CN204269787U - The conforming detection system of a kind of lithium ion battery cryogenic property - Google Patents
The conforming detection system of a kind of lithium ion battery cryogenic property Download PDFInfo
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- CN204269787U CN204269787U CN201420548772.4U CN201420548772U CN204269787U CN 204269787 U CN204269787 U CN 204269787U CN 201420548772 U CN201420548772 U CN 201420548772U CN 204269787 U CN204269787 U CN 204269787U
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Abstract
The conforming detection system of a kind of lithium ion battery cryogenic property, it comprises temperature and humidity regulator, data acquisition unit and discharge and recharge automatic control equipment; It is characterized in that, this discharge and recharge automatic control equipment is used for starting the discharge and recharge of battery and intermission, battery standing time, the size of charging and discharging currents, cycle charge discharge number of times and discharge and recharge stop condition and set; This temperature and humidity regulator for providing room temperature condition with cryogenic conditions, obtain the consistance of Li-ion batteries piles under normal temperature and low temperature environment with this.Detection system is adopted to detect lithium ion battery electrical property consistency under cryogenic fast, easily, effectively solve each cell under normal temperature condition electrical property consistency well and at low temperatures electrical property may differ larger shortcoming, the detection of battery in enormous quantities and the screening of battery combo can be applied to, can improve the quality of Li-ion batteries piles, the person of economizing in consumption changes the cost of battery simultaneously.
Description
Technical field
This area relates to electrokinetic cell detection field, particularly the conforming detection system of a kind of lithium ion battery cryogenic property.
Background technology
The research and development of electric road vehicle (comprising electric automobile, battery-operated motor cycle etc.), is considered to one of the most real, the most effective approach of the crisis of current solution world energy sources and global environmental pollution.And be one of key components and parts of its development of restriction as the battery of electric road vehicle.
Because lithium ion battery has the features such as specific energy is high, specific power large, long service life, working range are wide, be successfully applied on electric road vehicle.Electric road vehicle lithium ion battery needs little for multiple capacity, that voltage is low cell to be combined into by parallel/serial mode the electric battery that capacity is high, voltage is high usually.But due to the consistance difference of each cell, electric battery performance after certain charge and discharge cycles has decline in various degree, show as cell consistance difference in the increasing of capacity attenuation rate and electric battery and become large.Particularly at low temperatures, due to lithium ion battery employing is organic electrolyte system, active substance conductivity is also lower, its cryogenic property is often poor than the secondary cell such as lead-acid battery and Ni-MH battery, especially multi-series and parallel combination after electric battery at low temperatures performance sharply lower, even if cell embodies good consistance at normal temperatures, also there will be battery electrical property inconsistency aggravation at low temperatures, battery performance is reduced greatly.
At present, improve mainly through following measures or detect the consistance of Li-ion batteries piles: (1) cell manufacturer improves technological level, before battery dispatches from the factory, for standard, battery is screened with voltage, internal resistance etc., ensure that a collection of battery performance is consistent as far as possible with this; (2) in use Timing measurement single battery voltage distribution situation, the battery being in two ends to voltage in electric battery carries out adjustment in time and changes, to ensure that the inconsistency of electric battery does not increase with service time; (3) to the battery of low voltage in voltage measurement, charge separately, make its performance recovery; (4) at regular intervals small area analysis trickle charge is carried out to electric battery between, promote the equilibrium of electric battery self; (5) avoid battery overcharge, prevent battery deep discharge as far as possible; (6) install battery pack power equalizing system additional, intelligent management etc. is carried out to battery set charge/discharge.
But said detecting system is all the test and repair for the battery consistency at conventional applied environment, and consistance when well cannot ensure that electric battery uses at low ambient temperatures.
Therefore, in order to better detect and guarantee electric road vehicle Li-ion batteries piles consistance at low ambient temperatures, a kind of detection system of lithium ion battery low temp. electric consistency of performance must be developed, to realize fast, easily detecting lithium ion battery electrical property consistency under cryogenic, effectively solve each cell and embody good electrical property consistency under normal temperature condition, and the problem that electrical property difference is larger under cryogenic.
Summary of the invention
The purpose of this utility model is to provide a kind of detection system of electrical property consistency of lithium ion battery, can detect lithium ion battery electrical property consistency under cryogenic, effectively solve each cell and embody good electrical property consistency under normal temperature condition, and the problem that differs greatly of electrical property under cryogenic, can detect monomer lithium ion battery in enormous quantities, filter out qualified monomer lithium ion battery and be made into electric battery, ensure that electric battery has good consistance at low ambient temperatures, improve the quality of Li-ion batteries piles, save the cost that consumer changes battery, there is certain economic implications and social effect.
For this reason, the technical solution of the utility model is:
A detection system for electrical property consistency of lithium ion battery, it comprises temperature and humidity regulator and data acquisition unit; Wherein, temperature and humidity regulator, the humidity and temperature for the measurement environment to battery carries out regulable control; Further, the adjustment of temperature is comprised normal temperature and low temperature environment are provided; And described low temperature environment is-30 ± 2 degrees Celsius;
Data acquisition unit, for gathering voltage and the capacitance data of battery;
It is characterized in that, this detection system also comprises discharge and recharge automatic control equipment, and this discharge and recharge automatic control equipment is used for starting the discharge and recharge of battery and intermission, battery standing time, the size of charging and discharging currents, cycle charge discharge number of times and discharge and recharge stop condition and set; Record is carried out to the data that described data acquisition unit collects simultaneously.
Wherein, described discharge and recharge termination condition comprises termination voltage.
Wherein, the described cycle charge-discharge time is 10 times.
Wherein, described discharge and recharge automatic control equipment comprises multiple subset, and each equipment can be used for controlling one piece of monomer lithium ion battery.
Wherein, described discharge and recharge automatic control equipment comprises 10 control ports.
Wherein, described discharge and recharge stops the magnitude of voltage that condition is setting.
The utility model has the advantage of, it carries out outside conventional voltage, internal resistance, capacity, the conforming selective mechanisms of storage voltage degradation at normal temperatures, cycle life under increase low temperature after discharge and recharge detects, in order to evaluate battery electrochemical properties at low temperatures, thus ensure the consistance of each cell electrical property at low temperatures, realize the rational combo of battery, ensure that electric battery all has excellent performance when low temperature and normal temperature discharge and recharge.
Accompanying drawing explanation
It is structured flowchart of the present utility model in Fig. 1;
Fig. 2 is the charging capacity curve map of embodiment 1;
Fig. 3 is discharge capacity curve map;
Embodiment
The detection system 1 of electrical property consistency of lithium ion battery comprises: temperature and humidity regulator 2 and data acquisition unit 3 (concrete model FLUKE 2620) and discharge and recharge automatic control equipment 4; Wherein, temperature and humidity regulator 2, the humidity and temperature for the measurement environment to battery carries out regulable control; Further, comprise provide normal temperature and low temperature environment to the adjustment of temperature, this low temperature environment can be-30 ± 2 degrees Celsius; Data acquisition unit, for gathering voltage and the capacitance data of battery, to calculate the voltage of battery, internal resistance, capacity and storage voltage degradation; Wherein, this detection system also comprises discharge and recharge automatic control equipment, and this discharge and recharge automatic control equipment is used for starting the discharge and recharge of battery and intermission, battery standing time, the size of charging and discharging currents, cycle charge discharge number of times and discharge and recharge stop condition and set; Record is carried out to the data that described data acquisition unit collects simultaneously.
Wherein, described discharge and recharge termination condition comprises termination voltage; Wherein, the described cycle charge-discharge time is 10 times; Described discharge and recharge automatic control equipment comprises multiple subset, and each equipment can be used for controlling one piece of monomer lithium ion battery; Described discharge and recharge automatic control equipment comprises 10 control ports, for carrying out charge and discharge control to 10 pieces of cells; Wherein, described discharge and recharge stops the magnitude of voltage that condition is setting.
In order to describe structure of the present utility model better, below illustrating and using the utility model to carry out the process of testing.
Detected object: domestic lithium ion power cell, rated voltage 3.7V, nominal capacity 10Ah; Physical dimension (long × wide × high) is: 133mm × 66mm × 18mm; The positive electrode active materials of battery is LiMn
2o
4, negative active core-shell material is graphite, and the principal ingredient of electrolytic solution is LiPF
6, EC (ethylene carbonate) and DMC (dimethyl carbonate), barrier film is celgard 2325.
The utility model is used to carry out cryogenic property consistency detecting method step as follows:
1, the electric discharge setting discharge and recharge automatic control equipment starts and intermission, battery standing time, the size of charging and discharging currents, cycle charge discharge number of times and discharge and recharge stop condition;
2, 10 pieces of monomer lithium ion batteries are connected one by one with 10 control ports of discharge and recharge automatic control equipment, under the room temperature controlled by temperature and humidity regulator 2 (20 DEG C ± 2 DEG C) condition, constant-current constant-voltage charging system and constant-current discharge system is adopted to carry out 10 charge and discharge cycles, by mesuring battary under test temperature condition with 3500mA current discharge, 2.7V is reached to cell voltage, leave standstill 1h, then with 3500mA constant-current charge, constant-voltage charge is turned when cell voltage reaches 4.2V, charging is stopped when being down to 350mA to charging current, after cycle charge-discharge like this 10 times, data acquisition unit is utilized to measure the magnitude of voltage V of each monomer lithium ion battery
1, and 7 days are stored under room temperature (20 DEG C ± 2 DEG C), then measure the magnitude of voltage V of each monomer lithium ion battery
2, calculate the voltage drop values △ V=V that each cell stores front and back
1-V
2, measurement and calculation result is as shown in table 1.
Table 1
| Battery is numbered | Magnitude of voltage V 1/V | Magnitude of voltage V 2/V | Voltage drop values △ V |
| 1 | 4.197 | 4.175 | 0.022 |
| 2 | 4.197 | 4.191 | 0.006 |
| 3 | 4.196 | 4.187 | 0.009 |
| 4 | 4.199 | 4.196 | 0.003 |
| 5 | 4.198 | 4.194 | 0.004 |
| 6 | 4.198 | 4.192 | 0.006 |
| 7 | 4.196 | 4.191 | 0.005 |
| 8 | 4.193 | 4.173 | 0.020 |
| 9 | 4.197 | 4.185 | 0.012 |
| 10 | 4.197 | 4.191 | 0.006 |
It is 0.020V that this experiment setting voltage reduces threshold values, the voltage drop low valve valve of the △ V>=setting of No. 1 and No. 8 monomer lithium ion battery and △ V>=0.020V as shown in Table 1, for the monomer lithium ion battery (defective monomer lithium ion battery) that self discharge is large, remaining cell is qualified monomer lithium ion battery B
1(battery is numbered: 2,3,4,5,6,7,9,10).
3, data acquisition unit is utilized to measure each monomer lithium ion battery B
1actual battery capacity C
1, and calculate corresponding capacity difference, as shown in table 2.
Table 2
| Battery is numbered | Actual battery capacity C 1/mAh | Capacity difference/mAh |
| 2 | 10683.87 | 6.84 |
| 3 | 10675.01 | 6.75 |
| 4 | 10659.94 | 6.60 |
| 5 | 10646.68 | 6.47 |
| 6 | 10352.08 | 3.52 |
| 7 | 10364.25 | 3.64 |
| 9 | 10352.88 | 3.53 |
| 10 | 10338.21 | 3.38 |
The capacity difference of each monomer lithium ion battery is all at capacity difference standard △ C as shown in Table 2
1(△ C
1=(actual battery capacity C
1-nominal capacity)/nominal capacity × 100%=± 10%) scope in, therefore, all monomer lithium ion batteries in table 2 are the battery B after capacity difference stepping
c1(battery is numbered: 2,3,4,5,6,7,9,10), and by B
c1charge to 100% state-of-charge.
4, under cryogenic (-30 DEG C ± 2 DEG C) are by cell B
c1after shelving 4 hours, carry out 10 charge and discharge cycles, and calculate the cycle life L after the 10th charge and discharge cycles
10(discharge capacity × 100% of the discharge capacity/1st time charge and discharge cycles namely during the 10th charge and discharge cycles), as shown in table 3.
Table 3
| Battery is numbered | Cycle life |
| 2 | 95.38 |
| 3 | 94.86 |
| 4 | 95.97 |
| 5 | 95.57 |
| 6 | 93.11 |
| 7 | 96.21 |
| 9 | 93.98 |
| 10 | 95.66 |
The standard of this experiment setting battery cycle life is 95%, i.e. cycle life L
10the monomer lithium ion battery of >95% is the battery selected under low temperature environment.Choose according to table 3 and obtain cycle life L
10the monomer lithium ion battery of >95%, namely battery is numbered 2, and the battery of 4,5,7,10 is the qualified monomer lithium ion battery B selected under low temperature environment
c2.
5, at monomer lithium ion battery B
c2in, choose the battery strings that battery is numbered 5 and 10 and be unified into electric battery 1.Fig. 2 and Fig. 3 is under-30 DEG C ± 2 DEG C conditions respectively, charging capacity curve map when electric battery 1 and electric battery 2 (electric battery of being undertaken that voltage difference, internal resistance are poor by commonsense method, obtaining after capacity difference screening) carry out 5 charge and discharge cycles with 0.2C multiplying power and discharge capacity curve map.As can be seen from the contrast of Fig. 2 and Fig. 3, charge/discharge capacity decay is slow at low temperatures for the electric battery adopting the utility model method to obtain, and discharge capacity is relatively high, and between electric battery, consistance is better.
Compared with prior art, the detection system of a kind of electrical property consistency of lithium ion battery that the utility model provides, it can detect lithium ion battery electrical property consistency under cryogenic fast, easily, effectively solve each cell and embody good electrical property consistency under normal temperature condition, and electrical property may differ larger shortcoming at low temperatures, the detection of battery in enormous quantities and the screening of battery combo can be applied to.Can improve the quality of Li-ion batteries piles, the person of economizing in consumption changes the cost of battery, has certain economic implications and social effect.
Although described embodiment of the present utility model in detail above, when not departing from spirit of the present utility model or inner characteristic, the utility model can also embody by other form.Therefore, above description is only used to illustrate, instead of in order to limit.Protection domain of the present utility model should be limited by the above description in claims instead of instructions.All equivalence transformations in claim implication all should fall within protection domain of the present utility model.
Claims (6)
1. the conforming detection system of lithium ion battery cryogenic property, it comprises temperature and humidity regulator and data acquisition unit; Wherein,
Temperature and humidity regulator, the humidity and temperature for the measurement environment to battery carries out regulable control; Further, the adjustment of temperature is comprised normal temperature and low temperature environment are provided; And described low temperature environment is-30 ± 2 degrees Celsius;
Data acquisition unit, for gathering voltage and the capacitance data of battery;
It is characterized in that,
This detection system also comprises discharge and recharge automatic control equipment, and this discharge and recharge automatic control equipment is used for starting the discharge and recharge of battery and intermission, battery standing time, the size of charging and discharging currents, cycle charge discharge number of times and discharge and recharge stop condition and set; Record is carried out to the data that described data acquisition unit collects simultaneously.
2. the conforming detection system of lithium ion battery cryogenic property according to claim 1, described discharge and recharge stops condition and comprises termination voltage.
3. the conforming detection system of lithium ion battery cryogenic property according to claim 1, the described cycle charge-discharge time is 10 times.
4. the conforming detection system of lithium ion battery cryogenic property according to claim 1, described discharge and recharge automatic control equipment comprises multiple subset, and each equipment can be used for controlling one piece of monomer lithium ion battery.
5. the conforming detection system of lithium ion battery cryogenic property according to claim 4, described discharge and recharge automatic control equipment comprises 10 control ports.
6. the conforming detection system of lithium ion battery cryogenic property according to claim 1, described discharge and recharge stops the magnitude of voltage that condition is setting.
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| CN105044614A (en) * | 2015-08-05 | 2015-11-11 | 国家电网公司 | Single-phase electric energy meter battery life acceleration test system and method |
| CN105044616A (en) * | 2015-08-09 | 2015-11-11 | 安徽普为智能科技有限责任公司 | Lithium battery detection method |
| CN105548895A (en) * | 2015-12-17 | 2016-05-04 | 北京长城华冠汽车科技股份有限公司 | Battery pack performance test method and device |
| CN106526491A (en) * | 2016-10-27 | 2017-03-22 | 国家电网公司 | Retired lithium ion battery module screening and recombining system and method used for energy storage power station |
| CN108387848A (en) * | 2018-03-22 | 2018-08-10 | 湖州师范学院 | A kind of method of the single battery of consistency difference in automatic replacing power battery pack |
| CN110221227A (en) * | 2019-05-31 | 2019-09-10 | 上海动力储能电池系统工程技术有限公司 | Single battery state consistency evaluating method in battery modules |
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| CN105044614A (en) * | 2015-08-05 | 2015-11-11 | 国家电网公司 | Single-phase electric energy meter battery life acceleration test system and method |
| CN105044616A (en) * | 2015-08-09 | 2015-11-11 | 安徽普为智能科技有限责任公司 | Lithium battery detection method |
| CN105548895A (en) * | 2015-12-17 | 2016-05-04 | 北京长城华冠汽车科技股份有限公司 | Battery pack performance test method and device |
| CN105548895B (en) * | 2015-12-17 | 2018-10-09 | 北京长城华冠汽车科技股份有限公司 | A kind of battery performance test method and device |
| CN106526491A (en) * | 2016-10-27 | 2017-03-22 | 国家电网公司 | Retired lithium ion battery module screening and recombining system and method used for energy storage power station |
| CN108387848A (en) * | 2018-03-22 | 2018-08-10 | 湖州师范学院 | A kind of method of the single battery of consistency difference in automatic replacing power battery pack |
| CN110221227B (en) * | 2019-05-31 | 2022-01-14 | 上海动力储能电池系统工程技术有限公司 | Method for evaluating state consistency of single batteries in battery module |
| CN110221227A (en) * | 2019-05-31 | 2019-09-10 | 上海动力储能电池系统工程技术有限公司 | Single battery state consistency evaluating method in battery modules |
| CN111337838A (en) * | 2020-03-04 | 2020-06-26 | 合肥国轩高科动力能源有限公司 | Method for testing SOC-OCV (state of charge-Voltage control Circuit) of ternary lithium ion battery in charging process at low temperature |
| CN111337838B (en) * | 2020-03-04 | 2022-08-09 | 合肥国轩高科动力能源有限公司 | Method for testing SOC-OCV (state of charge-Voltage control Circuit) of ternary lithium ion battery in charging process at low temperature |
| CN111883865A (en) * | 2020-07-31 | 2020-11-03 | 合肥国轩高科动力能源有限公司 | Low-temperature charging method for lithium ion battery |
| CN111965555A (en) * | 2020-09-18 | 2020-11-20 | 重庆长安新能源汽车科技有限公司 | Parallel connection group screening method for single batteries |
| CN111965555B (en) * | 2020-09-18 | 2022-05-03 | 重庆长安新能源汽车科技有限公司 | Parallel connection group screening method for single batteries |
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| CN114035058A (en) * | 2021-12-22 | 2022-02-11 | 湖北大学 | Low-temperature lithium battery test system and method |
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