CN114709523A - Battery heating circuit and method, battery pack and vehicle - Google Patents

Battery heating circuit and method, battery pack and vehicle Download PDF

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Publication number
CN114709523A
CN114709523A CN202210395823.3A CN202210395823A CN114709523A CN 114709523 A CN114709523 A CN 114709523A CN 202210395823 A CN202210395823 A CN 202210395823A CN 114709523 A CN114709523 A CN 114709523A
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China
Prior art keywords
battery pack
battery
heating
temperature
control module
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Pending
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CN202210395823.3A
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Chinese (zh)
Inventor
何亚飞
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Envision Power Technology Jiangsu Co Ltd
Envision Ruitai Power Technology Shanghai Co Ltd
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Envision Power Technology Jiangsu Co Ltd
Envision Ruitai Power Technology Shanghai Co Ltd
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Priority to CN202210395823.3A priority Critical patent/CN114709523A/en
Publication of CN114709523A publication Critical patent/CN114709523A/en
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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
    • 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
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • 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
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H01M10/486—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring temperature
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • 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)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Automation & Control Theory (AREA)
  • Secondary Cells (AREA)
  • Battery Mounting, Suspending (AREA)

Abstract

The embodiment of the invention provides a battery heating circuit and method, a battery pack and a vehicle, and relates to the technical field of batteries. A battery heating circuit comprising: the heating control module, the switching circuit, the temperature acquisition device and the heating device; the heating control module is respectively electrically connected with the switch circuit and the temperature acquisition device; the heating device is electrically connected with the switch circuit, and the switch circuit is electrically connected with the battery pack; the temperature acquisition device is used for acquiring the temperature of each single battery cell in the battery pack; the heating control module is used for obtaining a target electric core which needs to be heated in the battery pack according to the current temperature of each single electric core in the battery pack; the heating control module is further used for controlling the switch circuit to conduct the heating device with each target electric core so as to heat each target electric core through the heating device. According to the invention, the single accurate heating control of the monomer battery cell in the battery pack is realized, and the heating balance control of the whole battery pack can be realized.

Description

Battery heating circuit and method, battery pack and vehicle
Technical Field
The invention relates to the technical field of batteries, in particular to a battery heating circuit and method, a battery pack and a vehicle.
Background
With the enhancement of environmental awareness of people, the market of new energy automobiles is continuously expanded, and the use scene of lithium batteries serving as the power core of the new energy automobiles is continuously expanded. The lithium battery has the advantages of long service life, large specific capacity, no memory effect and the like, but the lithium battery also has the problems of capacity reduction, serious attenuation, poor cycle rate performance, obvious lithium precipitation phenomenon, imbalance of lithium desorption and the like in a low-temperature environment.
In order to solve the problem of poor low-temperature performance of the lithium battery, the ambient temperature of the lithium battery is usually acquired, and when the ambient temperature is low, the heating device is utilized to integrally heat the lithium battery; but the problem of heating imbalance still exists.
Disclosure of Invention
The invention aims to provide a battery heating circuit and method, a battery pack and a vehicle, which realize the independent accurate heating control of a monomer battery core in a battery pack and can realize the integral heating balance control of the battery pack; in addition, the whole battery pack does not need to be heated, and the electric quantity consumption of the battery pack in the heating process is reduced.
To achieve the above object, the present invention provides a battery heating circuit, comprising: the heating control module, the switching circuit, the temperature acquisition device and the heating device; the heating control module is electrically connected with the switch circuit and the temperature acquisition device respectively; the heating device is electrically connected with the switch circuit, and the switch circuit is electrically connected with the battery pack; the temperature acquisition device is used for acquiring the temperature of each single battery cell in the battery pack; the heating control module is used for obtaining a target electric core which needs to be heated in the battery pack according to the current temperature of each single electric core in the battery pack; the heating control module is further configured to control the switch circuit to conduct the heating device with each target electric core, so as to heat each target electric core through the heating device.
The invention also provides a battery heating method, which is applied to a heating control module in the battery heating circuit; the heating circuit further comprises: the temperature control device comprises a switching circuit, a temperature acquisition device and a heating device; the heating control module is electrically connected with the switch circuit and the temperature acquisition device respectively; the heating device is electrically connected with the switch circuit, and the switch circuit is electrically connected with the battery pack; the method comprises the following steps: acquiring the current temperature of each single battery cell in the battery pack from the temperature acquisition device; obtaining a target battery cell to be heated in the battery pack according to the current temperature of each single battery cell in the battery pack; and controlling the switch circuit to conduct the heating device with each target battery cell so as to heat each target battery cell through the heating device.
The present invention also provides a battery pack, including: a battery pack and the battery heating circuit.
The present invention also provides a vehicle comprising: the battery pack is provided.
The battery heating circuit provided by the embodiment of the invention comprises: the heating control module can acquire the current temperature of each monomer cell in the battery pack through the temperature acquisition device, judge a target cell to be heated in the battery pack, and then control the switch circuit to conduct the heating device with each target cell, so that each target cell is heated through the heating device, and therefore the independent accurate heating control of the monomer cells in the battery pack is realized, and the overall heating balance control of the battery pack can be realized; in addition, the whole battery pack does not need to be heated, and the electric quantity consumption of the battery pack in the heating process is reduced.
In one embodiment, the heating control module is electrically connected to the battery pack; the heating control module is further used for collecting the voltage of each single battery cell in the battery pack; the heating control module is used for obtaining a target electric core which needs to be heated in the battery pack according to the current temperature and the current voltage of each single electric core in the battery pack.
In one embodiment, the heating control module is configured to acquire the single cells in the battery pack, where a current temperature of the single cells is less than or equal to a preset temperature threshold; the heating control module is used for selecting the monomer electric core with the current voltage within a preset voltage range from the monomer electric cores with the current temperature smaller than or equal to a preset temperature threshold value in the battery pack as the target electric core to be heated.
In one embodiment, the switching circuit includes a plurality of switching modules; the heating control modules are respectively connected to the control ends of the switch modules; each single battery cell in the battery pack corresponds to two switch modules; the anode and the cathode of each single battery cell are respectively connected to the heating device through two corresponding switch modules; the heating control module is used for controlling the conduction of the two switch modules corresponding to the target battery cells, and conducting the heating device and the target battery cells respectively so as to heat the target battery cells through the heating device.
In one embodiment, two adjacent single battery cells in the battery pack correspond to the same switch module.
In one embodiment, the temperature acquisition device includes a plurality of temperature sensors respectively electrically connected to the heating control module, the temperature sensors correspond to the single battery cells in the battery pack one by one, and each temperature sensor is disposed adjacent to the corresponding single battery cell; the temperature sensor is used for collecting the temperature of the corresponding single battery cell and sending the collected temperature to the heating control module.
In an embodiment, before obtaining, according to the current temperature of each individual battery cell in the battery pack, a target battery cell that needs to be heated in the battery pack, the method further includes: collecting the voltage of each single battery cell in the battery pack; the obtaining of the target electric core to be heated in the battery pack according to the current temperature of each single electric core in the battery pack includes: and obtaining a target electric core which needs to be heated in the battery pack according to the current temperature and the current voltage of each single electric core in the battery pack.
In one embodiment, the obtaining, according to the current temperature and the current voltage of each single battery cell in the battery pack, a target battery cell that needs to be heated in the battery pack includes: acquiring the single battery cells of which the current temperature is less than or equal to a preset temperature threshold in the battery pack; and selecting the monomer battery cell with the current voltage smaller than a preset voltage threshold value from the monomer battery cells with the current temperature smaller than or equal to the preset temperature threshold value in the battery pack as the target battery cell to be heated.
Drawings
FIG. 1 is a schematic diagram of a battery heating circuit according to a first embodiment of the present invention;
FIG. 2 is a schematic diagram of a battery heating circuit according to a second embodiment of the present invention;
fig. 3 is a detailed flowchart of a battery heating method according to a third embodiment of the present invention;
fig. 4 is a detailed flowchart of step 102 of the battery heating method of fig. 3.
Detailed Description
The embodiments of the present invention will be described in detail below with reference to the accompanying drawings in order to more clearly understand the objects, features and advantages of the present invention. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the present invention, but are merely intended to illustrate the spirit of the technical solution of the present invention.
In the following description, for the purposes of illustrating various disclosed embodiments, certain specific details are set forth in order to provide a thorough understanding of the various disclosed embodiments. One skilled in the relevant art will recognize, however, that the embodiments may be practiced without one or more of the specific details. In other instances, well-known devices, structures and techniques associated with this application may not be shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.
Throughout the specification and claims, the word "comprise" and variations thereof, such as "comprises" and "comprising," are to be understood as an open, inclusive meaning, i.e., as being interpreted to mean "including, but not limited to," unless the context requires otherwise.
Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
As used in this specification and the appended claims, the singular forms "a", "an", and "the" include plural referents unless the context clearly dictates otherwise. It should be noted that the term "or" is generally employed in its sense including "or/and" unless the context clearly dictates otherwise.
In the following description, for the purposes of clearly illustrating the structure and operation of the present invention, directional terms will be used, but terms such as "front", "rear", "left", "right", "outer", "inner", "outer", "inward", "upper", "lower", etc. should be construed as words of convenience and should not be construed as limiting terms.
The first embodiment of the invention relates to a battery heating circuit, which can be applied to a battery pack of an electric vehicle and is used for respectively heating and controlling each single battery cell of a battery pack in the battery pack so as to realize balanced heating of the whole battery pack.
Referring to fig. 1, the battery heating circuit includes: the heating control module 1 is electrically connected with the switch circuit 2 and the temperature acquisition device 3 respectively; the heating device 4 is electrically connected to the switch circuit 2, and the switch circuit 2 is electrically connected to the battery pack 5. In addition, the heating control module 1 may also be electrically connected to a battery pack 5, and the battery pack 5 includes a plurality of unit cells 51.
The temperature acquisition device 3 is used for acquiring the temperature of each single battery cell 51 in the battery pack 5. Specifically, the temperature collecting device 3 may be mounted outside or inside the battery pack 4, and is configured to collect the temperature of each unit cell 51 in the battery pack 5, and send the collected temperature of each unit cell 51 to the heating control module 1. The temperature acquisition device 3 may acquire the temperature in real time, or acquire the temperature when receiving an instruction sent by the heating control module 1, or periodically acquire the temperature.
The heating control module 1 is configured to obtain a target cell of the battery pack 5, which needs to be heated, according to the current temperature of each unit cell 51 in the battery pack 5. Specifically, the heating control module 1 may be a controller of a battery management system BMS in a vehicle, a preset temperature threshold is set in the heating control module 1, and when the temperature of the battery cell 51 is below the preset temperature threshold, the performance of the battery cell 51 is significantly reduced; therefore, the heating control module 1 acquires the unit cells 51 whose current temperatures are below the preset temperature threshold as the target cells to be heated, based on the acquired current temperatures of the respective unit cells 51 in the battery pack 5.
In one embodiment, the heating control module 1 is further configured to collect voltages of the individual battery cells 51 in the battery pack 5; therefore, the target battery cell in the battery pack 5 that needs to be heated can be obtained according to the current temperature and the current voltage of each single battery cell 51 in the battery pack 5. Specifically, the heating control module 1 may be connected to a positive electrode and a negative electrode (not shown in fig. 1) of each monomer electric core 51 in the battery pack 5, so as to collect voltages at two ends of each monomer electric core 51, and thus the heating control module 1 may comprehensively determine whether each monomer electric core 51 needs to be heated according to the current temperature and the current voltage of each monomer electric core 51, so as to obtain a target electric core that needs to be heated in the battery pack 5.
In one example, the heating control module 1 is configured to obtain the single battery cells 51 of which the current temperature is less than or equal to a preset temperature threshold in the battery pack 5; the heating control module 1 is configured to select a single battery cell 51 with a current voltage within a preset voltage range from the single battery cells 51 with a current temperature less than or equal to a preset temperature threshold in the battery pack 5 as a target battery cell to be heated. Specifically, a voltage range is also preset in the heating control module 1, and for each monomer battery cell 51, if the voltage of the monomer battery cell 51 is smaller than a lower limit value of the preset voltage range, it indicates that the current voltage of the monomer battery cell 51 is insufficient to support the pulse emission for charging and discharging self-heating; if the voltage of the single battery cell 51 is greater than the upper limit value of the preset voltage range, it indicates that the single battery cell 51 is too high, and at this time, the single battery cell 51 is used to generate pulse charge-discharge self-heating, which may cause the overcharge of the single battery cell 51 and cause a safety problem; therefore, the heating control module 1 selects the single battery cell 51 with the current temperature less than or equal to the preset temperature threshold from the plurality of single battery cells 51 included in the battery pack 5, and then selects the single battery cell 51 with the current voltage within the preset voltage range from the single battery cells 51 with the current temperature less than or equal to the preset temperature threshold as the target battery cell to be heated.
The heating control module 1 is further configured to control the switch circuit 2 to conduct the heating device 4 with each target electric core, so as to heat each target electric core through the heating device 4. Specifically, for each target battery cell that needs to be heated, the heating control module 1 may control the switch circuit 2 to sequentially switch on each target battery cell and the heating device 4, so that each target battery cell can be sequentially heated. When the heating control module 1 heats the target electric core, the temperature of the target electric core may be collected in real time through the temperature collecting device 3 to control the temperature of the heated target electric core, for example, after the target electric core is heated to a set temperature, the heating control module stops heating the target electric core.
In an example, the heating control module 1 may further obtain a current remaining capacity SOC of the battery pack 5, and if the current SOC of the battery pack 5 is within a preset electric quantity range, it is determined that the target electric core in the battery pack 5 may be heated; at this time, the heating control module 1 controls the switch circuit 2 to conduct the heating device 4 with each target cell, so as to heat each target cell through the heating device 4. If the current SOC of the battery pack 5 is not within the preset electric quantity range, it is determined that the individual electric cells 51 in the battery pack 5 may not be heated, a prompt message may be sent to prompt a user that heating is required, and when the current SOC of the battery pack 5 is within the preset electric quantity range, heating of each target electric cell is started.
The battery heating circuit provided by the embodiment comprises: the heating control module can acquire the current temperature of each monomer cell in the battery pack through the temperature acquisition device, judge a target cell to be heated in the battery pack, and then control the switch circuit to conduct the heating device with each target cell, so that each target cell is heated through the heating device, and therefore the independent accurate heating control of the monomer cells in the battery pack is realized, and the overall heating balance control of the battery pack can be realized; in addition, the whole battery pack does not need to be heated, and the electric quantity consumption of the battery pack in the heating process is reduced.
A second embodiment of the present invention relates to a battery heating circuit, and the second embodiment is mainly different from the first embodiment in that: the embodiment provides a specific structure of a switch circuit and a temperature acquisition device in a battery heating circuit.
Referring to fig. 2, the temperature acquisition device 3 of the battery heating circuit includes a plurality of temperature sensors 31 respectively electrically connected to the heating control module 1, the temperature sensors 31 correspond to the single battery cells 51 in the battery pack 5 one by one, and each temperature sensor 31 is disposed adjacent to the corresponding single battery cell 51. The temperature sensor 31 may be an NTC temperature sensor. A battery pack 5 comprising 5 individual cells is only schematically depicted in fig. 2. In one example, the temperature sensors 31 may be integrated in the battery pack 5, and each temperature sensor 31 is disposed in contact with a corresponding unit cell 51.
The temperature sensor 31 is configured to collect the temperature of the corresponding cell 51 and send the collected temperature to the heating control module 1.
The switching circuit 2 of the battery heating circuit comprises a plurality of switching modules 21; the heating control modules 1 are respectively connected with the control ends of the switch modules 21; the switch module 21 may be a MOS transistor switch.
Each unit cell 51 in the battery pack 5 corresponds to two switch modules 21; the positive electrode and the negative electrode of each single battery cell 51 are respectively connected to the heating device 4 through the corresponding two switch modules 21; that is, the positive electrode and the negative electrode of each unit cell 51 are respectively connected to one ends of the corresponding two switch modules 21, and the other ends of the two switch modules 21 are respectively connected to the heating device 4. In one example, two adjacent unit cells 51 in the battery pack 5 correspond to the same switch module 21, that is, the electrodes connected to the two adjacent unit cells 51 are connected to the heating device 4 through the same switch module 21.
The heating control module 1 is configured to control the two switch modules 21 corresponding to each target electric core to be turned on, and respectively turn on the heating device 4 and each target electric core, so as to heat each target electric core through the heating device 4.
For example, the heating device 4 may include at least one inductor, such as a vehicle motor (three-phase winding resistor) of the vehicle, which utilizes the characteristic of the inductor that can store and release energy; the positive pole and the negative pole of each monomer battery cell 51 are respectively connected to the two ends of the heating device 4 through the corresponding two switch modules 21, therefore, for each monomer battery cell 51, when the heating control module 1 needs to heat the monomer battery cell 51 (target battery cell), the two switch modules 21 connected to the unit battery cell 51 can be controlled to be switched on, at this moment, the monomer battery cell 51 and the heating device 4 send pulses to charge the inductor in the heating device 4, after the inductor in the heating device 4 is charged, the inductor discharges to charge the monomer battery cell 51, and a resistor exists inside the monomer battery cell 51, so that the monomer battery cell 51 can be heated in the charging and discharging process, and the self-heating of the monomer battery cell 51 is realized.
It should be noted that, if the heating device 4 only includes one inductor, each single battery cell 51 in the battery pack 5 is connected to the inductor, so that for a plurality of target battery cells that need to be heated, the heating control module 1 needs to control the plurality of target battery cells to be sequentially and individually connected to the inductor, and sequentially heat the plurality of target battery cells; or, the heating device 4 includes a plurality of inductors, the plurality of inductors correspond to the plurality of monomer electric cores 51 one to one, and each monomer electric core 51 in the battery pack 5 is connected to two corresponding inductor ends through the corresponding two switch modules 21, that is, two ends of each monomer electric core 51 are connected in parallel with one inductor, so that the heating control module 1 can control a plurality of target electric cores to be heated to be simultaneously connected with the plurality of corresponding inductors, and heat the plurality of target electric cores.
A third embodiment of the present invention relates to a battery heating method applied to a heating control module in the battery heating circuit in the first embodiment or the second embodiment. Please refer to fig. 1 and fig. 2 for the structure of the battery heating circuit.
The specific flow of the battery heating method of the present embodiment is shown in fig. 3.
Step 101, obtaining the current temperature of each single battery cell in the battery pack from a temperature acquisition device.
Specifically, the temperature acquisition device 3 may be mounted outside or inside the battery pack 4, and is configured to acquire the temperature of each unit cell 51 in the battery pack 5, and send the acquired temperature of each unit cell 51 to the heating control module 1.
Step 102, obtaining a target electric core which needs to be heated in the battery pack according to the current temperature of each single electric core in the battery pack.
Specifically, a preset temperature threshold is set in the heating control module 1, and when the temperature of the single battery cell 51 is below the preset temperature threshold, the performance of the single battery cell 51 is obviously reduced; therefore, the heating control module 1 acquires the unit cells 51 whose current temperatures are below the preset temperature threshold as the target cells to be heated, based on the acquired current temperatures of the respective unit cells 51 in the battery pack 5.
In one example, before obtaining a target cell in the battery pack that needs to be heated according to the current temperature of each single cell in the battery pack, the method further includes: and collecting the voltage of each single battery cell in the battery pack. At this time, step 102 obtains a target electric core that needs to be heated in the battery pack according to the current temperature of each single electric core in the battery pack, and includes: and obtaining a target battery cell to be heated in the battery pack according to the current temperature and the current voltage of each single battery cell in the battery pack.
In one example, referring to fig. 4, obtaining a target cell to be heated in a battery pack according to a current temperature and a current voltage of each single cell in the battery pack includes:
and a substep 1021, obtaining the single battery cells of which the current temperature is less than or equal to a preset temperature threshold value in the battery pack.
In sub-step 1022, a monomer electric core of which the current voltage is smaller than or equal to a preset voltage threshold is selected as a target electric core to be heated from monomer electric cores of which the current temperature is smaller than or equal to the preset temperature threshold in the battery pack.
Specifically, a voltage range is also preset in the heating control module 1, and for each single battery cell 51, if the voltage of the single battery cell 51 is smaller than a lower limit value of the preset voltage range, it indicates that the current voltage of the single battery cell 51 is insufficient to support the pulse self-heating for charging and discharging; if the voltage of the single battery cell 51 is greater than the upper limit value of the preset voltage range, it indicates that the single battery cell 51 is too high, and at this time, the single battery cell 51 is used to generate pulse charge-discharge self-heating, which may cause the overcharge of the single battery cell 51 and cause a safety problem; therefore, the heating control module 1 selects a single battery cell 51 with a current temperature less than or equal to the preset temperature threshold from the multiple single battery cells 51 included in the battery pack 5, and then selects a single battery cell 51 with a current voltage within the preset voltage range from the single battery cells 51 with the current temperature less than or equal to the preset temperature threshold as a target battery cell to be heated.
And 103, controlling the switch circuit to conduct the heating device with each target battery cell so as to heat each target battery cell through the heating device.
Specifically, for each target battery cell that needs to be heated, the heating control module 1 may control the switch circuit 2 to sequentially switch on each target battery cell and the heating device 4, so that each target battery cell can be sequentially heated. When the heating control module 1 heats the target electric core, the temperature of the target electric core may be collected in real time through the temperature collecting device 3 to control the temperature of the heated target electric core, for example, after the target electric core is heated to a set temperature, the heating control module stops heating the target electric core.
In an example, the heating control module 1 may further obtain a current remaining capacity SOC of the battery pack 5, and if the current SOC of the battery pack 5 is within a preset electric quantity range, it is determined that the target electric core in the battery pack 5 may be heated; at this time, the heating control module 1 controls the switch circuit 2 to conduct the heating device 4 with each target cell, so as to heat each target cell through the heating device 4. If the current SOC of the battery pack 5 is not within the preset electric quantity range, it is determined that the individual electric cells 51 in the battery pack 5 may not be heated, a prompt message may be sent to prompt a user that heating is required, and when the current SOC of the battery pack 5 is within the preset electric quantity range, heating of each target electric cell is started.
Since the first and second embodiments correspond to the present embodiment, the present embodiment can be implemented in cooperation with the first and second embodiments. The related technical details mentioned in the first embodiment and the second embodiment are still valid in this embodiment, and the technical effects achieved in the first embodiment and the second embodiment can also be achieved in this embodiment, and are not described herein again in order to reduce repetition. Accordingly, the related-art details mentioned in the present embodiment can also be applied to the first embodiment and the second embodiment.
In this embodiment, the heating control module can acquire the current temperature of each single battery cell in the battery pack through the temperature acquisition device, determine a target battery cell to be heated in the battery pack, and then control the switch circuit to conduct the heating device with each target battery cell, so as to heat each target battery cell through the heating device, thereby realizing the individual accurate heating control of the single battery cells in the battery pack, and being capable of performing the overall heating balance control of the battery pack; in addition, the whole battery pack does not need to be heated, and the electric quantity consumption of the battery pack in the heating process is reduced.
A fourth embodiment of the present invention relates to a battery pack that can be applied to an electric vehicle, the battery pack including the battery heating circuit and at least one battery pack of the first or second embodiment. In the battery pack, the battery heating circuit can respectively perform heating control on each single battery cell in each battery pack, so that the balanced heating of the whole battery pack is realized.
A fifth embodiment of the invention relates to a vehicle, such as an electric vehicle, including the battery pack of the fourth embodiment. It should be noted that the electric vehicle in this embodiment includes other necessary components of the electric vehicle besides the battery pack, and details are not repeated here.
While the preferred embodiments of the present invention have been described in detail above, it should be understood that aspects of the embodiments can be modified, if necessary, to employ aspects, features and concepts of the various patents, applications and publications to provide yet further embodiments.
These and other changes can be made to the embodiments in light of the above detailed description. In general, in the claims, the terms used should not be construed to be limited to the specific embodiments disclosed in the specification and the claims, but should be construed to include all possible embodiments along with the full scope of equivalents to which such claims are entitled.

Claims (11)

1. A battery heating circuit, comprising: the heating control module, the switching circuit, the temperature acquisition device and the heating device; the heating control module is electrically connected with the switch circuit and the temperature acquisition device respectively; the heating device is electrically connected with the switch circuit, and the switch circuit is electrically connected with the battery pack;
the temperature acquisition device is used for acquiring the temperature of each single battery cell in the battery pack;
the heating control module is used for obtaining a target electric core which needs to be heated in the battery pack according to the current temperature of each single electric core in the battery pack;
the heating control module is further configured to control the switch circuit to conduct the heating device with each target electric core, so as to heat each target electric core through the heating device.
2. The battery heating circuit of claim 1, wherein the heating control module is electrically connected to the battery pack;
the heating control module is further used for collecting the voltage of each single battery cell in the battery pack;
the heating control module is used for obtaining a target electric core which needs to be heated in the battery pack according to the current temperature and the current voltage of each single electric core in the battery pack.
3. The battery heating circuit of claim 2, wherein the heating control module is configured to obtain the cell in the battery pack for which a current temperature is less than or equal to a preset temperature threshold;
the heating control module is used for selecting the monomer electric core with the current voltage within a preset voltage range from the monomer electric cores with the current temperature smaller than or equal to a preset temperature threshold value in the battery pack as the target electric core to be heated.
4. The battery heating circuit of claim 1, wherein the switching circuit comprises a plurality of switching modules; the heating control modules are respectively connected to the control ends of the switch modules;
each single battery cell in the battery pack corresponds to two switch modules; the anode and the cathode of each single battery cell are respectively connected to the heating device through two corresponding switch modules;
the heating control module is used for controlling the conduction of the two switch modules corresponding to the target battery cells, and conducting the heating device and the target battery cells respectively so as to heat the target battery cells through the heating device.
5. The battery heating circuit of claim 4, wherein two adjacent single cells in the battery pack correspond to the same switch module.
6. The battery heating circuit of claim 1, wherein the temperature acquisition device comprises a plurality of temperature sensors electrically connected to the heating control module, respectively, the temperature sensors corresponding to the individual cells in the battery pack in a one-to-one manner, each temperature sensor being disposed adjacent to a corresponding individual cell;
the temperature sensor is used for collecting the temperature of the corresponding single battery cell and sending the collected temperature to the heating control module.
7. The battery heating method is characterized in that the battery heating method is applied to a heating control module in a battery heating circuit; the heating circuit further comprises: the temperature control device comprises a switching circuit, a temperature acquisition device and a heating device; the heating control module is electrically connected with the switch circuit and the temperature acquisition device respectively; the heating device is electrically connected with the switch circuit, and the switch circuit is electrically connected with the battery pack; the method comprises the following steps:
acquiring the current temperature of each single battery cell in the battery pack from the temperature acquisition device;
obtaining a target battery cell to be heated in the battery pack according to the current temperature of each single battery cell in the battery pack;
and controlling the switch circuit to conduct the heating device with each target battery cell so as to heat each target battery cell through the heating device.
8. The method of claim 7, before obtaining the target cell of the battery pack, which needs to be heated, according to the current temperature of each single cell in the battery pack, the method further includes:
collecting the voltage of each single battery cell in the battery pack;
the obtaining of the target electric core to be heated in the battery pack according to the current temperature of each single electric core in the battery pack includes:
and obtaining a target electric core which needs to be heated in the battery pack according to the current temperature and the current voltage of each single electric core in the battery pack.
9. The method of claim 8, wherein obtaining the target cell of the battery pack, which needs to be heated, according to the current temperature and the current voltage of each single cell in the battery pack comprises:
acquiring the single battery cells of which the current temperature is less than or equal to a preset temperature threshold value in the battery pack;
and selecting the monomer electric core with the current voltage smaller than a preset voltage threshold value from the monomer electric cores with the current temperature smaller than or equal to the preset temperature threshold value in the battery pack as the target electric core to be heated.
10. A battery pack, comprising: a battery pack and a battery heating circuit as claimed in any one of claims 1 to 6.
11. A vehicle, characterized by comprising: the battery pack according to claim 10.
CN202210395823.3A 2022-04-15 2022-04-15 Battery heating circuit and method, battery pack and vehicle Pending CN114709523A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210395823.3A CN114709523A (en) 2022-04-15 2022-04-15 Battery heating circuit and method, battery pack and vehicle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210395823.3A CN114709523A (en) 2022-04-15 2022-04-15 Battery heating circuit and method, battery pack and vehicle

Publications (1)

Publication Number Publication Date
CN114709523A true CN114709523A (en) 2022-07-05

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210395823.3A Pending CN114709523A (en) 2022-04-15 2022-04-15 Battery heating circuit and method, battery pack and vehicle

Country Status (1)

Country Link
CN (1) CN114709523A (en)

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