CN114487852A - Power battery complementary energy detection method and device, computer equipment and storage medium - Google Patents
Power battery complementary energy detection method and device, computer equipment and storage medium Download PDFInfo
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Abstract
The invention relates to a method, a device, computer equipment and a storage medium for detecting the residual energy of a power battery, which are used for improving the capacity detection efficiency of the power battery on the premise of ensuring the residual capacity test accuracy of the power battery by acquiring the working parameter information of the power battery, testing the temperature of the power battery under the preset temperature condition to acquire the temperature information of the power battery when the working parameter information of the power battery meets the parameter threshold condition, acquiring the discharge information of the power battery under the preset discharge condition when the temperature information meets the temperature threshold condition, and acquiring the residual capacity information of the power battery under the preset charge-discharge cycle condition when the discharge information meets the pressure difference threshold condition.
Description
Technical Field
The invention relates to the technical field of battery evaluation, in particular to a method and a device for detecting the complementary energy of a power battery, computer equipment and a storage medium.
Background
In recent years, as the energy crisis of China is deepened, the environmental awareness of the people is strengthened, and the new energy automobile industry is rapidly developed under the stimulation of government policy subsidy and the like. Under the background that the technology of the hybrid electric vehicle is gradually mature and the cost of the power battery is gradually reduced, the rapid development of the new energy vehicle also enables the output of the power battery to be continuously increased. According to the international universal standard, in order to ensure the driving range and safe operation, the automobile battery must be replaced when 80% of capacity remains, so that the retired electric automobile battery is also increased explosively.
In order to promote the ex-service power battery in China to realize echelon utilization, the detection of the ex-service power battery from the aspects of a single body, a module, the power battery, a battery system and the like is urgently needed to be established and perfected, and a reliable basis is provided for the detection and the recycling of the residual energy of the ex-service power battery of the electric automobile.
Disclosure of Invention
In view of the above, it is necessary to provide a method and an apparatus for detecting remaining energy of a power battery, a computer device, and a storage medium.
A power battery complementary energy detection method comprises the following steps:
acquiring working parameter information of the power battery;
when the working parameter information of the power battery meets a parameter threshold condition, carrying out temperature test on the power battery under a preset temperature condition to obtain the temperature information of the power battery;
when the temperature information meets the temperature threshold condition, acquiring the discharge information of the power battery under a preset discharge condition;
and when the discharge information meets the pressure difference threshold condition, acquiring the residual capacity information of the power battery under the preset charge-discharge cycle condition.
In one embodiment, the operating parameter information includes a measured resistance value and a measured voltage value, and the parameter threshold condition includes a resistance threshold condition and a voltage threshold condition;
when the working parameter information of the power battery meets the parameter threshold condition, the temperature of the power battery is tested under the preset temperature condition to obtain the temperature information of the power battery, and the method comprises the following steps:
when the measured resistance value of the power battery meets the resistance threshold value condition, performing voltage test on the power battery to obtain a measured voltage value of the power battery;
and when the measured voltage value of the power battery meets the voltage threshold condition, carrying out temperature test on the power battery under a preset temperature condition to obtain the temperature information of the power battery.
In one embodiment, the resistance threshold condition includes that a ratio of the measured resistance value to a preset resistance threshold value is smaller than a specific value; and/or
The voltage threshold condition includes that the measured voltage value is not less than a preset voltage threshold.
In one embodiment, the discharge information comprises a discharge pressure difference and a storage pressure difference, and the pressure difference threshold condition comprises a discharge pressure difference threshold condition and a storage pressure difference threshold condition;
when the discharge information meets the pressure difference threshold condition, acquiring the residual capacity information of the power battery under the preset charge-discharge cycle condition, wherein the residual capacity information comprises:
when the discharge pressure difference of the power battery meets the discharge pressure difference threshold condition, performing a storage pressure difference test on the power battery to obtain the storage pressure difference of the power battery;
and when the storage pressure difference of the power battery meets the storage pressure difference threshold condition, carrying out residual capacity test on the power battery to obtain residual capacity information of the power battery under a preset charge-discharge cycle condition.
In one embodiment, the discharge voltage difference threshold condition includes that the discharge voltage difference is smaller than the discharge voltage difference preset threshold; and/or
The stored pressure differential threshold condition includes the stored pressure differential being less than the stored pressure differential preset threshold.
In one embodiment, the method further comprises the following steps:
carrying out cycle life test on the power battery according to the residual capacity information to obtain the cycle of the residual cycle life;
and when the period is greater than a period threshold value, determining that the power battery meets the recovery condition.
In one embodiment, the obtaining the remaining capacity information of the power battery under the preset charge-discharge cycle condition when the discharge information meets the pressure difference threshold condition includes:
when the discharge information meets a pressure difference threshold condition, carrying out a charge-discharge cycle capacity test on the power battery according to a preset charge-discharge multiplying power so as to obtain the residual capacity information of the power battery; wherein the preset charge-discharge multiplying power comprises 0.5C charge-discharge multiplying power and 1C charge-discharge multiplying power.
A power battery complementary energy detection device comprises:
the working parameter information module is used for acquiring the working parameter information of the power battery;
the temperature information module is used for testing the temperature of the power battery under a preset temperature condition to acquire the temperature information of the power battery when the working parameter information of the power battery meets a parameter threshold condition;
the discharging information module is used for acquiring discharging information of the power battery under a preset discharging condition when the temperature information meets a temperature threshold condition;
and the capacity information module is used for acquiring the residual capacity information of the power battery under the preset charging and discharging cycle condition when the discharging information meets the pressure difference threshold condition.
A computer device comprising a memory and a processor, the memory having stored therein a computer program which, when executed by the processor, causes the processor to carry out the steps of the method as described above.
A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method as described above.
According to the method, the device, the computer equipment and the storage medium for detecting the residual energy of the power battery, the working parameter information of the power battery is obtained, when the working parameter information of the power battery meets the parameter threshold condition, the temperature of the power battery is tested under the preset temperature condition to obtain the temperature information of the power battery, when the temperature information meets the temperature threshold condition, the discharge information of the power battery is obtained under the preset discharge condition, and when the discharge information meets the pressure difference threshold condition, the residual capacity information of the power battery under the preset charge-discharge cycle condition is obtained, so that the capacity detection efficiency of the power battery is improved on the premise of ensuring the residual capacity testing accuracy of the power battery.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of a method for detecting remaining energy of a power battery according to an embodiment;
FIG. 2 is a power cell case temperature versus discharge rate graph according to one embodiment;
FIG. 3 is a discharge heat cycle curve of a power battery at different discharge rates according to an embodiment;
FIG. 4 is a flowchart illustrating steps detailed in step 104 according to one embodiment;
FIG. 5 is a flowchart illustrating the detailed steps of step 108 in one embodiment;
FIG. 6 is a flow chart of a power battery remaining energy detection method according to an embodiment;
FIG. 7 is a graph of power battery capacity retention versus cycle life cycle for one embodiment;
FIG. 8 is a discharge capacity curve of battery 1C before and after 10 cycles at charge-discharge rate in one example;
FIG. 9 is a block diagram of a power battery remaining energy detection device according to an embodiment;
fig. 10 is a block diagram of a power battery remaining energy detection device in one embodiment.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Embodiments of the present application are set forth in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. Also, as used in this specification, the term "and/or" includes any and all combinations of the associated listed items.
Referring to fig. 1, a flowchart of a method for detecting remaining energy of a power battery according to an embodiment is shown. As shown in fig. 1, the method for detecting the remaining energy of the power battery includes steps 102 to 108.
And 102, acquiring the working parameter information of the power battery.
Optionally, the operating parameter information of the power battery includes an actual resistance measurement value and an actual voltage measurement value of the power battery. The lithium battery is the most common power battery in daily use, and the resistance, namely the internal resistance of the battery, is divided into ohmic internal resistance and polarization internal resistance, wherein the ohmic internal resistance consists of an electrode material, electrolyte, a diaphragm resistor and contact resistances of parts; polarization internal resistance refers to resistance caused by polarization during electrochemical reaction, including resistance caused by electrochemical polarization and concentration polarization. In the normal use process of the battery, the higher the internal resistance of the battery is, the higher the temperature of the battery is caused, so that the discharge working voltage of the battery is reduced, the discharge time is shortened, and the performance, the service life and the like of the battery are seriously influenced. Therefore, the measured value of the resistance of the power battery is one of important technical indexes for measuring the performance of the battery, and the resistance test for the power battery is also an important test link in the detection process of the residual energy of the power battery.
And the voltage of the power battery is used as an important expression parameter of the battery state. The voltage operation parameters of a normal lithium battery need to be kept within a certain value range, and when the voltage of the battery exceeds the range, the battery is in an abnormal state. Therefore, the voltage measured value of the power battery is one of important technical indexes for measuring the performance of the battery, and the voltage test for the power battery is also an important test link in the residual energy detection process of the power battery.
And 104, when the working parameter information of the power battery meets the parameter threshold condition, carrying out temperature test on the power battery under the preset temperature condition to obtain the temperature information of the power battery.
Optionally, the temperature information of the power battery refers to discharging temperature rise information of the power battery under a preset temperature condition. Specifically, taking a lithium battery as an example, the temperature rise has an influence on both the calendar life and the cycle life of the lithium battery, the influence of the temperature on the life of the lithium battery conforms to the arrhenius equation, the temperature rise of the lithium battery increases the reaction speed, and related researches show that the degradation speed of the lithium battery increases by 1 time when the temperature of the lithium battery rises by 10 ℃. Therefore, the discharge temperature rise information of the power battery is one of important technical indexes for measuring the performance of the power battery, and the discharge temperature rise information test for the power battery is also an important test link in the residual energy detection process of the power battery.
And 106, when the temperature information meets the temperature threshold condition, acquiring the discharge information of the power battery under a preset discharge condition.
Optionally, the discharge information of the power battery includes a charge-discharge terminal pressure difference and self-discharge information under a preset discharge condition of the power battery. And (3) starting a Battery Management System (BMS) data acquisition function of the power Battery while testing the complementary energy of the power Battery, acquiring data of the voltage of the power Battery at the last stage of charging and discharging, and evaluating the consistency of the power Battery. The inconsistency of the capacity states of the monomers in the power battery can lead the power battery to age in an accelerated manner in the using process, so that the capacity of the whole power battery is attenuated in an accelerated manner in the circulating process, and the circulating life of the power battery is shortened. Therefore, the pressure difference at the last stage of charging and discharging of the power battery is one of important technical indexes for measuring the performance of the power battery, and the pressure difference test at the last stage of charging and discharging of the power battery is also an important test link in the residual energy detection process of the power battery.
Optionally, the self-discharge rate of the power battery is also called charge retention capacity, which is the retention capacity of the battery under certain environmental conditions when the battery is in an open circuit state. When the power batteries are initially assembled, the self-discharge performance of each single battery in the power batteries is consistent, but the aging degree of each single battery presents certain difference along with the use and operation of the power batteries, and the self-discharge performance of the power batteries also presents certain difference at the moment. Therefore, the self-discharge performance of the power battery needs to be evaluated secondarily, and in the evaluation process, the evaluation efficiency can be effectively improved by using a low-charge state storage evaluation mode, and meanwhile, the self-loss of the battery performance in the performance evaluation process is reduced. The most common method for testing the self-discharge rate of the battery is to measure the electric quantity of the battery before and after the battery is placed, so as to obtain a ratio as the self-discharge rate.
And step 108, when the discharge information meets the pressure difference threshold condition, acquiring the residual capacity information of the power battery under the preset charge-discharge cycle condition.
Optionally, the method for obtaining the residual capacity information of the power battery under the preset charge-discharge cycle condition includes performing a charge-discharge cycle capacity test on the power battery according to a preset charge-discharge rate to obtain the residual capacity information of the power battery. The preset charging and discharging multiplying power comprises 0.5C charging and discharging multiplying power and 1C charging and discharging multiplying power, and the method for detecting the residual capacity of the power battery through the 0.5C charging and discharging multiplying power and the 1C charging and discharging multiplying power respectively corresponds to the I2 capacity detection method and the I1 capacity detection method.
Wherein I2 indicates the current of the power battery charging and discharging for 2h, and the I2 capacity is equal to 0.5C discharge capacity; i1 capacity: referring to the current at 1h of discharge, the I1 capacity is equal to the 1C capacity value. Capacity is used to indicate the amount of electrical energy that a battery can store, and is generally indicated by the capital letter C in ampere-hours (Ah) or milliampere-hours (mAh). The initial capacity of the battery is the capacity (Ah) discharged when the battery newly shipped at room temperature is discharged to the discharge termination condition specified by the battery manufacturer at a rate of 1C after being fully charged, and the rated capacity of the battery is the capacity (Ah) discharged when the battery is discharged to the termination voltage at a rate of 1C after being fully charged at room temperature. The rated capacity of the battery is reduced along with the aging of the battery, the ratio of the rated capacity to the initial capacity can be used as an indicator of the health state of the battery, and the capacity of the retired battery is obviously reduced compared with the rated capacity at the time of factory shipment.
Using a power battery testing system at room temperature to perform 0.2C charging/0.2C discharging, 0.5C charging/0.5C discharging and 1.0C charging/1.0C discharging capacity tests on the power battery, wherein 0.2C charging/0.2C discharging represents that the power battery is charged according to 0.2C multiplying power and discharged according to 0.2C multiplying power; analyzing the capacity test data to know that: when the power battery is discharged at three multiplying powers of 0.2C/0.5C/1.0C, the discharge voltage platform is gradually reduced along with the increase of discharge current, because the polarization internal resistance of the battery is increased along with the increase of the discharge current, and the discharge voltage platform of the battery is reduced; at the same time, the capacity of the battery at the final discharge stage is similar under three different discharge currents. Thus, it is shown that the final discharged capacity of the battery at the end of discharge is not significantly different, but only in the range of 2% at different current discharges.
Fig. 2 is a graph showing the relationship between the temperature of the power battery case and the discharge rate in one embodiment. Taking a lithium battery as an example, as shown in fig. 2, the discharge temperature rise of the lithium battery under different discharge rates increases with the increase of the discharge rate, and the discharge temperature rise is significantly affected by the different discharge rates. As shown in table 1, a data table of battery case temperature and temperature rise in a power battery is shown.
TABLE 1 Power battery cell case temperature and temperature rise data sheet
As shown in Table 1, at a discharge rate of 0.1C/0.2C, the temperature rise of the battery during discharge is small, the maximum temperature of the shell is 36.5 ℃, and the battery is in a normal charge-discharge state. Under the discharge rate of 0.5C, the temperature rise of the battery shell is increased by 5 ℃ compared with 0.2C in the discharge process, the highest temperature is 40.8 ℃, and the battery is still in a normal charge-discharge state. Under the condition of 1℃ multiplying power, the temperature rise of the battery is obviously increased in the discharging process compared with 0.5C, reaches 25.9 ℃ compared with the initial undischarged state of the battery, the highest temperature of the battery also reaches 49.1 ℃, and the battery is already in a high-temperature charging and discharging environment. When the discharge multiplying power is increased to 1.5-2C, the discharge temperature rise of the battery is increased to be higher, and the temperature rise reaches more than 40 ℃. At 2C discharge rate, the maximum temperature reached 71.3 ℃ at the end of the cell discharge, which accelerated cell aging and was not recommended.
Fig. 3 is a discharge heat cycle relationship curve of the power battery under different discharge rates according to an embodiment. As shown in fig. 3, there is a significant correlation between the discharge rate and the discharge energy and heat of the battery, and the battery emits less energy at a high rate, generates more heat, and has an accelerated aging rate and a reduced service life.
According to the analysis, the discharge temperature rise of the lithium ion battery has a direct relation with the discharge multiplying power, and the discharge at a lower multiplying power does not cause high temperature rise. However, too high discharge rate may bring about very serious discharge temperature rise, which may directly exceed the maximum working temperature of the battery, and may adversely affect the power battery. The method combines the test efficiency of the design current and the complementary energy detection of the power battery of the electric automobile and the test result of the multiplying power temperature rise of the power battery, and is most effective in capacity screening at 0.5-1C multiplying power, namely the I2 discharge capacity or I1 discharge capacity of the power battery is used for representing the residual capacity of the power battery, compared with the method that the I5 discharge capacity represents the residual capacity of the power battery, the test time can be shortened to 4h/2h from 10h, the test efficiency of the battery pack is improved by 250%/500%, and the productivity and the yield are greatly improved.
According to the method for detecting the residual energy of the power battery, by acquiring the working parameter information of the power battery, when the working parameter information of the power battery meets a parameter threshold condition, a temperature test is performed on the power battery under a preset temperature condition to acquire the temperature information of the power battery, when the temperature information meets the temperature threshold condition, discharge information of the power battery is acquired under a preset discharge condition, and when the discharge information meets a pressure difference threshold condition, residual capacity information of the power battery under a preset charge-discharge cycle condition is acquired, so that the capacity detection efficiency of the power battery is improved on the premise of ensuring the accuracy of the residual capacity test of the power battery.
Referring to FIG. 4, a flowchart illustrating steps of step 104 according to an embodiment is shown. In this embodiment, the operation information of the power battery includes a measured resistance value and a measured voltage value of the power battery; the parametric threshold conditions include a resistance threshold condition and a voltage threshold condition. As shown in fig. 4, step 104 includes steps 402 through 404.
In step 404, when the voltage measured value of the power battery meets the voltage threshold condition, a temperature test is performed on the power battery under a preset temperature condition to obtain the temperature measured value of the power battery.
Optionally, the resistance threshold condition includes that a ratio of the measured resistance value to a preset resistance threshold value is smaller than a specific value; and/or the voltage threshold condition comprises that the measured voltage value is not less than the preset voltage threshold value.
Specifically, the resistance threshold condition includes comparing the size relationship between the battery actually-measured internal resistance value and the battery calibration internal resistance value, i.e. the resistance preset threshold; if the ratio of the actually measured internal resistance value of the battery to the calibrated internal resistance value of the battery is less than 130%, namely the actually measured internal resistance value of the battery is not more than 1.3 times of the calibrated internal resistance value of the battery, the battery can be subjected to subsequent complementary energy tests; if the ratio of the actual internal resistance value of the battery to the calibrated internal resistance value of the battery is not less than 130%, the actual internal resistance value of the battery is too large, the battery is seriously aged, subsequent complementary energy tests are not needed, and the battery can be directly disassembled and recycled.
Specifically, the voltage threshold condition includes comparing a magnitude relation between a battery measured voltage value and a voltage preset threshold; if the actually measured voltage value of the battery is not smaller than the preset voltage threshold value, the battery can be subjected to subsequent complementary energy testing. Taking a lithium battery as an example, the voltage range of a normal lithium battery is between 2.5V and 3.65V, i.e. the preset voltage threshold of the lithium battery is 2.5V. When the voltage of the battery exceeds the interval, the battery is in an abnormal state; when the voltage of the battery is lower than 2.5V, the battery is in an over-discharge state. When the battery is over-discharged, side reactions of the battery electrolyte, the negative electrode and the positive electrode are increased, the aging degree of the battery is increased, the capacity retention rate of the battery is reduced, and the service life is quickly attenuated when the battery is subsequently and normally used again. Therefore, when the voltage of the battery is lower than 2.5V, the battery is seriously aged, a subsequent complementary energy test is not required, and the battery can be directly disassembled and recycled; when the voltage of the battery is between 2.5V and 3.65V, the battery can be subjected to complementary energy test.
In one embodiment, the power battery complementary energy detection method further comprises the step of performing a temperature test on the power battery under a preset temperature condition to acquire temperature information of the power battery when the operating parameter information of the power battery meets a parameter threshold condition.
Optionally, the preset temperature condition may be that the battery monomer is charged to 3.65V at a charging rate of 1C at 25 ℃, then the battery monomer is kept standing for 1h, then the battery monomer is discharged to 2.5V at a discharging rate of 1C, and the temperature rise Δ T of the battery monomer in the charging and discharging process is recorded; if the temperature rise delta T is less than 20 ℃, carrying out complementary energy test on the battery; if the temperature rise is not less than 20 ℃, the battery is seriously aged and needs to be disassembled and recycled.
Referring to FIG. 5, a flowchart illustrating steps of step 108 is shown. In this embodiment, the discharge information of the power battery includes a discharge voltage difference and a storage voltage difference, and the voltage difference threshold condition of the power battery includes a voltage difference threshold condition and a storage voltage difference threshold condition. As shown in fig. 5, step 108 includes steps 502 through 504.
Optionally, the discharge voltage difference threshold condition includes that the discharge voltage difference is smaller than a preset discharge voltage difference threshold; and/or the stored pressure differential threshold condition comprises the stored pressure differential being less than a stored pressure differential preset threshold.
The discharge pressure difference refers to the pressure difference at the last stage of discharge of the power battery, and the value of the pressure difference at the last stage of discharge is a parameter index of consistency of the power battery. For example, as is clear from the technical requirements and inspection specifications of the Q/ZTT 2235.2-2019 lithium battery module (integrated type), the end-to-end voltage difference between the single batteries at the end of the discharge of the battery module is not more than 300 mV. When the pressure difference at the last stage of discharge is more than 300mV, the voltage consistency of some batteries in the power battery is poor, namely the capacity consistency of the batteries is poor, and the low-capacity battery is in an over-discharge state in the subsequent use process of the power battery. When the battery is over-discharged, the aging and attenuation of the battery are serious, and the residual cycle life is greatly reduced. Therefore, when the pressure difference of the power battery at the last stage of discharge is more than 300mV, the consistency of each single battery in the power battery is poor, and the battery needs to be disassembled and recycled.
The storage voltage difference refers to a voltage difference after the power battery is stored for a long time under a low SOC (state of charge), for example, a battery voltage change value stored for 3 days at a 5% SOC, and refers to a voltage change difference after the power battery is left to be stored for three days when the state of charge is five percent. In the actual use process, along with the use and the operation of the power battery, the aging degree of the single batteries presents certain difference, and at the moment, the self-discharge performance of the power battery also presents certain difference. Therefore, the self-discharge performance of the power battery needs to be evaluated secondarily, and in the evaluation process, the evaluation efficiency can be effectively improved by using a low-charge state storage evaluation mode, and meanwhile, the self-loss of the battery performance in the performance evaluation process is reduced. When the 5% SOC is used for storing for 3 days, the condition test shows that the self-discharge of the battery is large when the battery differential pressure exceeds 50mV, and the power battery needs to be disassembled and recycled. When the voltage difference of the battery is less than 50mV, the self-discharge consistency of the power battery is good, and the cycle performance evaluation can be carried out.
Referring to fig. 6, a flowchart of a method for detecting the remaining energy of the power battery in one embodiment is shown. As shown in fig. 6, the method for detecting remaining energy of power battery further includes steps 602 to 604.
And step 602, performing a cycle life test on the power battery according to the residual capacity information to obtain a cycle of the residual cycle life.
And step 604, when the period is greater than the period threshold value, judging that the power battery meets the recovery condition.
Optionally, the residual capacity information refers to the residual capacity of the power battery obtained by performing a preset charge-discharge cycle capacity test on the power battery through a preset charge-discharge rate; the cycle life test of the power battery refers to the number of cycles that a test battery core performs charge and discharge cycles according to specified test steps at a specified charge and discharge rate, and when the rated capacity of the battery is reduced to a specified value (generally 80 percent of the rated capacity). According to the GB/T-31484 suggestion, the discharge capacity of a newly-shipped battery under the condition of 1C current multiplying power is not lower than 90% of the initial capacity after 500 times of circulation, or the discharge capacity is not lower than 80% of the initial capacity when the circulation reaches 1000 times.
Optionally, the cycle life test is a cycle test of 1C charging and discharging 10 times on the power battery through the battery test system. And estimating the residual cycle life of the power battery according to the data of the power battery before leaving the factory and the corresponding cycle life curve, the total running time and the accumulated use capacity of the power battery recorded by the BMS and the capacity attenuation rate of the power battery in 10 charge-discharge cycles.
Specifically, the capacity retention rate of the power battery in the process of 10 charge and discharge cycles under the charge and discharge multiplying power of 0.5C or 1C, namely the residual capacity, can be tested; when the remaining capacity is greater than 75%, the remaining cycle life of the battery is tested. The method for testing the cycle life of the power battery can simulate the residual cycle life cycle according to the discharge capacity test result of the power battery before and after 10 cycles according to the 1C charge-discharge multiplying power.
FIG. 7 is a graph of power battery capacity retention versus cycle life cycle for one embodiment. As shown in fig. 7, the capacity retention rate of the power battery can be calculated according to the ratio of the remaining capacity to the initial capacity of the power battery, and the cycle period and the remaining cycle life period of the power battery can be found from the graph. Meanwhile, the accuracy of the evaluation of the residual cycle life cycle is confirmed according to the total running time and the accumulated use capacity of the power battery recorded by the BMS. And finally, matching the capacity retention rate and the attenuation rate of the power battery with the cycle curve again according to the capacity retention rate and the attenuation rate of the power battery in the 10-time charging and discharging cycle process, and determining the residual cycle life cycle.
For example, referring to fig. 8, a discharge capacity curve of the battery 1C before and after 10 cycles at the charge-discharge rate in one example is shown. As shown in fig. 8, the first discharge capacity was 159.09Ah, the discharge capacity after 10 cycles was 158.8Ah, and the capacity retention rate was 99.8%. The pre-factory forehead constant volume of the power battery is 180Ah, and the residual capacity retention rate of the power battery is estimated to be about 88% by combining a cycle curve and a cycle 10-time capacity retention rate test result. According to the cycle curve test result, the expected residual cycle life of the power battery is 800 weeks.
It should be understood that although the various steps in the flowcharts of fig. 1 and 4-6 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in fig. 1 and 4-6 may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, and the order of performing the sub-steps or stages is not necessarily sequential, but may be performed alternately or alternatingly with other steps or at least some of the sub-steps or stages of other steps. It should be noted that the different embodiments described above may be combined with each other.
Fig. 9 is a block diagram of a device for detecting the remaining energy of the power battery according to an embodiment. As shown in fig. 9, the power battery remaining energy detection apparatus includes an operating parameter information module 920, a temperature information module 940, a discharge information module 960, and a capacity information module 980.
And the working parameter information module 920 is configured to obtain the working parameter information of the power battery.
And the temperature information module 940 is configured to perform a temperature test on the power battery under a preset temperature condition to obtain temperature information of the power battery when the working parameter information of the power battery meets a parameter threshold condition.
And the discharge information module 960 is configured to obtain the discharge information of the power battery under a preset discharge condition when the temperature information meets the temperature threshold condition.
And the capacity information module 980 is used for acquiring the residual capacity information of the power battery under the preset charging and discharging cycle condition when the discharging information meets the pressure difference threshold condition.
In this embodiment, each module is used to execute each step in the corresponding embodiment in fig. 1, and specific reference is made to fig. 1 and the related description in the corresponding embodiment in fig. 1, which are not repeated herein.
The device for detecting the remaining energy of the power battery provided in this embodiment acquires the working parameter information of the power battery through the working parameter information module 920, the temperature information module 940 performs a temperature test on the power battery under a preset temperature condition to acquire the temperature information of the power battery when the working parameter information of the power battery meets a parameter threshold condition, the discharge information module 960 acquires the discharge information of the power battery under a preset discharge condition when the temperature information meets the temperature threshold condition, and the capacity information module 980 acquires the remaining capacity information of the power battery under a preset charge-discharge cycle condition when the discharge information meets a pressure difference threshold condition, so that the capacity detection efficiency of the power battery is improved on the premise of ensuring the accuracy of the remaining capacity test of the power battery.
Optionally, as shown in fig. 10, the power battery complementary energy detection device further includes a period acquisition module 1020 and a recovery determination module 1040.
And the period obtaining module 1020 is configured to perform a cycle life test on the power battery according to the remaining capacity information to obtain a period of the remaining cycle life.
And the recycling determination module 1040 is configured to determine that the power battery meets the recycling condition when the period is greater than the period threshold.
In this embodiment, each module is configured to execute each step in the corresponding embodiment in fig. 6, and specific reference is made to fig. 6 and the related description in the corresponding embodiment in fig. 1, which are not repeated herein.
The division of each module in the power battery remaining energy detection device is only used for illustration, and in other embodiments, the power battery remaining energy detection device may be divided into different modules as needed to complete all or part of the functions of the power battery remaining energy detection device.
For specific limitations of the power battery remaining energy detection device, reference may be made to the above limitations of the power battery remaining energy detection method, and details thereof are not repeated here. All or part of each module in the power battery complementary energy detection device can be realized by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
The embodiment of the present application further provides a computer device, which includes a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor is enabled to execute the steps of the method in the foregoing embodiments.
The embodiment of the application also provides a computer readable storage medium. One or more non-transitory computer-readable storage media embodying computer-executable instructions that, when executed by one or more processors, cause the processors to perform the steps of the power battery surplus energy detection method.
The method, the device, the computer equipment and the storage medium for detecting the residual energy of the power battery provided in the embodiment improve the detection efficiency of the capacity of the power battery on the premise of ensuring the accuracy of testing the residual capacity of the power battery, and have important economic value and popularization and practice value.
Any reference to memory, storage, database, or other medium used herein may include non-volatile and/or volatile memory. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM), which acts as external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms, such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), Enhanced SDRAM (ESDRAM), synchronous Link (Synchlink) DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and bus dynamic RAM (RDRAM).
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A method for detecting complementary energy of a power battery is characterized by comprising the following steps:
acquiring working parameter information of the power battery;
when the working parameter information of the power battery meets a parameter threshold condition, carrying out temperature test on the power battery under a preset temperature condition to obtain the temperature information of the power battery;
when the temperature information meets a temperature threshold condition, acquiring discharge information of the power battery under a preset discharge condition;
and when the discharge information meets the pressure difference threshold condition, acquiring the residual capacity information of the power battery under the preset charge-discharge cycle condition.
2. The method of claim 1, wherein the operational parameter information comprises measured resistance values, measured voltage values, and the parameter threshold conditions comprise resistance threshold conditions and voltage threshold conditions;
when the working parameter information of the power battery meets the parameter threshold condition, the temperature of the power battery is tested under the preset temperature condition to obtain the temperature information of the power battery, and the method comprises the following steps:
when the measured resistance value of the power battery meets the resistance threshold value condition, performing a voltage test on the power battery to obtain a measured voltage value of the power battery;
and when the measured voltage value of the power battery meets the voltage threshold condition, carrying out temperature test on the power battery under a preset temperature condition to obtain the temperature information of the power battery.
3. The method of claim 2, wherein the resistance threshold condition comprises a ratio of the measured resistance value to a preset resistance threshold value being less than a specific value; and/or
The voltage threshold condition includes that the measured voltage value is not less than a preset voltage threshold.
4. The method of claim 1, wherein the discharge information comprises a discharge pressure differential and a storage pressure differential, and the pressure differential threshold condition comprises a discharge pressure differential threshold condition and a storage pressure differential threshold condition;
when the discharge information meets the pressure difference threshold condition, acquiring the residual capacity information of the power battery under the preset charge-discharge cycle condition, wherein the residual capacity information comprises:
when the discharge pressure difference of the power battery meets the discharge pressure difference threshold condition, performing a storage pressure difference test on the power battery to obtain the storage pressure difference of the power battery;
and when the storage pressure difference of the power battery meets the storage pressure difference threshold condition, carrying out residual capacity test on the power battery to obtain residual capacity information of the power battery under a preset charge-discharge cycle condition.
5. The method of claim 4, wherein the discharge voltage difference threshold condition comprises the discharge voltage difference being less than the discharge voltage difference preset threshold; and/or
The stored pressure differential threshold condition includes the stored pressure differential being less than the stored pressure differential by a preset threshold.
6. The method of claim 1, further comprising:
carrying out cycle life test on the power battery according to the residual capacity information to obtain the cycle of the residual cycle life;
and when the period is greater than a period threshold value, determining that the power battery meets the recovery condition.
7. The method according to claim 1, wherein when the discharge information meets a pressure difference threshold condition, acquiring the residual capacity information of the power battery under a preset charge-discharge cycle condition comprises:
when the discharge information meets a pressure difference threshold condition, carrying out a charge-discharge cycle capacity test on the power battery according to a preset charge-discharge multiplying power so as to obtain the residual capacity information of the power battery; wherein the preset charge-discharge multiplying power comprises 0.5C charge-discharge multiplying power and 1C charge-discharge multiplying power.
8. The utility model provides a power battery complementary energy detection device which characterized in that includes:
the working parameter information module is used for acquiring the working parameter information of the power battery;
the temperature information module is used for testing the temperature of the power battery under a preset temperature condition to acquire the temperature information of the power battery when the working parameter information of the power battery meets a parameter threshold condition;
the discharging information module is used for acquiring discharging information of the power battery under a preset discharging condition when the temperature information meets a temperature threshold condition;
and the capacity information module is used for acquiring the residual capacity information of the power battery under the preset charging and discharging cycle condition when the discharging information meets the pressure difference threshold condition.
9. A computer arrangement comprising a memory and a processor, the memory having stored thereon a computer program that, when executed by the processor, causes the processor to carry out the steps of the method according to any one of claims 1 to 7.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 7.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116125295A (en) * | 2023-04-13 | 2023-05-16 | 潍柴动力股份有限公司 | Method for testing performance of fuel cell of vehicle, device thereof and system thereof |
| CN117970152A (en) * | 2024-01-04 | 2024-05-03 | 中国电子产品可靠性与环境试验研究所（（工业和信息化部电子第五研究所）（中国赛宝实验室）） | State evaluation method and device of power battery, computer equipment and storage medium |
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2021
- 2021-12-24 CN CN202111601493.0A patent/CN114487852A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116125295A (en) * | 2023-04-13 | 2023-05-16 | 潍柴动力股份有限公司 | Method for testing performance of fuel cell of vehicle, device thereof and system thereof |
| CN116125295B (en) * | 2023-04-13 | 2023-08-18 | 潍柴动力股份有限公司 | Method for testing performance of fuel cell of vehicle, device thereof and system thereof |
| CN117970152A (en) * | 2024-01-04 | 2024-05-03 | 中国电子产品可靠性与环境试验研究所（（工业和信息化部电子第五研究所）（中国赛宝实验室）） | State evaluation method and device of power battery, computer equipment and storage medium |
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