CN117783924A - Working condition cycle life testing method of lithium ion battery pack for industrial and commercial energy storage - Google Patents
Working condition cycle life testing method of lithium ion battery pack for industrial and commercial energy storage Download PDFInfo
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- CN117783924A CN117783924A CN202410121117.9A CN202410121117A CN117783924A CN 117783924 A CN117783924 A CN 117783924A CN 202410121117 A CN202410121117 A CN 202410121117A CN 117783924 A CN117783924 A CN 117783924A
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- 238000012360 testing method Methods 0.000 title claims abstract description 45
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 20
- 238000004146 energy storage Methods 0.000 title claims abstract description 20
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 35
- 238000007599 discharging Methods 0.000 claims abstract description 29
- 238000001514 detection method Methods 0.000 claims abstract description 12
- 230000006978 adaptation Effects 0.000 claims abstract description 5
- 238000004891 communication Methods 0.000 claims abstract description 5
- 238000011156 evaluation Methods 0.000 claims description 3
- 230000002159 abnormal effect Effects 0.000 claims description 2
- 238000005336 cracking Methods 0.000 claims 1
- 230000035699 permeability Effects 0.000 claims 1
- 230000001351 cycling effect Effects 0.000 abstract description 4
- 230000007613 environmental effect Effects 0.000 description 4
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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Abstract
The invention discloses a working condition cycle life testing method of a lithium ion battery pack for industrial and commercial energy storage, which relates to the technical field of battery pack life detection, wherein S1, the battery pack is subjected to 24h temperature adaptation at the ambient temperature; s2, the charging and discharging equipment reads the maximum allowable discharging current I1, the minimum allowable discharging voltage V1, the maximum allowable charging current I2 and the maximum allowable charging voltage V2 sent by the battery pack BMS through CAN communication; s3, standing for 30min; s4, charging the constant current (I2) -constant voltage (V2) by the charging and discharging equipment through a current/voltage following process step until the charging current is less than 2.5A; s5, standing for 30min; s6, the charging and discharging equipment discharges the I1 current through the current following process step until the allowable current I1=0 or the battery voltage reaches a minimum allowable value V1; and S7, cycling is carried out from the steps S3 to S6, and the battery life estimated by the obtained experimental result is more reliable by identifying the most suitable current request to carry out the charge-discharge cycling test under different states of the battery pack.
Description
Technical Field
The invention relates to the technical field of battery pack service life detection, in particular to a working condition cycle life testing method of a lithium ion battery pack for industrial and commercial energy storage.
Background
With the rapid development of new energy industry, technology is advancing continuously, and requirements on batteries are becoming severe gradually. In practical application, many uncertain factors and various operating conditions exist, and in order to better improve the service life of the battery and ensure the safety performance of the battery, the requirements of the battery control system on the battery and an external power supply/load are also increasing. The battery is required to monitor the state of the battery more comprehensively, different states are required to be controlled, and the external power supply/load is required to be limited to a certain extent. This also means that the battery's operation in practice is much more uncontrollable. The conventional circulation test method at present mainly comprises constant current circulation or constant power circulation, and then proper standing time is determined according to the temperature rise condition of charge and discharge and the heat dissipation condition of a battery pack. In practice, the current/power is not constant, and the limitation of the current/power is performed by combining multiple dimensional parameters such as the temperature, the voltage, the SOC and the like of the battery, for example, the maximum allowable discharging current/power is reduced when the SOC of the battery pack is low, the maximum allowable charging current/power is reduced when the SOC is high, and the maximum allowable charging or maximum allowable discharging current/power is limited when the temperature is high or low. The current control on the charge and discharge of the battery with a plurality of variable parameters cannot be realized by common battery pack charge and discharge equipment in the market at present, and only condition judgment and logic control can be performed on a certain variable, for example, the battery pack charge and discharge equipment is set to be' when the temperature is higher than 45 ℃, but can not jump to the next step when the temperature is recovered to below 45 ℃, and can only be added continuously after the step, so that the battery pack charge and discharge equipment is very complicated. When there is a complex process step, once the test process step is edited, the subsequent parameter modification is very easy to make mistakes, and meanwhile, the battery pack is charged and discharged with constant current or power, so that the battery pack has larger heat accumulation and slower heat dissipation, and needs a long time for cooling to room temperature, but the overlong shelf time greatly increases the test period of the cycle life test, and the expected life prediction cannot be obtained quickly. Therefore, most life tests are constant current/constant power tests performed without considering the limited power effect of temperature and under the premise of ensuring that the battery does not exceed the use temperature. The current/power is limited under the condition of high temperature in actual use, so that the service life of the battery is prolonged, and therefore, the working condition cycle life testing method of the lithium ion battery pack for industrial and commercial energy storage is provided.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a working condition cycle life testing method of a lithium ion battery pack for industrial and commercial energy storage, which solves the problems in the background art.
In order to achieve the above purpose, the invention is realized by the following technical scheme: a working condition cycle life testing method of a lithium ion battery pack for industrial and commercial energy storage comprises the following steps: the method comprises the following steps:
s1, performing temperature adaptation on the battery pack for 24 hours at the ambient temperature;
s2, the charging and discharging equipment reads the maximum allowable discharging current I1, the minimum allowable discharging voltage V1, the maximum allowable charging current I2 and the maximum allowable charging voltage V2 sent by the battery pack BMS through CAN communication;
s3, standing for 30min;
s4, charging the constant current (I2) -constant voltage (V2) by the charging and discharging equipment through a current/voltage following process step until the charging current is less than 2.5A;
s5, standing for 30min;
s6, the charging and discharging equipment discharges the I1 current through the current following process step until the allowable current I1=0 or the battery voltage reaches a minimum allowable value V1;
s7, performing circulation from the step S3 to the step S6.
In the present invention, further, a safety check is required for the battery pack before the step S2 is performed, and the safety check includes battery appearance detection and battery connection terminal detection.
In the present invention, further, the battery appearance detection includes detecting whether there is a significant deformation of the battery case, a crack, and an abnormal permeate of the battery appearance;
the battery connection terminal detection includes detecting whether the connection terminal is loose or oxidized;
in the invention, the battery pack is placed in the room to be detected smoothly in S1, and no artificial interference is made to the temperature in the test room;
in the present invention, further, the environmental test chamber is programmed before S3: and searching for the average month temperature T1-T24 of about 24 months according to the required evaluation area, and editing the average month temperature T1-T24 into an environmental test box temperature program, wherein each temperature duration is 24 hours. And simultaneously starting a program circulation test until the battery pack circulation is finished.
In the present invention, the average temperature in the month before S3 is an average temperature per hour per day in the month.
The invention provides a working condition cycle life testing method of a lithium ion battery pack for industrial and commercial energy storage, which has the following beneficial effects:
1. according to the working condition cycle life testing method of the lithium ion battery pack for industrial and commercial energy storage, the battery pack is identified to perform charge and discharge cycle testing under different states (temperature, voltage and SOC), the most suitable current request is identified to be more fit with actual use situations, the battery life estimated by the obtained experimental result is more reliable, the situation of the battery pack in use in different environments throughout the year can be simulated by simulating the situation of temperature change throughout the year, the battery pack BMS can make charge and discharge request currents corresponding to different temperatures according to logic strategies, and the equipment simulates the current situation in actual use by identifying the charge and discharge current request of the battery pack BMS, so that the battery pack testing result is more accurate.
2. According to the working condition cycle life testing method of the lithium ion battery pack for industrial and commercial energy storage, a plurality of variable factors can be simultaneously present, and a BMS system is utilized to identify and calculate required charge and discharge current requests according to the factors. The charging and discharging device supplies a corresponding charging and discharging current according to the request value. And the control relation between each variable factor and the current can be modified by updating parameters such as a voltage-current meter, a temperature-current meter, an SOC-current meter and the like in BMS software or an upper computer window, and the control of a single variable can be realized.
Drawings
FIG. 1 is a schematic flow chart of the battery life detection in a room without temperature control according to the present invention;
FIG. 2 is a schematic flow chart of battery life detection in a programmable environmental test chamber according to the present invention;
FIG. 3 is a graph comparing the present invention with a constant current cycling method;
FIG. 4 is a graph of the present invention versus constant current cycling temperature.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.
Referring to fig. 1 to 4, the present invention provides a technical solution:
example 1
A working condition cycle life testing method of a lithium ion battery pack for industrial and commercial energy storage comprises the following steps: the method comprises the following steps:
s1, performing temperature adaptation on the battery pack for 24 hours at the ambient temperature;
s2, the charging and discharging equipment reads the maximum allowable discharging current I1, the minimum allowable discharging voltage V1, the maximum allowable charging current I2 and the maximum allowable charging voltage V2 sent by the battery pack BMS through CAN communication;
s3, standing for 30min;
s4, charging the constant current (I2) -constant voltage (V2) by the charging and discharging equipment through a current/voltage following process step until the charging current is less than 2.5A;
s5, standing for 30min;
s6, the charging and discharging equipment discharges the I1 current through the current following process step until the allowable current I1=0 or the battery voltage reaches a minimum allowable value V1;
s7, performing circulation from the step S3 to the step S6.
As shown in fig. 3: (1) the two methods have little difference in test time, and the constant current test has small charge-discharge time ratio, but requires longer shelf time. Firstly, the temperature reaches 45 ℃ and the current can be reduced at the end of charge and discharge, so that the shelf time can be shortened; (2) the temperature of the two methods is basically consistent and fluctuates between 40 ℃ and 45 ℃. The constant current has more regular temperature, and the temperature and the current of the first method are mutually influenced; (3) the smaller the charge-discharge multiplying power/current of the battery is, the longer the service life of the battery is, so that the life prediction obtained by the test of the method is more practical and longer than that of the constant current circulation method.
Example two
A working condition cycle life testing method of a lithium ion battery pack for industrial and commercial energy storage comprises the following steps:
s1, performing temperature adaptation on a battery pack in an environment test box for 24 hours;
s2, the charging and discharging equipment reads the maximum allowable discharging current I1, the minimum allowable discharging voltage V1, the maximum allowable charging current I2 and the maximum allowable charging voltage V2 sent by the battery pack BMS through CAN communication;
program editing is carried out on the environment test box: and searching for the average month temperature T1-T24 of about 24 months according to the required evaluation area, and editing the average month temperature T1-T24 into an environmental test box temperature program, wherein each temperature duration is 24 hours. Simultaneously starting a program circulation test until the battery pack circulation is finished;
s3, standing for 30min;
s4, charging the constant current (I2) -constant voltage (V2) by the charging and discharging equipment through a current/voltage following process step until the charging current is less than 2.5A;
s5, standing for 30min;
s6, the charging and discharging equipment discharges the I1 current through the current following process step until the allowable current I1=0 or the battery voltage reaches a minimum allowable value V1;
s7, performing circulation from the step S3 to the step S6.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (8)
1. A working condition cycle life testing method of a lithium ion battery pack for industrial and commercial energy storage is characterized by comprising the following steps of: the method comprises the following steps:
s1, performing temperature adaptation on the battery pack for 24 hours at the ambient temperature;
s2, the charging and discharging equipment reads the maximum allowable discharging current I1, the minimum allowable discharging voltage V1, the maximum allowable charging current I2 and the maximum allowable charging voltage V2 sent by the battery pack BMS through CAN communication;
s3, standing for 30min;
s4, charging the constant current (I2) -constant voltage (V2) by the charging and discharging equipment through a current/voltage following process step until the charging current is less than 2.5A;
s5, standing for 30min;
s6, the charging and discharging equipment discharges the I1 current through the current following process step until the allowable current I1=0 or the battery voltage reaches a minimum allowable value V1;
s7, performing circulation from the step S3 to the step S6.
2. The method for testing the working condition cycle life of the lithium ion battery pack for industrial and commercial energy storage according to claim 1, wherein the method comprises the following steps of: before the step S2, a safety check is required for the battery pack, wherein the safety check includes battery appearance detection and battery connection terminal detection.
3. The method for testing the working condition cycle life of the lithium ion battery pack for industrial and commercial energy storage according to claim 2, wherein the method comprises the following steps of: the battery appearance detection includes detecting whether there is significant deformation, cracking, and abnormal permeability of the battery casing.
4. The method for testing the working condition cycle life of the lithium ion battery pack for industrial and commercial energy storage according to claim 3, wherein the method comprises the following steps of: the battery connection terminal detection includes detecting whether the connection terminal is loose or oxidized.
5. The method for testing the working condition cycle life of the lithium ion battery pack for industrial and commercial energy storage according to claim 4, wherein the method comprises the following steps of: the battery pack is placed in the room to be detected smoothly in the S1, and the temperature in the test room is not disturbed at all.
6. The method for testing the working condition cycle life of the lithium ion battery pack for industrial and commercial energy storage according to claim 5, wherein the method comprises the following steps of:
and (3) performing program editing on the environment test box before the step (S3), searching for average month temperatures T1-T24 of about 24 months according to the required evaluation region, editing the average month temperatures T1-T24 into the temperature program of the environment test box, wherein each temperature duration is 24 hours, and waiting for starting a program circulation test.
7. The method for testing the working condition cycle life of the lithium ion battery pack for industrial and commercial energy storage according to claim 6, wherein the method comprises the following steps of: and starting a program circulation test until the battery pack circulation is finished.
8. The method for testing the working condition cycle life of the lithium ion battery pack for industrial and commercial energy storage according to claim 7, wherein the method comprises the following steps of: the month average temperature in S3 is a temperature average value of the daily hourly temperature for the month.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410121117.9A CN117783924A (en) | 2024-01-29 | 2024-01-29 | Working condition cycle life testing method of lithium ion battery pack for industrial and commercial energy storage |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410121117.9A CN117783924A (en) | 2024-01-29 | 2024-01-29 | Working condition cycle life testing method of lithium ion battery pack for industrial and commercial energy storage |
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| CN117783924A true CN117783924A (en) | 2024-03-29 |
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| CN202410121117.9A Pending CN117783924A (en) | 2024-01-29 | 2024-01-29 | Working condition cycle life testing method of lithium ion battery pack for industrial and commercial energy storage |
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