CN110221223A - A kind of estimation on line method of lithium ion battery SOH - Google Patents
A kind of estimation on line method of lithium ion battery SOH Download PDFInfo
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- CN110221223A CN110221223A CN201910380607.XA CN201910380607A CN110221223A CN 110221223 A CN110221223 A CN 110221223A CN 201910380607 A CN201910380607 A CN 201910380607A CN 110221223 A CN110221223 A CN 110221223A
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- battery
- soc
- internal resistance
- soh
- direct current
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
Abstract
The present invention provides the estimation on line method of lithium ion battery SOH a kind of comprising the steps of: applies the isopulse direct-current discharge electric current i of 1-10s at the both ends of battery0；Monitoring battery discharge time is Δ t1Battery both end voltage V before and after=1~2ms1、V2, and obtain Δ V1=V1‑V2；Δ t after monitoring cell pulse discharge2=1~2ms tests battery rear and front end voltage V3、V4, and obtain Δ V2=V4‑V3；Take average value Δ V=(Δ V of above-mentioned voltage twice1+ΔV2)/2；By formula R=Δ V/i0Battery impulse DC internal resistance R is calculated；According to above-mentioned steps, the pulse direct current internal resistance R of new battery is tested respectively0(SOC0, T0), pulse direct current internal resistance R when battery capacity drops to the 80% of initial new discharge capacity of the cellaged(SOCt,Tt) and electrical equipment start when, the pulse direct current internal resistance R of battery in the discharged conditiont(SOCt,Tt)；Finally according to formula S OHt=[Raged(SOCt,Tt)‑Rt(SOCt,Tt)]/[Raged(SOCt,Tt)‑R0(SOC0,T0)], calculate SOH at this timet.The present invention realizes battery impulse DC internal resistance and the on-line testing of SOH, and method is simple, and test result is accurate.
Description
Technical field
The present invention relates to battery evaluation technology fields, and in particular to a kind of estimation on line method of lithium ion battery SOH.
Background technique
The SOH(State Of Health of lithium ion battery) indicate lithium ion battery health status, be evaluation lithium ion
One very important quantity of state of cell degradation degree.The SOH of lithium ion battery is typically estimated as using internal resistance method at present, first surveys
The SOH for calculating battery is removed in the internal resistance for trying battery by internal resistance.But there is one very big, the online survey of internal resistance in internal resistance method
It tries extremely difficult, and is difficult to analyze.
Summary of the invention
To solve above-mentioned problems of the prior art, the present invention provides the estimation on line of lithium ion battery SOH a kind of
Method realizes battery impulse DC internal resistance and the on-line testing of SOH, and method is simple, and test result is accurate.
In order to achieve the above object, the present invention adopts the following technical scheme:
A kind of estimation on line method of lithium ion battery SOH, which is characterized in that comprise the steps of:
Step 1: applying the isopulse direct-current discharge electric current i of a 1-10s at the both ends of mesuring battary0；
Step 2: monitoring battery discharge time is Δ t1Battery both end voltage V before and after=1~2ms1、V2, and obtain Δ V1= V1-V2；
Step 3: Δ t after monitoring cell pulse discharge2=1~2ms tests battery rear and front end voltage V3、V4, and obtain Δ V2=
V4-V3；
Step 4: taking obtained in step 2 and step 3 average value of voltage twice, obtain Δ V=(Δ V1+ΔV2)/2；
Step 5: by formula R=Δ V/i0Battery impulse DC internal resistance R is calculated；
Step 6: according to step 1 ~ step 5, testing the pulse direct current internal resistance R of new battery under different condition0(SOC0, T0)；
Step 7: according to step 1 ~ step 5, when test battery capacity drops to the 80% of initial new discharge capacity of the cell, different items
Pulse direct current internal resistance R under partaged(SOCt,Tt)；
Step 8: according to step 1 ~ step 5, when testing electrical equipment starting, the pulse direct current internal resistance R of battery in the discharged conditiont
(SOCt,Tt), according to formula S OHt=[Raged(SOCt,Tt)-Rt(SOCt,Tt)]/[Raged(SOCt,Tt)-R0(SOC0,T0)], meter
Calculate SOH at this timet。
Further, SOC in the step 60And T0It should meet respectively: 0.2≤SOC0≤ 0.8 and 0≤T0≤25℃。
Further, the SOH of new battery is defined0It is 1.
Further, pulse direct current internal resistance R obtained in the step 8tLess than new battery obtained in the step 6
Pulse direct current internal resistance R0When, then SOHtIt is denoted as 1.
Compared with prior art, advantageous effects of the invention are as follows: a kind of lithium ion battery SOH's of the invention is online
Evaluation method realizes battery impulse DC internal resistance and the on-line testing of SOH, and method is simple, and test result is accurate, is suitable for each
The detection of kind electrical equipment lithium ion battery.
Detailed description of the invention
Fig. 1 is lithium ion battery pulse direct current electric discharge internal resistance measurement schematic illustration.
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
The technical solution of the embodiment of the present invention is clearly and completely described.Obviously, described embodiment is of the invention one
Divide embodiment, instead of all the embodiments.Based on described the embodiment of the present invention, those of ordinary skill in the art are obtained
The every other embodiment obtained, shall fall within the protection scope of the present invention.
A kind of estimation on line method of lithium ion battery SOH comprising the steps of:
Step 1: applying the isopulse direct-current discharge electric current i of a 1-10s at the both ends of mesuring battary0；
Step 2: monitoring battery discharge time is Δ t1Battery both end voltage V before and after=1~2ms1、V2, and obtain Δ V1= V1-V2；
Step 3: Δ t after monitoring cell pulse discharge2=1~2ms tests battery rear and front end voltage V3、V4, and obtain Δ V2=
V4-V3；
Step 4: taking obtained in step 2 and step 3 average value of voltage twice, obtain Δ V=(Δ V1+ΔV2)/2；
Step 5: by formula R=Δ V/i0Battery impulse DC internal resistance R is calculated；
Step 6: according to step 1 ~ step 5, testing the pulse direct current internal resistance R of new battery under different condition0(SOC0, T0)；
Step 7: according to step 1 ~ step 5, when test battery capacity drops to the 80% of initial new discharge capacity of the cell, different items
Pulse direct current internal resistance R under partaged(SOCt,Tt)；
Step 8: according to step 1 ~ step 5, when testing electrical equipment starting, the pulse direct current internal resistance R of battery in the discharged conditiont
(SOCt,Tt), according to formula S OHt=[Raged(SOCt,Tt)-Rt(SOCt,Tt)]/[Raged(SOCt,Tt)-R0(SOC0,T0)], meter
Calculate SOH at this timet。
Wherein, SOC in step 60And T0It should meet respectively: 0.2≤SOC0≤ 0.8 and 0≤T0≤25℃。
Define the SOH of new battery0It is 1.
Pulse direct current internal resistance R obtained in step 8tLess than the pulse direct current internal resistance R of new battery obtained in step 60When,
Then SOHtIt is denoted as 1.
Test result accuracy verifying of the present invention:
With the data instance explanation tested at 25 DEG C, when certain new 18650 ternary lithium ion battery 50%SOC of cylinder, in pulse direct current
Resistance is 26.4m Ω, and after long-time 0.5C charges 0.5C discharge cycles burn-in test, pulse direct current internal resistance is under 50%SOC
43.3 mΩ.The numerical value of pulse direct current internal resistance is recorded after different charge and discharge cycles numbers.
After the 300th charge and discharge cycles, the capacity of battery has decaying, and discharge capacity of the cell is new battery capacity at this time
94.1%, SOH is calculated to obtain with capacity attenuationa=0.941；The pulse direct current internal resistance tested under 50%SOC is 27.5 m Ω, then SOHb=
0.935, with SOHa=0.941 is close；
After the 500th charge and discharge cycles, the capacity of battery has decaying, and capacity is the 90.3% of new battery capacity at this time, uses capacity
SOH is calculated to obtain in decayingc=0.903；The pulse direct current internal resistance tested under 50%SOC is 28.1 m Ω, then SOHd=0.893, with SOHc=
0.903 is close；
As known from the above, the resulting SOH value of estimation on line method and capacity attenuation method of battery SOH provided by the invention are resulting
SOH value is very close, and the SOH value precision that the estimation on line method of battery SOH of the invention obtains is high.
The estimation on line method of lithium ion battery SOH of the invention a kind of realizes battery impulse DC internal resistance and SOH
On-line testing, method is simple, and test result is accurate, the detection suitable for various electrical equipment lithium ion batteries.
The above is a preferred embodiment of the present invention, it is noted that for those skilled in the art
For, without departing from the principles of the present invention, it can also make several improvements and retouch, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (4)
1. a kind of estimation on line method of lithium ion battery SOH, which is characterized in that comprise the steps of:
Step 1: applying the isopulse direct-current discharge electric current i of a 1-10s at the both ends of mesuring battary0；
Step 2: monitoring battery discharge time is Δ t1Battery both end voltage V before and after=1~2ms1、V2, and obtain Δ V1= V1-V2；
Step 3: Δ t after monitoring cell pulse discharge2=1~2ms tests battery rear and front end voltage V3、V4, and obtain Δ V2=
V4-V3；
Step 4: taking obtained in step 2 and step 3 average value of voltage twice, obtain Δ V=(Δ V1+ΔV2)/2；
Step 5: by formula R=Δ V/i0Battery impulse DC internal resistance R is calculated；
Step 6: according to step 1 ~ step 5, testing the pulse direct current internal resistance R of new battery under different condition0(SOC0, T0)；
Step 7: according to step 1 ~ step 5, when test battery capacity drops to the 80% of initial new discharge capacity of the cell, different items
Pulse direct current internal resistance R under partaged(SOCt,Tt)；
Step 8: according to step 1 ~ step 5, when testing electrical equipment starting, the pulse direct current internal resistance R of battery in the discharged conditiont
(SOCt,Tt), according to formula S OHt=[Raged(SOCt,Tt)-Rt(SOCt,Tt)]/[Raged(SOCt,Tt)-R0(SOC0,T0)], meter
Calculate SOH at this timet。
2. the estimation on line method of lithium ion battery SOH according to claim 1 a kind of, which is characterized in that the step 6
Middle SOC0And T0It should meet respectively: 0.2≤SOC0≤ 0.8 and 0≤T0≤25℃。
3. the estimation on line method of lithium ion battery SOH according to claim 1 a kind of, which is characterized in that the new electricity of definition
The SOH in pond0It is 1.
4. the estimation on line method of lithium ion battery SOH according to claim 1 a kind of, which is characterized in that the step 8
Obtained in pulse direct current internal resistance RtLess than the pulse direct current internal resistance R of new battery obtained in the step 60When, then SOHtIt is denoted as
1。
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| CN110646742A (en) * | 2019-10-15 | 2020-01-03 | 桑顿新能源科技(长沙)有限公司 | Power battery SOH acquisition method, system and related assembly |
| WO2021208661A1 (en) * | 2020-04-15 | 2021-10-21 | 深圳市云伽智能技术有限公司 | Automobile starting load measuing method and apparatus, device, and storage medium |
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