CN105206897A - Method and device for controlling temperature of battery pack - Google Patents
Method and device for controlling temperature of battery pack Download PDFInfo
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- CN105206897A CN105206897A CN201410307971.0A CN201410307971A CN105206897A CN 105206897 A CN105206897 A CN 105206897A CN 201410307971 A CN201410307971 A CN 201410307971A CN 105206897 A CN105206897 A CN 105206897A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E60/10—Energy storage using batteries
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Abstract
The invention discloses a method and device for controlling temperature of a battery pack. The battery pack comprises a group of battery units which are connected in series. The device for controlling temperature of the battery pack is characterized by comprising a plurality of first series circuits, a temperature detecting unit, a temperature comparing unit and a battery managing unit, wherein each first series circuit comprises a first contactor and a first resistor which are connect in series; a plurality of battery units in the group of battery units are respectively connected with one first series circuit in parallel; the temperature detecting unit is used for detecting the temperature of the battery pack; the temperature comparing unit is used for comparing the detected temperature of the battery pack with a predetermined temperature threshold value to obtain a comparative result; the battery managing unit is used for controlling on-off of the first contactors according to the comparative result, when the temperature of the battery pack is less than the temperature threshold value, the battery managing unit controls to turn off one or more of the first contactors, and when the temperature of the battery pack is equal to or greater than the temperature threshold value, the battery managing unit controls to turn on the first contactors.
Description
Technical field
The present invention relates generally to vehicle electric field, relates more specifically to a kind of apparatus and method for controlling battery pack temperature.
Background technology
The battery used in vehicle, such as lithium battery, in certain temperature range, the marked change along with the change of temperature of its internal resistance.Lithium battery interior resistance reduces when the temperature increases, and the efficiency of lithium battery improves thereupon, and battery can in higher power level work.And when temperature is very low, lithium battery can not work at all.Therefore, when the temperature of lithium battery is too low, needs lithium battery to heat, could use in cold environment.
Usually, utilize the air cooling system of vehicle, by the air in use driver's cabin as the source of heating or cool, come to heat lithium battery.But this mode can only heat battery pack entirety, when only having percentage of batteries group to need heating, localized heating cannot be carried out to battery pack, the temperature that battery pack each several part reaches identical can not be made.In addition, when temperature is very low, damp and hot cabin air can cause steam to condense on cold battery component.If need to remove condensation, still need to heat battery pack from inside, need to provide extra heater block and provide the power supply of electric energy for heater block, make the structure of battery circuit more complicated, add cost.
Summary of the invention
In view of the above problems, propose the present invention, to provide a kind of apparatus and method controlling the temperature of battery pack, to overcome the problems referred to above or to solve the problem at least in part.
According to a first aspect of the present invention, provide a kind of device of the temperature for controlling battery pack, described battery pack comprises a Battery pack unit of series connection, it is characterized in that, described device comprises: several first series circuits, each of described first series circuit comprises the first contactor and the first resistance that are arranged in series, and each of several battery units in a described Battery pack unit is in parallel with one first series circuit respectively; Temperature detecting unit, for detecting the temperature of battery pack; Temperature comparing unit, for the temperature of described battery pack that will detect compared with predetermined temperature threshold, to obtain comparative result; And battery management unit, for controlling the closed and disconnected of the first contactor according to described comparative result, wherein when the temperature of described battery pack is less than described temperature threshold, it is one or more that battery management unit controls in closed first contactor described in several; When the temperature of described battery pack is equal to or greater than described temperature threshold, battery management unit controls to disconnect several first contactors described.
According to an embodiment of the present invention, wherein said battery management unit is used for: according to the temperature of described battery pack and the difference of described temperature threshold, determines the quantity of closed described first contactor.
According to an embodiment of the present invention, wherein said battery management unit is used for: when the temperature of described battery pack is less than described temperature threshold, and multiple within multiple time interval in turn in several first contactors closed described also disconnect the first contactor described in other.
According to an embodiment of the present invention, wherein said battery management unit is used for: when described battery pack temperature is less than described temperature threshold, multiple simultaneously in several first contactors closed described; And several battery units described in pulse-width modulation and the electric current between described first resistance in parallel with it.
According to an embodiment of the present invention, wherein: described battery pack is dispelled the heat by the air cooling system of described vehicle, and several first resistance described are arranged on the air intake place of described air cooling system.
According to an embodiment of the present invention, wherein: several first resistance described are configured to be evenly distributed in described battery pack.
According to an embodiment of the present invention, wherein: described battery pack is dispelled the heat by the liquid cooling system of described vehicle; And several first resistance described are set to be evenly distributed near described battery pack.
According to an embodiment of the present invention, wherein: described temperature detecting unit is also for detecting the regional temperature in several regions in battery pack; Described temperature comparing unit also for the described regional temperature that will detect respectively compared with predetermined temperature threshold, to obtain comparative result; And described battery management unit is also for according to described comparative result, when described regional temperature is less than described temperature threshold, control closed be positioned at or near this region at least one first resistance corresponding to the first contactor.
According to an embodiment of the present invention, wherein: described temperature detecting unit is also for detecting the temperature of each battery unit in battery pack; Described temperature comparing unit also for the temperature of described battery unit that will detect compared with predetermined temperature threshold, to obtain comparative result; And described battery management unit is also for according to described comparative result, when described battery cell temperature is less than described temperature threshold, control to close the first contactor near corresponding at least one first resistance of described battery unit.
According to an embodiment of the present invention, wherein said device also comprises several voltage measurement units, each of several voltage measurement units described is in parallel with each in several battery units described respectively, and described voltage measurement unit is used for the magnitude of voltage measuring each battery unit in batteries charging process; Described battery management unit also for determining the minimum value in described magnitude of voltage in batteries charging process; The magnitude of voltage of battery unit described in each is compared acquisition voltage difference with the minimum value in described magnitude of voltage; Described voltage difference is compared with the voltage difference threshold value preset; When the temperature of described battery pack be less than described default temperature threshold and exist voltage difference corresponding at least one battery unit be equal to or greater than described default voltage difference threshold value time, described battery management unit controls the first contactor corresponding to closed described at least one battery unit; When the temperature of described battery pack is less than described default temperature threshold and voltage difference corresponding to each battery unit is all less than described default voltage difference threshold value, described battery management unit controls described first contactor corresponding to each battery unit closed.
According to a second aspect of the invention, provide a kind of method of the temperature for controlling battery pack, described battery pack comprises a Battery pack unit of series connection, it is characterized in that, described method comprises: arrange several the first series circuits, each of described first series circuit comprises the first contactor and the first resistance that are arranged in series, and each in several battery units in a described Battery pack unit is in parallel with one first series circuit respectively; Detect the temperature of battery pack; By the temperature of described battery pack that detects compared with predetermined temperature threshold, to obtain comparative result; And the closed and disconnected of the first contactor is controlled according to described comparative result, wherein when the temperature of described battery pack is less than described temperature threshold, controlling closed pair should one or more in several first contactors of several battery units described; When the temperature of described battery pack is equal to or greater than described temperature threshold, control to disconnect several first contactors described.
According to an embodiment of the present invention, wherein, when the temperature of described battery pack is less than described temperature threshold, to control in several first contactors closed described one or more comprises further: according to the temperature of described battery pack and the difference of described temperature threshold, determine the quantity of closed described first contactor.
According to an embodiment of the present invention, wherein when the temperature of described battery pack is less than described temperature threshold, to control in several first contactors closed described one or more comprises: multiple within multiple time interval in turn in closed several first contactors described also disconnect other described first contactor.
According to an embodiment of the present invention, wherein when described battery pack temperature is less than described temperature threshold, to control in several first contactors closed described one or more comprises: multiple simultaneously in closed several first contactors described; And several battery units described in pulse-width modulation and the electric current between described first resistance of its parallel connection.
According to an embodiment of the present invention, wherein said battery pack is dispelled the heat by the air cooling system of described vehicle; And described method also comprises: the air intake place several first resistance corresponding to several battery units described being arranged on described air cooling system.
According to an embodiment of the present invention, wherein said method also comprises: several first resistance corresponding to several battery units described are evenly distributed in described battery pack.
According to an embodiment of the present invention, wherein said battery pack is dispelled the heat by the liquid cooling system of described vehicle; And described method also comprises: several first resistance corresponding to several battery units described are set to be evenly distributed near described battery pack.
According to an embodiment of the present invention, wherein said method also comprises: the regional temperature detecting several regions in battery pack; By the described regional temperature that detects respectively compared with predetermined temperature threshold, to obtain comparative result; And according to described comparative result, when described regional temperature is less than described temperature threshold, control closed be positioned at or near this region at least one first resistance corresponding to the first contactor.
According to an embodiment of the present invention, wherein said method also comprises: the temperature detecting each battery unit in battery pack; By the temperature of described battery unit that detects compared with predetermined temperature threshold, to obtain comparative result; And according to described comparative result, when described battery cell temperature is less than described temperature threshold, control to close the first contactor near corresponding at least one first resistance of described battery unit.
According to an embodiment of the present invention, wherein said method also comprises: the magnitude of voltage measuring each battery unit in batteries charging process; Determine the minimum value in described magnitude of voltage; The magnitude of voltage of battery unit described in each is compared acquisition voltage difference with the minimum value in described magnitude of voltage; Described voltage difference is compared with the voltage difference threshold value preset; And when the described temperature when described battery pack is less than described temperature threshold, to control in closed described first contactor described in several one or more comprises further: when the temperature of described battery pack be less than described temperature threshold and exist voltage difference corresponding at least one battery unit be equal to or greater than described default voltage difference threshold value time, control the first contactor that closed described at least one battery unit is corresponding; When the temperature of described battery pack is less than described default temperature threshold and voltage difference corresponding to each battery unit is all less than described default voltage difference threshold value, control described first contactor that each battery unit closed is corresponding.
In a word, the apparatus and method of the temperature for controlling battery pack that embodiments of the present invention provide, had both been applicable to the vehicle using air cooling system, were also applicable to the vehicle using liquid cooling system; The heat around each region of battery pack can be controlled respectively, respectively temperature is adjusted to each battery unit, the speed that battery pack heats up can be controlled simultaneously as required, heat is evenly distributed, to make all battery unit heating, there is identical temperature; The electric current in Vehicular battery circuit can be avoided significantly to change at short notice, thus guarantee that the curtage of battery circuit is stablized; The a large amount of amount of localized heat produced when can work to battery circuit manage; Do not need to introduce any extra parts, do not need to be set to the power supply that heater element is powered yet, simplify the structure of battery circuit, reduce cost.
Above-mentioned explanation is only the general introduction of technical solution of the present invention, in order to technological means of the present invention can be better understood, and can be implemented according to the content of specification, and can become apparent, below especially exemplified by the specific embodiment of the present invention to allow above and other objects of the present invention, feature and advantage.
Accompanying drawing explanation
By reading hereafter detailed description of the preferred embodiment, various other advantage and benefit will become cheer and bright for those of ordinary skill in the art.Accompanying drawing only for illustrating the object of preferred implementation, and does not think limitation of the present invention.And in whole accompanying drawing, represent identical parts by identical reference symbol.In the accompanying drawings:
Fig. 1 be according to an embodiment of the present invention in for controlling the schematic diagram of the device of the temperature of battery pack;
Fig. 2 be according to an embodiment of the present invention in the flow chart of method of the temperature for controlling battery pack.
Embodiment
Below with reference to accompanying drawings illustrative embodiments of the present disclosure is described in more detail.Although show illustrative embodiments of the present disclosure in accompanying drawing, however should be appreciated that can realize the disclosure in a variety of manners and not should limit by the execution mode of setting forth here.On the contrary, provide these execution modes to be in order to more thoroughly the disclosure can be understood, and complete for the scope of the present disclosure can be conveyed to those skilled in the art.But achieve the present invention although should be appreciated that those skilled in the art can dream up clearly not describe in this manual or record and be included in the various structures in spirit of the present invention, principle and scope.The all examples quoted from this specification and conditional language are all for the object illustrated and instruct, principle prior art contributed to help reader understanding inventor and concept, and should be understood to be not limited to these the specifically example of citation and conditions.In addition, in order to be illustrated more clearly in, the detailed description for known devices, circuit and method is eliminated, not obscure description of the invention.Should be understood that unless stated otherwise, the feature in each execution mode described herein can combine mutually.
In this manual, the function of each unit can realize by using specialized hardware or the hardware performing process that can combine with suitable software.Such hardware or specialized hardware can comprise application-specific integrated circuit (ASIC) (ASIC), various other circuit, various processors etc.When being realized by processor, this function can be provided by single application specific processor, single share processor or multiple independently processor (wherein some may be shared).In addition, processor should not be understood to specially to refer to can the hardware of executive software, but impliedly can comprise and be not limited to digital signal processor (DSP) hardware, be used for the read-only memory (ROM) of storing software, random access memory (RAM) and non-volatile memory apparatus.
According to a first aspect of the invention, provide a kind of device of the temperature for controlling battery pack, wherein said battery pack comprises a Battery pack unit of series connection, it is characterized in that, described device comprises: several first series circuits, each of described first series circuit comprises the first contactor and the first resistance that are arranged in series, and each in several battery units in a described Battery pack unit is in parallel with one first series circuit respectively; Temperature detecting unit, for detecting the temperature of battery pack; Temperature comparing unit, for the temperature of described battery pack that will detect compared with predetermined temperature threshold, to obtain comparative result; And battery management unit, for controlling the closed and disconnected of the first contactor according to described comparative result, wherein when the temperature of described battery pack is less than described temperature threshold, it is one or more that battery management unit controls in closed first contactor described in several; When the temperature of described battery pack is equal to or greater than described temperature threshold, battery management unit controls to disconnect several first contactors described.
According to the embodiment of the present invention, battery pack, as lithium battery group, is other parts of the high-pressure system to vehicle, as inverter or motor, and the power supply of power supply.Alternatively, battery pack can comprise multiple battery unit, and these battery units with various combined serial and/or can be connected in parallel, to provide required voltage and energy.Such as, battery pack can comprise multiple battery unit be connected in series, the battery that each battery unit also can comprise multiple series connection and/or be connected in parallel.In order to pack, install, the object such as safety management and control, these battery units can be set to independently module.Such as, one is had to the battery pack of the battery that 96 are connected in series, battery pack can be set to 12 battery modules be connected in series, each module comprises 8 battery units be connected in series.
The quantity of each parts cited by it will be understood by those skilled in the art that in exemplary execution mode of the present invention is only for illustrative purposes, and not should be understood to limitation of the present invention.In the present invention, each parts can have other quantity, and do not depart from scope of the present invention.
According to an illustrative embodiment of the invention, contactor can be the switch being switched on or off circuit by closed or disconnection, and can be A.C. contactor, also can be D.C. contactor.
According to the embodiment of the present invention, the first resistance can be the resistance in vehicle balance circuit.In balancing circuitry in vehicle, each battery unit in resistance and battery pack is connected in parallel respectively and is provided with contactor between resistance and battery unit.By closed or disconnection contactor, optionally by the energy of these resistance consumption battery units, with by cell discharge, heat can be produced simultaneously.Such as, by cell discharge the highest for charge level, its charge level to be reduced to the charge level of other battery units in battery pack, thus each battery unit in balancing battery group, make each battery unit all have close charged state, allow battery pack in optimum state work.
Fig. 1 shows a non-limiting and exemplary execution mode of the present invention.To should be appreciated that in Fig. 1 that the annexation of represented each unit is only example, those skilled in the art can adopt other annexation completely, as long as each unit also can realize function of the present invention under such annexation.
As shown in Figure 1, described battery pack comprises a Battery pack unit of series connection, such as, comprise a Battery pack unit of ten battery unit 101-110 of series connection.Device 100 can comprise several, as four the first series circuits, each of described first series circuit comprises the first contactor and the first resistance that are arranged in series, and such as, first series circuit shown in Fig. 1 comprises the first contactor 111 and the first resistance 121 be arranged in series.Each in several battery units in a described Battery pack unit, each in such as, four battery unit 101-104 in ten battery units, in parallel with one first series circuit respectively.Such as, battery unit 101 is in parallel with the first series circuit comprising the first contactor 111 and the first resistance 121 be arranged in series.Alternatively, this battery pack can have the battery unit of other quantity.Alternatively, a battery unit can only be had by the first contactor and the first resistor coupled in parallel in a described Battery pack unit.Alternatively, all batteries unit in a described Battery pack unit or the battery unit of other quantity are by the first respective contactor and the first respective resistor coupled in parallel.
As shown in Figure 1, described device 100 comprises four the first series circuits, and each first series circuit includes described first contactor and described first resistance, temperature detecting unit 130, temperature comparing unit 140 and battery management unit 150.
According to an illustrative embodiment of the invention, temperature detecting unit 130 is for detecting the temperature of battery pack.Alternatively, temperature detecting unit 130 can be one group of temperature sensor, is separately positioned in each battery unit, for detecting the temperature of each battery unit respectively.Alternatively, temperature detecting unit 130 can be a temperature sensor, for detecting the temperature of whole battery pack.
According to an illustrative embodiment of the invention, temperature comparing unit 140 is for the temperature T of described battery pack that detected by temperature detecting unit 130 and predetermined temperature threshold T
0compare, to obtain comparative result.Alternatively, predetermined temperature threshold T
0can be battery pack operating efficiency the highest time temperature.
According to an illustrative embodiment of the invention, battery management unit 150 for controlling the closed and disconnected of the first contactor according to described comparative result, wherein when the temperature T of described battery pack is less than described temperature threshold T
0time, it is one or more that battery management unit 150 controls in several first contactors closed described; When the temperature T of described battery pack is equal to or greater than described temperature threshold T
0time, battery management unit 150 controls to disconnect several first contactors described.Such as, the temperature T of the battery pack detected when temperature detecting unit 130 is less than temperature threshold T
0time, battery management unit 150 controls two in closed four the first contactor 111-114 as shown in Figure 1, as closed first contactor 112 and 113, then the first resistance 122 and 123 is electrically connected with battery unit 102 and 103 by the first contactor 112 and 113 respectively in parallel, first resistance 122 and 123 produces heat after being energized, thus heating battery group.The temperature T of the battery pack detected when temperature detecting unit 130 is equal to or greater than described temperature threshold T
0time, battery management unit 150 controls disconnection four the first contactor 111-114, then there is no electric current in the first resistance 121-124, no longer produce heat, thus the temperature T of battery pack is maintained temperature threshold or makes the temperature of battery pack be reduced to temperature threshold T gradually through heat radiation
0.Alternatively, resistance in vehicle in balancing circuitry can be used as the first resistance, do not need to introduce any extra parts and carry out heating battery unit, also not need to be set to heat the power supply that extra parts are powered, simplify the structure of battery circuit, reduce cost.
According to an illustrative embodiment of the invention, wherein said battery management unit 150 for: according to the temperature of described battery pack and the difference of described temperature threshold, determine the quantity of closed described first contactor.Alternatively, the temperature T of the battery pack detected when temperature detecting unit 130 is far below temperature threshold T
0time, first contactor of a greater number can be closed, thus battery pack is heated up quickly.Alternatively, the temperature T of the battery pack detected when temperature detecting unit 130 is only a little less than temperature threshold T
0time, the first contactor of lesser amt can be closed, thus battery pack is heated up lentamente.Such as, the temperature T of the battery pack detected when temperature detecting unit 130 and temperature threshold T
0difference DELTA T>=40 DEG C time, closed whole four the first contactor 111-114 as shown in Figure 1; The temperature T of the battery pack detected when temperature detecting unit 130 and temperature threshold T
0difference DELTA T between 25 ~ 40 DEG C time, three the first contactors in closed four the first contactors as shown in Figure 1, such as the first contactor 111,112 and 113; The temperature T of the battery pack detected when temperature detecting unit 130 and temperature threshold T
0difference DELTA T between 10 ~ 25 DEG C time, two the first contactors in closed four the first contactors as shown in Figure 1, such as the first contactor 112 and 113; The temperature T of the battery pack detected when temperature detecting unit 130 and temperature threshold T
0difference DELTA T≤10 DEG C time, first contactor only in closed four the first contactors as shown in Figure 1, such as the first contactor 113.Alternatively, the temperature T of the battery pack detected when temperature detecting unit 130 is equal to or greater than described temperature threshold T
0time, disconnect whole four the first contactors as shown in Figure 1.In this way, the a large amount of amount of localized heat produced when can work to battery circuit manage, and the heat that can control respectively around each region of battery pack, respectively temperature is adjusted to each battery unit, the speed that battery pack heats up can be controlled as required simultaneously, heat is evenly distributed, to make all battery unit heating, there is identical temperature;
According to an illustrative embodiment of the invention, described battery management unit 150 for: when the temperature of described battery pack is less than described temperature threshold, multiple within multiple time interval in turn in several first contactors closed described also disconnect the first contactor described in other.Alternatively, when the temperature T of described battery pack is less than described temperature threshold T
0time, by three the first contactors 111,113 and 114 in closed four the first contactor 111-114 as shown in Figure 1, first resistance 121,123 and 124 is electrically connected with battery unit 101,103 and 104 respectively, thus battery unit 101,103 and 104 is heated.Can within three time intervals, in turn close three the first contactors 111,113 and 114 and disconnect other the first contactors, such as in very first time interval, only close the first contactor 111 and disconnect other the first contactors, within second time interval, only close the first contactor 113 and disconnect other the first contactors, within the 3rd time interval, only close the first contactor 114 and disconnect other the first contactors.In this way, in another embodiment, closed first contactor 111,112 in very first time interval also disconnects other the first contactors, closed first contactor 113,114 within second time interval also disconnects other the first contactors, in this way, closing section first contactor within each time interval also opens other contactors, and the electric current in Vehicular battery circuit can be avoided significantly to change at short notice, thus guarantees that the curtage of battery circuit is stablized.
According to an illustrative embodiment of the invention, described battery management unit 150 for: when described battery pack temperature is less than described temperature threshold, multiple simultaneously in several first contactors closed described; And several battery units described in pulse-width modulation and the electric current between described first resistance in parallel with it.Alternatively, when the temperature T of described battery pack is less than described temperature threshold T
0time, by three the first contactors 111,113 and 114 in closed four the first contactor 111-114 as shown in Figure 1, first resistance 121,123 and 124 is electrically connected with battery unit 101,103 and 104 respectively, thus battery unit 101,103 and 104 is heated; Three the first contactors 111,113 and 114 can be closed, simultaneously pulse-width modulation battery unit 101,103 and 104 and first resistance 121 in parallel with it, electric current between 123 and 124 simultaneously.In this way, the electric current in Vehicular battery circuit can be avoided significantly to change at short notice, thus guarantee that the curtage of battery circuit is stablized.
According to an illustrative embodiment of the invention, described battery pack is dispelled the heat by the air cooling system of described vehicle, and several first resistance described are arranged on the air intake place of described air cooling system.Air in the air cooling system use driver's cabin of vehicle, as the source of heating or cool, comes battery pack heating or heat radiation.By several first resistance being arranged on the air intake place of described air cooling system, make air in driver's cabin through air intake place, be arranged on the first resistance heating of the air intake of described air cooling system, air after heating arrives fast and surrounds battery pack, heats battery pack.This mode, can be delivered to battery pack sooner, more uniformly by heat, and adds the contact area that battery pack participates in heat trnasfer, thus battery pack is heated up quickly.
According to an illustrative embodiment of the invention, several first resistance described are configured to be evenly distributed in described battery pack.Alternatively, as shown in Figure 1, the battery pack of device 100 comprises ten battery unit 101-110, wherein four battery unit 101-104 are in parallel with the first respective resistance 121-124 respectively by the first respective contactor 111-114, these four the first resistance 121-124 can be configured to be evenly distributed in battery pack, namely around battery unit 101-110.Such as, when the battery unit 101-110 in battery pack along a straight line successively equidistantly time, first resistance 121 is arranged between battery unit 102 and 103, first resistance 122 is arranged on battery unit 105 place, first resistance 123 is arranged between battery unit 107 and 108, first resistance 124 is arranged on battery unit 110 place, to make each several part homogeneous heating of battery pack.Alternatively, four the first resistance 121-124 can be set to a module, ten battery unit 101-110 are evenly distributed on this module for the center of circle circumferentially.Alternatively, ten battery unit 101-110 can be set to a module, four the first resistance 121-124 are evenly distributed on this module for the center of circle circumferentially.Alternatively, the first resistance can be arranged near battery pack, also can be set to distance battery pack one segment distance.
According to an illustrative embodiment of the invention, described battery pack is dispelled the heat by the liquid cooling system of described vehicle; And several first resistance described are set to be evenly distributed near described battery pack.As shown in Figure 1, the battery pack of device 100 comprises ten battery unit 101-110, wherein four battery unit 101-104 are in parallel with the first respective resistance 121-124 respectively by the first respective contactor 111-114, when battery pack is dispelled the heat by the liquid cooling system of described vehicle, these four the first resistance 121-124 can be set near described battery pack, and namely battery unit 101-110 is evenly distributed.Such as, when the battery unit 101-110 in battery pack along a straight line successively equidistantly time, first resistance 121 is set near battery unit 102 and 103, first resistance 122 is set near battery unit 105, first resistance 123 is set near battery unit 107 and 108, first resistance 124 is set near battery unit 110, to make heat can be directly delivered to battery pack from the first resistance, thus by each several part homogeneous heating of battery pack.Alternatively, four the first resistance 121-124 can be set to a module, ten battery unit 101-110 are uniformly distributed near this module.Alternatively, ten battery unit 101-110 can be set to a module, four the first resistance 121-124 are uniformly distributed near this module.
According to an illustrative embodiment of the invention, wherein: described temperature detecting unit is also for detecting the regional temperature in several regions in battery pack; Described temperature comparing unit also for the described regional temperature that will detect respectively compared with predetermined temperature threshold, to obtain comparative result; And described battery management unit is also for according to described comparative result, when described regional temperature is less than described temperature threshold, control closed be positioned at or near this region at least one first resistance corresponding to the first contactor.With reference to figure 1, when several first resistance described are configured to be evenly distributed in described battery pack or several first resistance described are set to be evenly distributed near described battery pack, such as, when the battery unit 101-110 in battery pack along a straight line successively equidistantly time, first resistance 121 is arranged between battery unit 102 and 103, first resistance 122 is arranged on battery unit 105 place, first resistance 123 is arranged between battery unit 107 and 108, first resistance 124 is arranged on battery unit 110 place, to make each several part homogeneous heating of battery pack.Temperature detecting unit 130 can detect the regional temperature in several regions in the battery pack shown in Fig. 1, such as, can detect the trizonal regional temperature T in battery unit 102,105 and 107 place
2, T
5and T
7, the described regional temperature T that temperature comparing unit 140 will detect
2, T
5and T
7respectively with temperature threshold T
0relatively, to obtain comparative result; Battery management unit 150 for according to this comparative result, when only there being the regional temperature T at battery unit 102 and 105 place
2and T
5be less than T
0, control to close the first contactor 111 near corresponding to the first resistance 121 of battery unit 102, and closed the first contactor 112 corresponding to the first resistance 122 being positioned at battery unit 105 place.
According to an illustrative embodiment of the invention, wherein: described temperature detecting unit is also for detecting the temperature of each battery unit in battery pack; Described temperature comparing unit also for the temperature of described battery unit that will detect compared with predetermined temperature threshold, to obtain comparative result; And described battery management unit is also for controlling the closed and disconnected of the first contactor according to described comparative result, wherein when described battery cell temperature is less than described temperature threshold, described battery management unit controls to close the first contactor near corresponding at least one first resistance of described battery unit.With reference to figure 1, when several first resistance described are configured to be evenly distributed in described battery pack or several first resistance described are set to be evenly distributed near described battery pack, such as, when the battery unit 101-110 in battery pack along a straight line successively equidistantly time, first resistance 121 is arranged between battery unit 102 and 103, first resistance 122 is arranged on battery unit 105 place, first resistance 123 is arranged between battery unit 107 and 108, first resistance 124 is arranged on battery unit 110 place, to make each several part homogeneous heating of battery pack.Temperature detecting unit 130 can detect the temperature T of each battery unit 101-110 in the battery pack shown in Fig. 1
1-T
10; The temperature T of described battery unit that temperature comparing unit 140 will detect
1-T
10with temperature threshold T
0relatively, to obtain comparative result; Battery management unit 150 controls the closed and disconnected of the first contactor according to this comparative result, when only there being the regional temperature T at battery unit 102 and 105 place
2and T
5be less than T
0, described battery management unit controls to close the first contactor 111 near corresponding to the first resistance 121 of battery unit 102, and closed the first contactor 112 corresponding to the first resistance 122 being positioned at battery unit 105 place.
According to an illustrative embodiment of the invention, described device 100 also comprises several voltage measurement units, each of several voltage measurement units described is in parallel with each in several battery units described respectively, and described voltage measurement unit is used for the magnitude of voltage measuring each battery unit in batteries charging process; Described battery management unit also for determining the minimum value in described magnitude of voltage in batteries charging process; The magnitude of voltage of battery unit described in each is compared acquisition voltage difference with the minimum value in described magnitude of voltage; Described voltage difference is compared with the voltage difference threshold value preset; When the temperature of described battery pack be less than described default temperature threshold and exist voltage difference corresponding at least one battery unit be equal to or greater than described default voltage difference threshold value time, described battery management unit controls the first contactor corresponding to closed described at least one battery unit; When the temperature of described battery pack is less than described default temperature threshold and voltage difference corresponding to each battery unit is all less than described default voltage difference threshold value, described first contactor that each battery unit closed is corresponding.
As shown in Figure 1, device 100 also can comprise four voltage measurement unit 161-164, each of these four voltage measurement units is in parallel with each in four battery unit 101-104 respectively, and voltage measurement unit 161-164 is used for the magnitude of voltage V measuring each battery unit in batteries charging process
1-V
4.Described battery management unit 150 also for determining magnitude of voltage V in batteries charging process
1-V
4in minimum value V
min, such as, if the magnitude of voltage V of battery unit 102
2v
1-V
4in minimum, then V
min=V
2; By the minimum value V in the magnitude of voltage of battery unit described in each and described magnitude of voltage
minrelatively obtain voltage difference, such as the voltage difference of battery unit 101-104 is respectively Δ V
1=V
1-V
min, Δ V
2=0, Δ V
3=V
3-V
min, Δ V
4=V
4-V
min; By described voltage difference and the voltage difference threshold value Δ V preset
0relatively; When the temperature T of described battery pack is less than described default temperature threshold T
0and there is voltage difference corresponding at least one battery unit when being equal to or greater than described default voltage difference threshold value, the voltage difference Δ V of such as battery unit 101 and 104
1with Δ V
4be equal to or greater than voltage difference threshold value Δ V
0then the first contactor 111 and 114 of battery management unit 150 closed electrical pool unit 101 and 104 correspondence, the first resistance 121 and 124 is made to produce heat with heating battery group, discharged by the first resistance 121 and the highest two battery units 101 and 104 of the 124 pairs of charge levels simultaneously, its charge level to be reduced to the charge level of other battery units in battery pack, thus each battery unit in balancing battery group, make each battery unit all have similar charged state, allow battery pack in optimum state work.When the temperature T of described battery pack is less than described default temperature threshold T
0and the voltage difference Δ V that each battery unit is corresponding
1-Δ V
4all be less than described default voltage difference threshold value V
0time, the first contactor 111-114 that closed each battery unit 101-104 is corresponding, four the first resistance 121-124 are made to produce heat with heating battery group, each of simultaneously battery unit 101-104 is discharged by the first respective resistance 121-124, then the voltage difference Δ V that each battery unit 101-104 is corresponding
1-Δ V
4will remain and be less than default voltage difference threshold value V
0, thus make each battery unit in battery pack still have similar charged state, allow battery pack in optimum state work.
As mentioned above, the invention discloses the device of the above-mentioned temperature for controlling battery pack, being both applicable to the vehicle using air cooling system, be also applicable to the vehicle using liquid cooling system; The heat around each region of battery pack can be controlled respectively, respectively temperature is adjusted to each battery unit, the speed that battery pack heats up can be controlled simultaneously as required, heat is evenly distributed, to make all battery unit heating, there is identical temperature; The electric current in Vehicular battery circuit can be avoided significantly to change at short notice, thus guarantee that the curtage of battery circuit is stablized; The a large amount of amount of localized heat produced when can work to battery circuit manage; Do not need to introduce any extra parts, do not need to be set to the power supply that heater element is powered yet, simplify the structure of battery circuit, reduce cost.
According to a second aspect of the invention, corresponding to as above according to the device for controlling battery pack temperature of the present invention, a kind of method 200 of the temperature for controlling battery pack is provided.According to the embodiment of the present invention, described battery pack comprises a Battery pack unit 101-110 of series connection.
Fig. 2 shows the flow chart of the method 200 of the temperature for controlling battery pack of a non-limiting and exemplary execution mode of the present invention.As shown in Figure 2, described method comprises: step S210: arrange several the first series circuits, each of described first series circuit comprises the first contactor and the first resistance that are arranged in series, and each in several battery units in a described Battery pack unit is in parallel with one first series circuit respectively; Step S220: the temperature detecting battery pack; Step S230 by the temperature T of described battery pack that detects compared with predetermined temperature threshold, to obtain comparative result; And step S240 controls the closed and disconnected of the first contactor according to described comparative result, wherein when the temperature of described battery pack is less than described temperature threshold, controlling closed pair should one or more in several first contactors of several battery units described; When the temperature of described battery pack is equal to or greater than described temperature threshold, control to disconnect several first contactors described.Alternatively, step S220 can be performed by the temperature detecting unit 130 in device 100.Alternatively, step S230 can be performed by the temperature comparing unit 140 in device 100.Alternatively, step S240 can be performed by the battery management unit 150 in device 100.
According to an illustrative embodiment of the invention, wherein when the temperature of described battery pack is less than described temperature threshold, to control in several first contactors closed described one or more comprises further: according to the temperature of described battery pack and the difference of described temperature threshold, determine the quantity of closed described first contactor.
According to an illustrative embodiment of the invention, wherein when the temperature of described battery pack is less than described temperature threshold, to control in several first contactors closed described one or more comprises: multiple within multiple time interval in turn in closed several first contactors described also disconnect other described first contactor.
According to an illustrative embodiment of the invention, wherein when described battery pack temperature is less than described temperature threshold, to control in several first contactors closed described one or more comprises: multiple simultaneously in closed several first contactors described; And several battery units described in pulse-width modulation and the electric current between described first resistance of its parallel connection.
According to an illustrative embodiment of the invention, wherein said battery pack is dispelled the heat by the air cooling system of described vehicle; And described method 200 also comprises: the air intake place several first resistance corresponding to several battery units described being arranged on described air cooling system.
According to an illustrative embodiment of the invention, wherein said method 200 also comprises: several first resistance corresponding to several battery units described are evenly distributed in described battery pack.
According to an illustrative embodiment of the invention, wherein said battery pack is dispelled the heat by the liquid cooling system of described vehicle; And described method 200 also comprises: several first resistance corresponding to several battery units described are set to be evenly distributed near described battery pack.
According to an illustrative embodiment of the invention, wherein said method 200 also comprises: the regional temperature detecting several regions in battery pack; By the described regional temperature that detects respectively compared with predetermined temperature threshold, to obtain comparative result; And according to described comparative result, when described regional temperature is less than described temperature threshold, control closed be positioned at or near this region at least one first resistance corresponding to the first contactor.
According to an illustrative embodiment of the invention, wherein said method 200 also comprises: the temperature detecting each battery unit in battery pack; By the temperature of described battery unit that detects compared with predetermined temperature threshold, to obtain comparative result; And the closed and disconnected of the first contactor is controlled according to described comparative result, wherein when described battery cell temperature is less than described temperature threshold, control to close the first contactor near corresponding at least one first resistance of described battery unit.
According to an illustrative embodiment of the invention, wherein said method 200 also comprises: the magnitude of voltage measuring each battery unit in batteries charging process; Determine the minimum value in described magnitude of voltage; The magnitude of voltage of battery unit described in each is compared acquisition voltage difference with the minimum value in described magnitude of voltage; Described voltage difference is compared with the voltage difference threshold value preset; And when the described temperature when described battery pack is less than described temperature threshold, to control in closed described first contactor described in several one or more comprises further: when the temperature of described battery pack be less than described temperature threshold and exist voltage difference corresponding at least one battery unit be equal to or greater than described default voltage difference threshold value time, control the first contactor that closed described at least one battery unit is corresponding; When the temperature of described battery pack is less than described default temperature threshold and voltage difference corresponding to each battery unit is all less than described default voltage difference threshold value, control described first contactor that each battery unit closed is corresponding.
Also can be applicable to, according to the method 200 for controlling battery pack temperature of the present invention, in order to concise and to the point object, not repeat them here to the foregoing description of the device 100 for controlling battery pack temperature.
As mentioned above, the invention discloses the method for the above-mentioned temperature for controlling battery pack, being both applicable to the vehicle using air cooling system, be also applicable to the vehicle using liquid cooling system; The heat around each region of battery pack can be controlled respectively, respectively temperature is adjusted to each battery unit, the speed that battery pack heats up can be controlled simultaneously as required, heat is evenly distributed, to make all battery unit heating, there is identical temperature; The electric current in Vehicular battery circuit can be avoided significantly to change at short notice, thus guarantee that the curtage of battery circuit is stablized; The a large amount of amount of localized heat produced when can work to battery circuit manage; Do not need to introduce any extra parts, do not need to be set to the power supply that heater element is powered yet, simplify the structure of battery circuit, reduce cost.
In this manual, a large amount of details is described.But, should be appreciated that embodiments of the present invention can be implemented when not having these details.In some embodiments, be not shown specifically known method, structure and technology, not make reader obscure the understanding of the principle to this specification.
It will be understood by those skilled in the art that and can the module in the device in each execution mode adaptively be changed, and they are arranged in one or more devices different from this execution mode.Except the situation that feature or process are mutually repelled, any combination can be adopted, to method any disclosed in this specification in steps or all modules of any device combine.Unless expressly stated otherwise, each feature disclosed in this specification can by providing identical, equivalent or similar object alternative features replaces.
The present invention will be described instead of limit the invention to it should be noted that above-mentioned execution mode, and those skilled in the art are not when departing from the scope of claims, can design various alternate embodiments.In detail in the claims, the sequence of feature does not also mean that any particular order of feature, and especially, in claim to a method each step order and do not mean that these steps must perform according to this order.On the contrary, these steps can perform with any order suitably.In detail in the claims, any reference marker being positioned at bracket should be understood as limitations on claims.Term " comprises " or " comprising " is not got rid of existence and do not arrange module in the claims or step.The term "a" or "an" be positioned at before module or step is not got rid of and be there is multiple such module or step.The use of term " first ", " second " and " the 3rd " etc. does not represent any order, can be title by these terminological interpretations.
Claims (20)
1., for controlling a device for the temperature of battery pack, described battery pack comprises a Battery pack unit of series connection, and it is characterized in that, described device comprises:
Several first series circuits, each of described first series circuit comprises the first contactor and the first resistance that are arranged in series, and each of several battery units in a described Battery pack unit is in parallel with one first series circuit respectively;
Temperature detecting unit, for detecting the temperature of battery pack;
Temperature comparing unit, for the temperature of described battery pack that will detect compared with predetermined temperature threshold, to obtain comparative result; And
Battery management unit, for controlling the closed and disconnected of the first contactor according to described comparative result, wherein when the temperature of described battery pack is less than described temperature threshold, it is one or more that battery management unit controls in closed first contactor described in several; When the temperature of described battery pack is equal to or greater than described temperature threshold, battery management unit controls to disconnect several first contactors described.
2. device as claimed in claim 1, wherein said battery management unit is used for:
According to the temperature of described battery pack and the difference of described temperature threshold, determine the quantity of closed described first contactor.
3. device as claimed in claim 1 or 2, wherein said battery management unit is used for:
When the temperature of described battery pack is less than described temperature threshold, multiple within multiple time interval in turn in several first contactors closed described also disconnect the first contactor described in other.
4. device as claimed in claim 1 or 2, wherein said battery management unit is used for:
When described battery pack temperature is less than described temperature threshold, multiple simultaneously in several first contactors closed described; And
Several battery units described in pulse-width modulation and the electric current between described first resistance in parallel with it.
5. device as claimed in claim 1 or 2, wherein:
Described battery pack is dispelled the heat by the air cooling system of described vehicle, and the first resistance described in several is arranged on the air intake place of described air cooling system.
6. device as claimed in claim 1, wherein:
First resistance described in several is configured to be evenly distributed in described battery pack.
7. device as claimed in claim 1, wherein:
Described battery pack is dispelled the heat by the liquid cooling system of described vehicle, and the first resistance described in several is configured to be evenly distributed near described battery pack.
8. as the device that claim 6 or 7 is stated, wherein:
Described temperature detecting unit is also for detecting the regional temperature in several regions in battery pack;
Described temperature comparing unit also for the described regional temperature that will detect respectively compared with predetermined temperature threshold, to obtain comparative result; And
Described battery management unit also for according to described comparative result, when described regional temperature is less than described temperature threshold, control closed be positioned at or near this region at least one first resistance corresponding to the first contactor.
9. as the device that claim 6 or 7 is stated, wherein:
Described temperature detecting unit is also for detecting the temperature of each battery unit in battery pack;
Described temperature comparing unit also for the temperature of described battery unit that will detect compared with predetermined temperature threshold, to obtain comparative result; And
Described battery management unit is also for controlling the closed and disconnected of the first contactor according to described comparative result, wherein when described battery cell temperature is less than described temperature threshold, described battery management unit controls to close the first contactor near corresponding at least one first resistance of described battery unit.
10. device as claimed in claim 1, wherein said device also comprises several voltage measurement units, each of several voltage measurement units described is in parallel with each in several battery units described respectively, and described voltage measurement unit is used for the magnitude of voltage measuring each battery unit in batteries charging process;
Described battery management unit also for determining the minimum value in described magnitude of voltage in batteries charging process; The magnitude of voltage of battery unit described in each is compared acquisition voltage difference with the minimum value in described magnitude of voltage; Described voltage difference is compared with the voltage difference threshold value preset; When the temperature of described battery pack be less than described default temperature threshold and exist voltage difference corresponding at least one battery unit be equal to or greater than described default voltage difference threshold value time, described battery management unit controls the first contactor corresponding to closed described at least one battery unit; When the temperature of described battery pack is less than described default temperature threshold and voltage difference corresponding to each battery unit is all less than described default voltage difference threshold value, described battery management unit controls described first contactor corresponding to each battery unit closed.
11. 1 kinds for controlling the method for the temperature of battery pack, described battery pack comprises a Battery pack unit of series connection, and it is characterized in that, described method comprises:
Arrange several the first series circuits, each of described first series circuit comprises the first contactor and the first resistance that are arranged in series, and each in several battery units in a described Battery pack unit is in parallel with one first series circuit respectively;
Detect the temperature of battery pack;
By the temperature of described battery pack that detects compared with predetermined temperature threshold, to obtain comparative result; And
Control the closed and disconnected of the first contactor according to described comparative result, wherein when the temperature of described battery pack is less than described temperature threshold, controlling closed pair should one or more in several first contactors of several battery units described; When the temperature of described battery pack is equal to or greater than described temperature threshold, control to disconnect several first contactors described.
12. methods as claimed in claim 11, wherein, when the temperature of described battery pack is less than described temperature threshold, to control in several first contactors closed described one or more comprises further:
According to the temperature of described battery pack and the difference of described temperature threshold, determine the quantity of closed described first contactor.
13. methods as described in claim 11 or 12, wherein when the temperature of described battery pack is less than described temperature threshold, to control in closed several first contactors described one or more comprises:
Multiple within multiple time interval in turn in several first contactors closed described also disconnect other described first contactor.
14. methods as described in claim 11 or 12, wherein when described battery pack temperature is less than described temperature threshold, to control in closed several first contactors described one or more comprises:
Multiple simultaneously in several first contactors closed described; And
Several battery units described in pulse-width modulation and the electric current between described first resistance of its parallel connection.
15. methods as described in claim 11 or 12, wherein said battery pack is dispelled the heat by the air cooling system of described vehicle; And described method also comprises:
Several first resistance corresponding to several battery units described are arranged on the air intake place of described air cooling system.
16. methods as claimed in claim 11, wherein said method also comprises:
Several first resistance corresponding to several battery units described are evenly distributed in described battery pack.
17. methods as claimed in claim 11, wherein said battery pack is dispelled the heat by the liquid cooling system of described vehicle; And described method also comprises:
Several first resistance corresponding to several battery units described are set to be evenly distributed near described battery pack.
18. methods as described in claim 16 or 17, wherein said method also comprises:
Detect the regional temperature in several regions in battery pack;
By the described regional temperature that detects respectively compared with predetermined temperature threshold, to obtain comparative result; And
According to described comparative result, when described regional temperature is less than described temperature threshold, control closed be positioned at or near this region at least one first resistance corresponding to the first contactor.
19. methods as described in claim 16 or 17, wherein said method also comprises:
Detect the temperature of each battery unit in battery pack;
By the temperature of described battery unit that detects compared with predetermined temperature threshold, to obtain comparative result; And
Control the closed and disconnected of the first contactor according to described comparative result, wherein when described battery cell temperature is less than described temperature threshold, control to close the first contactor near corresponding at least one first resistance of described battery unit.
20. methods as claimed in claim 11, wherein said method also comprises:
The magnitude of voltage of each battery unit is measured in batteries charging process;
Determine the minimum value in described magnitude of voltage;
The magnitude of voltage of battery unit described in each is compared acquisition voltage difference with the minimum value in described magnitude of voltage;
Described voltage difference is compared with the voltage difference threshold value preset; And
When the described temperature when described battery pack is less than described temperature threshold, one or more in closed described first contactor described in several comprise further: when the temperature of described battery pack be less than described temperature threshold and exist voltage difference corresponding at least one battery unit be equal to or greater than described default voltage difference threshold value time, control the first contactor that closed described at least one battery unit is corresponding; When the temperature of described battery pack is less than described default temperature threshold and voltage difference corresponding to each battery unit is all less than described default voltage difference threshold value, control described first contactor that each battery unit closed is corresponding.
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