CN107561449A - Self-discharge screening method for lithium iron phosphate battery - Google Patents
Self-discharge screening method for lithium iron phosphate battery Download PDFInfo
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- CN107561449A CN107561449A CN201710640010.5A CN201710640010A CN107561449A CN 107561449 A CN107561449 A CN 107561449A CN 201710640010 A CN201710640010 A CN 201710640010A CN 107561449 A CN107561449 A CN 107561449A
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- Prior art keywords
- battery
- partial volume
- voltage
- iron phosphate
- lithium iron
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Links
- 238000000034 method Methods 0.000 title claims abstract description 23
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 title claims abstract description 22
- 238000012216 screening Methods 0.000 title claims abstract description 21
- 230000003247 decreasing effect Effects 0.000 claims abstract description 5
- 210000003127 knee Anatomy 0.000 claims description 16
- 210000004027 cell Anatomy 0.000 claims description 9
- 230000005611 electricity Effects 0.000 claims description 7
- 210000001744 T-lymphocyte Anatomy 0.000 claims description 3
- 230000000052 comparative effect Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 238000007599 discharging Methods 0.000 abstract description 4
- 230000010287 polarization Effects 0.000 abstract description 4
- 229910052744 lithium Inorganic materials 0.000 description 5
- 239000005955 Ferric phosphate Substances 0.000 description 3
- 229940032958 ferric phosphate Drugs 0.000 description 3
- WBJZTOZJJYAKHQ-UHFFFAOYSA-K iron(3+) phosphate Chemical compound [Fe+3].[O-]P([O-])([O-])=O WBJZTOZJJYAKHQ-UHFFFAOYSA-K 0.000 description 3
- 229910000399 iron(III) phosphate Inorganic materials 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000035772 mutation Effects 0.000 description 2
- 229910052493 LiFePO4 Inorganic materials 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- Secondary Cells (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention discloses a self-discharge screening method of a lithium iron phosphate battery, which comprises the steps of firstly selecting a plurality of batteries to determine a voltage break point of the batteries in a low-voltage state by utilizing low-current discharge, discharging the batteries to a preset cut-off voltage by three-stage decreasing current for a production battery, then carrying out charging and discharging operation on the batteries in a narrow voltage range by using the low current, eliminating the polarization of the batteries to the maximum extent, taking the final real voltage of the batteries as the break voltage, and achieving the purpose of increasing voltage drop to screen automatic discharge accuracy. According to the invention, whether the lithium iron phosphate battery meets the requirements can be judged in a short time, the production cycle of the lithium iron phosphate battery can be shortened, the judgment is accurate, zero error can be basically ensured, the battery standing time is effectively shortened, and the supply rate is improved.
Description
Technical field
The present invention relates to technical field of lithium ion, more particularly to a kind of self discharge of lithium iron phosphate battery screening technique.
Background technology
The method of screening self discharge at present by the way of voltage drop, i.e., stands a period of time at a certain temperature mostly,
Self discharge big battery is screened using front and rear voltage drop, but because the reasons such as battery polarization, measured voltage can not be true
Reflect the open-circuit voltage of battery at that time, the particularly voltage before battery standing, if but waiting battery polarization disappearance or being reduced to minimum
It is an extremely very long process again, this does not allow in normal production process, comes simultaneously for ferric phosphate lithium cell
Say, especially in high voltage state, or when charging and discharging currents are larger, it is difficult again to be eliminated in the short time that it, which polarizes, reaches voltage actual value,
By the voltage drop in a period of time come to screen self discharge its accuracy rate be very low.
The content of the invention
Based on technical problem existing for background technology, the present invention proposes a kind of self discharge of lithium iron phosphate battery screening side
Method.
A kind of self discharge of lithium iron phosphate battery screening technique proposed by the present invention, comprises the following steps：
S1, some Full Charge Capacity batteries are chosen as with reference to battery, to being discharged with reference to battery with electric current I0, obtain capacity-electricity
Buckle line, and the acquisition knee voltage U1 on capacitance-voltage curves；
Partial volume battery is treated in S2, acquisition, is treated partial volume battery and is discharged to default cut-off electricity with default three sections of decreasing currents
Press U2；
S3, after partial volume battery standing time t1, using predetermined current I1 to treat that partial volume battery charged to more than knee voltage
U1；
S4, after partial volume battery standing time t2, using predetermined current I2 to treat partial volume battery discharge to being less than knee voltage
U1；
S5, after partial volume battery standing time t3, using predetermined current I3 to treat that partial volume battery charges to knee voltage U1；
S6, after partial volume battery standing time t4, using predetermined current I4 to treat partial volume battery discharge to knee voltage U1；
S7, after partial volume battery standing time t, measure cell voltage OCV1；It will be surveyed after partial volume battery standing time T
Cell voltage OCV2 is obtained, time value T is more than hundred times of time value t；
S8, calculating treat the voltage change Δ V=OCV1-OCV2 of partial volume battery, and by Δ V and default change threshold ratio
Compared with；
S9, according to Δ V and change threshold comparative result, judge that this treats whether partial volume battery is self discharge big battery.
Preferably, t1, t2, t3, t4 and t value 5min to 20min.
Preferably t1=t2=t3=t4=10min, t=10min.
Preferably, T values 5-10 days.
Preferably, I0 is 0.005C -0.01C.
Preferably, I1, I2, I3 and I4 value between 0.02C -0.05C.
Preferably, step S2 is specially：Partial volume battery is treated, 3.0V is discharged to electric current 0.67C -1C, stands 10-
After 20min, 2.8V is discharged to electric current 0.1C -0.5C, after standing 10-20min, is discharged to electric current 0.02C -0.05C
2.8V。
Preferably, step S3 is specially：After partial volume battery standing time t1, using predetermined current I1 to treat that partial volume battery fills
Electricity is to 101%U1；Step S4 is specially：After partial volume battery standing time t2, using predetermined current I2 to treat partial volume battery discharge
99%U1.
Preferably, step S9 is specially：When Δ V is more than change threshold, then judge that this treats partial volume battery for the big electricity of self discharge
Pond.
Preferably, step S1 to S9 is carried out under 25 ± 5 DEG C of temperature environment.
A kind of self discharge of lithium iron phosphate battery screening technique proposed by the present invention, if choosing dry cell first utilizes low current
Voltage jump point when electric discharge is to determine battery low pressure state, production battery is discharged to three sections of decreasing currents and preset by voltage,
Then with low current, to battery, the charge and discharge in narrow voltage range is electrically operated, at utmost to eliminate battery polarization, makes it final true
Real voltage is mutation voltage, reaches increase and screens automatic discharging accuracy purpose with voltage drop.
A kind of self discharge of lithium iron phosphate battery screening technique proposed by the present invention, more science is simple, can more accurately sieve
The big battery of self discharge is selected, while improves the uniformity of monomer battery voltage, battery pack quality is lifted, fundamentally solves
The battery cyclic life-span is caused to terminate this problem in advance because cell falls behind., can be in the short period of time by the present invention
Judge whether ferric phosphate lithium cell meets to require, the production cycle of lithium battery, and accuracy of judgement can be shortened, can be protected substantially
Zero error is demonstrate,proved, effectively shortens the battery standing time, improves supply of material speed.
Brief description of the drawings
Fig. 1 is a kind of self discharge of lithium iron phosphate battery screening technique flow chart proposed by the present invention；
Fig. 2 is inventive embodiments data record figure.
Embodiment
A kind of reference picture 1, self discharge of lithium iron phosphate battery screening technique proposed by the present invention, comprises the following steps, and with
Under all steps carried out under 25 ± 5 DEG C of temperature environment.
S1, some Full Charge Capacity batteries are chosen as with reference to battery, to being discharged with reference to battery with electric current I0, obtain capacity-electricity
Buckle line, and the acquisition knee voltage U1 on capacitance-voltage curves.In this step, knee voltage is bent on capacitance-voltage curves
The point of rate mutation.In this step, I0 is 0.005C -0.01C small level electric current.
Partial volume battery is treated in S2, acquisition, is treated partial volume battery and is discharged to default cut-off electricity with default three sections of decreasing currents
Press U2.Specifically, U2 can value 2.8V.This step is specially：Partial volume battery is treated, 3.0V is discharged to electric current 0.67C -1C,
After standing 10-20min, 2.8V is discharged to electric current 0.1C -0.5C, after standing 10-20min, put with electric current 0.02C -0.05C
Electricity is to 2.8V.
S3, after partial volume battery standing time t1, using predetermined current I1 to treat that partial volume battery charged to more than knee voltage
U1.Specifically, in this step, using predetermined current I1 to treat that partial volume battery charges to 101%U1.
S4, after partial volume battery standing time t2, using predetermined current I2 to treat partial volume battery discharge to being less than knee voltage
U1.Specifically, in this step, using predetermined current I2 to treat partial volume battery discharge 99%U1.
S5, after partial volume battery standing time t3, using predetermined current I3 to treat that partial volume battery charges to knee voltage U1.
S6, after partial volume battery standing time t4, using predetermined current I4 to treat partial volume battery discharge to knee voltage U1.
In present embodiment, t1, t2, t3 and t4 value 5min to 20min, I 1, I2, I3 and I4 are in 0.02C -0.05C
Between value.
S7, after partial volume battery standing time t, measure cell voltage OCV1；It will be surveyed after partial volume battery standing time T
Cell voltage OCV2 is obtained, time value T is more than hundred times of time value t.
T values 5min to 20min.T values 5-10 days.
S8, calculating treat the voltage change Δ V=OCV1-OCV2 of partial volume battery, and by Δ V and default change threshold ratio
Compared with.
S9, according to Δ V and change threshold comparative result, judge that this treats whether partial volume battery is self discharge big battery.Specifically
This step in, when Δ V is more than change threshold, then judge that this treats partial volume battery for self discharge big battery.
The present invention is further explained below in conjunction with a specific embodiment.
In the present embodiment, the square aluminum hull LiFePO4/Delanium battery for making model 1965140 put certainly
Electric sieve selects, and the battery nominal capacity is 16Ah.Comprise the following steps that：
S1, full electric 10, the 1965140 type battery of state of any selection, at 25 ± 5 DEG C of temperature, with 160mA current discharges, are obtained
To capacity-voltage curve, it is 3050 ± 1mV to obtain catastrophe point voltage.
In the present embodiment, 100, partial volume battery is treated in production, to respectively treating that partial volume battery divides one by one according to following steps
Hold.
S2, partial volume battery is treated, 3000mV is discharged to electric current 16000mA, after standing 10min, put with electric current 3200mA
After standing 10min, 2800mV is discharged to electric current 800mA to 2800mV for electricity.
S3, after standing 10min, it will treat that partial volume battery charges to 3080mV with electric current 800mA.
S4,10min is stood, with electric current 800mA partial volume battery discharge will be treated to 3020mV.
S5,10min is stood, will treat that partial volume battery charges to 3050mV with electric current 800mA.
S6,10min is stood, with electric current 800mA partial volume battery discharge will be treated to 3050mV.
S7, after standing 10min, cell voltage OCV1 is measured, after battery is stood into 5 days at room temperature, measures voltage OCV2.
In the present embodiment, 100 are treated shown in the test data that partial volume battery obtains data logger as shown in Figure 2.
It can be seen that in the present embodiment, t1=t2=t3=t4=10min, t=10min, T=5 days；I0=160mA, I 1=
I2=I3=I4=800mA.
S8, the voltage change Δ V=OCV1-OCV2 for asking for respectively treating partial volume battery.
In the present embodiment, it is 9V to set voltage change threshold value.
S9, judgement respectively treat whether the voltage change Δ V of partial volume battery is more than 9V, and will be greater than 9V treats partial volume battery conduct
Self discharge big battery.In the present embodiment, reference picture 2, numbering is the battery △ V data exceptions of numbering 21 and 93 in table, is determined as oneself
Electric discharge big battery, remaining is self discharge baby battery, meets technological requirement.
Pass through the present embodiment, it is seen then that the present invention can judge whether ferric phosphate lithium cell meets to want in the short period of time
Ask, the production cycle of lithium battery, and accuracy of judgement can be shortened, can be with basic guarantee zero error, when effectively shortening battery standing
Between, improve supply of material speed.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto,
Any one skilled in the art the invention discloses technical scope in, technique according to the invention scheme and its
Inventive concept is subject to equivalent substitution or change, should all be included within the scope of the present invention.
Claims (10)
1. a kind of self discharge of lithium iron phosphate battery screening technique, it is characterised in that comprise the following steps：
S1, some Full Charge Capacity batteries are chosen as with reference to battery, to being discharged with reference to battery with electric current I0, obtain capacitance-voltage song
Line, and knee voltage U1 is obtained on capacitance-voltage curves；
Partial volume battery is treated in S2, acquisition, is treated partial volume battery and is discharged to default blanking voltage U2 with default three sections of decreasing currents；
S3, after partial volume battery standing time t1, using predetermined current I1 to treat that partial volume battery charged to more than knee voltage U1；
S4, after partial volume battery standing time t2, using predetermined current I2 to treat partial volume battery discharge to being less than knee voltage U1；
S5, after partial volume battery standing time t3, using predetermined current I3 to treat that partial volume battery charges to knee voltage U1；
S6, after partial volume battery standing time t4, using predetermined current I4 to treat partial volume battery discharge to knee voltage U1；
S7, after partial volume battery standing time t, measure cell voltage OCV1；Electricity will be measured after partial volume battery standing time T
Cell voltage OCV2, time value T are more than hundred times of time value t；
S8, calculating treat the voltage change Δ V=OCV1-OCV2 of partial volume battery, and by Δ V compared with default change threshold；
S9, according to Δ V and change threshold comparative result, judge that this treats whether partial volume battery is self discharge big battery.
2. self discharge of lithium iron phosphate battery screening technique as claimed in claim 1, it is characterised in that t1, t2, t3, t4 and t take
Value 5min to 20min.
3. self discharge of lithium iron phosphate battery screening technique as claimed in claim 2, it is characterised in that
T1=t2=t3=t4=10min, t=10min.
4. self discharge of lithium iron phosphate battery screening technique as claimed in claim 2 or claim 3, it is characterised in that T values 5-10 days.
5. self discharge of lithium iron phosphate battery screening technique as claimed in claim 1, it is characterised in that I0 be 0.005C-
0.01C。
6. self discharge of lithium iron phosphate battery screening technique as claimed in claim 1, it is characterised in that I1, I2, I3 and I4 exist
Value between 0.02C -0.05C.
7. self discharge of lithium iron phosphate battery screening technique as claimed in claim 1, it is characterised in that step S2 is specially：It is right
Partial volume battery is treated, 3.0V is discharged to electric current 0.67C -1C, after standing 10-20min, is discharged to electric current 0.1C -0.5C
2.8V, after standing 10-20min, 2.8V is discharged to electric current 0.02C -0.05C.
8. self discharge of lithium iron phosphate battery screening technique as claimed in claim 1, it is characterised in that step S3 is specially：Treat
It is to treat that partial volume battery charges to 101%U1 with predetermined current I 1 after partial volume battery standing time t1；Step S4 is specially：Treat point
After holding battery standing time t2, using predetermined current I2 to treat partial volume battery discharge 99%U1.
9. self discharge of lithium iron phosphate battery screening technique as claimed in claim 1, it is characterised in that step S9 is specially：When
Δ V is more than change threshold, then judges that this treats partial volume battery for self discharge big battery.
10. self discharge of lithium iron phosphate battery screening technique as claimed in claim 1, it is characterised in that step S1 to S9 exists
Carried out under 25 ± 5 DEG C of temperature environment.
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Cited By (9)
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| CN108682908A (en) * | 2018-05-17 | 2018-10-19 | 惠州拓邦电气技术有限公司 | A kind of screening technique of lithium ion battery self discharge |
| CN110118941A (en) * | 2019-05-21 | 2019-08-13 | 泰兴市宁辉锂电池有限公司 | A kind of method of quick detection self discharge of lithium iron phosphate battery |
| CN110488201A (en) * | 2019-07-03 | 2019-11-22 | 浙江锋锂新能源科技有限公司 | A kind of charge states of lithium ion battery electric discharge screening technique, system, storage medium |
| CN112462277A (en) * | 2020-11-13 | 2021-03-09 | 珠海冠宇电池股份有限公司 | Method for detecting self-discharge performance of lithium ion battery |
| CN113376525A (en) * | 2021-06-15 | 2021-09-10 | 多氟多新能源科技有限公司 | Low-voltage selection method for lithium ion battery |
| CN114355212A (en) * | 2021-12-31 | 2022-04-15 | 珠海冠宇电池股份有限公司 | Battery self-discharge detection method and device, computer equipment and storage medium |
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| CN117872025A (en) * | 2024-03-11 | 2024-04-12 | 天津普兰能源科技有限公司 | Capacitor self-discharge selection method, system and consistency detection method |
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Cited By (12)
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| CN108607820A (en) * | 2018-04-20 | 2018-10-02 | 桑顿新能源科技有限公司 | A kind of low electric consumable electric sieve choosing method of LiFePO4 battery core |
| CN108682908A (en) * | 2018-05-17 | 2018-10-19 | 惠州拓邦电气技术有限公司 | A kind of screening technique of lithium ion battery self discharge |
| CN108682908B (en) * | 2018-05-17 | 2020-01-17 | 惠州拓邦电气技术有限公司 | Screening method for self-discharge of lithium ion battery |
| CN110118941A (en) * | 2019-05-21 | 2019-08-13 | 泰兴市宁辉锂电池有限公司 | A kind of method of quick detection self discharge of lithium iron phosphate battery |
| CN110488201A (en) * | 2019-07-03 | 2019-11-22 | 浙江锋锂新能源科技有限公司 | A kind of charge states of lithium ion battery electric discharge screening technique, system, storage medium |
| CN112462277A (en) * | 2020-11-13 | 2021-03-09 | 珠海冠宇电池股份有限公司 | Method for detecting self-discharge performance of lithium ion battery |
| WO2022206208A1 (en) * | 2021-03-31 | 2022-10-06 | 比亚迪股份有限公司 | Method and apparatus for determining voltage inflection point of cell in lfp battery, and medium and device |
| CN113376525A (en) * | 2021-06-15 | 2021-09-10 | 多氟多新能源科技有限公司 | Low-voltage selection method for lithium ion battery |
| CN113376525B (en) * | 2021-06-15 | 2024-02-23 | 多氟多新能源科技有限公司 | Low-voltage selection method for lithium ion battery |
| CN114355212A (en) * | 2021-12-31 | 2022-04-15 | 珠海冠宇电池股份有限公司 | Battery self-discharge detection method and device, computer equipment and storage medium |
| CN114355212B (en) * | 2021-12-31 | 2023-10-31 | 珠海冠宇电池股份有限公司 | Battery self-discharge detection method, device, computer equipment and storage medium |
| CN117872025A (en) * | 2024-03-11 | 2024-04-12 | 天津普兰能源科技有限公司 | Capacitor self-discharge selection method, system and consistency detection method |
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