CN114236394A - Method for testing maximum current of battery core and application - Google Patents
Method for testing maximum current of battery core and application Download PDFInfo
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- CN114236394A CN114236394A CN202111534332.4A CN202111534332A CN114236394A CN 114236394 A CN114236394 A CN 114236394A CN 202111534332 A CN202111534332 A CN 202111534332A CN 114236394 A CN114236394 A CN 114236394A
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- 238000012360 testing method Methods 0.000 title claims abstract description 112
- 238000000034 method Methods 0.000 title claims abstract description 34
- 230000003247 decreasing effect Effects 0.000 claims abstract description 16
- 238000010998 test method Methods 0.000 claims abstract description 6
- 238000007600 charging Methods 0.000 claims description 8
- 238000007599 discharging Methods 0.000 claims description 5
- 238000010277 constant-current charging Methods 0.000 claims description 4
- 230000002596 correlated effect Effects 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 238000013329 compounding Methods 0.000 abstract 1
- 238000011161 development Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000000875 corresponding effect Effects 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010280 constant potential charging Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
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Abstract
The invention provides a method for testing the maximum current of a battery core and application thereof. The test method comprises the following steps: (1) selecting the increment current of the battery core; (2) testing the battery cell by using the incremental current in the step (1), wherein the testing comprises a constant current test and a constant voltage test which are sequentially carried out to obtain a decreasing current curve of the battery cell; (3) and (3) the intersection point of the decreasing current curve and the target capacity curve in the step (2) is the maximum current. The testing method is simple and quick, and the maximum current of the battery cell is accurately tested by using a constant current and constant voltage compounding mode.
Description
Technical Field
The invention relates to the field of chemical accumulators, in particular to a method for testing the maximum current of a battery cell and application thereof.
Background
In the development process of the battery cell, the design of the battery cell needs to be adjusted through test result feedback. The maximum charge and discharge capacity test of the battery cell is indispensable lacking data in the development process of the battery cell. However, in the actual testing process, the maximum charge-discharge capacity test needs to be repeated for many times and continuously approaches to the true value. In the process, more test resources are consumed, time is wasted, and the development cycle of the battery cell is prolonged.
Taking the maximum discharge capacity as an example, the prior art tests by using a simple and rough trial and error method. The battery cell is adjusted to be tested, repeated for many times, different battery cells are used for trial, and finally the maximum discharge current meeting the requirements is tested.
The existing method needs multiple attempts, and needs a long time to wait for the cell thermal balance process when the temperature is higher or lower, so that the method occupies more test resources and has a long time.
CN111308163A discloses a method for determining the maximum current of pulse discharge of a lithium ion power battery, comprising the first step of establishing the relationship between the terminal voltage of the pulse discharge of the battery and the discharge current by adopting a constant current pulse discharge method; secondly, establishing the relation between the direct current internal resistance of constant current pulse discharge and discharge current; thirdly, establishing a relation between the discharge power and the discharge current of the constant-current pulse discharge; fourthly, establishing a relation between the power utilization rate of constant current pulse discharge and the discharge current; and fifthly, determining the value range of the maximum current of the battery pulse discharge by integrating a plurality of preset limiting conditions. However, when the maximum current is determined, various restrictive relationships are required, the testing method is complicated, a large amount of time is consumed, and the development cycle of the battery cell is increased.
CN112379289A discloses a method for testing the maximum current of a lithium ion battery, which comprises the following steps: (1) the method comprises the steps of (1) testing the actual capacity of a battery, (2) adjusting the SOC state, and (3) testing the maximum current, wherein the actual capacity is tested by placing the battery at a temperature to be tested, the SOC state is adjusted to a target state according to the measured actual capacity, and after placing for a certain time, the maximum current in different SOC states is tested by adopting a constant voltage pulse mode. The test process uses a constant voltage pulse test method, but constant voltage charging is carried out after constant current charging, the temperature of the battery is easy to rise, and the service life of the battery is reduced.
How to rapidly and accurately test the maximum charge-discharge capacity of the battery cell is an important research direction in the field.
Disclosure of Invention
The invention aims to provide a method for testing the maximum current of a battery cell and application thereof, which can obtain the maximum charge-discharge capacity of the battery cell through one-time testing.
In order to achieve the purpose, the invention adopts the following technical scheme:
one of the objectives of the present invention is to provide a method for testing the maximum current of a battery cell, wherein the method comprises the following steps:
(1) selecting the increment current of the battery core;
(2) testing the battery cell by using the incremental current in the step (1), wherein the testing comprises a constant current test and a constant voltage test which are sequentially carried out to obtain a decreasing current curve of the battery cell;
(3) and (3) the intersection point of the decreasing current curve and the target capacity curve in the step (2) is the maximum current.
By using the incremental decrease testing method, the corresponding relation between the maximum current and the current charge state of the battery cell under the measuring condition can be obtained through testing and the like; and further combining the initial charge state of the battery cell, the target current and the test time, and calculating to obtain the corresponding relation between the initial charge state of the battery cell, the target current and the current charge state of the battery cell, thereby obtaining the maximum charge/discharge current of the battery cell. The method is simple and rapid, is different from the conventional method which only carries out a constant current test idea, uses a constant current and constant voltage composite mode, and defines the use principle and the limitation of the incremental current.
The constant current test is carried out by using the incremental current, and the battery cell can reach a voltage boundary within the test time, so that the maximum current can be measured; and when the voltage boundary is reached, converting the voltage boundary into a constant voltage test, and continuously reducing the current to obtain a decreasing current curve. The current values in the decreasing current curve are the limit values of the battery cell, and further the limit value corresponding to the condition to be measured, namely the maximum current of the battery cell under the condition can be determined by using the target capacity curve. Therefore, the required result can be obtained by only carrying out one-time test, the efficiency is improved, and the resources are saved.
As a preferred technical solution of the present invention, the battery cell maximum current includes a battery cell maximum charging current and/or a battery cell maximum discharging current.
As a preferred technical solution of the present invention, the incremental current in step (1) enables the voltage of the battery cell to reach the boundary voltage within the test time.
Preferably, the incremental current in step (1) is selected according to the test conditions and test equipment of the test in step (2).
As a preferred technical solution of the present invention, the test conditions include a test temperature, a test cell state of charge, a test time, and a type of a test cell.
Preferably, the types of the test cells include energy type cells and power type cells.
As a preferable technical solution of the present invention, in the test of the maximum discharge current of the battery cell, the incremental current is in positive correlation with the test temperature.
Preferably, the incremental current is positively correlated with the test cell state of charge during a test of cell maximum discharge current.
Preferably, in the test of the maximum discharge current of the battery cell, the incremental current is in negative correlation with the test time.
Preferably, in the test of the maximum charging current of the battery cell, the incremental current is in negative correlation with the test temperature.
Preferably, the incremental current and the test cell state of charge are inversely related in a test of cell maximum charge current;
preferably, in the test of the maximum charging current of the battery cell, the test time is in negative correlation with the incremental current.
Preferably, the power value of the energy type battery cell is in a range of 4.8-5.2C, wherein the power value may be 4.8C, 4.9C, 5.0C, 5.1C, 5.2C, etc., but is not limited to the enumerated values, and other values not enumerated in the numerical range are also applicable.
Preferably, the power value of the power type battery cell is in a range of 9.8-10.2C, wherein the power value may be 9.8C, 9.9C, 10.0C, 10.1C, 10.2C, etc., but is not limited to the recited values, and other values not recited in the range of values are also applicable.
As a preferred technical solution of the present invention, the incremental current is a maximum measurement range of the test equipment.
As a preferable technical scheme of the invention, the constant current test in the step (2) comprises a constant current charging test or a constant current discharging test.
Preferably, the cut-off voltage of the constant current test is the boundary voltage of the tested electric core.
According to the preferable technical scheme of the invention, the current is taken as an abscissa and the capacity change is taken as an ordinate in the test in the step (2), and a decreasing current curve is drawn;
preferably, the target capacity curve is drawn according to the test of the step (2) by taking the current as an abscissa and the target capacity as an ordinate.
The second purpose of the present invention is to provide an application of the method for testing the maximum current of the battery cell according to the first purpose, wherein the method is applied to the field of chemical accumulators.
Compared with the prior art, the invention has the following beneficial effects:
the method for testing the maximum current of the battery core provided by the invention has the advantages of short time, simple process and less occupied resources, and can only carry out sequential testing to prepare the maximum current of the battery core.
Drawings
FIG. 1 is a decreasing current curve diagram according to example 1 of the present invention.
FIG. 2 is a graph of target capacity for example 1 of the present invention.
FIG. 3 is a cross-point diagram of a decreasing current curve and a target current curve in example 1 of the present invention.
Fig. 4 is a decreasing current curve diagram according to embodiment 2 of the present invention.
Fig. 5 is a graph of target capacity for example 2 of the present invention.
FIG. 6 is a cross-point diagram of a decreasing current curve and a target current curve in example 2 of the present invention.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
Example 1
The embodiment provides a method for testing the maximum current of a battery cell, which comprises the following steps:
the EE054AP cell is used, the cell capacity is 54Ah, the cell is a power cell, and the maximum discharge current of 30s in the state of 25 ℃/20% SOC needs to be tested.
And selecting 10C-540A as incremental current to perform constant current discharge, reaching the voltage limit boundary of the battery cell when the incremental current is discharged for 8.5s, and converting into a constant voltage working mode to perform discharge. And the process is continued for 31.5s and then ended.
From the test results, the current was plotted as the abscissa and the change in capacity was plotted as the ordinate to obtain a decreasing current curve (as shown in fig. 1).
The target capacity of the current is plotted on the abscissa and the target capacity of the current is plotted on the ordinate to obtain a target capacity curve (as shown in fig. 2).
The two curves were merged to obtain the intersection point as shown in fig. 3. The current value at the intersection point is 332.49A, and then the maximum discharge current of the A battery cell at 25 ℃/20% SOC state for 30s can be determined to be 332.49A.
Example 2
The embodiment provides a method for testing the maximum current of a battery cell, which comprises the following steps:
the embodiment provides a method for testing the maximum current of a battery cell, which comprises the following steps:
an EE061AE cell is used, the cell capacity is 61Ah, the cell is an energy cell, and the maximum charging current of 15s in the state of 25 ℃/50% SOC needs to be tested.
And selecting 5C-3050A as the incremental current to perform constant current charging, reaching the voltage limit boundary of the battery cell when the incremental current is processed for 1.6s, and converting into a constant voltage working mode to perform discharging. And the process is continued for 18.4s and then ended.
From the test results, the current was plotted as the abscissa and the change in capacity was plotted as the ordinate to obtain a decreasing current curve (as shown in fig. 4).
The target capacity of the current was plotted on the abscissa and the target capacity of the current was plotted on the ordinate to obtain a target capacity curve (as shown in fig. 5).
The two curves were merged to obtain the intersection point as shown in fig. 6. The current value at the intersection point is 223.4A, and the maximum charging current of the a cell at 15s in the state of 25 ℃/50% SOC can be determined to be 223.4A.
The applicant declares that the above description is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are within the scope and disclosure of the present invention.
Claims (10)
1. The method for testing the maximum current of the battery core is characterized by comprising the following steps of:
(1) selecting the increment current of the battery core;
(2) testing the battery cell by using the incremental current in the step (1), wherein the testing comprises a constant current test and a constant voltage test which are sequentially carried out to obtain a decreasing current curve of the battery cell;
(3) and (3) the intersection point of the decreasing current curve and the target capacity curve in the step (2) is the maximum current.
2. The testing method of claim 1, wherein the cell maximum current comprises a cell maximum charging current and/or a cell maximum discharging current.
3. The testing method according to claim 1 or 2, wherein the incremental current of step (1) causes the voltage of the cell to reach a boundary voltage within a test time;
preferably, the incremental current in step (1) is selected according to the test conditions and test equipment of the test in step (2).
4. The test method of claim 3, wherein the test conditions include a test temperature, a test cell state of charge, a test time, and a type of test cell;
preferably, the types of the test cells include energy type cells and power type cells.
5. The test method according to claim 4, wherein the incremental current is positively correlated with the test temperature in the test of the maximum cell discharge current;
preferably, in the test of the cell maximum discharge current, the incremental current and the test cell state of charge are positively correlated;
preferably, in the test of the maximum discharge current of the battery cell, the incremental current is in negative correlation with the test time;
preferably, in the test of the maximum charging current of the battery cell, the incremental current is in negative correlation with the test temperature;
preferably, the incremental current and the test cell state of charge are inversely related in a test of cell maximum charge current;
preferably, in the test of the maximum charging current of the battery cell, the test time is in negative correlation with the incremental current;
preferably, the power value range of the energy type battery cell is 4.8-5.2C;
preferably, the power value range of the power type battery cell is 9.8-10.2C.
6. The test method of claim 3, wherein the incremental current is a maximum range of the test equipment.
7. The test method according to any one of claims 1 to 6, wherein the constant current test of step (2) comprises a constant current charging test or a constant current discharging test;
preferably, the cut-off voltage of the constant current test is the boundary voltage of the tested electric core.
8. The testing method according to claim 7, wherein the voltage of the constant voltage test in step (2) is a boundary voltage of the tested electric core.
9. The method of any one of claims 1-8, wherein said decreasing current curve is plotted according to step (2) with current as abscissa and capacity variation as ordinate;
preferably, the target capacity curve is drawn according to the test of the step (2) by taking the current as an abscissa and the target capacity as an ordinate.
10. Use of a method according to any of claims 1 to 9 for testing the maximum current of a cell, characterized in that the method is used in the field of chemical accumulators.
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Patent Citations (9)
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| CN103558553A (en) * | 2013-09-29 | 2014-02-05 | 奇瑞汽车股份有限公司 | Experimental method for low-current discharging of storage battery and experimental device using same |
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