CN104166102A - Judgment method for SOC use interval of automotive power battery pack - Google Patents
Judgment method for SOC use interval of automotive power battery pack Download PDFInfo
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- CN104166102A CN104166102A CN201410417704.9A CN201410417704A CN104166102A CN 104166102 A CN104166102 A CN 104166102A CN 201410417704 A CN201410417704 A CN 201410417704A CN 104166102 A CN104166102 A CN 104166102A
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 230000002159 abnormal effect Effects 0.000 claims abstract description 9
- 230000007423 decrease Effects 0.000 claims description 8
- 238000012360 testing method Methods 0.000 abstract description 2
- 238000007599 discharging Methods 0.000 abstract 10
- 229910018095 Ni-MH Inorganic materials 0.000 description 5
- 229910018477 Ni—MH Inorganic materials 0.000 description 5
- 150000001875 compounds Chemical class 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 230000005611 electricity Effects 0.000 description 3
- 230000003446 memory effect Effects 0.000 description 3
- 229910003160 β-NiOOH Inorganic materials 0.000 description 3
- 239000011449 brick Substances 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000037361 pathway Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 229910006279 γ-NiOOH Inorganic materials 0.000 description 2
- 230000006399 behavior Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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Abstract
The invention provides a judgment method for an SOC use interval of an automotive power battery pack. The method includes the steps of taking the automotive power battery pack which has been used on an automobile and has passed a certain-distance road test, conducting charging with a certain charging current till the voltage is the terminal voltage in the certain SOC state after the automotive power battery pack is put aside for a certain period of time at a certain environment temperature, conducting discharging with a certain discharging current till the voltage is the cut-off voltage corresponding to the corresponding discharging current after the automotive power battery pack is put aside for a certain period of time, and obtaining the total discharging time; finding an inflection point A and an inflection point B according to an obtained discharging curve, wherein the point where the discharging voltage drop speed in the discharging curve begins to be abnormal is the inflection point A, and the point where the discharging voltage drop speed in the discharging curve returns to normal is the inflection point B; calculating the SOC values corresponding to the inflection point A and the inflection point B according to a corresponding formula, wherein the range of the SOC values corresponding to the portion, between the inflection point A and the inflection point B, of the discharging curve is the SOC use interval of the automotive power battery pack. The method is easy to operate, and the SOC use interval of the automotive power battery pack can be rapidly found.
Description
Technical field
The SOC that the present invention relates to a kind of electric battery uses interval decision method, and particularly a kind of SOC of Vehicular dynamic battery group uses interval decision method.
Background technology
21 century is the challenge epoch that human society faces energy shortage and environmental pollution improvement: petroleum resources reduce year by year, and oil price is progressively soaring, and reducing auto-pollution and saving the energy has become the Tough questions of countries in the world government faces.Because of battery technology and Cost Problems, exploitation hybrid vehicle is that situation becomes.In hybrid vehicle, owing to having adopted high-power energy storage device instantaneous energy to be provided and can to reduce size of engine to automobile, raise the efficiency, reduce discharge and fuel consume, and can in the time braking and slow down, recover energy.That Ni-MH power cell has is safe, high-specific-power, long-life, overcharging resisting are crossed and put, recycling capable of circulation, the excellent overall characteristic such as pollution-free; being the most consentient battery system of current hybrid-electric car application, is also unique scale, and through the battery system of extensive actual verification.In order to ensure the execution of cell safety and integrated vehicle control tactics, the research of HEV automobile batteries management system (BMS) is particularly important.Wherein SOC is as the topmost influence factor of battery behavior, and use interval for BMS management and the battery SOC controlled is one of the focus studied of batteries management system and difficult point all the time.Existing HEV uses interval evaluation method to be with Ni-MH power cell group SOC, monitoring and manage SOC by BMS uses interval, but SOC estimation error is along with factor impacts such as service time, temperature, electric currents, make to obtain relatively accurate electric battery SOC and use intervally, thereby have influence on current car load factory and Battery Plant, cannot to know that the SOC of HEV Ni-MH power cell group uses interval.
Summary of the invention
The SOC that the present invention aims to provide a kind of Vehicular dynamic battery group simple to operate uses interval decision method.
The present invention realizes by following scheme:
A kind of SOC of Vehicular dynamic battery group uses interval decision method, get use onboard the Vehicular dynamic battery group after the examination of certain distance road, at certain environment temperature, shelve after certain hour, using certain charging current for charging to cut-off voltage is the terminal voltage under certain SOC state, shelve after certain hour, use certain discharge current to be discharged to the cut-off voltage that corresponding discharge current is corresponding, obtain total discharge time; According to the discharge curve drawing; find flex point A, B; wherein; in discharge curve, sparking voltage decline rate starts to occur that abnormal point is flex point A; in discharge curve, sparking voltage decline rate finishes the normal point of abnormal restoring and is flex point B; calculate flex point A, the corresponding SOC value of B according to formula (1)
The SOC that the corresponding SOC value of discharge curve scope between flex point A, B is Vehicular dynamic battery group uses interval.
Described charging current is 0.5C～4C, and the cut-off voltage of charging is the terminal voltage under 65%～95%SOC state.Described discharge current is 0.2C～3C.
Further, described charging current is preferably 1C～3C, and the cut-off voltage of charging is preferably the terminal voltage under 75%～85%SOC state.
Further, described discharge current is preferably 0.25C～1C.
For making test data more accurate, can better be used for analyzing use, described environment temperature is generally 23～27 DEG C.
The battery of the upper lift-launch of HEV is filled with and emits performance for what improve its electric power, can retain some uncharged parts and make it keep certain electric weight, and then part discharges and recharges repeatedly, avoids being full of electricity.Although do not overcharge on surface like this because conductive material can not in full accord being uniformly distributed, thereby cause local understand overcharge.Due to Ni (OH)
2lack electric conductivity, so generally all can add Co compound as conductive material.If Ni (OH)
2in particle, there is the isolated β-Ni (OH) not contacting with Co compound
2particle, the β-Ni contacting with Co compound when charging (OH)
2first particle can be oxidized to β-NiOOH.But in electrode, there is the isolated β-Ni (OH) not contacting with Co compound
2particle, before they are oxidized to β-NiOOH, the β-NiOOH first producing at the flourishing position of conductive network can be further oxided into γ-NiOOH.Therefore, carry out local charge and discharge cycles, can charging current concentration of local occur in the flourishing part of conductive network, thereby make some local γ-NiOOH of generation of the Ni utmost point, caused memory effect.
The inventive method, simple to operate and can find fast the SOC of Vehicular dynamic battery group to use interval, for Battery Plant and automobile factory provide SOC comparatively accurately to use interval reference data, be conducive to the technician of Battery Plant and the common optimal design of the technician of automobile factory, make the SOC of Vehicular dynamic battery group use interval as far as possible in scope of design, be conducive to Vehicular dynamic battery group and be better applied on hybrid vehicle, extend the serviceable life of electric battery.
Brief description of the drawings
The discharge curve of automobile-used Ni-MH power cell group in Fig. 1: embodiment 1
The discharge curve of automobile-used Ni-MH power cell group in Fig. 2: embodiment 2
Embodiment
Below in conjunction with embodiment, the invention will be further described, but the present invention is not limited to the statement of embodiment.
embodiment 1
Get and on XX hybrid electric vehicle, use and on the road of ramp, be controlled at 20～30km/h with the average rate of travelling at certain proving ground, any 4 groups of ni-mh D6000 × 6 Vehicular dynamic battery groups in power brick after 2.6 ten thousand kilometers of road examinations, under 23～27 DEG C of environment temperatures, shelve after 5min, for 8.771V, (the ni-mh D6000 × 6 Vehicular dynamic battery group of pathway examination is not full of electricity with same charging current to cut-off voltage to use 13A charging current for charging, the charging voltage of correspondence under the 85%SOC state finding on charging curve), shelve after 5min, use 2A discharge current to be discharged to cut-off voltage 6.0V, be respectively 149min total discharge time of 4 Battery pack groups, 146.4min, 146.4min, 146.4min, its discharge curve as shown in Figure 1, 4 Battery pack groups sparking voltage decline rate in discharge curve starts to occur that abnormal point is to be discharge time that flex point A is corresponding 102.8min, it is to be discharge time that flex point B is corresponding 133.4min that 4 Battery pack groups sparking voltage decline rate in discharge curve finishes the normal point of abnormal restoring, respectively data substitution formula is calculated, the SOC value corresponding to flex point A of 4 Battery pack groups is respectively 25.67%, 24.22%, 24.22%, 24.22%, the SOC value corresponding to flex point B of 4 Battery pack groups is respectively 8.67%, 7.22%, 7.22%, 7.22%, the SOC that draws these 4 groups of Vehicular dynamic battery groups uses interval to be respectively 8.67%～25.67%, 7.22%～24.22%, 7.22%～24.22%, 7.22%～24.22%, infer the interval that these 4 groups of Vehicular dynamic battery groups produce memory effect on this car and be respectively 8.67%～25.67%SOC, 7.22%～24.22%SOC, 7.22%～24.22%SOC, 7.22%～24.22%SOC.
embodiment 2
Get and on XX hybrid electric vehicle, use and under comprehensive road condition, be controlled at 60～80km/h with the average rate of travelling at certain proving ground, any 4 groups of ni-mh D6000 × 6 Vehicular dynamic battery groups in power brick after 8.6 ten thousand kilometers of road examinations, under 23～27 DEG C of environment temperatures, shelve after 5min, for 8.771V, (the ni-mh D6000 × 6 Vehicular dynamic battery group of pathway examination is not full of electricity with same charging current to cut-off voltage to use 13A charging current for charging, the charging voltage of correspondence under the 85%SOC state finding on charging curve), shelve after 5min, use 2A discharge current to be discharged to cut-off voltage 6.0V, be respectively 168.10min total discharge time of 4 Battery pack groups, 166.20min, 169.52min, 168.63min, its discharge curve as shown in Figure 2, 4 Battery pack groups sparking voltage decline rate in discharge curve starts to occur that abnormal point is to be discharge time that flex point A is corresponding 12.8min, it is to be discharge time that flex point B is corresponding 38.4min that 4 Battery pack groups sparking voltage decline rate in discharge curve finishes the normal point of abnormal restoring, respectively data substitution formula is calculated, the SOC value corresponding to flex point A of 4 Battery pack groups is respectively 86.28%, 85.22%, 87.07%, 86.57%, the SOC value corresponding to flex point B of 4 Battery pack groups is respectively 72.06%, 71.00%, 72.84%, 72.35%, the SOC that draws these 4 groups of Vehicular dynamic battery groups uses interval to be respectively 72.06%～86.28%, 71.00%～85.22%, 72.84%～87.07%%, 72.35%～86.57%, infer the interval that these 4 groups of Vehicular dynamic battery groups produce memory effect on this car and be respectively 72.06%～86.28%SOC, 71.00%～85.22%SOC, 72.84%～87.07%%SOC, 72.35%～86.57%SOC.
Claims (5)
1. the SOC of a Vehicular dynamic battery group uses interval decision method, it is characterized in that: get use onboard the Vehicular dynamic battery group after the examination of certain distance road, at certain environment temperature, shelve after certain hour, using certain charging current for charging to cut-off voltage is the terminal voltage under certain SOC state, shelve after certain hour, use certain discharge current to be discharged to the cut-off voltage that corresponding discharge current is corresponding, obtain total discharge time; According to the discharge curve drawing; find flex point A, B; wherein; in discharge curve, sparking voltage decline rate starts to occur that abnormal point is flex point A; in discharge curve, sparking voltage decline rate finishes the normal point of abnormal restoring and is flex point B; calculate flex point A, the corresponding SOC value of B according to formula (1)
The SOC that the corresponding SOC value of discharge curve scope between flex point A, B is Vehicular dynamic battery group uses interval.
2. the SOC of Vehicular dynamic battery group as claimed in claim 1 uses interval decision method, it is characterized in that: described charging current is 0.5C～4C, and the cut-off voltage of charging is the terminal voltage under 65%～95%SOC state.
3. the SOC of Vehicular dynamic battery group as claimed in claim 1 uses interval decision method, it is characterized in that: described discharge current is 0.2C～3C.
4. the SOC of Vehicular dynamic battery group as claimed in claim 2 uses interval decision method, it is characterized in that: described charging current is 1C～3C, and the cut-off voltage of charging is the terminal voltage under 75%～85%SOC state.
5. the SOC of Vehicular dynamic battery group as claimed in claim 1 uses interval decision method, it is characterized in that: described discharge current is 0.25C～1C.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106597314A (en) * | 2017-01-16 | 2017-04-26 | 先进储能材料国家工程研究中心有限责任公司 | Vehicle NI-MH power battery pack actual charge maintenance and corresponding voltage determination method |
| CN107656210A (en) * | 2017-09-14 | 2018-02-02 | 广州市香港科大霍英东研究院 | A kind of method for estimating battery electric quantity state |
| CN109155446A (en) * | 2017-01-24 | 2019-01-04 | 株式会社Lg化学 | Device and method for managing battery |
| CN109669143A (en) * | 2019-01-30 | 2019-04-23 | 中航锂电（洛阳）有限公司 | A kind of battery capacity evaluating method |
| CN109870655A (en) * | 2019-03-26 | 2019-06-11 | 上海工程技术大学 | A kind of evaluation method for lithium battery SOC |
| CN110071337A (en) * | 2019-03-29 | 2019-07-30 | 中时讯通信建设有限公司 | A kind of base station storage batteries Life cycle optimization method |
| CN112578296A (en) * | 2019-09-27 | 2021-03-30 | 比亚迪股份有限公司 | Battery capacity estimation method and apparatus, and computer storage medium |
| CN113049961A (en) * | 2021-02-26 | 2021-06-29 | 佛山职业技术学院 | DZSOC algorithm of lithium iron phosphate battery |
| CN113315210A (en) * | 2021-07-07 | 2021-08-27 | 武汉问道信息技术有限公司 | Method and system for obtaining optimal working voltage of rechargeable battery and electronic equipment |
| CN113795760A (en) * | 2019-10-18 | 2021-12-14 | 株式会社Lg新能源 | SOC estimation apparatus and method |
| CN113866649A (en) * | 2020-06-30 | 2021-12-31 | 比亚迪股份有限公司 | Battery state calculation method, battery state calculation device, and storage medium |
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| CN106597314B (en) * | 2017-01-16 | 2019-03-15 | 先进储能材料国家工程研究中心有限责任公司 | The determination method of automobile-used Ni-MH power cell packet true charged holding and corresponding voltage |
| CN106597314A (en) * | 2017-01-16 | 2017-04-26 | 先进储能材料国家工程研究中心有限责任公司 | Vehicle NI-MH power battery pack actual charge maintenance and corresponding voltage determination method |
| US11125825B2 (en) | 2017-01-24 | 2021-09-21 | Lg Chem, Ltd. | Apparatus and method for managing battery |
| CN109155446A (en) * | 2017-01-24 | 2019-01-04 | 株式会社Lg化学 | Device and method for managing battery |
| CN109155446B (en) * | 2017-01-24 | 2021-10-19 | 株式会社Lg化学 | Apparatus and method for managing battery |
| CN107656210A (en) * | 2017-09-14 | 2018-02-02 | 广州市香港科大霍英东研究院 | A kind of method for estimating battery electric quantity state |
| CN109669143A (en) * | 2019-01-30 | 2019-04-23 | 中航锂电（洛阳）有限公司 | A kind of battery capacity evaluating method |
| CN109669143B (en) * | 2019-01-30 | 2021-01-29 | 中航锂电（洛阳）有限公司 | Battery pack capacity evaluation method |
| CN109870655A (en) * | 2019-03-26 | 2019-06-11 | 上海工程技术大学 | A kind of evaluation method for lithium battery SOC |
| CN110071337A (en) * | 2019-03-29 | 2019-07-30 | 中时讯通信建设有限公司 | A kind of base station storage batteries Life cycle optimization method |
| CN112578296B (en) * | 2019-09-27 | 2022-03-15 | 比亚迪股份有限公司 | Battery capacity estimation method and apparatus, and computer storage medium |
| CN112578296A (en) * | 2019-09-27 | 2021-03-30 | 比亚迪股份有限公司 | Battery capacity estimation method and apparatus, and computer storage medium |
| CN113795760A (en) * | 2019-10-18 | 2021-12-14 | 株式会社Lg新能源 | SOC estimation apparatus and method |
| CN113795760B (en) * | 2019-10-18 | 2024-05-17 | 株式会社Lg新能源 | SOC estimation apparatus and method |
| US12013440B2 (en) | 2019-10-18 | 2024-06-18 | Lg Energy Solution, Ltd. | SOC estimating apparatus and method |
| CN113866649A (en) * | 2020-06-30 | 2021-12-31 | 比亚迪股份有限公司 | Battery state calculation method, battery state calculation device, and storage medium |
| CN113049961A (en) * | 2021-02-26 | 2021-06-29 | 佛山职业技术学院 | DZSOC algorithm of lithium iron phosphate battery |
| CN113049961B (en) * | 2021-02-26 | 2022-07-19 | 佛山职业技术学院 | DZSOC algorithm of lithium iron phosphate battery |
| CN113315210A (en) * | 2021-07-07 | 2021-08-27 | 武汉问道信息技术有限公司 | Method and system for obtaining optimal working voltage of rechargeable battery and electronic equipment |
| CN113315210B (en) * | 2021-07-07 | 2023-11-24 | 武汉问道信息技术有限公司 | Method, system and electronic equipment for obtaining optimal working voltage of rechargeable battery |
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