CN101625398B - Calculation and alarm device for service life of battery of pure electric vehicle and control method thereof - Google Patents
Calculation and alarm device for service life of battery of pure electric vehicle and control method thereof Download PDFInfo
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 6
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- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
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- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
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- GOLXNESZZPUPJE-UHFFFAOYSA-N spiromesifen Chemical compound CC1=CC(C)=CC(C)=C1C(C(O1)=O)=C(OC(=O)CC(C)(C)C)C11CCCC1 GOLXNESZZPUPJE-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention relates to a battery service life calculation of a purely electric vehicle, an alarm device and a control method thereof. The service life of the battery of the electric vehicle is estimated through prediction of battery performance. The battery performance is predicted by adding the times of deep charge-discharge cycles of the battery, and when the times of deep charge-discharge cycles of the battery reaches a certain threshold value, a vehicle is supposed to warn a driver to replace a high-power vehicle battery.
Description
Technical field
The present invention relates to a kind of service life of battery of pure electric vehicle calculating and warning device and control method thereof; Realize embedded system to the monitoring of pure electric automobile battery status, control, consider that simultaneously factors such as battery temperature, state-of-charge and measuring error are to predicting the influence of battery life.
Background technology
China increases under the situation that international oil price significantly rises the demand of Imported oil fast; 2,400 ten thousand automobiles of China in 2003 have been burnt 7,000 ten thousand tons of gasoline; Account for 85% of national gasoline consumption total amount, automobile consumption oil has accounted for 1/3 of Chinese whole oil consumption at present; Estimate the year two thousand twenty, Chinese automobile output will reach about 2,000 ten thousand, and recoverable amount surpasses 1.3 hundred million, will burn 60% of oil total amount.
New-energy automobile is meant and adopts unconventional vehicle fuel as power resources (or using conventional vehicle fuel, employing novel on-vehicle propulsion system); The power control of comprehensive vehicle and the advanced technology of driving aspect, have the automobile of new technology, new construction at the know-why advanced person of formation.New-energy automobile includes: hybrid vehicle (HEV), pure electric automobile (EV), fuel cell car (FCEV), hydrogen engine automobile and gas combustion automobile, alcohol ether automobile or the like.
Under the pressure of the energy and environmental protection, new-energy automobile will become the developing direction of following automobile undoubtedly.If new-energy automobile obtains fast development, calculate with the year two thousand twenty Chinese automobile recoverable amount 1.4 hundred million, can practice thrift 3,229 ten thousand tons in oil, substitute 3,110 ten thousand tons in oil, totally 6,339 ten thousand tons in saving and alternative oil are equivalent to the gasoline demand is cut down 22.7%.The year two thousand twenty was practiced thrift in the past and alternative oil mainly relies on realizations such as the advanced diesel vehicle of development, hybrid vehicle.To the year two thousand thirty, the development of new-energy automobile will practice thrift 7,306 ten thousand tons in oil, substitute 9,100 ten thousand tons in oil, and totally 16,406 ten thousand tons in saving and alternative oil are equivalent to the automobile petroleum demand is cut down 41%.When the time comes, bio-fuel, fuel cell will play an important role in the automobile oil replacement.
The current fuel engines automobile power utilization factor of generally using is low, and exhaust emission is serious.In today of stressing environmental protection day by day; New-energy automobile has become an irreplaceable developing direction; Particularly pure electric automobile is progressively accepted by masses with the advantage of zero-emission; Technology is simple relatively ripe; But the life-span of automobile batteries has seemed into the bottleneck that restricts the pure electric automobile development as long as there is the place of electric power supply can both charge now, and detection and the method for reporting for automobile batteries life-span degree of aging just seems particularly important so, and this also is the technology barrier that we should cross over.
And discharge and recharge 2000 times according to the present lithium battery degree of depth, 80 kilometers of continuation of the journey mileages ran 40 kilometers calculating in one day, filled once electricity in two days, and battery life is about 8 years, but this is optimal state.Each battery cell all is in optimum condition.
For now, the health degree of each battery cell is all different, has several factors to influence the health degree of battery simultaneously; Such as temperature, humidity, dust; Lithium battery generally is composed in series by a plurality of cells, because factors such as the difference of the otherness that cell is made, environment for use, standing times, battery in use for some time; The otherness of battery cell performance can increase; And cell integrated performance is the decision of monomer that do as one likes can be the poorest, and therefore, the life-span of entire cell bag is shorter than the life-span of battery cell.
The electric motor car (comprising electric bicycle) on market now has only the demonstration of electric weight and does not have the demonstration of cell health state; That is to say that the consumer does not know when should change battery; Be by virtue of experience to feel to need to have changed battery fully; This is extremely unscientific, also is unsafe.The life-span of vehicular high-power battery can have a strong impact on the user mode of electric automobile, for the improper use of car lithium battery even can also initiation potential, the person is caused unnecessary damages.
In sum, have following technical matters in the prior art: do not have corresponding device thereof, method especially detects and reports automobile batteries life-span degree of aging, and in time makes prompting.
Summary of the invention
The object of the present invention is to provide a kind of service life of battery of pure electric vehicle calculating and warning device and control method thereof; Through method life-span of coming estimating battery of prediction battery performance; The principle of prediction battery performance is through the battery degree of depth charge and discharge cycles number of times that adds up, and automobile should remind the driver to change the vehicular high-power battery when battery degree of depth charge and discharge cycles number of times reaches certain threshold value.
What the present invention is directed to is that the electric motor car (comprising electric bicycle) on market now has only the demonstration of electric weight and do not have the problem of the demonstration of cell health state; The consumer by virtue of experience feels to need to have changed battery in the prior art; This is extremely unscientific, also is unsafe.The life-span of vehicular high-power battery can have a strong impact on the user mode of electric automobile, for the improper use of car lithium battery even can also initiation potential, the person is caused unnecessary damages.
BMS involved in the present invention (battery management system) system is the part of pure electric automobile (Electrical Vehicle), and it can realize alarm lamp management, systemic-function restriction or function such as forbid.The present invention has realized the battery life warning function of BMS system with comparatively simple method.Transmit signal through CAN and give VMS (central controller), and on panel board, show, let the open-and-shut health degree of knowing battery of driver, so that before battery life arrives the time limit, change battery through display lamp.
Concrete technical scheme is following:
A kind of service life of battery of pure electric vehicle calculates and warning device, comprises battery management system BMS and central controller VMS; Wherein, battery management system BMS is used for monitoring in real time the numerical value of SOH, and VMS accepts the signal of the SOH of BMS transmission; And handle, obtain battery status.
Communicate connection through CAN between said battery management system BMS and the central controller VMS.
Also comprise instrument, the signal after said VMS will handle is sent to instrument, thereby shows and the prompting driver.
Be connected through the CAN communication between said VMS and the instrument, gauge internal can be carried out the A/D conversion after receiving signal.
The instrument panel of instrument shows battery status, and its progress bar under the good situation of SOH shows green light, reaches 80% o'clock progress bar exhibit red at SOH.
A kind of above-mentioned service life of battery of pure electric vehicle calculates and the control method of warning device, through the battery degree of depth charge and discharge cycles number of times prediction battery performance that adds up, again by life-span of the battery performance estimating battery that predicts.
For battery degree of depth charge and discharge cycles number of times is provided with a threshold values, reach this threshold values, then battery should be changed.
Before the life-span of confirming battery, at first confirm battery operated temperature range.
Definite method of said charge and discharge cycles number of times specifically adopts following steps:
(1) detects the variation of battery clean depth of discharge DOD of battery in the impulse discharge process in real time;
(2) changing value as clean depth of discharge DOD surpasses a calibration value, then shows discharge cycles of battery experience, and battery cycle index N adds up 1.0;
(3) when the changing value of clean depth of discharge DOD less than calibration value, it is constant that then cycle index N keeps initial value;
(4) obtain the cycle index N of battery after, according to the relation curve between battery actual capacity and the cycle index N, tabling look-up draws the real-time actual capacity Ca of battery;
(5) actual capacity Ca and rated capacity are divided by, and obtain the SOH value of battery.
Said SOH numerical range changes in 110%-0%, when the SOH value is 80%, shows that battery life arrives, needs to change battery.
If the model running cycle is T, T=20ms; It is 10% that calibration value is set, and the Ca rated capacity value that the present stage lithium battery is set is 40Ah.
Description of drawings
Fig. 1 is the block diagram of service life of battery of pure electric vehicle calculating and the realization of warning device system;
The process flow diagram that Fig. 2 realizes for battery cycle index in service life of battery of pure electric vehicle calculating and the warning device control method;
Among the figure:
1:battery (battery)
2：BMS/SOH
3，5：CAN
4：VMS
6：ISU
7:panel (instrument panel)
8:driver (driver)
Embodiment
Describe the present invention according to accompanying drawing below, it is a kind of preferred embodiment in the numerous embodiments of the present invention.
As shown in Figure 1, through the CAN line signal is delivered to VMS (central controller) behind the algorithm of the control SOH of BMS system through battery and carry out delivering to instrument panel through inner CAN again after the signal Processing and show.
As shown in Figure 2, the block diagram of the accumulation method of battery cycle index, soc are represented the battery charge amount, and Ca representes the actual capacity that battery is real-time.
Method in the present embodiment mainly also is the life-span of coming estimating battery through the method for prediction battery performance; The principle of prediction battery performance is through the battery degree of depth charge and discharge cycles number of times that adds up; But cycle index confirm to receive Influence of Temperature, need therefore to confirm earlier that battery operated temperature range confirms the life-span of battery again.
Because on PHEV; The electric weight of battery is because ongoing the discharging and recharging of variation meeting of operating mode; Therefore estimate that with the charge and discharge cycles number of times SOH is not a kind of good method; And the electric weight of each battery all is the process of charging-discharge-charging-discharge on pure electric automobile, and the variation of each electric weight all changes between 100% (idealizing)-20% (can demarcate), uses degree of depth charge and discharge cycles number of times to estimate a kind of good method of SOH value.
Monitor the numerical value of SOH in real time through BMS, send to VMS to numerical value through CAN, final VMS becomes sexadecimal number through inner CAN with data-switching, sending to instrument through the A/D conversion again, imagery be presented at the driver at the moment.
The model running cycle is T (T=20ms); The charge and discharge cycles number of times is confirmed as follows: detect the variation of battery clean DOD of battery (depth of discharge) in the impulse discharge process constantly; If the changing value of clean DOD (depth of discharge) surpasses 10% (can demarcate); Then show discharge cycles of battery experience, battery cycle index N adds up 1.0; If the changing value of clean DOD (depth of discharge) is less than 10% (can demarcate), it is constant that then cycle index N keeps initial value.After drawing the cycle index N of battery, according to the relation curve between battery actual capacity and the cycle index N, tabling look-up draws the real-time actual capacity Ca of battery; Be divided by with rated capacity (present stage the Ca ratings of lithium battery be 40Ah) again; Calculate the SOH value of battery, the SOH numerical range changes in 110%-0%, when the SOH value is 80%; Show that battery life arrives, need to change battery.
The working time t of upper layer software (applications) accumulative total battery, every warp be (tentative is 2h, and this value can be demarcated) after a while; Cycle index n adds 1; Working time resets then, restarts accumulative total, passes through 2h again; Add 1 again, this is to consider when the DOD changing value less than the generation of 5% situation counting the drift correction that inaccurate consideration is carried out.
Behind the numerical value that calculates N, can obtain the numerical value of Ca, calculate the numerical value of SOH then through formula S OH=Ca/ rated capacity through the mode of tabling look-up.
, handles VMS after accepting SOH signal that BMS transmits through CAN in controller master chip inside; Send to instrument through CAN again; Gauge internal can be carried out the A/D conversion, is presented at battery status above the instrument panel, and progress bar shows green light under the good situation of SOH; Progress bar becomes redness when SOH reaches 80%, reminds the driver should change battery this moment.
Combine accompanying drawing that the present invention has been carried out exemplary description above; Obviously the concrete realization of the present invention does not receive the restriction of aforesaid way; As long as the various improvement of having adopted method design of the present invention and technical scheme to carry out; Or directly apply to other occasion without improvement, all within protection scope of the present invention.
Claims (2)
1. a service life of battery of pure electric vehicle calculates and the control method of warning device, it is characterized in that, comprises; Battery management system BMS and central controller VMS; Wherein, battery management system BMS is used for monitoring in real time the numerical value of SOH, and VMS accepts the signal of the SOH of BMS transmission; And handle, obtain battery status;
Communicate connection through CAN between said battery management system BMS and the central controller VMS;
Said warning device also comprises instrument, and the signal after said VMS will handle is sent to instrument, thereby shows and the prompting driver;
Be connected through the CAN communication between said VMS and the instrument, gauge internal is carried out the A/D conversion after receiving signal;
The instrument panel of instrument shows battery status; Its progress bar under the good situation of SOH shows green light; Reach 80% o'clock progress bar exhibit red at SOH; Described battery life calculates and the control method of warning device is predicted battery performance through the battery degree of depth charge and discharge cycles number of times that adds up, and by the life-span of the battery performance estimating battery that predicts, specifically adopts following steps again:
(1) for battery degree of depth charge and discharge cycles number of times one threshold values is set, reaches this threshold values, then battery should be changed;
(2) before the life-span of confirming battery, at first confirm battery operated temperature range;
Wherein,
Definite method of said charge and discharge cycles number of times specifically adopts following steps:
(1) detects the variation of battery clean depth of discharge DOD of battery in the impulse discharge process in real time;
(2) changing value as clean depth of discharge DOD surpasses a calibration value, then shows discharge cycles of battery experience, and battery cycle index N adds up 1.0;
(3) when the changing value of clean depth of discharge DOD less than calibration value, it is constant that then cycle index N keeps initial value;
(4) obtain the cycle index N of battery after, according to the relation curve between battery actual capacity and the cycle index N, tabling look-up draws the real-time actual capacity Ca of battery;
(5) actual capacity Ca and rated capacity are divided by, and obtain the SOH value of battery.
2. service life of battery of pure electric vehicle calculates and the control method of warning device according to claim 1, it is characterized in that said SOH numerical range changes in 110%-0%, when SOH value is 80%, shows that battery life arrives, needs the replacing battery.
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| CN112757921B (en) * | 2020-12-24 | 2022-04-15 | 北京理工大学 | Automobile-used hybrid energy storage system based on lithium battery life prediction |
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| CN114347855A (en) * | 2022-03-18 | 2022-04-15 | 深圳摩吉智行科技有限公司 | Method and device for judging endurance mileage of electric two-wheeled vehicle based on SOC (System on chip) and SOH (sequence of events) |
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