CN102544618A - Liquid cooling temperature control and management method of power lithium ion battery - Google Patents
Liquid cooling temperature control and management method of power lithium ion battery Download PDFInfo
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Abstract
The invention discloses a liquid cooling temperature control and management method of a power lithium ion battery. The liquid cooling temperature control and management method comprises the steps of: 1) acquiring temperature and current; 2) obtaining a highest temperature value, a lowest temperature value, greatest temperature difference and liquid cooling system inlet and outlet temperature difference; 3) judging whether the current is large or not and computing a working state 1; 4) judging whether the temperature of the battery is high or not, computing a working state 2; 5) judging whether temperature difference of the battery is too great or not and computing a working state 3; 6) judging whether the outlet temperature of a battery pack is too high or not and computing a working state 4; 7) judging whether the temperature difference of circulating medium at the inlet and outlet of the battery pack is too great or not and computing a working state 5; and 8) comparing the computed working state 1, the working state 2, the working state 3, the working state 4 and the working state 5 to obtain a working state with the best heat dissipation effect for setting. The liquid cooling temperature control and management method of the power lithium ion battery solves the problems that the temperature of the battery is too high and the local temperature difference is too great, and has the beneficial effects that the performance of the battery is improved and the service life of battery is prolonged.
Description
Technical field
The present invention relates to lithium ion battery, particularly a kind of power lithium-ion battery liquid cooling temperature controlling management method.
Background technology
Because increasing the weight of day by day of global energy crisis and environmental pollution, developing of automobile industry also must be taked new solution.Electric automobile is the main flow that has become new automobile in the world wide.Advantages such as the high voltage of power lithium-ion battery, high-energy-density, excellent cycle performance, cleanliness without any pollution are considered to the most promising power train in vehicle application source.
Power lithium-ion battery is that car load provides actuating force, and its performance greatly influences vehicle performance.Power lithium-ion battery must be worked in certain temperature range, and its performance just can be in optimum state.For power lithium-ion battery, 15 ℃ of-35 ℃ of service behaviours are better, are considered to the best effort interval.Outside temperature range, work, not only influence cell discharge performance, shorten battery life, also can reduce the coefficient of safety of battery.Therefore the control of the temperature of power lithium-ion battery just becomes a major issue.
At present, prior art is generally taked air-cooled and the liquid cooling dual mode to the heat radiation of electrokinetic cell.Air-cooled employing electronic fan or natural wind carry out the cooling cooling of battery pack, and structure is comparatively simple still to cause heat radiation uneven easily, thereby the consistency that influences battery reduces battery life.Liquid cooling is meant adopts recirculated cooling water that heat in battery set is taken out of, and liquid cooling can realize that battery pack lowering temperature uniform and cooling-down effect are obvious.But how effectively to realize the cooling refrigerating function of liquid cooling apparatus, the assurance electrokinetic cell is worked in suitable temperature range and is avoided the battery local temperature too high simultaneously, is the problem that should solve at present.
Do not have at present to find explanation or report, do not collect both at home and abroad similarly porcelain as yet yet with similar techniques of the present invention.
Summary of the invention
In order effectively to realize the cooling refrigerating function of liquid cooling apparatus, the assurance electrokinetic cell is worked in suitable temperature range, avoids the battery local temperature too high simultaneously, the object of the present invention is to provide a kind of power lithium-ion battery liquid cooling temperature control and management method.Utilize the present invention; Can guarantee that electrokinetic cell is in the normal working temperature scope according to the operating current of the temperature of battery surface and battery operating state, avoid the too high and local excessive temperature differentials of temperature of powered cell through the control liquid cooling apparatus; Improve battery performance, extending battery life.
In order to reach the foregoing invention purpose, the technical scheme that the present invention is adopted for its technical problem of solution provides a kind of power lithium-ion battery liquid cooling temperature control and management method, comprises the steps:
Step 1, after temperature sensor and the current sensor initialization, beginning temperature acquisition, current acquisition comprise;
Collect the working temperature of electrokinetic cell by a plurality of temperature sensors in power battery pack surface; Temperature sensor by the import and export in battery pack system in the liquid cooling system collects the temperature that circulatory mediator is imported and exported in battery pack; Collect the operating current of battery by the current sensor of electrokinetic cell, said temperature data and current data send battery management system to;
Step 2, a plurality of battery operated temperature value that battery management system will collect is analyzed and is relatively drawn maximum temperature value, minimum temperature value and maximum temperature difference, simultaneously the liquid cooling system out temperature is calculated circulatory mediator and imports and exports the temperature difference;
Step 3 judges according to the big current temperature control and management of electrokinetic cell work method whether electric current is bigger, if then calculate corresponding liquid cooling apparatus operating state 1;
Step 4 judges according to the too high control and management method of temperature of powered cell whether battery temperature is too high, if then calculate corresponding liquid cooling apparatus operating state 2;
Step 5 judges according to electrokinetic cell excessive temperature differentials control and management method whether the battery temperature difference is excessive, if then calculate corresponding liquid cooling apparatus operating state 3;
Step 6 judges according to the too high control and management method of electrokinetic cell liquid cooling circulatory mediator temperature whether circulatory mediator is too high in the battery pack outlet temperature, if then calculate corresponding liquid cooling apparatus operating state 4;
Step 7 is imported and exported excessive temperature differentials control and management method according to electrokinetic cell liquid cooling circulatory mediator and is judged whether circulatory mediator is imported and exported the temperature difference in battery pack excessive, if then calculate corresponding liquid cooling apparatus operating state 5;
Step 8 is relatively calculated the operating state 1,2,3,4,5 that above-mentioned steps 3-step 7 obtains, and draws the strongest operating state of radiating effect, and adopts the drive unit work of circulatory mediator in the parameter control liquid cooling system of this operating state.
A kind of power lithium-ion battery liquid cooling of the present invention temperature control and management method; Owing to take above-mentioned technical scheme; With battery operated big electric current, battery excessive temperature, battery cross high temperature difference, liquid cooling circulatory mediator outlet temperature is too high imports and exports 5 parameters of excessive temperature differentials with the liquid cooling circulatory mediator different threshold values is set respectively; The startup of liquid cooling apparatus is divided into several stages, can either realizes that the heat radiation of battery pack requires to avoid simultaneously the excessive heat radiation of electrokinetic cell and the unequal problem of dispelling the heat.Liquid cooling apparatus is taken the heat that battery produces out of the electrokinetic cell group system through circulating cooling medium when work, the differentiation of its operating state is by the operating state decision of the drive unit of coolant.When electrokinetic cell during, carry out the forced heat radiation cooling through the operating state of control liquid cooling apparatus in the work of high temperature or heavy-current discharge operating mode.Under the situation of or the uneven excessive temperature differentials of local temperature too high, prevent because the battery performance loss that temperature anomaly causes through primer fluid device for cooling and the operating state of controlling liquid cooling apparatus at electrokinetic cell battery temperature in cycle charge discharge electric process repeatedly.
Since the present invention will collect battery temperature as the Control Parameter of liquid cooling apparatus; Simultaneously with the operating current of electrokinetic cell as Control Parameter, therefore solved the battery temperature that electrokinetic cell causes and has raise in the short time and the problem of the hysteresis of dispelling the heat when big current work.
Owing to the present invention also monitors the out temperature in battery pack system of the circulatory mediator in the liquid cooling system, and, therefore solved the function of liquid cooling system own and obtained the maximum problem of bringing into play as one of parameter of controlling liquid cooling system work.
Therefore, the invention solves the problem of the too high and local excessive temperature differentials of battery temperature, obtain the raising battery performance, the beneficial effect of extending battery life.
Description of drawings
Fig. 1 is the overview flow chart of the liquid cooling temperature control and management method of power lithium-ion battery of the present invention;
Fig. 2 is the big current work liquid cooling of a power lithium-ion battery temperature control and management flow chart;
Fig. 3 is the too high liquid cooling temperature of a power lithium-ion battery temperature control and management flow chart;
Fig. 4 is a power lithium-ion battery excessive temperature differentials liquid cooling temperature control and management flow chart;
Fig. 5 is the too high control and management flow chart of power lithium-ion battery liquid cooling circulatory mediator outlet temperature;
Fig. 6 is that power lithium-ion battery liquid cooling circulatory mediator is imported and exported excessive temperature differentials control and management flow chart.
Embodiment
In order to dispel the heat to power lithium-ion battery; Liquid cooling apparatus is installed in battery pack; This device has the circulating cooling medium passage; The drive unit of circulatory mediator flows circulatory mediator between battery pack system and heat abstractor, method of the present invention is based on this liquid cooling apparatus, and structure our company of this liquid cooling apparatus is just in separate case is applied for a patent.
The liquid cooling temperature control and management method of power lithium-ion battery of the present invention is to come the control and management liquid cooling system through two parameters of operating current of electrokinetic cell detected temperature in surface and electrokinetic cell; And the operating state of liquid cooling apparatus to be the operating state of the drive unit through circulatory mediator realize, thereby guarantee that battery works in the optimum temperature interval.
Below in conjunction with description of drawings the preferred embodiments of the present invention.
Fig. 1 is the overview flow chart of the liquid cooling temperature control and management method of power lithium-ion battery of the present invention; Shown in the embodiment of Fig. 1, this method comprises the steps:
Step 1, after temperature sensor and the current sensor initialization, beginning temperature acquisition, current acquisition;
Collect the working temperature of electrokinetic cell by a plurality of temperature sensors in power battery pack surface; Temperature sensor by the import and export in battery pack system in the liquid cooling system collects the temperature that circulatory mediator is imported and exported in battery pack, is collected the operating current of battery by the current sensor of electrokinetic cell.
Said temperature data and current data send battery management system to;
Step 2; The a plurality of battery operated temperature value that battery management system will collect is analyzed and is relatively drawn maximum temperature value, minimum temperature value and maximum temperature difference; Be the poor of maximum temperature value and minimum temperature value, simultaneously the liquid cooling system out temperature calculated circulatory mediator and import and export the temperature difference;
Step 3 judges according to the big current temperature control and management of electrokinetic cell work method whether electric current is bigger, if then calculate corresponding liquid cooling apparatus operating state 1;
Step 4 judges according to the too high control and management method of temperature of powered cell whether battery temperature is too high, if then calculate corresponding liquid cooling apparatus operating state 2;
Step 5 judges according to electrokinetic cell excessive temperature differentials control and management method whether the battery temperature difference is excessive, if then calculate corresponding liquid cooling apparatus operating state 3;
Step 6 judges according to the too high control and management method of electrokinetic cell liquid cooling circulatory mediator temperature whether circulatory mediator is too high in the battery pack outlet temperature, if then calculate corresponding liquid cooling apparatus operating state 4;
Step 7 is imported and exported excessive temperature differentials control and management method according to electrokinetic cell liquid cooling circulatory mediator and is judged whether circulatory mediator is imported and exported the temperature difference in battery pack excessive, if then calculate corresponding liquid cooling apparatus operating state 5;
Step 8 is relatively calculated the operating state 1,2,3,4,5 that above-mentioned steps 3-step 7 obtains, and draws the strongest operating state of radiating effect, and adopts the drive unit work of circulatory mediator in the parameter control liquid cooling system of this operating state.
Fig. 2 is an above-mentioned steps 3, the big current work liquid cooling of power lithium-ion battery temperature control and management flow chart; As shown in Figure 2, the control and management method of the big current temperature of electrokinetic cell work comprises:
Set the big current threshold 1,2 of different working ... N; Be big current threshold 1＜big current threshold 2＜...＜big current threshold N; And corresponding liquid cooling apparatus different working state, wherein big current threshold 1 corresponding liquid cooling apparatus starts, and big current threshold N is the lowest high-current value that electrokinetic cell can bear; Its corresponding liquid cooling apparatus is in the strongest operating state of heat radiation, and it further comprises following step;
Step 3-1, whether more battery operated electric current surpasses the big current threshold point of setting 1 of battery and is lower than threshold point 2, if then calculate corresponding liquid cooling apparatus operating state, and send result of calculation to the liquid cooling apparatus control system;
Step 3-2, if not, whether then more battery operated electric current surpasses the big current threshold point N-1 that sets and is lower than threshold point N, if then calculate corresponding liquid cooling apparatus operating state, and send result of calculation to the liquid cooling apparatus control system;
Step 3-3, if not, whether more battery operated once more electric current surpasses the big current threshold point N that sets, if then calculate corresponding liquid cooling apparatus operating state, and send the result to the liquid cooling apparatus control system;
Step 3-4, if not, then circulation, 3-1 begins from step.
Fig. 3 is an above-mentioned steps 4, the too high liquid cooling temperature of power lithium-ion battery temperature control and management flow chart; The too high control and management method of temperature of powered cell comprises:
Set different battery temperatures and cross high threshold 1,2 ... N; Be battery temperature cross high threshold 1＜battery temperature cross high threshold 2＜...＜battery temperature is crossed high threshold N; And corresponding liquid cooling apparatus different working state; Wherein minimum temperature is crossed the corresponding liquid cooling apparatus of high threshold and is started, and the corresponding liquid cooling apparatus of the highest temperature threshold point N is in the strongest operating state of heat radiation, and it further comprises following step:
Step 4-1, relatively whether the battery maximum temperature value surpasses the too high threshold point of setting 1 of battery temperature and is lower than the too high threshold point 2 of battery temperature, if then calculate corresponding liquid cooling apparatus operating state, and send result of calculation to the liquid cooling apparatus control system;
Step 4-2; If not, then relatively whether the battery maximum temperature value surpasses the too high threshold point N-1 of battery temperature that sets and is lower than the too high threshold point N of battery temperature, if; Then calculate corresponding liquid cooling apparatus operating state, and send result of calculation to the liquid cooling apparatus control system;
Step 4-3, if not, relatively whether the battery maximum temperature value surpasses the too high threshold point N of battery temperature that sets once more, if then calculate corresponding liquid cooling apparatus operating state, and send the result to the liquid cooling apparatus control system;
Step 4-4, if not, then circulation, 4-1 begins from step.
Fig. 4 is an above-mentioned steps 5, power lithium-ion battery excessive temperature differentials liquid cooling temperature control and management flow chart; The control and management method of electrokinetic cell excessive temperature differentials comprises:
Set different battery excessive temperature differentials threshold values 1,2 ... N; Be battery excessive temperature differentials threshold value 1＜battery excessive temperature differentials threshold value 2＜...＜battery excessive temperature differentials threshold value N; And corresponding liquid cooling apparatus different working state; The corresponding liquid cooling apparatus of wherein minimum excessive temperature differentials threshold value starts, and the corresponding liquid cooling apparatus of maximum excessive temperature differentials threshold point N is in the strongest operating state of heat radiation; It further comprises following step;
Step 5-1, relatively whether battery maximum temperature difference value surpasses the battery excessive temperature differentials threshold point of setting 1 and is lower than battery excessive temperature differentials threshold point 2, if then calculate corresponding liquid cooling apparatus operating state, and send result of calculation to the liquid cooling apparatus control system;
Step 5-2; If not, then relatively whether battery maximum temperature difference value surpasses the battery excessive temperature differentials threshold point N-1 that sets and is lower than battery excessive temperature differentials threshold point N, if; Then calculate corresponding liquid cooling apparatus operating state, and send result of calculation to the liquid cooling apparatus control system;
Step 5-3, if not, relatively whether battery maximum temperature difference value surpasses the battery excessive temperature differentials threshold point N that sets once more, if then calculate corresponding liquid cooling apparatus operating state, and send the result to the liquid cooling apparatus control system;
Step 5-4, if not, then circulation, 5-1 begins from step.
Fig. 5 is an above-mentioned steps 6, the too high control and management flow chart of power lithium-ion battery liquid cooling circulatory mediator outlet temperature; The too high control and management method of electrokinetic cell liquid cooling circulatory mediator temperature comprises:
Set different circulatory mediator outlet temperatures and cross high threshold 1,2 ... N; This temperature cross high threshold 1＜threshold value 2＜...＜threshold value N; The circulatory mediator outlet temperature is crossed high threshold 1 corresponding liquid cooling apparatus and is started, and the circulatory mediator outlet temperature is crossed the corresponding liquid cooling apparatus of high threshold N and is in the strongest operating state of heat radiation; It further comprises following step;
Step 6-1, whether comparison loop media outlet temperature value surpasses the too high threshold point of setting 1 of circulatory mediator outlet temperature and is lower than threshold point 2, if then calculate corresponding liquid cooling apparatus operating state, and send result of calculation to the liquid cooling apparatus control system;
Step 6-2; If not, whether comparison loop media outlet temperature value surpasses the too high threshold point N-1 of circulatory mediator outlet temperature that sets and is lower than threshold point N, if; Then calculate corresponding liquid cooling apparatus operating state, and send result of calculation to the liquid cooling apparatus control system;
If not, relatively whether battery maximum temperature difference value surpasses the battery excessive temperature differentials threshold point N that sets once more, if then calculate corresponding liquid cooling apparatus operating state, and send the result to the liquid cooling apparatus control system;
Step 6-4, if not, then circulation, 6-1 begins from step.
Fig. 6 is an above-mentioned steps 7, and power lithium-ion battery liquid cooling circulatory mediator is imported and exported excessive temperature differentials control and management flow chart; Electrokinetic cell liquid cooling circulatory mediator is imported and exported excessive temperature differentials control and management method and is comprised:
Set different circulatory mediators and import and export excessive temperature differentials threshold value 1,2 ... N; This temperature difference cross high threshold 1＜threshold value 2＜...＜threshold value N; Circulatory mediator is imported and exported excessive temperature differentials threshold value 1 corresponding liquid cooling apparatus and is started, and circulatory mediator is imported and exported the corresponding liquid cooling apparatus of excessive temperature differentials threshold point N and is in the strongest operating state of heat radiation; It further comprises following step;
Step 7-1; The comparison loop medium is imported and exported temperature approach and whether is surpassed the circulatory mediator import and export excessive temperature differentials threshold point of setting 1 and be lower than threshold point 2; If then calculate corresponding liquid cooling apparatus operating state, and send result of calculation to the liquid cooling apparatus control system;
Step 7-2; If not; Then whether comparison loop medium import and export temperature approach surpasses the circulatory mediator import and export excessive temperature differentials threshold point N-1 that sets and is lower than battery excessive temperature differentials threshold point N; If then calculate corresponding liquid cooling apparatus operating state, and send result of calculation to the liquid cooling apparatus control system;
Step 7-3, if not, the comparison loop medium is imported and exported the excessive temperature differentials threshold point N whether temperature approach surpasses setting once more, if then calculate corresponding liquid cooling apparatus operating state, and send the result to the liquid cooling apparatus control system;
Step 7-4, if not, then circulation, 7-1 begins from step.
In sum, it is battery operated in suitable temperature range that method of the present invention is that the operating state through control battery liquid cooling system guarantees, and the operating state of liquid cooling apparatus to be the operating state of the drive unit through circulatory mediator realize.
Further the course of work and the operation principle of a kind of power lithium-ion battery liquid cooling of the present invention temperature control and management method are described below.
According to Fig. 1; Variations in temperature and the variations in temperature of liquid cooling circulatory mediator of a plurality of points of forming its each module in the power lithium-ion battery group by a plurality of temperature sensors tests; Current sensor in the output circuit can be monitored battery electric current variation in the course of the work simultaneously; Holding wire sends temperature data that collects and current data to battery management system; Battery management system with the data analysis that receives relatively; Draw the outlet temperature of battery pack maximum temperature, minimum temperature and maximum temperature difference and circulatory mediator and import and export the temperature difference and operating current this moment; Successively according to the big current work of electrokinetic cell, battery temperature is too high and the battery excessive temperature differentials, liquid cooling circulatory mediator outlet temperature is too high and the temperature control and management method of importing and exporting excessive temperature differentials calculates the operation state values of liquid cooling apparatus, the different operating state value that relatively draws adopts the maximum operation state values of specific heat load; According to the drive unit of circulatory mediator in this parameter control liquid cooling apparatus, the working temperature of in time guaranteeing electrokinetic cell from many aspects can be not too high and heat is even.
Specify power lithium-ion battery liquid cooling temperature control and management method; Its marrow is whether five decision processes being comprised, promptly battery operated electric current are in whether the temperature temperature difference whether too high, battery of current state, battery excessive, whether the circulatory mediator outlet temperature too high and circulatory mediator whether import and export the temperature difference excessive.
First decision process: whether battery operated electric current is in current state
The operating state of electrokinetic cell is by the running status decision of vehicle.When vehicle launch, acceleration and climbing or charging quickly, need electrokinetic cell work under big electric current.Can be known that by the lithium ion battery characteristic operating current temperature of macrocell more raises rapidly more, and elevated temperature is high more.It relatively is that certain hysteresis quality is arranged with directly according to the variation of operating current operating state being set that battery cooling system cooling is provided with operating state according to the variation of battery temperature, the effect of the realization liquid cooling system that the latter can be more efficiently and effectively.
As Fig. 2 electrokinetic cell in the maximum current that can bear; Set the threshold value 1,2 of the big electric current of different working ... N; Be big current threshold 1＜big current threshold 2＜...＜big current threshold N, and corresponding liquid cooling apparatus different working state, wherein minimum big current threshold 1 corresponding liquid cooling apparatus starts; The highest big current threshold point N is the lowest high-current value that electrokinetic cell can bear, and its corresponding liquid cooling apparatus is in the strongest operating state of heat radiation.Whether more battery operated electric current surpasses the big current threshold point of setting 1 of battery and is lower than threshold point 2, if then calculate corresponding liquid cooling apparatus operating state, and send result of calculation to the liquid cooling apparatus control system; If not, then in like manner judge by different big current thresholds successively, and calculate corresponding liquid cooling apparatus operating state, send parameter to the liquid cooling apparatus control system, thereby realize that liquid cooling apparatus is in best operating state.If judge big current threshold N, then circulation is judged from threshold value 1 beginning once more again.
Second decision process: whether battery temperature is too high
Electrokinetic cell is in vehicle continuous service process; Battery constantly carries out charge and discharge cycles; Battery is constantly emitted its temperature of heat and can be raise, and at this moment can carry out stable heat radiation assurance battery and in the best effort interval, work through the work of suitable management liquid cooling apparatus.
Like Fig. 3; Be higher than the electrokinetic cell optimum working temperature and be lower than between the maximum operating temperature that battery allows; Set different battery temperatures as required and cross high threshold 1,2 ... N, promptly battery temperature cross high threshold 1＜battery temperature cross high threshold 2＜...＜battery temperature is crossed high threshold N, and corresponding liquid cooling apparatus different working state; Wherein minimum temperature is crossed the corresponding liquid cooling apparatus of high threshold and is started, and the corresponding liquid cooling apparatus of the highest temperature threshold point N is in the strongest operating state of heat radiation.Relatively whether the battery maximum temperature value surpasses the too high threshold point of setting 1 of battery temperature and is lower than the too high threshold point 2 of battery temperature, if then calculate corresponding liquid cooling apparatus operating state, and send result of calculation to the liquid cooling apparatus control system; If not, then in like manner cross high threshold by different battery temperatures successively and judge, and calculate corresponding liquid cooling apparatus operating state, send parameter to the liquid cooling apparatus control system, thereby realize the suitable operating state of liquid cooling apparatus.Cross high threshold N if judge battery temperature, then circulation is judged from threshold value 1 beginning again.
The 3rd decision process: whether the battery temperature difference is excessive
Electrokinetic cell system assembles to a hundreds of monomer electricity core by tens.Electrokinetic cell in the vehicle operating process because the temperature of the characteristic battery surface of monomer electricity core itself has certain distinctiveness.If this temperature difference is big more, can aggravate the inconsistency of each monomer electricity core in the battery pack, cause whole power battery pack decreased performance, descend to useful life.Therefore, need be when the battery temperature difference acquire a certain degree, the processing of lowering the temperature, the mobile meeting of circulatory mediator reduces this difference.
Like Fig. 4; Before battery temperature reaches maximum temperature difference; Set different battery excessive temperature differentials threshold values 1,2 ... N, promptly battery excessive temperature differentials threshold value 1＜battery excessive temperature differentials threshold value 2＜...＜battery excessive temperature differentials threshold value N, and corresponding liquid cooling apparatus different working state; The excessive threshold point 1 corresponding liquid cooling apparatus of wherein minimum temperature starts, and the corresponding liquid cooling apparatus of maximum temperature difference threshold point N is in the strongest operating state of heat radiation.Relatively whether battery maximum temperature difference value surpasses the battery excessive temperature differentials threshold point of setting 1 and is lower than battery excessive temperature differentials threshold point 2, if then calculate corresponding liquid cooling apparatus operating state, and send result of calculation to the liquid cooling apparatus control system; If not; In like manner, then compare battery maximum temperature difference value successively and whether surpass the next battery excessive temperature differentials threshold point of setting and be lower than again next battery excessive temperature differentials threshold point, if; Then calculate corresponding liquid cooling apparatus operating state, and send result of calculation to the liquid cooling apparatus control system.If judge battery excessive temperature differentials threshold value N, then circulation is judged from threshold value 1 beginning again.
The 4th decision process: whether the circulatory mediator outlet temperature is too high
The liquid cooling system of electrokinetic cell is taken the heat that produces in battery operated out of battery pack system through the mobile of circulatory mediator.Circulatory mediator is through carrying out exchange heat with battery pack, and the circulatory mediator temperature in the battery pack exit can raise.Even the temperature of circulatory mediator outlet still is lower than the highest optimum temperature of battery, if even heat can not shed through cooling system, heat will constantly be accumulate to the circulatory mediator temperature to be continued to be increased to outside the operating temperature range of battery fast.For avoiding the appearance of this situation, need be to the work that the circulatory mediator outlet temperature is monitored and liquid cooling system is controlled in participation as one of parameter.
Like Fig. 5; Set the outlet temperature of circulatory mediator and cross high threshold 1,2 ... N; Be the circulatory mediator outlet temperature cross high threshold 1＜circulatory mediator temperature cross high threshold 2＜...＜circulatory mediator temperature is crossed high threshold N; And corresponding liquid cooling apparatus different working state, the corresponding liquid cooling apparatus of the too high threshold point N of maximum temperature is in the strongest operating state of heat radiation.Whether comparison loop media outlet temperature value surpasses the too high threshold point of setting 1 of temperature and is lower than threshold point 2, if then calculate corresponding liquid cooling apparatus operating state, and send result of calculation to the liquid cooling apparatus control system; If not; In like manner, then whether comparison loop media outlet temperature value surpasses the too high threshold point of setting of next temperature and is lower than the too high threshold point of next temperature again successively, if; Then calculate corresponding liquid cooling apparatus operating state, and send result of calculation to the liquid cooling apparatus control system.Cross high threshold N if judge the circulatory mediator outlet temperature, then circulation is judged from threshold value 1 beginning again.
The 5th decision process: whether circulatory mediator is imported and exported the temperature difference excessive
The circulatory mediator of low temperature gets into battery pack system from the import of liquid cooling plate, and through carrying out heat exchange with battery pack, the circulatory mediator of high temperature flows out battery pack system from the outlet of liquid cooling plate.When the import and export temperature difference of circulatory mediator in battery pack is big, can cause the monomer electricity core temperature of circulatory mediator import department low excessively, and the monomer in circulatory mediator exit electricity core temperature is too high.Temperature is apparent in view to the electrochemical reaction influence of battery, and the duration is longer, and the consistency of battery reduces, thereby causes cell integrated decreased performance.Therefore, need the out temperature of monitoring circulatory mediator, its temperature difference as one of parameter of liquid cooling system work, is reduced the import and export temperature difference of circulatory mediator through adjustment liquid cooling system operating state.
Like Fig. 6; Set the import and export excessive temperature differentials threshold value 1,2 of circulatory mediator ... N; Be circulatory mediator import and export excessive temperature differentials threshold value 1＜import and export excessive temperature differentials threshold value 2＜...＜import and export excessive temperature differentials threshold value N; And corresponding liquid cooling apparatus different working state, the corresponding liquid cooling apparatus of maximum import and export excessive temperature differentials threshold point N is in the strongest operating state of heat radiation.The comparison loop medium is imported and exported temperature approach and whether is surpassed the too high threshold point of setting 1 of temperature and be lower than threshold point 2, if then calculate corresponding liquid cooling apparatus operating state, and send result of calculation to the liquid cooling apparatus control system; If not; In like manner, then whether comparison loop medium import and export temperature approach surpasses the next threshold point of setting and is lower than next threshold point again successively, if; Then calculate corresponding liquid cooling apparatus operating state, and send result of calculation to the liquid cooling apparatus control system.Import and export excessive temperature differentials threshold value N if judge circulatory mediator, then circulation is judged from threshold value 1 beginning again.
Claims (6)
1. a power lithium-ion battery liquid cooling temperature control and management method is characterized in that this method comprises the steps:
Step 1 after temperature sensor and the current sensor initialization, begins to carry out temperature acquisition, current acquisition, comprises;
Collect the working temperature of electrokinetic cell by a plurality of temperature sensors in power battery pack surface; Temperature sensor by the import and export in battery pack system in the liquid cooling system collects the temperature that circulatory mediator is imported and exported in battery pack, is collected the operating current of battery by the current sensor of electrokinetic cell;
Said temperature data and current data send battery management system to;
Step 2, a plurality of battery operated temperature value that battery management system will collect is analyzed and is relatively drawn maximum temperature value, minimum temperature value and maximum temperature difference, simultaneously the liquid cooling system out temperature is calculated circulatory mediator and imports and exports the temperature difference;
Step 3 judges according to the big current temperature control and management of electrokinetic cell work method whether electric current is bigger, if then calculate corresponding liquid cooling apparatus operating state [1];
Step 4 judges according to the too high control and management method of temperature of powered cell whether battery temperature is too high, if then calculate corresponding liquid cooling apparatus operating state [2];
Step 5 judges according to electrokinetic cell excessive temperature differentials control and management method whether the battery temperature difference is excessive, if then calculate corresponding liquid cooling apparatus operating state [3];
Step 6 judges according to the too high control and management method of electrokinetic cell liquid cooling circulatory mediator temperature whether circulatory mediator is too high in the battery pack outlet temperature, if then calculate corresponding liquid cooling apparatus operating state [4];
Step 7 is imported and exported excessive temperature differentials control and management method according to electrokinetic cell liquid cooling circulatory mediator and is judged whether circulatory mediator is imported and exported the temperature difference in battery pack excessive, if then calculate corresponding liquid cooling apparatus operating state [5];
Step 8 is relatively calculated operating state [1], [2], [3], [4], [5] that above-mentioned steps 3 to step 7 obtains, draws the strongest operating state of radiating effect, and adopts the drive unit work of circulatory mediator in the parameter control liquid cooling system of this operating state.
2. liquid cooling temperature control and management method as claimed in claim 1 is characterized in that: described step 3, and the big current temperature control and management of electrokinetic cell work method comprises:
Set the big current threshold 1,2 of different working ... N; Be big current threshold 1＜big current threshold 2＜...＜big current threshold N; And corresponding liquid cooling apparatus different working state, wherein big current threshold 1 corresponding liquid cooling apparatus starts, and big current threshold N is the lowest high-current value that electrokinetic cell can bear; Its corresponding liquid cooling apparatus is in the strongest operating state of heat radiation, and it further comprises following step;
Step 3-1, whether more battery operated electric current surpasses the big current threshold point of setting 1 of battery and is lower than threshold point 2, if then calculate corresponding liquid cooling apparatus operating state, and send result of calculation to the liquid cooling apparatus control system;
Step 3-2, if not, whether then more battery operated electric current surpasses the big current threshold point N-1 that sets and is lower than threshold point N, if then calculate corresponding liquid cooling apparatus operating state, and send result of calculation to the liquid cooling apparatus control system;
If not, whether more battery operated once more electric current surpasses the big current threshold point N that sets, if then calculate corresponding liquid cooling apparatus operating state, and send the result to the liquid cooling apparatus control system;
Step 3-4, if not, then circulation, 3-1 begins from step.
3. liquid cooling temperature control and management method as claimed in claim 1 is characterized in that: described step 4, and the too high control and management method of temperature of powered cell comprises:
Set different battery temperatures and cross high threshold 1,2 ... N; Be battery temperature cross high threshold 1＜battery temperature cross high threshold 2＜...＜battery temperature is crossed high threshold N; And corresponding liquid cooling apparatus different working state; Wherein minimum temperature is crossed the corresponding liquid cooling apparatus of high threshold and is started, and the corresponding liquid cooling apparatus of the highest temperature threshold point N is in the strongest operating state of heat radiation, and it further comprises following step;
Step 4-1, relatively whether the battery maximum temperature value surpasses the too high threshold point of setting 1 of battery temperature and is lower than the too high threshold point 2 of battery temperature, if then calculate corresponding liquid cooling apparatus operating state, and send result of calculation to the liquid cooling apparatus control system;
Step 4-2; If not, then relatively whether the battery maximum temperature value surpasses the too high threshold point N-1 of battery temperature that sets and is lower than the too high threshold point N of battery temperature, if; Then calculate corresponding liquid cooling apparatus operating state, and send result of calculation to the liquid cooling apparatus control system;
Step 4-3, if not, relatively whether the battery maximum temperature value surpasses the too high threshold point N of battery temperature that sets once more, if then calculate corresponding liquid cooling apparatus operating state, and send the result to the liquid cooling apparatus control system;
Step 4-4, if not, then circulation, 4-1 begins from step.
4. liquid cooling temperature control and management method as claimed in claim 1 is characterized in that: described step 5, and the control and management method of electrokinetic cell excessive temperature differentials comprises:
Set different battery excessive temperature differentials threshold values 1,2 ... N; Be battery excessive temperature differentials threshold value 1＜battery excessive temperature differentials threshold value 2＜...＜battery excessive temperature differentials threshold value N; And corresponding liquid cooling apparatus different working state; The corresponding liquid cooling apparatus of wherein minimum excessive temperature differentials threshold value starts, and the corresponding liquid cooling apparatus of maximum excessive temperature differentials threshold point N is in the strongest operating state of heat radiation; It further comprises following step;
Step 5-1, relatively whether battery maximum temperature difference value surpasses the battery excessive temperature differentials threshold point of setting 1 and is lower than battery excessive temperature differentials threshold point 2, if then calculate corresponding liquid cooling apparatus operating state, and send result of calculation to the liquid cooling apparatus control system;
Step 5-2; If not, then relatively whether battery maximum temperature difference value surpasses the battery excessive temperature differentials threshold point N-1 that sets and is lower than battery excessive temperature differentials threshold point N, if; Then calculate corresponding liquid cooling apparatus operating state, and send result of calculation to the liquid cooling apparatus control system;
Step 5-3, if not, relatively whether battery maximum temperature difference value surpasses the battery excessive temperature differentials threshold point N that sets once more, if then calculate corresponding liquid cooling apparatus operating state, and send the result to the liquid cooling apparatus control system;
Step 5-4, if not, then circulation, 5-1 begins from step.
5. liquid cooling temperature control and management method as claimed in claim 1 is characterized in that: described step 6, and the too high control and management method of electrokinetic cell liquid cooling circulatory mediator temperature comprises:
Set different circulatory mediator outlet temperatures and cross high threshold 1,2 ... N; This temperature cross high threshold 1＜threshold value 2＜...＜threshold value N; The circulatory mediator outlet temperature is crossed high threshold 1 corresponding liquid cooling apparatus and is started, and the circulatory mediator outlet temperature is crossed the corresponding liquid cooling apparatus of high threshold N and is in the strongest operating state of heat radiation; It further comprises following step;
Step 6-1, whether comparison loop media outlet temperature value surpasses the too high threshold point of setting 1 of circulatory mediator outlet temperature and is lower than threshold point 2, if then calculate corresponding liquid cooling apparatus operating state, and send result of calculation to the liquid cooling apparatus control system;
Step 6-2; If not, whether comparison loop media outlet temperature value surpasses the too high threshold point N-1 of circulatory mediator outlet temperature that sets and is lower than threshold point N, if; Then calculate corresponding liquid cooling apparatus operating state, and send result of calculation to the liquid cooling apparatus control system;
Step 6-3, if not, relatively whether battery maximum temperature difference value surpasses the battery excessive temperature differentials threshold point N that sets once more, if then calculate corresponding liquid cooling apparatus operating state, and send the result to the liquid cooling apparatus control system;
Step 6-4, if not, then circulation, 6-1 begins from step.
6. liquid cooling temperature control and management method as claimed in claim 1 is characterized in that: described step 7, and the control and management method that electrokinetic cell liquid cooling circulatory mediator is imported and exported excessive temperature differentials comprises:
Set different circulatory mediators and import and export excessive temperature differentials threshold value 1,2 ... N; This temperature difference cross high threshold 1＜threshold value 2＜...＜threshold value N; Circulatory mediator is imported and exported excessive temperature differentials threshold value 1 corresponding liquid cooling apparatus and is started, and circulatory mediator is imported and exported the corresponding liquid cooling apparatus of excessive temperature differentials threshold point N and is in the strongest operating state of heat radiation; It further comprises following step;
Step 7-1; The comparison loop medium is imported and exported temperature approach and whether is surpassed the circulatory mediator import and export excessive temperature differentials threshold point of setting 1 and be lower than threshold point 2; If then calculate corresponding liquid cooling apparatus operating state, and send result of calculation to the liquid cooling apparatus control system;
Step 7-2; If not; Then whether comparison loop medium import and export temperature approach surpasses the circulatory mediator import and export excessive temperature differentials threshold point N-1 that sets and is lower than battery excessive temperature differentials threshold point N; If then calculate corresponding liquid cooling apparatus operating state, and send result of calculation to the liquid cooling apparatus control system;
Step 7-3, if not, the comparison loop medium is imported and exported the excessive temperature differentials threshold point N whether temperature approach surpasses setting once more, if then calculate corresponding liquid cooling apparatus operating state, and send the result to the liquid cooling apparatus control system;
Step 7-4, if not, then circulation, 7-1 begins from step.
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