CN103904382B - Hybrid vehicle vehicle mounted dynamic battery cooling control method - Google Patents

Abstract

The invention discloses a kind of hybrid vehicle vehicle mounted dynamic battery cooling control method, first the present invention obtains the relevant parameter of the battery that battery management system sensor acquisition obtains, and calculates the caloric value in the battery unit interval by relevant parameter；According to the caloric value of battery, battery surface temperature, the temperature of battery bag inlet and outlet cooling air, based on heat transfer theory, calculate the theoretical heat exchange amount of battery surface unit interval；By battery bag into and out of air port cooling air temperature and theoretical heat exchange amount, obtain the cooling air quantity in the unit interval；By changing blower fan output signal so that blower fan output calculates cooling air quantity.The present invention has according to battery surface temperature changing trend, revises fan delivery in real time, it is ensured that battery temperature changes stable feature.

Description

Hybrid vehicle vehicle mounted dynamic battery cooling control method

Technical field

The present invention relates to automobile batteries safety control technology field, especially relate to a kind of energy-conservation effect The best, cooling effectiveness is high, is prevented effectively from undercooling, cooling deficiency and cools down delayed mixing Power vehicle vehicle mounted dynamic battery cooling control method.

Background technology

In hybrid vehicle running, electrokinetic cell carries out charge and discharge process at any time, During along with substantial amounts of heat amount, cause internal temperature of battery higher.The big inertia of temperature, The big characteristic postponed causes battery surface variations in temperature slow.At traditional electrokinetic cell cooling system In the control mode of system, blower fan is commonly used divides gear to control fan delivery based on battery surface temperature Mode.And the slowly varying of battery surface temperature is likely to result in current time blower fan cooling wind Amount deficiency, causes battery temperature persistently to raise.Until battery surface temperature reaches blower fan gear valve Blower fan just can be promoted during value point to enter next air quantity gear.Use and divide based on battery surface temperature Gear controls the mode of fan delivery, can cause excessive when small-power uses of electrokinetic cell equally Cooling.Such control system increases the energy expenditure of blower fan and the running noises of blower fan, makes Become the frequent fluctuation of battery temperature, even can deviate the Optimal Temperature scope of battery.

Current domestic power battery for hybrid electric vehicle cooling system is commonly used determines shelves control wind The mode of fan delivery.Generally blower fan is arranged to one or several fixing gear, different gears pair Should different air quantity.When battery temperature reaches the threshold temperature of different gear, blower fan exports this shelves The air quantity that position is corresponding.But, battery cooling system is usually present following shortcoming:

1. cooling system cooling is delayed

When the high-power use of battery, inside battery caloric value is very big, causes internal temperature fast Speed raises.And temperature and heat conduction have big inertia, the big characteristic postponed, and due to battery material The heat conductivility of material is poor, and the change causing battery hull-skin temperature is slow.Therefore according to battery table Surface temperature controls the mode of cooling blower, necessarily causes the delay of cooling system action.

2. cooling system can cause undercooling and the problem of cooling deficiency

Blower fan uses the mode of multiple-rank control, and the size of cooling air quantity only relies on battery surface temperature Determine.When blower fan is in little air quantity gear, if the high-power use of battery, quantity of heat production is more, Cause current time cooling deficiency, cause battery temperature persistently to raise, and quickly trigger next shelves The threshold temperature point of position.When blower fan is in Wind Volume gear, if battery small-power uses, Quantity of heat production is little, causes current time undercooling, rapid drop in temperature.Cool down not enough and cold The most excessively can cause battery temperature frequent fluctuation, even can deviate battery Optimal Temperature scope.

3. system cooling effectiveness is low, higher energy expenditure and running noises.

System can cause unnecessary blower fan energy expenditure when sub-cooled, increases blower fan fortune The noise of row.

Chinese patent mandate publication number: CN102420343A, authorizes publication date in April, 2012 18, disclose a kind of for motor vehicle battery cooling apparatus, including: it is separately mounted to isolation The battery in space and PE equipment；Air induction conduit, is configured to the air from vehicle interior Supply to described battery and described PE equipment respectively；Discharge tube, is configured to from institute State air induction conduit to flow through the air of described battery and be discharged into outside；PE discharge tube, will be from institute State air induction conduit to flow through the air of described PE equipment and be discharged into vehicle interior or outside；First Valve, is arranged on and is supplied to described battery and described PE equipment respectively from vehicle interior by air Described air induction conduit in；And second valve, in being arranged on described PE discharge tube and Regulation flows through described PE equipment and is discharged into the air of vehicle interior or outside.This invention exists Cooling system cooling is delayed, the deficiency that cooling effectiveness is low.

Summary of the invention

The goal of the invention of the present invention is to overcome cooling system of the prior art cooling delayed, Undercooling, cooling deficiency, cooling effectiveness are low, the deficiency that energy consumption is high and noise is big, it is provided that A kind of good energy-conserving effect, cooling effectiveness is high, is prevented effectively from undercooling, cooling deficiency and cooling Delayed hybrid vehicle vehicle mounted dynamic battery cooling control method.

To achieve these goals, the present invention is by the following technical solutions:

A kind of hybrid vehicle vehicle mounted dynamic battery cooling control method, comprises the steps:

(1-1) electrokinetic cell internal resistance test device is used to measure electrokinetic cell internal resistance R with battery temperature The data that state-of-charge parameter SOC (State of charge) of degree and battery changes, and Internal resistance of cell R, battery temperature and corresponding SOC data are stored in battery management system；

(1-2) battery management system is by electric current, voltage and temperature sensor measurement battery Operating current I (for just, charge position is born in electric discharge), the load voltage U of battery, battery bag enter Temperature T of air port cooling air_{F, in}Temperature T with battery bag air outlet cooling air_{F, out}, electricity Battery surface temperature T at interior m the test point of pond bag₁, T₂,..., T_m；

(1-3) battery management system is according to formula T_avr=(T₁+T₂+。。。+T_m)/m calculates m Meansigma methods T of individual measurement temperature_avr, calculate the maximum of T of temperature_max；And obtain the lotus of battery Electricity condition parameter SOC；

Battery management system, according to electric current I and voltage U, uses ampere-hour integration of the prior art Method with dynamic corrections calculates the SOC of battery；

(1-4) battery management system SOC according to battery and mean temperature T of battery_avr, The data of battery management system storage find and present battery SOC and mean temperature T_avrPhase Corresponding internal resistance of cell R；

(1-5) as battery maximum temperature T_maxMore than being set in advance in battery management system Temperature T_setTime, battery management system calculates cooling air quantity actual valueAnd control blower fan and press According to cooling air quantity actual valueAir-out:

(1-5-1) in battery management system, t is set₀, t₁, t₂... for arrange at equal intervals time Carve, t_iFor t₀, t₁, t₂... in any one moment, Δ t_i=t_i+1-t_i；

(1-5-2) as battery maximum temperature T_maxMore than being set in advance in battery management system Temperature T_setTime, battery management system is according to formulaCalculate t₀~ t₁Battery-heating amount in time period

(1-5-3) blower fan is at t₁Moment starts；

(1-5-4) battery management system is set in t_i～t_i+1In time, battery management system root According to formulaCalculate t_i～t_i+1Battery-heating amount in time period

According to the theoretical cooling air quantity of below equation calculating:

$q_{calc}^{{\mathrm{\Δt}}_i}=\frac{Q_{calc}^{{\mathrm{\Δt}}_i}}{\left({\mathrm{\ρ}}_f{c}_{p,f}\right)\left(T_{f,out}^{\left(t_i\right)}-T_{f,in}^{\left(t_i\right)}\right)},$

$Q_{calc}^{{\mathrm{\Δt}}_i}=Q_{heat}^{{\mathrm{\Δt}}_{i-1}}+Q_{heat}^{{\mathrm{\Δt}}_{i-2}}-{\∫}_{t_{i-1}}^{t_i}\left({\mathrm{\ρ}}_f{c}_{p,f}{q}_f^{\left(t\right)}\right)\[T{\left(t\right)}_{f,out}-T_{f,in}\left(t\right)\]dt$

Wherein, as i=1, theoretical cooling air quantity is:

$q_{calc}^{{\mathrm{\Δt}}_1}=\frac{Q_{calc}^{{\mathrm{\Δt}}_1}}{\left({\mathrm{\ρ}}_f{c}_{p,f}\right)\left(T_{f,out}^{\left(t_1\right)}-T_{f,in}^{\left(t_1\right)}\right)}$

$Q_{calc}^{{\mathrm{\Δt}}_1}=Q_{heat}^{{\mathrm{\Δt}}_0};$

Wherein, c_{P, f}For the mean specific heat of air, ρ_fFor the average density of air, c_{P, f}With ρ_fAir thermal physical property parameter for standard；For t_iThe battery in moment wraps into air at air port Temperature；For current time actual output cooling air quantity；For t_iTo t_i+1Electricity in time The comprehensive the quantity of heat convection of pool surface；For t_iTo t_i+1The heating of battery is calculated in time Amount；

(1-5-5) battery management system is according to formulaCalculate Δ t_iIn time Cooling air quantity actual valueBattery management system controls blower fan at t_iTo t_i+1In time Air output is

Wherein, k_cFor according to battery surface maximum temperature at Δ t_iThe wind that variable quantity in time obtains Quantity correction coefficient, its value is:

For t_iThe battery surface maximum temperature in moment,For t_i+1The battery surface in moment Maximum temperature；t₁The k in moment_cValue is 1；ΔT₁Air quantity for setting adjusts temperature threshold；

(1-6) as battery surface maximum temperature T_max≤T_set-ΔT₂Time, then battery management It is out of service that system controls blower fan, (T_set-ΔT₂) it is to control the threshold temperature that blower fan is out of service, ΔT₂For the T set_setThe difference of the threshold temperature out of service with controlling blower fan；

Otherwise proceed to step (1-5-4).

First the hybrid vehicle vehicle mounted dynamic battery cooling control method of the present invention obtains electricity The relevant parameter of the battery that pond management system sensor collects, calculates electricity by relevant parameter Caloric value in the unit interval of pond；According to the caloric value of battery, battery surface temperature, battery bag The temperature of inlet and outlet cooling air, based on heat transfer theory, calculates battery surface unit The theoretical heat exchange amount of time；By battery bag into and out of air port cooling air temperature and theoretical heat exchange Amount, obtains the cooling air quantity in the unit interval；By changing blower fan output signal so that blower fan Output calculates cooling air quantity；According to battery surface temperature changing trend, fan delivery is carried out reality Shi Xiuzheng, it is ensured that battery temperature change is steadily.

The present invention changes the required wind of heat Calculation electrokinetic cell cooling according to battery-heating amount and battery Amount, overcomes the problem that cooling is delayed, has control effect in advance.Consider calculating to determine Air quantity and the battery surface temperature of feedback, regulate cooling wind neatly by stepless time adjustment blower fan Amount, it is to avoid the problem of the temperature frequent fluctuation that undercooling and cooling deficiency cause, and make In the range of battery temperature maintains Optimal Temperature all the time, there is energy-conservation, noise reduction and cooling effectiveness is high Feature.

As preferably, described m is 3～5.

As preferably, described T_setIt it is 32～36 DEG C.

As preferably, described Δ t_iFor 2min～3min.

As preferably, b is 1.05～1.2, b₁It is 0.8～0.99.

As preferably, Δ T₁It it is 0.5～1 DEG C.

As preferably, Δ T₂It it is 2～4 DEG C.

Therefore, there is advantages that

1, cooling blower is determined by the caloric value in calculating cell operation and battery heat exchange amount Cooling air quantity, it is to avoid cooling system cooling is delayed, cool down not enough and supercooled problem, Improve the cooling effectiveness of cooling system.

2, obtain accurate cooling air quantity by stepless speed regulation type blower fan, and combine battery surface temperature Variation tendency carries out feedback modifiers to air quantity, it is to avoid the frequent fluctuation of battery temperature, even ripple The problem of the dynamic excessive battery actual motion temperature departure Optimal Temperature scope caused of amplitude.

3, by calculating air quantity and feedback temperature co-controlling cooling air quantity, it is ensured that battery is tieed up all the time Hold in optimum operating temperature range, reduce the running noises of blower fan energy expenditure and blower fan.

Accompanying drawing explanation

Fig. 1 is a kind of flow chart of embodiments of the invention.

Detailed description of the invention

The present invention will be further described with detailed description of the invention below in conjunction with the accompanying drawings.

Embodiment as shown in Figure 1 is a kind of hybrid vehicle vehicle mounted dynamic battery cooling control Method processed, comprises the steps:

Step 100, uses electrokinetic cell internal resistance test device to measure electrokinetic cell internal resistance R with battery The data that state-of-charge parameter SOC (State of charge) of temperature and battery changes, And internal resistance of cell R, battery temperature and corresponding SOC data are stored in battery management system In；

Step 200, battery management system is by electric current, voltage and temperature sensor measurement electricity The temperature of the operating current I in pond, the load voltage U of battery, battery bag air inlet cooling air T_{F, in}Temperature T with battery bag air outlet cooling air_{F, out}, in battery bag at m test point Battery surface temperature T₁, T₂,..., T_m；M=5 in the present embodiment；

Step 300, battery management system is according to formula T_avr=(T₁+T₂+。。。+T_m)/m calculates M meansigma methods T measuring temperature_avr, calculate the maximum of T of temperature_max；And obtain battery State-of-charge parameter SOC；Battery management system, according to electric current I and voltage U, uses existing skill Ampere-hour integration in art and the SOC of the method calculating battery of dynamic corrections；

Step 400, the battery management system SOC according to battery and mean temperature T of battery_avr, The data of battery management system storage find and present battery SOC and mean temperature T_avrPhase Corresponding internal resistance of cell R；

Step 500, as battery maximum temperature T_maxMore than being set in advance in battery management system Temperature T_setTime, battery management system calculates cooling air quantity actual valueAnd control blower fan According to cooling air quantity actual valueAir-out:

Step 501, sets t in battery management system₀, t₁, t₂... for arrange at equal intervals time Carve, t_iFor t₀, t₁, t₂... in any one moment, Δ t_i=t_i+1-t_i；Δ t in the present embodiment_i For 2min；

Step 502, as battery maximum temperature T_maxMore than being set in advance in battery management system Temperature T_setTime, it is contemplated that battery-heating amount is mainly Joule heat, according to Joule's law, electricity The caloric value in pond can be by equation φ=I²Rt is calculated, then battery management system is according to formulaCalculate t₀～t₁Battery-heating amount in time period

Step 503, blower fan is at t₁Moment starts；

Step 504, battery management system is set in t_i～t_i+1In time, battery management system root According to formulaCalculate t_i～t_i+1Battery-heating amount in time period

According to the theoretical cooling air quantity of below equation calculating:

$q_{calc}^{{\mathrm{\Δt}}_i}=\frac{Q_{calc}^{{\mathrm{\Δt}}_i}}{\left({\mathrm{\ρ}}_f{c}_{p,f}\right)\left(T_{f,out}^{\left(t_i\right)}-T_{f,in}^{\left(t_i\right)}\right)},$

$Q_{calc}^{{\mathrm{\Δt}}_i}=Q_{heat}^{{\mathrm{\Δt}}_{i-1}}+Q_{heat}^{{\mathrm{\Δt}}_{i-2}}-{\∫}_{t_{i-1}}^{t_i}\left({\mathrm{\ρ}}_f{c}_{p,f}{q}_f^{\left(t\right)}\right)\[T{\left(t\right)}_{f,out}-T_{f,in}\left(t\right)\]dt$

Wherein, as i=1, theoretical cooling air quantity is:

$q_{calc}^{{\mathrm{\Δt}}_1}=\frac{Q_{calc}^{{\mathrm{\Δt}}_1}}{\left({\mathrm{\ρ}}_f{c}_{p,f}\right)\left(T_{f,out}^{\left(t_1\right)}-T_{f,in}^{\left(t_1\right)}\right)}$

$Q_{calc}^{{\mathrm{\Δt}}_1}=Q_{heat}^{{\mathrm{\Δt}}_0};$

Wherein, c_{P, f}For the mean specific heat of air, ρ_fFor the average density of air, c_{P, f}With ρ_fAir thermal physical property parameter for standard；For t_iThe battery in moment wraps into air at air port Temperature；For current time actual output cooling air quantity；For t_iTo t_i+1Electricity in time The comprehensive the quantity of heat convection of pool surface；For t_iTo t_i+1The heating of battery is calculated in time Amount；

Step 505, battery management system is according to formulaCalculate Δ t_iIn time Cooling air quantity actual valueBattery management system controls blower fan at t_iTo t_i+1In time Air output is

Wherein, k_cFor according to battery surface maximum temperature at Δ t_iThe wind that variable quantity in time obtains Quantity correction coefficient, its value is:

For t_iThe battery surface maximum temperature in moment,For t_i+1The battery surface in moment Maximum temperature；t_iThe k in moment_cValue is 1；ΔT₁Air quantity for setting adjusts temperature threshold；

Step 600, as battery surface maximum temperature T_max≤T_set-ΔT₂Time, then cell tube It is out of service that reason system controls blower fan, (T_set-ΔT₂) it is to control the temperature valve that blower fan is out of service Value, Δ T₂For the T set_setThe difference of the threshold temperature out of service with controlling blower fan；

Otherwise proceed to step 504.

In the present embodiment, b is 1.2, b₁It is 0.9；ΔT₁It is 4 DEG C, Δ T₂It is 3 DEG C, T_set=36 DEG C.

Should be understood that the present embodiment is merely to illustrate the present invention rather than limits the model of the present invention Enclose.In addition, it is to be understood that after having read the content that the present invention lectures, those skilled in the art Can make various changes or modifications the present invention, these equivalent form of values fall within appended by the application equally Claims limited range.

Claims (7)

1. a hybrid vehicle vehicle mounted dynamic battery cooling control method, is characterized in that, comprises the steps:

(1-1) use electrokinetic cell internal resistance test device to measure the data that electrokinetic cell internal resistance R changes with state-of-charge parameter SOC of battery temperature and battery, and internal resistance of cell R, battery temperature and corresponding SOC data are stored in battery management system；

(1-2) battery management system is by electric current, voltage and the operating current I of temperature sensor measurement battery, the load voltage U of battery, temperature T of battery bag air inlet cooling air_{f , in}Temperature T with battery bag air outlet cooling air_{f , out}, battery surface temperature T at m test point in battery bag₁, T₂..., T_m；

(1-3) battery management system is according to formula T_avr=(T₁+T₂+…+T_m)/m calculates m meansigma methods T measuring temperature_avr, calculate the maximum of T of temperature_max；And obtain state-of-charge parameter SOC of battery；

(1-4) battery management system SOC according to battery and mean temperature T of battery_avr, find and present battery SOC and mean temperature T in the data of battery management system storage_avrCorresponding internal resistance of cell R；

(1-5) as battery maximum temperature T_maxMore than temperature T being set in advance in battery management system_setTime, battery management system calculates cooling air quantity actual valueAnd control blower fan according to cooling air quantity actual valueAir-out:

(1-5-1) in battery management system, t is set₀, t₁, t₂... for the moment arranged at equal intervals, t_iFor t₀, t₁, t₂... in any one moment, Δ t_i=t_i+1-t_i；

(1-5-2) as battery maximum temperature T_maxMore than temperature T being set in advance in battery management system_setTime, battery management system is according to formulaCalculate t₀～t₁Battery-heating amount in time period

(1-5-3) blower fan is at t₁Moment starts；

(1-5-4) battery management system is set in t_i～t_i+1In time, battery management system is according to formulaCalculate t_i～t_i+1Battery-heating amount in time period

According to the theoretical cooling air quantity of below equation calculating:

Wherein, as i=1, theoretical cooling air quantity is:

Wherein, c_{p , f}For the mean specific heat of air, ρ_fFor the average density of air, c_{p , f}And ρ_fAir thermal physical property parameter for standard；For t_iThe battery in moment wraps into air themperature at air port；For current time actual output cooling air quantity；For t_iTo t_i+1The comprehensive the quantity of heat convection of battery surface in time；For t_iTo t_i+1The caloric value of battery is calculated in time；

(1-5-5) battery management system is according to formulaCalculate Δ t_iCooling air quantity actual value in timeBattery management system controls blower fan at t_iTo t_i+1Air output in time is

Wherein, k_cFor according to battery surface maximum temperature at Δ t_iThe air quantity correction factor that variable quantity in time obtains, its value is:

For t_iThe battery surface maximum temperature in moment,For t_i+1The battery surface maximum temperature in moment；t₁The k in moment_cValue is 1；ΔT₁Air quantity for setting adjusts temperature threshold；

(1-6) as battery surface maximum temperature T_max≤T_set-ΔT₂Time, then battery management system control blower fan is out of service, (T_set-ΔT₂) it is to control the threshold temperature that blower fan is out of service, Δ T₂For the T set_setThe difference of the threshold temperature out of service with controlling blower fan；

Otherwise proceed to step (1-5-4).

Hybrid vehicle vehicle mounted dynamic battery cooling control method the most according to claim 1, is characterized in that, described m is 3～5.

Hybrid vehicle vehicle mounted dynamic battery cooling control method the most according to claim 1, is characterized in that, described T_setIt it is 32～36 DEG C.

Hybrid vehicle vehicle mounted dynamic battery cooling control method the most according to claim 1, is characterized in that, described Δ t_iFor 2min～3min.

5. according to the hybrid vehicle vehicle mounted dynamic battery cooling control method described in claim 1 or 2 or 3 or 4, it is characterized in that, b is 1.05～1.2, b₁It is 0.8～0.99.

6., according to the hybrid vehicle vehicle mounted dynamic battery cooling control method described in claim 1 or 2 or 3 or 4, it is characterized in that, Δ T₁It it is 0.5～1 DEG C.

7., according to the hybrid vehicle vehicle mounted dynamic battery cooling control method described in claim 1 or 2 or 3 or 4, it is characterized in that, Δ T₂It it is 2～4 DEG C.