CN116526018A - Heating device of battery module and battery module - Google Patents

Heating device of battery module and battery module Download PDF

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Publication number
CN116526018A
CN116526018A CN202310340722.0A CN202310340722A CN116526018A CN 116526018 A CN116526018 A CN 116526018A CN 202310340722 A CN202310340722 A CN 202310340722A CN 116526018 A CN116526018 A CN 116526018A
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China
Prior art keywords
module
resistor
switch
voltage
unit
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Pending
Application number
CN202310340722.0A
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Chinese (zh)
Inventor
张行
林镇煌
陈海森
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Xiamen Kehua Digital Energy Tech Co Ltd
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Xiamen Kehua Digital Energy Tech Co Ltd
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Priority to CN202310340722.0A priority Critical patent/CN116526018A/en
Publication of CN116526018A publication Critical patent/CN116526018A/en
Pending legal-status Critical Current

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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
    • H01M10/44—Methods for charging or discharging
    • 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
    • H01M10/63—Control systems
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/657—Means for temperature control structurally associated with the cells by electric or electromagnetic means
    • H01M10/6571—Resistive heaters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/007188—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters
    • H02J7/007192—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature
    • H02J7/007194—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature of the battery
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
    • H02M3/1582—Buck-boost converters
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/02—Details
    • 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)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Automation & Control Theory (AREA)
  • Secondary Cells (AREA)

Abstract

The invention provides a heating device of a battery module and the battery module, wherein the heating device comprises: the device comprises a heating circuit, a first switch module, a driving isolation module and a control module; the control module is used for outputting a high-level control signal when the temperature of the battery pack is monitored to be smaller than the preset temperature, and outputting a low-level control signal when the temperature of the battery pack is monitored to be larger than or equal to the preset temperature; the first switch module is turned on when the control signal is in a high level, and turned off when the control signal is in a low level; the heating circuit heats the battery pack when the first switch module is conducted, through the structure, the application can take electricity from the high-voltage side of the LLC resonant conversion circuit of the battery module, and the heating circuit heats the battery pack when the temperature of the battery pack is too low, so that the cost can be saved, and the safe and stable operation of the battery pack can be ensured.

Description

Heating device of battery module and battery module
Technical Field
The present invention relates to the field of battery technologies, and in particular, to a heating device for a battery module and a battery module.
Background
When the battery is applied to various fields, problems of low capacity, serious electric quantity attenuation, poor cycle rate performance and the like can be generated when the temperature of the battery is too low, so that the charge and discharge performance of the battery is damaged, and the service life of the battery is influenced.
Therefore, how to solve the above problems is a research direction for those skilled in the art.
Disclosure of Invention
In view of the above, the present invention provides a heating device for a battery module and a battery module, which can solve the problem of performance/life damage caused by too low battery temperature in the prior art.
In a first aspect, an embodiment of the present invention provides a heating device for a battery module, where the battery module includes a battery pack and a dc conversion device, and the dc conversion device includes an LLC resonant conversion circuit; the heating device includes:
the device comprises a heating circuit, a first switch module, a driving isolation module and a control module;
the first end of the heating circuit is connected with the high-voltage side of the LLC resonant conversion circuit, the second end of the heating circuit is connected with the first end of the first switch module, and the second end of the first switch module is grounded; the control module is connected with the control end of the first switch module through the driving isolation module;
the control module is used for outputting a high-level control signal when the temperature of the battery pack is monitored to be smaller than a preset temperature, and outputting a low-level control signal when the temperature of the battery pack is monitored to be larger than or equal to the preset temperature;
the first switch module is turned on when the control signal is in a high level, and turned off when the control signal is in a low level; the heating circuit heats the battery pack when the first switch module is turned on.
In one possible implementation, the heating circuit includes a first resistance wire and a second resistance wire;
the first end of the first resistance wire and the first end of the second resistance wire are respectively connected with the first end of the heating circuit, and the second end of the first resistance wire and the second end of the second resistance wire are respectively connected with the second end of the heating circuit.
In one possible implementation, the control module is further configured to:
acquiring the voltage at two ends of the first switch module when a control signal with a high level is output, and taking the voltage as a first sampling voltage;
acquiring the voltage at two ends of the first switch module when a control signal with low level is output, and taking the voltage as a second sampling voltage;
and if the first sampling voltage is the same as the second sampling voltage, controlling the direct current conversion device to be closed.
In one possible implementation, the heating device further includes a voltage sampling module; the voltage sampling module comprises a first resistance unit and a second resistance unit;
the first end of the first resistor unit is connected with the first end of the first switch module, the second end of the first resistor unit is connected with the negative electrode output end of the voltage sampling module, the first end of the second resistor unit is connected with the second end of the first switch module, the second end of the second resistor unit is connected with the positive electrode output end of the voltage sampling module, and the positive electrode output end and the negative electrode output end of the voltage sampling module are connected with the control module.
In one possible implementation, the first switch module includes a first switch unit and a first switch control unit;
the first switch control unit is conducted based on the high-level control signal; and converting the power supply voltage into a first voltage, the first switching unit being turned on when the first voltage is received.
In one possible implementation manner, the first switch control unit includes a first switch tube, a second switch tube, a first RC unit, a first resistor, a second resistor, a third resistor, and a fourth resistor; the first switch unit comprises a third switch tube, a second RC unit and a fifth resistor;
the first end of the first resistor is connected with the control end of the first switch control unit, the second end of the first resistor is connected with the first end of the first RC unit and the base electrode of the first switch tube, the second end of the first RC unit, the emitter of the first switch tube and the first end of the second resistor are grounded, the collector of the first switch tube is connected with the first end of the third resistor and the first end of the fourth resistor respectively, the second end of the third resistor is connected with the base electrode of the second switch tube, the second end of the fourth resistor and the emitter of the second switch tube are connected with a power supply respectively, the collector of the second switch tube is connected with the second end of the second resistor and the first end of the fifth resistor respectively, the second end of the fifth resistor is connected with the first end of the second RC unit and the grid electrode of the third switch tube respectively, the drain of the third switch tube is connected with the first end of the first switch tube and the second end of the second switch tube respectively.
In one possible implementation manner, the control module is specifically configured to:
and when the battery module is in a charging mode and the temperature of the battery pack is smaller than a preset temperature, outputting a high-level control signal.
In one possible implementation manner, the control module is specifically configured to:
and outputting a low-level control signal when the battery module is in a discharging mode or the temperature of the battery pack is greater than or equal to a preset temperature.
In one possible implementation, the battery pack is connected to a common dc bus of a power supply system through the dc conversion device;
the control module is used for outputting a high-level control signal when the battery module is in a charging mode, the temperature of the battery pack is smaller than a preset temperature, and the voltage of the common direct current bus is in a preset voltage range.
In a second aspect, embodiments of the present invention provide a battery module comprising a heating device according to any of the first aspects above.
Compared with the prior art, the embodiment of the invention has the beneficial effects that:
the heating device provided by the embodiment of the invention comprises a heating circuit, a first switch module, a driving isolation module and a control module; the control module is used for outputting a high-level control signal when the temperature of the battery pack is monitored to be smaller than a preset temperature, and outputting a low-level control signal when the temperature of the battery pack is monitored to be larger than or equal to the preset temperature; the first switch module is turned on when the control signal is in a high level, and turned off when the control signal is in a low level; the heating circuit heats the battery pack when the first switch module is conducted, through the structure, the embodiment can take electricity from the high-voltage side of the LLC resonant conversion circuit, and heat the battery pack when the temperature of the battery pack is too low, so that the cost can be saved, and the safe and stable operation of the battery pack can be ensured.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural view of a heating device of a battery module according to an embodiment of the present invention;
fig. 2 is a circuit schematic diagram of a heating device of a battery module according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the following description will be made by way of specific embodiments with reference to the accompanying drawings.
Referring to fig. 1, a schematic structural diagram of a heating device of a battery module according to an embodiment of the present invention is shown, and the details are as follows:
the battery module comprises a battery pack and a direct current conversion device, wherein the direct current conversion device comprises an LLC resonant conversion circuit; the heating device includes:
the device comprises a heating circuit 10, a first switch module 20, a driving isolation module 30 and a control module 40;
a first end of the heating circuit 10 is connected with a high-voltage side of the LLC resonant conversion circuit, a second end of the heating circuit 10 is connected with a first end of the first switch module 20, and a second end of the first switch module 20 is grounded; the control module 40 is connected with the control end of the first switch module 20 through the driving isolation module 30;
the control module 40 is configured to output a high-level control signal when the temperature of the battery pack is monitored to be less than a preset temperature, and output a low-level control signal when the temperature of the battery pack is monitored to be greater than or equal to the preset temperature;
the first switch module 20 is turned on when the control signal is at a high level and turned off when the control signal is at a low level; the heat generating circuit 10 heats the battery pack when the first switch module 20 is turned on.
Specifically, the battery module related to the embodiment is applied to a battery system, as shown in fig. 1, the battery module includes a battery pack and a dc conversion device, the dc conversion device includes a BUCK-BOOST circuit and an LLC resonant conversion circuit, an output end of the battery pack is connected with a first end of the BUCK-BOOST circuit, a second end of the BUCK-BOOST circuit is connected with a low-voltage side of the LLC resonant conversion circuit, a high-voltage side of the LLC resonant conversion circuit is used for connecting a common dc bus of a power supply system, the power supply system may further include a photovoltaic module connected with the common dc bus, and the common dc bus can be connected to a power grid through an inverter module. In this way, the battery module, the photovoltaic module and the power grid can then be energy exchanged based on the power supply system.
Specifically, the heating circuit 10 is connected to the high voltage side of the LLC resonant conversion circuit, referring to fig. 2, the LLC resonant conversion circuit includes a low voltage side switching unit a10, an LLC resonant cavity a20, and a high voltage side switching unit a30, and the heating circuit 10 is connected to the output end of the high voltage side switching unit a30 of the LLC resonant conversion circuit, and because the power supply voltage of the heating device is high, the control module 40 outputs a high level or low level control signal to the first switching module 20 through the driving isolation module 30 to control the on and off of the first switching module 20, thereby controlling the heating circuit 10 to start or stop working. The control module 40 may be a BMS (Battery Management System ) of the battery module or a chip for separately controlling the heating device.
Specifically, in order to avoid the influence of the low-temperature environment on the service life or performance of the battery, when the temperature of the battery pack is lower than a preset temperature, the heating circuit is controlled to be started, wherein the preset temperature can be set to be 0 ℃, and safe and stable operation of the battery module in a proper temperature range is ensured.
In a possible implementation manner, fig. 2 shows a schematic circuit diagram of the heating device provided in this embodiment, and referring to fig. 2, the heating circuit 10 includes a first resistance wire R1 and a second resistance wire R2;
the first end of the first resistance wire R1 and the first end of the second resistance wire R2 are respectively connected with the first end of the heating circuit 10, and the second end of the first resistance wire R1 and the second end of the second resistance wire R2 are respectively connected with the second end of the heating circuit 10.
According to the embodiment, the two resistance wires connected in parallel are arranged, so that the problem that the heating device fails due to the fact that the resistance wires are blown can be avoided.
In one possible implementation, the control module is further configured to:
acquiring the voltage at two ends of the first switch module when a control signal with a high level is output, and taking the voltage as a first sampling voltage;
acquiring the voltage at two ends of the first switch module when a control signal with low level is output, and taking the voltage as a second sampling voltage;
and if the first sampling voltage is the same as the second sampling voltage, controlling the direct current conversion device to be closed.
In this embodiment, when the first switch module is broken down, the first switch module is continuously turned on, so as to avoid the problem that the battery pack is continuously heated due to continuous conduction after the first switch module fails, the control module may output a low-level control signal every preset time after the heating device is turned on, collect the voltage at two ends of the first switch module under the low-level control signal and the voltage at two ends of the first switch module under the high-level control signal by the voltage sampling module, and take the voltage at two ends of the first switch module under the high-level control signal as a first sampling voltage, and take the voltage at two ends of the first switch module under the low-level control signal as a second sampling voltage. If the first sampling voltage is low and the second sampling voltage is high, the first switch module is normal; if the first sampling voltage is the same as the second sampling voltage, the first switch module is invalid, the direct-current conversion device is required to be closed at the moment, the heating device cannot take power from the high-voltage side of the LLC resonant conversion circuit of the direct-current conversion device, and the heating device is closed in a power failure.
According to the method, the heating device can be turned off when the first switch module fails, so that the heating device is prevented from continuously heating the battery pack, and safe operation of the battery module is ensured.
In one possible implementation, the heating device further includes a voltage sampling module; the voltage sampling module comprises a first resistance unit and a second resistance unit;
the first end of the first resistor unit is connected with the first end of the first switch module 20, the second end of the first resistor unit is connected with the negative electrode output end of the voltage sampling module, the first end of the second resistor unit is connected with the second end of the first switch module 20, the second end of the second resistor unit is connected with the positive electrode output end of the voltage sampling module, and the positive electrode output end and the negative electrode output end of the voltage sampling module are connected with the control module 40.
In this embodiment, the first resistance unit and the second resistance unit each include at least one resistor, and when the resistors are at least two, the resistors in the same resistance unit are connected in series.
Illustratively, as shown in fig. 2, the first resistive unit includes resistors R10 and R11, and R10 and R11 are connected in series, and the second resistive unit includes resistors R12 and R13, and R12 and R13 are connected in series.
In one possible implementation, the first switch module 20 includes a first switch unit and a first switch control unit;
the first switch control unit is conducted based on the high-level control signal; and converting the power supply voltage into a first voltage, the first switching unit being turned on when the first voltage is received.
In one possible implementation manner, the first switch control unit includes a first switch tube Q1, a second switch tube Q2, a first RC unit, a first resistor R3, a second resistor R7, a third resistor R6, and a fourth resistor R5; the first switch unit comprises a third switch tube Q3, a second RC unit and a fifth resistor R8;
the first end of the first resistor R3 is connected with the control end of the first switch control unit, the second end of the first resistor R3 is connected with the first end of the first RC unit and the base of the first switch tube Q1, the second end of the first RC unit, the emitter of the first switch tube Q1 and the first end of the second resistor R7 are grounded, the collector of the first switch tube Q1 is connected with the first end of the third resistor R6 and the first end of the fourth resistor R5, the second end of the third resistor R6 is connected with the base of the second switch tube Q2, the second end of the fourth resistor R5 and the emitter of the second switch tube Q2 are connected with the power supply, the collector of the second switch tube Q2 is connected with the second end of the second resistor R7 and the first end of the fifth resistor R8, the second end of the fifth resistor R8 is connected with the second end of the second switch tube Q3, and the drain of the third switch tube Q3 are connected with the first end of the second switch tube Q3.
In this embodiment, as shown in fig. 2, the first RC unit includes a resistor R4 and a capacitor C1, and the resistor R4 and the capacitor C1 are connected in parallel. The second RC unit includes a resistor R9 and a capacitor C2, and the resistor R9 and the capacitor C2 are connected in parallel.
In one possible implementation, the control module 40 is specifically configured to:
and when the battery module is in a charging mode and the temperature of the battery pack is smaller than a preset temperature, outputting a high-level control signal.
In one possible implementation, the control module 40 is specifically configured to:
and outputting a low-level control signal when the battery module is in a discharging mode or the temperature of the battery pack is greater than or equal to a preset temperature.
In this embodiment, considering that the environmental temperature range in which the battery module operates is-20 ℃ to 50 ℃ under normal conditions, the battery can normally operate in the foregoing temperature range (-20 ℃ -50 ℃) when in the discharging mode, so that in order to save cost, in this embodiment, the operating mode of the battery is obtained in addition to the low temperature determination by obtaining the temperature of the battery, and the heating device is started to heat the battery pack only when the battery module is in the charging mode and the temperature thereof is lower than the preset temperature.
In one possible implementation, the battery pack is connected to a common dc bus of a power supply system through the dc conversion device;
the control module 40 has a function for outputting a control signal of a high level when the battery module is in a charging mode, the temperature of the battery pack is less than a preset temperature, and the common dc bus voltage is in a preset voltage range.
In this embodiment, since the common dc bus voltage of the power supply system is within the rated operating range, the smooth start of the heating circuit can be ensured, so the control module 40 of this embodiment further obtains the common dc bus voltage of the power supply system, and when the common dc bus voltage of the power supply system is within the preset voltage range, and the battery module is in the charging mode and the temperature of the battery pack is lower than the preset temperature, the control module 40 outputs a high-level control signal to ensure the smooth start of the heating device, and avoid the forced start of the heating device from affecting the original operation of the power supply system.
In one possible embodiment, the control module outputs a low level control signal to turn off the heating device when it detects that the battery pack has failed.
The embodiment of the invention provides a battery module, which comprises the heating device.
As can be seen from the above embodiments, the heating device provided in this embodiment can take electricity from the high voltage side of the dc conversion device, so as to reduce battery pack consumption, and heat the battery pack when the temperature of the battery pack is too low, and timely close the dc conversion device when the first switch module 20 breaks down, to cut off the electricity taken by the heating device, so as to avoid the risk of continuous heating caused by failure of the switch module, and to ensure safe and stable operation of the battery pack.
The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention, and are intended to be included in the scope of the present invention.

Claims (10)

1. A heating device of a battery module, the battery module comprising a battery pack and a dc conversion device, the dc conversion device comprising an LLC resonant conversion circuit; characterized in that the heating device comprises:
the device comprises a heating circuit, a first switch module, a driving isolation module and a control module;
the first end of the heating circuit is connected with the high-voltage side of the LLC resonant conversion circuit, the second end of the heating circuit is connected with the first end of the first switch module, and the second end of the first switch module is grounded; the control module is connected with the control end of the first switch module through the driving isolation module;
the control module is used for outputting a high-level control signal when the temperature of the battery pack is monitored to be smaller than a preset temperature, and outputting a low-level control signal when the temperature of the battery pack is monitored to be larger than or equal to the preset temperature;
the first switch module is turned on when the control signal is in a high level, and turned off when the control signal is in a low level; the heating circuit heats the battery pack when the first switch module is turned on.
2. The heating device of a battery module of claim 1, wherein the heat generating circuit comprises a first resistance wire and a second resistance wire;
the first end of the first resistance wire and the first end of the second resistance wire are respectively connected with the first end of the heating circuit, and the second end of the first resistance wire and the second end of the second resistance wire are respectively connected with the second end of the heating circuit.
3. The heating device of a battery module of claim 1, wherein the control module is further configured to:
acquiring the voltage at two ends of the first switch module when a control signal with a high level is output, and taking the voltage as a first sampling voltage;
acquiring the voltage at two ends of the first switch module when a control signal with low level is output, and taking the voltage as a second sampling voltage;
and if the first sampling voltage is the same as the second sampling voltage, controlling the direct current conversion device to be closed.
4. The heating device of a battery module of claim 3, wherein the heating device further comprises a voltage sampling module; the voltage sampling module comprises a first resistance unit and a second resistance unit;
the first end of the first resistor unit is connected with the first end of the first switch module, the second end of the first resistor unit is connected with the negative electrode output end of the voltage sampling module, the first end of the second resistor unit is connected with the second end of the first switch module, the second end of the second resistor unit is connected with the positive electrode output end of the voltage sampling module, and the positive electrode output end and the negative electrode output end of the voltage sampling module are connected with the control module.
5. The heating device of a battery module according to claim 1, wherein the first switch module includes a first switch unit and a first switch control unit;
the first switch control unit is conducted based on the high-level control signal; and converting the power supply voltage into a first voltage, the first switching unit being turned on when the first voltage is received.
6. The heating device of the battery module according to claim 5, wherein the first switching control unit includes a first switching tube, a second switching tube, a first RC unit, a first resistor, a second resistor, a third resistor, and a fourth resistor; the first switch unit comprises a third switch tube, a second RC unit and a fifth resistor;
the first end of the first resistor is connected with the control end of the first switch control unit, the second end of the first resistor is connected with the first end of the first RC unit and the base electrode of the first switch tube, the second end of the first RC unit, the emitter of the first switch tube and the first end of the second resistor are grounded, the collector of the first switch tube is connected with the first end of the third resistor and the first end of the fourth resistor respectively, the second end of the third resistor is connected with the base electrode of the second switch tube, the second end of the fourth resistor and the emitter of the second switch tube are connected with a power supply respectively, the collector of the second switch tube is connected with the second end of the second resistor and the first end of the fifth resistor respectively, the second end of the fifth resistor is connected with the first end of the second RC unit and the grid electrode of the third switch tube respectively, the drain of the third switch tube is connected with the first end of the first switch tube and the second end of the second switch tube respectively.
7. The heating device of a battery module according to claim 1, wherein the control module is specifically configured to:
and when the battery module is in a charging mode and the temperature of the battery pack is smaller than a preset temperature, outputting a high-level control signal.
8. The heating device of a battery module according to claim 1, wherein the control module is specifically configured to:
and outputting a low-level control signal when the battery module is in a discharging mode or the temperature of the battery pack is greater than or equal to a preset temperature.
9. The heating device of a battery module according to claim 1, wherein the battery pack is connected to a common dc bus of a power supply system through the dc conversion device;
the control module is used for outputting a high-level control signal when the battery module is in a charging mode, the temperature of the battery pack is smaller than a preset temperature, and the voltage of the common direct current bus is in a preset voltage range.
10. A battery module comprising a heating device according to any one of claims 1 to 9.
CN202310340722.0A 2023-03-31 2023-03-31 Heating device of battery module and battery module Pending CN116526018A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN118472494A (en) * 2024-07-12 2024-08-09 荣耀终端有限公司 Electronic equipment, control method thereof and charging system
CN118472494B (en) * 2024-07-12 2024-11-19 荣耀终端有限公司 Electronic equipment, control method thereof and charging system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN118472494A (en) * 2024-07-12 2024-08-09 荣耀终端有限公司 Electronic equipment, control method thereof and charging system
CN118472494B (en) * 2024-07-12 2024-11-19 荣耀终端有限公司 Electronic equipment, control method thereof and charging system

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