteristics and the electric quantity of the battery pack to be tested, so that a more accurate and efficient test effect is achieved.
As a specific embodiment of the method for detecting a battery pack, in the process of charging the battery pack to be detected, the method further includes:
sending a temperature detection starting instruction; the temperature detection starting instruction is used for controlling the starting of the temperature detector; the temperature detector is used for detecting temperature data of the battery pack;
receiving temperature data information sent by a temperature detector;
adjusting the magnitude of the charging current based on the temperature data information; wherein the method comprises the steps ofWherein the T is max Is the preset highest safe temperature; t (T) a Is the current temperature data; t (T) 0 Is the initial temperature of the battery pack; i is the original charging current; i c The adjusted charging current;
judging whether the current temperature data is greater than T max The method comprises the steps of carrying out a first treatment on the surface of the If yes, stopping charging the battery pack to be tested within the time period t; the calculation formula of the time t is as follows: t= (T a -T max ) K; wherein K corresponds to the type and performance parameters of the battery pack to be tested.
Specifically, the temperature detection and the temperature control in the charging process can effectively ensure the safety and the high efficiency of the charging process of the battery pack. When the temperature of the battery pack exceeds the safety range, the charging is stopped in time, and the safety problem caused by overheat of the battery pack can be avoided. In addition, by dynamically adjusting the magnitude of the charging current according to the temperature data, the charging process can be made more refined and efficient. .
As a specific embodiment of the battery pack detection method, the determining the state and the performance of the battery based on the impedance spectrum and the basic parameters of the battery pack to be detected includes:
obtaining impedance spectrum data based on the impedance spectrum, wherein the impedance spectrum data comprises a real part impedance Z_r and an imaginary part impedance Z_i;
respectively normalizing Z_r and Z_i, and converting the Z_r and Z_i into a polar coordinate form to obtain a module length Z_a and a phase angle Z_p of impedance spectrum data;
determining r_ct and c_dl parameters in the battery based on z_a and z_p; r_ct is the charge transfer resistance between the electrode and the electrolyte; c_dl is the electrode double layer capacitance;
judging the state and performance of the battery based on the R_ct and C_dl parameters; wherein: if the R_ct value is greater than the nominal value to a first value, the electrode material in the battery is damaged or hyperpolarized; if the value of C_dl is greater than the nominal value to a second value, the electrode double layer capacitance is changed.
As a specific embodiment of a battery pack detection method, determining r_ct and c_dl parameters in a battery based on z_a and z_p includes:
R_ct＝Z_a*cos(Z_p)；
c_dl= -1/(2pi fz_psin (z_p)); f is the excitation signal frequency.
In particular, the frequency of the excitation signal is set by the measuring device during the measurement, typically stepwise over a range, in order to obtain the whole impedance spectrum. Typically, the frequency ranges from 0.1Hz to 1 MHz. The lower the frequency, the more internal information of the battery can be detected.
The application also provides a battery pack detection system, which comprises: a first processing module for: after detecting that the battery pack to be tested is connected, issuing a charging instruction; the charging instruction is used for controlling a charging switch connected with the battery pack to be tested to be turned on so as to charge the battery pack to be tested;
a second processing module for: after the battery pack to be tested is fully charged and the balanced waiting time is passed, issuing a configuration instruction; the test instruction is used for connecting the battery pack to be tested with the impedance spectrum analyzer and setting the matching test parameters according to the type of the battery pack; the test parameters comprise a frequency range, a scanning rate and an accelerating voltage;
a third processing module for: issuing a test instruction, applying alternating voltage to the battery pack to be tested, and recording a current response signal;
a fourth processing module for: calculating impedance amplitude and phase angle of the battery under different frequencies, and drawing an impedance spectrum; the method comprises the steps of,
a fifth processing module for: determining the state and performance of the battery based on the impedance spectrum and basic parameters of the battery pack to be tested; the basic parameters include internal resistance and capacity.
As a specific embodiment of a battery pack detection system, a method for acquiring a balance waiting time length includes:
judging whether the corresponding waiting time length is stored in the database or not based on the type information of the battery pack to be tested;
if yes, taking the waiting time saved in the database as the balanced waiting time;
if not, measuring the open circuit voltage V1 of the battery pack to be tested;
obtaining nominal charging time T1 based on rated capacity of the battery pack to be tested;
calculating the time T2 required by full charge of the battery pack to be tested according to the battery pack to be tested and the voltage level;
if the electric quantity of the battery pack to be tested is lower than a first threshold value; calculating a first waiting time length Tn1 according to tn1=t1-t1×v1/V0; wherein V0 is the nominal voltage of the battery pack to be tested;
if the electric quantity of the battery pack to be tested is not lower than a first threshold value; calculating a second waiting time length Tn2 according to tn2=t2-t1×v1/V0;
and selecting the larger one of the first waiting time and the second waiting time as the balanced waiting time.
As a specific embodiment of a battery pack detection system, the system further comprises: a sixth processing module for:
sending a temperature detection starting instruction; the temperature detection starting instruction is used for controlling the starting of the temperature detector; the temperature detector is used for detecting temperature data of the battery pack;
receiving temperature data information sent by a temperature detector;
adjusting the magnitude of the charging current based on the temperature data information; wherein the method comprises the steps ofWherein the T is max Is the preset highest safe temperature; t (T) a Is the current temperature data; t (T) 0 Is the initial temperature of the battery pack; i is the original charging current; i c The adjusted charging current;
judging whether the current temperature data is greater than T max The method comprises the steps of carrying out a first treatment on the surface of the If yes, stopping charging the battery pack to be tested within the time period t; the calculation formula of the time t is as follows: t= (T a -T max ) K; wherein K corresponds to the type and performance parameters of the battery pack to be tested.
As a specific embodiment of the battery pack detection system, the determining the state and the performance of the battery based on the impedance spectrum and the basic parameters of the battery pack to be detected includes:
obtaining impedance spectrum data based on the impedance spectrum, wherein the impedance spectrum data comprises a real part impedance Z_r and an imaginary part impedance Z_i;
respectively normalizing Z_r and Z_i, and converting the Z_r and Z_i into a polar coordinate form to obtain a module length Z_a and a phase angle Z_p of impedance spectrum data;
determining r_ct and c_dl parameters in the battery based on z_a and z_p; r_ct is the charge transfer resistance between the electrode and the electrolyte; c_dl is the electrode double layer capacitance;
judging the state and performance of the battery based on the R_ct and C_dl parameters; wherein: if the R_ct value is greater than the nominal value to a first value, the electrode material in the battery is damaged or hyperpolarized; if the value of C_dl is greater than the nominal value to a second value, the electrode double layer capacitance is changed.
As a specific embodiment of a battery pack detection system, determining r_ct and c_dl parameters in a battery based on z_a and z_p, comprises:
R_ct＝Z_a*cos(Z_p)；
c_dl= -1/(2pi fz_psin (z_p)); f is the excitation signal frequency.
It should be noted that: the above embodiments are only for illustrating the present application and not for limiting the technical solutions described in the present application, and although the present application has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that the present application may be modified or substituted by the same, and all the technical solutions and modifications thereof without departing from the spirit and scope of the present application are intended to be included in the scope of the claims of the present application.
Claims (10)
1. A battery pack detection method, comprising:
after detecting that the battery pack to be tested is connected, issuing a charging instruction; the charging instruction is used for controlling a charging switch connected with the battery pack to be tested to be turned on so as to charge the battery pack to be tested;
after the battery pack to be tested is fully charged and the balanced waiting time is passed, issuing a configuration instruction; the test instruction is used for connecting the battery pack to be tested with the impedance spectrum analyzer and setting the matching test parameters according to the type of the battery pack; the test parameters comprise a frequency range, a scanning rate and an accelerating voltage;
issuing a test instruction, applying alternating voltage to the battery pack to be tested, and recording a current response signal;
calculating impedance amplitude and phase angle of the battery under different frequencies, and drawing an impedance spectrum; the method comprises the steps of,
determining the state and performance of the battery based on the impedance spectrum and basic parameters of the battery pack to be tested; the basic parameters include internal resistance and capacity.
2. The battery pack detection method according to claim 1, wherein the method for acquiring the balance waiting time period includes:
judging whether the corresponding waiting time length is stored in the database or not based on the type information of the battery pack to be tested;
if yes, taking the waiting time saved in the database as the balanced waiting time;
if not, measuring the open circuit voltage V1 of the battery pack to be tested;
obtaining nominal charging time T1 based on rated capacity of the battery pack to be tested;
calculating the time T2 required by full charge of the battery pack to be tested according to the battery pack to be tested and the voltage level;
if the electric quantity of the battery pack to be tested is lower than a first threshold value; calculating a first waiting time length Tn1 according to tn1=t1-t1×v1/V0; wherein V0 is the nominal voltage of the battery pack to be tested;
if the electric quantity of the battery pack to be tested is not lower than a first threshold value; calculating a second waiting time length Tn2 according to tn2=t2-t1×v1/V0;
and selecting the larger one of the first waiting time and the second waiting time as the balanced waiting time.
3. The method according to claim 2, wherein during the process of charging the battery pack to be tested, further comprising:
sending a temperature detection starting instruction; the temperature detection starting instruction is used for controlling the starting of the temperature detector; the temperature detector is used for detecting temperature data of the battery pack;
receiving temperature data information sent by a temperature detector;
adjusting the magnitude of the charging current based on the temperature data information; wherein the method comprises the steps ofWherein the T is max Is the preset highest safe temperature; t (T) a Is the current temperature data; t (T) 0 Is the initial temperature of the battery pack; i is the original charging current; i c The adjusted charging current;
judging whether the current temperature data is greater than T max The method comprises the steps of carrying out a first treatment on the surface of the If yes, stopping charging the battery pack to be tested within the time period t; the calculation formula of the time t is as follows: t= (T a -T max ) K; wherein K corresponds to the type and performance parameters of the battery pack to be tested.
4. A method of testing a battery pack according to claim 3, wherein said determining the state and performance of the battery based on the impedance spectrum and the basic parameters of the battery pack to be tested comprises:
obtaining impedance spectrum data based on the impedance spectrum, wherein the impedance spectrum data comprises a real part impedance Z_r and an imaginary part impedance Z_i;
respectively normalizing Z_r and Z_i, and converting the Z_r and Z_i into a polar coordinate form to obtain a module length Z_a and a phase angle Z_p of impedance spectrum data;
determining r_ct and c_dl parameters in the battery based on z_a and z_p; r_ct is the charge transfer resistance between the electrode and the electrolyte; c_dl is the electrode double layer capacitance;
judging the state and performance of the battery based on the R_ct and C_dl parameters; wherein: if the R_ct value is greater than the nominal value to a first value, the electrode material in the battery is damaged or hyperpolarized; if the value of C_dl is greater than the nominal value to a second value, the electrode double layer capacitance is changed.
5. The battery pack detection method according to claim 4, wherein determining r_ct and c_dl parameters in the battery based on z_a and z_p comprises:
R_ct＝Z_a*cos(Z_p)；
c_dl= -1/(2pi fz_psin (z_p)); f is the excitation signal frequency.
6. A battery pack detection system, comprising:
a first processing module for: after detecting that the battery pack to be tested is connected, issuing a charging instruction; the charging instruction is used for controlling a charging switch connected with the battery pack to be tested to be turned on so as to charge the battery pack to be tested;
a second processing module for: after the battery pack to be tested is fully charged and the balanced waiting time is passed, issuing a configuration instruction; the test instruction is used for connecting the battery pack to be tested with the impedance spectrum analyzer and setting the matching test parameters according to the type of the battery pack; the test parameters comprise a frequency range, a scanning rate and an accelerating voltage;
a third processing module for: issuing a test instruction, applying alternating voltage to the battery pack to be tested, and recording a current response signal;
a fourth processing module for: calculating impedance amplitude and phase angle of the battery under different frequencies, and drawing an impedance spectrum; the method comprises the steps of,
a fifth processing module for: determining the state and performance of the battery based on the impedance spectrum and basic parameters of the battery pack to be tested; the basic parameters include internal resistance and capacity.
7. The battery pack detection system according to claim 6, wherein the method for acquiring the balance waiting time period includes:
judging whether the corresponding waiting time length is stored in the database or not based on the type information of the battery pack to be tested;
if yes, taking the waiting time saved in the database as the balanced waiting time;
if not, measuring the open circuit voltage V1 of the battery pack to be tested;
obtaining nominal charging time T1 based on rated capacity of the battery pack to be tested;
calculating the time T2 required by full charge of the battery pack to be tested according to the battery pack to be tested and the voltage level;
if the electric quantity of the battery pack to be tested is lower than a first threshold value; calculating a first waiting time length Tn1 according to tn1=t1-t1×v1/V0; wherein V0 is the nominal voltage of the battery pack to be tested;
if the electric quantity of the battery pack to be tested is not lower than a first threshold value; calculating a second waiting time length Tn2 according to tn2=t2-t1×v1/V0;
and selecting the larger one of the first waiting time and the second waiting time as the balanced waiting time.
8. The battery pack detection system of claim 7, wherein the system further comprises: a sixth processing module for:
sending a temperature detection starting instruction; the temperature detection starting instruction is used for controlling the starting of the temperature detector; the temperature detector is used for detecting temperature data of the battery pack;
receiving temperature data information sent by a temperature detector;
adjusting the magnitude of the charging current based on the temperature data information; wherein the method comprises the steps ofWherein the T is max Is the preset highest safe temperature; t (T) a Is the current temperature data; t (T) 0 Is the initial temperature of the battery pack; i is the original charging current; i c The adjusted charging current;
judging whether the current temperature data is greater than T max The method comprises the steps of carrying out a first treatment on the surface of the If yes, stopping charging the battery pack to be tested within the time period t; the calculation formula of the time t is as follows: t= (T a -T max ) K; wherein K corresponds to the type and performance parameters of the battery pack to be tested.
9. The battery pack detection system of claim 8, wherein the determining the state and performance of the battery based on the impedance spectrum and the basic parameters of the battery pack to be tested comprises:
obtaining impedance spectrum data based on the impedance spectrum, wherein the impedance spectrum data comprises a real part impedance Z_r and an imaginary part impedance Z_i;
respectively normalizing Z_r and Z_i, and converting the Z_r and Z_i into a polar coordinate form to obtain a module length Z_a and a phase angle Z_p of impedance spectrum data;
determining r_ct and c_dl parameters in the battery based on z_a and z_p; r_ct is the charge transfer resistance between the electrode and the electrolyte; c_dl is the electrode double layer capacitance;
judging the state and performance of the battery based on the R_ct and C_dl parameters; wherein: if the R_ct value is greater than the nominal value to a first value, the electrode material in the battery is damaged or hyperpolarized; if the value of C_dl is greater than the nominal value to a second value, the electrode double layer capacitance is changed.
10. The battery pack detection system of claim 9, wherein determining r_ct and c_dl parameters in the battery based on z_a and z_p comprises:
R_ct＝Z_a*cos(Z_p)；
c_dl= -1/(2pi fz_psin (z_p)); f is the excitation signal frequency.
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