CN103487757A - Method for simulating battery self discharge rate - Google Patents
Method for simulating battery self discharge rate Download PDFInfo
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- CN103487757A CN103487757A CN201310395979.2A CN201310395979A CN103487757A CN 103487757 A CN103487757 A CN 103487757A CN 201310395979 A CN201310395979 A CN 201310395979A CN 103487757 A CN103487757 A CN 103487757A
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Abstract
The invention discloses a method for simulating the battery self discharge rate. The method is capable of quickly and accurately simulating the battery self discharge rate and solving the problems that at present, the self discharge rate of a battery can not be accurately simulated, and the judgment for the performance parameters of the battery is not accurate. A constant resistor is externally connected according to the different voltage conditions of the battery, so that the self discharge currents of the battery can be simulated, the external self discharge rate of the battery can be calculated, the self discharge rate of the battery itself is added so that the total self discharge rate of the battery can be calculated, and therefore the different self discharge rate of the battery is simulated. The method for simulating the battery self discharge rate is simple, quick and accurate, the performance parameters of the battery in different self discharge rates can be obtained, and meanwhile the battery performance simulation of different self discharge rates in the same battery can be achieved.
Description
Technical field
The present invention relates to a kind of self-discharge of battery rate analogy method, especially relate to a kind of method of permanent ohmic load battery simulated battery self-discharge rate.
Background technology
Accumulator is not with primary element when being connected with external circuit, and the battery capacity loss caused by inner spontaneous reaction, be commonly referred to as self discharge.With vol annual or loss per month, mean, as the self discharge of each lithium battery about 1%-2% per month, metal-hydrogen nickel battery reaches per month more than 10%.Due to the impact of starting material and production process, the self-discharge rate of a small amount of battery can reach the several times of normal battery, when connection in series-parallel is used together with normal battery when these batteries, tends to cause the hydraulic performance decline of whole group of feed circuit and unstable.Therefore be necessary the battery screening that those self-discharge rates is excessive out, process as off standard.
Patent about the self-discharge of battery rate mainly concentrates on the screening technique of self-discharge of battery rate at present, filters out the inconsistent battery of self-discharge rate or different self-discharge rate batteries are classified.Thereby the performance that will characterize different self-discharge rate batteries can only go to select then and characterized from the battery of having classified, can't carry out the simulation of different self-discharge rate performances to any one battery (or same battery), there is certain defect.If obtain the self-discharge rate of different batteries, need to the battery of One's name is legion be screened, workload is large, and different battery may introduce unpredictable influence factor, to the judgement of the performance parameter of battery, also can cause very large error.Therefore, be difficult to characterize some performance of battery under different self-discharge rates.
Summary of the invention
The object of the present invention is to provide a kind of method of quick and precisely simulated battery self-discharge rate, the present invention can realize the simulation of any self-discharge rate of battery, thereby obtain the performance parameter of battery under different self-discharge rates, and just can realize the performance simulation of battery under different self-discharge rates on a battery simultaneously.
Purpose of the present invention is achieved through the following technical solutions: a kind of self-discharge of battery rate analogy method, and its concrete steps are:
(1) by the battery of known self-discharge rate, add certain current density, make it in a certain voltage U;
(2) the constant resistance R of external different resistances
external, simulate the self discharge electric current I of this battery
external, I
external=U/R
external;
(3) calculate the external self-discharge rate of this battery, external self-discharge rate=(I
external* t/ battery capacity) * 100%;
(4) calculate total self-discharge rate of this battery, total self-discharge rate=external self-discharge rate+self self-discharge rate, thus obtain the performance parameter of this battery under different self-discharge rates.
Further, in the described first step, the battery of known self-discharge rate can be selected the battery that self-discharge rate is arbitrary value.
Further, the voltage in the described first step is not less than 2.0V, makes its not overdischarge.
Further, in described second step, constant resistance can be selected the resistance that resistance is arbitrary value, but constant resistance n(n=1,2,3...m) individual connected in series or in parallel.
The present invention has the following advantages: the present invention realizes the simulation of any self-discharge rate of battery by add the permanent resistance designed outside same battery or different battery, but not only Simple fast obtains the performance parameter of battery under different self-discharge rates exactly, and just can realize the performance simulation of battery under different self-discharge rates on same battery; And this method applicability is wide, all applicable to the battery of most of kinds.
The accompanying drawing explanation
The battery performance parameter curve map that Fig. 1 is the specific embodiment of the invention 1.
The battery performance parameter curve map that Fig. 2 is the specific embodiment of the invention 2.
The battery performance parameter curve map that Fig. 3 is the specific embodiment of the invention 3.
Embodiment
Below in conjunction with specific embodiment, the present invention will be further described, but protection scope of the present invention is not limited to the following stated.
Described method is for the simulation of self-discharge of battery rate, and its concrete steps are:
(1) by the battery of known self-discharge rate, add certain current density, make it in a certain voltage U;
(2) the constant resistance R of external different resistances
external, simulate the self discharge electric current I of this battery
external, I
external=U/R
external;
(3) calculate the external self-discharge rate of this battery, external self-discharge rate=(I
external* t/ battery capacity) * 100%;
(4) calculate total self-discharge rate of this battery, total self-discharge rate=external self-discharge rate+self self-discharge rate, thus obtain the performance parameter of this battery under different self-discharge rates.
Preferably, in the first step, the battery of known self-discharge rate can be selected the battery that self-discharge rate is arbitrary value.
Preferably, the voltage in the first step is not less than 2.0V, makes its not overdischarge.
Preferably, in second step, constant resistance can be selected the resistance that resistance is arbitrary value, but constant resistance n(n=1,2,3...m) individual connected in series or in parallel.
Embodiment 1:
(total self-discharge rate of hypothetical simulation is 2.5%/moon to observe different self-discharge rates, 5%/month, 7.5%/month, 10%/month) ferric phosphate lithium cell in the voltage bounce situation of a certain discharge process (supposing to be discharged to voltage is 2.0V), can be operated in accordance with the following methods:
1) pick out the ferric phosphate lithium cell that a capacity is 50 Ah, self-discharge rate is 2.5%/moon;
2) by battery discharge to 2.0V, an external constant resistance (resistance is 1150 Ω, 580 Ω, the resistance of 385 Ω respectively corresponding total self-discharge rate be 5%/month, 7.5%/month, 10%/month battery), total self-discharge rate is 2.5%/month battery outer meeting resistance not;
3) voltage of observing different self-discharge rate batteries is situation over time, the results are shown in Figure 1, can be observed in different time, the voltage bounce situation of the different self-discharge rate batteries of simulating is discrepant, after reaching the regular hour, when the magnitude of voltage rebounded continues to rise and tends towards stability, its bounce-back value is larger, shows that total self-discharge rate of this battery is less.
Embodiment 2:
Observe the voltage bounce situation of the lithium manganate battery of different self-discharge rates (total self-discharge rate of hypothetical simulation is 2.5%/moon, 5%/moon, 7.5%/moon) a certain discharge process (supposing to be discharged to voltage is 3.0V), can be operated in accordance with the following methods:
1) pick out the lithium manganate battery that a capacity is 50 Ah, self-discharge rate is 2.5%/moon;
2) by battery discharge to 3.0V, an external constant resistance (resistance is 1750 Ω, the resistance of 870 Ω respectively corresponding total self-discharge rate be 5%/month, 7.5%/month battery), total self-discharge rate is 2.5%/month battery outer meeting resistance not;
3) voltage of observing different self-discharge rate batteries is situation over time, the results are shown in Figure 2, can be observed in different time, the voltage bounce situation of the different self-discharge rate batteries of simulating is discrepant, after reaching the regular hour, when not lasting rising the, the decline gradually on the contrary of magnitude of voltage of bounce-back, if it is faster that the magnitude of voltage of bounce-back descends, show that total self-discharge rate of this battery is larger.
Embodiment 3:
Observe the voltage bounce situation of the ternary battery of different self-discharge rates (total self-discharge rate of hypothetical simulation is 2.5%/moon, 5%/moon, 7.5%/moon) a certain discharge process (supposing to be discharged to voltage is 2.5V), can be operated in accordance with the following methods:
1) pick out the ternary battery that a capacity is 50 Ah, self-discharge rate is 2.5%/moon;
2) by battery discharge to 2.5V, an external constant resistance (resistance is 1450 Ω, the resistance of 720 Ω respectively corresponding total self-discharge rate be 5%/month, 7.5%/month battery), total self-discharge rate is 2.5%/month battery outer meeting resistance not;
3) voltage of observing different self-discharge rate batteries is situation over time, the results are shown in Figure 3, can be observed in different time, the voltage bounce situation of the different self-discharge rate batteries of simulating is discrepant, after reaching the regular hour, when not lasting rising the, the decline gradually on the contrary of magnitude of voltage of bounce-back, if it is faster that the magnitude of voltage of bounce-back descends, show that total self-discharge rate of this battery is larger.
The above technical scheme that the embodiment of the present invention is provided is described in detail, applied specific case herein principle and the embodiment of the embodiment of the present invention are set forth, the explanation of above embodiment is only suitable in the principle that helps to understand the embodiment of the present invention; , for one of ordinary skill in the art, according to the embodiment of the present invention, on embodiment and range of application, all will change, in sum, this description should not be construed as limitation of the present invention simultaneously.
Claims (5)
1. a self-discharge of battery rate analogy method, is characterized in that, the steps include:
(1) by the battery of known self-discharge rate, add certain current density, make it in a certain voltage U;
(2) the constant resistance R of external different resistances
external, simulate the self discharge electric current I of this battery
external, I
external=U/R
external;
(3) calculate the external self-discharge rate of this battery, external self-discharge rate=(I
external* t/ battery capacity) * 100%;
(4) calculate total self-discharge rate of this battery, total self-discharge rate=external self-discharge rate+self self-discharge rate, thus obtain the performance parameter of this battery under different self-discharge rates.
2. self-discharge of battery rate analogy method according to claim 1, it is characterized in that: in the described first step, the battery of known self-discharge rate can be selected the battery that self-discharge rate is arbitrary value.
3. self-discharge of battery rate analogy method according to claim 1, it is characterized in that: the voltage U in the described first step is not less than 2.0V, makes its not overdischarge.
4. self-discharge of battery rate analogy method according to claim 1, it is characterized in that: in described second step, constant resistance can be selected the resistance that resistance is arbitrary value.
5. according to the described self-discharge of battery rate of claim 1 or 4 analogy method, it is characterized in that: constant resistance can by n (n=1,2,3...m) resistance is connected in series or in parallel.
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Cited By (3)
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|---|---|---|---|---|
| CN111744827A (en) * | 2020-06-24 | 2020-10-09 | 上海理工大学 | Method for sorting lithium battery cores |
| CN114325407A (en) * | 2021-12-31 | 2022-04-12 | 珠海冠宇电池股份有限公司 | Battery self-discharge test method, device, equipment and computer storage medium |
| CN117347887A (en) * | 2023-12-04 | 2024-01-05 | 宁德时代新能源科技股份有限公司 | Method, system and device for testing self-discharge of battery |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111744827A (en) * | 2020-06-24 | 2020-10-09 | 上海理工大学 | Method for sorting lithium battery cores |
| CN114325407A (en) * | 2021-12-31 | 2022-04-12 | 珠海冠宇电池股份有限公司 | Battery self-discharge test method, device, equipment and computer storage medium |
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| CN117347887A (en) * | 2023-12-04 | 2024-01-05 | 宁德时代新能源科技股份有限公司 | Method, system and device for testing self-discharge of battery |
| CN117347887B (en) * | 2023-12-04 | 2024-04-12 | 宁德时代新能源科技股份有限公司 | Method, system and device for testing self-discharge of battery |
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Address after: 101 Fujian Province, Jimei District, white rock road, No., unit 19, No. 361000 Applicant after: XIAMEN CHL NEW ENERGY CO., LTD. Address before: 361000, No. 19 tiger rock road, Jimei District, Fujian, Xiamen Applicant before: XIAMEN CHL NEW ENERGY CO., LTD. |
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