CN103543410A - System and method for detecting low-temperature charge and discharge performance of energy-type power lithium ion battery in high and cold area - Google Patents

System and method for detecting low-temperature charge and discharge performance of energy-type power lithium ion battery in high and cold area Download PDF

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CN103543410A
CN103543410A CN201310531211.3A CN201310531211A CN103543410A CN 103543410 A CN103543410 A CN 103543410A CN 201310531211 A CN201310531211 A CN 201310531211A CN 103543410 A CN103543410 A CN 103543410A
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battery
charging
ion battery
type power
energy type
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CN103543410B (en
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武国良
徐冰亮
董尔佳
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Heilongjiang Electric Power Co Ltd
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Heilongjiang Electric Power Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
    • 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]
    • G01R31/367—Software therefor, e.g. for battery testing using modelling or look-up tables
    • 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]
    • G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • 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

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  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention discloses a system and method for detecting the low-temperature charge and discharge performance of an energy-type power lithium ion battery in a high and cold area, and relates to the field of detection of the low-temperature charge and discharge performance of the energy-type power lithium ion battery. The system and method aim to solve the problem that in the prior art, a test on the low-temperature charge and discharge performance of the energy-type power lithium ion battery under the situation with low temperature is not accurate. The system comprises a low temperature constant temperature box, a battery charge and discharge testing device and a battery performance testing device. The battery performance testing device controls the battery charge and discharge testing device to carry out an nC multiplying power charge and discharge test on an energy-type power lithium ion battery to be detected, according to the obtained voltage, the obtained current, the obtained temperature and the obtained charge time and discharge time, a value obtained after dividing the calculated charge capacity of the battery to be detected by the rated capacity of the battery to be detected is calculated, namely, the determination coefficient of the nC multiplying power charge capacity of the battery to be detected is calculated, and n is a positive number smaller than or equal to two. The system and method are used for detecting the charge and discharge performance of the energy-type power lithium ion battery under the low-temperature environment.

Description

Extremely frigid zones energy type power lithium-ion battery low temperature charge-discharge performance detection system and method
Technical field
The present invention relates to energy type power lithium-ion battery low temperature charge-discharge performance field tests, particularly a kind of extremely frigid zones energy type power lithium-ion battery low temperature charge-discharge performance detection system and method.
Background technology
Pure electric automobile adopts energy type power lithium-ion battery, in the whole process of running car, uses.
Energy-accumulating power station is selected power-type power lithium-ion battery or energy type power lithium-ion battery according to electrical network demand.Long-time, continue output or input under high-octane demand, selecting energy type power lithium-ion battery.
Energy type power lithium-ion battery charge-discharge characteristic test main consideration normal temperature and the higher temperature state of electric automobile and energy-accumulating power station, corresponding test macro and method also lay particular emphasis on normal temperature and higher temperature state.Energy type power lithium-ion battery is along with the reduction of temperature, and the charging ability of battery and discharge capability all decline obviously.
Summary of the invention
The object of the invention is at present under low temperature condition, energy type power lithium-ion battery to be carried out to charge-discharge characteristic and test inaccurate problem in order to solve, the invention provides a kind of extremely frigid zones energy type power lithium-ion battery low temperature charge-discharge performance detection system and method.
Extremely frigid zones energy type power lithium-ion battery low temperature charge-discharge performance detection system of the present invention,
It comprises cryostat, battery charging and discharging proving installation and battery performance test device;
Energy type power lithium-ion battery to be measured is arranged in cryostat,
The discharge signal output terminal of battery charging and discharging proving installation is connected with the discharge signal input end of energy type power lithium-ion battery to be measured, and the charging signals output terminal of energy type power lithium-ion battery to be measured is connected with the charging signals input end of battery charging and discharging proving installation;
The battery voltage signal output terminal of battery charging and discharging proving installation is connected with the battery voltage signal output terminal of battery performance test device; The battery current signal output part of battery charging and discharging proving installation is connected with the battery current signal input part of battery performance test device; The battery temperature signal output part of battery charging and discharging proving installation is connected with the battery temperature signal input part of battery performance test device; The battery duration of charging signal output part of battery charging and discharging proving installation is connected with the battery duration of charging signal input part of battery performance test device; The battery discharge time signal output part of battery charging and discharging proving installation is connected with the battery discharge time signal input part of battery performance test device;
The nC multiplying power charging current control signal output terminal of battery performance test device is connected with the nC multiplying power charging current control signal input end of battery charging and discharging proving installation;
The nC multiplying power discharging current controling signal output terminal of battery performance test device is connected with the nC multiplying power discharging current controling signal input end of battery charging and discharging proving installation;
Battery performance test device is embedded in the test module that software is realized, and described test module comprises charging performance test cell and discharge performance test cell;
Described charging performance test cell comprises as lower module:
For sending the module of nC multiplying power charging current control signal; N is less than or equal to 2 positive number;
For receiving the module of the duration of charging signal of the voltage signal of mesuring battary, the temperature signal of the current signal of mesuring battary, mesuring battary and mesuring battary;
For the voltage signal when reception while reaching the upper voltage limit of tested battery, calculate the module of constant current value of the current signal of duration of charging and reception simultaneously;
Be used for according to the module of the charging capacity of the duration of charging calculating and constant current value calculating mesuring battary simultaneously;
For the charging capacity of the mesuring battary calculating is obtained to the module of the nC multiplying power charging ability coefficient of determination of mesuring battary divided by the rated capacity of mesuring battary;
For showing the module of temperature signal with the nC multiplying power charging ability coefficient of determination of the mesuring battary calculating of reception;
Described discharge performance test cell comprises as lower module:
For sending the module of nC multiplying power discharging current controling signal; N is less than or equal to 2 positive number;
For receiving the voltage signal of mesuring battary, the module of the temperature signal of the current signal of mesuring battary, mesuring battary and the discharge time signal of mesuring battary;
For the voltage signal when reception while reaching the lower voltage limit of tested battery, calculate the module of constant current value of the current signal of discharge time and reception simultaneously;
Be used for according to the module of the discharge capacity of the discharge time calculating and constant current value calculating mesuring battary simultaneously;
For the discharge capacity of the mesuring battary calculating is obtained to the module of the nC multiplying power discharging ability coefficient of determination of mesuring battary divided by the rated capacity of mesuring battary;
For showing the module of temperature signal with the nC multiplying power discharging ability coefficient of determination of the mesuring battary calculating of reception.
The detection method of extremely frigid zones energy type power lithium-ion battery low temperature charge-discharge performance detection system,
Step 1: under 25 degree room temperature conditions, energy type power lithium-ion battery to be measured is carried out to 1/3C multiplying power discharging to lower voltage limit;
Step 2: under 25 degree room temperature conditions, by standing 1 hour of energy type power lithium-ion battery to be measured after electric discharge;
Step 3: cryostat is adjusted under the cryogenic temperature of need measuring, and the energy type power lithium-ion battery to be measured after static 1 hour was placed in described cryostat after 10 hours, proceed to step 4;
Step 4: the battery charging and discharging proving installation and the battery performance test device that start described extremely frigid zones energy type power lithium-ion battery low temperature charge-discharge performance detection system, carry out nC multiplying power charging measurement, battery performance test device shows nC multiplying power charging ability coefficient of determination and the temperature of mesuring battary, obtains the nC multiplying power charging ability coefficient of determination at described temperature of energy type power lithium-ion battery to be measured that is:;
Described charging performance detection method comprises the steps:
Step 5: under 25 degree room temperature conditions, energy type power lithium-ion battery to be measured is carried out to 1/3C multiplying power and charge to upper voltage limit; Step 6: under 25 degree room temperature conditions, by standing 1 hour of energy type power lithium-ion battery to be measured after charging;
Step 7: cryostat is adjusted under the cryogenic temperature of need measuring, and the energy type power lithium-ion battery to be measured after static 1 hour was placed in described cryostat after 10 hours, proceed to step 8;
Step 8: the battery charging and discharging proving installation and the battery performance test device that start described extremely frigid zones energy type power lithium-ion battery low temperature charge-discharge performance detection system, carry out the test of nC multiplying power discharging, nC multiplying power discharging ability coefficient of determination and the temperature of the mesuring battary that battery performance test device shows, that is: the nC multiplying power discharging ability coefficient of determination of acquisition energy type power lithium-ion battery to be measured at described temperature; Described n is less than or equal to 2 positive number.
The invention has the advantages that, the invention provides energy type power lithium-ion battery charge-discharge performance detection system and detection method under low temperature environment, at extremely frigid zones detected energy type power lithium-ion battery charging ability and discharge capability, thereby evaluate the requirement whether energy type power lithium-ion battery meets pure electric automobile under low temperature environment or energy-accumulating power station.
Accompanying drawing explanation
Fig. 1 is the principle schematic of the extremely frigid zones energy type power lithium-ion battery low temperature charge-discharge performance detection system described in embodiment one.
Embodiment
Embodiment one: present embodiment is described in conjunction with Fig. 1, extremely frigid zones energy type power lithium-ion battery low temperature charge-discharge performance detection system described in present embodiment, it comprises cryostat 1, battery charging and discharging proving installation 2 and battery performance test device 3;
Energy type power lithium-ion battery to be measured is arranged in cryostat 1,
The discharge signal output terminal of battery charging and discharging proving installation 2 is connected with the discharge signal input end of energy type power lithium-ion battery to be measured, and the charging signals output terminal of energy type power lithium-ion battery to be measured is connected with the charging signals input end of battery charging and discharging proving installation 2;
The battery voltage signal output terminal of battery charging and discharging proving installation 2 is connected with the battery voltage signal output terminal of battery performance test device 3; The battery current signal output part of battery charging and discharging proving installation 2 is connected with the battery current signal input part of battery performance test device 3; The battery temperature signal output part of battery charging and discharging proving installation 2 is connected with the battery temperature signal input part of battery performance test device 3; The battery duration of charging signal output part of battery charging and discharging proving installation 2 is connected with the battery duration of charging signal input part of battery performance test device 3; The battery discharge time signal output part of battery charging and discharging proving installation 2 is connected with the battery discharge time signal input part of battery performance test device 3;
The nC multiplying power charging current control signal output terminal of battery performance test device 3 is connected with the nC multiplying power charging current control signal input end of battery charging and discharging proving installation 2;
The nC multiplying power discharging current controling signal output terminal of battery performance test device 3 is connected with the nC multiplying power discharging current controling signal input end of battery charging and discharging proving installation 2;
Battery performance test device 3 is embedded in the test module that software is realized, and described test module comprises charging performance test cell and discharge performance test cell;
Described charging performance test cell comprises as lower module:
For sending the module of nC multiplying power charging current control signal; N is less than or equal to 2 positive number;
For receiving the module of the duration of charging signal of the voltage signal of mesuring battary, the temperature signal of the current signal of mesuring battary, mesuring battary and mesuring battary;
For the voltage signal when reception while reaching the upper voltage limit of tested battery, calculate the module of constant current value of the current signal of duration of charging and reception simultaneously;
Be used for according to the module of the charging capacity of the duration of charging calculating and constant current value calculating mesuring battary simultaneously;
For the charging capacity of the mesuring battary calculating is obtained to the module of the nC multiplying power charging ability coefficient of determination of mesuring battary divided by the rated capacity of mesuring battary;
For showing the module of temperature signal with the nC multiplying power charging ability coefficient of determination of the mesuring battary calculating of reception;
Described discharge performance test cell comprises as lower module:
For sending the module of nC multiplying power discharging current controling signal; N is less than or equal to 2 positive number;
For receiving the voltage signal of mesuring battary, the module of the temperature signal of the current signal of mesuring battary, mesuring battary and the discharge time signal of mesuring battary;
For the voltage signal when reception while reaching the lower voltage limit of tested battery, calculate the module of constant current value of the current signal of discharge time and reception simultaneously;
Be used for according to the module of the discharge capacity of the discharge time calculating and constant current value calculating mesuring battary simultaneously;
For the discharge capacity of the mesuring battary calculating is obtained to the module of the nC multiplying power discharging ability coefficient of determination of mesuring battary divided by the rated capacity of mesuring battary;
For showing the module of temperature signal with the nC multiplying power discharging ability coefficient of determination of the mesuring battary calculating of reception.
In present embodiment, cryostat 1 effect is, for power lithium-ion battery provides low temperature environment.Battery charging and discharging proving installation carries out charging and discharging to battery, and gather cell voltage, electric current, temperature, duration of charging and discharge time parameter.
Battery performance test device carries out communication by 485 buses or CAN bus and battery charging and discharging proving installation, and battery charging and discharging proving installation will collect parameter and pass to battery performance test device.
Battery performance test device calculates charging capacity and the discharge capacity of battery by software, capacitation coefficient of determination, the quality of evaluation battery charging ability and discharge capability.
Embodiment two: present embodiment is the detection method of the extremely frigid zones energy type power lithium-ion battery low temperature charge-discharge performance detection system described in embodiment one,
Step 1: under 25 degree room temperature conditions, energy type power lithium-ion battery to be measured is carried out to 1/3C multiplying power discharging to lower voltage limit;
Step 2: under 25 degree room temperature conditions, by standing 1 hour of energy type power lithium-ion battery to be measured after electric discharge;
Step 3: cryostat 1 is adjusted under the cryogenic temperature that needs to measure, and the energy type power lithium-ion battery to be measured after static 1 hour is placed on to described cryostat 1 after interior 10 hours, proceed to step 4;
Step 4: the battery charging and discharging proving installation 2 and the battery performance test device 3 that start described extremely frigid zones energy type power lithium-ion battery low temperature charge-discharge performance detection system, carry out nC multiplying power charging measurement, battery performance test device 3 shows nC multiplying power charging ability coefficient of determination and the temperature of mesuring battary, obtains the nC multiplying power charging ability coefficient of determination at described temperature of energy type power lithium-ion battery to be measured that is:;
Described charging performance detection method comprises the steps:
Step 5: under 25 degree room temperature conditions, energy type power lithium-ion battery to be measured is carried out to 1/3C multiplying power and charge to upper voltage limit; Step 6: under 25 degree room temperature conditions, by standing 1 hour of energy type power lithium-ion battery to be measured after charging;
Step 7: cryostat 1 is adjusted under the cryogenic temperature that needs to measure, and the energy type power lithium-ion battery to be measured after static 1 hour is placed on to described cryostat 1 after interior 10 hours, proceed to step 8;
Step 8: the battery charging and discharging proving installation 2 and the battery performance test device 3 that start described extremely frigid zones energy type power lithium-ion battery low temperature charge-discharge performance detection system, carry out the test of nC multiplying power discharging, nC multiplying power discharging ability coefficient of determination and the temperature of the mesuring battary that battery performance test device 3 shows, that is: the nC multiplying power discharging ability coefficient of determination of acquisition energy type power lithium-ion battery to be measured at described temperature; Described n is less than or equal to 2 positive number.
The detection method of described extremely frigid zones energy type power lithium-ion battery low temperature charge-discharge performance detection system in actual applications, according to the nC multiplying power discharging ability coefficient of determination of the mesuring battary obtaining, the performance of energy type power lithium-ion battery to be measured is judged, decision process is:
When n equals 1/3C, temperature is respectively 0 ℃ ,-10 ℃ ,-15 ℃ ,-20 ℃ and-25 ℃;
In described step 4 according to the nC multiplying power charging ability coefficient of determination of the mesuring battary showing and method that temperature is judged the charging ability of energy type power lithium-ion battery to be measured as:
When charging performance is tested, record the charging capacity C of mesuring battary nC_T_C, wherein nC represents multiplying power, T representation temperature, and C represents charging; 1/3C multiplying power low temperature charging experiment:
1)T1=0℃,
Energy type power lithium-ion battery, under the temperature conditions of T1=0 ℃, is carried out to 1/3C multiplying power charging experiment, charge to upper voltage limit, record charging capacity C 1/3C_0 ℃ _ C;
2)T2=-10℃,
Energy type power lithium-ion battery, under the temperature conditions of T1=-10 ℃, is carried out to 1/3C multiplying power charging experiment, charge to upper voltage limit, record charging capacity C 1/3C_-10 ℃ _ C;
3)T3=-15℃,
Energy type power lithium-ion battery, under the temperature conditions of T1=-15 ℃, is carried out to 1/3C multiplying power charging experiment, charge to upper voltage limit, record charging capacity C 1/3C_-15 ℃ _ C;
4)T4=-20℃,
Energy type power lithium-ion battery, under the temperature conditions of T1=-20 ℃, is carried out to 1/3C multiplying power charging experiment, charge to upper voltage limit, record charging capacity C 1/3C_-20 ℃ _ C;
5)T5=-25℃,
Energy type power lithium-ion battery, under the temperature conditions of T1=-25 ℃, is carried out to 1/3C multiplying power charging experiment, charge to upper voltage limit, record charging capacity C 1/3C_-25 ℃ _ C.
Calculate charging capacity and rated capacity ratio, obtain 1/3C multiplying power charging ability coefficient of determination η nC_T_C(C nC_T_C/ C nom):
1) at calculating T1=0 ℃, 1/3C multiplying power charging ability coefficient of determination, η 1/3C_0 ℃ _ C=C 1/3C_0 ℃ _ C/ C nom;
2) calculate T2=-10 ℃, 1/3C multiplying power charging ability coefficient of determination, η 1/3C_-10 ℃ _ C=C 1/3C_-10 ℃ _ C/ C nom;
3) calculate T3=-15 ℃, 1/3C multiplying power charging ability coefficient of determination, η 1/3C_-15 ℃ _ C=C 1/3C_-15 ℃ _ C/ C nom;
4) calculate T4=-20 ℃, 1/3C multiplying power charging ability coefficient of determination, η 1/3C_-20 ℃ _ C=C 1/3C_-20 ℃ _ C/ C nom;
5) calculate T5=-25 ℃, 1/3C multiplying power charging ability coefficient of determination, η 1/3C_-25 ℃ _ C=C 1/3C_-25 ℃ _ C/ C nom.
Work as η 1/3C_0 ℃ _ Cduring >96%, judge that the charging ability of energy type power lithium-ion battery to be measured is good;
As 81%< η 1/3C_0 ℃ _ Cduring <96%, judge that the charging ability of energy type power lithium-ion battery to be measured is medium;
Work as η 1/3C_0 ℃ _ Cduring <81%, judge that the charging ability of energy type power lithium-ion battery to be measured is poor;
Described η 1/3C_0 ℃ _ Cfor the 1/3C multiplying power charging ability coefficient of determination at 0 ℃ of temperature;
Work as η 1/3C_-10 ℃ _ Cduring >91%, judge that the charging ability of energy type power lithium-ion battery to be measured is good;
As 76%< η 1/3C_-10 ℃ _ Cduring <91%, judge that the charging ability of energy type power lithium-ion battery to be measured is medium;
Work as η 1/3C_-10 ℃ _ Cduring <76%, judge that the charging ability of energy type power lithium-ion battery to be measured is poor;
Described η 1/3C_-10 ℃ _ Cfor the 1/3C multiplying power charging ability coefficient of determination at temperature-10 ℃;
Work as η 1/3C_-15 ℃ _ Cduring >86%, judge that the charging ability of energy type power lithium-ion battery to be measured is good;
As 71%< η 1/3C_-15 ℃ _ Cduring <86%, judge that the charging ability of energy type power lithium-ion battery to be measured is medium;
Work as η 1/3C_-15 ℃ _ Cduring <71%, judge that the charging ability of energy type power lithium-ion battery to be measured is poor;
Described η 1/3C_-15 ℃ _ Cfor the 1/3C multiplying power charging ability coefficient of determination at temperature-15 ℃;
Work as η 1/3C_-20 ℃ _ Cduring >81%, judge that the charging ability of energy type power lithium-ion battery to be measured is good;
As 66%< η 1/3C_-20 ℃ _ C<81%, judges that the charging ability of energy type power lithium-ion battery to be measured is medium;
Work as η 1/3C_-20 ℃ _ Cduring <66%, judge that the charging ability of energy type power lithium-ion battery to be measured is poor;
Described η 1/3C_-20 ℃ _ Cfor the 1/3C multiplying power charging ability coefficient of determination at temperature-20 ℃;
Work as η 1/3C_-25 ℃ _ Cduring >76%, judge that the charging ability of energy type power lithium-ion battery to be measured is good;
As 61%< η 1/3C_-25 ℃ _ Cduring <76%, judge that the charging ability of energy type power lithium-ion battery to be measured is medium;
Work as η 1/3C_-25 ℃ _ Cduring <61%, judge that the charging ability of energy type power lithium-ion battery to be measured is poor;
Described η 1/3C_-25 ℃ _ Cfor the 1/3C multiplying power charging ability coefficient of determination at temperature-25 ℃.
When n equals 1/3C, temperature is respectively 0 ℃ ,-10 ℃ ,-15 ℃ ,-20 ℃ and-25 ℃;
In described step 8 according to the nC multiplying power discharging ability coefficient of determination of the mesuring battary showing and method that temperature is judged the discharge capability of energy type power lithium-ion battery to be measured as:
Record the charging capacity C of mesuring battary nC_T_D, wherein nC represents multiplying power, T representation temperature, and D represents electric discharge; The test of 1/3C multiplying power low temperature discharge:
1)T1=0℃,
Energy type power lithium-ion battery, under the temperature conditions of T1=0 ℃, is carried out to the experiment of 1/3C multiplying power discharging, be discharged to cut-off voltage, record discharge capacity C 1/3C_0 ℃ _ D.
2)T2=-10℃,
Energy type power lithium-ion battery, under the temperature conditions of T1=-10 ℃, is carried out to the experiment of 1/3C multiplying power discharging, be discharged to cut-off voltage, record discharge capacity C 1/3C_-10 ℃ _ D.
3)T3=-15℃,
Energy type power lithium-ion battery, under the temperature conditions of T1=-15 ℃, is carried out to the experiment of 1/3C multiplying power discharging, be discharged to cut-off voltage, record discharge capacity C 1/3C_-15 ℃ _ D.
4)T4=-20℃,
Energy type power lithium-ion battery, under the temperature conditions of T1=-20 ℃, is carried out to the experiment of 1/3C multiplying power discharging, be discharged to cut-off voltage, record discharge capacity C 1/3C_-20 ℃ _ D.
5)T5=-25℃,
Energy type power lithium-ion battery, under the temperature conditions of T1=-25 ℃, is carried out to the experiment of 1/3C multiplying power discharging, be discharged to cut-off voltage, record discharge capacity C 1/3C_-25 ℃ _ D.
Calculate discharge capacity and rated capacity ratio, obtain discharge capability coefficient of determination η nC_T_D(C nC_T_D/ C nom)
1) at calculating T1=0 ℃, 1/3C multiplying power discharging ability coefficient of determination, η 1/3C_0 ℃ _ D=C 1/3C_0 ℃ _ D/ C nom.
2) at calculating T2=-10 ℃, 1/3C multiplying power discharging ability coefficient of determination, η 1/3C_-10 ℃ _ D=C 1/3C_-10 ℃ _ D/ C nom.
3) at calculating T3=-15 ℃, 1/3C multiplying power discharging ability coefficient of determination, η 1/3C_-15 ℃ _ D=C 1/3C_-15 ℃ _ D/ C nom.
4) at calculating T4=-20 ℃, 1/3C multiplying power discharging ability coefficient of determination, η 1/3C_-20 ℃ _ D=C 1/3C_-20 ℃ _ D/ C nom.
5) at calculating T5=-25 ℃, 1/3C multiplying power discharging ability coefficient of determination, η 1/3C_-25 ℃ _ D=C 1/3C_-25 ℃ _ D/ C nom.
Work as η 1/3C_0 ℃ _ Dduring >98%, judge that the discharge capability of energy type power lithium-ion battery to be measured is good;
As 85%< η 1/3C_0 ℃ _ Dduring <98%, judge that the discharge capability of energy type power lithium-ion battery to be measured is medium;
Work as η 1/3C_0 ℃ _ Dduring <85%, judge that the discharge capability of energy type power lithium-ion battery to be measured is poor;
Described η 1/3C_0 ℃ _ Dfor the 1/3C multiplying power discharging ability coefficient of determination at 0 ℃ of temperature;
Work as η 1/3C_-10 ℃ _ Dduring >95%, judge that the discharge capability of energy type power lithium-ion battery to be measured is good;
As 80%< η 1/3C_-10 ℃ _ Dduring <95%, judge that the discharge capability of energy type power lithium-ion battery to be measured is medium;
Work as η 1/3C_-10 ℃ _ Dduring <80%, judge that the discharge capability of energy type power lithium-ion battery to be measured is poor;
Described η 1/3C_-10 ℃ _ Dfor the 1/3C multiplying power discharging ability coefficient of determination at temperature-10 ℃;
Work as η 1/3C_-15 ℃ _ Dduring >90%, judge that the discharge capability of energy type power lithium-ion battery to be measured is good;
As 75%< η 1/3C_-15 ℃ _ Dduring <90%, judge that the discharge capability of energy type power lithium-ion battery to be measured is medium;
Work as η 1/3C_-15 ℃ _ Dduring <75%, judge that the discharge capability of energy type power lithium-ion battery to be measured is poor;
Described η 1/3C_-15 ℃ _ Dfor the 1/3C multiplying power discharging ability coefficient of determination at temperature-15 ℃;
Work as η 1/3C_-20 ℃ _ Cduring >85%, judge that the discharge capability of energy type power lithium-ion battery to be measured is good;
As 70%< η 1/3C_-20 ℃ _ D<85%, judges that the discharge capability of energy type power lithium-ion battery to be measured is medium;
Work as η 1/3C_-20 ℃ _ Dduring <70%, judge that the discharge capability of energy type power lithium-ion battery to be measured is poor;
Described η 1/3C_-20 ℃ _ Dfor the 1/3C multiplying power discharging ability coefficient of determination at temperature-20 ℃;
Work as η 1/3C_-25 ℃ _ Dduring >80%, judge that the discharge capability of energy type power lithium-ion battery to be measured is good;
As 65%< η 1/3C_-25 ℃ _ Dduring <80%, judge that the discharge capability of energy type power lithium-ion battery to be measured is medium;
Work as η 1/3C_-25 ℃ _ Dduring <65%, judge that the discharge capability of energy type power lithium-ion battery to be measured is poor;
Described η 1/3C_-25 ℃ _ Dfor the 1/3C multiplying power discharging ability coefficient of determination at temperature-25 ℃.
When n equals 1/2C, temperature is respectively 0 ℃ ,-10 ℃ ,-15 ℃ ,-20 ℃ and-25 ℃;
In described step 4 according to the nC multiplying power charging ability coefficient of determination of the mesuring battary showing and method that temperature is judged the charging ability of energy type power lithium-ion battery to be measured as:
Work as η 1/2C_0 ℃ _ Cduring >95%, judge that the charging ability of energy type power lithium-ion battery to be measured is good;
As 80%< η 1/2C_0 ℃ _ Cduring <95%, judge that the charging ability of energy type power lithium-ion battery to be measured is medium;
Work as η 1/2C_0 ℃ _ Cduring <80%, judge that the charging ability of energy type power lithium-ion battery to be measured is poor;
Described η 1/2C_0 ℃ _ Cfor the 1/2C multiplying power charging ability coefficient of determination at 0 ℃ of temperature;
Work as η 1/2C_-10 ℃ _ Cduring >90%, judge that the charging ability of energy type power lithium-ion battery to be measured is good;
As 75%< η 1/2C_-10 ℃ _ Cduring <90%, judge that the charging ability of energy type power lithium-ion battery to be measured is medium;
Work as η 1/2C_-10 ℃ _ Cduring <75%, judge that the charging ability of energy type power lithium-ion battery to be measured is poor;
Described η 1/2C_-10 ℃ _ Cfor the 1/2C multiplying power charging ability coefficient of determination at temperature-10 ℃;
Work as η 1/2C_-15 ℃ _ Cduring >85%, judge that the charging ability of energy type power lithium-ion battery to be measured is good;
As 70%< η 1/2C_-15 ℃ _ Cduring <85%, judge that the charging ability of energy type power lithium-ion battery to be measured is medium;
Work as η 1/2C_-15 ℃ _ Cduring <70%, judge that the charging ability of energy type power lithium-ion battery to be measured is poor;
Described η 1/2C_-15 ℃ _ Cfor the 1/2C multiplying power charging ability coefficient of determination at temperature-15 ℃;
Work as η 1/2C_-20 ℃ _ Cduring >80%, judge that the charging ability of energy type power lithium-ion battery to be measured is good;
As 65%< η 1/2C_-20 ℃ _ C<80%, judges that the charging ability of energy type power lithium-ion battery to be measured is medium;
Work as η 1/2C_-20 ℃ _ Cduring <65%, judge that the charging ability of energy type power lithium-ion battery to be measured is poor;
Described η 1/2C_-20 ℃ _ Cfor the 1/2C multiplying power charging ability coefficient of determination at temperature-20 ℃;
Work as η 1/2C_-25 ℃ _ Cduring >75%, judge that the charging ability of energy type power lithium-ion battery to be measured is good;
As 60%< η 1/2C_-25 ℃ _ cduring <75%, judge that the charging ability of energy type power lithium-ion battery to be measured is medium;
Work as η 1/2C_-25 ℃ _ Cduring <60%, judge that the charging ability of energy type power lithium-ion battery to be measured is poor;
Described η 1/2C_-25 ℃ _ Cfor the 1/2C multiplying power charging ability coefficient of determination at temperature-25 ℃.
When n equals 1/2C, temperature is respectively 0 ℃ ,-10 ℃ ,-15 ℃ ,-20 ℃ and-25 ℃;
In described step 8 according to the nC multiplying power discharging ability coefficient of determination of the mesuring battary showing and method that temperature is judged the discharge capability of energy type power lithium-ion battery to be measured as:
Work as η 1/2C_0 ℃ _ Dduring >97%, judge that the discharge capability of energy type power lithium-ion battery to be measured is good;
As 84%< η 1/2C_0 ℃ _ Dduring <97%, judge that the discharge capability of energy type power lithium-ion battery to be measured is medium;
Work as η 1/2C_0 ℃ _ Dduring <84%, judge that the discharge capability of energy type power lithium-ion battery to be measured is poor;
Described η 1/2C_0 ℃ _ Dfor the 1/2C multiplying power discharging ability coefficient of determination at 0 ℃ of temperature;
Work as η 1/2C_-10 ℃ _ Dduring >94%, judge that the discharge capability of energy type power lithium-ion battery to be measured is good;
As 79%< η 1/2C_-10 ℃ _ Dduring <94%, judge that the discharge capability of energy type power lithium-ion battery to be measured is medium;
Work as η 1/2C_-10 ℃ _ Dduring <79%, judge that the discharge capability of energy type power lithium-ion battery to be measured is poor;
Described η 1/2C_-10 ℃ _ Dfor the 1/2C multiplying power discharging ability coefficient of determination at temperature-10 ℃;
Work as η 1/2C_-15 ℃ _ Dduring >89%, judge that the discharge capability of energy type power lithium-ion battery to be measured is good;
As 74%< η 1/2C_-15 ℃ _ Dduring <89%, judge that the discharge capability of energy type power lithium-ion battery to be measured is medium;
Work as η 1/2C_-15 ℃ _ Dduring <74%, judge that the discharge capability of energy type power lithium-ion battery to be measured is poor;
Described η 1/2C_-15 ℃ _ Dfor the 1/2C multiplying power discharging ability coefficient of determination at temperature-15 ℃;
Work as η 1/2C_-20 ℃ _ Cduring >84%, judge that the discharge capability of energy type power lithium-ion battery to be measured is good;
As 69%< η 1/2C_-20 ℃ _ D<84%, judges that the discharge capability of energy type power lithium-ion battery to be measured is medium;
Work as η 1/2C_-20 ℃ _ Dduring <69%, judge that the discharge capability of energy type power lithium-ion battery to be measured is poor;
Described η 1/2C_-20 ℃ _ Dfor the 1/2C multiplying power discharging ability coefficient of determination at temperature-20 ℃;
Work as η 1/2C_-25 ℃ _ Dduring >79%, judge that the discharge capability of energy type power lithium-ion battery to be measured is good;
As 64%< η 1/2C_-25 ℃ _ Dduring <79%, judge that the discharge capability of energy type power lithium-ion battery to be measured is medium;
Work as η 1/2C_-25 ℃ _ Dduring <64%, judge that the discharge capability of energy type power lithium-ion battery to be measured is poor;
Described η 1/2C_-25 ℃ _ Dfor the 1/2C multiplying power discharging ability coefficient of determination at temperature-25 ℃.
When n equals 1C, temperature is respectively 0 ℃ ,-10 ℃ ,-15 ℃ ,-20 ℃ and-25 ℃;
In described step 4 according to the nC multiplying power charging ability coefficient of determination of the mesuring battary showing and method that temperature is judged the charging ability of energy type power lithium-ion battery to be measured as:
Work as η 1C_0 ℃ _ Cduring >93%, judge that the charging ability of energy type power lithium-ion battery to be measured is good;
As 78%< η 1C_0 ℃ _ Cduring <93%, judge that the charging ability of energy type power lithium-ion battery to be measured is medium;
Work as η 1C_0 ℃ _ Cduring <78%, judge that the charging ability of energy type power lithium-ion battery to be measured is poor;
Described η 1C_0 ℃ _ Cfor the 1C multiplying power charging ability coefficient of determination at 0 ℃ of temperature;
Work as η 1C_-10 ℃ _ Cduring >88%, judge that the charging ability of energy type power lithium-ion battery to be measured is good;
As 73%< η 1C_-10 ℃ _ Cduring <88%, judge that the charging ability of energy type power lithium-ion battery to be measured is medium;
Work as η 1C_-10 ℃ _ Cduring <73%, judge that the charging ability of energy type power lithium-ion battery to be measured is poor;
Described η 1C_-10 ℃ _ Cfor the 1C multiplying power charging ability coefficient of determination at temperature-10 ℃;
Work as η 1C_-15 ℃ _ Cduring >83%, judge that the charging ability of energy type power lithium-ion battery to be measured is good;
As 68%< η 1C_-15 ℃ _ Cduring <83%, judge that the charging ability of energy type power lithium-ion battery to be measured is medium;
Work as η 1C_-15 ℃ _ Cduring <68%, judge that the charging ability of energy type power lithium-ion battery to be measured is poor;
Described η 1C_-15 ℃ _ Cfor the 1C multiplying power charging ability coefficient of determination at temperature-15 ℃;
Work as η 1C_-20 ℃ _ Cduring >78%, judge that the charging ability of energy type power lithium-ion battery to be measured is good;
As 63%< η 1C_-20 ℃ _ C<78%, judges that the charging ability of energy type power lithium-ion battery to be measured is medium;
Work as η 1C_-20 ℃ _ Cduring <63%, judge that the charging ability of energy type power lithium-ion battery to be measured is poor;
Described η 1C_-20 ℃ _ Cfor the 1C multiplying power charging ability coefficient of determination at temperature-20 ℃;
Work as η 1C_-25 ℃ _ Cduring >73%, judge that the charging ability of energy type power lithium-ion battery to be measured is good;
As 58%< η 1C_-25 ℃ _ Cduring <73%, judge that the charging ability of energy type power lithium-ion battery to be measured is medium;
Work as η 1C_-25 ℃ _ Cduring <58%, judge that the charging ability of energy type power lithium-ion battery to be measured is poor;
Described η 1C_-25 ℃ _ Cfor the 1C multiplying power charging ability coefficient of determination at temperature-25 ℃.
When n equals 1C, temperature is respectively 0 ℃ ,-10 ℃ ,-15 ℃ ,-20 ℃ and-25 ℃;
In described step 8 according to the nC multiplying power discharging ability coefficient of determination of the mesuring battary showing and method that temperature is judged the discharge capability of energy type power lithium-ion battery to be measured as:
Work as η 1C_0 ℃ _ Dduring >95%, judge that the discharge capability of energy type power lithium-ion battery to be measured is good;
As 82%< η 1C_0 ℃ _ Dduring <95%, judge that the discharge capability of energy type power lithium-ion battery to be measured is medium;
Work as η 1C_0 ℃ _ Dduring <82%, judge that the discharge capability of energy type power lithium-ion battery to be measured is poor;
Described η 1C_0 ℃ _ Dfor the 1C multiplying power discharging ability coefficient of determination at 0 ℃ of temperature;
Work as η 1C_-10 ℃ _ Dduring >92%, judge that the discharge capability of energy type power lithium-ion battery to be measured is good;
As 77%< η 1C_-10 ℃ _ Dduring <92%, judge that the discharge capability of energy type power lithium-ion battery to be measured is medium;
Work as η 1C_-10 ℃ _ Dduring <77%, judge that the discharge capability of energy type power lithium-ion battery to be measured is poor;
Described η 1C_-10 ℃ _ Dfor the 1C multiplying power discharging ability coefficient of determination at temperature-10 ℃;
Work as η 1C_-15 ℃ _ Dduring >87%, judge that the discharge capability of energy type power lithium-ion battery to be measured is good;
As 72%< η 1C_-15 ℃ _ Dduring <87%, judge that the discharge capability of energy type power lithium-ion battery to be measured is medium;
Work as η 1C_-15 ℃ _ Dduring <72%, judge that the discharge capability of energy type power lithium-ion battery to be measured is poor;
Described η 1C_-15 ℃ _ Dfor the 1C multiplying power discharging ability coefficient of determination at temperature-15 ℃;
Work as η 1C_-20 ℃ _ Cduring >82%, judge that the discharge capability of energy type power lithium-ion battery to be measured is good;
As 67%< η 1C_-20 ℃ _ D<82%, judges that the discharge capability of energy type power lithium-ion battery to be measured is medium;
Work as η 1C_-20 ℃ _ Dduring <67%, judge that the discharge capability of energy type power lithium-ion battery to be measured is poor;
Described η 1C_-20 ℃ _ Dfor the 1C multiplying power discharging ability coefficient of determination at temperature-20 ℃;
Work as η 1C_-25 ℃ _ Dduring >77%, judge that the discharge capability of energy type power lithium-ion battery to be measured is good;
As 63%< η 1C_-25 ℃ _ Dduring <77%, judge that the discharge capability of energy type power lithium-ion battery to be measured is medium;
Work as η 1C_-25 ℃ _ Dduring <63%, judge that the discharge capability of energy type power lithium-ion battery to be measured is poor;
Described η 1C_-25 ℃ _ Dfor the 1C multiplying power discharging ability coefficient of determination at temperature-25 ℃.
The present invention is used for evaluating and testing extremely frigid zones energy type power lithium-ion battery charging ability and discharge capability, thereby evaluates the requirement whether energy type power lithium-ion battery meets pure electric automobile under low temperature environment or energy-accumulating power station.

Claims (2)

1. extremely frigid zones energy type power lithium-ion battery low temperature charge-discharge performance detection system, is characterized in that, it comprises cryostat (1), battery charging and discharging proving installation (2) and battery performance test device (3);
Energy type power lithium-ion battery to be measured is arranged in cryostat (1),
The discharge signal output terminal of battery charging and discharging proving installation (2) is connected with the discharge signal input end of energy type power lithium-ion battery to be measured, and the charging signals output terminal of energy type power lithium-ion battery to be measured is connected with the charging signals input end of battery charging and discharging proving installation (2);
The battery voltage signal output terminal of battery charging and discharging proving installation (2) is connected with the battery voltage signal output terminal of battery performance test device (3); The battery current signal output part of battery charging and discharging proving installation (2) is connected with the battery current signal input part of battery performance test device (3); The battery temperature signal output part of battery charging and discharging proving installation (2) is connected with the battery temperature signal input part of battery performance test device (3); The battery duration of charging signal output part of battery charging and discharging proving installation (2) is connected with the battery duration of charging signal input part of battery performance test device (3); The battery discharge time signal output part of battery charging and discharging proving installation (2) is connected with the battery discharge time signal input part of battery performance test device (3);
The nC multiplying power charging current control signal output terminal of battery performance test device (3) is connected with the nC multiplying power charging current control signal input end of battery charging and discharging proving installation (2);
The nC multiplying power discharging current controling signal output terminal of battery performance test device (3) is connected with the nC multiplying power discharging current controling signal input end of battery charging and discharging proving installation (2);
Battery performance test device (3) is embedded in the test module that software is realized, and described test module comprises charging performance test cell and discharge performance test cell;
Described charging performance test cell comprises as lower module:
For sending the module of nC multiplying power charging current control signal; N is less than or equal to 2 positive number;
For receiving the module of the duration of charging signal of the voltage signal of mesuring battary, the temperature signal of the current signal of mesuring battary, mesuring battary and mesuring battary;
For the voltage signal when reception while reaching the upper voltage limit of tested battery, calculate the module of constant current value of the current signal of duration of charging and reception simultaneously;
Be used for according to the module of the charging capacity of the duration of charging calculating and constant current value calculating mesuring battary simultaneously;
For the charging capacity of the mesuring battary calculating is obtained to the module of the nC multiplying power charging ability coefficient of determination of mesuring battary divided by the rated capacity of mesuring battary;
For showing the module of temperature signal with the nC multiplying power charging ability coefficient of determination of the mesuring battary calculating of reception;
Described discharge performance test cell comprises as lower module:
For sending the module of nC multiplying power discharging current controling signal; N is less than or equal to 2 positive number;
For receiving the voltage signal of mesuring battary, the module of the temperature signal of the current signal of mesuring battary, mesuring battary and the discharge time signal of mesuring battary;
For the voltage signal when reception while reaching the lower voltage limit of tested battery, calculate the module of constant current value of the current signal of discharge time and reception simultaneously;
Be used for according to the module of the discharge capacity of the discharge time calculating and constant current value calculating mesuring battary simultaneously;
For the discharge capacity of the mesuring battary calculating is obtained to the module of the nC multiplying power discharging ability coefficient of determination of mesuring battary divided by the rated capacity of mesuring battary;
For showing the module of temperature signal with the nC multiplying power discharging ability coefficient of determination of the mesuring battary calculating of reception.
2. the detection method based on extremely frigid zones energy type power lithium-ion battery low temperature charge-discharge performance detection system claimed in claim 1, it is characterized in that, it comprises charging performance detection method and discharge performance detection method, and described charging performance detection method comprises the steps:
Step 1: under 25 degree room temperature conditions, energy type power lithium-ion battery to be measured is carried out to 1/3C multiplying power discharging to lower voltage limit;
Step 2: under 25 degree room temperature conditions, by standing 1 hour of energy type power lithium-ion battery to be measured after electric discharge;
Step 3: cryostat (1) is adjusted under the cryogenic temperature that needs to measure, and the energy type power lithium-ion battery to be measured after static 1 hour is placed on to described cryostat (1) after interior 10 hours, proceed to step 4;
Step 4: the battery charging and discharging proving installation (2) and the battery performance test device (3) that start described extremely frigid zones energy type power lithium-ion battery low temperature charge-discharge performance detection system, carry out nC multiplying power charging measurement, battery performance test device (3) shows nC multiplying power charging ability coefficient of determination and the temperature of mesuring battary, obtains the nC multiplying power charging ability coefficient of determination at described temperature of energy type power lithium-ion battery to be measured that is:;
Described charging performance detection method comprises the steps:
Step 5: under 25 degree room temperature conditions, energy type power lithium-ion battery to be measured is carried out to 1/3C multiplying power and charge to upper voltage limit; Step 6: under 25 degree room temperature conditions, by standing 1 hour of energy type power lithium-ion battery to be measured after charging;
Step 7: cryostat (1) is adjusted under the cryogenic temperature that needs to measure, and the energy type power lithium-ion battery to be measured after static 1 hour is placed on to described cryostat (1) after interior 10 hours, proceed to step 8;
Step 8: the battery charging and discharging proving installation (2) and the battery performance test device (3) that start described extremely frigid zones energy type power lithium-ion battery low temperature charge-discharge performance detection system, carry out the test of nC multiplying power discharging, nC multiplying power discharging ability coefficient of determination and the temperature of the mesuring battary that battery performance test device (3) shows, that is: the nC multiplying power discharging ability coefficient of determination of acquisition energy type power lithium-ion battery to be measured at described temperature; Described n is less than or equal to 2 positive number.
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CN112834940B (en) * 2020-12-31 2023-12-19 中国汽车工程研究院股份有限公司 High-low temperature charging test system for new energy automobile and evaluation optimization method
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