CN111009703A - Heating control device and heating control method for battery - Google Patents
Heating control device and heating control method for battery Download PDFInfo
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- CN111009703A CN111009703A CN201911371421.4A CN201911371421A CN111009703A CN 111009703 A CN111009703 A CN 111009703A CN 201911371421 A CN201911371421 A CN 201911371421A CN 111009703 A CN111009703 A CN 111009703A
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 332
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000001514 detection method Methods 0.000 claims abstract description 88
- 238000004891 communication Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 5
- 230000002035 prolonged effect Effects 0.000 description 3
- 239000000284 extract Substances 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 230000008713 feedback mechanism Effects 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/615—Heating or keeping warm
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/617—Types of temperature control for achieving uniformity or desired distribution of temperature
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/63—Control systems
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/63—Control systems
- H01M10/635—Control systems based on ambient temperature
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Automation & Control Theory (AREA)
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Abstract
The invention discloses a heating control device and a heating control method of a battery, wherein the heating control device comprises at least three heating modules, the heating modules are arranged in one-to-one correspondence with electric core groups, and the heating modules heat electric cores in the corresponding electric core groups when being started; the temperature detection modules are arranged in one-to-one correspondence with the cell groups and detect the real-time temperature of the cells in the corresponding cell groups and generate temperature detection signals; the control module adjusts the opening state of the corresponding heating module through the first switch according to the temperature detection signal and the received external power supply signal, and adjusts the heating power of the corresponding heating module through the first switch according to the received temperature detection signal so that the temperature difference between the electric core group with the maximum temperature and the electric core group with the minimum temperature is smaller than or equal to a set difference. By the technical scheme, the consistency of the cell temperature is improved.
Description
Technical Field
The embodiment of the invention relates to the technical field of batteries, in particular to a heating control device and a heating control method of a battery.
Background
After the lithium iron phosphate battery is charged, the battery voltage immediately jumps to the full charging voltage at normal temperature, and the charging current is also very small, which easily causes the battery to be damaged and cannot be recovered.
For solving the above-mentioned problem, can heat the electric core of battery before charging to the battery at present, reach and allow to charge to the battery after the temperature of battery, traditional heating methods generally are for setting up heating device in the both sides of battery, but because the difference between the distance of heating device to different electric cores in the battery is great, lead to the uniformity of electric core temperature relatively poor, the maximum difference in temperature between the electric core can reach 25 ℃ even, lead to the battery to use after a period of time, the uniformity of voltage between the electric core is more and more poor, and the electric quantity of battery depends on the electric core that the voltage is minimum, and then lead to the available capacity of battery to reduce gradually, seriously influence the life of battery.
Disclosure of Invention
In view of this, embodiments of the present invention provide a heating control device and a heating control method for a battery, which avoid the problem that the battery is damaged and cannot be recovered due to charging the battery at a low temperature, improve the consistency of the cell temperature, and prolong the service life of the battery.
In a first aspect, an embodiment of the present invention provides a heating control device for a battery, where the battery includes a plurality of stacked electric cores, the electric cores are divided into at least three electric core groups, each electric core group includes a plurality of electric cores, and a difference between the number of electric cores in the electric core group including the largest number of electric cores and the number of electric cores in the electric core group including the smallest number of electric cores is less than or equal to 1;
the heating control device includes:
the heating modules are arranged in one-to-one correspondence with the cell groups and used for heating the corresponding cells in the cell groups when the cell groups are started;
the temperature detection modules are arranged in one-to-one correspondence with the cell groups and are used for detecting the real-time temperature of the cells in the corresponding cell groups and generating temperature detection signals;
the control module is used for adjusting the opening state of the corresponding heating module through the first switch according to the temperature detection signal and the received external power supply signal, and adjusting the heating power of the corresponding heating module through the first switch according to the received temperature detection signal so that the temperature difference between the electric core group with the maximum temperature and the electric core group with the minimum temperature is smaller than or equal to a set difference.
Further, the heating module and the battery core group are arranged at intervals along the stacking direction of the battery cores;
preferably, the heating module comprises a heating film.
Further, the control module comprises a heating power signal output end and a plurality of pulse adjusting signal output ends;
the control end of the first switch is electrically connected with the corresponding pulse adjusting signal output end, the first end of the first switch is electrically connected with the heating power supply signal output end, the second end of the first switch is electrically connected with the corresponding heating module, and the first switch is used for adjusting the communication time between the first end and the second end of the first switch according to the pulse adjusting signal received by the control end of the first switch so as to adjust the heating power of the corresponding heating module.
Further, the heating control device further includes:
and the control module is used for adjusting the opening state of the corresponding heating module through the first switch and the second switch according to the temperature detection signal and the received external power supply signal.
Furthermore, the control module comprises a switch control signal output end, a heating power supply signal output end and a plurality of pulse adjusting signal output ends;
the control end of the second switch is electrically connected with the switch control signal output end, and the first end of the second switch is electrically connected with the heating power supply signal output end;
the control end of the first switch is electrically connected with the corresponding pulse adjusting signal output end, the first ends of all the first switches are in short circuit and are electrically connected with the second ends of the second switches, the second ends of the first switches are electrically connected with the corresponding heating modules, and the first switches are used for adjusting the connection time between the first ends and the second ends of the first switches according to the pulse adjusting signals received by the control ends of the first switches so as to adjust the heating power of the corresponding heating modules.
Further, the heating control device further includes:
the current detection modules are arranged in one-to-one correspondence with the heating modules and are used for detecting real-time currents of the corresponding heating modules and generating current detection signals;
the control module is also used for adjusting the starting state of the heating module through a corresponding switch according to the received current detection signal;
preferably, the current detection module includes a hall sensor.
In a second aspect, an embodiment of the present invention further provides a heating control method for a battery, which is executed by the heating control device for a battery according to the first aspect, and the heating control method for a battery includes:
the temperature detection module detects the real-time temperature of the electric cores in the corresponding electric core group and generates a temperature detection signal;
the control module adjusts the starting state of the corresponding heating module through the first switch according to the temperature detection signal and the received external power supply signal;
the control module adjusts the heating power of the corresponding heating module through the first switch according to the received temperature detection signal, so that the temperature difference between the electric core group with the maximum temperature and the electric core group with the minimum temperature is smaller than or equal to a set difference.
Further, the step of adjusting, by the control module, the on state of the corresponding heating module through the first switch according to the temperature detection signal and the received external power signal includes:
the control module judges that the temperature of the electric core group with the lowest temperature is lower than a set temperature according to the temperature detection signal and controls all the heating modules to be started through the first switch when the received external power supply signal is an effective external power supply signal;
before the control module adjusts the heating power of the corresponding heating module through the first switch according to the received temperature detection signal, all the heating modules heat the corresponding electric core group at the maximum power.
Further, the step of adjusting, by the control module according to the received temperature detection signal, the heating power of the corresponding heating module through the first switch so that the temperature difference between the electric core group with the maximum temperature and the electric core group with the minimum temperature is less than or equal to a set difference includes:
the control module acquires the electric core group with the maximum temperature according to the received temperature detection signal;
the control module adjusts a pulse adjusting signal output to a first switch of the corresponding electric core group with the maximum temperature and reduces the heating power of the heating module corresponding to the electric core group with the maximum temperature to a first set heating power;
the control module acquires the electric core group with the maximum temperature again according to the received temperature detection signal every time at intervals;
if the electric core groups with the maximum temperature determined in the two previous and subsequent times are the same electric core group, the control module adjusts the pulse adjusting signal output to the first switch corresponding to the electric core group with the maximum temperature and reduces the heating power of the heating module corresponding to the electric core group with the maximum temperature to a second set heating power; wherein the second set heating power is less than the first set heating power;
if the electric core group with the maximum temperature determined in the previous and subsequent two times is different, the control module adjusts the pulse adjusting signal output to the first switch corresponding to the electric core group with the maximum current temperature, reduces the heating power of the heating module corresponding to the electric core group with the maximum temperature to a first set heating power, and restores the heating power of the heating module reduced in the previous time to the maximum heating power.
Further, the step of adjusting, by the control module, the corresponding on state of the heating module through the first switch according to the temperature detection signal and the received external power signal further includes:
when the control module judges that the temperature of the electric core group with the lowest temperature is greater than or equal to a set temperature according to the temperature detection signal, all the heating modules are controlled to be closed through corresponding switches; alternatively, the first and second electrodes may be,
and when the control module judges that the battery supplies power to the heating modules according to the received external power supply signal, the control module controls all the heating modules to be closed through corresponding switches.
The embodiment of the invention provides a heating control device and a heating control method of a battery, wherein a control module is used for adjusting the starting state of a corresponding heating module through a first switch according to a temperature detection signal fed back by a temperature detection module and a received external power supply signal, so that the battery can be charged only when the temperature reaches the chargeable temperature of the battery, the use limit of the battery in the original low-temperature environment is greatly reduced, the battery can be applied to the more extreme working condition environment, the application range of the battery is expanded, and the problems that the battery is damaged and cannot be recovered due to the charging of the battery at low temperature are solved. In addition, control module still is used for adjusting the heating power of the heating module that corresponds through first switch according to the received temperature detected signal, until the temperature difference between the electric core group that the temperature is the biggest and the electric core group that the temperature is the minimum is less than and sets for the difference, according to the real-time temperature of the different electric core groups of feedback constantly adjusts the heating power of the heating module that corresponds, finally make the temperature of all electric cores in the battery close, electric core temperature's uniformity has been promoted greatly, and then optimized the uniformity of voltage between the electric core, the speed of battery decay has been slowed down, the life of battery has been prolonged.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the background art of the present invention, the drawings needed to be used in the description of the embodiments or the background art will be briefly introduced below, and it is obvious that the drawings in the following description are schematic diagrams of some embodiments of the present invention, and for those skilled in the art, other solutions can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a heating control device for a battery according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another heating control device for a battery according to an embodiment of the present invention;
fig. 3 is a schematic flow chart of a method for controlling heating of a battery according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures. Throughout this specification, the same or similar reference numbers refer to the same or similar structures, elements, or processes. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
Fig. 1 is a schematic structural diagram of a heating control device for a battery according to an embodiment of the present invention. As shown in fig. 1, the battery includes a plurality of electric cores 1 arranged in a stacked manner, the electric cores 1 are divided into at least three electric core groups 2, each electric core group 2 includes a plurality of electric cores 1, the difference between the electric core group 2 containing the most electric cores 1 and the electric core group 2 containing the least electric cores 1 is less than or equal to 1, the heating control device includes at least three heating modules 3, the heating modules 3 are arranged in one-to-one correspondence with the electric core groups 2, and the heating modules 3 are used for heating the electric cores 1 in the corresponding electric core groups 2 when being opened.
That is, when the number of the electric cores 1 corresponds to the number of the heating modules 3, the number of the electric cores 1 included in all the electric core groups 2 is equal, that is, the difference between the numbers of the electric cores 1 in any electric core group 2 is equal to zero. When the number of the electric cores 1 is not equal to the number of the heating modules 3, the electric cores 1 may be divided into a plurality of electric core groups 2 in a manner of optimizing uniformity, so that the difference between the electric core group 2 with the largest number of the electric cores 1 and the electric core group 2 with the smallest number of the electric cores 1 is equal to 1.
Fig. 1 exemplarily shows that the battery includes thirteen electric cores 1, the heating control device includes four heating modules 3, that is, the number of the electric cores 1 corresponds to the number of the heating modules 3, which cannot be equally divided, and then the battery can be divided into four electric core groups 2, the heating modules 3 are disposed in one-to-one correspondence with the electric core groups 2, three electric core groups 2 among them can be disposed to include three electric cores 1, one electric core group 2 includes a fourth electric core 1, and the electric core group 2 including four electric cores 1 can be, for example, a third electric core group 2 along the stacking direction.
For example, as shown in fig. 1, the heating module 3 may be provided to include a heating film, the heating module 3 and the electric core assembly 2 are arranged at intervals along the stacking direction of the electric core 1, and in order to form a one-to-one correspondence relationship between the heating module 3 and the electric core assembly 2, fig. 1 exemplarily provides a stacking direction of the electric core 1, the heating module 3 is located below the electric core assembly 2 corresponding to the heating module 3, that is, the heating module 3 is considered to heat the electric core assembly 2 above the electric core assembly and arranged in contact with the heating module 3 when being turned on, and the heating module 3 may also be located above the electric core assembly 2 corresponding to the electric core assembly 3, that is, the heating module 3 is considered to heat the electric core assembly 2 below the electric core assembly and arranged in contact with the heating module 3 when being turned on.
As shown in fig. 1, the heating control device further includes at least three temperature detection modules, the temperature detection modules are arranged in one-to-one correspondence with the electric core groups 2, and the temperature detection modules are used for detecting the real-time temperature of the electric cores 1 in the corresponding electric core groups 2 and generating temperature detection signals. Specifically, the temperature detection module sets up with electric core group 2 one-to-one, and temperature detection module corresponds every electric core group 2 homoenergetic and obtains a temperature-detecting value, and the temperature-detecting value that the temperature detection module acquiescence detected is every electric core 1's in the electric core group 2 that corresponds temperature, can be in order to think that all electric core 1's in the same electric core group 2 temperature is the same in order to carry out follow-up algorithm operation. It should be noted that, in the embodiment of the present invention, the relative position relationship between the temperature detection module and the corresponding electric core assembly 2 is not limited, and it is only required to ensure that the temperature detection module can detect the temperature of the corresponding electric core assembly 2, for example, the temperature detection module may be disposed corresponding to the position of the heating film.
The heating control device further comprises a control module 5 and a first switch 6, wherein the first switch 6 is arranged corresponding to each heating module 3, and the control module 5 is used for adjusting the opening state of the corresponding heating module 3 through the first switch 6 according to a temperature detection signal fed back by the temperature detection module and a received external power supply signal. Specifically, the different temperature detected signal of temperature detect module feedback includes the temperature of the corresponding electric core group 2, control module 5 then can be according to temperature detected signal to different electric core group 2 according to the temperature sort, and then determine which electric core group 2 is the electric core group 2 that the temperature is the lowest, judge whether the temperature of the electric core group 2 that the temperature is the lowest is less than the settlement temperature, the settlement temperature for example can be zero degree, and simultaneously, control module 5 is effective external power source signal according to received external power source signal, battery and heating module 3 all need the external power source power supply, when external power source signal is effective external power source signal, control module 5 can judge that external power source can provide sufficient electric energy for battery and heating module 3 this moment. In summary, when the control module 5 determines that the temperature of the electric core assembly 2 with the lowest temperature is less than the set temperature, for example, zero degree, and determines that the external power signal is the effective external power signal, the first switch 6 controls all the heating modules 3 to be turned on, that is, controls all the heating modules 3 to be turned on, and the heating modules 3 heat the corresponding electric core assembly 2.
For example, before the temperature difference control strategy is not started, the control module 5 may control all the heating modules 3 to heat the corresponding cell group 2 at the maximum power through the first switch 6, so that the cell group 2 can be raised to the set temperature at the fastest speed, for example, zero degrees, in preparation for entering the temperature difference control process.
The control module 5 is further configured to adjust the heating power of the corresponding heating module 3 through the first switch 6 according to the received temperature detection signal, so that the temperature difference between the electric core group 2 with the maximum temperature and the electric core group 2 with the minimum temperature is smaller than or equal to a set difference, where the set difference may be, for example, zero or a value close to zero, that is, the control module 5 adjusts the power of the corresponding heating module 3, so that the temperatures of all the electric core groups 2 are finally the same, or the temperatures of all the electric core groups 2 are close.
Illustratively, the control module 5 may be configured to obtain the electric core assembly 2 with the maximum temperature according to the received temperature detection signal, the control module 5 adjusts the pulse adjustment signal output to the first switch 6 corresponding to the electric core assembly 2 with the maximum temperature and reduces the heating power of the heating module 3 corresponding to the electric core assembly 2 with the maximum temperature to the first set heating power, and the control module 5 obtains the electric core assembly 2 with the maximum temperature again according to the received temperature detection signal at intervals of the set time.
If the two electric core groups 2 with the maximum temperature determined at the previous time and the next time are the same electric core group 2, the control module 5 adjusts the pulse adjusting signal output to the first switch 6 corresponding to the electric core group 2 with the maximum temperature and reduces the heating power of the heating module 3 corresponding to the electric core group 2 with the maximum temperature to the second set heating power, and the second set heating power is smaller than the first set heating power. If the electric core groups 2 with the maximum temperature determined twice are different electric core groups 2, the control module 5 adjusts the pulse adjusting signal output to the first switch 6 corresponding to the electric core group 2 with the maximum current temperature and reduces the heating power of the heating module 3 corresponding to the electric core group 2 with the maximum temperature to the first set heating power, and recovers the heating power of the heating module 3 reduced last time to the maximum heating power.
Illustratively, the pulse adjusting signal may be a PWM (pulse width modulation) signal, that is, the control module 5 obtains the temperature of each electric core group 2 through the temperature detecting module, and determines which electric core group 2 is the highest temperature electric core group 2, and determines the heating module 3 corresponding to the electric core group 2, and adjusts the on-time ratio of the first switch 6 by adjusting the pulse adjusting signal output to the corresponding first switch 6, that is, the PWM signal, so as to reduce the heating power of the heating module 3 corresponding to the electric core group 2 with the highest temperature to the first set heating power, for example, reduce the heating power to 50% of the original heating power. After the interval of set time, for example, 3 minutes, the control module 5 obtains the temperature of each electric core group 2 again through the temperature detection module, determines which electric core group 2 is the highest temperature electric core group 2 at the current moment, and determines the heating module 3 corresponding to the electric core group 2.
If the two determined electric core groups 2 with the maximum temperature are the same electric core group 2, the control module 5 continuously adjusts the on-time ratio of the first switch 6 by adjusting the pulse adjusting signal output to the corresponding first switch 6, that is, the PWM signal, and further reduces the heating power of the heating module 3 corresponding to the electric core group 2 with the maximum temperature to a second set heating power, for example, reduces the heating power to 50% of the original heating power and then further reduces the heating power to 50%, and the rest heating modules 3 always maintain the maximum heating power in the process.
If the two heating core groups 2 with the maximum temperature determined at the previous time and the next time are different heating core groups 2, the control module 5 determines the heating module 3 corresponding to the heating core group 2 with the maximum temperature, adjusts the on-time ratio of the first switch 6 by adjusting the pulse adjusting signal, i.e. the PWM signal, output to the corresponding first switch 6, and further reduces the heating power of the heating module 3 corresponding to the heating core group 2 with the maximum temperature to the first set heating power, e.g. reduces the heating power to 50% of the original heating power, and adjusts the power of the heating module 3 corresponding to the heating module 3 with the previous heating power reduced to the first set heating power to the maximum heating power by adjusting the pulse adjusting signal, i.e. the PWM signal, output to the corresponding first switch 6. And repeating the steps until the control module 5 judges that the temperature difference value between the electric core group 2 with the maximum temperature and the electric core group 2 with the minimum temperature is less than or equal to a set difference value according to the received temperature detection signal, and finishing the temperature difference control process.
Like this, be favorable to utilizing heating module 3 to heat electric core 1 in the battery when the temperature is lower, just begin to charge the battery when the temperature reaches the battery chargeable temperature, make the battery can reduce greatly in the restriction of use under original low temperature environment, the battery can be used in more extreme operating mode environment, the battery range of application enlarges, when having avoided the problem that the battery that charges to the battery and lead to under the low temperature damages and can't resume, utilize the temperature feedback mechanism, the heating power of the heating module 3 that corresponds is constantly adjusted according to the real-time temperature of the different electric core group 2 of feedback, finally make the temperature of all electric core 1 in the battery close, the uniformity of core temperature has been promoted greatly, and then the uniformity of voltage between electric core 1 has been optimized, the speed of battery decay has been slowed down, the life of battery has been prolonged.
In addition, for every electric core 1 in corresponding battery all sets up corresponding first switch 6, heating module 3 and temperature detecting module, set up first switch 6, heating module 3 and temperature detecting module and all set up with electric core group 2 one-to-one, every electric core group 2 includes a plurality of electric cores 1, when realizing above-mentioned beneficial effect, be favorable to reducing first switch 6, the quantity of heating module 3 and temperature detecting module, reduce the heating control device's of battery cost.
Alternatively, as shown in fig. 1, the control module 5 may be configured to include a heating power signal output terminal a1 and a plurality of pulse adjustment signal output terminals a2, the control terminal b1 of the first switch 6 is electrically connected to the corresponding pulse adjustment signal output terminal a2, the first terminal b2 of the first switch 6 is electrically connected to the heating power signal output terminal a1, the second terminal b3 of the first switch 6 is electrically connected to the corresponding heating module 3, and the first switch 6 is configured to adjust the connection time between the first terminal b2 and the second terminal b3 thereof according to the pulse adjustment signal received by the control terminal b1 thereof to adjust the heating power of the corresponding heating module 3.
For example, the first switch 6 may be a MOS transistor, a gate of the MOS transistor is a control end b1 of the first switch 6, a source of the MOS transistor is a first end b2 of the first switch 6, a drain of the MOS transistor is a second end b3 of the first switch 6, the control module 5 outputs a pulse adjustment signal, that is, a PWM signal, to the control end b1 of the first switch 6 through a pulse adjustment signal output end a2, the first switch 6 is connected or disconnected between a first end b2 and a second end b3 thereof corresponding to a high-low level period in the received pulse adjustment signal, when the first end b2 and the second end b3 are connected, the control module 5 outputs a heating power supply signal to the corresponding heating module 3 through a heating power supply signal output end a1, and controls a connection time ratio between the first end b2 and the second end b3 of the first switch 6, thereby adjusting the heating power of the corresponding heating module 3.
Fig. 2 is a schematic structural diagram of another heating control device for a battery according to an embodiment of the present invention. On the basis of the heating control device with the structure shown in fig. 1, the heating control device shown in fig. 2 further includes a second switch 7, the control module 5 is configured to adjust the on-state of the corresponding heating module 3 through the first switch 6 and the second switch 7 according to the temperature detection signal and the received external power signal, referring to the above-mentioned embodiment, that is, the control module 5 wants to control whether the heating module 3 is on, and needs to control the first switch 6 and the second switch 7 at the same time, and when the first switch 6 and the second switch 7 are both turned on, the heating module 3 is turned on to heat the corresponding electric core pack 2.
Alternatively, as shown in fig. 2, the control module 5 may be configured to include a switch control signal output terminal A3, a heating power signal output terminal a1, and a plurality of pulse adjustment signal output terminals a2, the control terminal b1 of the second switch 7 is electrically connected to the switch control signal output terminal A3, the first terminal b2 of the second switch 7 is electrically connected to the heating power signal output terminal a1, the control terminal b1 of the first switch 6 is electrically connected to the corresponding pulse adjustment signal output terminal a2, the first terminals b2 of all the first switches 6 are shorted and electrically connected to the second terminal b3 of the second switch 7, the second terminal b3 of the first switch 6 is electrically connected to the corresponding heating module 3, and the first switch 6 is configured to adjust the connection time between the first terminal b2 and the second terminal b3 thereof according to the pulse adjustment signal received by the control terminal b1 thereof to adjust the heating power of the corresponding heating module 3.
For example, the first switch 6 and the second switch 7 may be MOS transistors, the gate of the MOS transistor is the control end b1 of the corresponding switch, the source of the MOS transistor is the first end b2 of the corresponding switch, the drain of the MOS transistor is the second end b3 of the corresponding switch, the control module 5 adjusts the second switch 7 to be turned on or off by adjusting the switch control signal output by the switch control signal output end A3 to the control end b1 of the second switch 7, when the second switch 7 is turned on, the control module 5 outputs the heating power signal to the first ends b2 of all the first switches 6 through the heating power signal output end a1, the control module 5 outputs the pulse adjustment signal, i.e. the PWM signal, to the control end b1 of the first switch 6 through the pulse adjustment signal output end a2, the first switch 6 corresponds to the high-low level period in the received pulse adjustment signal, and the first end b2 and the second end b3 are connected or disconnected, when the first end b2 and the second end b3 are communicated, the heating power signal is transmitted to the corresponding heating module 3, and the heating power of the corresponding heating module 3 is adjusted by controlling the communication time of the first end b2 and the second end b3 of the first switch 6.
Optionally, with reference to fig. 1 and fig. 2, the heating control device may further include at least three current detection modules, the current detection modules are disposed in one-to-one correspondence with the heating modules 3, the current detection modules are configured to detect real-time currents of the corresponding heating modules 3 and generate current detection signals, and the control module 5 is further configured to adjust the on states of the heating modules 3 through corresponding switches according to the received current detection signals.
Exemplarily, the current detection module may include a hall sensor, the current detection module may detect a real-time current of a corresponding heating module 3, when the heating modules 3 are all turned on, when the control module 5 determines that the real-time current of any one of the heating modules 3 exceeds a normal current range of the heating module 3 according to a circuit detection signal fed back by the current detection module, the control module 5 determines that the heating module 3 has a fault, the control module 5 closes a corresponding switch, and further closes all the heating modules 3, corresponding to the heating control device of the structure shown in fig. 1, the control module 5 may turn off all the first switches 6, and further close all the heating modules 3, corresponding to the heating control device of the structure shown in fig. 2, the control module 5 may turn off only the second switch 7, and further close all the heating modules 3, so as to prevent the heating modules 3 from operating all the time and causing overheating of the electric core 1, affecting the operating performance of the battery.
The embodiment of the invention also provides a heating control method of the battery, which can be executed by the heating control device of the battery of the embodiment and can be applied to application scenes needing to control the heating process of the battery. Fig. 3 is a schematic flow chart of a method for controlling heating of a battery according to an embodiment of the present invention. As shown in fig. 3, the heating control method of the battery includes:
s110, the temperature detection module detects the real-time temperature of the electric cores in the corresponding electric core group and generates a temperature detection signal.
And S120, the control module adjusts the opening state of the corresponding heating module through the first switch according to the temperature detection signal and the received external power supply signal.
Alternatively, with reference to fig. 1 and 2, when the control module 5 determines that the temperature of the electric core assembly 2 with the lowest temperature is less than or equal to the set temperature according to the temperature detection signal and the received external power signal is an effective external power signal, the control module controls all the heating modules 3 to be turned on through the first switch 6. All the heating films heat the corresponding electric core group 2 at the maximum power before the control module 5 adjusts the heating power of the corresponding heating module 3 through the first switch 6 according to the received temperature detection signal.
Optionally, with reference to fig. 1 and 2, when the control module 5 determines that the temperature of the electric core group 2 with the lowest temperature is greater than or equal to the set temperature according to the temperature detection signal, the control module controls all the heating modules 3 to be turned off through the corresponding switches; or, when the control module 5 determines that the battery supplies power to the heating modules 3 according to the received external power signal, the control module controls all the heating modules 3 to be turned off through the corresponding switches.
Specifically, when the control module 5 determines that the temperature of the electric core group 2 with the lowest temperature is greater than or equal to the set temperature according to the temperature detection signal fed back by the temperature detection module, and the set temperature is, for example, 5 ℃, it indicates that the battery has satisfied the charging condition at this time, and the heating film is turned off. . Or, when the control module 5 determines that the temperature difference between the electric core with the highest temperature and the electric core with the lowest temperature in the battery is greater than 12 ℃ according to the temperature detection signal fed back by the temperature detection module, it indicates that the battery is abnormal, at this time, the control module 5 may close all the heating modules 3 through the corresponding switches, corresponding to the heating control device shown in fig. 1, the control module 5 may close all the heating modules 3 by disconnecting the first switch 6, corresponding to the heating control device shown in fig. 2, the control module 5 may close all the heating modules 3 by disconnecting the second switch 7, so that the process of closing the heating modules 3 is simpler and more convenient, and all the heating modules 3 can be still closed when the first switch 6 fails.
Or, when the control module 5 determines that the battery supplies power to the heating modules 3 according to the received external power signal, for example, determines that the discharge current is greater than or equal to the current of the heating modules 3, the discharge current is the discharge current of the battery, the extraction current of the heating modules 3 is the sum of the extraction currents of all the heating modules 3, and when the former is greater than or equal to the latter, it indicates that the external power supply no longer supplies power to the heating modules 3, or the external load extracts current from the battery, based on the principle that the heating modules 3 do not extract power from the battery, at this time, the control module 5 may close all the heating modules 3 through the corresponding switches, corresponding to the heating control device shown in fig. 1, the control module 5 may close all the heating modules 3 by turning off the first switch 6, corresponding to the heating control device shown in fig. 2, the control module 5 may close all the heating modules 3 by turning off the second, the process of closing the heating modules 3 is simple and convenient, and all the heating modules 3 can be still closed when the first switch 6 is reported to be out of order.
S130, the control module adjusts the heating power of the corresponding heating module through the first switch according to the received temperature detection signal so that the temperature difference between the electric core group with the maximum temperature and the electric core group with the minimum temperature is smaller than or equal to a set difference.
Alternatively, with reference to fig. 1 and 2, the control module 5 obtains the electric core group 2 with the highest temperature according to the received temperature detection signal. The control module 5 adjusts the pulse adjusting signal output to the first switch 6 corresponding to the electric core group 2 with the maximum temperature and reduces the heating power of the heating module 3 corresponding to the electric core group 2 with the maximum temperature to the first set heating power. The control module 5 acquires the electric core group 2 with the maximum temperature again according to the received temperature detection signal at intervals of set time.
If the electric core group 2 with the maximum temperature determined in the two previous and subsequent times is the same electric core group 2, the control module 5 adjusts the pulse adjusting signal output to the first switch 6 corresponding to the electric core group 2 with the maximum temperature and reduces the heating power of the heating module 3 corresponding to the electric core group 2 with the maximum temperature to a second set heating power; wherein the second set heating power is less than the first set heating power; if the electric core groups 2 with the maximum temperature determined twice are different electric core groups 2, the control module 5 adjusts the pulse adjusting signal output to the first switch 6 corresponding to the electric core group 2 with the maximum current temperature and reduces the heating power of the heating module 3 corresponding to the electric core group 2 with the maximum temperature to the first set heating power, and recovers the heating power of the heating module 3 reduced last time to the maximum heating power.
The embodiment of the invention realizes that the battery is charged only when the temperature reaches the chargeable temperature of the battery, so that the use limit of the battery in the original low-temperature environment is greatly reduced, the battery can be applied to the more extreme working condition environment, the application range of the battery is expanded, and the problems of battery damage and incapability of recovery caused by charging the battery at low temperature are avoided. In addition, the control module continuously adjusts the heating power of the corresponding heating module according to the fed-back real-time temperatures of different electric core groups, so that the temperatures of all electric cores in the battery are close, the consistency of the temperatures of the electric cores is greatly improved, the consistency of the voltages between the electric cores is further optimized, the attenuation speed of the battery is reduced, and the service life of the battery is prolonged.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments illustrated herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. The heating control device of the battery is characterized in that the battery comprises a plurality of stacked battery cores, the battery cores are divided into at least three battery core groups, each battery core group comprises a plurality of battery cores, and the difference value of the number of the battery cores between the battery core group with the largest number of the battery cores and the battery core group with the smallest number of the battery cores is less than or equal to 1;
the heating control device includes:
the heating modules are arranged in one-to-one correspondence with the cell groups and used for heating the corresponding cells in the cell groups when the cell groups are started;
the temperature detection modules are arranged in one-to-one correspondence with the cell groups and are used for detecting the real-time temperature of the cells in the corresponding cell groups and generating temperature detection signals;
the control module is used for adjusting the opening state of the corresponding heating module through the first switch according to the temperature detection signal and the received external power supply signal, and adjusting the heating power of the corresponding heating module through the first switch according to the received temperature detection signal so that the temperature difference between the electric core group with the maximum temperature and the electric core group with the minimum temperature is smaller than or equal to a set difference.
2. The heating control device of claim 1, wherein the heating module is arranged at a distance from the cell group in the stacking direction of the cells;
preferably, the heating module comprises a heating film.
3. The heating control device of claim 1, wherein the control module comprises a heating power signal output and a plurality of pulse adjustment signal outputs;
the control end of the first switch is electrically connected with the corresponding pulse adjusting signal output end, the first end of the first switch is electrically connected with the heating power supply signal output end, the second end of the first switch is electrically connected with the corresponding heating module, and the first switch is used for adjusting the communication time between the first end and the second end of the first switch according to the pulse adjusting signal received by the control end of the first switch so as to adjust the heating power of the corresponding heating module.
4. The heating control device according to claim 1, further comprising:
and the control module is used for adjusting the opening state of the corresponding heating module through the first switch and the second switch according to the temperature detection signal and the received external power supply signal.
5. The heating control device of claim 4, wherein the control module comprises a switch control signal output, a heating power signal output, and a plurality of pulse adjustment signal outputs;
the control end of the second switch is electrically connected with the switch control signal output end, and the first end of the second switch is electrically connected with the heating power supply signal output end;
the control end of the first switch is electrically connected with the corresponding pulse adjusting signal output end, the first ends of all the first switches are in short circuit and are electrically connected with the second ends of the second switches, the second ends of the first switches are electrically connected with the corresponding heating modules, and the first switches are used for adjusting the connection time between the first ends and the second ends of the first switches according to the pulse adjusting signals received by the control ends of the first switches so as to adjust the heating power of the corresponding heating modules.
6. The heating control device according to claim 4 or 5, characterized by further comprising:
the current detection modules are arranged in one-to-one correspondence with the heating modules and are used for detecting real-time currents of the corresponding heating modules and generating current detection signals;
the control module is also used for adjusting the starting state of the heating module through a corresponding switch according to the received current detection signal;
preferably, the current detection module includes a hall sensor.
7. A heating control method for a battery, which is performed by the heating control apparatus for a battery according to any one of claims 1 to 6, the heating control method for a battery comprising:
the temperature detection module detects the real-time temperature of the electric cores in the corresponding electric core group and generates a temperature detection signal;
the control module adjusts the starting state of the corresponding heating module through the first switch according to the temperature detection signal and the received external power supply signal;
the control module adjusts the heating power of the corresponding heating module through the first switch according to the received temperature detection signal, so that the temperature difference between the electric core group with the maximum temperature and the electric core group with the minimum temperature is smaller than or equal to a set difference.
8. The heating control method according to claim 7, wherein the controlling module adjusting the on state of the corresponding heating module through the first switch according to the temperature detection signal and the received external power signal comprises:
the control module judges that the temperature of the electric core group with the lowest temperature is lower than a set temperature according to the temperature detection signal and controls all the heating modules to be started through the first switch when the received external power supply signal is an effective external power supply signal;
before the control module adjusts the heating power of the corresponding heating module through the first switch according to the received temperature detection signal, all the heating modules heat the corresponding electric core group at the maximum power.
9. The heating control method as claimed in claim 7, wherein the controlling module adjusts the heating power of the corresponding heating module through the first switch according to the received temperature detection signal so that the temperature difference between the electric core group with the maximum temperature and the electric core group with the minimum temperature is less than or equal to a set difference, comprises:
the control module acquires the electric core group with the maximum temperature according to the received temperature detection signal;
the control module adjusts a pulse adjusting signal output to a first switch of the corresponding electric core group with the maximum temperature and reduces the heating power of the heating module corresponding to the electric core group with the maximum temperature to a first set heating power;
the control module acquires the electric core group with the maximum temperature again according to the received temperature detection signal every time at intervals;
if the electric core groups with the maximum temperature determined in the two previous and subsequent times are the same electric core group, the control module adjusts the pulse adjusting signal output to the first switch corresponding to the electric core group with the maximum temperature and reduces the heating power of the heating module corresponding to the electric core group with the maximum temperature to a second set heating power; wherein the second set heating power is less than the first set heating power;
if the electric core group with the maximum temperature determined in the previous and subsequent two times is different, the control module adjusts the pulse adjusting signal output to the first switch corresponding to the electric core group with the maximum current temperature, reduces the heating power of the heating module corresponding to the electric core group with the maximum temperature to a first set heating power, and restores the heating power of the heating module reduced in the previous time to the maximum heating power.
10. The heating control method of claim 7, wherein the controlling module adjusting the on state of the corresponding heating module through the first switch according to the temperature detection signal and the received external power signal further comprises:
when the control module judges that the temperature of the electric core group with the lowest temperature is greater than or equal to a set temperature according to the temperature detection signal, all the heating modules are controlled to be closed through corresponding switches; alternatively, the first and second electrodes may be,
and when the control module judges that the battery supplies power to the heating modules according to the received external power supply signal, the control module controls all the heating modules to be closed through corresponding switches.
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| CN112186306A (en) * | 2020-10-13 | 2021-01-05 | 湖北亿纬动力有限公司 | Heating method and heating device of battery system |
| CN112398204A (en) * | 2020-12-02 | 2021-02-23 | 普联技术有限公司 | Intelligent auxiliary heating method and device for lithium battery and storage medium |
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| CN113394486A (en) * | 2021-05-28 | 2021-09-14 | 上海广为美线电源电器有限公司 | Emergency starting power supply preheating control system and method |
| CN115129106A (en) * | 2022-08-31 | 2022-09-30 | 深圳市倍轻松科技股份有限公司 | Heating circuit, control method, chip, electronic equipment and massager |
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