CN115241576A - Battery heating control method, battery heating control system and battery pack - Google Patents

Battery heating control method, battery heating control system and battery pack Download PDF

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Publication number
CN115241576A
CN115241576A CN202211150000.0A CN202211150000A CN115241576A CN 115241576 A CN115241576 A CN 115241576A CN 202211150000 A CN202211150000 A CN 202211150000A CN 115241576 A CN115241576 A CN 115241576A
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battery
current
control module
heating
main control
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CN202211150000.0A
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CN115241576B (en
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仝俊利
牛力
郭其鑫
惠梦梦
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China Lithium Battery Technology Co Ltd
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China Lithium Battery Technology Co Ltd
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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
    • H01M10/637—Control systems characterised by the use of reversible temperature-sensitive devices, e.g. NTC, PTC or bimetal devices; characterised by control of the internal current flowing through the cells, e.g. by switching
    • 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
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • 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
    • 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
    • H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
    • H01M10/625—Vehicles
    • 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
    • H01M10/633—Control systems characterised by algorithms, flow charts, software details or the like
    • 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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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Automation & Control Theory (AREA)
  • Secondary Cells (AREA)
  • Materials Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention discloses a battery heating control method, a battery heating control system and a battery pack, wherein the system comprises: the main control module is respectively and electrically connected with the motor electric control module and the control end of the battery; the input end and the output end of the electric control module of the motor are respectively and electrically connected with the output end and the input end of the battery; the main control module is used for controlling the charging current output to the battery by the motor electric control module when the battery meets the heating condition to be smaller than the discharging current output to the motor electric control module by the battery when the battery discharges. Therefore, the battery self-heating device can realize the self-heating of the battery by improving the internal resistance of the battery heating, and is beneficial to improving the heating efficiency of the battery.

Description

Battery heating control method, battery heating control system and battery pack
Technical Field
The invention relates to the technical field of batteries, in particular to a battery heating control method, a battery heating control system and a battery pack.
Background
The dynamic performance of a power battery (such as a lithium ion battery) in a low-temperature environment is poor, the discharge capacity is greatly reduced, low-temperature endurance is reduced, meanwhile, the charging duration is prolonged, and the customer experience is influenced, such as the driving experience of a customer.
At present, the problem of poor low-temperature performance of the battery is solved by generally adopting a mode of preheating the battery in the industry, and the current battery heating method which is commonly used is heating film heating and PTC liquid heating. The heating principle of the heating film is to directly heat the battery through the heating of the resistor, and the principle of the PTC liquid heat is to indirectly heat the battery after heating the cooling liquid. However, it has been found in practice that heating efficiency is low in both heating film heating and PTC liquid heating.
Therefore, it is important to provide a new battery heating method to improve the heating efficiency of the battery.
Disclosure of Invention
The invention provides a battery heating control method, a battery heating control system and a battery pack, which can realize self-heating of a battery by improving the heating internal resistance of the battery and are beneficial to improving the heating efficiency of the battery.
In order to solve the above technical problem, a first aspect of the present invention discloses a battery heating control system, which includes a main control module and a motor electric control module, wherein:
the first input end of the motor electric control module is used for being electrically connected with the first output end of the battery, and the first output end of the motor electric control module is used for being electrically connected with the first input end of the battery; the main control module is respectively electrically connected with the control end of the motor electric control module and the control end of the battery;
the main control module is used for controlling the motor electric control module to output charging current to the battery when the battery is charged and to be smaller than first discharging current output by the battery to the motor electric control module when the battery is discharged when the battery meets the predetermined heating condition.
In a second aspect, the invention discloses a battery pack, wherein the battery comprises a battery body and any one of the battery heating control systems disclosed in the first aspect of the invention.
The third aspect of the present invention discloses a battery heating control method, which is applied to a main control module included in a battery heating control system, wherein the battery heating control system further includes a motor electric control module, the main control module is used for realizing the heating control of a battery, and the method includes:
the main control module judges whether the battery meets a predetermined heating condition, and when the battery meets the predetermined heating condition, the main control module controls the battery to discharge in an orthogonal current electric time period, wherein when the battery discharges, the battery outputs a first discharge current to the motor electric control module;
in a negative alternating current time period after the orthogonal current time period is ended, the main control module controls the motor electric control module to output charging current to the battery to charge the battery; wherein the charging current is less than the first discharging current.
The invention discloses a battery heating control system, which comprises a main control module and a motor electric control module, wherein a first input end of the motor electric control module is electrically connected with a first output end of a battery; the main control module is respectively electrically connected with the control end of the motor electric control module and the control end of the battery; the master control module comprises:
a memory storing executable program code;
a processor coupled with the memory;
the processor calls the executable program codes stored in the memory to execute part or all of the steps in the battery heating control method disclosed by the third aspect of the invention.
A fifth aspect of the present invention discloses a computer storage medium storing computer instructions for performing some or all of the steps of the battery heating control method disclosed in the third aspect of the present invention when the computer instructions are invoked.
The invention discloses an electric automobile in a sixth aspect, which comprises an automobile body and the battery pack disclosed in the second aspect of the invention.
Compared with the prior art, the invention has the following beneficial effects:
the invention can control the charging current output to the battery by the electric control module of the motor when the battery is charged to be smaller than the discharging current output to the electric control module of the motor by the battery when the battery is discharged, thereby enabling the battery to be in an overdischarge state, increasing the internal resistance of the battery, realizing the self-heating of the battery and being beneficial to improving the heating efficiency or the temperature rising efficiency of the battery.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a battery heating control system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of another battery heating control system according to an embodiment of the disclosure;
FIG. 3 is a schematic flow chart illustrating a method for controlling battery heating according to an embodiment of the present invention;
FIG. 4 is a schematic flow chart of another method for controlling heating of a battery according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of a main control module applied to a battery heating control system according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
The terms "first," "second," and the like in the description and claims of the present invention and in the above-described drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, apparatus, article, or article that comprises a list of steps or elements is not limited to only those steps or elements but may alternatively include other steps or elements not expressly listed or inherent to such process, method, article, or article.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the invention. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
The invention discloses a battery heating control method, a battery heating control system and a battery pack, which can control the charging current output to a battery by a motor electric control module when the battery is charged to be smaller than the discharging current output to the motor electric control module by the battery when the battery is discharged, so that the battery can be in an overdischarge state, the internal resistance of the battery is increased, the self-heating of the battery is realized, and the heating efficiency or the temperature rise efficiency of the battery is favorably improved; in addition, can also form the direct current offset that discharges with pulse self-heating and reposition of redundant personnel subassembly heating coupling design when high frequency pulse self-heating, provide some pulse discharge energy for reposition of redundant personnel subassembly power supply, not only can further improve the heating efficiency of battery under the unchangeable circumstances of electric current and frequency like this, can also reduce the waste of pulse energy, be favorable to improving the utilization ratio of pulse energy. The following are detailed below.
Example one
Referring to fig. 1, fig. 1 is a schematic structural diagram of a battery heating control system according to an embodiment of the present invention. The battery heating control system shown in fig. 1 is used to realize heating control of a battery (such as a battery pack of a whole vehicle) to be heated, and further, the battery to be heated may be a power battery, such as a lithium ion battery, and the embodiment of the present invention is not limited. As shown in fig. 1, the battery heating control system at least includes a main control module 101 and a motor electric control module 102, wherein:
a first input end of the motor electric control module 102 is used for being electrically connected with a first output end of the battery 103, and a first output end of the motor electric control module 102 is used for being electrically connected with a first input end of the battery 103; the main control module 101 is electrically connected to a control terminal of the motor control module 102 and a control terminal of the battery 103.
In the battery heating control system shown in fig. 1, the main control module 101 is configured to:
when it is determined that the battery 103 satisfies the predetermined heating condition, the charging current output to the battery 103 when controlling the motor electric control module 102 to charge the battery 103 is smaller than the first discharging current output to the motor electric control module 102 by the battery 103 when discharging the battery 103.
In the embodiments of the present invention, it should be noted that: the predetermined heating condition that the battery 103 satisfies may be, specifically, that the battery 103 needs to be heated, or may be, specifically, that the battery 103 needs to be heated and the state information of the battery itself enables battery self-heating, preferably the latter.
Specifically, the charging current output to the battery 103 when the motor electronic control module 102 is controlled to charge the battery 103 is smaller than the first discharging current output to the motor electronic control module 102 by the battery 103 when the battery 103 is discharged, that is, the first discharging current is: the effective value of the charging current output to the battery 103 when controlling the motor electric control module 102 to charge the battery 103 is smaller than the effective value of the first discharging current output to the motor electric control module 102 by the battery 103 when discharging the battery 103.
In this embodiment of the present invention, specifically, after determining that the battery 103 meets the heating condition, the main control module 101 may specifically be configured to:
the main control module 101 controls the battery 103 to output a first discharging current a to the motor electronic control module 102 in the time period of the orthogonal current (e.g. positive half period of the alternating current) D1 Controlling the motor control module 102 to output the charging current A to the battery 103 during the period of negative AC power (e.g. during the negative half period of AC power) C And a charging current A C Less than the first discharge current A D1 Namely: charging current A C Effective value of (I) C Less than the first discharge current A D1 Of (a) is a significant value of D1 。
In the time period of the orthogonal current, the battery 103 is used as a power supply to discharge to the motor electric control module 102, and at this time, the motor electric control module 102 is equivalent to an inductor and has an electric energy storage function; during the negative ac time period, the motor electronic control module 102 is a power source, which discharges the battery 103. Since the current drawn by the battery 103 in the negative alternating current period is smaller than the current discharged by the battery 103 in the quadrature current period, the battery 103 is in an overdischarge state, and the internal resistance of the battery 103 increases to achieve self-heating.
It should be noted that the main control module 101 may control the battery 103 to continuously output the first discharge current a to the motor electric control module 102 during the whole time period or a part of the time period of the quadrature current electric time period D1 The battery 103 may be controlled to intermittently output the first discharge current a to the motor electronic control module 102 during the whole time period or a part of the time period of the quadrature current flow time period D1 In addition, the main control module 101 may control the motor control module 102 to continuously output the charging current a to the battery 103 during the whole period or a part of the negative ac period C The motor electric control module 102 may also be controlled to intermittently output the charging current a to the battery 103 during the whole time period or a part of the time period of the negative alternating current power supply C The embodiment of the present invention does not limit this.
Therefore, when the battery heating control system described in the embodiment of the invention is implemented, the charging current output to the battery by the motor electric control module during the battery charging can be controlled to be smaller than the discharging current output to the motor electric control module by the battery during the battery discharging, so that the battery can be in an overdischarge state, the internal resistance of the battery is increased, the self-heating of the battery is realized, and the heating efficiency or the temperature rise efficiency of the battery is favorably improved.
In an alternative embodiment, as shown in fig. 2, a second output of the motor control module 102 is configured to be electrically connected to an input of the shunt assembly 104 based on the battery heating control system configuration shown in fig. 1. The main control module 101 may be further configured to control the motor electronic control module 102 to output a bias current to the shunt assembly 104 when the battery 103 meets a predetermined heating condition and when the motor electronic control module 102 outputs a charging current to the battery 103.
In this alternative embodiment, the bias current provided by the motor electronic control module 102 to the shunt assembly 104 when the battery 103 is charged is used to supply power to the loop where the shunt assembly 104 is located, and further, the bias current provided by the motor electronic control module 102 to the shunt assembly 104 when the battery 103 is charged may be specifically used to implement heating of the shunt assembly 104. Alternatively, the shunt assembly 104 may be a component having a heating function in a device (e.g., a vehicle) to which the battery 103 is applied, such as a PTC heater, a vehicle air conditioner, a vehicle seat heater, or the like.
In this optional embodiment, in the negative ac power time period, the main control module 101 controls the motor electronic control module 102 to output the bias current a to the shunt assembly 104 B Optionally, the bias current A B Effective value of (I) B May be equal to the first discharge current A D1 Effective value of (1) D1 And a charging current A C Effective value of (I) C The difference of (a).
Therefore, the optional embodiment can also adopt a pulse self-heating and shunt assembly heating coupling design, form direct current discharge bias during high-frequency pulse self-heating, and supply partial pulse discharge energy to the shunt assembly to supply power to the shunt assembly, so that the heating efficiency of the battery can be further improved under the condition that the current and the frequency are not changed, the waste of pulse energy can be reduced, and the utilization rate of the pulse energy can be improved.
In another alternative embodiment, as shown in fig. 2, the battery heating control system may further include a data acquisition module 105. In the battery heating control system shown in fig. 2, the control end of the data acquisition module 105 is electrically connected to the main control module 101, and the data acquisition end of the data acquisition module 105 is used to be electrically connected to the battery 103, wherein:
a data acquisition module 105, configured to acquire current state information of the battery 103 and provide the current state information to the main control module 101;
the main control module 101 is further configured to receive current state information reported by the data acquisition module 105, determine whether the battery meets a predetermined heating condition according to the current state information, and execute a corresponding heating control operation on the battery 103 when it is determined that the battery meets the predetermined heating condition according to the current state information.
It should be noted that, in practical applications, the data acquisition module 105 may automatically acquire the state information of the battery 103 at regular or irregular time, and may also perform the state information acquisition operation corresponding to the battery according to an acquisition instruction triggered by a relevant person, which is not limited in the embodiment of the present invention.
It can be seen that the data acquisition module 105 included in the battery heating control system described in this optional embodiment can realize the intelligent acquisition and judgment of the battery heating requirement judgment parameters, and is favorable for improving the judgment efficiency of whether the battery meets the heating condition, so as to be favorable for realizing the timeliness of heating the battery when the battery needs to be heated.
In this optional embodiment, further optionally, the current state information at least may include current temperature information of the battery 103. The specific manner of determining whether the battery 103 meets the predetermined heating condition according to the current state information by the main control module 101 may include:
the main control module 101 determines whether the temperature value corresponding to the current temperature information is lower than a predetermined temperature threshold, and if so, determines that the battery 103 meets the predetermined heating condition.
Optionally, the predetermined temperature threshold may be a preset default temperature value, or may be determined according to at least one of a working state of a current device (such as a new energy vehicle, a hybrid vehicle, and the like) to which the battery is applied, a current scenario in which the current device to which the battery is applied is located, and a current ambient temperature of the scenario in which the current device to which the battery is applied is located, which is not limited in the embodiment of the present invention.
Therefore, the optional embodiment can judge whether the battery meets the heating condition according to the temperature value of the battery, and is beneficial to improving the judgment efficiency and the judgment accuracy.
In this optional embodiment, still further optionally, the current State information further includes current remaining capacity information of the battery 103, such as State of Charge (SOC) information of the battery 103. The specific manner of the main control module 101 determining whether the battery 103 meets the predetermined heating condition according to the current state information may further include:
when the temperature value corresponding to the current temperature information is lower than the temperature threshold value, the main control module 101 determines whether the remaining power corresponding to the current remaining power information meets a predetermined power condition, and when the remaining power corresponding to the current remaining power information meets the power condition, triggers the operation of determining that the battery 103 meets the predetermined heating condition; alternatively, the first and second liquid crystal display panels may be,
when the temperature value corresponding to the current temperature information is lower than the temperature threshold value, the main control module 101 determines whether another power supply currently exists to charge the battery 103, and when it is determined that another power supply exists to charge the battery 103, triggers the operation for determining that the battery 103 meets the predetermined heating condition; alternatively, the first and second liquid crystal display panels may be,
when the temperature value corresponding to the current temperature information is lower than the temperature threshold value, the main control module 101 determines whether the remaining power corresponding to the current remaining power information meets a predetermined power condition, determines whether another power supply currently exists to charge the battery 103 when the remaining power corresponding to the current remaining power information does not meet the power condition, and triggers the operation of determining that the battery 103 meets the predetermined heating condition when it is determined that another power supply currently exists to charge the battery 103.
Further optionally, the specific manner of determining, by the main control module 101, whether the remaining power corresponding to the current remaining power information meets the predetermined power condition may include:
the main control module 101 judges whether the remaining power corresponding to the current remaining power information is within a predetermined remaining power range, and when the judgment result is yes, determines that the remaining power corresponding to the current remaining power information meets a predetermined power condition; alternatively, the first and second liquid crystal display panels may be,
the main control module 101 calculates the duration of the remaining power corresponding to the current remaining power information, and determines whether the duration is within a predetermined duration range, and when it is determined that the duration of the remaining power is within the predetermined duration range, determines that the remaining power corresponding to the current remaining power information satisfies a predetermined power condition; alternatively, the first and second electrodes may be,
the main control module 101 determines whether the remaining power corresponding to the current remaining power information is within a predetermined remaining power range, calculates a duration of the remaining power corresponding to the current remaining power information and determines whether the duration of the remaining power is within the predetermined duration range, and determines that the remaining power corresponding to the current remaining power information satisfies a predetermined power condition when it is determined that the duration of the remaining power is within the predetermined duration range.
The following are specifically mentioned: the precondition for realizing the self-heating of the battery 103 in the embodiment of the present invention is to make the battery 103 in an overdischarge state, that is: the discharge current of the battery is controlled to be larger than the charge current of the battery 103. Therefore, when determining whether the battery 103 satisfies the heating condition, the current remaining capacity information of the battery 103 and/or whether there is another power source currently in charge of the battery may be further considered in addition to the temperature value of the battery 103 itself.
Therefore, the optional embodiment can further combine the current remaining power information of the battery and/or the current existence of other power supplies to charge the battery to realize the accurate judgment of whether the battery meets the heating condition on the basis of preliminarily judging that the battery 103 needs to be heated according to the current temperature value of the battery 103, thereby being beneficial to further improving the judgment accuracy of whether the battery meets the heating condition and further being beneficial to improving the accuracy of self-heating control on the battery.
In another optional embodiment, the main control module 101 may further be configured to:
in the process of heating the battery 103, receiving the real-time state information of the battery 103 acquired by the data acquisition module 105, judging whether the real-time condition meets a bias current adjustment condition according to the real-time state information, and controlling the motor electronic control module 102 to adjust the bias current provided to the shunt assembly 104 when the battery 103 is charged; the real-time state information of the battery 103 acquired by the data acquisition module 105 at least includes real-time temperature information of the battery 103, and further may include real-time remaining power information of the battery 103.
In the embodiment of the present invention, the adjustment of the bias current provided to the shunt assembly 104 by the motor electronic control module 102 when the battery 103 is charged by the motor electronic control module can specifically realize the adjustment of the magnitude of the bias current according to different heating requirements. Optionally, the heating requirement may be a target heating temperature requirement and/or a temperature rise efficiency requirement, and the embodiment of the present invention is not limited.
It should be noted that the real-time status information of the battery 103 collected by the data collection module 105 may be the real-time status information of the battery 103 collected at a certain time, or may be the real-time status information of the battery 103 collected within a certain time period. If the data acquisition module 105 acquires the real-time status information of the battery 103 within a certain time period, the acquired real-time status information may specifically be a status information change condition of the battery. In addition, the data collection module 105 may collect real-time status information of the battery 103 at regular or irregular intervals during the self-heating of the battery 103.
Therefore, in the optional embodiment, the dynamic control of the self-heating process of the battery 103 can be realized through the real-time state information of the battery 103 acquired by the data acquisition module 105 in the process of controlling the self-heating of the battery 103, which is beneficial to reducing the occurrence of battery overheating or low battery temperature rise efficiency, thereby not only realizing the dynamic control of the self-heating of the battery 103, but also improving the accuracy of the dynamic control of the self-heating of the battery 103.
In still another alternative embodiment, the ratio of the effective value of the bias current to the effective value of the total discharge current output by the battery 103 during discharge ranges from 0.05 to 0.5.
Further alternatively, the effective value of the total discharge current output by the battery 103 during discharge is 200 to 350A.
Further optionally, when the battery 103 is self-heated, the alternating current frequency range of the battery 103 is 200 to 1500hz.
Therefore, the optional embodiment can set the control parameters of the battery 103 during self-heating, realize the precise control of the self-heating of the battery 103, be beneficial to reducing the overheating of the battery 103, and improve the reliability of the self-heating of the battery 103 while realizing the self-heating of the battery 103.
In a further optional embodiment, the main control module 101 may be further configured to control the battery 103 to output a second discharge current to the shunt assembly 104 when the battery 103 is discharged, so that energy storage of the motor electronic control module 102 and power supply to the shunt assembly 104 are simultaneously achieved when the battery 103 is discharged.
At this time, the total discharge current output by the battery 103 when discharging includes a first discharge current flowing from the battery 103 to the motor control module 102 when the battery 103 is discharging and a second discharge current flowing from the battery 103 to the shunt assembly 104, that is: total discharge current A output by battery 103 during discharge D Effective value of (I) D Equal to a first discharge current A flowing from the battery 103 to the motor electric control module 102 when the battery 103 is discharged D1 Effective value of (I) D1 And a second discharge current A flowing from the battery 103 to the shunt assembly 104 D2 Is provided withRoot mean square value I D2 The sum of (a) and (b).
Wherein, the second discharging current A flows from the battery 103 to the shunt assembly 104 D2 Effective value of (I) D2 May be zero, which maximizes the energy stored by the motor control module 102 when the battery 103 is discharged.
In yet another alternative embodiment, a rectifying element may be disposed before shunt assembly 104 to adjust the current provided to shunt assembly 104 to the current profile required by shunt assembly 104. Further alternatively, the battery heating control system may comprise a rectifying element (not shown in fig. 1, 2).
In a further optional embodiment, the main control module 101 may further be electrically connected to a control terminal of the shunt assembly 104, so that the shunt assembly 104 may be controlled by the main control module 101 without designing other control modules, which is beneficial to reducing the complexity of the battery heating control system and reducing the cost of the battery heating control system.
In yet another alternative embodiment, the output end of the shunt assembly 104 may be electrically connected to the motor electronic control module 102, so that when the motor electronic control module 102 or the battery 103 outputs current to the shunt assembly, the shunt assembly 104 forms an energizing loop, thereby ensuring reasonable utilization of pulse energy. It should be noted that if the shunt assembly 104 can form a power loop inside, the output end of the shunt assembly 104 does not need to be electrically connected to other modules.
It can be seen that the battery heating control system described in fig. 2 can also adopt a pulse self-heating and shunt assembly heating coupling design, form a direct current discharge bias during high-frequency pulse self-heating, and provide part of pulse discharge energy to the shunt assembly to supply power to the shunt assembly, so that not only can the heating efficiency of the battery be further improved under the condition of unchanged current and frequency, but also the waste of pulse energy can be reduced, which is beneficial to improving the utilization rate of pulse energy; in addition, the intelligent acquisition and judgment of the battery heating requirement judgment parameters can be realized, the judgment efficiency of whether the battery meets the heating condition is improved, and the timeliness of heating the battery is realized when the battery needs to be heated; in addition, the judgment on whether the battery meets the heating condition or not can be realized according to the temperature value of the battery, so that the judgment efficiency and the judgment accuracy are improved; in addition, the accurate judgment of whether the battery meets the heating condition or not can be further realized by further combining the current residual electric quantity information of the battery on the basis of primarily judging that the battery 103 needs to be heated according to the current temperature value of the battery 103, so that the judgment accuracy of whether the battery meets the heating condition or not can be further improved, and the accuracy of self-heating control on the battery can be further improved; in addition, dynamic control over the self-heating process of the battery 103 can be achieved through real-time state information of the battery 103 acquired by the data acquisition module 105 in the process of controlling the self-heating of the battery 103, so that the situations of battery overheating or low battery temperature rise efficiency can be reduced, the dynamic control over the self-heating of the battery 103 is achieved, and the accuracy of the dynamic control over the self-heating of the battery 103 can be improved; in addition, control parameters during self-heating of the battery 103 can be set, accurate control over the self-heating of the battery 103 is achieved, overheating of the battery 103 is reduced, and reliability of the self-heating of the battery 103 is improved while the self-heating of the battery 103 is achieved.
Example two
Referring to fig. 3, fig. 3 is a schematic flow chart illustrating a battery heating control method according to an embodiment of the present invention. The method described in fig. 3 may be applied to a main control module included in a battery heating control system, where the battery heating control system further includes a motor electronic control module, and the main control module is configured to implement heating control on a battery, and further, the battery to be heated may be a power battery, such as a lithium ion battery, and the embodiment of the present invention is not limited. As shown in fig. 3, the method may include the operations of:
201. the main control module determines whether the battery satisfies the predetermined heating condition, and when the determination result in step 201 is yes, step 202 may be triggered to be executed.
In this embodiment of the present invention, when the determination result in step 201 is negative, the process may be ended, or step 201 may be continuously triggered to be executed, which is not limited in this embodiment of the present invention.
In the embodiments of the present invention, it should be noted that: the battery satisfying the predetermined heating condition may specifically be that the battery needs to be heated, or may specifically be that the battery needs to be heated and the state information of the battery itself enables self-heating of the battery, preferably the latter.
202. When the battery meets the predetermined heating condition, the main control module controls the battery to discharge in the orthogonal current time period, wherein when the battery discharges, the battery outputs a first discharge current to the motor electric control module.
203. In a negative alternating current time period after the end of the orthogonal current time period, the main control module controls the motor electric control module to output charging current to the battery to charge the battery, wherein the charging current output to the battery by the motor electric control module is smaller than first discharging current.
In the embodiment of the present invention, the charging current output by the motor electronic control module to the battery is smaller than the first discharging current, specifically, an effective value of the charging current output by the motor electronic control module to the battery when the battery is charged by the motor electronic control module is smaller than an effective value of the first discharging current output by the battery to the motor electronic control module when the battery is discharged by the battery.
In an optional embodiment, when the battery meets the predetermined heating condition and when the motor electronic control module is controlled to output the charging current to the battery, the main control module may further control the motor electronic control module to output the bias current to the shunt assembly electrically connected to the motor electronic control module.
Alternatively, the shunt component may be a component having a heating function in a device (e.g., a vehicle) to which the battery is applied, such as a PTC heater, a vehicle air conditioner, a vehicle seat heater, and the like.
It should be noted that the quadrature current time period may be a positive half period of the alternating current, and the negative alternating current time period may be a negative half period of the alternating current.
Optionally, the main control module may be further electrically connected to the control terminal of the shunt assembly, so that the shunt assembly may be controlled by the main control module without designing other control modules, which is beneficial to reducing the complexity of the battery heating control system and reducing the cost of the battery heating control system.
Optionally, the output end of the shunt assembly can be electrically connected with the electric control module of the motor, so that the shunt assembly can form a power-on loop when the electric control module of the motor or the battery outputs current to the shunt assembly, and reasonable utilization of pulse energy is further ensured. It should be noted that if the shunt assembly can form an energizing circuit inside, the output end of the shunt assembly does not need to be electrically connected with other modules.
It can be seen that in the method described in fig. 3, in the time period of the orthogonal current, the battery is used as a power supply to discharge to the electric control module of the motor, and at this time, the electric control module of the motor is equivalent to an inductor and has an effect of storing electric energy; in the time period of negative alternating current, the electric control module of the motor is a power supply and discharges electricity to the battery; the current obtained by the battery in the negative alternating current time period is smaller than the current discharged by the battery in the orthogonal current time period, so that the battery is in an overdischarge state, the internal resistance of the battery is increased, the self-heating of the battery is realized, and the heating efficiency or the temperature rise efficiency of the battery is favorably improved; in addition, the design of pulse self-heating and shunt assembly heating coupling can be realized, direct current discharge bias is formed when high-frequency pulse self-heating is carried out, partial pulse discharge energy is supplied to the shunt assembly to supply power to the shunt assembly, so that the heating efficiency of the battery can be further improved under the condition that the current and the frequency are not changed, the waste of pulse energy can be reduced, and the utilization rate of the pulse energy can be improved.
EXAMPLE III
Referring to fig. 4, fig. 4 is a schematic flow chart illustrating another battery heating control method according to an embodiment of the present invention. The method described in fig. 4 may be applied to a main control module included in a battery heating control system, where the battery heating control system further includes a motor electronic control module and a data acquisition module, a control end of the data acquisition module is electrically connected to the main control module, a data acquisition end of the data acquisition module is used for being electrically connected to a battery, and the main control module is used for implementing heating control on the battery. As shown in fig. 4, the method may include the operations of:
301. the main control module receives the current state information of the battery reported by the data acquisition module.
302. The main control module determines that the battery meets the predetermined heating condition according to the current state information, and when the determination result in step 302 is yes, step 303 may be triggered to be executed.
In this embodiment of the present invention, when the determination result in step 302 is negative, the process may be ended, or step 301 may be continuously triggered to be executed, which is not limited in this embodiment of the present invention.
303. When the battery is judged to meet the predetermined heating condition, the main control module controls the battery to discharge in the orthogonal current time period, wherein when the battery discharges, the battery outputs a first discharge current to the motor electric control module.
304. In a negative alternating current time period after the end of the orthogonal current time period, the main control module controls the motor electric control module to output charging current to the battery to charge the battery and controls the motor electric control module to output bias current to a shunt assembly electrically connected with the motor electric control module when the battery is charged, wherein the charging current output to the battery by the motor electric control module is smaller than a first discharging current.
Wherein the effective value of the bias current is equal to the difference between the effective value of the first discharge current and the effective value of the charge current.
It can be seen that, when the method described in fig. 4 is implemented, when the heating control of the battery is implemented, the charging current output from the motor electronic control module to the battery during the charging of the battery is controlled to be smaller than the discharging current output from the battery to the motor electronic control module during the discharging of the battery, so that the battery can be in an overdischarge state, the internal resistance of the battery is increased, the self-heating of the battery is implemented, and the heating efficiency or the temperature rise efficiency of the battery is improved; in addition, can also form the direct current offset that discharges with pulse self-heating and reposition of redundant personnel subassembly heating coupling design when high frequency pulse self-heating, provide some pulse discharge energy for reposition of redundant personnel subassembly power supply, not only can further improve the heating efficiency of battery under the unchangeable circumstances of electric current and frequency like this, can also reduce the waste of pulse energy, be favorable to improving the utilization ratio of pulse energy. In addition, can also realize that the intelligent collection and the judgement of battery heating demand judgement parameter are favorable to improving the judgement efficiency whether to satisfy the heating condition to the battery, and then be favorable to realizing the promptness to the battery heating when the battery needs the heating.
In an alternative embodiment, as shown in fig. 4, the method may further include the operations of:
305. in the process of heating the battery, the main control module receives the real-time state information of the battery acquired by the data acquisition module and judges whether the real-time condition meets the bias current adjustment condition or not according to the real-time state information.
306. And when the real-time condition is judged to meet the bias current adjusting condition, the electric control module of the control motor adjusts the bias current provided for the shunt assembly when the battery is charged.
The real-time state information at least comprises real-time temperature information of the battery, and further comprises real-time remaining capacity information of the battery.
In the embodiment of the invention, the bias current provided by the motor electronic control module to the shunt assembly when the motor electronic control module is used for adjusting the battery charging can be specifically adjusted according to different heating requirements. Optionally, the heating requirement may be a target heating temperature requirement and/or a temperature rise efficiency requirement, and the embodiment of the present invention is not limited.
It should be noted that the real-time status information of the battery collected by the data collection module may be the real-time status information of the battery collected at a certain time, or may be the real-time status information of the battery collected within a certain time period. If the data acquisition module acquires the real-time state information of the battery within a certain time period, the acquired real-time state information may be specifically the state information change condition of the battery. In addition, the data acquisition module can acquire real-time state information of the battery at regular time or irregular time in the self-heating process of the battery.
Therefore, by implementing the method described in fig. 4, the dynamic control of the battery self-heating process can be realized through the real-time state information of the battery acquired by the data acquisition module in the process of controlling the battery self-heating, which is beneficial to reducing the occurrence of battery overheating or battery temperature rise efficiency, thereby not only realizing the dynamic control of the battery self-heating, but also improving the accuracy of the dynamic control of the battery self-heating.
In another optional embodiment, the current state information at least includes current temperature information of the battery. Wherein, host system judges whether the battery satisfies predetermined heating condition according to current state information, can include:
the main control module judges whether the temperature value corresponding to the current temperature information is lower than a predetermined temperature threshold value or not, and when the judgment result is yes, the battery is determined to meet the predetermined heating condition.
Therefore, the optional embodiment can also judge whether the battery meets the heating condition according to the temperature value of the battery, and is beneficial to improving the judgment efficiency and the judgment accuracy.
In this optional embodiment, it is further optional that the current state information may further include current remaining capacity information of the battery. Wherein, host system judges whether the battery satisfies predetermined heating condition according to current state information, still includes:
when the temperature value corresponding to the current temperature information is judged to be lower than the temperature threshold value, the main control module judges whether the residual electric quantity corresponding to the current residual electric quantity information meets a predetermined electric quantity condition or not, and when the residual electric quantity corresponding to the current residual electric quantity information meets the electric quantity condition, the operation of determining that the battery meets the predetermined heating condition is triggered; alternatively, the first and second electrodes may be,
when the temperature value corresponding to the current temperature information is judged to be lower than the temperature threshold value, the main control module judges whether other power supplies are used for charging the battery or not, and when the other power supplies are judged to be used for charging the battery, the operation of determining that the battery meets the predetermined heating condition is triggered; alternatively, the first and second electrodes may be,
when the temperature value corresponding to the current temperature information is lower than the temperature threshold value, the main control module judges whether the residual electric quantity corresponding to the current residual electric quantity information meets a predetermined electric quantity condition, when the residual electric quantity corresponding to the current residual electric quantity information does not meet the electric quantity condition, whether other power supplies exist for charging the battery is judged, and when the other power supplies are judged to exist for charging the battery, the operation of determining that the battery meets the predetermined heating condition is triggered.
Still further optionally, the determining, by the main control module, whether the remaining power corresponding to the current remaining power information meets a predetermined power condition may include:
the main control module judges whether the residual capacity corresponding to the current residual capacity information is in a predetermined residual capacity range, and when the judgment result is yes, the main control module determines that the residual capacity corresponding to the current residual capacity information meets a preset capacity condition; alternatively, the first and second electrodes may be,
the main control module calculates the endurance time of the residual electric quantity corresponding to the current residual electric quantity information, judges whether the endurance time is in a predetermined endurance time range, and determines that the residual electric quantity corresponding to the current residual electric quantity information meets a preset electric quantity condition when judging that the endurance time of the residual electric quantity is in the predetermined endurance time range; alternatively, the first and second electrodes may be,
the main control module judges whether the residual capacity corresponding to the current residual capacity information is in a predetermined residual capacity range, when the judgment result is yes, the endurance duration of the residual capacity corresponding to the current residual capacity information is calculated, whether the endurance duration is in the predetermined endurance duration range is judged, and when the endurance duration of the residual capacity is judged to be in the predetermined endurance duration range, the residual capacity corresponding to the current residual capacity information is determined to meet a preset capacity condition.
The following are specifically mentioned: the precondition for realizing the self-heating of the battery in the embodiment of the invention is that the battery is in an overdischarge state, namely: and controlling the discharging current of the battery to be larger than the charging current of the battery. Therefore, when determining whether the battery satisfies the heating condition, in addition to considering the temperature value of the battery itself, the current remaining capacity information of the battery and/or whether there is another power source currently in charge of the battery may be further considered.
Therefore, the optional embodiment can further combine the current residual capacity information of the battery and/or the current existence of other power supplies to charge the battery to realize the accurate judgment of whether the battery meets the heating condition on the basis of preliminarily judging that the battery needs to be heated according to the current temperature value of the battery, thereby being beneficial to further improving the judgment accuracy of whether the battery meets the heating condition and further being beneficial to improving the accuracy of self-heating control on the battery.
In yet another alternative embodiment, the ratio of the effective value of the bias current to the effective value of the total discharge current output by the battery when discharging ranges from 0.05 to 0.5.
Further optionally, the effective value of the total discharge current output by the battery during discharge is 200 to 350A.
Further optionally, when the battery is self-heated, the alternating current frequency range of the battery is 200 to 1500Hz.
Therefore, the optional embodiment can set the control parameters during the self-heating of the battery, realize the accurate control of the self-heating of the battery, be beneficial to reducing the overheating of the battery, and improve the self-heating reliability of the battery while realizing the self-heating of the battery.
In yet another alternative embodiment, the method may further include the operations of:
the main control module controls the battery to output a second discharge current to the shunt assembly when the battery discharges, so that energy storage of the motor electric control module and power supply to the shunt assembly are realized simultaneously when the battery discharges.
At this time, the total discharge current output by the battery when discharging includes a first discharge current flowing from the battery to the motor electronic control module when the battery is discharging and a second discharge current flowing from the battery to the shunt assembly, that is: the total discharge current A output by the battery during discharging D Effective value of (I) D Equal to the first discharge current A flowing from the battery to the motor electric control module 102 when the battery is discharged D1 Effective value of (I) D1 And a second discharge current A flowing from the battery to the shunt assembly D2 Effective value of (I) D2 The sum of (a) and (b).
Wherein, a second discharge current A flows from the battery to the shunt assembly D2 Effective value of (I) D2 Can be zero, thus realizing the maximization of the energy storage of the motor electric control module when the battery discharges.
In yet another alternative embodiment, a rectifying element may be further disposed before the shunt assembly to adjust the current provided to the shunt assembly to the current profile required by the shunt assembly. Further optionally, the rectifying element may be included in a battery heating control system.
It should be noted that the heating efficiency when the heating film and the PTC liquid are heated in the prior art is usually 0.5 ℃/min, and the battery heating control system and the battery heating control method described in the present invention can greatly improve the heating efficiency of the battery, for example, can achieve the temperature rise target of 2 to 4 ℃/min. In addition, when the battery is self-heated, the heating efficiency can be further improved by providing the bias current to the shunt assembly compared with the case that the bias current is not provided to the shunt assembly, wherein the related experimental data are as follows:
pulse current (A) Bias current (A) Frequency (Hz) Initial temperature (. Degree. C.) of battery Temperature at which heating ended (. Degree.C.) Heating time (min) Average temperature rise Rate (. Degree. C./min)
260 0 500 -30 0 15 2
260 50 500 -30 0 10 4
Example four
Referring to fig. 5, fig. 5 is a schematic structural diagram of a main control module applied to a battery heating control system according to an embodiment of the present invention. The battery heating control system further comprises a motor electric control module, and further comprises a data acquisition module, wherein a control end of the data acquisition module is electrically connected with the main control module, a data acquisition end of the data acquisition module is used for being electrically connected with the battery, and the main control module is used for realizing heating control of the battery. As shown in fig. 5, the main control module may include:
a memory 401 storing executable program code;
a processor 402 coupled with the memory 401;
the processor 402 calls the executable program code stored in the memory 401 to execute some or all of the steps of the battery heating control method described in the second or third embodiment of the present invention.
EXAMPLE five
The embodiment of the invention discloses a battery or a battery pack, which can comprise a battery body and a battery heating control system, wherein the battery heating control system can be embodied as any one of the battery heating control systems described in the first embodiment.
EXAMPLE six
The embodiment of the invention discloses a computer storage medium, which stores computer instructions, and when the computer instructions are called, the computer storage medium is used for executing part or all of the steps in the battery heating control method described in the second embodiment or the third embodiment of the invention.
EXAMPLE seven
The embodiment of the invention discloses an electric automobile which can comprise an automobile body and a battery pack or a battery described in the fifth embodiment of the invention.
Example eight
The embodiment of the invention discloses electric equipment which can comprise an equipment body and a battery pack or a battery described in the fifth embodiment of the invention.
The above-described embodiments of the apparatus are merely illustrative, and the modules described as separate components may or may not be physically separate, and the components shown as modules may or may not be physical modules, may be located in one place, or may be distributed on a plurality of network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above detailed description of the embodiments, those skilled in the art will clearly understand that each embodiment may be implemented by software plus a necessary general hardware platform, and may also be implemented by hardware. With this understanding in mind, the above technical solutions may essentially or in part contribute to the prior art, be embodied in the form of a software product, which may be stored in a computer-readable storage medium, including a Read-Only Memory (ROM), a Random Access Memory (RAM), a Programmable Read-Only Memory (PROM), an Erasable Programmable Read-Only Memory (EPROM), a One-time Programmable Read-Only Memory (OTPROM), an electronically Erasable Programmable Read-Only Memory (EEPROM), an optical Disc-Read (CD-ROM) or other storage medium capable of storing data, a magnetic tape, or any other computer-readable medium capable of storing data.
Finally, it should be noted that: the single battery heating control method, the battery heating control system and the battery pack disclosed in the embodiments of the present invention are only preferred embodiments of the present invention, and are only used for illustrating the technical solutions of the present invention, rather than limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art; the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (19)

1. The utility model provides a battery heating control system, its characterized in that, battery heating control system includes host system and motor electrical control module, wherein:
the first input end of the motor electric control module is used for being electrically connected with the first output end of the battery, and the first output end of the motor electric control module is used for being electrically connected with the first input end of the battery; the main control module is respectively and electrically connected with the control end of the motor electric control module and the control end of the battery;
the main control module is used for controlling the motor electric control module to output charging current to the battery when the battery is charged and to be smaller than first discharging current output by the battery to the motor electric control module when the battery is discharged when the battery meets the predetermined heating condition.
2. The battery heating control system of claim 1, wherein the second output of the motor control module is configured to electrically connect to an input of a shunt assembly;
the main control module is further configured to control the motor electronic control module to output a bias current to the shunt assembly when the battery meets the predetermined heating condition and when the motor electronic control module is controlled to output the charging current to the battery.
3. The battery heating control system of claim 2, further comprising a data acquisition module;
the control end of the data acquisition module is electrically connected with the main control module, and the data acquisition end of the data acquisition module is used for being electrically connected with the battery;
the data acquisition module is used for acquiring current state information of the battery and providing the current state information to the main control module;
the main control module is further configured to receive the current state information reported by the data acquisition module, and determine whether the battery meets a predetermined heating condition according to the current state information.
4. The battery heating control system according to claim 3, wherein the main control module is further configured to receive real-time state information of the battery collected by the data collection module during the process of heating the battery, determine whether the real-time condition satisfies a bias current adjustment condition according to the real-time state information, and control the motor electronic control module to adjust the bias current provided to the shunt assembly when the motor electronic control module charges the battery if the determination result is yes; wherein the real-time status information at least includes real-time temperature information of the battery.
5. The battery heating control system of claim 3, wherein the current state information includes at least current temperature information of the battery;
the specific way that the main control module judges whether the battery meets the predetermined heating condition according to the current state information comprises the following steps:
and the main control module judges whether the temperature value corresponding to the current temperature information is lower than a predetermined temperature threshold value or not, and when the judgment result is yes, the battery is determined to meet the predetermined heating condition.
6. The battery heating control system of claim 5, wherein the current state information further includes current remaining power information of the battery;
the specific mode that the main control module judges whether the battery needs to be heated according to the current state information further comprises the following steps:
when the temperature value corresponding to the current temperature information is judged to be lower than the temperature threshold value, the main control module judges whether the residual electric quantity corresponding to the current residual electric quantity information meets a predetermined electric quantity condition, and when the residual electric quantity corresponding to the current residual electric quantity information meets the electric quantity condition, the operation of determining that the battery meets a predetermined heating condition is triggered; alternatively, the first and second liquid crystal display panels may be,
when the temperature value corresponding to the current temperature information is judged to be lower than the temperature threshold value, the main control module judges whether other power supplies exist for charging the battery at present, and when the other power supplies are judged to exist for charging the battery, the operation of determining that the battery meets the predetermined heating condition is triggered; alternatively, the first and second electrodes may be,
when the temperature value corresponding to the current temperature information is lower than the temperature threshold value, the main control module judges whether the residual electric quantity corresponding to the current residual electric quantity information meets a predetermined electric quantity condition, judges whether other power supplies exist currently to charge the battery when the residual electric quantity corresponding to the current residual electric quantity information does not meet the electric quantity condition, and triggers the operation of determining that the battery meets the predetermined heating condition when the other power supplies are judged to charge the battery.
7. The battery heating control system according to any one of claims 2 to 6, wherein a ratio of the effective value of the bias current to the effective value of the total discharge current output by the battery when discharging is in a range of 0.05 to 0.5;
wherein the effective value range of the total discharge current is 200 to 350A.
8. The battery heating control system according to any one of claims 2 to 6, wherein the main control module is further configured to control the battery to output a second discharge current to the shunt assembly when the battery is discharged;
wherein an effective value of a total discharge current output by the battery when discharging is equal to a sum of the effective value of the first discharge current and the effective value of the second discharge current;
and an effective value of the bias current is equal to a difference between an effective value of the first discharge current and an effective value of the charging current.
9. A battery pack, characterized in that the battery pack comprises a battery body and a battery heating control system according to any one of claims 1-8.
10. A battery heating control method is applied to a main control module included in a battery heating control system, the battery heating control system further comprises a motor electric control module, the main control module is used for realizing heating control of a battery, and the method comprises the following steps:
the main control module judges whether the battery meets a predetermined heating condition, and when the battery meets the predetermined heating condition, the main control module controls the battery to discharge in an orthogonal current electric time period, wherein when the battery discharges, the battery outputs a first discharge current to the motor electric control module;
in the negative alternating current time period after the end of the orthogonal current time period, the main control module controls the motor electric control module to output charging current to the battery, so that the battery is charged, wherein the charging current is smaller than the first discharging current.
11. The battery heating control method according to claim 10, further comprising:
when the battery meets the predetermined heating condition and controls the motor electric control module to output the charging current to the battery, the main control module controls the motor electric control module to output the bias current to a shunt assembly electrically connected with the motor electric control module.
12. The battery heating control method according to claim 11, wherein the battery heating control system further comprises a data acquisition module, a control end of the data acquisition module is electrically connected with the main control module, and a data acquisition end of the data acquisition module is used for being electrically connected with the battery;
wherein the method further comprises:
the main control module receives the current state information of the battery reported by the data acquisition module;
and the main control module judges whether the battery meets the predetermined heating condition, and the method comprises the following steps:
and the main control module judges that the battery meets the predetermined heating condition according to the current state information.
13. The battery heating control method according to claim 12, further comprising:
in the process of heating the battery, the main control module receives the real-time state information of the battery acquired by the data acquisition module, judges whether the real-time condition meets a bias current adjustment condition or not according to the real-time state information, and controls the motor electric control module to adjust the bias current provided for the shunt assembly when the motor electric control module charges the battery when the judgment result is yes; wherein the real-time status information at least includes real-time temperature information of the battery.
14. The battery heating control method according to claim 12, wherein the current state information includes at least current temperature information of the battery;
the main control module judges whether the battery meets the predetermined heating condition according to the current state information, and the method comprises the following steps:
the main control module judges whether the temperature value corresponding to the current temperature information is lower than a predetermined temperature threshold value or not, and when the judgment result is yes, the battery is determined to meet the predetermined heating condition.
15. The battery heating control method according to claim 14, wherein the current state information further includes current remaining capacity information of the battery;
wherein, the main control module judges whether the battery meets the predetermined heating condition according to the current state information, and the method further comprises the following steps:
when the temperature value corresponding to the current temperature information is judged to be lower than the temperature threshold value, the main control module judges whether the residual electric quantity corresponding to the current residual electric quantity information meets a predetermined electric quantity condition, and when the residual electric quantity corresponding to the current residual electric quantity information meets the electric quantity condition, the operation of determining that the battery meets a predetermined heating condition is triggered; alternatively, the first and second electrodes may be,
when the temperature value corresponding to the current temperature information is judged to be lower than the temperature threshold value, the main control module judges whether other power supplies exist for charging the battery at present, and when the other power supplies are judged to exist for charging the battery, the operation of determining that the battery meets the predetermined heating condition is triggered; alternatively, the first and second electrodes may be,
when the temperature value corresponding to the current temperature information is judged to be lower than the temperature threshold value, the main control module judges whether the residual capacity corresponding to the current residual capacity information meets a predetermined capacity condition, when the residual capacity corresponding to the current residual capacity information is judged to not meet the capacity condition, whether other power supplies are present for charging the battery is judged, and when the other power supplies are judged to be present for charging the battery, the operation of determining that the battery meets the predetermined heating condition is triggered.
16. The battery heating control method according to any one of claims 11 to 15, wherein a ratio of the effective value of the bias current to the effective value of the total discharge current output by the battery when discharging is in a range of 0.05 to 0.5;
wherein the effective value range of the total discharge current is 200 to 350A.
17. The battery heating control method according to any one of claims 11 to 15, further comprising:
when the battery is controlled to discharge, the main control module controls the battery to output a second discharge current to the shunt assembly;
wherein an effective value of a total discharge current output by the battery when discharging is equal to a sum of the effective value of the first discharge current and the effective value of the second discharge current;
and an effective value of the bias current is equal to a difference between an effective value of the first discharge current and an effective value of the charging current.
18. A computer storage medium storing computer instructions which, when invoked, perform a battery heating control method according to any one of claims 10 to 17.
19. An electric vehicle, characterized in that the electric vehicle comprises a vehicle body and the battery pack according to claim 9.
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Citations (9)

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