CN104166102B - 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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- CN104166102B CN104166102B CN201410417704.9A CN201410417704A CN104166102B CN 104166102 B CN104166102 B CN 104166102B CN 201410417704 A CN201410417704 A CN 201410417704A CN 104166102 B CN104166102 B CN 104166102B
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000002159 abnormal effect Effects 0.000 claims abstract description 7
- 238000012360 testing method Methods 0.000 abstract description 2
- 238000007599 discharging Methods 0.000 abstract 10
- 229910018095 Ni-MH Inorganic materials 0.000 description 4
- 229910018477 Ni—MH Inorganic materials 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 230000005611 electricity Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000003446 memory effect Effects 0.000 description 3
- 229910003160 β-NiOOH Inorganic materials 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 229910002640 NiOOH Inorganic materials 0.000 description 1
- 229910018502 Ni—H Inorganic materials 0.000 description 1
- 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
- 239000000295 fuel oil Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000005457 optimization 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
- 229910006279 γ-NiOOH Inorganic materials 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 present invention relates to a kind of SOC of set of cells is using interval decision method, particularly to a kind of Vehicular dynamic battery
The SOC of group is using interval decision method.
Background technology
21 century is the challenge epoch that human society faces energy shortage and environmental pollution improvement：Petroleum resources subtract year by year
Few, oil price progressively rises, and reduces auto-pollution and energy saving 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 is become.In hybrid vehicle, high-power due to employing
Energy storage device provides instantaneous energy can reduce size of engine to automobile, improves efficiency, reduces discharge and fuel oil disappears
Consumption, and can recover energy when being braked and slow down.Ni-MH power cell has safe, the high-specific-power, long-life, resistance to
Super-charge super-discharge, recycling capable of circulation, the excellent overall characteristic such as pollution-free, are that current hybrid-electric car application is the most consentient
Battery system, is also unique scale the battery system through extensive actual verification.In order to ensure cell safety and car load control
The execution of system strategy, the research of HEV automobile batteries management system (BMS) is particularly important.Wherein SOC is main as battery behavior
Influence factor, for BMS management and control battery SOC using interval be all the time batteries management system study heat
One of point and difficult point.Existing HEV Ni-MH power cell group SOC using interval evaluation methodology is, monitored by BMS and
Management SOC is using interval, but SOC estimation error affects so that cannot obtain with factors such as use time, temperature, electric currents
Relatively accurate set of cells SOC using interval, thus impact HEV Ni-H 2 power cannot be known in car load factory and Battery Plant up till now
The SOC of set of cells is using interval.
Content of the invention
The present invention is intended to provide a kind of SOC of Vehicular dynamic battery group simple to operate is using interval decision method.
The present invention is realized by below scheme：
A kind of SOC of Vehicular dynamic battery group using interval decision method, take onboard using and through a spacing
Vehicular dynamic battery group after the examination of road, at a temperature of certain environment, after shelving certain time, is filled using certain charging current
Electricity to blanking voltage is the terminal voltage under certain SOC state, after shelving certain time, is discharged to phase using certain discharge current
Answer the corresponding blanking voltage of discharge current, obtain total discharge time；According to the discharge curve drawing, find flex point A, B, wherein,
In discharge curve, discharge voltage decrease speed starts abnormal point as flex point A, reduction of speed under discharge voltage in discharge curve
Degree terminates the normal point of abnormal restoring and is flex point B, the SOC value according to corresponding to formula (1) calculates flex point A, B,
The SOC that SOC value scope corresponding to discharge curve between flex point A, B is Vehicular dynamic battery group uses area
Between.
Described charging current is 0.5C～4C, and the blanking voltage of charging is the terminal voltage under 65%～95%SOC state.Institute
Stating discharge current is 0.2C～3C.
Further, described charging current is preferably 1C～3C, and the blanking voltage of charging is preferably 75%～85%SOC shape
Terminal voltage under state.
Further, described discharge current is preferably 0.25C～1C.
For making test data more accurate, can preferably be used for analysis and use, generally 23～27 DEG C of described ambient temperature.
The battery carrying on HEV, in order to improve being filled with and releasing performance of its electric power, can retain some uncharged parts simultaneously
Make it keep certain electricity, discharge and recharge is then locally repeated, it is to avoid fully charged.Although so not occurring on surface
Charge, but be because that conductive material can not possibly completely the same be uniformly distributed, thus leading to local that overcharge can occur.Due to Ni
(OH)2Lack electric conductivity, so typically Co compound all can be added as conductive material.If Ni (OH)2In particle, exist not
There is the isolated β-Ni (OH) contacting with Co compound2Particle, the β-Ni (OH) contacting with Co compound during charging2Particle can be first
First it is oxidized to β-NiOOH.But in electrode, there is the isolated β-Ni (OH) not contacted with Co compound2Particle, at it
Be oxidized to β-NiOOH before, conductive network prosperity position generation first β-NiOOH can be further oxided into γ-
NiOOH.Therefore, if carrying out local charge and discharge cycles, in conductive network flourishing part, charging current concentration of local can occur,
So that Ni is extremely some is locally generated γ-NiOOH, result in memory effect.
The inventive method, simple to operate and the SOC of Vehicular dynamic battery group can be quickly found out using interval, be Battery Plant and
Automobile factory provides accurate SOC using interval reference data, is conducive to Battery Plant technical staff and automobile factory technology people
The common optimization design of member, so that the SOC of Vehicular dynamic battery group uses interval as far as possible in scope of design, is conducive to automobile-used dynamic
Power set of cells is preferably applied on hybrid vehicle, extends the service life of set of cells.
Brief description
Fig. 1：The discharge curve of automobile-used Ni-MH power cell group in embodiment 1
Fig. 2：The discharge curve of automobile-used Ni-MH power cell group in embodiment 2
Specific embodiment
The invention will be further described with reference to embodiments, but the invention is not limited in the statement of embodiment.
Embodiment 1
Take on XX hybrid electric vehicle using and in certain proving ground, average rate is travelled on the road of ramp and controls 20
Any 4 groups of ni-mh D6000 × 6 Vehicular dynamic battery groups in～30km/h, the battery bag after 2.6 ten thousand kilometers of the examination of roads, 23
Under～27 DEG C of ambient temperatures, after shelving 5min, using 13A charging current for charging to blanking voltage for 8.771V (without the examination of road
Ni-mh D6000 × 6 Vehicular dynamic battery group is fully charged with same charging current, the 85%SOC shape finding on charging curve
Corresponding charging voltage under state), after shelving 5min, be discharged to blanking voltage 6.0V using 2A discharge current, 4 Battery pack groups total
Discharge time is respectively 149min, 146.4min, 146.4min, 146.4min, and its discharge curve is as shown in figure 1,4 Battery pack groups
The point that discharge voltage decrease speed starts to occur exception in discharge curve is to be flex point A corresponding discharge time
102.8min, it is that flex point B corresponds to that 4 Battery pack groups discharge voltage decrease speed in discharge curve terminates the normal point of abnormal restoring
Discharge time be 133.4min, respectively by data substitution formula calculate, the corresponding SOC value of flex point A of 4 Battery pack groups
It is respectively 25.67%, 24.22%, 24.22%, 24.22%, the corresponding SOC value of flex point B of 4 Battery pack groups is respectively
8.67%th, 7.22%, 7.22%, 7.22%, show that the SOC of this 4 groups of Vehicular dynamic battery groups is respectively 8.67% using interval
～25.67%, 7.22%～24.22%, 7.22%～24.22%, 7.22%～24.22%, estimate this 4 groups of power train in vehicle application electricity
Pond group produce on this car memory effect interval be respectively 8.67%～25.67%SOC, 7.22%～24.22%SOC,
7.22%～24.22%SOC, 7.22%～24.22%SOC.
Embodiment 2
Take on XX hybrid electric vehicle using and travel average rate in certain proving ground under comprehensive road condition and control
Any 4 groups of ni-mh D6000 × 6 Vehicular dynamic battery groups in 60～80km/h, the battery bag after 8.6 ten thousand kilometers of the examination of roads,
Under 23～27 DEG C of ambient temperatures, after shelving 5min, using 13A charging current for charging to blanking voltage for 8.771V (without the examination of road
Ni-mh D6000 × 6 Vehicular dynamic battery group fully charged with same charging current, the 85%SOC that finds on charging curve
Corresponding charging voltage under state), after shelving 5min, it is discharged to blanking voltage 6.0V using 2A discharge current, 4 Battery pack groups
Total discharge time is respectively 168.10min, 166.20min, 169.52min, 168.63min, and its discharge curve is as shown in Fig. 24
The point that Battery pack group discharge voltage decrease speed in discharge curve starts to occur exception is to be flex point A corresponding discharge time
12.8min, it is that flex point B corresponds to that 4 Battery pack groups discharge voltage decrease speed in discharge curve terminates the normal point of abnormal restoring
Discharge time be 38.4min, respectively by data substitution formula calculate, the corresponding SOC value of flex point A of 4 Battery pack groups
It is respectively 86.28%, 85.22%, 87.07%, 86.57%, the corresponding SOC value of flex point B of 4 Battery pack groups is respectively
72.06%th, 71.00%, 72.84%, 72.35%, show that the SOC of this 4 groups of Vehicular dynamic battery groups is respectively using interval
72.06%～86.28%, 71.00%～85.22%, 72.84%～87.07%%, 72.35%～86.57%, estimate this 4
Group Vehicular dynamic battery group produces on this car the interval respectively 72.06%～86.28%SOC of memory effect, 71.00%～
85.22%SOC, 72.84%～87.07%%SOC, 72.35%～86.57%SOC.
Claims (5)
1. a kind of SOC of Vehicular dynamic battery group using interval decision method it is characterised in that：Take onboard using simultaneously warp
Cross the Vehicular dynamic battery group after certain distance the examination of road, at a temperature of certain environment, after shelving certain time, filled using certain
Electric current charges to the terminal voltage that blanking voltage is under 65%～95%SOC state, after shelving certain time, is put using certain
Electric current discharge, to the corresponding blanking voltage of corresponding discharge current, obtains total discharge time；According to the discharge curve drawing, find
Flex point A, B, wherein, in discharge curve, discharge voltage decrease speed starts abnormal point as flex point A, puts in discharge curve
Piezoelectric voltage decrease speed terminates the normal point of abnormal restoring and is flex point B, the SOC according to corresponding to formula (1) calculates flex point A, B
Value,
SOC value scope corresponding to discharge curve between flex point A, B is the SOC of Vehicular dynamic battery group using interval.
2. the SOC of Vehicular dynamic battery group as claimed in claim 1 using interval decision method it is characterised in that：Described
Charging current is 0.5C～4C.
3. the SOC of Vehicular dynamic battery group as claimed in claim 1 using interval decision method it is characterised in that：Described
Discharge current is 0.2C～3C.
4. the SOC of Vehicular dynamic battery group as claimed in claim 2 using interval decision method it is characterised in that：Described
Charging current is 1C～3C, and the blanking 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 using interval decision method it is characterised in that：Described
Discharge current is 0.25C～1C.
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| KR102066703B1 (en) | 2017-01-24 | 2020-01-15 | 주식회사 엘지화학 | Apparatus and method for managing a battery |
| CN107656210B (en) * | 2017-09-14 | 2020-01-21 | 广州市香港科大霍英东研究院 | Method for estimating battery electric quantity state |
| CN109669143B (en) * | 2019-01-30 | 2021-01-29 | 中航锂电（洛阳）有限公司 | Battery pack capacity evaluation method |
| CN109870655B (en) * | 2019-03-26 | 2019-12-03 | 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 |
| KR20210046407A (en) * | 2019-10-18 | 2021-04-28 | 주식회사 엘지화학 | Apparatus and method for estimating state of charge |
| 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 |
| CN113049961B (en) * | 2021-02-26 | 2022-07-19 | 佛山职业技术学院 | DZSOC algorithm of lithium iron phosphate battery |
| 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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