CN113125981B - Battery standing method, battery standing device, electronic equipment and storage medium - Google Patents
Battery standing method, battery standing device, electronic equipment and storage medium Download PDFInfo
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- CN113125981B CN113125981B CN202110393703.5A CN202110393703A CN113125981B CN 113125981 B CN113125981 B CN 113125981B CN 202110393703 A CN202110393703 A CN 202110393703A CN 113125981 B CN113125981 B CN 113125981B
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- 238000000034 method Methods 0.000 title claims abstract description 48
- 238000012360 testing method Methods 0.000 claims description 266
- 238000007600 charging Methods 0.000 claims description 41
- 238000007599 discharging Methods 0.000 claims description 39
- 238000005259 measurement Methods 0.000 claims description 38
- 238000010280 constant potential charging Methods 0.000 claims description 12
- 238000004364 calculation method Methods 0.000 claims description 10
- 238000004590 computer program Methods 0.000 claims description 10
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- 230000000284 resting effect Effects 0.000 description 3
- 238000010277 constant-current charging Methods 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 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]
- G01R31/389—Measuring internal impedance, internal conductance or related variables
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- 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
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Abstract
The invention provides a battery standing method, a battery standing device, an electronic device and a storage medium, wherein the method comprises the following steps: determining a corresponding correlation curve based on the battery to be tested; the correlation curve is used for representing the relation between the internal resistance of the battery and the standing time; determining the standing time length of the battery to be measured from the correlation curve, and standing the battery to be measured according to the standing time length so as to balance the battery core temperature and the environment temperature of the battery to be measured; the standing time length refers to the corresponding minimum standing time length when the internal resistance of the battery in the correlation curve is kept constant. The invention can accurately quantify the standing time, and avoid the problems that the temperature of the battery cell cannot reach balance with the external environment temperature due to the too short standing time and the low-temperature performance test efficiency is reduced due to the too long standing time.
Description
Technical Field
The present invention relates to the field of battery technologies, and in particular, to a method and apparatus for standing a battery, an electronic device, and a storage medium.
Background
In recent years, with rapid development of portable electronic devices, electric vehicles, and power grid energy storage technologies, there is an increasing demand for batteries and energy storage systems with high energy density, long service life, and high safety, and in particular, low-temperature performance of the batteries has a great influence on the life cycle of the batteries, so that in the process of designing and developing the batteries, the low-temperature performance of the batteries needs to be tested.
Typically, prior to testing the low temperature performance of a battery, the cell is allowed to stand in a specific low temperature environment (e.g., -20 ℃) in order to equilibrate both the internal and surface temperatures of the cell to the external ambient temperature. In the traditional method, the battery cell is allowed to stand for a certain period of time at random under a specific low-temperature environment, such as 0.5h, 1h, 2h, 3h and the like, so that the internal temperature of the cell and the external environment temperature reach balance, but the standing time is often too short, and the internal temperature of the battery cell and the external environment temperature do not reach balance; or the standing time is too long, the testing time is prolonged, and the testing efficiency is affected.
Disclosure of Invention
The invention provides a battery standing method, a battery standing device, electronic equipment and a storage medium, which are used for solving the defect that batteries cannot be accurately and efficiently stood in the prior art.
The invention provides a battery standing method, which comprises the following steps:
determining a corresponding correlation curve based on the battery to be tested; the correlation curve is used for representing the relationship between the internal resistance of the battery and the standing time;
determining the standing time length of the battery to be tested from the correlation curve, and standing the battery to be tested according to the standing time length so as to balance the battery core temperature and the environment temperature of the battery to be tested; the standing time period refers to the minimum standing time period corresponding to the time when the internal resistance of the battery in the correlation curve is kept constant.
According to the battery standing method provided by the invention, the correlation curve is obtained by obtaining the corresponding internal resistance of the battery after standing the test battery for different preset durations, and the internal resistance of the battery of the test battery under each preset duration is determined based on the following steps:
at room temperature, adjusting the test battery to a test calibration state; the type of the test battery is the same as the type of the battery to be tested;
placing the test battery in a first preset standing environment, and standing for a first preset time period to obtain a first standing voltage of the measurement battery;
after the measurement battery is kept stand, discharging the test battery at a first preset multiplying power, and obtaining a first discharge cut-off voltage of the measurement battery after a first preset discharging period;
and determining the internal resistance of the battery of the test battery based on the current of the measurement battery, the first rest voltage and the first discharge cut-off voltage.
According to the battery standing method provided by the invention, the battery internal resistance of the test battery is determined based on an internal resistance calculation model, and the internal resistance calculation model is as follows:
R＝(U s -U e )/I；
wherein R represents the internal resistance of the battery of the test battery, U s Representing the first rest voltage of the measurement battery, U e Representing a first discharge cut-off voltage of the measurement battery, I representing a present current of the measurement battery.
According to the method for standing a battery provided by the invention, the method for adjusting the test battery to a test calibration state comprises the following steps:
after the test battery is charged to a charging cut-off voltage by the first rated current, the test battery is charged by adjusting to a constant voltage charging mode, and the charging is stopped until the current of the test battery is smaller than a first preset current;
and discharging the test battery with the first rated current after stopping charging for a first preset period of time until the test battery reaches a first preset state of charge.
According to the method for standing a battery provided by the invention, the determining of the internal resistance of the battery of the test battery further comprises the following steps:
and determining the discharge electric quantity of the test battery, charging the test battery with the first rated current until the charge electric quantity of the test battery is the same as the discharge electric quantity, and standing for a second preset time period to prepare for the next test.
According to the battery standing method provided by the invention, the correlation curve is obtained by obtaining the corresponding internal resistance of the battery after a plurality of test batteries are kept stand for a corresponding period of time, and the types of the test batteries are the same as the types of the batteries to be tested;
the internal resistance of each test battery under the corresponding duration is determined based on the following steps:
at room temperature, adjusting the test battery to a test calibration state;
placing the test battery in a second preset standing environment, and obtaining a second standing voltage of the test battery after standing for a corresponding period of time;
after the test battery is kept stand, discharging the test battery at a second preset multiplying power, and obtaining a second discharge cut-off voltage of the test battery after a second preset discharging period;
and determining the internal resistance of the test battery based on the current of the test battery, the second standing voltage and the second discharge cut-off voltage.
According to the method for standing the battery, the test battery is adjusted to a test calibration state, and the method comprises the following steps:
after the test battery is charged to a charging cut-off voltage by the second rated current, the test battery is charged by adjusting to a constant voltage charging mode, and the charging is stopped until the current of the test battery is smaller than a second preset current;
and discharging the test battery with the second rated current after stopping charging for a second preset period of time until the test battery reaches a second preset state of charge.
The invention also provides a battery standing device based on the battery standing method, which comprises the following steps:
the determining unit is used for determining a corresponding correlation curve based on the battery to be tested; the correlation curve is used for representing the relationship between the internal resistance of the battery and the standing time;
the static unit is used for determining static time length of the battery to be tested from the correlation curve, and static the battery to be tested according to the static time length so as to balance the battery core temperature and the environment temperature of the battery to be tested; the standing time period refers to the minimum standing time period corresponding to the time when the internal resistance of the battery in the correlation curve is kept constant.
The invention also provides an electronic device comprising a memory, a processor and a computer program stored on the memory and operable on the processor, wherein the processor implements the steps of any one of the above-described battery rest methods when executing the computer program.
The present invention also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the battery rest method as described in any of the above.
According to the battery standing method, the device, the electronic equipment and the storage medium, the corresponding correlation curve is determined based on the battery to be tested, the standing time length of the battery to be tested is determined from the correlation curve, and the battery to be tested is subjected to standing with the standing time length, so that the internal temperature of the battery cell and the external environment temperature can be balanced.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of a method for standing a battery provided by the invention;
FIG. 2 is a schematic view of a correlation curve provided by the present invention;
FIG. 3 is a schematic diagram of the test internal resistance provided by the present invention;
fig. 4 is a schematic structural view of a battery rest device provided by the invention;
fig. 5 is a schematic structural diagram of an electronic device provided by the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The low-temperature performance of the lithium ion power battery cell is very important, and in the process of designing and developing the battery cell, the full life cycle is required to test the electrical performance (such as low-temperature capacity, low-temperature energy, low-temperature power, low-temperature resistance, low-temperature multiplying power and the like) related to low temperature. In general, the test related to low temperature performance has a common and very important step, namely a standing step before the low temperature performance test: and (3) standing the battery cell under a specific low-temperature environment (such as-20 ℃). The purpose is to balance the internal and surface temperatures of the battery cell with the external ambient temperature.
At present, the common practice in the industry is that under a specific low-temperature environment, the battery cell is kept stand for 0.5h, 1h, 2h and 3h, so that the internal temperature of the battery cell and the external environment temperature reach balance, but whether the battery cell is actually balanced or not cannot be judged. If the standing time is too short, the internal temperature of the battery cell and the external environment temperature are not balanced, so that the test data cannot truly reflect the real electrical performance of the battery cell in a specific low-temperature environment, and the test is distorted; if the standing time is too long, the testing time is prolonged, and the testing efficiency is affected. Especially, the current battery cell types are many, such as square, soft package, cylinder and the like, and the battery cell sizes are also many, such as the cylinder battery cells have 18650, 21700, 46800 and the like. The battery cells of different types and sizes are also different in standing time length.
In this regard, the present invention provides a method of battery rest. Fig. 1 is a schematic flow chart of a method for standing a battery according to the present invention, as shown in fig. 1, the method includes the following steps:
step 110, determining a corresponding correlation curve based on the battery to be tested; the correlation curve is used for representing the relation between the internal resistance of the battery and the standing time;
step 120, determining the standing time length of the battery to be tested from the correlation curve, and standing the battery to be tested according to the standing time length so as to balance the battery core temperature of the battery to be tested with the ambient temperature; the standing time length refers to the corresponding minimum standing time length when the internal resistance of the battery in the correlation curve is kept constant.
Specifically, when the low-temperature performance test is performed on the battery, the battery needs to be subjected to standing treatment, so that the internal temperature of the battery cell and the external environment temperature reach balance, but the internal temperature of the battery cell cannot be directly measured. In the traditional method, a method for standing for a certain period of time randomly cannot confirm whether the internal temperature of the battery cell is balanced with the external environment temperature, if the standing time is too short, the internal temperature of the battery cell is not balanced with the external environment temperature, and if the standing time is too long, the time for testing the low-temperature performance can be prolonged, and the testing efficiency is affected.
Based on the above, since the natural logarithm of the internal resistance of the battery and the inverse temperature are in a linear relation, and the influence of the low temperature on the internal resistance of the battery cell is large, namely, the internal resistance of the battery cell and the temperature have a correlation, the internal temperature of the battery cell can be represented, and if the internal resistance of the battery cell is kept constant, the internal temperature of the battery cell and the external environment temperature are balanced.
Therefore, the embodiment of the invention determines the standing time length of the battery to be tested based on the correlation curve for representing the relationship between the internal resistance of the battery and the standing time length. The correlation curve is determined based on the type of the battery to be measured, the type of the battery to be measured is determined based on the battery to be measured, for example, the type of the battery to be measured corresponding to different battery cell specifications is different, that is, the corresponding correlation curve is different. Thus, after determining the parameters of the battery under test, a corresponding correlation curve may be determined.
After the correlation curve corresponding to the battery to be measured is determined, the corresponding standing time length of the standing battery can be determined from the correlation curve, namely when the internal resistance of the battery in the correlation curve is kept constant, the internal temperature of the battery core of the battery to be measured and the external environment temperature are balanced, so that the corresponding minimum standing time length when the internal resistance of the battery is kept constant is used as the standing time length of the battery to be measured. As shown in fig. 2, when the internal resistance is kept constant (i.e., the internal resistance value shown by the broken line), the corresponding minimum rest period is taken as the rest period of the battery to be measured.
In addition, the correlation curve can be obtained by standing a battery with the same type as the battery to be measured for different periods of time and collecting the corresponding internal resistance of the battery, for example, the standing period of time is 1h, and the corresponding internal resistance is a; standing for 2h, wherein the corresponding internal resistance is b; and the like, acquiring data of a plurality of groups of standing time periods and internal resistances, and connecting the data with smooth curves on coordinate axes so as to obtain a correlation curve.
According to the battery standing method provided by the embodiment of the invention, the corresponding correlation curve is determined based on the battery to be tested, the standing time length of the battery to be tested is determined from the correlation curve, and the battery to be tested is kept stand for the standing time length, so that the internal temperature of the battery cell and the external environment temperature can be balanced.
Based on the above embodiment, the correlation curve is obtained by obtaining the corresponding internal resistance of the battery after the test battery is kept stand for different preset durations, and the internal resistance of the test battery under each preset duration is determined based on the following steps:
at room temperature, adjusting the test battery to a test calibration state; the type of the test battery is the same as the type of the battery to be tested;
placing the test battery in a first preset standing environment, and standing for a first preset time period to obtain a first standing voltage of the measurement battery;
after the measurement battery is kept stand, discharging the measurement battery with a first preset multiplying power, and obtaining a first discharge cut-off voltage of the measurement battery after a first preset discharging period;
based on the measured current of the battery, the first resting voltage, and the first discharge cutoff voltage, a battery internal resistance of the test battery is determined.
Specifically, the test battery refers to a battery with the same type as the battery to be tested, and the test battery can be understood as the battery with the same cell specification as the battery to be tested. The test battery may be a battery to be tested, that is, the test battery and the battery to be tested are the same battery. The correlation curve can be obtained by obtaining the corresponding internal resistance of the battery after the test battery is kept stand for different preset time periods, for example, the test battery is kept stand for 0.5h, 1h, 1.5h, 2h, 2.5h, 3h, 3.5h and 4h respectively, and then the corresponding internal resistance of the battery is obtained respectively, so that the correlation curve is obtained. The first preset duration may be set according to practical situations, which is not specifically limited in the embodiment of the present invention.
Because the test battery needs to stand for a plurality of different preset time periods, in order to ensure the accuracy and consistency of the test data, the test battery needs to be adjusted to a test calibration state before the test battery stands for a corresponding preset time period each time, so that the initial state of the test battery before each test is consistent. The room temperature may be set to 25 ℃, and the test calibration state may be set according to practical situations, for example, the battery is discharged with the same rated current at the room temperature, which is not particularly limited in the embodiment of the present invention.
After the test battery is adjusted to a test calibration state, the test battery can be placed in a first preset standing environment, and a first standing voltage of the measurement battery is obtained after standing for a preset period of time. For example, the test battery is placed in a temperature box, the temperature of the temperature box is set to-20 ℃, and after a preset period of time (such as 0.5h, 1h, etc.) is allowed to stand, a first standing voltage of the test battery is obtained.
And after the measurement battery is kept stand, discharging the measurement battery with a first preset multiplying power, and obtaining a first discharge cut-off voltage of the measurement battery after a first preset discharging period. For example, after the measurement battery is left to stand, the test battery is discharged at a rate of 2.0C, and the first discharge cut-off voltage (i.e., terminal voltage) of the measurement battery is obtained after 30 s.
After the first standing voltage and the first discharge cut-off voltage are obtained, the current of the measured battery is obtained, and the internal resistance of the battery to be tested can be determined based on the first standing voltage, the internal resistance of the battery to be tested is the resistance of the battery to be tested after the battery to be tested stands for a preset period of time.
Based on any of the above embodiments, the battery internal resistance of the test battery is determined based on an internal resistance calculation model, which is:
R＝(U s -U e )/I；
wherein R represents the internal resistance of the battery, U s Indicating the first rest voltage of the battery, U e Indicating the first discharge cut-off voltage of the measured batteryI represents the current of the measurement battery.
Specifically, after the first rest voltage U is obtained s First discharge cut-off voltage U e And then, acquiring the current I of the measured battery, and determining the corresponding battery internal resistance R of the tested battery after standing for a preset time based on the internal resistance calculation model.
After the internal resistances of the batteries after the batteries are subjected to standing for a preset period of time are obtained, a correlation curve of the internal resistances and the standing period of time can be drawn based on the coordinate axes, so that the corresponding standing period of time of the batteries can be determined based on the correlation curve. As shown in fig. 3, can be based on U s 、U e And I, determining the internal resistance of the battery through an internal resistance calculation model.
Based on any of the above embodiments, adjusting the test battery to a test calibration state includes:
after the test battery is charged to a charging cut-off voltage by the first rated current, the test battery is charged by adjusting to a constant voltage charging mode, and the charging is stopped until the current of the test battery is smaller than a first preset current;
and discharging the test battery with the first rated current after stopping charging for a first preset period of time until the test battery reaches a first preset state of charge.
Specifically, when the test battery is adjusted to a test calibration state, the test battery is charged with a first rated current (e.g., 1/2C), and is adjusted to a constant voltage charging mode after being charged to a charging cut-off voltage, until the current of the test battery is less than a first preset current (e.g., 0.05C), and the charging is stopped. The charge cutoff voltage is a voltage at which the battery reaches a fully charged state during a predetermined constant current charging period. If the battery is charged continuously after reaching the charge cutoff voltage, i.e., overcharged, the battery performance and life may be damaged. Constant voltage charging is charging in which the voltage between the two electrodes of the battery is maintained at a constant value, and the charging current can be automatically adjusted according to the change of the state of charge of the battery.
After stopping charging for a first preset period of time (e.g., after resting for 1 h), discharging the test battery at a first rated current (e.g., 1/2C) until the test battery reaches a first preset state of charge (e.g., 50% SOC).
Therefore, after the test battery is adjusted to be in the test calibration state, the initial state of the test battery before each standing is consistent, so that the measured data has comparability, and further, the correlation curve can be accurately obtained.
Based on any of the above embodiments, determining the internal battery resistance of the test battery further comprises:
and determining the discharge electric quantity of the test battery, charging the test battery with a first rated current until the charge electric quantity and the discharge electric quantity of the test battery are the same, and standing for a second preset time period to prepare for the next test.
Specifically, after each time the test battery is left standing and the corresponding internal resistance of the battery is obtained, and before the next standing, since the test battery has been subjected to the discharging process, the state of the test battery is inconsistent with the state before discharging, in order to enable the test conditions of each set of data to be consistent, the state of the test battery needs to be restored to the state before discharging, so that the data of the correlation curve can be accurately obtained.
Therefore, after determining the internal resistance of the battery, i.e. after determining the internal resistance of the last time of the battery after standing, the embodiment of the invention charges the battery with the first rated current (for example, 1/2C) until the charge capacity and the discharge capacity of the battery are the same, so that the state of the battery is consistent with the state before discharging, and the battery stands for a second preset period of time to prepare for the next test. It will be appreciated that in order to keep the battery stable after charging, it may be allowed to stand for a further period of time (e.g. 1 h) after charging before the next test. Table 1 is a list of test flows of the same cell resistance, as shown in table 1, for the same cell, the resistances of different durations of rest under the same SOC are tested, and the specific test flows are as follows:
TABLE 1
Based on any embodiment, the correlation curve is obtained by obtaining the corresponding internal resistance of the batteries after standing a plurality of test batteries for a corresponding period of time, and the types of the test batteries are the same as the types of the batteries to be tested;
the internal resistance of each test battery under the corresponding duration is determined based on the following steps:
at room temperature, adjusting the test battery to a test calibration state;
placing the test battery in a second preset standing environment, and obtaining a second standing voltage of the test battery after standing for a corresponding period of time;
after the test battery is kept stand, discharging the test battery at a second preset multiplying power, and obtaining a second discharge cut-off voltage of the test battery after a second preset discharging period;
and determining the battery internal resistance of the test battery based on the current of the test battery, the second rest voltage and the second discharge cut-off voltage.
Specifically, the correlation curve may be obtained by obtaining the corresponding internal resistances of the batteries after standing for a corresponding period of time for a plurality of test batteries, where the type of each test battery is the same as the type of the battery to be tested, that is, the cell specification of each test battery is the same as the cell specification of the battery to be tested. The correlation curve may be obtained by respectively obtaining the corresponding internal resistances of the batteries after standing for a corresponding period of time for each test battery, for example, standing the test battery 1 for 0.5h, standing the test battery 2 for 1h, standing the test battery 3 for 1.5h, standing the test battery 4 for 2h, standing the test battery 5 for 2.5h, standing the test battery 6 for 3h, standing the test battery 7 for 3.5h and standing the test battery 8 for 4h, and then obtaining the internal resistances of the batteries corresponding to the test batteries 1-8 respectively, thereby obtaining the correlation curve. The corresponding time period for each test battery to stand can be set according to practical situations, and the embodiment of the invention is not particularly limited thereto.
Because the initial states of the test batteries may be different, in order to ensure the accuracy and consistency of the test data, the test batteries need to be adjusted to the test calibration state before the test batteries stand for a corresponding period of time, so that the initial states of the test batteries are consistent. The room temperature may be set to 25 ℃, and the calibration state of the test may be set according to practical situations, such as discharging the battery with the same rated current at the room temperature.
After the test battery is adjusted to be in the test calibration state, the test battery can be placed in a second preset standing environment, and a second standing voltage of the measurement battery is obtained after standing for a corresponding period of time. For example, the test battery is placed in a temperature box, the temperature of the temperature box is set to-20 ℃, and after a standing period (for example, 0.5 h), a second standing voltage of the test battery is obtained.
And after the test battery is kept stand, discharging the test battery at a second preset multiplying power, and obtaining a second discharge cut-off voltage of the measurement battery after a second preset discharging period. For example, after the test cell was left to stand, the test cell was discharged at a rate of 2.0C, and a second discharge cut-off voltage (i.e., terminal voltage) of the test cell was obtained after 30 s.
After the second standing voltage and the second discharge cut-off voltage are obtained, the current of the test battery is obtained, and the battery internal resistance of the test battery can be determined based on the second standing voltage, the battery internal resistance is the resistance of the test battery after the test battery stands for a corresponding period of time. The resistance can also be obtained by using the internal resistance calculation model in the above embodiment.
Based on any of the above embodiments, adjusting the test battery to a test calibration state includes:
after the test battery is charged to the charging cut-off voltage by the second rated current, the test battery is charged by adjusting to a constant voltage charging mode, and the charging is stopped until the current of the test battery is smaller than the second preset current;
and discharging the test battery with a second rated current after stopping charging for a second preset period of time until the test battery reaches a second preset state of charge.
Specifically, when the test battery is adjusted to the test calibration state, the test battery is charged with a second rated current (for example, 1/2C), and after the test battery is charged to the charge cut-off voltage, the test battery is adjusted to a constant voltage charging mode to be charged, and the charging is stopped until the current of the test battery is smaller than a second preset current (for example, 0.05C). The charge cutoff voltage is a voltage at which the battery reaches a fully charged state during a predetermined constant current charging period. If the battery is charged continuously after reaching the charge cutoff voltage, i.e., overcharged, the battery performance and life may be damaged. Constant voltage charging is charging in which the voltage between the two electrodes of the battery is maintained at a constant value, and the charging current can be automatically adjusted according to the change of the state of charge of the battery.
After stopping charging for a second preset period of time (e.g., after resting for 1 h), the test battery is discharged at a second rated current (e.g., 1/2C) until the test battery reaches a second preset state of charge (e.g., 50% SOC).
Therefore, after the test batteries are adjusted to be in the test calibration state, the initial states of the test batteries can be consistent, so that the measured data have comparability, and further, the correlation curve can be accurately obtained.
Table 2 is a list of a plurality of cell resistor test flows, as shown in table 2, 8 cells with good consistency in the same batch are selected, and the resistors with different durations are tested under the same SOC, and the specific test flows are as follows:
TABLE 2
The battery rest device provided by the invention is described below, and the battery rest device described below and the battery rest method described above can be referred to correspondingly to each other.
Based on any of the above embodiments, the present invention further provides a battery standing device, as shown in fig. 4, including:
a determining unit 410, configured to determine a corresponding correlation curve based on the battery to be tested; the correlation curve is used for representing the relationship between the internal resistance of the battery and the standing time;
the standing unit 420 is configured to determine a standing duration of the battery to be measured from the correlation curve, and perform standing on the battery to be measured according to the standing duration, so that a cell temperature of the battery to be measured and an ambient temperature reach a balance; the standing time period refers to the minimum standing time period corresponding to the time when the internal resistance of the battery in the correlation curve is kept constant.
Based on any of the above embodiments, the correlation curve is obtained by obtaining the corresponding internal resistance of the battery after the test battery is kept stand for different preset durations, and the device further includes:
the first calibration unit is used for adjusting the test battery to a test calibration state at room temperature; the type of the test battery is the same as the type of the battery to be tested;
the first standing unit is used for placing the test battery into a first preset standing environment, and obtaining a first standing voltage of the measurement battery after standing for a first preset time period;
the first discharging unit is used for discharging the test battery at a first preset multiplying power after the measurement battery is kept stand, and obtaining a first discharge cut-off voltage of the measurement battery after a first preset discharging period;
a first calculation unit for determining a battery internal resistance of the test battery based on the present current of the measurement battery, the first rest voltage, and the first discharge cutoff voltage.
Based on any of the above embodiments, the battery internal resistance of the test battery is determined based on an internal resistance calculation model, which is:
R＝(U s -U e )/I；
wherein R represents the internal resistance of the battery of the test battery, U s Representing the first rest voltage of the measurement battery, U e Representing a first discharge cut-off voltage of the measurement battery, I representing a present current of the measurement battery.
Based on any of the above embodiments, the first calibration unit includes:
the first charging calibration unit is used for charging the test battery to a charging cut-off voltage with a first rated current, and then adjusting the test battery to a constant voltage charging mode to charge the test battery until the current of the test battery is smaller than a first preset current;
and the first discharging calibration unit is used for discharging the test battery with the first rated current after stopping charging for a first preset period of time until the test battery reaches a first preset charge state.
Based on any of the above embodiments, further comprising:
and the recovery unit is used for determining the discharge electric quantity of the test battery after determining the internal resistance of the battery of the test battery, charging the test battery with the first rated current until the charge electric quantity of the test battery is the same as the discharge electric quantity, and standing for a second preset time period to prepare for the next test.
Based on any one of the embodiments, the correlation curve is obtained by obtaining the corresponding internal resistances of the batteries after standing a plurality of test batteries for a corresponding period of time, and the types of the test batteries are the same as the types of the batteries to be tested; the apparatus further comprises:
the second calibration unit is used for adjusting the test battery to a test calibration state at room temperature;
the second standing unit is used for placing the test battery into a second preset standing environment, and obtaining a second standing voltage of the test battery after standing for a corresponding period of time;
the second discharging unit is used for discharging the test battery at a second preset multiplying power after the test battery is kept stand, and obtaining a second discharge cut-off voltage of the test battery after a second preset discharging period;
and a second calculation unit configured to determine a battery internal resistance of the test battery based on a present current of the test battery, the second rest voltage, and the second discharge cutoff voltage.
Based on any of the above embodiments, the second calibration unit is configured to include:
the second charging calibration unit is used for charging the test battery to a charging cut-off voltage with a second rated current, and then adjusting the test battery to a constant voltage charging mode to charge the test battery until the current of the test battery is smaller than a second preset current;
and the second discharge calibration unit is used for discharging the test battery with the second rated current after stopping charging for a second preset period of time until the test battery reaches a second preset charge state.
Fig. 5 is a schematic structural diagram of an electronic device according to the present invention, and as shown in fig. 5, the electronic device may include: processor 510, communication interface (Communications Interface) 520, memory 530, and communication bus 540, wherein processor 510, communication interface 520, memory 530 complete communication with each other through communication bus 540. Processor 510 may invoke logic instructions in memory 530 to perform a battery rest method comprising: determining a corresponding correlation curve based on the battery to be tested; the correlation curve is used for representing the relationship between the internal resistance of the battery and the standing time; determining the standing time length of the battery to be tested from the correlation curve, and standing the battery to be tested according to the standing time length so as to balance the battery core temperature and the environment temperature of the battery to be tested; the standing time period refers to the minimum standing time period corresponding to the time when the internal resistance of the battery in the correlation curve is kept constant.
Further, the logic instructions in the memory 530 described above may be implemented in the form of software functional units and may be stored in a computer-readable storage medium when sold or used as a stand-alone product. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
In another aspect, the present invention also provides a computer program product comprising a computer program stored on a non-transitory computer readable storage medium, the computer program comprising program instructions which, when executed by a computer, enable the computer to perform a battery rest method provided by the above methods, the method comprising: determining a corresponding correlation curve based on the battery to be tested; the correlation curve is used for representing the relationship between the internal resistance of the battery and the standing time; determining the standing time length of the battery to be tested from the correlation curve, and standing the battery to be tested according to the standing time length so as to balance the battery core temperature and the environment temperature of the battery to be tested; the standing time period refers to the minimum standing time period corresponding to the time when the internal resistance of the battery in the correlation curve is kept constant.
In yet another aspect, the present invention also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, is implemented to perform the battery rest methods provided above, the method comprising: determining a corresponding correlation curve based on the battery to be tested; the correlation curve is used for representing the relationship between the internal resistance of the battery and the standing time; determining the standing time length of the battery to be tested from the correlation curve, and standing the battery to be tested according to the standing time length so as to balance the battery core temperature and the environment temperature of the battery to be tested; the standing time period refers to the minimum standing time period corresponding to the time when the internal resistance of the battery in the correlation curve is kept constant.
The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on this understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the respective embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. A method of standing a battery, comprising:
determining a corresponding correlation curve based on the battery to be tested; the correlation curve is used for representing the relationship between the internal resistance of the battery and the standing time;
determining the standing time length of the battery to be tested from the correlation curve, and standing the battery to be tested according to the standing time length so as to balance the battery core temperature and the environment temperature of the battery to be tested; the standing time length refers to the corresponding minimum standing time length when the internal resistance of the battery in the correlation curve is kept constant;
the correlation curve is obtained by obtaining the corresponding internal resistance of the battery after the test battery is kept stand for different preset durations, and the internal resistance of the battery of the test battery under each preset duration is determined based on the following steps:
at room temperature, adjusting the test battery to a test calibration state; the type of the test battery is the same as the type of the battery to be tested;
placing the test battery in a first preset standing environment, and standing for a first preset time period to obtain a first standing voltage of the measurement battery;
after the measurement battery is kept stand, discharging the test battery at a first preset multiplying power, and obtaining a first discharge cut-off voltage of the measurement battery after a first preset discharging period;
and determining the internal resistance of the battery of the test battery based on the current of the measurement battery, the first rest voltage and the first discharge cut-off voltage.
2. The battery rest method according to claim 1, wherein the battery internal resistance of the test battery is determined based on an internal resistance calculation model that is:
R＝(U s -U e )/I；
wherein R represents the internal resistance of the battery of the test battery, U s Representing the first rest voltage of the measurement battery, U e Representing a first discharge cut-off voltage of the measurement battery, I representing a present current of the measurement battery.
3. The battery rest method according to claim 1, wherein the adjusting the test battery to a test calibration state includes:
after the test battery is charged to a charging cut-off voltage by the first rated current, the test battery is charged by adjusting to a constant voltage charging mode, and the charging is stopped until the current of the test battery is smaller than a first preset current;
and discharging the test battery with the first rated current after stopping charging for a first preset period of time until the test battery reaches a first preset state of charge.
4. The battery rest method according to claim 3, wherein the determining the battery internal resistance of the test battery further comprises, after that:
and determining the discharge electric quantity of the test battery, charging the test battery with the first rated current until the charge electric quantity of the test battery is the same as the discharge electric quantity, and standing for a second preset time period to prepare for the next test.
5. The battery standing method according to any one of claims 1 to 4, wherein the correlation curve is obtained by obtaining corresponding internal resistances of a plurality of test batteries after a corresponding period of time is spent on the test batteries, and the type of each test battery is the same as the type of the battery to be measured;
the internal resistance of each test battery under the corresponding duration is determined based on the following steps:
at room temperature, adjusting the test battery to a test calibration state;
placing the test battery in a second preset standing environment, and obtaining a second standing voltage of the test battery after standing for a corresponding period of time;
after the test battery is kept stand, discharging the test battery at a second preset multiplying power, and obtaining a second discharge cut-off voltage of the test battery after a second preset discharging period;
and determining the internal resistance of the test battery based on the current of the test battery, the second standing voltage and the second discharge cut-off voltage.
6. The method of claim 5, wherein said adjusting the test cell to a test calibration state comprises:
after the test battery is charged to a charging cut-off voltage by the second rated current, the test battery is charged by adjusting to a constant voltage charging mode, and the charging is stopped until the current of the test battery is smaller than a second preset current;
and discharging the test battery with the second rated current after stopping charging for a second preset period of time until the test battery reaches a second preset state of charge.
7. A battery rest apparatus based on the battery rest method according to any one of claims 1 to 6, comprising:
a determining unit for determining a corresponding correlation curve based on the battery to be tested; the correlation curve is used for representing the relationship between the internal resistance of the battery and the standing time;
the static unit is used for determining static time length of the battery to be tested from the correlation curve, and static the battery to be tested according to the static time length so as to balance the battery core temperature and the environment temperature of the battery to be tested; the standing time length refers to the corresponding minimum standing time length when the internal resistance of the battery in the correlation curve is kept constant;
the correlation curve is obtained by obtaining the corresponding internal resistance of the battery after the test battery is kept stand for different preset durations, and the internal resistance of the battery of the test battery under each preset duration is determined based on the following steps:
at room temperature, adjusting the test battery to a test calibration state; the type of the test battery is the same as the type of the battery to be tested;
placing the test battery in a first preset standing environment, and standing for a first preset time period to obtain a first standing voltage of the measurement battery;
after the measurement battery is kept stand, discharging the test battery at a first preset multiplying power, and obtaining a first discharge cut-off voltage of the measurement battery after a first preset discharging period;
and determining the internal resistance of the battery of the test battery based on the current of the measurement battery, the first rest voltage and the first discharge cut-off voltage.
8. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the battery rest method according to any one of claims 1 to 6 when the program is executed.
9. A non-transitory computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when executed by a processor, implements the steps of the battery rest method according to any one of claims 1 to 6.
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| CN117214740A (en) * | 2023-11-08 | 2023-12-12 | 宁德时代新能源科技股份有限公司 | Self-discharge abnormality detection method and device, electronic equipment and storage medium |
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| CN103884991A (en) * | 2013-12-17 | 2014-06-25 | 惠州市亿能电子有限公司 | Test method for single body cell DC internal resistance |
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