CN102496747A - Thermal management device for power batteries and thermal management method for power batteries - Google Patents
Thermal management device for power batteries and thermal management method for power batteries Download PDFInfo
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Abstract
The invention discloses a thermal management device for power batteries and a thermal management method for the power batteries under abnormal working conditions. The thermal management device for the power batteries comprises an acquisition module, an evaluation module, a forecast module, a display module and a control module, wherein the forecast module is used for calculating the heat generation rate and the specific heat capacity according to temperature and temperature rise rate information obtained by the acquisition module and the evaluation module and information such as types, operating states, states of charge and the like of the power batteries so as to obtain forecasted temperature field distribution of a battery unit, and the display module is used for displaying the temperature field distribution of the battery unit forecasted by the forecast module and a current alarm status of the battery unit to a user. The thermal management method for the power batteries is capable of forecasting the temperature field distribution of the battery unit according to acquired temperature and temperature rise data, and at least one of control measures such as turn-off, heat dissipation, alarm and the like is effectively taken, so that the danger of an automobile due to the power batteries can be reduced under the abnormal working conditions.
Description
Technical field
The present invention relates to a kind of the electric automobile power battery thermal stability carried out management devices and method.The heat management device and the method for electrokinetic cell under the improper operating modes such as accident or the experience extreme weather of meeting accident in particular to electric automobile.
Background technology
Because global petroleum resources continue continuous deterioration in short supply and weather environment; The development and utilization of new forms of energy has received the generally attention of countries in the world; And as the automobile industry of consuming whole world total energy 10%; The research and development of electric automobile be considered to solve at present the reality of energy crisis and environmental protection, valid approach, and the core technology of electric automobile development is exactly an electrokinetic cell.But electrokinetic cell is under situation such as high temperature, vibration or extruding, and violent reaction can take place inside battery, produces a large amount of heat, and in the inside battery accumulation, battery may burn or explode if heat has little time to scatter and disappear.For reliable, safe use battery; Particularly be reduced in electric automobile meet accident accident or (the improper operating mode of electric automobile power battery when meeting with extreme weather; Common improper operating mode mainly comprises: vehicle collision, knock into the back, overturn, paddle, heavy rain, be exposed to the sun; And the overcharging of battery, cross misoperation situation such as put), the potential hazard relevant with battery will in time, correctly be estimated the thermal stability of battery.Therefore, design to the electrokinetic cell heat management module under the improper operating mode of electric automobile, monitoring, assessment, the early warning of the battery pack that realizes a plurality of cell is formed, and take corresponding safety measure.
But it all is to be basis for estimation with temperature or temperature rise rate that existing battery thermal management module realizes the heating of battery pack or refrigeration, when battery pack temperature or temperature rise rate are higher than a certain respective value, begins battery pack is cooled off.Mostly be life-span or the capacity of battery, state-of-charge, the dump energy of prediction battery etc. to the forecasting research of battery; The variation tendency of battery thermal stability is not predicted accordingly; Make existing battery management system have certain potential safety hazard, can't be timely or prospectively take the corresponding feedback measure.
Therefore; For guaranteeing the safe operation of electrokinetic cell; The potential hazard relevant when particularly reducing the improper operating mode of electric automobile with the battery thermal stability; The battery thermal management apparatus and method under a kind of safer improper operating mode of electric automobile be must set up, thereby monitoring, assessment, control and prediction realized cell, battery module and battery pack.
Summary of the invention
For reducing under the improper operating mode of electric automobile because the personnel that the battery thermal stability causes injury, equipment loss and economic loss; The present invention proposes the battery thermal management method and apparatus under the improper operating mode of a kind of electric automobile; Solved and only adopted temperature and temperature rise rate to be worth as a reference in the prior art, only relied on real-time monitor data to take control measure and the potential safety hazard that possibly exist.
A kind of electrokinetic cell heat management device comprises:
Acquisition module is used to gather temperature and temperature rise rate with the counting cell unit; Wherein, The temperature of each battery module that the temperature of said battery unit and temperature rise rate comprise each cell, be made up of a plurality of said cell and the battery pack formed by a plurality of said battery module; The temperature rise rate of each said cell, each said battery module and said battery pack, and maximum temperature and maximum temperaturerise speed, the mean temperature of each battery module and the mean temperature of said battery pack in each battery cell that calculates by the temperature value that collects;
Evaluation module; Temperature, temperature rise rate and average temperature value and predefined corresponding each heat radiation threshold value of being used for institute is gathered and calculates compare; And judge whether any one in the mean temperature peace samming raising speed rate of maximum temperature and the highest temperature rise rate in each cell, the mean temperature peace samming raising speed rate of each battery module, said battery pack surpass its corresponding separately each heat radiation threshold value, and said each heat radiation comprises by the threshold value height successively turn-offs threshold value, secondary heat radiation threshold value and one-level heat radiation threshold value;
It is characterized in that, also comprise,
Prediction module, heat generation rate and specific heat capacity that the information that is used for obtaining according to acquisition module and evaluation module and material type, operating state, the state-of-charge of battery come counting cell, and then the temperature field that obtains the battery unit of prediction distributes:
Display module, the information of demonstration comprise that at least the temperature field of the said battery unit of said prediction module prediction distributes and the alarm status of current battery unit;
Control module, the temperature field that comparative result that is used for obtaining according to said evaluation module and said prediction module predict distribute and take corresponding control measures, said control measure to comprise in heat radiation, shutoff and the alarm measure one or more.
Wherein, said cooling measure comprises at least a in air-cooled, two kinds of cooling measures of liquid cooling.
Wherein, said cooling measure carries out said one-level and/or secondary heat radiation through controlling flow air-cooled and/or the liquid cooling heat radiation.
Wherein, said shutoff threshold value is an A level control hierarchy, as long as any one judges that parameter surpasses and turn-offs threshold value, no matter whether other parameters are normal, or/whether be in the one-level radiating state, or/whether be in the secondary radiating state, all take the turn-off circuit measure; Said secondary heat radiation threshold value is a B level control hierarchy, as long as any one judges that parameter surpasses secondary heat radiation threshold value, no matter whether other parameters are normal, or/whether be in the one-level radiating state, all take the secondary cooling measure; Said one-level heat radiation threshold value is a C level control hierarchy, judges that parameter surpasses one-level heat radiation threshold value, takes the one-level cooling measure.
A kind of electrokinetic cell thermal management algorithm comprises,
It is characterized in that, also comprise,
Step 4, the temperature field that utilizes display module to incite somebody to action the said battery unit of said at least prediction module prediction distribute and the alarm status of current battery unit shows.
The temperature field that step 5, the comparative result that said evaluation module is obtained and said prediction module predict distributes and utilizes control module to take corresponding control measures, and said control measure comprise one or more in heat radiation, shutoff and the alarm measure;
Wherein, said cooling measure comprises at least a in air-cooled, two kinds of cooling measures of liquid cooling.
Wherein, said cooling measure carries out said one-level and/or secondary heat radiation through controlling flow air-cooled and/or the liquid cooling heat radiation.
Wherein, said shutoff threshold value is an A level control hierarchy, as long as any one judges that parameter surpasses and turn-offs threshold value, no matter whether other parameters are normal, or/whether be in the one-level radiating state, or/whether be in the secondary radiating state, all take the turn-off circuit measure; Said secondary heat radiation threshold value is a B level control hierarchy, as long as any one judges that parameter surpasses secondary heat radiation threshold value, no matter whether other parameters are normal, or/whether be in the one-level radiating state, all take the secondary cooling measure; Said one-level heat radiation threshold value is a C level control hierarchy, judges that parameter surpasses one-level heat radiation threshold value, takes the one-level cooling measure.
Battery thermal management apparatus and method of the present invention have the following advantages:
The present invention proposes a kind of battery thermal management apparatus and method; Temperature field according to prediction distributes to instruct battery unit is carried out control measure; And the temperature field distributed intelligence of real-time temperature field distributed intelligence and prediction is shown to the user; Thereby having reduced existing battery thermal management apparatus and method is the potential safety hazard that basis for estimation exists with the real time data of temperature or temperature rise rate only, and then is convenient to take prospective corresponding control measure.
Description of drawings
Fig. 1 is the structural representation of the electrokinetic cell heat management device under the improper operating mode of the present invention.
Fig. 2 is the electrokinetic cell thermal management algorithm flow chart under the improper operating mode of the present invention.
Embodiment
Below in conjunction with accompanying drawing of the present invention technical scheme among the present invention is carried out clear, complete description.
Shown in Figure 1 is electrokinetic cell heat management device block diagram of the present invention, wherein,
1 is acquisition module, is used to gather temperature and temperature rise rate with the counting cell unit; Wherein, The temperature of each battery module that the temperature of said battery unit and temperature rise rate comprise each cell, be made up of a plurality of said cell and the battery pack formed by a plurality of said battery module; The temperature rise rate of each said cell, each said battery module and said battery pack, and maximum temperature and maximum temperaturerise speed, the mean temperature of each battery module and the mean temperature of said battery pack in each battery cell that calculates by the temperature value that collects.
2 is evaluation module; Temperature, temperature rise rate and average temperature value and predefined corresponding each heat radiation threshold value of being used for institute is gathered and calculates compare; And judge whether any one in the mean temperature peace samming raising speed rate of maximum temperature and the highest temperature rise rate in each cell, the mean temperature peace samming raising speed rate of each battery module, said battery pack surpass its corresponding separately each heat radiation threshold value, and said each heat radiation comprises by the threshold value height successively turn-offs threshold value, secondary heat radiation threshold value and one-level heat radiation threshold value.
3 is prediction module; Heat generation rate and specific heat capacity that the information that it is used for being obtained according to acquisition module 1 and evaluation module 2 and material type, operating state, the state-of-charge of battery come counting cell; And then the temperature field that obtains the battery unit of prediction distributes, specifically can for:
1) mean temperature of real-time monitoring battery group peace samming raising speed rate; As judge that parameter surpasses level heat radiation threshold value; Be that heat management system has started one-level cooling measure or secondary cooling measure; The mean temperature of prediction module opening entry battery pack peace samming raising speed rate then, and use the mean temperature peace samming raising speed rate of fuzzy neural network prediction battery pack according to data recorded;
2) according to the temperature of predicting; And cell types, the operating state (charge/discharge) of battery, the state-of-charge of battery; The heat generation rate of Application of B ernardi heat generation rate model estimating battery, and estimate the specific heat capacity of battery through thermal capacitance weighted average to battery constituent material;
3) application of finite element software is set up the thermal effect model of battery, and the temperature field that estimates battery according to battery heat generation rate and the specific heat capacity of prediction;
4) temperature field through the prediction battery pack and with the comparison of the mean temperature of the battery pack that obtains in real time; Take following measure: be lower than 3 ℃ of predicted temperature fields or more like mean temperature; Prediction module is not taken measures, otherwise prediction module feeds back to the battery management center through control module, sends alarm signal; Trigger starting switch output like alarm signals such as display screen caution demonstration, warning lamp, loudspeakers; To reach alerting drivers or passenger's purpose, in case of necessity, the driver is the current control measure of upgrading by hand;
5) monitor the maximum temperature of cell, the highest temperature rise rate, mean temperature, average temperature rising speed, the mean temperature peaceful samming raising speed rate of battery pack and the relation of corresponding one-level heat radiation threshold value, secondary heat radiation threshold value or shutoff threshold value of battery module in real time; As when judging parameter less than corresponding threshold value; Feed back to the battery management center through control module, reply the operating state of battery pack step by step.
4 is display module, and the information of demonstration comprises that at least the temperature field of the said battery unit of said prediction module prediction distributes and the alarm status of current battery unit.Can also comprise manual input part on this display module, be used to supply the user in the scope of system's regulation, to select one-level heat radiation threshold value, secondary heat radiation threshold value or shutoff heat radiation threshold value.
5 is control module, and the temperature field that comparative result that is used for obtaining according to said evaluation module 2 and said prediction module 3 predict distributes and takes corresponding control measures, said control measure to comprise in heat radiation, shutoff and the alarm measure one or more.Specifically can be:
The result who obtains according to evaluation module and the control hierarchy of threshold value are taked corresponding control measures; Any one of mean temperature peace samming raising speed rate like the mean temperature of the maximum temperature of cell, the highest temperature rise rate, battery module, average temperature rising speed, battery pack judges that parameter surpasses corresponding one-level heat radiation threshold value, secondary heat radiation threshold value or turn-offs threshold value, takes measures such as corresponding wind-cooling heat dissipating, liquid heat radiation and/or turn-off circuit respectively;
One-level heat radiation: adopt the blower fan that is assembled in internal system, utilize air that battery is cooled off (or ventilation), to reach battery pack heat radiation purpose through parallel mode of ventilating.
Secondary heat radiation: arrange pipeline at intermodule, or, adopt water, ethylene glycol or cold-producing medium, to reach battery pack heat radiation purpose as heat transfer medium around the module arrangement chuck.
Turn-off: after control module receives cut-off signals, trigger turn-off circuits such as startup is opened the light, relay, to reach the purpose that reduces the potential burning of battery, explosion hazard.
In accompanying drawing 1; 3A for the comparative result that obtains according to evaluation module 2 the control measure that will carry out; 3B is the control measure that institute will carry out that distribute of the temperature field based on prediction, control module 3 through relatively control measure 3A and 3B grade other just select the control measure of higher level or select two kinds of control measure all to adopt.
Be the step a1-a5 flow chart of electrokinetic cell thermal management algorithm of the present invention shown in the accompanying drawing 2.Wherein, be specially:
Step a1, to the real-time multi-point temp acquisition module of cell, obtain the maximum temperature and the highest temperature rise rate of each cell; The mean temperature peace samming raising speed rate of counting cell module and battery pack;
Step a2, utilize evaluation module that institute's temperature of gathering and calculating and temperature rise rate and predefined corresponding each threshold value of dispelling the heat is compared; And judge whether any one in the mean temperature peace samming raising speed rate of maximum temperature and the highest temperature rise rate in each cell, the mean temperature peace samming raising speed rate of each battery module, said battery pack surpass its corresponding separately each heat radiation threshold value, and said each heat radiation comprises by the threshold value height successively turn-offs threshold value, secondary heat radiation threshold value and one-level heat radiation threshold value:
Wherein, turn-offing threshold value is A level control hierarchy, as long as any one judges that parameter surpasses and turn-offs threshold value, no matter whether other parameters are normal, or/whether be in the one-level radiating state, or/whether be in the secondary radiating state, all take the turn-off circuit measure; Secondary heat radiation threshold value is a B level control hierarchy, as long as any one judges that parameter surpasses secondary heat radiation threshold value, no matter whether other parameters are normal, or/whether be in the one-level radiating state, all take the secondary cooling measure; One-level heat radiation threshold value is a C level control hierarchy, judges that parameter surpasses one-level heat radiation threshold value, takes the one-level cooling measure.Improve the reliability and the fail safe of battery thermal management system through this kind control hierarchy.
Wherein, Temperature and temperature rise rate value when turn-offing threshold value and be battery phenomenon such as thermal runaway possibly take place; Each turn-offs threshold value greater than corresponding secondary heat radiation threshold value; Be the secondary heat radiation threshold value of the shutoff threshold value of battery cell maximum temperature greater than the battery cell maximum temperature; The shutoff threshold value of battery module mean temperature is greater than the secondary heat radiation threshold value of battery cell maximum temperaturerise speed, and the shutoff threshold value of battery module mean temperature is greater than the secondary heat radiation threshold value of battery module mean temperature, and the shutoff threshold value of battery module average temperature rising speed is greater than the secondary heat radiation threshold value of battery module average temperature rising speed; The shutoff threshold value of battery pack mean temperature is greater than the secondary heat radiation threshold value of battery pack mean temperature, and the shutoff threshold value of battery pack average temperature rising speed is greater than the secondary heat radiation threshold value of battery pack average temperature rising speed.Each secondary heat radiation threshold value is greater than corresponding one-level heat radiation threshold value; Be the one-level heat radiation threshold value of the secondary heat radiation threshold value of battery cell maximum temperature greater than the battery cell maximum temperature; The secondary heat radiation threshold value of battery module mean temperature is greater than the one-level heat radiation threshold value of battery cell maximum temperaturerise speed; The secondary heat radiation threshold value of battery module mean temperature is greater than the one-level heat radiation threshold value of battery module mean temperature; The secondary heat radiation threshold value of battery module average temperature rising speed is greater than the one-level heat radiation threshold value of battery module average temperature rising speed; The secondary heat radiation threshold value of battery pack mean temperature is greater than the one-level heat radiation threshold value of battery pack mean temperature, and the secondary heat radiation threshold value of battery pack average temperature rising speed is greater than the one-level heat radiation threshold value of battery pack average temperature rising speed.
Preferably; When in the average temperature rising speed of the mean temperature of the average temperature rising speed of the mean temperature of the maximum temperaturerise speed of the maximum temperature of battery cell, battery cell, battery module, battery module, battery pack and battery pack any one when being higher than corresponding one-level heat radiation threshold value (being respectively the one-level heat radiation threshold value of battery cell maximum temperature, the one-level heat radiation threshold value of battery cell maximum temperaturerise speed, the one-level heat radiation threshold value of battery module mean temperature, the one-level heat radiation threshold value of battery module average temperature rising speed, the one-level heat radiation threshold value of battery pack mean temperature and the one-level heat radiation threshold value of battery pack average temperature rising speed) carries out wind-cooling heat dissipating to battery pack.
Preferably; When in the average temperature rising speed of the mean temperature of the average temperature rising speed of the mean temperature of the maximum temperaturerise speed of the maximum temperature of battery cell, battery cell, battery module, battery module, battery pack and battery pack any one when being higher than corresponding secondary heat radiation threshold value (being respectively the secondary heat radiation threshold value of battery cell maximum temperature, the secondary heat radiation threshold value of battery cell maximum temperaturerise speed, the secondary heat radiation threshold value of battery module mean temperature, the secondary heat radiation threshold value of battery module average temperature rising speed, the secondary heat radiation threshold value of battery pack mean temperature and the secondary heat radiation threshold value of battery pack average temperature rising speed) carries out the liquid heat radiation to battery pack.
Preferably, adopt means of ventilation in time to discharge the potential pernicious gas that produces in the battery.
Step a3, the temperature field through prediction module prediction battery pack, and compare with the mean temperature of the battery pack that obtains in real time, be lower than 3 ℃ of predicted temperature fields or more like mean temperature; Prediction module is not taken measures; Otherwise prediction module feeds back to the battery management center through control module, sends alarm signal, reminds driver or passenger; In case of necessity, driver's current control measure of can upgrading by hand; Simultaneously in real time the mean temperature peace samming raising speed rate of the mean temperature of the maximum temperature of monitoring cell, the highest temperature rise rate, battery module, average temperature rising speed, battery pack and corresponding one-level heat radiation threshold value, secondary heat radiation threshold value or turn-off the relation of threshold value; As when judging parameter less than corresponding threshold value; Feed back to the battery management center through control module, reply the operating state of battery pack step by step.
1) mean temperature of the real-time monitoring battery group of prediction module peace samming raising speed rate; As judge that parameter surpasses level heat radiation threshold value; Be that heat management system has started one-level cooling measure or secondary cooling measure; The mean temperature of prediction module opening entry battery pack peace samming raising speed rate then, and use the mean temperature peace samming raising speed rate of fuzzy neural network prediction battery pack according to data recorded;
2) according to the temperature of predicting; And cell types, the operating state (charge/discharge) of battery, the state-of-charge of battery; The heat generation rate of Application of B ernardi heat generation rate model estimating battery, and estimate the specific heat capacity of battery through thermal capacitance weighted average to battery constituent material;
3) application of finite element software is set up the thermal effect model of battery, and the temperature field that estimates battery according to battery heat generation rate and the specific heat capacity of prediction;
4) temperature field through the prediction battery pack and with the comparison of the mean temperature of the battery pack that obtains in real time; Take following measure: be lower than 3 ℃ of predicted temperature fields or more like mean temperature, prediction module is not taken measures, otherwise prediction module feeds back to the battery management center through control module; Send alarm signal; Remind driver or passenger, in case of necessity, driver's current control measure of can upgrading by hand;
5) monitor in real time the maximum temperature of cell, the highest temperature rise rate, battery module mean temperature, average temperature rising speed, battery pack the corresponding one-level heat radiation of mean temperature peace samming raising speed rate threshold value, secondary heat radiation threshold value or turn-off the relation of threshold value; As when judging parameter less than corresponding threshold value; Feed back to the battery management center through control module, reply the operating state of battery pack step by step.
Step a4, show that through display module 4 temperature field of the said battery unit that comprises said prediction module prediction at least distributes and the alarm status of current battery unit.Can also comprise manual input part on this display module, be used to supply the user in the scope of system's regulation, to select one-level heat radiation threshold value, secondary heat radiation threshold value or shutoff heat radiation threshold value.This display module further can also show the battery temperature field distribution data of gathering and evaluation module obtains.
Step a5,3A for the comparative result that obtains according to evaluation module 2 the control measure that will carry out; 3B is the control measure that institute will carry out that distribute of the temperature field based on prediction, control module 3 through relatively control measure 3A and 3B grade other just select the control measure of higher level or select two kinds of control measure all to adopt.
Heat management module functions under the improper operating mode comprises: the temperature and the temperature rise rate that 1, detect each battery; 2, through using air, liquid directly or indirectly to contact initiatively or passive cool batteries with battery; 3, through ventilating, in time discharge the potential pernicious gas that battery produces; 4, through reporting to the police and/or cut-off loop elimination and the potential danger of control battery; 5, the corresponding subsequent responsive measures is taked in battery temperature field through comparison prediction and the battery temperature data of gathering in real time, thus the danger relevant when reducing the improper operating mode of electric automobile with the battery thermal stability.
Heat management module monitors electric automobile under the improper operating mode has an accident or temperature and temperature rise rate thereof when meeting with extreme weather; When the battery context temperature is too high, realize the battery context temperature controlling through the flow of control cooling air flow or cooling liquid; When the battery temperature rise rate surpasses corresponding threshold value, feed back to battery management center, turn-off circuit through control module; Predict the temperature of battery and the variation tendency of temperature rise rate simultaneously.
Embodiment 1: the thermal management algorithm that the power battery module of being made up of the cell of 11Ah under the improper operating mode is taked.Given embodiment has asked explanation technical scheme of the present invention, rather than in order to limit protection content of the present invention.
Battery pack contains 20 battery modules; Each battery module is in series by 6 cells, and wherein the nominal voltage of cell is 3.7V, and nominal capacity is 11Ah; Cell is formed: positive electrode active materials is LiMn2O4; Negative active core-shell material is a graphite, and the main component of electrolyte is LiPF6, EC (ethylene carbonate) and DMC (dimethyl carbonate), and celgard 2325 barrier films etc.
In explosion-proof tank (model H-FZ-500), battery module has been carried out bump test, the temperature of gathering each cell with data acquisition unit (model FLUKE 2620).
In certain bump test process, the maximum temperature of each cell and maximum temperaturerise speed data, and the mean temperature of battery module peace samming raising speed rate, as shown in table 1.
Table 1 temperature and temperature rise rate data
One-level heat radiation threshold value, secondary heat radiation threshold value and shutoff threshold value that this battery is provided with are as shown in table 2.
The threshold value that table 2 is provided with
Through the control module in the battery thermal management of the present invention's proposition; The maximum temperature that can obtain cell surpasses secondary heat radiation threshold value; The highest temperature rise rate of cell is less than the one-level threshold value of dispelling the heat, and the mean temperature of battery module surpasses one-level heat radiation threshold value, and the average temperature rising speed of battery module is less than the one-level threshold value of dispelling the heat; So battery thermal management system is taked the secondary heat radiation to battery, promptly battery is carried out the liquid heat radiation.
Through the prediction module in the battery thermal management of the present invention's proposition; Can obtain through behind the 156s; The maximum temperature of cell (34.62 ℃) is lower than its corresponding secondary heat radiation threshold value (35 ℃) but still is higher than its corresponding one-level heat radiation threshold value (30 ℃), feeds back to the battery management center through control module, the closing liquid cooling measure; Open the one-level cooling measure, promptly battery is carried out the air heat radiation.Through behind the 456s, the maximum temperature of cell (29.83 ℃) is lower than its corresponding one-level heat radiation threshold value (30 ℃), feeds back to the battery management center through control module, closes the one-level cooling measure, replys the normal operating conditions of battery pack.
The present invention proposes the battery thermal management method of a kind of electric automobile power battery under improper operating mode; And set up the battery thermal management device based on the method; Temperature through each cell of gathering; Obtain mean temperature, the average temperature rising speed of the maximum temperature of cell, the highest temperature rise rate, battery module, the mean temperature peace samming raising speed rate of battery pack; Pass through one-level heat radiation threshold value, the secondary heat radiation threshold value of control module and setting again and turn-off threshold, and take control measure such as corresponding cooling, early warning or loop circuit, pass, the while is according to the temperature field of prediction module prediction and the comparative analysis of the temperature of collection in real time; Electrokinetic cell is taked to report to the police or is recovered follow-up such as operate as normal, thus reduce automobile under improper operating mode because the danger that battery produced.
Though described execution mode of the present invention above in detail, under the situation that does not depart from spirit of the present invention or inner characteristic, the present invention can also embody with other form.Therefore, above description only is in order to explain, rather than in order to limit.Protection scope of the present invention should be limited the above description in accompanying claims rather than the specification.All equivalence transformations in the claim implication all should fall within protection scope of the present invention.
Claims (8)
1. electrokinetic cell heat management device comprises:
Acquisition module is used to gather temperature and temperature rise rate with the counting cell unit; Wherein, The temperature of each battery module that the temperature of said battery unit and temperature rise rate comprise each cell, be made up of a plurality of said cell and the battery pack formed by a plurality of said battery module; The temperature rise rate of each said cell, each said battery module and said battery pack, and maximum temperature and maximum temperaturerise speed, the mean temperature of each battery module and the mean temperature of said battery pack in each battery cell that calculates by the temperature value that collects;
Evaluation module; Temperature, temperature rise rate and average temperature value and predefined corresponding each heat radiation threshold value of being used for institute is gathered and calculates compare; And judge whether any one in the mean temperature peace samming raising speed rate of maximum temperature and the highest temperature rise rate in each cell, the mean temperature peace samming raising speed rate of each battery module, said battery pack surpass its corresponding separately each heat radiation threshold value, and said each heat radiation threshold value comprises by height successively turn-offs threshold value, secondary heat radiation threshold value and one-level heat radiation threshold value;
It is characterized in that, also comprise,
Prediction module, heat generation rate and specific heat capacity that the information that is used for obtaining according to acquisition module and evaluation module and material type, operating state, the state-of-charge of battery come counting cell, and then the temperature field that obtains the battery unit of prediction distributes;
Display module, the information of demonstration comprise that at least the temperature field of the said battery unit of said prediction module prediction distributes and the alarm status of current battery unit;
Control module, the temperature field that comparative result that is used for obtaining according to said evaluation module and said prediction module predict distribute and take corresponding control measures, said control measure to comprise in heat radiation, shutoff and the alarm measure one or more.
2. electrokinetic cell heat management device according to claim 1 is characterized in that, that said cooling measure comprises is air-cooled, at least a in two kinds of cooling measures of liquid cooling.
3. electrokinetic cell heat management device according to claim 2 is characterized in that, said cooling measure carries out said one-level and/or secondary heat radiation through controlling flow air-cooled and/or the liquid cooling heat radiation.
4. according to each described electrokinetic cell heat management device among the claim 1-3; It is characterized in that said shutoff threshold value is an A level control hierarchy, as long as any one judges that parameter surpasses the shutoff threshold value; No matter whether other parameter is normal; Or/whether be in the one-level radiating state, or/whether be in the secondary radiating state, all take the turn-off circuit measure; Said secondary heat radiation threshold value is a B level control hierarchy, as long as any one judges that parameter surpasses secondary heat radiation threshold value, no matter whether other parameter is normal, or/whether be in the one-level radiating state, all take the secondary cooling measure; Said one-level heat radiation threshold value is a C level control hierarchy, judges that parameter surpasses one-level heat radiation threshold value, takes the one-level cooling measure.
5. an electrokinetic cell thermal management algorithm comprises,
Step 1, utilize the temperature and the temperature rise rate of acquisition module collection and counting cell unit; Wherein, The temperature of each battery module that the temperature of said battery unit and temperature rise rate comprise each cell, be made up of a plurality of said cell and the battery pack formed by a plurality of said battery module; The temperature rise rate of each said cell, each said battery module and said battery pack, and maximum temperature and maximum temperaturerise speed, the mean temperature of each battery module and the mean temperature of said battery pack in each battery cell that calculates by the temperature value that collects;
Step 2, utilize evaluation module that institute's temperature of gathering and calculating and temperature rise rate and predefined corresponding each threshold value of dispelling the heat is compared; And judge whether any one in the mean temperature peace samming raising speed rate of maximum temperature and the highest temperature rise rate in each cell, the mean temperature peace samming raising speed rate of each battery module, said battery pack surpass its corresponding separately each heat radiation threshold value, and said each heat radiation comprises by the threshold value height successively turn-offs threshold value, secondary heat radiation threshold value and one-level heat radiation threshold value;
It is characterized in that, also comprise,
Step 3, heat generation rate and the specific heat capacity of utilizing prediction module to come counting cell according to material type, operating state, the state-of-charge of information that acquisition module and evaluation module obtained and battery, and then the temperature field that obtains the battery unit of prediction distributes;
Step 4, the temperature field that utilizes display module to incite somebody to action the said battery unit of said at least prediction module prediction distribute and the alarm status of current battery unit shows;
The temperature field that step 5, the comparative result that obtains to said evaluation module and said prediction module predict distributes and utilizes control module to take corresponding control measures, and said control measure comprise one or more in heat radiation, shutoff and the alarm measure.
6. that electrokinetic cell thermal management algorithm according to claim 5, said cooling measure comprise is air-cooled, at least a in two kinds of cooling measures of liquid cooling.
7. according to claim 5 or 6 described electrokinetic cell electric heating management devices, it is characterized in that said cooling measure carries out said one-level and/or secondary heat radiation through controlling flow air-cooled and/or the liquid cooling heat radiation.
8. according to claim 5 or 6 described electrokinetic cell thermal management algorithms; Said shutoff threshold value is an A level control hierarchy; As long as any one judges that parameter surpasses and turn-offs threshold value, no matter whether other parameter is normal, or/whether be in the one-level radiating state; Or/whether be in the secondary radiating state, all take the turn-off circuit measure; Said secondary heat radiation threshold value is a B level control hierarchy, as long as any one judges that parameter surpasses secondary heat radiation threshold value, no matter whether other parameter is normal, or/whether be in the one-level radiating state, all take the secondary cooling measure; Said one-level heat radiation threshold value is a C level control hierarchy, judges that parameter surpasses one-level heat radiation threshold value, takes the one-level cooling measure.
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