CN104393636A - Battery system usable charge or discharge power estimating method - Google Patents

Battery system usable charge or discharge power estimating method Download PDF

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Publication number
CN104393636A
CN104393636A CN201410621859.4A CN201410621859A CN104393636A CN 104393636 A CN104393636 A CN 104393636A CN 201410621859 A CN201410621859 A CN 201410621859A CN 104393636 A CN104393636 A CN 104393636A
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value
battery system
power
battery
setting
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CN104393636B (en
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刘飞
文锋
阮旭松
王占国
肖方义
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Huizhou Epower Electronics Co Ltd
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Huizhou Epower Electronics Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention provides a battery system usable charge or discharge power estimating method. The method includes the following steps that: preliminary estimated usable charge or discharge power can be obtained through current SOC values and temperature values of batteries; and the usable charge or discharge power can be calculated through an equation PC=KC*PB_C and PD=KD*PB_D, wherein KC=a-kf1_C*(tC-bC), and KD=a-kf1_D*(tD-bD). With the battery system usable charge or discharge power estimating method adopted, difference of the consistency of the batteries is considered, and estimated power is more approximate to actual usable power, and therefore, damage to the battery system which is caused by excessive use of the battery system can be avoided; and power can be controlled before faults are reported, so that the failure of the battery system can be prevented, and the controllability of vehicle driving can be improved; a plurality of power values are calculated, and a minimum power value is obtained through comparison, and therefore, results are more accurate, and high safety can be realized; and the actual characteristics of the batteries are considered, and vehicle energy recovery and power supply of vehicles can be maximized, and therefore, the rate of fuel oil saving and power supply can be maximized.

Description

A kind of battery system can use the evaluation method of charge or discharge power
Technical field
The present invention relates to the evaluation method that a kind of battery system power calculation algorithms, particularly a kind of battery system can use charge or discharge power.
Background technology
Automobile travel process in owing to there is various working, as brake, acceleration etc.For electric automobile, when vehicle brake or other need reclaim vehicle energy to need when battery system as much as possible by the recover kinetic energy of vehicle in battery system, simultaneously must prevent again battery from the process of energy regenerating, being damaged battery system by overcharging; Battery system need be used to provide when power in vehicle acceleration or other to need to bring the power capability of battery system into play acceleration with lifting vehicle as much as possible, battery must be prevented again to be excessively discharged in the process providing power and to damage battery system simultaneously.Need a kind of rational solution to reach the maximization of battery system utilization and not damage battery in these cases.
Summary of the invention
In view of this, the technical problem to be solved in the present invention is to provide the evaluation method that a kind of battery system closer to actual value can use charge or discharge power.
For solving the problems of the technologies described above, technical scheme provided by the invention is: a kind of battery system with the evaluation method of charge power, can comprise the steps:
S1. electric automobile is when braking or other need reclaim vehicle energy, and the SOC value current according to electrokinetic cell system and temperature value obtain electrokinetic cell system preresearch estimates in this case by the mode of tabling look-up and can use charge power P b_C.
S2., when electric automobile starts recuperated energy, the time b that upper limit threshold values that a certain parameter value of battery exceeds setting reaches setting is detected ctime, revising battery system can be P by charge power value computing formula c=K c* P b_C, wherein K c=a-k f1_C* (t c-b c);
Wherein, a is a fixed value, represents K cthe maximum rating of value; k f1_Cvalue is calibration value, and its size determines P cfall off rate; t cthe time of the upper limit threshold values of setting is exceeded, t for a certain parameter value c>b c, b crepresent that the available horsepower of setting starts the time declined.
Described upper limit threshold values can be set as the threshold values of multiple different brackets for identical product.
Described k f1_Cvalue and b cbe worth and demarcate according to battery behavior and vehicle working condition feature.
Described a certain parameter value can be set as maximum cell voltage value or maximum monomer current value.
Described available charge power value draws by sample multiple SOC value and temperature value and selects minimum available charge power value.
An evaluation method for battery system available discharge power, is characterized in that, comprise the steps:
S1. electric automobile is when accelerating or battery system need be used to provide power for other, and the SOC value current according to electrokinetic cell system and temperature value obtain electrokinetic cell system preresearch estimates available discharge power P in this case by the mode of tabling look-up b_D.
S2., when electric automobile starts to accelerate or other operating mode needs battery system to provide power, a certain parameter value detecting battery reaches the time b of setting lower than the lower limit threshold values of setting dtime, now revising battery system available horsepower value computing formula is P d=K d* P b_D, wherein K d=a-k f1_D* (t d-b d);
Wherein, a is a fixed value, represents K cor K dthe maximum rating of value; k f1_Dvalue is calibration value, and its size determines P dfall off rate; t dfor minimum cell voltage value is lower than the time of the lower limit threshold values of setting, t d>b d, b drepresent that the available horsepower of setting starts the time declined.
Described lower limit threshold values can be set as the threshold values of multiple different brackets for identical product.
Described k f1_Dvalue and b dbe worth and demarcate according to battery behavior and vehicle working condition feature.
Described a certain parameter value can be set as minimum cell voltage value or minimum monomer current value.
Described available discharge performance number draws by sample multiple SOC value and temperature value and selects minimum available discharge performance number.
Compared with prior art, tool of the present invention has the following advantages:
The invention provides a kind of battery system with the evaluation method of charge or discharge power, the difference problem of battery with two side terminals to be considered, make estimated power closer to actual available horsepower, therefore can ensure that battery system is not overused and damages; Adopt the method for monomer battery voltage correction, before fault reports, power is controlled, and prevents battery system fault, improves the handling of vehicle drive; Adopt and calculate multiple performance number, and compare the method drawing lowest power value, make the result that draws more accurately and fail safe is higher; And the method take into account the actual characteristic of battery, realize vehicle energy maximizing and reclaim and provide with power, rate of economizing gasoline can be promoted to greatest extent and power provides.
Accompanying drawing explanation
Fig. 1 is monomer voltage of the present invention change, actual available charge power changes and estimates available charge power variation diagram;
Wherein, PC is available charge power estimation curve, and its numerical value unit is kilowatt (kw), and PA is actual available charge power curve, and its numerical value unit is kilowatt (kw), and V is monomer voltage change curve, its numerical value unit be volt (v).
Embodiment
The present invention to be explained in further detail below in conjunction with accompanying drawing and embodiment for the ease of it will be appreciated by those skilled in the art that.
Embodiment
Battery system can use an evaluation method for charge or discharge power, and the present embodiment is with ternary battery for objective for implementation, and the threshold values under normal circumstances a certain parameter value of battery being exceeded setting reaches regular hour f cbe defined as and overcharge, the threshold values of multiple different brackets can be set for same battery parameter value, described parameter value can be set as maximum cell voltage value or maximum monomer current value, as ternary battery does not allow monomer voltage higher than 4.2V more than 20S, monomer voltage is not allowed to reach 2S higher than 4.25V; Certain parameter value of battery is reached regular hour f lower than the threshold values set dbe defined as over-discharge can, can set the threshold values of multiple different brackets for same parameters, described parameter value can be set as minimum cell voltage value or minimum monomer current value, as ternary battery does not allow monomer voltage lower than 2.8V more than 20S, monomer voltage is not allowed to reach 2S lower than 2.5V, f cand f dbe worth and demarcate according to battery behavior and vehicle working condition feature; This battery system for ternary battery can comprise the steps: with the evaluation method of charge power
S1. electric automobile is when braking or other need reclaim vehicle energy, and the SOC value that five electrokinetic cell systems of sampling are current and temperature value obtain the preresearch estimates in this case of five electrokinetic cell systems by the mode of tabling look-up and can use charge power P b_C;
S2., when electric automobile starts recuperated energy, the power that the upper limit threshold values 4.2V that the maximum cell voltage value detecting ternary battery exceeds setting reaches setting starts b fall time c(S), time, now revising battery system can be P by charge power value computing formula c=K c* P b_C, wherein K c=a-k f1_C* (t c-b c); For ternary battery, the present embodiment a value is 1, represents 100%, represents K cthe maximum rating of value; b cthe available charge power that value is setting starts the time declined, t cexceed the time of the upper limit threshold values of setting for maximum cell voltage value, work as t cvalue is greater than b cduring value, P cvalue starts to reduce, and k f1_Cvalue determine P cbe worth and decline with speed how soon, t cbe worth the time threshold values f close to setting cnamely during 20S, K cbe worth less, thus show that battery system can use charge power P cbe worth less; 20S is no more than higher than 4.2V, k with bonding bulk voltage f1_Cand b cthe setting of value is all determined with the real work situation of battery.The available charge power value P of five preresearch estimatess in step S1 is gone out by above-mentioned formulae discovery b_Ccorresponding available charge power P c, and draw minimum available charge power value by contrast.
When electric automobile starts recuperated energy, the power that another upper limit threshold values 4.25V that the maximum cell voltage value of ternary battery exceeds setting if detect reaches setting starts the time b declined c(S), time, now revising battery system can be P by charge power value computing formula c=K c* P b_C, wherein K c=a-k f1_C* (t c-b c); For ternary battery, the present embodiment a value is 1, represents 100%, represents K cthe maximum rating of value; b cthe available charge power that value is setting starts the time declined, t cexceed the time of the upper limit threshold values of setting for maximum cell voltage value, work as t cvalue is greater than b cduring value, P cvalue starts to reduce, and k f1_Cvalue determine P cbe worth and decline with speed how soon, t cbe worth the time threshold values f close to setting cnamely during 2S, K cbe worth less, thus show that battery system can use charge power P cbe worth less; 2S is no more than higher than 4.25V, k with bonding bulk voltage f1_Cand b cthe setting of value is all determined with the real work situation of battery.The available charge power value P of five preresearch estimatess in step S1 is gone out by above-mentioned formulae discovery b_Ccorresponding available charge power P c, and draw minimum available charge power value by contrast.
This battery system for ternary battery can comprise the steps: with the evaluation method putting power
S1. electric automobile is when accelerating or battery system need be used to provide power for other, and the SOC value that five electrokinetic cell systems of sampling are current and temperature value obtain five electrokinetic cell systems preresearch estimates available discharge power P in this case by the mode of tabling look-up b_D;
S2., when electric automobile starts to accelerate or other operating mode needs battery system to provide power, detect that the minimum amount of voltage that of ternary battery reaches the time b of the power drop of setting lower than the lower limit threshold values 2.8V of setting d(S), time, now revising battery system available horsepower value computing formula is P d=K d* P b_D, wherein K d=a-k f1_D* (t d-b d); For ternary battery, the present embodiment a value is 1, represents 100%, represents K cthe maximum rating of value; b dthe available discharge power that value is setting starts the time declined, t dfor minimum cell voltage value is lower than the time of the lower limit threshold values of setting, work as t dvalue is greater than b dduring value, P dvalue should start to reduce, and k f1_Dvalue determine P dbe worth and decline with speed how soon, t dbe worth the time threshold values f close to setting dnamely during 20S, K dbe worth less, thus show that battery system can use charge power P dbe worth less; 20S is no more than lower than 2.8V, k with bonding bulk voltage f1_Dand b dthe setting of value is all determined with the real work situation of battery.The available charge power value P of five preresearch estimatess in step S1 is gone out by above-mentioned formulae discovery b_Ccorresponding available charge power P c, and draw minimum available charge power value by contrast.
When electric automobile starts to accelerate or other operating mode needs battery system to provide power, the minimum amount of voltage that detecting ternary battery starts the time b declined lower than the power that lower limit threshold values 2. 5V of setting reaches setting d(S), time, now revising battery system available horsepower value computing formula is P d=K d* P b_D, wherein K d=a-k f1_D* (t d-b d); For ternary battery, the present embodiment a value is 1, represents 100%, b dthe available discharge power that value is setting starts the time declined, t dfor minimum cell voltage value is lower than the time of the lower limit threshold values of setting, work as t dvalue is greater than b dduring value, P dvalue should start to reduce, and k f1_Dvalue determine P dbe worth and decline with speed how soon, t dbe worth the time threshold values f close to setting dnamely during 2S, K dbe worth less, thus show that battery system can use charge power P dbe worth less; 2S is no more than lower than 2.5V, k with bonding bulk voltage f1_Dand b dthe setting of value is all determined with the real work situation of battery.The available charge power value P of five preresearch estimatess in step S1 is gone out by above-mentioned formulae discovery b_Ccorresponding available charge power P c, and draw minimum available charge power value by contrast.
Above-mentioned steps S1, S2 report entire car controller to calculate by battery management system.
Be illustrated in figure 1 and calculate the change of gained monomer voltage, actual available charge power change and estimate available charge power variation diagram, can find out adopt the method for the invention to calculate available horsepower and actual available horsepower comparatively close.
Be more than wherein specific implementation of the present invention, it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these apparent replacement forms all belong to protection scope of the present invention.

Claims (10)

1. battery system with an evaluation method for charge power, can is characterized in that, comprise the steps:
S1. electric automobile is when braking or other need reclaim vehicle energy, and the SOC value current according to electrokinetic cell system and temperature value obtain electrokinetic cell system preresearch estimates in this case by the mode of tabling look-up and can use charge power P b_C;
S2., when electric automobile starts recuperated energy, the time b that upper limit threshold values that a certain parameter value of battery exceeds setting reaches setting is detected ctime, revising battery system can be P by charge power value computing formula c=K c* P b_C, wherein K c=a-k f1_C* (t c-b c);
Wherein, a is a fixed value, represents K cthe maximum rating of value; k f1_Cvalue is calibration value, and its size determines P cfall off rate; t cthe time of the upper limit threshold values of setting is exceeded, t for a certain parameter value c>b c, b crepresent that the available horsepower of setting starts the time declined.
2. battery system according to claim 1 with the evaluation method of charge power, can is characterized in that: described upper limit threshold values can be set as the threshold values of multiple different brackets for identical product.
3. battery system according to claim 1 with the evaluation method of charge power, can is characterized in that: described k f1_Cvalue and b cbe worth and demarcate according to battery behavior and vehicle working condition feature.
4. battery system according to claim 1 with the evaluation method of charge power, can is characterized in that: described a certain parameter value can be set as maximum cell voltage value or maximum monomer current value.
5. battery system according to claim 1 with the evaluation method of charge power, can is characterized in that: described available charge power value draws by sample multiple SOC value and temperature value and selects minimum available charge power value.
6. an evaluation method for battery system available discharge power, is characterized in that, comprises the steps:
S1. electric automobile is when accelerating or battery system need be used to provide power for other, and the SOC value current according to electrokinetic cell system and temperature value obtain electrokinetic cell system preresearch estimates available discharge power P in this case by the mode of tabling look-up b_D;
S2., when electric automobile starts to accelerate or other operating mode needs battery system to provide power, a certain parameter value detecting battery reaches the time b of setting lower than the lower limit threshold values of setting dtime, now revising battery system available horsepower value computing formula is P d=K d* P b_D, wherein K d=a-k f1_D* (t d-b d);
Wherein, a is a fixed value, represents K cor K dthe maximum rating of value; k f1_Dvalue is calibration value, and its size determines P dfall off rate; t dfor minimum cell voltage value is lower than the time of the lower limit threshold values of setting, t d>b d, b drepresent that the available horsepower of setting starts the time declined.
7. the evaluation method of battery system available discharge power according to claim 6, is characterized in that: described lower limit threshold values can be set as the threshold values of multiple different brackets for identical product.
8. the evaluation method of battery system available discharge power according to claim 6, is characterized in that: described k f1_Dvalue and b dbe worth and demarcate according to battery behavior and vehicle working condition feature.
9. the evaluation method of battery system available discharge power according to claim 6, is characterized in that: described a certain parameter value can be set as minimum cell voltage value or minimum monomer current value.
10. the evaluation method of battery system available discharge power according to claim 6, is characterized in that: described available discharge performance number draws by sample multiple SOC value and temperature value and selects minimum available discharge performance number.
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Cited By (16)

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CN105244947A (en) * 2015-10-14 2016-01-13 奇瑞汽车股份有限公司 Electric automobile battery charging and discharging power protection method
CN106019161A (en) * 2016-05-18 2016-10-12 北京新能源汽车股份有限公司 Method for assessing state of power battery pack of electric car, and battery management system
CN106125002A (en) * 2016-08-23 2016-11-16 北京新能源汽车股份有限公司 The method of testing of electrokinetic cell peak power, device
CN106314170A (en) * 2016-08-18 2017-01-11 重庆长安汽车股份有限公司 Power calculation method and system for power battery system and electric vehicle
CN106864290A (en) * 2017-03-09 2017-06-20 重庆长安汽车股份有限公司 A kind of battery management method, battery management system for electric automobile
CN107102271A (en) * 2017-05-25 2017-08-29 宁德时代新能源科技股份有限公司 Estimation method, device and system for peak power of battery pack
CN107972498A (en) * 2016-10-21 2018-05-01 蔚来汽车有限公司 Power distribution method and system for electric vehicle
CN107985090A (en) * 2017-11-02 2018-05-04 国机智骏（北京）汽车科技有限公司 Charging method, device, battery management system and the electric automobile of power battery
CN108072844A (en) * 2017-12-15 2018-05-25 重庆长安汽车股份有限公司 A kind of Vehicular dynamic battery available power evaluation method
CN108162968A (en) * 2016-12-05 2018-06-15 郑州宇通客车股份有限公司 Power output control method and device, power back off control method and device
CN108226797A (en) * 2018-01-02 2018-06-29 国机智骏（北京）汽车科技有限公司 The evaluation method of power battery SOP, device and with its vehicle
CN108790876A (en) * 2018-06-06 2018-11-13 北京新能源汽车股份有限公司 A kind of method of adjustment, device and the automobile of electric vehicle feedback power
CN109278588A (en) * 2018-10-24 2019-01-29 重庆长安汽车股份有限公司 A method of control lithium battery temperature
CN110231565A (en) * 2019-04-11 2019-09-13 惠州市亿能电子有限公司 A kind of battery nominal power evaluation method
CN112677769A (en) * 2020-12-28 2021-04-20 重庆大学 Battery system power limit estimation method based on multi-factor fusion
CN113836714A (en) * 2021-09-22 2021-12-24 重庆云宸新能源科技有限公司 Multi-constraint battery available power estimation system and method based on battery state

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CN105244947A (en) * 2015-10-14 2016-01-13 奇瑞汽车股份有限公司 Electric automobile battery charging and discharging power protection method
CN106019161A (en) * 2016-05-18 2016-10-12 北京新能源汽车股份有限公司 Method for assessing state of power battery pack of electric car, and battery management system
CN106019161B (en) * 2016-05-18 2019-10-25 北京新能源汽车股份有限公司 The appraisal procedure and battery management system of electric vehicle dynamic cell group state
CN106314170B (en) * 2016-08-18 2018-12-28 重庆长安汽车股份有限公司 A kind of power calculation algorithms of electrokinetic cell system, system and electric car
CN106314170A (en) * 2016-08-18 2017-01-11 重庆长安汽车股份有限公司 Power calculation method and system for power battery system and electric vehicle
CN106125002A (en) * 2016-08-23 2016-11-16 北京新能源汽车股份有限公司 The method of testing of electrokinetic cell peak power, device
CN106125002B (en) * 2016-08-23 2019-04-05 北京新能源汽车股份有限公司 The test method of power battery peak power, device
CN107972498A (en) * 2016-10-21 2018-05-01 蔚来汽车有限公司 Power distribution method and system for electric vehicle
CN108162968A (en) * 2016-12-05 2018-06-15 郑州宇通客车股份有限公司 Power output control method and device, power back off control method and device
CN106864290A (en) * 2017-03-09 2017-06-20 重庆长安汽车股份有限公司 A kind of battery management method, battery management system for electric automobile
CN106864290B (en) * 2017-03-09 2019-03-26 重庆长安汽车股份有限公司 A kind of battery management method for electric car, battery management system
CN107102271A (en) * 2017-05-25 2017-08-29 宁德时代新能源科技股份有限公司 Estimation method, device and system for peak power of battery pack
CN107985090A (en) * 2017-11-02 2018-05-04 国机智骏（北京）汽车科技有限公司 Charging method, device, battery management system and the electric automobile of power battery
CN108072844A (en) * 2017-12-15 2018-05-25 重庆长安汽车股份有限公司 A kind of Vehicular dynamic battery available power evaluation method
CN108072844B (en) * 2017-12-15 2020-04-07 重庆长安汽车股份有限公司 Method for estimating available power of vehicle power battery
CN108226797A (en) * 2018-01-02 2018-06-29 国机智骏（北京）汽车科技有限公司 The evaluation method of power battery SOP, device and with its vehicle
CN108226797B (en) * 2018-01-02 2020-08-07 国机智骏（北京）汽车科技有限公司 Power battery SOP estimation method and device and vehicle with same
CN108790876B (en) * 2018-06-06 2020-08-04 北京新能源汽车股份有限公司 Method and device for adjusting feedback power of electric automobile and automobile
CN108790876A (en) * 2018-06-06 2018-11-13 北京新能源汽车股份有限公司 A kind of method of adjustment, device and the automobile of electric vehicle feedback power
CN109278588B (en) * 2018-10-24 2020-06-12 重庆长安汽车股份有限公司 Method for controlling temperature of lithium battery
CN109278588A (en) * 2018-10-24 2019-01-29 重庆长安汽车股份有限公司 A method of control lithium battery temperature
CN110231565A (en) * 2019-04-11 2019-09-13 惠州市亿能电子有限公司 A kind of battery nominal power evaluation method
CN112677769A (en) * 2020-12-28 2021-04-20 重庆大学 Battery system power limit estimation method based on multi-factor fusion
CN113836714A (en) * 2021-09-22 2021-12-24 重庆云宸新能源科技有限公司 Multi-constraint battery available power estimation system and method based on battery state

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