CN103884991A - Test method for single body cell DC internal resistance - Google Patents
Test method for single body cell DC internal resistance Download PDFInfo
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- CN103884991A CN103884991A CN201310692279.XA CN201310692279A CN103884991A CN 103884991 A CN103884991 A CN 103884991A CN 201310692279 A CN201310692279 A CN 201310692279A CN 103884991 A CN103884991 A CN 103884991A
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- 238000010998 test method Methods 0.000 title abstract description 10
- 238000007599 discharging Methods 0.000 claims abstract description 30
- 230000008859 change Effects 0.000 claims abstract description 15
- 238000012360 testing method Methods 0.000 claims description 32
- 238000000034 method Methods 0.000 claims description 27
- 230000007613 environmental effect Effects 0.000 claims description 14
- 230000009471 action Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
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- Tests Of Electric Status Of Batteries (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The application discloses a test method for single body cell DC internal resistance. The test method comprises the following steps: an SOC value of charge and discharge is arranged to be 50%, ambient temperature of a cell box is adjusted, an electric core is charged with 0.3C rate constant current, and charging is cut-off when voltage upper limit is reached and then the electric core stands for 1 hour; the ambient temperature of the cell box is maintained, the electric core discharges with 0.3C rate constant current and stands for 1 hour after discharging; temperature of the cell box is arranged to be the highest working temperature with humidity of 60%RH, the electric core is charged for 10s with 0.5C rate, change of numerical values of voltage is recorded by a tester, and DC charging internal resistance=(img file='201310692279x100004dest_path_image002.TIF' wi='38' he='44' /) is utilized to calculate charging internal resistance and the electric core stands for 1 minute; and the electric core is arranged to charge and discharge with different rates of 1C-5C in turn, and the change of the numerical values of voltage is recorded by the tester. The situation of influence of temperature in a certain range on DC internal resistance of the electric core can be tested via the method of testing cell DC internal resistance changing with working environment.
Description
Technical Field
The invention relates to the field of battery testing, in particular to a method for testing direct current internal resistance of a single battery.
Background
The storage battery is more and more applied to the aspects of electric automobiles and hybrid electric automobiles, and a series connection mode is generally adopted in a plurality of storage battery systems. The state degradation of some single batteries in the storage battery pack directly affects the capacity state of the whole storage battery pack, that is, the whole capacity state of the storage battery pack is determined by one single battery in the system or the storage battery with the most serious mechanism degradation state, so it is necessary to accurately test the state of the single batteries to prevent the storage battery pack from malfunctioning.
The testing of the internal resistance of the battery is an extremely important part, and the current methods for testing the internal resistance of the storage battery comprise a direct current discharge method, an alternating current injection method and the like. In the field of dc testing, two test methods are more classical. The first is a test method of HPPC in the united states, which performs a test by applying a pulse current, such as a discharge current of 5C or more and a charge current of 0.75 times the discharge current, for a test time of 10s, depending on the characteristics of the battery; the second test method is a test method of Japanese JEVSD 7132003, which mainly aims at nickel/manganese batteries and is also applied to lithium ion batteries, firstly establishes a current-voltage characteristic curve of the battery under 0-100% SOC, alternately charges or discharges the battery under the set SOC by currents of 1C, 2C, 5C and 10C respectively, the charging or discharging time is 10s respectively, and calculates the direct current internal resistance of the battery.
Wherein,direct current charging internal resistance =
DC discharge internal resistance =
However, the HPPC test method has a certain one-sidedness because the internal resistance of the cell has influence factors such as ambient temperature, energization duration, SOC capacity, and energization current.
It is not very illustrative to test the dc internal resistance in a certain state only with a pulse current. Although the JEVSD test method enables the battery cell to reach different SOC capacities through charging and discharging under different multiplying powers, the internal resistance value change of the battery cell under different multiplying powers and different SOC is measured, and the optimal working condition of the battery cell is well judged. But the influence of the environment temperature and the old and new of the battery core on the internal resistance of the battery is lacked.
Disclosure of Invention
The technical problem of the present invention is to provide a method for testing the direct current internal resistance of a single battery, which detects the degree of influence of the environmental temperature on the battery core, records the working states of the battery core at different temperatures, and thus measures the internal resistance values of the battery at different environmental temperatures.
In order to solve the technical problems, the invention adopts the technical scheme that:
a method for testing direct current internal resistance of a single battery comprises the following steps:
s103: setting the SOC value of charge and discharge to be 50%, adjusting the ambient temperature of the battery box, namely, charging the battery cell at a constant current of 0.3C, stopping charging when the upper limit of voltage is reached, and standing for 1 hour;
s104: keeping the environmental temperature of the battery box, discharging the battery cell at constant current with the multiplying power of 0.3C, and standing for 1 hour after discharging;
s105: setting the temperature of the battery box to the maximum working temperature, the humidity to be 60% RH, charging the battery core at the multiplying power of 0.5C for 10s, recording the voltage value change by the tester, and utilizing the direct current charging internal resistance =
Calculating the charging internal resistance, and standing for 1 minute;
s106: keeping the temperature and humidity, discharging the battery cell at a multiplying power of 0.5C for 10s, recording the voltage value change by the tester, and utilizing the direct current internal discharge resistance =
Calculating the internal discharge resistance, and standing for 5 minutes;
s107: and according to the methods of the steps S105 and S106, sequentially setting the battery cell to carry out charging and discharging at different multiplying powers in the range of 1C-5C, recording the voltage value change by using a tester so as to calculate the charging and discharging internal resistance, and standing for 30 minutes after the test is finished.
Further, before step 1, the following steps are included:
s101: adjusting the environmental temperature of the battery box, discharging the battery cell at a constant current of 1C, stopping charging when the lower limit of the voltage of the single body is reached, and standing the battery box for 1 hour;
s102: adjusting the environmental temperature of the battery box, charging the battery cell at a constant current of 0.5C, stopping charging when the upper limit of the voltage of the single body is reached, and standing the battery box for 1 hour;
s103: adjusting the environmental temperature of the battery box, discharging the battery cell at a constant current of 1C multiplying power, stopping charging when the lower limit of the voltage of the single body is reached, and standing the battery box for 1 hour;
s104: repeating steps S101-S103 at least twice to activate cell performance.
In the further technical scheme, the battery is charged and discharged at different multiplying powers repeatedly for many times, so that the performance of the battery core can be activated better, and the following test steps can be laid better.
Further, after step S107, the following steps are also included:
s108, resetting the temperature of the battery box to be 10 ℃ lower than the maximum working temperature, and repeating the step S107;
step S109, resetting the temperature of the battery box to 20 ℃ below the maximum operating temperature, and repeating step S107 until the temperature reaches the minimum temperature of the battery.
In the further technical scheme, the temperature of the battery box is reset to be 10 degrees and 20 degrees lower than the maximum working temperature, so that the test values of the direct current internal resistance at different temperatures can be further tested.
Further, steps S101-S103 are repeated twice in step S104. Two tests are preferred, but it can be three, four or even more.
Furthermore, the tester is a charging and discharging test cabinet.
Compared with the prior art, the invention has the following advantages and beneficial effects:
according to the method for testing the direct current internal resistance of the battery, which is disclosed by the invention, by using the method for testing the direct current internal resistance of the battery with the change of the working environment, the influence condition of the temperature in a certain range on the direct current internal resistance of the battery cell can be tested, and meanwhile, the optimal working temperature of the battery cell under different multiplying powers can be obtained. The method can also select different SOC capacities for testing, and has certain variability. The direct current internal resistance of the battery is an important index for indicating the working condition of the battery, so that the working conditions of the battery core at different temperatures have important reference values for practical application.
Meanwhile, the battery internal resistance under different working environment conditions is well tested by properly selecting the combination of the charge-discharge multiplying power and the standing time of the battery core, and the tested data is more accurate and reliable by resetting the working temperature to be 10 ℃ and 20 ℃ which are the lowest temperature.
Detailed Description
The technical solutions of the present invention are described in detail below, clearly and completely, and obviously, the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments, and all other embodiments obtained by those skilled in the art without creative efforts based on the embodiments of the present invention belong to the protection scope of the present invention.
In this document, relational terms such as first and second, top and bottom, and the like may be used to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. The terms "comprises," "comprising," or any other variation thereof, are intended to cover and exclusively encompass a process, method, article, or apparatus that comprises a list of elements, but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element referred to as "comprising …" does not exclude the presence of additional identical elements in the process, method, article or apparatus that comprises the element, unless the context requires otherwise.
Example 1
A method for testing direct current internal resistance of a single battery comprises the following steps: s103: setting the SOC value of charge and discharge to be 50%, adjusting the ambient temperature of the battery box, namely, charging the battery cell at a constant current of 0.3C, stopping charging when the upper limit of voltage is reached, and standing for 1 hour; s104: keeping the environmental temperature of the battery box, discharging the battery cell at constant current with the multiplying power of 0.3C, and standing for 1 hour after discharging; s105: setting the temperature of the battery box to the maximum working temperature, the humidity to be 60% RH, charging the battery core at the multiplying power of 0.5C for 10s, recording the voltage value change by the tester, and utilizing the direct current charging internal resistance =
Calculating the charging internal resistance, and standing for 1 minute; s106: keeping the temperature and humidity, discharging the battery cell at a multiplying power of 0.5C for 10s, recording the voltage value change by the tester, and utilizing the direct current internal discharge resistance =Calculating the internal discharge resistance, and standing for 5 minutes; s107: and according to the methods of the steps S105 and S106, sequentially setting the battery cell to carry out charging and discharging at different multiplying powers in 1C, recording the voltage value change by using a tester, calculating the charging and discharging internal resistance, and standing for 30 minutes after the test is finished.
Example 2
Unlike embodiment 1, in addition to the technical solution set forth in embodiment 1, in this preferred embodiment, step 1 further includes the following steps before: s101: adjusting the environmental temperature of the battery box, discharging the battery cell at a constant current of 1C, stopping charging when the lower limit of the voltage of the single body is reached, and standing the battery box for 1 hour; s102, adjusting the environmental temperature of the battery box, charging the battery cell at a constant current of 0.5C, stopping charging when the upper limit of the voltage of the single body is reached, and standing the battery box for 1 hour; s103, adjusting the environmental temperature of the battery box, discharging the battery cell at a constant current of 1C rate, stopping charging when the lower limit of the voltage of the single body is reached, and standing the battery box for 1 hour; s104, repeating the steps S101-S103 at least twice to activate the cell performance.
This preferred embodiment is also different from embodiment 1 in that the following step is further included after step S107: s108: resetting the temperature of the battery box to be 10 ℃ lower than the maximum working temperature, and repeating the step S107; s109: the temperature of the battery box is reset to 20 deg.c lower than the maximum operating temperature and step S107 is repeated until the temperature reaches the minimum temperature of the battery.
In the preferred embodiment, steps S101-S103 are repeated twice in step S104. Of course, in other embodiments, this time may be three, four or even more. In the preferred embodiment, the tester is a charge and discharge test cabinet, but other testers are possible in other embodiments.
Example 3
Unlike in embodiment 2, step S107 is: and according to the methods of the steps S105 and S106, sequentially setting the battery cell to carry out charging and discharging at different multiplying powers in 5C, recording the voltage value change by using a tester, calculating the charging and discharging internal resistance, and standing for 30 minutes after the test is finished.
Example 4
Unlike embodiments 2 and 3, step S107 is: and according to the methods of the steps S105 and S106, sequentially setting the battery cell to carry out charging and discharging at different multiplying powers in 3C, recording the voltage value change by using a tester, calculating the charging and discharging internal resistance, and standing for 30 minutes after the test is finished.
The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (5)
1. A method for testing direct current internal resistance of a single battery is characterized by comprising the following steps:
(S103) setting the SOC value of charging and discharging to be 50%, adjusting the ambient temperature of the battery box, enabling the battery cell to be charged at a constant current of 0.3C, stopping charging when the upper limit of the voltage is reached, and standing for 1 hour;
(S104) keeping the environmental temperature of the battery box, discharging the battery cell at a constant current of 0.3C, and standing for 1 hour after discharging;
(S105) setting the temperature of the battery case to a maximum operating temperature with a humidity of 60% RH, and electricityCharging the core at a multiplying power of 0.5C for 10s, recording the voltage value change by a tester, and utilizing the direct current charging internal resistance =
Calculating the charging internal resistance, and standing for 1 minute;
(S106) keeping the temperature and the humidity, discharging the battery cell at the multiplying power of 0.5C for 10S, recording the voltage value change by the tester, and utilizing the direct current internal discharge resistance =
Calculating the internal discharge resistance, and standing for 5 minutes;
(S107) according to the methods of the steps S105 and S106, sequentially setting the battery cell to carry out charging and discharging at different multiplying powers in 1C-5C, recording the voltage value change by using a tester, calculating the charging and discharging internal resistance, and standing for 30 minutes after the test is finished.
2. The method for testing the direct current internal resistance of the single battery according to claim 1, characterized by further comprising the following steps before the step 1:
(S101) adjusting the environmental temperature of the battery box, discharging the battery cell at a constant current of 1C multiplying power, stopping charging when the lower limit of the voltage of the single body is reached, and standing the battery box for 1 hour;
(S102) adjusting the environmental temperature of the battery box, charging the battery cell at a constant current of 0.5C, stopping charging when the upper limit of the voltage of the battery cell is reached, and standing the battery box for 1 hour;
(S103) adjusting the environmental temperature of the battery box, discharging the battery cell at a constant current of 1C multiplying power, stopping charging when the lower limit of the voltage of the single body is reached, and standing the battery box for 1 hour;
(S104) repeating the steps S101-S103 at least twice to activate the cell performance.
3. The method for testing the direct current internal resistance of the single battery according to claim 1, further comprising the following steps after the step S107:
(S108) resetting the temperature of the battery box to 10 ℃ lower than the maximum operating temperature, and repeating step S107;
(S109) the temperature of the battery box is reset to 20 deg.c lower than the maximum operation temperature, and step S107 is repeated until the temperature reaches the minimum temperature of the battery.
4. The method for testing the direct current internal resistance of the single battery as claimed in claim 2, wherein the steps S101-S103 are repeated twice in the step S104.
5. The method for testing the direct current internal resistance of the single battery as claimed in claim 1, wherein the tester is a charge and discharge test cabinet.
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