CN113504477A - Battery cell testing method, device and system - Google Patents

Battery cell testing method, device and system Download PDF

Info

Publication number
CN113504477A
CN113504477A CN202110885909.XA CN202110885909A CN113504477A CN 113504477 A CN113504477 A CN 113504477A CN 202110885909 A CN202110885909 A CN 202110885909A CN 113504477 A CN113504477 A CN 113504477A
Authority
CN
China
Prior art keywords
discharge
battery
voltage
temperature
target voltage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202110885909.XA
Other languages
Chinese (zh)
Other versions
CN113504477B (en
Inventor
杨鹏
王睿翔
刘士玉
陈文涛
张宝林
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eve Energy Co Ltd
Hubei Eve Power Co Ltd
Original Assignee
Eve Energy Co Ltd
Hubei Eve Power Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Eve Energy Co Ltd, Hubei Eve Power Co Ltd filed Critical Eve Energy Co Ltd
Priority to CN202110885909.XA priority Critical patent/CN113504477B/en
Publication of CN113504477A publication Critical patent/CN113504477A/en
Application granted granted Critical
Publication of CN113504477B publication Critical patent/CN113504477B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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]
    • G01R31/385—Arrangements for measuring battery or accumulator variables
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • 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
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Secondary Cells (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention discloses a battery cell testing method, a battery cell testing device and a battery cell testing system. The battery cell testing method comprises the following steps: receiving a test temperature, a reference temperature, a first charging multiplying factor, a first discharging multiplying factor, a second discharging multiplying factor and a target voltage; controlling the temperature to be the reference temperature, and controlling the battery to be fully charged by adopting a first charging rate; controlling the temperature to be the test temperature, discharging the battery by adopting a first discharge rate, detecting the voltage of the battery, and judging whether the voltage changes to a target voltage; when the voltage reaches the target voltage, controlling to discharge the battery for a specified time by adopting a second discharge rate, recording the terminal voltage after the specified time of discharge, and recording the discharge current at the specified time of discharge; and determining the test temperature and the discharge internal resistance under the target voltage according to the target voltage, the target voltage and the discharge current.

Description

Battery cell testing method, device and system
Technical Field
The embodiment of the invention relates to a battery technology, in particular to a method, a device and a system for testing a battery cell.
Background
In the process of designing the battery, the battery needs to be tested, and a hybrid pulse power performance test (HPPC) is a conventional test method and is mainly used for determining the discharge power capability of the battery and determining the functional relationship between the battery fixed impedance and the battery polarization impedance and the SOC (State of Charge).
At present, when an HPPC test is carried out, the temperature and the charge-discharge current are generally fixed, the test condition has a large difference from an actual application scene, and the test result cannot represent the discharge capacity of the battery cell in the actual application process.
Disclosure of Invention
The invention provides a method, a device and a system for testing a battery cell, which aim to enable a testing environment to be close to an actual application environment as much as possible and improve the reliability of a testing result.
In a first aspect, an embodiment of the present invention provides a battery cell testing method, including: receiving a test temperature, a reference temperature, a first charging multiplying factor, a first discharging multiplying factor, a second discharging multiplying factor and a target voltage;
controlling the temperature to the reference temperature, and controlling the battery to be fully charged by adopting the first charging rate;
controlling the temperature to the test temperature, controlling the battery to discharge by adopting the first discharge rate, detecting the voltage of the battery, and judging whether the voltage changes to the target voltage;
when the voltage reaches the target voltage, controlling to discharge the battery for a specified time by adopting the second discharge rate, recording the terminal voltage after the specified time of discharge, and recording the discharge current during the specified time of discharge;
and determining the test temperature and the discharge internal resistance under the target voltage according to the target voltage, the tail end voltage and the discharge current.
Further, the method also comprises the step of determining the discharge power according to the target voltage, the discharge cut-off voltage and the discharge internal resistance.
Further, the target voltage is an open-circuit voltage of the battery corresponding to a specified SOC at the test temperature.
Further, the target voltage is included in a target voltage sequence;
after the discharging internal resistance corresponding to the current target voltage is determined, controlling the temperature to recover to the reference temperature, and controlling the battery to be charged to full charge by adopting the first charging rate;
and controlling the temperature to the test temperature, and re-determining the discharge internal resistance corresponding to the next target voltage in the target voltage sequence.
Further, the test temperature is included in a test temperature sequence;
after the discharging internal resistance corresponding to the current test temperature is determined, controlling the temperature to recover to the reference temperature, and controlling the battery to be charged to full charge by adopting the first charging rate;
and controlling the temperature to the next test temperature in the test temperature sequence, and re-determining the discharge internal resistance corresponding to the next test temperature in the test temperature sequence.
Further, the formula for calculating the discharge internal resistance is as follows:
DCR＝(V1-V0)/I
in the formula, V1Is the terminal voltage, V0I is the discharge current at the target voltage.
Further, the formula for calculating the discharge power is as follows:
P＝(V0-Vmin)×Vmin/DCR
in the formula, V0Is the target voltage, VminThe DCR is the discharge internal resistance as the discharge cutoff voltage.
Further, the first charge rate is 0.33C, the first discharge rate is 0.2C, and the second discharge rate is 2C-3C.
In a second aspect, an embodiment of the present invention further provides a battery cell testing apparatus, including a configuration unit, a regulation unit, and a calculation unit;
the configuration unit is configured to: receiving a test temperature, a reference temperature, a first charging multiplying factor, a first discharging multiplying factor, a second discharging multiplying factor and a target voltage;
the regulation and control unit is used for: controlling the temperature to the reference temperature, and controlling the battery to be fully charged by adopting the first charging rate;
controlling the temperature to the test temperature, controlling the battery to discharge by adopting the first discharge rate, detecting the voltage of the battery, and judging whether the voltage changes to the target voltage;
when the voltage reaches the target voltage, controlling to discharge the battery for a specified time by adopting the second discharge rate, recording the terminal voltage after the specified time of discharge, and recording the discharge current during the specified time of discharge;
the computing unit is to: and determining the test temperature and the discharge internal resistance under the target voltage according to the target voltage, the tail end voltage and the discharge current.
In a third aspect, an embodiment of the present invention further provides a battery cell testing system, which is configured with a controller, where the controller is configured with an executable program, and the executable program is used to implement the battery cell testing method described in the embodiment of the present invention when running.
Compared with the prior art, the invention has the beneficial effects that: the cell testing method provided by the invention controls the temperature to different testing temperatures in the testing process, measures the discharging internal resistance under the corresponding SOC at different testing temperatures, can obtain the functional relation between different temperatures and the discharging internal resistance of the battery, and is convenient for establishing a performance model of the battery; in the test process, the discharge process is divided into two discharge stages, the battery is discharged by adopting low current in the first discharge stage, and the battery is discharged by adopting high current in the second discharge stage, so that the output current in the practical application process is simulated as much as possible, and the reliability of the test result is improved.
Drawings
Fig. 1 is a flowchart of a cell testing method in the embodiment;
fig. 2 is a flowchart of another cell testing method in the embodiment;
fig. 3 is a flowchart of another cell testing method in the embodiment;
fig. 4 is a schematic diagram of a cell testing apparatus in an embodiment.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a flowchart of a cell testing method in an embodiment, and referring to fig. 1, the cell testing method includes:
s101, receiving a test temperature, a reference temperature, a first charging multiplying factor, a first discharging multiplying factor, a second discharging multiplying factor and a target voltage.
In this embodiment, the cell testing method is used to determine the internal discharge resistance of the battery to be tested at a certain testing temperature and a certain SOC, and before performing a single internal discharge resistance test, the testing conditions of this test are configured first.
In this embodiment, the reference temperature is an ambient temperature required for charging the battery, the battery charging process includes charging the battery to full charge, or charging the battery for a short time in the test process, so that the SOC of the battery reaches a certain value, and the reference temperature is 25 ℃ ± 2 ℃ for example;
the first charging rate is used for determining the magnitude of the charging current required when the battery is charged, and is illustratively 0.3C to 1C;
the test temperature is the ambient temperature required for discharging the battery;
the first discharge rate and the second discharge rate are used for determining the discharge current required by the battery in different discharge stages, and exemplarily, the first discharge rate is 0.1C-1C, and the second discharge rate is 2C-3C;
the target voltage corresponds to a specified SOC at a specified test temperature during a single test, and the target voltage is used for distinguishing different discharge stages during the test.
S102, controlling the temperature to be the reference temperature, and controlling the battery to be fully charged by adopting a first charging rate.
In this embodiment, the electric core test mainly aims at the discharge test, and in order to perform the discharge test, the battery is first charged to full charge, and whether the battery is fully charged or not may be determined according to the full capacity of the battery or the charge cut-off voltage of the battery.
For example, the full capacity of the battery may be determined by a constant volume method before the test, and the constant volume method is not particularly limited in this embodiment.
And S103, controlling the temperature to be the testing temperature, and controlling the battery to discharge by adopting the first discharge rate.
Illustratively, after the battery is charged to full charge, a discharge phase is performed, in which the ambient temperature is adjusted to a test temperature while the battery is discharged with a discharge current of a first discharge rate.
And S104, detecting the voltage of the battery, judging whether the voltage changes to a target voltage, controlling to discharge the battery for a specified time by adopting a second discharge rate when the voltage reaches the target voltage, recording the tail end voltage after the specified time of discharge, and recording the discharge current at the specified time of discharge.
For example, the designated time may be 10S to 40S.
Illustratively, in the present embodiment, the battery discharge is divided into two stages, and the next discharge stage (second discharge stage) is entered when the voltage of the battery reaches the target voltage.
Illustratively, after entering the second discharging stage, the battery is continuously discharged by adopting the discharging current with the second discharging rate, and when the discharging time length reaches the specified time, the second discharging stage is ended.
In this embodiment, the voltage of the battery at the end of the second discharge phase is recorded as the end voltage, and the discharge current of the second discharge phase is recorded at the same time.
And S105, determining the test temperature and the discharge internal resistance under the target voltage according to the target voltage, the tail end voltage and the discharge current.
As an implementable aspect, in this example, the internal discharge resistance is calculated by the following formula:
DCR＝(V1-V0)/I
in the formula, V1Is terminal voltage, V0I is the discharge current.
For example, the discharge resistance corresponding to one temperature value and one SOC, for example, the discharge internal resistance at 70% SOC at 10 ℃ may be determined through steps S101 to S105.
As an implementation, steps S101 to S105 may be performed cyclically, and the discharge resistances corresponding to different temperatures and different SOCs may be determined.
For example, when the loop is executed from S101 to S105, the target voltage may be included in the target voltage sequence;
and after the discharging internal resistance corresponding to the current target voltage is determined, the discharging internal resistance corresponding to the next target voltage in the target voltage sequence is determined again.
For example, the current test determines the internal discharge resistance at 10 ℃ and 70% SOC, and the next test may be performed by adjusting the target voltage to determine the internal discharge resistance at 10 ℃ and 60% SOC.
For example, when the loop is executed from S101 to S105, the test temperature may be included in the test temperature sequence, and the discharge internal resistance is determined to include;
and after the discharge internal resistance at the current test temperature is determined, selecting the next test temperature in the test temperature sequence, and re-determining the discharge internal resistance at the next test temperature.
For example, the current test determines the internal discharge resistance at 10 ℃ and 70% SOC, and the next test may be performed by adjusting the test temperature to determine the internal discharge resistance at 20 ℃ and 70% SOC.
For example, based on the target voltage sequence and the test temperature sequence, when the next test is performed, the test temperature and the target voltage may be adjusted at the same time, and the internal discharge resistance at the next test temperature and the next target voltage may be re-determined.
For example, the current test determines the internal discharge resistance at 10 ℃ and 70% SOC, and the next test may be performed by adjusting the test temperature and the target voltage to determine the internal discharge resistance at 30 ℃ and 50% SOC.
For example, in this embodiment, when the test temperature changes, the target voltage also changes correspondingly, and the determination manner of the target voltage is as follows:
determining the test temperature and the first discharge rate specified by a single test;
charging the battery to full charge at a reference temperature;
adjusting the temperature to a test temperature, discharging the battery by using the discharge current with the first discharge rate, and recording the open-circuit voltage of the battery under the specified SOC as a target voltage corresponding to the SOC at the test temperature;
for example, when the test temperature is 10 ℃, the battery is discharged by using a 0.2C discharge current, and the open-circuit voltage of the battery is recorded every time the SOC of the battery decreases by 10%, the target voltage corresponding to 90% SOC and 80%. 0% SOC at 10 ℃ can be obtained after the battery is discharged to the cut-off voltage.
The battery cell testing method provided by the embodiment controls the temperature to different testing temperatures in the testing process, measures the discharging internal resistance under the corresponding SOC at different testing temperatures, can obtain the functional relation between different temperatures and the discharging internal resistance of the battery, and is convenient for establishing a performance model of the battery;
in the test process, the discharge process is divided into two discharge stages, the battery is discharged by adopting low current in the first discharge stage, and the battery is discharged by adopting high current in the second discharge stage, so that the output current in the practical application process is simulated as much as possible, and the reliability of the test result is improved.
Fig. 2 is a flowchart of another cell testing method in the embodiment, and referring to fig. 2, the cell testing method may further include:
s201, receiving a test temperature, a reference temperature, a first charging multiplying factor, a first discharging multiplying factor, a second discharging multiplying factor and a target voltage.
S202, controlling the temperature to be the reference temperature, and controlling the battery to be fully charged by adopting a first charging rate.
S203, controlling the temperature to be the testing temperature, and controlling the battery to discharge by adopting the first discharge rate.
And S204, detecting the voltage of the battery, judging whether the voltage changes to a target voltage, controlling to discharge the battery for a specified time by adopting a second discharge rate when the voltage reaches the target voltage, recording the tail end voltage after the specified time of discharge, and recording the discharge current at the specified time of discharge.
And S205, determining the test temperature and the discharge internal resistance under the target voltage according to the target voltage, the tail end voltage and the discharge current.
Illustratively, the implementation of steps S201 to S205 is the same as the implementation of steps S101 to S105.
S206, determining the discharge power under the target voltage when the temperature is the test temperature according to the target voltage, the discharge cut-off voltage and the discharge internal resistance.
For example, in the present embodiment, the discharge cut-off voltage may be a battery discharge cut-off voltage calibrated at a reference temperature.
As an embodiment, in this embodiment, the discharge power is calculated by the following formula:
P＝(V0-Vmin)×Vmin/DCR
in the formula, V0Is the target voltage of this test, VminFor the discharge cutoff voltage, DCR is the discharge internal resistance determined by this test.
On the basis of the beneficial effects of the scheme shown in fig. 1, the scheme measures the discharge power performance under different temperature and SOC conditions, and can simulate the discharge power capability of the battery cell in the actual application process of the system as much as possible.
Fig. 3 is a flowchart of another cell testing method in the embodiment, and referring to fig. 3, the cell testing method may further include:
s301, receiving a test temperature, a reference temperature, a first charging multiplying factor, a first discharging multiplying factor, a second discharging multiplying factor and a target voltage sequence.
S302, controlling the temperature to be the reference temperature, and controlling the battery to be fully charged by adopting a first charging rate.
For example, in this embodiment, the embodiments of step S301 and step S302 are the same as those described in step S101 and step S102, except that the target voltage is changed to the target voltage sequence.
In this embodiment, the target voltage sequence records target voltages corresponding to different SOCs at the current test temperature.
For example, one target voltage sequence may include target voltages corresponding to 90%, 80%. 0% SOC at 10 ℃.
And S303, under the test temperature, aiming at each target voltage in the target voltage sequence, controlling the battery to be discharged to the target voltage by adopting a first discharge multiplying factor, controlling the battery to be discharged for a specified time by adopting a second discharge multiplying factor, and recording the terminal voltage corresponding to the target voltage.
For example, in the present embodiment, the SOC of the battery is detected during the discharging process, and if the SOC of the battery is smaller than the SOC corresponding to the next target voltage after the second stage of discharging for the current target voltage, the step S303 is performed according to the following steps:
assuming that in the target voltage sequence, two adjacent target voltages V8、V7The corresponding SOC is respectively 80% and 70%, and the battery is controlled to be discharged to the target voltage V by adopting the first discharge rate under the test temperature8；
The battery voltage reaches V8Then, the battery is controlled to be discharged for a specified time by adopting a second discharge rate, and the target voltage V is recorded8Corresponding end voltage Vm8；
Adjusting the temperature to a reference temperature, and controlling to charge the battery to 75% SOC by adopting a first charging rate;
adjusting the temperature to a test temperature, and controlling the battery to discharge to a target voltage V by adopting a first discharge rate7；
The battery voltage reaches V7Then, the battery is controlled to be discharged for a specified time by adopting a second discharge rate, and the target voltage V is recorded7Corresponding toEnd voltage Vm7。
If the SOC of the battery is greater than the SOC corresponding to the next target voltage after the second stage of discharging with respect to the current target voltage, step S303 is performed according to the following steps:
assuming that in the target voltage sequence, two adjacent target voltages V6、V5The corresponding SOC is 60% and 50%, respectively, and the battery is controlled to be discharged to the target voltage V by adopting the first discharge rate under the test temperature6；
The battery voltage reaches V6Then, the battery is controlled to be discharged for a specified time by adopting a second discharge rate, and the target voltage V is recorded6Corresponding end voltage Vm6；
Controlling the battery to discharge to a target voltage V with a first discharge rate5；
The battery voltage reaches V5Then, the battery is controlled to be discharged for a specified time by adopting a second discharge rate, and the target voltage V is recorded5Corresponding end voltage Vm5。
S304, determining the discharging internal resistance corresponding to each target voltage at the test temperature according to each target voltage, the tail end voltage corresponding to the current target voltage and the discharging current in sequence.
For example, in the present embodiment, the manner of calculating the discharge internal resistance corresponding to each target voltage is the same as that described in step S105.
On the basis of the beneficial effects of the scheme shown in fig. 1, in the test process of the scheme, the SOC of the battery cell continuously changes, the battery cell is in the dynamic discharge process, and the discharge performance of the battery under the actual application scene can be more intuitively simulated.
Example two
Fig. 4 is a schematic diagram of a cell testing apparatus in an embodiment, and referring to fig. 4, the embodiment provides a cell testing apparatus, which includes a configuration unit 100, a regulation unit 200, and a calculation unit 300.
The configuration unit 100 is configured to: receiving a test temperature, a reference temperature, a first charging rate, a first discharging rate, a second discharging rate and a target voltage.
The regulatory unit 200 is used to: controlling the temperature to be the reference temperature, and controlling the battery to be fully charged by adopting a first charging rate;
controlling the temperature to be the test temperature, discharging the battery by adopting a first discharge rate, detecting the voltage of the battery, and judging whether the voltage changes to a target voltage;
and when the voltage reaches the target voltage, controlling to discharge the battery for a specified time by adopting a second discharge rate, recording the terminal voltage after the specified time of discharge, and recording the discharge current at the specified time of discharge.
The computing unit 300 is configured to: and determining the discharge internal resistance under the target voltage when the temperature is the test temperature according to the target voltage, the terminal voltage and the discharge current.
For example, the cell testing apparatus may implement the cell testing method shown in fig. 1.
For example, the calculating unit 300 may be further configured to determine, according to the target voltage, the discharge cut-off voltage, and the discharge internal resistance, the discharge power at the target voltage when the temperature is the test temperature, and accordingly, the cell testing apparatus may implement the cell testing scheme shown in fig. 2.
Illustratively, the configuration unit 100 may further be configured to: and receiving a test temperature, a reference temperature, a first charging multiplying factor, a first discharging multiplying factor, a second discharging multiplying factor and a target voltage sequence.
The regulatory unit 200 may also be used to: controlling the temperature to be the reference temperature, and controlling the battery to be fully charged by adopting a first charging rate;
and under the test temperature, for each target voltage in the target voltage sequence, controlling the battery to be discharged to the target voltage by adopting a first discharge rate, controlling the battery to be discharged for a specified time by adopting a second discharge rate, and recording the terminal voltage corresponding to the target voltage.
The computing unit 300 may also be configured to: and determining the discharge internal resistance corresponding to each target voltage at the test temperature according to each target voltage, the tail end voltage corresponding to the current target voltage and the discharge current in sequence.
Correspondingly, the cell testing apparatus may implement the cell testing scheme shown in fig. 3.
In this embodiment, the beneficial effects of the battery cell testing device are the same as the corresponding beneficial effects recorded in the first embodiment.
EXAMPLE III
The cell testing method provided in the first embodiment may be implemented in a software manner, and the first embodiment provides a cell testing system configured with a controller.
The controller is configured with an executable program, and the executable program is used for implementing any one of the cell testing methods described in the first embodiment when the executable program is executed.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (10)

1. A cell testing method is characterized by comprising the following steps: receiving a test temperature, a reference temperature, a first charging multiplying factor, a first discharging multiplying factor, a second discharging multiplying factor and a target voltage;
controlling the temperature to the reference temperature, and controlling the battery to be fully charged by adopting the first charging rate;
controlling the temperature to the test temperature, controlling the battery to discharge by adopting the first discharge rate, detecting the voltage of the battery, and judging whether the voltage changes to the target voltage;
when the voltage of the battery reaches the target voltage, controlling to discharge the battery for a specified time by adopting the second discharge rate, recording the terminal voltage after the specified time of discharge, and recording the discharge current during the specified time of discharge;
and determining the test temperature and the discharge internal resistance under the target voltage according to the target voltage, the tail end voltage and the discharge current.
2. The cell testing method of claim 1, further comprising determining a discharge power according to the target voltage, a discharge cutoff voltage, and the discharge internal resistance.
3. The cell testing method of claim 1, wherein the target voltage is an open circuit voltage of the battery corresponding to a specified SOC at the test temperature.
4. The cell testing method of claim 1, wherein the target voltage is included in a sequence of target voltages;
after the discharging internal resistance corresponding to the current target voltage is determined, controlling the temperature to recover to the reference temperature, and controlling the battery to be charged to full charge by adopting the first charging rate;
and controlling the temperature to the test temperature, and re-determining the discharge internal resistance corresponding to the next target voltage in the target voltage sequence.
5. The cell testing method of claim 1, wherein the test temperature is included in a sequence of test temperatures;
after the discharging internal resistance corresponding to the current test temperature is determined, controlling the temperature to recover to the reference temperature, and controlling the battery to be charged to full charge by adopting the first charging rate;
and controlling the temperature to the next test temperature in the test temperature sequence, and re-determining the discharge internal resistance corresponding to the next test temperature in the test temperature sequence.
6. The electrical core testing method of claim 1, wherein the formula for calculating the internal discharge resistance is as follows:
DCR＝(V1-V0)/I
in the formula, V1Is the terminal voltage, V0I is the discharge current at the target voltage.
7. The cell testing method of claim 2, wherein the formula for calculating the discharge power is:
P＝(V0-Vmin)×Vmin/DCR
in the formula, V0Is the target voltage, VminThe DCR is the discharge internal resistance as the discharge cutoff voltage.
8. The battery cell testing method of claim 1, wherein the first charge rate is 0.33C, the first discharge rate is 0.2C, and the second discharge rate is 2C-3C.
9. The battery cell testing device is characterized by comprising a configuration unit, a regulation and control unit and a calculation unit;
the configuration unit is configured to: receiving a test temperature, a reference temperature, a first charging multiplying factor, a first discharging multiplying factor, a second discharging multiplying factor and a target voltage;
the regulation and control unit is used for: controlling the temperature to the reference temperature, and controlling the battery to be fully charged by adopting the first charging rate;
controlling the temperature to the test temperature, controlling the battery to discharge by adopting the first discharge rate, detecting the voltage of the battery, and judging whether the voltage changes to the target voltage;
when the voltage reaches the target voltage, controlling to discharge the battery for a specified time by adopting the second discharge rate, recording the terminal voltage after the specified time of discharge, and recording the discharge current during the specified time of discharge;
the computing unit is to: and determining the test temperature and the discharge internal resistance under the target voltage according to the target voltage, the tail end voltage and the discharge current.
10. A cell testing system, characterized by being configured with a controller configured with an executable program that when executed is configured to implement the cell testing method of any of claims 1 to 8.
CN202110885909.XA 2021-08-03 2021-08-03 Battery cell testing method, device and system Active CN113504477B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110885909.XA CN113504477B (en) 2021-08-03 2021-08-03 Battery cell testing method, device and system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110885909.XA CN113504477B (en) 2021-08-03 2021-08-03 Battery cell testing method, device and system

Publications (2)

Publication Number Publication Date
CN113504477A true CN113504477A (en) 2021-10-15
CN113504477B CN113504477B (en) 2022-10-14

Family

ID=78014877

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110885909.XA Active CN113504477B (en) 2021-08-03 2021-08-03 Battery cell testing method, device and system

Country Status (1)

Country Link
CN (1) CN113504477B (en)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060186890A1 (en) * 2003-06-27 2006-08-24 The Furukawa Electric Co, Ltd. Method for determining deterioration of accumulator battery, method for measuring internal impedance of secondary battery, equipment for measuring internal impedance of secondary battery, equipment for determining deterioration of secondary battery, and power supply system
US20120004875A1 (en) * 2010-06-30 2012-01-05 Reizo Maeda Method of detecting battery internal resistance
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
CN104607395A (en) * 2013-11-01 2015-05-13 北汽福田汽车股份有限公司 lithium ion battery sorting method
CN108254693A (en) * 2017-12-12 2018-07-06 多氟多（焦作）新能源科技有限公司 It is a kind of to select the big method of lithium ion battery self discharge
CN108614218A (en) * 2018-04-19 2018-10-02 中国科学院广州能源研究所 A kind of continuous method for measuring lithium ion battery dynamic internal resistance
CN111308163A (en) * 2020-02-21 2020-06-19 天津力神电池股份有限公司 Method for determining pulse discharge maximum current of lithium ion power battery
CN111624504A (en) * 2020-06-04 2020-09-04 奇瑞商用车（安徽）有限公司 Direct current internal resistance testing method for lithium ion battery

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060186890A1 (en) * 2003-06-27 2006-08-24 The Furukawa Electric Co, Ltd. Method for determining deterioration of accumulator battery, method for measuring internal impedance of secondary battery, equipment for measuring internal impedance of secondary battery, equipment for determining deterioration of secondary battery, and power supply system
US20120004875A1 (en) * 2010-06-30 2012-01-05 Reizo Maeda Method of detecting battery internal resistance
CN104607395A (en) * 2013-11-01 2015-05-13 北汽福田汽车股份有限公司 lithium ion battery sorting method
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
CN108254693A (en) * 2017-12-12 2018-07-06 多氟多（焦作）新能源科技有限公司 It is a kind of to select the big method of lithium ion battery self discharge
CN108614218A (en) * 2018-04-19 2018-10-02 中国科学院广州能源研究所 A kind of continuous method for measuring lithium ion battery dynamic internal resistance
CN111308163A (en) * 2020-02-21 2020-06-19 天津力神电池股份有限公司 Method for determining pulse discharge maximum current of lithium ion power battery
CN111624504A (en) * 2020-06-04 2020-09-04 奇瑞商用车（安徽）有限公司 Direct current internal resistance testing method for lithium ion battery

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
刘仕强 等: "磷酸铁锂动力电池备电工况寿命试验研究及分析", 《储能科学与技术》 *
阮晓莉等: "储能用钛酸锂体系电池直流内阻测试分析", 《东方电气评论》 *

Also Published As

Publication number Publication date
CN113504477B (en) 2022-10-14

Similar Documents

Publication Publication Date Title
CN109586373B (en) Battery charging method and device
CN109596983B (en) Method for predicting capacity water jump in battery aging process
CN112798966B (en) Method and device for estimating remaining battery charging time, storage medium and electronic equipment
EP3664247A1 (en) Charging time computation method and charge control device
US10553913B2 (en) Battery apparatus, charging control apparatus, and charging control method
CN107204493B (en) Battery charging method, device and equipment
CN111175661A (en) Method and system for determining state of charge of lithium ion battery
US10054645B2 (en) Deterioration determination method, deterioration determination device, and storage medium
WO2015141580A1 (en) Secondary battery internal temperature estimation device and secondary battery internal temperature estimation method
US20190339332A1 (en) Battery pack and power supply system
CN113364068A (en) Charging management method and battery pack
US20200006960A1 (en) Charging device and method thereof
CN111624491A (en) Method and device for determining residual electric quantity of battery and battery management system
CN113504477B (en) Battery cell testing method, device and system
CN116865388A (en) Method and device for formulating quick charge strategy and electronic equipment
JP3503295B2 (en) Charge control method and device for assembled battery
CN113504476B (en) Power battery peak power testing method, device and system
CN116381499A (en) Method and device for predicting multiple peak power performance parameters of storage battery
CN111638460B (en) Battery testing apparatus, system and method
Li et al. An electrical model capable of estimating the state of energy for lithium-ion batteries used in energy storage systems
KR20160046220A (en) Apparatus for Cell Balancing by Connecting Reference Battery in Consecutive Order and Method thereof
JP2004014231A (en) Charging rate estimation device for secondary battery
CN114189013A (en) Charging device, charging method and computer readable storage medium
CN113466714A (en) Lithium battery self-discharge rate evaluation method and device and computer equipment
CN113270656A (en) Method for determining the aging state of at least one electrical energy storage unit

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant