CN109212426A - A kind of detection method of Li-ion batteries piles - Google Patents
A kind of detection method of Li-ion batteries piles Download PDFInfo
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- CN109212426A CN109212426A CN201710514229.0A CN201710514229A CN109212426A CN 109212426 A CN109212426 A CN 109212426A CN 201710514229 A CN201710514229 A CN 201710514229A CN 109212426 A CN109212426 A CN 109212426A
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Abstract
The present invention provides a kind of detection methods of Li-ion batteries piles, by checking that the temperature of single battery is detected to determine whether isolating the single battery from battery pack, for the detection battery isolated, the standard value prestored in cooling rate and database by detecting the battery compares, to determine whether replacing the battery.Detection method of the invention, a possibility that being capable of detecting when the self discharge degree of battery and thermal runaway situation occur, it can accurately be found before thermal runaway occurs for battery, and the battery in unsafe condition is isolated and replaces out battery pack, improve the safety in operation of battery pack.
Description
Technical field
The present invention relates to battery technology fields, more particularly to a kind of detection method of Li-ion batteries piles.
Background technique
Lithium ion battery is high with energy density, power density is high, have extended cycle life, the advantages that safety is good becomes electronic vapour
Vehicle first choice electrical source of power.With the development of electric vehicle, power battery pack technology is also widely applied therewith, and for the safety of battery
Property aspect more stringent requirements are proposed, and the safety of battery is primarily referred to as preventing battery there is a phenomenon where thermal runaway, and existing
The judgment technology of the technology of thermal runaway in to(for) battery still fails maturation.The cooling speed that inventor's discovery passes through measurement battery
Degree, comparing with the standard cooling rate for prestoring battery in the database can judge to obtain the inside micro-short circuit of mesuring battary from putting
The degree of electricity on this basis, proposes the present invention so that the danger of thermal runaway will occur for accurate evaluation battery.
Summary of the invention
The present invention provides a kind of detection methods of Li-ion batteries piles, judge to be by checking the temperature of single battery
The no single battery that isolates from battery pack is detected, for the detection battery isolated, by detecting the battery
The standard value prestored in cooling rate and database compares, to determine whether replacing the battery.Detection method of the invention, can
A possibility that detecting the self discharge degree of battery and thermal runaway situation occurs, can accurately send out before thermal runaway occurs for battery
It is existing, and the battery in unsafe condition is isolated and replaces out battery pack, improve the safety in operation of battery pack.And
By the way that the excessively high battery of temperature cools down in time, the service life of the battery is extended, the stability of battery pack operation is improved.
Specific scheme is as follows:
A kind of detection method of Li-ion batteries piles, including following steps:
1), detect battery pack in each battery temperature, when find some single battery temperature C1 be higher than battery pack in
Battery mean temperature C2 first predetermined value when, the single battery is isolated into battery pack by opening bypass, and described in disconnecting
The electrical connection of single battery；
2) temperature and the timing for, measuring the single battery, calculate cooling rate A1 of the battery within the unit time,
By it compared with the standard cooling rate A2 prestored in database, when the A1 is lower than the A2 second predetermined value, sending is replaced
Change battery signal, and by the battery removal battery pack；Otherwise, it is put down when the temperature of the single battery is equal to the battery in battery pack
When equal temperature, bypass is closed, the electrical connection of the single battery is connected, is accessed battery pack.
Further, the first predetermined value is the 3-15% of battery mean temperature.
Further, the first predetermined value is battery mean temperature 5-12%.
Further, the first predetermined value is the 6% of battery mean temperature.
Further, the second predetermined value is the 5-20% of standard cooling rate.
Further, the second predetermined value is the 8-15% of standard cooling rate.
Further, the second predetermined value is the 10% of standard cooling rate.
A kind of combo and operation method of battery pack comprising single battery is subjected to chemical conversion combo, forms battery pack, and
It is run, wherein operational process includes above-mentioned detection method.
The chemical conversion method for group matching, including following steps:
1), one group of lithium ion battery to be changed is provided, pulse charge is carried out with the current versus cell of 0.02C-0.05C,
Charging is charged to stop by voltage；Wherein the burst length is 0.1-10min, interval time 30-120s, is charged by voltage
For 4.2-4.35V；
2), battery is extremely discharged with the current discharge of 0.05-0.2C by voltage, the electric discharge is 2.7- by voltage
2.8V；
3), step 1-2 is repeated 0-3 times；
4) aging 1-5 days, are stood；
5), the electrolyte for not immersing electrode in battery case is extracted out, refills new electrolyte, is sealed；
6) it, is charged with the current versus cell of 1-5C, charges to charging by voltage, the charging is 4.2- by voltage
4.35V, then discharged with the current versus cell of 1-5C, electric discharge is discharged to by voltage, and the electric discharge is 2.7-2.8V by voltage；
7), step 6 is repeated 0-5 times, records the capacity of battery and the temperature of battery, battery capacity is differed 3%
Within and battery of the battery temperature difference within 5 DEG C to match be one group.
The invention has the following beneficial effects:
1, it by measuring the cooling rate of battery, compares and can sentence with the standard cooling rate for prestoring battery in the database
The degree of the disconnected inside micro-short circuit self discharge for obtaining mesuring battary, so that the danger of thermal runaway will occur for accurate evaluation battery.
2, by the way that the excessively high battery of temperature cools down in time, the service life of the battery is extended, battery pack fortune is improved
Capable stability.
3, in chemical synthesizing method, during chemical conversion early period, the metal ion in active material inevitably has portion
Divide and dissolve in electrolyte, the process for being formed simultaneously SEI film can also affect the composition of electrolyte, and above-mentioned influence will affect
Therefore the performance of battery after chemical conversion, the electrolyte of composition transfer is extracted out, new electrolyte, Neng Gouti are refilled
The storage life of high battery.The concentration polarization that electrode surface is eliminated by low current pulse charge, to form stable homogeneous
SEI film is followed the active material of abundant active electrode by big current charging and discharging, and measures the high rate performance of battery.Pass through
Increase electric current to amplify the calorific value between different batteries, thus according to the capacity of battery and calorific value, it is more accurate
Capacity is close, and the identical battery that radiates is configured to battery pack, improves the homogeneity of battery pack.
It is long that the present invention by the above method constructs the service life, and performance is stablized, and the battery pack that single battery consistency of performance is good.
Specific embodiment
The present invention will be described in more detail below by specific embodiment, but protection scope of the present invention not by
It is limited to these embodiments.
Embodiment 1
1), one group of lithium ion battery to be changed is provided, pulse charge is carried out with the current versus cell of 0.05C, is charged to
Charging stops by voltage；Wherein the burst length is 10min, interval time 120s, and charging is 4.35V by voltage；
2), battery is extremely discharged with the current discharge of 0.2C by voltage, the electric discharge is 2.8V by voltage；
3), step 1-2 is repeated 3 times；
4) aging 5 days, are stood；
5), the electrolyte for not immersing electrode in battery case is extracted out, refills new electrolyte, is sealed, it is described new
Electrolyte include 1.2mol/L lithium hexafluoro phosphate and volume ratio be 1:2:1 dimethyl carbonate, ethyl carbonate, carbonic acid
The nonaqueous solvents of methyl ethyl ester composition and the fluoro vinylene carbonate of 5 volume %；
6) it, is charged with the current versus cell of 5C, charges to charging by voltage, the charging is 4.35V by voltage, then
It is discharged with the current versus cell of 5C, is discharged to electric discharge by voltage, the electric discharge is 2.8V by voltage；
7), step 6 is repeated 5 times, records the capacity of battery and the temperature of battery, by battery capacity difference 3% with
It is one group that battery of the interior and battery temperature difference within 5 DEG C, which is matched,；
8), by the battery composition battery pack in same group, the battery pack includes 50 single batteries；
9) temperature for, detecting each battery in battery pack, when the temperature for finding some single battery is higher than the battery in battery pack
When mean temperature 3%, the single battery is isolated into battery pack by opening bypass, and disconnect the electrical connection of the single battery；
10) temperature and the timing for, measuring the single battery, calculate cooling rate of the battery within the unit time,
By it compared with the standard cooling rate prestored in database, when the cooling rate of the single battery cools down lower than the standard
When speed 5%, replacement battery signal is issued, and by the battery removal battery pack；Otherwise, when the temperature of the single battery is equal to
When battery mean temperature in battery pack, bypass is closed, the electrical connection of the single battery is connected, is accessed battery pack.
Embodiment 2
1), one group of lithium ion battery to be changed is provided, pulse charge is carried out with the current versus cell of 0.02C, is charged to
Charging stops by voltage；Wherein the burst length is 0.1min, interval time 30s, and charging is 4.2V by voltage；
2), battery is extremely discharged with the current discharge of 0.05C by voltage, the electric discharge is 2.7V by voltage；
3), step 1-2 is repeated 0 time；
4), aging 1 day is stood；
5), the electrolyte for not immersing electrode in battery case is extracted out, refills new electrolyte, is sealed, it is described new
Electrolyte include 1.2mol/L lithium hexafluoro phosphate and volume ratio be 1:2:1 dimethyl carbonate, ethyl carbonate, carbonic acid
The nonaqueous solvents of methyl ethyl ester composition and the fluoro vinylene carbonate of 5 volume %；
6) it, is charged with the current versus cell of 1C, charges to charging by voltage, the charging is 4.2V by voltage, then
It is discharged with the current versus cell of 1C, is discharged to electric discharge by voltage, the electric discharge is 2.7V by voltage；
7), step 6 is repeated 1 times, records the capacity of battery and the temperature of battery, by battery capacity difference 1% with
It is one group that battery of the interior and battery temperature difference within 2 DEG C, which is matched,；
8), by the battery composition battery pack in same group, the battery pack includes 50 single batteries；
9) temperature for, detecting each battery in battery pack, when the temperature for finding some single battery is higher than in battery pack
When battery mean temperature 5%, the single battery is isolated into battery pack by opening bypass, and disconnect the electricity of the single battery
Connection；
10) temperature and the timing for, measuring the single battery, calculate cooling rate of the battery within the unit time,
By it compared with the standard cooling rate prestored in database, when the cooling rate of the single battery cools down lower than the standard
When speed 8%, replacement battery signal is issued, and by the battery removal battery pack；Otherwise, when the temperature of the single battery is equal to
When battery mean temperature in battery pack, bypass is closed, the electrical connection of the single battery is connected, is accessed battery pack.
Embodiment 3
1), one group of lithium ion battery to be changed is provided, pulse charge is carried out with the current versus cell of 0.03C, is charged to
Charging stops by voltage；Wherein the burst length is 2min, interval time 40s, and charging is 4.3V by voltage；
2), battery is extremely discharged with the current discharge of 0.1C by voltage, the electric discharge is 2.75V by voltage；
3), step 1-2 is repeated 2 times；
4) aging 3 days, are stood；
5), the electrolyte for not immersing electrode in battery case is extracted out, refills new electrolyte, is sealed, it is described new
Electrolyte include 1.2mol/L lithium hexafluoro phosphate and volume ratio be 1:2:1 dimethyl carbonate, ethyl carbonate, carbonic acid
The nonaqueous solvents of methyl ethyl ester composition and the fluoro vinylene carbonate of 5 volume %；
6) it, is charged with the current versus cell of 3C, charges to charging by voltage, the charging is 4.25V by voltage, then
It is discharged with the current versus cell of 3C, is discharged to electric discharge by voltage, the electric discharge is 2.75V by voltage；
7), step 6 is repeated 3 times, records the capacity of battery and the temperature of battery, by battery capacity difference 2% with
It is one group that battery of the interior and battery temperature difference within 3 DEG C, which is matched,；
8), by the battery composition battery pack in same group, the battery pack includes 50 single batteries；
9) temperature for, detecting each battery in battery pack, when the temperature for finding some single battery is higher than in battery pack
When battery mean temperature 6%, the single battery is isolated into battery pack by opening bypass, and disconnect the electricity of the single battery
Connection；
10) temperature and the timing for, measuring the single battery, calculate cooling rate of the battery within the unit time,
By it compared with the standard cooling rate prestored in database, when the cooling rate of the single battery cools down lower than the standard
When speed 10%, replacement battery signal is issued, and by the battery removal battery pack；Otherwise, when the temperature etc. of the single battery
When battery mean temperature in battery pack, bypass is closed, the electrical connection of the single battery is connected, is accessed battery pack.
Embodiment 4
1), one group of lithium ion battery to be changed is provided, pulse charge is carried out with the current versus cell of 0.04C, is charged to
Charging stops by voltage；Wherein the burst length is 8min, interval time 80s, and charging is 4.25V by voltage；
2), battery is extremely discharged with the current discharge of 0.15C by voltage, the electric discharge is 2.75V by voltage；
3), step 1-2 is repeated 2 times；
4) aging 2 days, are stood；
5), the electrolyte for not immersing electrode in battery case is extracted out, refills new electrolyte, is sealed, it is described new
Electrolyte include 1.2mol/L lithium hexafluoro phosphate and volume ratio be 1:2:1 dimethyl carbonate, ethyl carbonate, carbonic acid
The nonaqueous solvents of methyl ethyl ester composition and the fluoro vinylene carbonate of 5 volume %；
6) it, is charged with the current versus cell of 4C, charges to charging by voltage, the charging is 4.25V by voltage, then
It is discharged with the current versus cell of 4C, is discharged to electric discharge by voltage, the electric discharge is 2.75V by voltage；
7), step 6 is repeated 4 times, records the capacity of battery and the temperature of battery, by battery capacity difference 1% with
It is one group that battery of the interior and battery temperature difference within 3 DEG C, which is matched,；
8), by the battery composition battery pack in same group, the battery pack includes 50 single batteries；
9) temperature for, detecting each battery in battery pack, when the temperature for finding some single battery is higher than in battery pack
When battery mean temperature 12%, the single battery is isolated into battery pack by opening bypass, and disconnect the single battery
Electrical connection；
10) temperature and the timing for, measuring the single battery, calculate cooling rate of the battery within the unit time,
By it compared with the standard cooling rate prestored in database, when the cooling rate of the single battery cools down lower than the standard
When speed 15%, replacement battery signal is issued, and by the battery removal battery pack；Otherwise, when the temperature etc. of the single battery
When battery mean temperature in battery pack, bypass is closed, the electrical connection of the single battery is connected, is accessed battery pack.
Embodiment 5
1), one group of lithium ion battery to be changed is provided, pulse charge is carried out with the current versus cell of 0.03C, is charged to
Charging stops by voltage；Wherein the burst length is 5min, interval time 60s, and charging is 4.3V by voltage；
2), battery is extremely discharged with the current discharge of 0.1C by voltage, the electric discharge is 2.8V by voltage；
3), step 1-2 is repeated 1 times；
4) aging 2 days, are stood；
5), the electrolyte for not immersing electrode in battery case is extracted out, refills new electrolyte, is sealed, it is described new
Electrolyte include 1.2mol/L lithium hexafluoro phosphate and volume ratio be 1:2:1 dimethyl carbonate, ethyl carbonate, carbonic acid
The nonaqueous solvents of methyl ethyl ester composition and the fluoro vinylene carbonate of 5 volume %；
6) it, is charged with the current versus cell of 2C, charges to charging by voltage, the charging is 4.3V by voltage, then
It is discharged with the current versus cell of 2C, is discharged to electric discharge by voltage, the electric discharge is 2.8V by voltage；
7), step 6 is repeated 4 times, records the capacity of battery and the temperature of battery, by battery capacity difference 1% with
It is one group that battery of the interior and battery temperature difference within 2 DEG C, which is matched,；
8), by the battery composition battery pack in same group, the battery pack includes 50 single batteries；
9) temperature for, detecting each battery in battery pack, when the temperature for finding some single battery is higher than in battery pack
When battery mean temperature 15%, the single battery is isolated into battery pack by opening bypass, and disconnect the single battery
Electrical connection；
10) temperature and the timing for, measuring the single battery, calculate cooling rate of the battery within the unit time,
By it compared with the standard cooling rate prestored in database, when the cooling rate of the single battery cools down lower than the standard
When speed 20%, replacement battery signal is issued, and by the battery removal battery pack；Otherwise, when the temperature etc. of the single battery
When battery mean temperature in battery pack, bypass is closed, the electrical connection of the single battery is connected, is accessed battery pack.
Comparative example 1
1) one group of lithium ion battery, is chosen, three times, charge cutoff voltage 4.2V's charge and discharge cycles discharges by voltage
For 2.7V, capacity of lithium ion battery is measured；
2), the lithium ion battery by capacity difference within 1% is made into one group；
3), by the battery composition battery pack in same group, the battery pack includes 50 single batteries；
Test and result
Battery performance test, by the battery pack of embodiment 1-5 and comparative example 1, carries out the current cycle of 2C, is recycling
The single battery maximum capacity difference in battery pack is measured at 200,300,400 times, to measure the deterioration condition of battery pack.By table
1 as it can be seen that relaxing with testing conditions, the number for replacing battery are reduced in embodiment 1-5, but deterioration of battery situation becomes heavy；
And the battery cell deterioration condition of comparative example is more obvious, and loses in the 327th circulation since heat occurs for battery cell
Control is scrapped.
Table 1
It is discussed in detail although the contents of the present invention have passed through above preferred embodiment, but it would be recognized that above-mentioned
Description be not considered as limitation of the present invention.
Claims (8)
1. a kind of detection method of Li-ion batteries piles, including following steps:
1), detect battery pack in each battery temperature, when find some single battery temperature C1 be higher than battery pack in electricity
When the mean temperature C2 first predetermined value of pond, the single battery is isolated into battery pack by opening bypass, and disconnect the monomer
The electrical connection of battery；
2) temperature and the timing for, measuring the single battery, calculate cooling rate A1 of the battery within the unit time, by it
Compared with the standard cooling rate A2 prestored in database, when the A1 is lower than the A2 second predetermined value, replacement electricity is issued
Pond signal, and by the battery removal battery pack；Otherwise, when the temperature of the single battery is equal to the average temperature of the battery in battery pack
When spending, bypass is closed, the electrical connection of the single battery is connected, is accessed battery pack.
2. detection method as described in claim 1, the first predetermined value is the 3-15% of battery mean temperature.
3. detection method as described in claim 1, the first predetermined value is battery mean temperature 5-12%.
4. detection method as described in claim 1, the first predetermined value is the 6% of battery mean temperature.
5. detection method as described in claim 1, the second predetermined value is the 5-20% of standard cooling rate.
6. detection method as described in claim 1, the second predetermined value is the 8-15% of standard cooling rate.
7. detection method as described in claim 1, the second predetermined value is the 10% of standard cooling rate.
8. the combo and operation method of a kind of battery pack comprising single battery is carried out chemical conversion combo, battery pack is formed, goes forward side by side
Row operation, wherein operational process includes the described in any item detection methods of the 1-7.
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Application publication date: 20190115 |