CN109061513A - Test method for improving cycle life of lithium iron phosphate power lithium battery - Google Patents
Test method for improving cycle life of lithium iron phosphate power lithium battery Download PDFInfo
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- CN109061513A CN109061513A CN201811110719.5A CN201811110719A CN109061513A CN 109061513 A CN109061513 A CN 109061513A CN 201811110719 A CN201811110719 A CN 201811110719A CN 109061513 A CN109061513 A CN 109061513A
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- current
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- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 22
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 18
- 238000010998 test method Methods 0.000 title claims abstract description 16
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 title abstract 2
- 238000007600 charging Methods 0.000 claims abstract description 21
- 229910052493 LiFePO4 Inorganic materials 0.000 claims description 14
- 230000005611 electricity Effects 0.000 claims 1
- 238000012360 testing method Methods 0.000 abstract description 20
- 238000000034 method Methods 0.000 abstract description 9
- 230000010287 polarization Effects 0.000 abstract description 4
- 238000011217 control strategy Methods 0.000 abstract description 3
- 238000010277 constant-current charging Methods 0.000 abstract 6
- 125000004122 cyclic group Chemical group 0.000 abstract 3
- 238000007599 discharging Methods 0.000 abstract 1
- 239000005955 Ferric phosphate Substances 0.000 description 4
- 229940032958 ferric phosphate Drugs 0.000 description 4
- WBJZTOZJJYAKHQ-UHFFFAOYSA-K iron(3+) phosphate Chemical compound [Fe+3].[O-]P([O-])([O-])=O WBJZTOZJJYAKHQ-UHFFFAOYSA-K 0.000 description 4
- 229910000399 iron(III) phosphate Inorganic materials 0.000 description 4
- 238000010281 constant-current constant-voltage charging Methods 0.000 description 3
- 230000014759 maintenance of location Effects 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 229960001484 edetic acid Drugs 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000012956 testing procedure Methods 0.000 description 1
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Abstract
A test method for improving the cycle life of a lithium iron phosphate power lithium battery can solve the technical problems of short cycle life and long test time of the lithium battery. The method comprises the steps of adopting two-to-three steps of constant current charging and one-step constant current discharging, wherein during the constant current charging, a large current is used for constant current charging to be higher than a platform voltage, and then a small current is used for constant current charging to be a charging cut-off voltage; after standing, the discharge is performed with constant current until the discharge cutoff voltage. According to the invention, through the cyclic test method of converting large-current constant-current charging into small-current constant-current charging, the charging rate of the charging end section is reduced, so that the polarization of the battery is reduced, and on one hand, the test cycle of the cyclic life can be shortened on the basis of ensuring the cyclic life of the battery; on the other hand, the method is closer to the charging mode of the whole vehicle, and can provide effective suggestions for the charging control strategy of the whole vehicle.
Description
Technical field
The present invention relates to technical field of lithium ion, and in particular to a kind of improvement LiFePO4 dynamic lithium battery circulation longevity
The test method of life.
Background technique
In recent years, in the case where new-energy automobile encouragement policy persistently stimulates, the multiplication of new-energy automobile market demand, electric car
Come into the popularity stage.However, client is not only safety, course continuation mileage for the demand of electric car, also make
With the requirement in service life and charging time, this is also the key that can electric car popularize.
At this stage, the cycle life test of battery generallys use the side of GB/T31484-2015 testing standard cycle life
Method uses 1C constant-current constant-voltage charging, after standing, 1C constant-current discharge.With the aging of battery, the internal resistance of cell and polarization constantly increase
Add, constant-voltage phase when constant-current constant-voltage charging also obviously increases.And the trickle charge strategy of vehicle battery pack is substantially small multiplying power
Constant-current charge, without constant-voltage phase, the charging time, generally longer than 6 hours.On the one hand, prolonged cycle life evaluation and test affects
The development cycle of battery, on the other hand, being charged as many clients for a long time makes troubles, and becomes and hinder potential customers' purchase
Factor.
Summary of the invention
A kind of test method improving LiFePO4 dynamic lithium battery cycle life proposed by the present invention, can solve lithium battery
Cycle life is shorter and testing time longer technical problem.
To achieve the above object, the invention adopts the following technical scheme:
A kind of test method improving LiFePO4 dynamic lithium battery cycle life, two to three step constant-current charge of use and one
Constant-current discharge is walked, high current constant-current charge to platform voltage or more is wherein first used when constant-current charge, reuses low current constant current
Charge to charge cutoff voltage；After standing, constant-current discharge to discharge cut-off voltage.
Preferably, described its size of current of high current constant-current charge is the maximum allowable 0.8-1 for continuing charging current of battery
Times.
Preferably, more than the large current charge to platform voltage refer to that capacity reaches 50-90%SOC or voltage reaches
3.45-3.55V。
Preferably, described its size of current of low current constant-current charge is the maximum allowable 0.2- for continuing charging current of battery
0.5 times.
Preferably, the constant-current charge blanking voltage is 3.65V.
Preferably, the constant-current discharge size of current is the 1C of battery rated capacity.
Preferably, the constant-current discharge blanking voltage is 2.00V.
A kind of test method improving LiFePO4 dynamic lithium battery cycle life, including
As shown from the above technical solution, the invention proposes a kind of surveys for improving LiFePO4 dynamic lithium battery cycle life
Method for testing accelerates power of battery decaying and the service life declines because high-power charging cycle often will cause anode impedance increase
Subtract, which is charged by gradient, and the rate of charge for reducing charging latter end can improve to reduce the polarization of battery
The cycle life of battery, while substantially reducing battery charge time, and battery charge control strategy in actual use can be taken into account.
The beneficial effects of the present invention are:
The high current constant-current charge turns the loop test mode of low current constant-current charge, reduces the charging times of charging latter end
Rate, to reduce the polarization of battery, on the one hand, the test of cycle life can be shortened on the basis of guaranteeing battery cycle life
Period；On the other hand, this method can be provided for the charge control strategy of vehicle and effectively be built closer to the charging modes of vehicle
View.
Detailed description of the invention
Fig. 1 is the method for the present invention flow chart；
Fig. 2 is the loop-around data of test of the embodiment of the present invention.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.
As shown in Figure 1, a kind of test method of improvement LiFePO4 dynamic lithium battery cycle life of the embodiment of the present invention,
The following steps are included:
S10, it is charged to mesuring battary more than or equal to platform voltage with high current constant current；
S20, use low current constant-current charge to charge cutoff voltage again；
S30, it stands for the first time；
S40, constant-current discharge to discharge cut-off voltage is used；
S50, it stands for second.
According to above-mentioned steps, specific test case is as follows:
Comparative example
Under the conditions of 25 DEG C of room temperature, the cylinder ferric phosphate lithium cell that rated capacity is 12Ah is followed according to following work step
Ring life test: 1) 0.5C constant-current charge to 3.65V, constant-voltage charge to 0.05C (charging time about 2h5min)；2) it stands
10min；3) 1C constant-current discharge is to 2.00V；4) 10min is stood.Capacity retention ratio in record circulation, test result are shown in Table 1.
Embodiment 1
Under the conditions of 25 DEG C of room temperature, the cylinder ferric phosphate lithium cell that rated capacity is 12Ah is followed according to following work step
Ring life test: 1) 1C constant-current charge to 3.5V, 0.5C constant-current charge to 3.65V (charging time about 1h16min)；2) it stands
10min；3) 1C constant-current discharge is to 2.00V；4) 10min is stood.Capacity retention ratio in record circulation, test result are shown in Table 1.
Embodiment 2
Under the conditions of 25 DEG C of room temperature, the cylinder ferric phosphate lithium cell that rated capacity is 12Ah is followed according to following work step
Ring life test: 1) 0.8C constant-current charge to 3.55V, 0.5C constant-current charge to 3.65V (charging time about 1h23min)；2) quiet
Set 10min；3) 1C constant-current discharge is to 2.00V；4) 10min is stood.Capacity retention ratio in record circulation, test result are shown in Table 1.
Embodiment 3
Under the conditions of 25 DEG C of room temperature, the cylinder ferric phosphate lithium cell that rated capacity is 12Ah is followed according to following work step
Ring life test: 1) 1C constant-current charge to 3.45V, 0.5C constant-current charge to 3.55V, 0.2C constant-current charge to 3.65V is (when charging
Between about 1h44min)；2) 10min is stood；3) 1C constant-current discharge is to 2.00V；4) 10min is stood.Capacity in record circulation is kept
Rate, testing procedure is as shown in table 1, and loop-around data is as shown in Figure 1.
| Comparison/embodiment | Loop test charging work step |
| Comparative example | 0.5C constant-current charge is to 3.65V, constant-voltage charge to 0.05C |
| Embodiment 1 | 1C constant-current charge is to 3.5V, 0.5C constant-current charge to 3.65V |
| Embodiment 2 | 0.8C constant-current charge is to 3.55V, 0.5C constant-current charge to 3.65V |
| Embodiment 3 | 1C constant-current charge is to 3.45V, 0.5C constant-current charge to 3.55V, 0.2C constant-current charge to 3.65V |
Table 1
It can be seen that, the method that high current constant-current charge of the invention turns low current constant-current charge, recycle in conjunction with table 1 and Fig. 1
Data can shorten under the premise of guaranteeing battery cycle life and follow better than the method for the constant-current constant-voltage charging that this battery core is recommended
The ring test time.
The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to the foregoing embodiments
Invention is explained in detail, those skilled in the art should understand that: it still can be to aforementioned each implementation
Technical solution documented by example is modified or equivalent replacement of some of the technical features；And these modification or
Replacement, the spirit and scope for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution.
Claims (7)
1. a kind of test method for improving LiFePO4 dynamic lithium battery cycle life, which is characterized in that specifically include following step
It is rapid:
S10, it is charged to mesuring battary more than or equal to platform voltage with high current constant current；
S20, use low current constant-current charge to charge cutoff voltage again；
S30, it stands for the first time；
S40, constant-current discharge to discharge cut-off voltage is used；
S50, it stands for second.
2. the test method according to claim 1 for improving LiFePO4 dynamic lithium battery cycle life, it is characterised in that:
High current constant current described in step S10 is maximum allowable 0.8-1 times for continuing charging current of the mesuring battary.
3. the test method according to claim 1 for improving LiFePO4 dynamic lithium battery cycle life, it is characterised in that:
It is more than or equal to 50-90%SOC or electricity to be measured that mesuring battary platform voltage refers to mesuring battary rated capacity in the step S20
Cell voltage is in 3.45V-3.55V.
4. the test method according to claim 1 for improving LiFePO4 dynamic lithium battery cycle life, it is characterised in that:
The step S20 small current constant current is maximum allowable 0.2-0.5 times for continuing charging current of battery.
5. the test method according to claim 1 for improving LiFePO4 dynamic lithium battery cycle life, it is characterised in that:
Charge cutoff voltage is 3.65V in the step S20.
6. the test method according to claim 1 for improving LiFePO4 dynamic lithium battery cycle life, it is characterised in that:
Constant-current discharge in the step S40 is with the 1C electric current constant-current discharge of battery rated capacity.
7. the test method according to claim 1 for improving LiFePO4 dynamic lithium battery cycle life, it is characterised in that:
Discharge cut-off voltage is 2.00V in the step S40.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110988726A (en) * | 2019-11-25 | 2020-04-10 | 安徽绿沃循环能源科技有限公司 | Method for detecting service life of lithium battery of electric bicycle |
| CN111380996A (en) * | 2018-12-29 | 2020-07-07 | 宁德时代新能源科技股份有限公司 | Rapid detection method for cycle life of anode material |
| CN112599876A (en) * | 2020-12-22 | 2021-04-02 | 江苏双登富朗特新能源有限公司 | Regulation and control method for prolonging service life of lithium ion battery pack |
| CN112666482A (en) * | 2020-12-24 | 2021-04-16 | 合肥国轩高科动力能源有限公司 | Method and system for testing cycle life of lithium ion battery |
| CN112946502A (en) * | 2019-12-11 | 2021-06-11 | 珠海冠宇电池股份有限公司 | Method for rapidly testing cycle life of lithium ion battery |
| CN112946505A (en) * | 2019-12-11 | 2021-06-11 | 珠海冠宇电池股份有限公司 | Method for rapidly testing cycle life of lithium ion battery |
| CN112946504A (en) * | 2019-12-11 | 2021-06-11 | 珠海冠宇电池股份有限公司 | Method for rapidly testing cycle life of lithium ion battery |
| CN113219360A (en) * | 2021-06-02 | 2021-08-06 | 江苏中兴派能电池有限公司 | Lithium battery cycle life testing method based on floating charge strategy |
| CN114122542A (en) * | 2021-10-08 | 2022-03-01 | 江西省汇亿新能源有限公司 | Charging method for prolonging cycle life of lithium iron phosphate battery |
| CN114397351A (en) * | 2022-01-19 | 2022-04-26 | 湖南裕能新能源电池材料股份有限公司 | Method for rapidly evaluating cycle performance of lithium iron phosphate positive electrode material |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112946505A (en) * | 2019-12-11 | 2021-06-11 | 珠海冠宇电池股份有限公司 | Method for rapidly testing cycle life of lithium ion battery |
| CN112946504A (en) * | 2019-12-11 | 2021-06-11 | 珠海冠宇电池股份有限公司 | Method for rapidly testing cycle life of lithium ion battery |
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| CN112946504B (en) * | 2019-12-11 | 2023-03-14 | 珠海冠宇电池股份有限公司 | Method for rapidly testing cycle life of lithium ion battery |
| CN112599876A (en) * | 2020-12-22 | 2021-04-02 | 江苏双登富朗特新能源有限公司 | Regulation and control method for prolonging service life of lithium ion battery pack |
| CN112666482A (en) * | 2020-12-24 | 2021-04-16 | 合肥国轩高科动力能源有限公司 | Method and system for testing cycle life of lithium ion battery |
| CN113219360A (en) * | 2021-06-02 | 2021-08-06 | 江苏中兴派能电池有限公司 | Lithium battery cycle life testing method based on floating charge strategy |
| CN113219360B (en) * | 2021-06-02 | 2023-09-22 | 江苏中兴派能电池有限公司 | Lithium battery cycle life testing method based on float strategy |
| CN114122542A (en) * | 2021-10-08 | 2022-03-01 | 江西省汇亿新能源有限公司 | Charging method for prolonging cycle life of lithium iron phosphate battery |
| CN114397351A (en) * | 2022-01-19 | 2022-04-26 | 湖南裕能新能源电池材料股份有限公司 | Method for rapidly evaluating cycle performance of lithium iron phosphate positive electrode material |
| CN114397351B (en) * | 2022-01-19 | 2024-01-12 | 湖南裕能新能源电池材料股份有限公司 | Method for rapidly evaluating cycle performance of lithium iron phosphate positive electrode material |
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Application publication date: 20181221 |