CN102496747B - 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 one electric automobile power battery thermal stability is managed to apparatus and method.Heat management device and the method for electrokinetic cell under the damages 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 been subject to 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 most real, the most effective approach of energy crisis and environmental protection, and the core technology of Development of Electric Vehicles is exactly electrokinetic cell.But electrokinetic cell is in the situations such as high temperature, vibration or extruding, and violent reaction can occur inside battery, produces a large amount of heat, if heat has little time to scatter and disappear, in inside battery accumulation, battery may burn or explode.For reliable, safe use battery, particularly be reduced in meet accident accident the or meet with (damage of electric automobile power battery during extreme weather of electric automobile, common damage mainly comprises: vehicle collision, knock into the back, overturn, paddle, heavy rain, be exposed to the sun, and the misoperation situations such as overcharging, excessively put of battery), the potential hazard relevant with battery, in time, correctly evaluate the thermal stability of battery.Therefore, design for the electrokinetic cell heat management module under electric automobile damage, realize monitoring, assessment, the early warning of the battery pack that multiple cells are formed, and take corresponding safety measure.
But it is all take temperature or temperature rise rate as basis for estimation that existing battery thermal management module realizes heating to battery pack or refrigeration, when battery pack temperature or temperature rise rate are during higher than a certain respective value, start battery pack to carry out cooling.For the forecasting research of battery, mostly be the prediction life-span of battery or the capacity of battery, state-of-charge, dump energy etc., the variation tendency of battery thermal stability is not predicted accordingly, make existing battery management system have certain potential safety hazard, cannot be timely or prospectively take the measure of feeding back accordingly.
Therefore, for guaranteeing the safe operation of electrokinetic cell, the potential hazard relevant with battery thermal stability while particularly reducing electric automobile damage, thermal management device of battery and method under a kind of safer electric automobile damage be must set up, thereby monitoring, assessment, control and prediction to cell, battery module and battery pack realized.
Summary of the invention
For reducing the personnel's injury, equipment loss and the economic loss that cause due to battery thermal stability under electric automobile damage, the present invention proposes the battery thermal management method and apparatus under a kind of electric automobile damage, solved and in prior art, only adopted temperature and temperature rise rate as with reference to value, only relied on real-time monitor data to take control measure and the potential safety hazard that may exist.
A kind of heat management device of power battery, comprising:
Acquisition module, for gathering and calculate temperature and the temperature rise rate of battery unit; Wherein, the temperature of each battery module that the temperature of described battery unit and temperature rise rate comprise each cell, be comprised of multiple described cells and the battery pack being formed by multiple described battery modules, cell described in each, the temperature rise rate of battery module and described battery pack described in each, and the maximum temperature in each battery cell being calculated by the temperature value collecting and maximum temperaturerise speed, the mean temperature of each battery module and the mean temperature of described battery pack;
Evaluation module, for by the temperature, temperature rise rate and the average temperature value that gather and calculate and predefined corresponding each threshold value of dispelling the heat compare, and the mean temperature peace that judges maximum temperature in each cell and the highest temperature rise rate, each battery module all temperature rise rate, described battery pack mean temperature peace all any one in temperature rise rate whether exceed its corresponding each heat radiation threshold value separately, described each heat radiation comprises successively and turn-offs threshold value, two-class heat dissipation threshold value and one-level heat radiation threshold value by threshold value height;
It is characterized in that, also comprise,
Prediction module, calculates heat generation rate and the specific heat capacity of battery for the information that obtains according to acquisition module and evaluation module and material type, operating state, the state-of-charge of battery, and then the temperature field that obtains the battery unit of prediction distributes:
Display module, the information of demonstration at least comprises that the temperature field of the described battery unit of described prediction module prediction distributes and the alarm status of current battery unit;
Control module, the temperature field predicting for the comparative result that obtains according to described evaluation module and described prediction module distributes and takes corresponding control measure, described control measure to comprise one or more in heat radiation, shutoff and alarm measure.
Wherein, described cooling measure comprises at least one in air-cooled, two kinds of cooling measures of liquid cooling.
Wherein, described cooling measure carries out described one-level and/or two-class heat dissipation by the flow of controlling air-cooled and/or liquid-cooling heat radiation.
Wherein, described shutoff threshold value is A level control hierarchy, as long as any one judges that parameter exceedes shutoff threshold value, no matter whether other parameters are normal, or/whether in one-level radiating state, or/whether in two-class heat dissipation state, all take turn-off circuit measure; Described two-class heat dissipation threshold value is B level control hierarchy, as long as any one judges that parameter exceedes two-class heat dissipation threshold value, no matter whether other parameters are normal, or/whether in one-level radiating state, all take two-class heat dissipation measure; Described one-level heat radiation threshold value is C level control hierarchy, judges that parameter exceedes one-level heat radiation threshold value, takes one-level cooling measure.
A kind of power battery thermal management method, comprises,
It is characterized in that, also comprise,
Step 4, utilize display module that the temperature field of the described battery unit of at least described prediction module prediction is distributed and the alarm status of current battery unit shows.
The temperature field that step 5, the comparative result that described evaluation module is obtained and described prediction module predict distributes and utilizes control module to take corresponding control measure, and described control measure comprise one or more in heat radiation, shutoff and alarm measure;
Wherein, described cooling measure comprises at least one in air-cooled, two kinds of cooling measures of liquid cooling.
Wherein, described cooling measure carries out described one-level and/or two-class heat dissipation by the flow of controlling air-cooled and/or liquid-cooling heat radiation.
Wherein, described shutoff threshold value is A level control hierarchy, as long as any one judges that parameter exceedes shutoff threshold value, no matter whether other parameters are normal, or/whether in one-level radiating state, or/whether in two-class heat dissipation state, all take turn-off circuit measure; Described two-class heat dissipation threshold value is B level control hierarchy, as long as any one judges that parameter exceedes two-class heat dissipation threshold value, no matter whether other parameters are normal, or/whether in one-level radiating state, all take two-class heat dissipation measure; Described one-level heat radiation threshold value is C level control hierarchy, judges that parameter exceedes one-level heat radiation threshold value, takes one-level cooling measure.
Thermal management device of battery of the present invention and method, have the following advantages:
The present invention proposes a kind of thermal management device of battery and method, according to the temperature field of prediction, distribute to instruct battery unit is carried out to control measure, and the temperature field distributed intelligence of real-time temperature field distributed intelligence and prediction is shown to user, thereby reduced the potential safety hazard that existing thermal management device of battery and method only exist as basis for estimation take the real time data of temperature or temperature rise rate, and then be convenient to take prospective corresponding control measure.
Accompanying drawing explanation
Fig. 1 is the structural representation of the heat management device of power battery under damage of the present invention.
Fig. 2 is the power battery thermal management method flow chart under damage of the present invention.
Embodiment
Below in conjunction with accompanying drawing of the present invention, technical scheme in the present invention is carried out to clear, complete description.
Figure 1 shows that heat management device of power battery block diagram of the present invention, wherein,
1 is acquisition module, for gathering and calculate temperature and the temperature rise rate of battery unit; Wherein, the temperature of each battery module that the temperature of described battery unit and temperature rise rate comprise each cell, be comprised of multiple described cells and the battery pack being formed by multiple described battery modules, cell described in each, the temperature rise rate of battery module and described battery pack described in each, and the maximum temperature in each battery cell being calculated by the temperature value collecting and maximum temperaturerise speed, the mean temperature of each battery module and the mean temperature of described battery pack.
2 is evaluation module, for by the temperature, temperature rise rate and the average temperature value that gather and calculate and predefined corresponding each threshold value of dispelling the heat compare, and the mean temperature peace that judges maximum temperature in each cell and the highest temperature rise rate, each battery module all temperature rise rate, described battery pack mean temperature peace all any one in temperature rise rate whether exceed its corresponding each heat radiation threshold value separately, described each heat radiation comprises successively and turn-offs threshold value, two-class heat dissipation threshold value and one-level heat radiation threshold value by threshold value height.
3 is prediction module, its material type, operating state, state-of-charge for the information that obtains according to acquisition module 1 and evaluation module 2 and battery calculates heat generation rate and the specific heat capacity of battery, and then the temperature field distribution of the battery unit of acquisition prediction, be specifically as follows:
1) all temperature rise rates of the mean temperature of real-time monitoring battery group peace, as judged, parameter exceedes level heat radiation threshold value, be that heat management system has started one-level cooling measure or two-class heat dissipation measure, prediction module starts to record all temperature rise rates of mean temperature peace of battery pack, and according to all temperature rise rates of mean temperature peace of the market demand fuzzy neural network prediction battery pack of record;
2) according to the temperature of prediction, and the type of battery, the operating state (charge/discharge) of battery, the state-of-charge of battery, application Bernardi heat generation rate model is estimated the heat generation rate of battery, and by the thermal capacitance weighted average of battery constituent material being estimated to the specific heat capacity of battery;
3) application finite element software is set up the thermal effect model of battery, and according to the battery heat generation rate of prediction and specific heat capacity, estimates the temperature field of battery;
4) by the temperature field of prediction battery pack and with the comparison of the mean temperature of the battery pack obtaining in real time, take following measure: if mean temperature is lower than 3 ℃ of predicted temperature fields or more, prediction module is not taken measures, otherwise prediction module feeds back to battery management center by control module, send alarm signal, trigger starting switch output as alarm signals such as display screen warning demonstration, warning lamp, loudspeakers, to reach alerting drivers or passenger's object, if desired, driver's current control measure of upgrading by hand;
5) monitor in real time the maximum temperature of cell, the highest temperature rise rate, mean temperature, average temperature rising speed, the peaceful all temperature rise rates of mean temperature of battery pack and the relation of corresponding one-level heat radiation threshold value, two-class heat dissipation threshold value or shutoff threshold value of battery module, as judge when parameter is less than corresponding threshold value, by control module, feed back to battery management center, reply step by step the operating state of battery pack.
4 is display module, and the information of demonstration at least comprises that the temperature field of the described battery unit of described prediction module prediction distributes and the alarm status of current battery unit.On this display module, can also comprise manual input part, for selecting one-level heat radiation threshold value, two-class heat dissipation threshold value for user or turn-off heat radiation threshold value in the scope of system regulation.
5 is control module, and the temperature field predicting for the comparative result that obtains according to described evaluation module 2 and described prediction module 3 distributes and takes corresponding control measure, described control measure to comprise one or more in heat radiation, shutoff and alarm measure.Can be specifically:
The result obtaining according to evaluation module and the control hierarchy of threshold value are taked corresponding control measure, as the mean temperature peace of the mean temperature of the maximum temperature of cell, the highest temperature rise rate, battery module, average temperature rising speed, battery pack all temperature rise rate any one judge that parameter exceedes corresponding one-level heat radiation threshold value, two-class heat dissipation threshold value or shutoff threshold value, takes respectively the measures such as corresponding wind-cooling heat dissipating, liquid radiating and/or turn-off circuit;
One-level heat radiation: adopt the blower fan that is assembled in internal system, utilize air to carry out cooling (or ventilation) to battery by parallel mode of ventilating, to reach battery pack heat radiation object.
Two-class heat dissipation: arrange pipeline at intermodule, or around module arrangement chuck, adopt water, ethylene glycol or cold-producing medium as heat transfer medium, to reach battery pack heat radiation object.
Turn-off: control module receives after cut-off signals, trigger the turn-off circuits such as startup is opened the light, relay, to reach the object that reduces the potential burning of battery, explosion hazard.
In accompanying drawing 1, the control measure that 3A will carry out for the comparative result obtaining according to evaluation module 2,3B is the temperature field control measure that will carry out that distribute based on prediction, and control module 3 selects the control measure of higher level or two kinds of control measure of selection all to adopt by the height of the rank of comparison control measure 3A and 3B.
The step a1-a5 flow chart for power battery thermal management method of the present invention shown in accompanying drawing 2.Wherein, be specially:
Step a1, for the real-time multi-point Temperature Collection module of cell, obtain maximum temperature and the highest temperature rise rate of each cell; Calculate all temperature rise rates of mean temperature peace of battery module and battery pack;
Step a2, utilize evaluation module by the temperature that gathers and calculate and temperature rise rate and predefined corresponding each heat radiation threshold value compare, and the mean temperature peace that judges maximum temperature in each cell and the highest temperature rise rate, each battery module all temperature rise rate, described battery pack mean temperature peace all any one in temperature rise rate whether exceed its corresponding each heat radiation threshold value separately, described each heat radiation comprises successively and turn-offs threshold value, two-class heat dissipation threshold value and one-level heat radiation threshold value by threshold value height:
Wherein, turn-offing threshold value is A level control hierarchy, as long as any one judges that parameter exceedes shutoff threshold value, no matter whether other parameters are normal, or/whether in one-level radiating state, or/whether in two-class heat dissipation state, all take turn-off circuit measure; Two-class heat dissipation threshold value is B level control hierarchy, as long as any one judges that parameter exceedes two-class heat dissipation threshold value, no matter whether other parameters are normal, or/whether in one-level radiating state, all take two-class heat dissipation measure; One-level heat radiation threshold value is C level control hierarchy, judges that parameter exceedes one-level heat radiation threshold value, takes one-level cooling measure.By this kind of control hierarchy, improve reliability and the fail safe of battery thermal management system.
Wherein, turn-offing threshold value is temperature and the temperature rise rate value of battery may there is the phenomenons such as thermal runaway time, each turn-offs threshold value and is greater than corresponding two-class heat dissipation threshold value, it is the two-class heat dissipation threshold value that the shutoff threshold value of battery cell maximum temperature is greater than battery cell maximum temperature, the shutoff threshold value of battery module mean temperature is greater than the two-class heat dissipation threshold value of battery cell maximum temperaturerise speed, the shutoff threshold value of battery module mean temperature is greater than the two-class heat dissipation threshold value of battery module mean temperature, the shutoff threshold value of battery module average temperature rising speed is greater than the two-class heat dissipation threshold value of battery module average temperature rising speed, the shutoff threshold value of battery pack mean temperature is greater than the two-class heat dissipation threshold value of battery pack mean temperature, the shutoff threshold value of battery pack average temperature rising speed is greater than the two-class heat dissipation threshold value of battery pack average temperature rising speed.Each two-class heat dissipation threshold value is greater than corresponding one-level heat radiation threshold value, it is the one-level heat radiation threshold value that the two-class heat dissipation threshold value of battery cell maximum temperature is greater than battery cell maximum temperature, the two-class heat dissipation threshold value of battery module mean temperature is greater than the one-level heat radiation threshold value of battery cell maximum temperaturerise speed, the two-class heat dissipation threshold value of battery module mean temperature is greater than the one-level heat radiation threshold value of battery module mean temperature, the two-class heat dissipation 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 two-class heat dissipation threshold value of battery pack mean temperature is greater than the one-level heat radiation threshold value of battery pack mean temperature, the two-class heat dissipation 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 the maximum temperature of battery cell, the maximum temperaturerise speed of battery cell, the mean temperature of battery module, the average temperature rising speed of battery module, any one in the average temperature rising speed of the mean temperature of battery pack and battery pack (is respectively the one-level heat radiation threshold value of battery cell maximum temperature higher than corresponding one-level heat radiation threshold value, 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 the one-level heat radiation threshold value of battery pack mean temperature and battery pack average temperature rising speed) time, battery pack is carried out to wind-cooling heat dissipating.
Preferably, when the maximum temperature of battery cell, the maximum temperaturerise speed of battery cell, the mean temperature of battery module, the average temperature rising speed of battery module, any one in the average temperature rising speed of the mean temperature of battery pack and battery pack (is respectively the two-class heat dissipation threshold value of battery cell maximum temperature higher than corresponding two-class heat dissipation threshold value, the two-class heat dissipation threshold value of battery cell maximum temperaturerise speed, the two-class heat dissipation threshold value of battery module mean temperature, the two-class heat dissipation threshold value of battery module average temperature rising speed, the two-class heat dissipation threshold value of the two-class heat dissipation threshold value of battery pack mean temperature and battery pack average temperature rising speed) time, battery pack is carried out to liquid radiating.
Preferably, adopt means of ventilation to discharge in time the potential pernicious gas producing in battery.
Step a3, the temperature field of predicting battery pack by prediction module, and compare with the mean temperature of the battery pack obtaining in real time, if mean temperature is lower than 3 ℃ of predicted temperature fields or more, prediction module is not taken measures, otherwise prediction module feeds back to battery management center by control module, sends alarm signal, remind driver or passenger, if desired, driver's current control measure of can upgrading by hand; Mean temperature, average temperature rising speed, the peaceful all temperature rise rates of mean temperature of battery pack and the relation of corresponding one-level heat radiation threshold value, two-class heat dissipation threshold value or shutoff threshold value of the maximum temperature of simultaneous real-time monitoring cell, the highest temperature rise rate, battery module, as judge when parameter is less than corresponding threshold value, by control module, feed back to battery management center, reply step by step the operating state of battery pack.
1) all temperature rise rates of the mean temperature of the real-time monitoring battery group of prediction module peace, as judged, parameter exceedes level heat radiation threshold value, be that heat management system has started one-level cooling measure or two-class heat dissipation measure, prediction module starts to record all temperature rise rates of mean temperature peace of battery pack, and according to all temperature rise rates of mean temperature peace of the market demand fuzzy neural network prediction battery pack of record;
2) according to the temperature of prediction, and the type of battery, the operating state (charge/discharge) of battery, the state-of-charge of battery, application Bernardi heat generation rate model is estimated the heat generation rate of battery, and by the thermal capacitance weighted average of battery constituent material being estimated to the specific heat capacity of battery;
3) application finite element software is set up the thermal effect model of battery, and according to the battery heat generation rate of prediction and specific heat capacity, estimates the temperature field of battery;
4) by the temperature field of prediction battery pack and with the comparison of the mean temperature of the battery pack obtaining in real time, take following measure: if mean temperature is lower than 3 ℃ of predicted temperature fields or more, prediction module is not taken measures, otherwise prediction module feeds back to battery management center by control module, send alarm signal, remind driver or passenger, if desired, driver's current control measure of can upgrading by hand;
5) monitor in real time all corresponding one-level heat radiation of temperature rise rate threshold value, two-class heat dissipation threshold values or turn-off the relation of threshold value of mean temperature peace of mean temperature, average temperature rising speed, the battery pack of the maximum temperature of cell, the highest temperature rise rate, battery module, as judge when parameter is less than corresponding threshold value, by control module, feed back to battery management center, reply step by step the operating state of battery pack.
Step a4, by display module 4, show that the temperature field of the described battery unit that at least comprises the prediction of described prediction module distributes and the alarm status of current battery unit.On this display module, can also comprise manual input part, for selecting one-level heat radiation threshold value, two-class heat dissipation threshold value for user or turn-off heat radiation threshold value in the scope of system regulation.This display module further can also show the battery temperature field distribution data that gather and evaluation module obtains.
The control measure that step a5,3A will carry out for the comparative result obtaining according to evaluation module 2,3B is the temperature field control measure that will carry out that distribute based on prediction, and control module 3 selects the control measure of higher level or two kinds of control measure of selection all to adopt by the height of the rank of comparison control measure 3A and 3B.
The major function of the heat management module under damage comprises: the temperature and the temperature rise rate that 1, detect each battery; 2, by directly or indirectly contacting initiatively or passive cool batteries with battery with air, liquid; 3, by ventilating, discharge in time the potential pernicious gas that battery produces; 4, by warning and/or cut-off loop, eliminate and control the potential danger of battery; 5, by the battery temperature field of comparison prediction and the battery temperature data of Real-time Collection, take corresponding subsequent response measure, thus the danger relevant with battery thermal stability during reduction electric automobile damage.
Temperature and temperature rise rate thereof when the heat management module monitors electric automobile under damage has an accident or meets with extreme weather, when battery context excess Temperature, by the flow of controlling cooling air flow or cooling liquid, realize the control to battery context temperature; When battery temperature rise rate exceedes corresponding threshold value, by control module, feed back to battery management center, turn-off circuit; 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 being comprised of the cell of 11Ah under damage 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, wherein the nominal voltage of cell is 3.7V, nominal capacity is 11Ah, cell composition: positive electrode active materials is LiMn2O4, negative active core-shell material is 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 to bump test, with data acquisition unit (model FLUKE 2620), gathered the temperature of each cell.
In certain bump test process, the maximum temperature of each cell and maximum temperaturerise speed data, and all temperature rise rates of the mean temperature of battery module peace, as shown in table 1.
Table 1 temperature and temperature rise rate data
One-level heat radiation threshold value, two-class heat dissipation threshold value and shutoff threshold value that this battery arranges are as shown in table 2.
The threshold value that table 2 arranges
Control module in the battery thermal management proposing through the present invention, the maximum temperature that can obtain cell exceedes two-class heat dissipation threshold value, the highest temperature rise rate of cell is less than one-level heat radiation threshold value, the mean temperature of battery module exceedes one-level heat radiation threshold value, the average temperature rising speed of battery module is less than one-level heat radiation threshold value, so battery thermal management system is taked two-class heat dissipation to battery, battery is carried out to liquid radiating.
Prediction module in the battery thermal management proposing through the present invention, can obtain after 156s, the maximum temperature (34.62 ℃) of cell is lower than its corresponding two-class heat dissipation threshold value (35 ℃) but still higher than its corresponding one-level heat radiation threshold value (30 ℃), by control module, feed back to battery management center, closing liquid cooling measure, open one-level cooling measure, battery is carried out to air heat radiation.After 456s, the maximum temperature (29.83 ℃) of cell is lower than its corresponding one-level heat radiation threshold value (30 ℃), by control module, feed back to battery management center, close one-level cooling measure, reply 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 damage, and set up thermal management device of battery based on the method, by the temperature of each cell gathering, obtain the maximum temperature of cell, the highest temperature rise rate, the mean temperature of battery module, average temperature rising speed, all temperature rise rates of mean temperature peace of battery pack, again by the one-level heat radiation threshold value of control module and setting, two-class heat dissipation threshold value and shutoff threshold, and take corresponding cooling, the control measure such as early warning or loop circuit, pass, simultaneously according to the comparative analysis of the temperature of the temperature field of prediction module prediction and Real-time Collection, electrokinetic cell is taked to report to the police or recover the follow-ups such as normal work, thereby reduce the danger that automobile produces due to battery under damage.
Although described embodiments of the present invention above in detail, in the situation that not departing from spirit of the present invention or inner characteristic, the present invention can also embody by other form.Therefore, above description is only used to explanation, rather than in order to limit.Protection scope of the present invention should be limited by the above description in claims rather than specification.Within all equivalence transformations in claim implication all should fall into protection scope of the present invention.
Claims (6)
1. a heat management device of power battery, comprising:
Acquisition module, for gathering and calculate temperature and the temperature rise rate of battery unit; Wherein, the temperature of each battery module that the temperature of described battery unit and temperature rise rate comprise each cell, be comprised of multiple described cells and the battery pack being formed by multiple described battery modules, cell described in each, the temperature rise rate of battery module and described battery pack described in each, and all temperature rise rates of mean temperature peace of temperature rise rate, described battery pack of mean temperature peace of the maximum temperature in each battery cell being calculated by the temperature value collecting and maximum temperaturerise speed, each battery module;
Evaluation module, for by the temperature, temperature rise rate and the average temperature value that gather and calculate and predefined corresponding each threshold value of dispelling the heat compare, and the mean temperature peace that judges maximum temperature in each cell and the highest temperature rise rate, each battery module all temperature rise rate, described battery pack mean temperature peace all any one in temperature rise rate whether exceed its corresponding each heat radiation threshold value separately, described each heat radiation threshold value comprises successively and turn-offs threshold value, two-class heat dissipation threshold value and one-level heat radiation threshold value by height;
It is characterized in that, also comprise,
Prediction module, calculates heat generation rate and the specific heat capacity of battery for the information that obtains according to acquisition module and evaluation module and material type, operating state, the state-of-charge of battery, and then the temperature field that obtains the battery unit of prediction distributes; Display module, the information of demonstration at least comprises that the temperature field of the described battery unit of described prediction module prediction distributes and the alarm status of current battery unit; Control module, the temperature field predicting for the comparative result that obtains according to described evaluation module and described prediction module distributes and takes corresponding control measure, described control measure to comprise one or more in heat radiation, shutoff and alarm measure;
That described cooling measure comprises is air-cooled, at least one in two kinds of cooling measures of liquid cooling, and described wind-cooling heat dissipating measure adopts blower fan.
2. heat management device of power battery according to claim 1, is characterized in that, described cooling measure carries out described one-level and/or two-class heat dissipation by the flow of controlling air-cooled and/or liquid-cooling heat radiation.
3. according to the heat management device of power battery described in any one in claim 1-2, it is characterized in that, described shutoff threshold value is A level control hierarchy, as long as any one judges that parameter exceedes shutoff threshold value, no matter whether other parameter is normal, or/whether in one-level radiating state, or/whether in two-class heat dissipation state, all take turn-off circuit measure; Described two-class heat dissipation threshold value is B level control hierarchy, as long as any one judges that parameter exceedes two-class heat dissipation threshold value, no matter whether other parameter is normal, or/whether in one-level radiating state, all take two-class heat dissipation measure; Described one-level heat radiation threshold value is C level control hierarchy, judges that parameter exceedes one-level heat radiation threshold value, takes one-level cooling measure.
4. a power battery thermal management method, comprises,
Step 1, utilize acquisition module collection and calculate temperature and the temperature rise rate of battery unit; Wherein, the temperature of each battery module that the temperature of described battery unit and temperature rise rate comprise each cell, be comprised of multiple described cells and the battery pack being formed by multiple described battery modules, cell described in each, the temperature rise rate of battery module and described battery pack described in each, and all temperature rise rates of mean temperature peace of temperature rise rate, described battery pack of mean temperature peace of the maximum temperature in each battery cell being calculated by the temperature value collecting and maximum temperaturerise speed, each battery module;
Step 2, utilize evaluation module by the temperature that gathers and calculate and temperature rise rate and predefined corresponding each heat radiation threshold value compare, and the mean temperature peace that judges maximum temperature in each cell and the highest temperature rise rate, each battery module all temperature rise rate, described battery pack mean temperature peace all any one in temperature rise rate whether exceed its corresponding each heat radiation threshold value separately, described each heat radiation comprises successively and turn-offs threshold value, two-class heat dissipation threshold value and one-level heat radiation threshold value by threshold value height;
It is characterized in that, also comprise,
Step 3, utilize prediction module material type, operating state, the state-of-charge of the information obtaining according to acquisition module and evaluation module and battery to be calculated to heat generation rate and the specific heat capacity of battery, and then the temperature field that obtains the battery unit of prediction distribute;
Step 4, utilize display module that the temperature field of the described battery unit of at least described prediction module prediction is distributed and the alarm status of current battery unit shows;
The temperature field that step 5, the comparative result obtaining for described evaluation module and described prediction module predict distributes and utilizes control module to take corresponding control measure, and described control measure comprise one or more in heat radiation, shutoff and alarm measure;
That described cooling measure comprises is air-cooled, at least one in two kinds of cooling measures of liquid cooling, and described wind-cooling heat dissipating measure adopts blower fan.
5. power battery thermal management method according to claim 4, is characterized in that, described cooling measure carries out described one-level and/or two-class heat dissipation by the flow of controlling air-cooled and/or liquid-cooling heat radiation.
6. according to the power battery thermal management method described in claim 4 or 5, described shutoff threshold value is A level control hierarchy, as long as any one judges that parameter exceedes shutoff threshold value, no matter whether other parameter is normal, or/whether in one-level radiating state, or/whether in two-class heat dissipation state, all take turn-off circuit measure; Described two-class heat dissipation threshold value is B level control hierarchy, as long as any one judges that parameter exceedes two-class heat dissipation threshold value, no matter whether other parameter is normal, or/whether in one-level radiating state, all take two-class heat dissipation measure; Described one-level heat radiation threshold value is C level control hierarchy, judges that parameter exceedes one-level heat radiation threshold value, takes one-level cooling measure.
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