CN102544618B - 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 control and management method of power lithium-ion battery liquid cooling temperature.
Background technology
Due to day by day increasing the weight of of global energy crisis and environmental pollution, the development of auto industry also must be taked new solution.Electric automobile is the main flow that has become new automobile in world wide.The high voltage of power lithium-ion battery, high-energy-density, the good advantage such as cycle performance, cleanliness without any pollution are considered to the most promising power train in vehicle application source.
Power lithium-ion battery provides actuating force for car load, and its performance greatly affects 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 DEG C of-35 DEG C of service behaviours are better, are considered to best effort interval.Work outward in temperature range, not only affect cell discharge performance, shorten battery life, also can reduce the coefficient of safety of battery.Therefore the temperature control of power lithium-ion battery just becomes a major issue.
At present, prior art is generally taked air-cooled and two kinds of modes of liquid cooling to the heat radiation of electrokinetic cell.Air-cooled employing electronic fan or natural wind carry out the cooling down of battery pack, and structure is comparatively simple still easily causes heat radiation uneven, thereby affect the consistency reduction battery life of battery.Liquid cooling refer to adopt recirculated cooling water heat in battery set is taken out of, liquid cooling can realize battery pack lowering temperature uniform and cooling-down effect obvious.But how effectively to realize the cooling down function of liquid cooling apparatus, guarantee electrokinetic cell is worked and is avoided battery local temperature too high simultaneously in suitable temperature range, is the problem that should solve at present.
Do not find at present explanation or the report of technology similar to the present invention, not yet collect both at home and abroad similarly porcelain yet.
Summary of the invention
In order effectively to realize the cooling down function of liquid cooling apparatus, guarantee electrokinetic cell is worked in suitable temperature range, avoids 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 be according to the operating current of the temperature of battery surface and battery by controlling the operating state of liquid cooling apparatus, guarantee electrokinetic cell, within the scope of normal working temperature, is avoided the too high and local excessive temperature differentials of temperature of powered cell, improve battery performance, extending battery life.
In order to reach foregoing invention object, the technical scheme that the present invention adopts for its technical problem of solution is to provide a kind of power lithium-ion battery liquid cooling temperature control and management method, comprises the steps:
Step 1, after temperature sensor and current sensor initialization, starts temperature acquisition, current acquisition, comprises;
Collected the working temperature of electrokinetic cell by the multiple temperature sensors in power battery pack surface, collect by the temperature sensor of the import and export in battery pack system in liquid cooling system the temperature that circulatory mediator is imported and exported in battery pack, 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, battery management system is analyzed the multiple battery operated temperature value collecting relatively to draw maximum temperature value, minimum temperature value and maximum temperature difference, liquid cooling system out temperature is calculated to circulatory mediator simultaneously and imports and exports the temperature difference;
Step 3, judges that according to the large current temperature control and management of electrokinetic cell work method whether electric current is larger, if so, calculates corresponding liquid cooling apparatus operating state 1;
Step 4, judges that according to the too high control and management method of temperature of powered cell whether battery temperature is too high, if so, calculates corresponding liquid cooling apparatus operating state 2;
Step 5, judges that according to electrokinetic cell excessive temperature differentials control and management method whether the battery temperature difference is excessive, if so, calculates corresponding liquid cooling apparatus operating state 3;
Step 6, judges that according to electrokinetic cell liquid cooling circulatory mediator excess Temperature control and management method whether circulatory mediator is too high in battery pack outlet temperature, if so, calculates corresponding liquid cooling apparatus operating state 4;
Step 7, imports and exports excessive temperature differentials control and management method according to electrokinetic cell liquid cooling circulatory mediator and judges that whether circulatory mediator is excessive in the battery pack import and export temperature difference, if so, calculates corresponding liquid cooling apparatus operating state 5;
Step 8, relatively calculates the operating state 1,2,3,4,5 that above-mentioned steps 3-step 7 obtains, and draws the operating state that radiating effect is the strongest, 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 temperature of the present invention control and management method, owing to taking above-mentioned technical scheme, battery operated large electric current, battery excessive temperature, battery are crossed to the too high and liquid cooling circulatory mediator of high temperature difference, liquid cooling circulatory mediator outlet temperature to be imported and exported 5 parameters of excessive temperature differentials different threshold values is set respectively, the startup of liquid cooling apparatus is divided into several stages, and the heat radiation that can either realize battery pack requires to avoid the excessive heat radiation of electrokinetic cell and the unequal problem of dispelling the heat simultaneously.Liquid cooling apparatus is in the time of work, and heat battery being produced by circulating cooling medium is taken electrokinetic cell group system out of, and the differentiation of its operating state is determined by the operating state of the drive unit of coolant.When electrokinetic cell is during in the work of high temperature or heavy-current discharge operating mode, by controlling the operating state of liquid cooling apparatus, to carry out forced heat radiation cooling.At electrokinetic cell battery temperature in cycle charge discharge electric process repeatedly too high the or uneven excessive temperature differentials of local temperature in the situation that, prevent by primer fluid device for cooling the operating state of controlling liquid cooling apparatus the battery performance loss causing due to temperature anomaly.
Due to the present invention using collect battery temperature as the control parameter of liquid cooling apparatus, simultaneously using the operating current of electrokinetic cell as controlling parameter, therefore solve and in battery temperature short time that electrokinetic cell causes in the time of large current work, raise and problem that heat radiation lags behind.
Because the present invention also monitors the out temperature in battery pack system of the circulatory mediator in liquid cooling system, and as controlling one of parameter of liquid cooling system work, therefore solve the function of liquid cooling system own and obtained the maximum problem of bringing into play.
Therefore, the invention solves the problem of the too high and local excessive temperature differentials of battery temperature, obtain raising battery performance, the beneficial effect of extending battery life.
Brief description of the 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 large current work liquid cooling temperature of power lithium-ion battery control and management flow chart;
Fig. 3 is power lithium-ion battery excess Temperature liquid cooling temperature control and management flow chart;
Fig. 4 is 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 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 that the temperature that detects by electrokinetic cell surface and two parameters of operating current of electrokinetic cell are carried out control and management liquid cooling system, and the operating state that the operating state of liquid cooling apparatus is the drive unit by circulatory mediator realizes, thereby ensure that battery works in optimum temperature interval.
Below in conjunction with brief description of the 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; As shown in the embodiment of Fig. 1, the method comprises the steps:
Step 1, after temperature sensor and current sensor initialization, starts temperature acquisition, current acquisition;
Collected the working temperature of electrokinetic cell by the multiple temperature sensors in power battery pack surface, collect by the temperature sensor of the import and export in battery pack system in liquid cooling system the temperature that circulatory mediator is imported and exported in battery pack, 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, battery management system is analyzed the multiple battery operated temperature value collecting relatively to draw maximum temperature value, minimum temperature value and maximum temperature difference, be the poor of maximum temperature value and minimum temperature value, liquid cooling system out temperature calculated to circulatory mediator simultaneously and import and export the temperature difference;
Step 3, judges that according to the large current temperature control and management of electrokinetic cell work method whether electric current is larger, if so, calculates corresponding liquid cooling apparatus operating state 1;
Step 4, judges that according to the too high control and management method of temperature of powered cell whether battery temperature is too high, if so, calculates corresponding liquid cooling apparatus operating state 2;
Step 5, judges that according to electrokinetic cell excessive temperature differentials control and management method whether the battery temperature difference is excessive, if so, calculates corresponding liquid cooling apparatus operating state 3;
Step 6, judges that according to electrokinetic cell liquid cooling circulatory mediator excess Temperature control and management method whether circulatory mediator is too high in battery pack outlet temperature, if so, calculates corresponding liquid cooling apparatus operating state 4;
Step 7, imports and exports excessive temperature differentials control and management method according to electrokinetic cell liquid cooling circulatory mediator and judges that whether circulatory mediator is excessive in the battery pack import and export temperature difference, if so, calculates corresponding liquid cooling apparatus operating state 5;
Step 8, relatively calculates the operating state 1,2,3,4,5 that above-mentioned steps 3-step 7 obtains, and draws the operating state that radiating effect is the strongest, and adopts the drive unit work of circulatory mediator in the parameter control liquid cooling system of this operating state.
Fig. 2 is above-mentioned steps 3, the large current work liquid cooling temperature of power lithium-ion battery control and management flow chart; As shown in Figure 2, the control and management method of the large current temperature of electrokinetic cell work comprises:
Set the large current threshold 1,2 of different work ... N, be large current threshold 2 < of large current threshold 1 < ... the large current threshold N of <, and the operating state that corresponding liquid cooling apparatus is different, wherein the corresponding liquid cooling apparatus of large current threshold 1 starts, large 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 exceedes the large current threshold point 1 of battery of setting and lower than threshold point 2, if so, calculates corresponding liquid cooling apparatus operating state, and send result of calculation to liquid cooling apparatus control system;
Step 3-2, if not, whether more battery operated electric current exceedes the large current threshold point N-1 of setting and lower than threshold point N, if so, calculates corresponding liquid cooling apparatus operating state, and send result of calculation to liquid cooling apparatus control system;
Step 3-3, if not, whether more battery operated electric current exceedes the large current threshold point N of setting again, if so, calculates corresponding liquid cooling apparatus operating state, and sends result to liquid cooling apparatus control system;
Step 3-4, if not, circulation, from step 3-1.
Fig. 3 is above-mentioned steps 4, power lithium-ion battery excess Temperature liquid cooling 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 that battery temperature is crossed high threshold 1 < battery temperature and crossed high threshold 2 < ... < battery temperature is crossed high threshold N, and the operating state that corresponding liquid cooling apparatus is different, wherein the corresponding liquid cooling apparatus of minimum excess Temperature threshold value starts, 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 battery maximum temperature value exceedes the too high threshold point 1 of battery temperature of setting and lower than the too high threshold point 2 of battery temperature, if so, calculates corresponding liquid cooling apparatus operating state, and send result of calculation to liquid cooling apparatus control system;
Step 4-2, if not, relatively whether battery maximum temperature value exceedes the too high threshold point N-1 of battery temperature of setting and lower than the too high threshold point N of battery temperature, if, calculate corresponding liquid cooling apparatus operating state, and send result of calculation to liquid cooling apparatus control system;
Step 4-3, if not, the too high threshold point N of battery temperature that relatively whether battery maximum temperature value exceedes setting again, if so, calculates corresponding liquid cooling apparatus operating state, and sends result to liquid cooling apparatus control system;
Step 4-4, if not, circulation, from step step 4-1.
Fig. 4 is 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 the operating state that corresponding liquid cooling apparatus is different, wherein the corresponding liquid cooling apparatus of 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 exceedes the battery excessive temperature differentials threshold point 1 of setting and lower than battery excessive temperature differentials threshold point 2, if so, calculates corresponding liquid cooling apparatus operating state, and send result of calculation to liquid cooling apparatus control system;
Step 5-2, if not, relatively whether battery maximum temperature difference value exceedes the battery excessive temperature differentials threshold point N-1 of setting and lower than battery excessive temperature differentials threshold point N, if, calculate corresponding liquid cooling apparatus operating state, and send result of calculation to liquid cooling apparatus control system;
Step 5-3, if not, the battery excessive temperature differentials threshold point N that relatively whether battery maximum temperature difference value exceedes setting again, if so, calculates corresponding liquid cooling apparatus operating state, and sends result to liquid cooling apparatus control system;
Step 5-4, if not, circulation, from step 5-1.
Fig. 5 is above-mentioned steps 6, the too high control and management flow chart of power lithium-ion battery liquid cooling circulatory mediator outlet temperature; The control and management method of electrokinetic cell liquid cooling circulatory mediator excess Temperature comprises:
Set different circulatory mediator outlet temperatures and cross high threshold 1,2 ... N, this excess Temperature threshold value 1 < threshold value 2 < ... < threshold value N, circulatory mediator outlet temperature is crossed the corresponding liquid cooling apparatus of high threshold 1 and is started, and circulatory mediator outlet temperature is crossed the corresponding liquid cooling apparatus of high threshold N in the strongest operating state of heat radiation; It further comprises following step;
Step 6-1, whether comparison loop media outlet temperature value exceedes the too high threshold point 1 of circulatory mediator outlet temperature of setting and lower than threshold point 2, if so, calculates corresponding liquid cooling apparatus operating state, and send result of calculation to liquid cooling apparatus control system;
Step 6-2, if not, whether comparison loop media outlet temperature value exceedes the too high threshold point N-1 of circulatory mediator outlet temperature of setting and lower than threshold point N, if, calculate corresponding liquid cooling apparatus operating state, and send result of calculation to liquid cooling apparatus control system;
If not, the battery excessive temperature differentials threshold point N that relatively whether battery maximum temperature difference value exceedes setting again, if so, calculates corresponding liquid cooling apparatus operating state, and sends result to liquid cooling apparatus control system;
Step 6-4, if not, circulation, from step 6-1.
Fig. 6 is 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 is crossed high threshold 1 < threshold value 2 < ... < threshold value N, circulatory mediator is imported and exported the corresponding liquid cooling apparatus of excessive temperature differentials threshold value 1 and is started, and circulatory mediator is imported and exported the corresponding liquid cooling apparatus of excessive temperature differentials threshold point N in the strongest operating state of heat radiation; It further comprises following step;
Step 7-1, comparison loop medium imports and exports circulatory mediator that whether temperature approach exceed setting is imported and exported excessive temperature differentials threshold point 1 and lower than threshold point 2, if so, calculate corresponding liquid cooling apparatus operating state, and send result of calculation to liquid cooling apparatus control system;
Step 7-2, if not, comparison loop medium is imported and exported the circulatory mediator whether temperature approach exceed setting and is imported and exported excessive temperature differentials threshold point N-1 and lower than battery excessive temperature differentials threshold point N, if, calculate corresponding liquid cooling apparatus operating state, and send result of calculation to liquid cooling apparatus control system;
Step 7-3, if not, comparison loop medium is imported and exported the excessive temperature differentials threshold point N whether temperature approach exceedes setting again, if so, calculates corresponding liquid cooling apparatus operating state, and sends result to liquid cooling apparatus control system;
Step 7-4, if not, circulation, from step 7-1.
In sum, it is battery operated in suitable temperature range that method of the present invention is that the operating state by controlling battery fluid cooling system ensures, and the operating state that the operating state of liquid cooling apparatus is the drive unit by circulatory mediator realizes.
Further the course of work and the operation principle of a kind of power lithium-ion battery liquid cooling temperature of the present invention control and management method are described below.
According to Fig. 1, in dynamical lithium-ion battery packs, formed the variations in temperature of multiple points and the variations in temperature of liquid cooling circulatory mediator of its modules by multiple temperature sensor tests, current sensor in output circuit can be monitored battery curent change in the course of the work simultaneously, holding wire sends the temperature data collecting and current data to battery management system, battery management system is by the data analysis comparison receiving, draw battery pack maximum temperature, the outlet temperature of minimum temperature and maximum temperature difference and circulatory mediator and the import and export temperature difference and operating current this moment, successively according to the large current work of electrokinetic cell, too high and the battery excessive temperature differentials of battery temperature, liquid cooling circulatory mediator outlet temperature temperature control and management method too high and import and export excessive temperature differentials calculates the operation state values of liquid cooling apparatus, the different operating state value relatively drawing, adopt the operation state values of specific heat load maximum, according to the drive unit of circulatory mediator in this parameter control liquid cooling apparatus, the working temperature of guaranteeing in time from many aspects electrokinetic cell can be not too high and heat is even.
Describe power lithium-ion battery liquid cooling temperature control and management method in detail, its marrow is five comprised decision processes, battery operated electric current whether the temperature temperature difference whether too high, battery in current state, battery excessive, whether 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 determined by the running status of vehicle.In the time of vehicle launch, acceleration and climbing or charging quickly, need electrokinetic cell to work under large electric current.From lithium ion battery characteristic, the temperature of the larger battery of operating current raises rapider, and rising temperature is higher.It is relatively to have certain hysteresis quality with directly operating state being set according to the variation of operating current that battery cooling system cooling arranges operating state according to the variation of battery temperature, and the latter can realize the effect of liquid cooling system more efficiently and effectively.
In the maximum current that can bear at electrokinetic cell as Fig. 2, set the threshold value 1,2 of the different large electric currents of work ... N, be large current threshold 2 < of large current threshold 1 < ... the large current threshold N of <, and the operating state that corresponding liquid cooling apparatus is different, wherein the corresponding liquid cooling apparatus of minimum large current threshold 1 starts, the highest large 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 exceedes the large current threshold point 1 of battery of setting and lower than threshold point 2, if so, calculates corresponding liquid cooling apparatus operating state, and send result of calculation to liquid cooling apparatus control system; If not, in like manner judge by different large current thresholds successively, and calculate corresponding liquid cooling apparatus operating state, send parameter to liquid cooling apparatus control system, thereby realize liquid cooling apparatus in best operating state.If judge that, to large current threshold N, circulation, starts again to judge from threshold value 1 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, at this moment can be by the work of suitable management liquid cooling apparatus, and carry out stable heat radiation guarantee battery and work in best effort interval.
As Fig. 3, between higher than electrokinetic cell optimum working temperature and the maximum operating temperature that allows lower than battery, set as required different battery temperatures and cross high threshold 1,2 ... N, be that battery temperature is crossed high threshold 1 < battery temperature and crossed high threshold 2 < ... < battery temperature is crossed high threshold N, and the operating state that corresponding liquid cooling apparatus is different, wherein the corresponding liquid cooling apparatus of minimum excess Temperature threshold value starts, and the corresponding liquid cooling apparatus of the highest temperature threshold point N is in the strongest operating state of heat radiation.Relatively whether battery maximum temperature value exceedes the too high threshold point 1 of battery temperature of setting and lower than the too high threshold point 2 of battery temperature, if so, calculates corresponding liquid cooling apparatus operating state, and send result of calculation to liquid cooling apparatus control system; If not, in like manner cross high threshold by different battery temperatures successively and judge, and calculate corresponding liquid cooling apparatus operating state, send parameter to liquid cooling apparatus control system, thereby realize the operating state that liquid cooling apparatus is suitable.If judge and cross high threshold N to battery temperature, circulation, starts again to judge from threshold value 1.
The 3rd decision process: whether the battery temperature difference is excessive
Electrokinetic cell system assembles to a hundreds of monomer battery core by tens.Electrokinetic cell temperature due to the characteristic battery surface of monomer battery core itself in vehicle operating process has certain distinctiveness.If this temperature difference is larger, can aggravate the inconsistency of each monomer battery core in battery pack, cause overall power battery pack hydraulic performance decline, decline to useful life.Therefore, need to be in the time that the battery temperature difference acquire a certain degree, the processing of lowering the temperature, the mobile meeting of circulatory mediator reduces this difference.
As Fig. 4, before battery temperature reaches maximum temperature difference, 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 the operating state that corresponding liquid cooling apparatus is different, wherein the corresponding liquid cooling apparatus of the excessive threshold point 1 of 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 exceedes the battery excessive temperature differentials threshold point 1 of setting and lower than battery excessive temperature differentials threshold point 2, if so, calculates corresponding liquid cooling apparatus operating state, and send result of calculation to liquid cooling apparatus control system; If not, in like manner, relatively whether battery maximum temperature difference value exceedes the next battery excessive temperature differentials threshold point of setting and lower than next battery excessive temperature differentials threshold point more successively, if, calculate corresponding liquid cooling apparatus operating state, and send result of calculation to liquid cooling apparatus control system.If judge that, to battery excessive temperature differentials threshold value N, circulation, starts again to judge from threshold value 1.
The 4th decision process: whether circulatory mediator outlet temperature is too high
The liquid cooling system of electrokinetic cell is taken the heat of battery operated middle generation out of battery pack system by flowing of circulatory mediator.Circulatory mediator, by carrying out exchange heat with battery pack, can raise in the circulatory mediator temperature in battery pack exit.Even if the temperature of circulatory mediator outlet is still lower than the highest optimum temperature of battery, if even if heat can not shed by cooling system, heat will constantly be accumulate to outside the operating temperature range that circulatory mediator temperature continues to be increased to battery fast.For avoiding the appearance of this situation, need to monitor and participate in controlling as one of parameter to circulatory mediator outlet temperature the work of liquid cooling system.
As Fig. 5, set the outlet temperature of circulatory mediator and cross high threshold 1,2 ... N, be that circulatory mediator outlet temperature is crossed high threshold 1 < circulatory mediator excess Temperature threshold value 2 < ... < circulatory mediator excess Temperature threshold value N, and the operating state that corresponding liquid cooling apparatus is different, the corresponding liquid cooling apparatus of maximum excess Temperature threshold point N is in the strongest operating state of heat radiation.Whether comparison loop media outlet temperature value exceedes the excess Temperature threshold point 1 of setting and lower than threshold point 2, if so, calculates corresponding liquid cooling apparatus operating state, and send result of calculation to liquid cooling apparatus control system; If not, in like manner, whether comparison loop media outlet temperature value exceedes the next excess Temperature threshold point of setting and lower than next excess Temperature threshold point more successively, if, calculate corresponding liquid cooling apparatus operating state, and send result of calculation to liquid cooling apparatus control system.If judge and cross high threshold N to circulatory mediator outlet temperature, circulation, starts again to judge from threshold value 1.
The 5th decision process: whether circulatory mediator is imported and exported the temperature difference excessive
The circulatory mediator of low temperature enters 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.In the time that the import and export temperature difference of circulatory mediator in battery pack is larger, can cause the monomer battery core temperature of circulatory mediator import department too low, and the monomer battery core excess Temperature in circulatory mediator exit.Temperature is obvious on the electrochemical reaction impact of battery, and the duration is longer, and the consistency of battery reduces, thereby causes cell integrated hydraulic performance decline.Therefore, need to monitor the out temperature of circulatory mediator, one of parameter using its temperature difference as liquid cooling system work, by adjusting the import and export temperature difference of liquid cooling system operating state reduction circulatory mediator.
As Fig. 6, set the import and export excessive temperature differentials threshold value 1,2 of circulatory mediator ... N, be that circulatory mediator is imported and exported excessive temperature differentials threshold value 1 < import and export excessive temperature differentials threshold value 2 < ... < imports and exports excessive temperature differentials threshold value N, and the operating state that corresponding liquid cooling apparatus is different, 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.Comparison loop medium is imported and exported temperature approach and whether is exceeded the excess Temperature threshold point 1 of setting and lower than threshold point 2, if so, calculate corresponding liquid cooling apparatus operating state, and send result of calculation to liquid cooling apparatus control system; If not, in like manner, comparison loop medium imports and exports whether temperature approach exceedes the next threshold point of setting and lower than next threshold point more successively, if, calculate corresponding liquid cooling apparatus operating state, and send result of calculation to liquid cooling apparatus control system.If judge to circulatory mediator and import and export excessive temperature differentials threshold value N, circulation, starts again to judge from threshold value 1.
Claims (6)
1. a power lithium-ion battery liquid cooling temperature control and management method, is characterized in that, the method comprises the steps:
Step 1, after temperature sensor and current sensor initialization, starts to carry out temperature acquisition, current acquisition, comprises;
Collected the working temperature of electrokinetic cell by the multiple temperature sensors in power battery pack surface, collect by the temperature sensor of the import and export in battery pack system in liquid cooling system the temperature that circulatory mediator is imported and exported in battery pack, 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, battery management system is analyzed the multiple battery operated temperature value collecting relatively to draw maximum temperature value, minimum temperature value and maximum temperature difference, liquid cooling system out temperature is calculated to circulatory mediator simultaneously and imports and exports the temperature difference;
Step 3, judges that according to the large current temperature control and management of electrokinetic cell work method whether electric current is larger, if so, calculates corresponding liquid cooling apparatus operating state [1]; Comprise: set different working current value 1,2 ... N, be working current value 1 < working current value 2 < ... < working current value N, and the operating state that corresponding liquid cooling apparatus is different, wherein the corresponding liquid cooling apparatus of working current value 1 starts, working current value 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;
Step 4, judges that according to the too high control and management method of temperature of powered cell whether battery temperature is too high, if so, calculates corresponding liquid cooling apparatus operating state [2]; Comprise and set the different too high values 1 of battery temperature, 2 ... N, be too high value 2 < of the too high value 1 < battery temperature of battery temperature ... the too high value of < battery temperature N, and the operating state that corresponding liquid cooling apparatus is different, wherein the corresponding liquid cooling apparatus of the too high value 1 of minimum battery temperature starts, and the corresponding liquid cooling apparatus of the too high value of the highest battery temperature N is in the strongest operating state of heat radiation;
Step 5, judges that according to electrokinetic cell excessive temperature differentials control and management method whether the battery temperature difference is excessive, if so, calculates corresponding liquid cooling apparatus operating state [3]; Comprise: set different battery excessive temperature differentials values 1,2 ... N, be battery excessive temperature differentials value 1 < battery excessive temperature differentials value 2 < ... < battery excessive temperature differentials value N, and the operating state that corresponding liquid cooling apparatus is different, wherein the corresponding liquid cooling apparatus of minimum battery excessive temperature differentials value starts, and the corresponding liquid cooling apparatus of maximum battery excessive temperature differentials value point N is in the strongest operating state of heat radiation;
Step 6, judges that according to electrokinetic cell liquid cooling circulatory mediator excess Temperature control and management method whether circulatory mediator is too high in battery pack outlet temperature, if so, calculates corresponding liquid cooling apparatus operating state [4]; Comprise: set the too high value 1 of different circulatory mediator outlet temperatures, 2 ... N, too high value 2 < of the too high value 1 < circulatory mediator outlet temperature of circulatory mediator outlet temperature ... the too high value of < circulatory mediator outlet temperature N, the corresponding liquid cooling apparatus of the too high value 1 of circulatory mediator outlet temperature starts, and the corresponding liquid cooling apparatus of the too high value of circulatory mediator outlet temperature N is in the strongest operating state of heat radiation;
Step 7, imports and exports excessive temperature differentials control and management method according to electrokinetic cell liquid cooling circulatory mediator and judges that whether circulatory mediator is excessive in the battery pack import and export temperature difference, if so, calculates corresponding liquid cooling apparatus operating state [5]; Comprise: set different circulatory mediators and import and export excessive temperature differentials value 1,2 ... N, circulatory mediator is imported and exported the too high value 1 < circulatory mediator of the temperature difference and is imported and exported too high value 2 < of the temperature difference ... < circulatory mediator is imported and exported the too high value of temperature difference N, circulatory mediator is imported and exported the corresponding liquid cooling apparatus of excessive temperature differentials value 1 and is started, and circulatory mediator is imported and exported the corresponding liquid cooling apparatus of excessive temperature differentials value point N in the strongest operating state of heat radiation;
Step 8, relatively calculates the operating state [1] that above-mentioned steps 3 to step 7 obtains, and [2], [3], [4], [5], draw the operating state that radiating effect is the strongest, and adopt 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 large current temperature control and management of electrokinetic cell work method further comprises following step;
Step 3-1, whether more battery operated electric current exceedes the working current value 1 of setting and lower than working current value 2, if so, calculates corresponding liquid cooling apparatus operating state, and send result of calculation to liquid cooling apparatus control system;
Step 3-2, if not, whether more battery operated electric current exceedes the working current value N-1 of setting and lower than working current value N, if so, calculates corresponding liquid cooling apparatus operating state, and send result of calculation to liquid cooling apparatus control system;
If not, whether more battery operated electric current exceedes the working current value N of setting again, if so, calculates corresponding liquid cooling apparatus operating state, and sends result to liquid cooling apparatus control system;
Step 3-4, if not, circulation, from step 3-1.
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 further comprises following step;
Step 4-1, relatively whether battery maximum temperature value exceedes the too high value 1 of battery temperature of setting and lower than the too high value 2 of battery temperature, if so, calculates corresponding liquid cooling apparatus operating state, and send result of calculation to liquid cooling apparatus control system;
Step 4-2, if not, relatively whether battery maximum temperature value exceedes the too high value N-1 of battery temperature of setting and lower than the too high value N of battery temperature, if, calculate corresponding liquid cooling apparatus operating state, and send result of calculation to liquid cooling apparatus control system;
Step 4-3, if not, the too high value N of battery temperature that relatively whether battery maximum temperature value exceedes setting again, if so, calculates corresponding liquid cooling apparatus operating state, and sends result to liquid cooling apparatus control system;
Step 4-4, if not, circulation, from step 4-1.
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 further comprises following step;
Step 5-1, relatively whether battery maximum temperature difference value exceedes the battery excessive temperature differentials value 1 of setting and lower than battery excessive temperature differentials value 2, if so, calculates corresponding liquid cooling apparatus operating state, and send result of calculation to liquid cooling apparatus control system;
Step 5-2, if not, relatively whether battery maximum temperature difference value exceedes the battery excessive temperature differentials value N-1 of setting and lower than battery excessive temperature differentials value N, if, calculate corresponding liquid cooling apparatus operating state, and send result of calculation to liquid cooling apparatus control system;
Step 5-3, if not, the battery excessive temperature differentials value N that relatively whether battery maximum temperature difference value exceedes setting again, if so, calculates corresponding liquid cooling apparatus operating state, and sends result to liquid cooling apparatus control system;
Step 5-4, if not, circulation, from step 5-1.
5. liquid cooling temperature control and management method as claimed in claim 1, is characterized in that: described step 6, and the control and management method of electrokinetic cell liquid cooling circulatory mediator excess Temperature further comprises following step;
Step 6-1, whether comparison loop media outlet temperature value exceedes the too high value 1 of circulatory mediator outlet temperature of setting and lower than value 2, if so, calculates corresponding liquid cooling apparatus operating state, and send result of calculation to liquid cooling apparatus control system;
Step 6-2, if not, whether comparison loop media outlet temperature value exceedes the too high value N-1 of circulatory mediator outlet temperature of setting and lower than value N, if so, calculates corresponding liquid cooling apparatus operating state, and send result of calculation to liquid cooling apparatus control system;
Step 6-3, if not, the battery excessive temperature differentials value N that relatively whether battery maximum temperature difference value exceedes setting again, if so, calculates corresponding liquid cooling apparatus operating state, and sends result to liquid cooling apparatus control system;
Step 6-4, if not, circulation, from step 6-1.
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 further comprises following step;
Step 7-1, comparison loop medium is imported and exported temperature approach and whether is exceeded the circulatory mediator import and export excessive temperature differentials value 1 of setting and lower than value 2, if so, calculate corresponding liquid cooling apparatus operating state, and send result of calculation to liquid cooling apparatus control system;
Step 7-2, if not, comparison loop medium is imported and exported the circulatory mediator whether temperature approach exceed setting and is imported and exported excessive temperature differentials value N-1 and lower than battery excessive temperature differentials value N, if, calculate corresponding liquid cooling apparatus operating state, and send result of calculation to liquid cooling apparatus control system;
Step 7-3, if not, comparison loop medium is imported and exported the excessive temperature differentials value N whether temperature approach exceedes setting again, if so, calculates corresponding liquid cooling apparatus operating state, and sends result to liquid cooling apparatus control system;
Step 7-4, if not, circulation, from step 7-1.
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| CN105552478B (en) * | 2016-01-15 | 2018-03-23 | 温州大学激光与光电智能制造研究院 | The design method of temperature of powered cell control system and corresponding control system |
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| JP6432561B2 (en) * | 2016-06-08 | 2018-12-05 | トヨタ自動車株式会社 | Fuel cell system |
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| CN106785137B (en) * | 2016-12-25 | 2019-03-08 | 惠州市亿能电子有限公司 | Battery modules automate thermal management algorithm |
| CN106785220B (en) * | 2017-01-23 | 2019-02-05 | 威马汽车科技集团有限公司 | A kind of battery pack temprature control method |
| CN109599632B (en) * | 2017-09-30 | 2020-11-20 | 比亚迪股份有限公司 | Temperature adjusting method and temperature adjusting system for vehicle-mounted battery |
| CN108376810B (en) * | 2018-02-12 | 2021-02-05 | 威马智慧出行科技（上海）有限公司 | Power battery thermal management method and system |
| CN109638384B (en) * | 2018-12-20 | 2021-10-26 | 电子科技大学 | Air-cooling heat dissipation system for battery pack and heat management method thereof |
| CN110137628B (en) * | 2019-05-06 | 2021-11-23 | 奇瑞商用车（安徽）有限公司 | Self-heating system and heating method for power battery |
| CN112702886B (en) * | 2019-10-22 | 2022-09-02 | 华为技术有限公司 | Liquid cooling heat dissipation system, heat dissipation control method and control chip |
| CN113809440B (en) * | 2020-06-11 | 2023-05-26 | 广汽埃安新能源汽车有限公司 | Control method and system for coolant flow of liquid-cooled power battery and automobile |
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