CN109301366A - Battery circuit and battery pack heating means - Google Patents
Battery circuit and battery pack heating means Download PDFInfo
- Publication number
- CN109301366A CN109301366A CN201811161726.8A CN201811161726A CN109301366A CN 109301366 A CN109301366 A CN 109301366A CN 201811161726 A CN201811161726 A CN 201811161726A CN 109301366 A CN109301366 A CN 109301366A
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- China
- Prior art keywords
- battery unit
- battery
- circuit
- voltage
- bidirectional
- Prior art date
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 26
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 48
- 238000006243 chemical reaction Methods 0.000 claims abstract description 46
- 230000005611 electricity Effects 0.000 claims description 19
- 238000005070 sampling Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 8
- 238000007599 discharging Methods 0.000 claims description 6
- 238000012544 monitoring process Methods 0.000 claims description 4
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 238000005485 electric heating Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000002269 spontaneous effect Effects 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
- H01M10/443—Methods for charging or discharging in response to 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
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
-
- 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
- H01M10/63—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
-
- 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 invention discloses a kind of battery circuit and battery pack heating means, circuit includes battery pack, including at least two battery units, Bidirectional up-down compresses switch circuit, and by inputting each other, the first input/output terminal of output end, the second input/output terminal be connected electrically between any two battery unit；Controller, it is electrically connected with the Bidirectional up-down circuit that compresses switch, for according to the temperature of battery pack control Bidirectional up-down compress switch circuit voltage conversion it is whether enabled and be that boost voltage conversion or step-down voltage are converted for controlling the Bidirectional up-down current voltage conversion of circuit that compresses switch, and the input and output direction for controlling voltage conversion.When battery pack temperature is lower than scheduled low temperature threshold, it can use the mutual charge and discharge in battery pack between each battery unit using the technical program and realize to battery heating, improve battery pack temperature.
Description
Technical field
The present invention relates to battery art, in particular to a kind of battery circuit and battery pack heating means.
Background technique
Its discharge capacity is substantially reduced lithium ion battery at low temperature.For example lithium ion battery is provided in current national standard
The lower limit temperature of electric discharge be defined as not less than -20 DEG C.
In order to improve the discharge performance of battery, when battery temperature is lower than scheduled lower limit temperature, need to battery temperature
It is promoted, universal lithium battery heating method is to be heated by way of plug-in adding thermal resistance on the market at present.
The shortcomings that this heating method of the prior art, mainly heats by outside inward, unevenly；In addition existing skill is used
Art needs are multiple to attach heating sheet in battery periphery, carries out electrical connection in parallel to heating sheet, certain to bringing in production and assembly
Trouble.
Summary of the invention
The first purpose of the embodiment of the present invention is to provide a kind of battery pack heating means, in battery pack temperature lower than predetermined
Low temperature threshold when, using the technical program can use the mutual charge and discharge in battery pack between each battery unit realize to electricity
Pond heating, improves battery pack temperature.
The second purpose of the embodiment of the present invention is to provide a kind of battery circuit, in battery pack temperature lower than scheduled low
When warm threshold value, it can use the realization of the mutual charge and discharge in battery pack between each battery unit using the technical program and battery added
Heat improves battery pack temperature.
In a first aspect, a kind of method of battery pack heating provided in an embodiment of the present invention,
When the temperature of battery pack is lower than scheduled low temperature threshold:
Be connected to Bidirectional up-down compress switch circuit the first input/output end side the first battery unit to the two-way liter
Step-down switching circuit input voltage, the Bidirectional up-down circuit that compresses switch convert input voltage into and are connected to the second input/defeated
After the charging voltage of second battery unit of outlet input, charge to second battery unit,
And/or
Second battery unit compresses switch circuit input voltage to the Bidirectional up-down, and the Bidirectional up-down presses off powered-down
After road converts input voltage into the charging voltage of first battery unit, charge to first battery unit；
When electric current flows through first battery unit, the second battery unit, first battery unit, the second battery unit
Internal resistance convert electrical energy into thermal energy.
Optionally, further includes:
According to the temperature of first battery unit, the second battery unit, and/or,
According to first battery unit, the voltage of the second battery unit, and/or,
According to first battery unit, the remaining capacity of the second battery unit,
Control the Bidirectional up-down compress switch circuit buck voltage conversion and the voltage conversion input and output
Direction.
Second aspect, a kind of battery circuit provided in an embodiment of the present invention, comprising:
Battery pack, including at least two battery units,
Bidirectional up-down compresses switch circuit, by inputting each other, the first input/output terminal of output end, the second input/output
End is connected electrically between any two battery unit；
Controller is electrically connected with the Bidirectional up-down circuit that compresses switch, for controlling institute according to the temperature of the battery pack
State Bidirectional up-down compress switch circuit voltage conversion it is whether enabled and current for controlling the Bidirectional up-down circuit that compresses switch
Voltage conversion be boost voltage conversion or step-down voltage conversion, and for control voltage conversion input and output direction.
Optionally, the controller is also electrically connected with voltage sampling circuit, and the voltage sampling circuit is described for monitoring
The voltage of first battery unit, the second battery unit；
The controller is used for the voltage also according to first battery unit, the second battery unit, controls described two-way
The voltage conversion enable end of buck switching circuit and the buck direction of voltage conversion.
Optionally, the controller is also electrically connected with current sampling circuit, and the current sampling circuit is described for monitoring
The charging and discharging currents of first battery unit, the second battery unit；
The controller is used for the charging and discharging currents also according to first battery unit, the second battery unit, determines institute
The remaining capacity for stating the first battery unit, the second battery unit, according to the residue of first battery unit, the second battery unit
Electricity, control the Bidirectional up-down compress switch circuit voltage conversion enable end and voltage conversion buck direction.
Therefore battery pack is utilized when the temperature of battery pack is lower than low temperature threshold using the present embodiment technical solution
The mutual charge and discharge of interior battery unit are mutually shifted by the electricity between battery unit each in battery pack, using in low temperature feelings
The biggish characteristic of the resistance of battery under condition, when electric current flows through in each battery unit, the internal resistance of each battery unit is by the electricity of battery
It can be converted into thermal energy, realize the self-heating of battery pack, to improve the temperature of battery pack.Pass through additional electric heating compared with the existing technology
The technical solution of piece, the present embodiment technical solution have the advantage that
Heat is distributed since the inside of battery each in battery pack, homogeneous heating.
Additional heating sheet is not necessarily to using this embodiment scheme, cost of implementation is lower.
Detailed description of the invention
The drawings described herein are used to provide a further understanding of the present invention, constitutes part of this application, not
Constitute inappropriate limitation of the present invention.
Fig. 1 is a kind of battery circuit schematic illustration with self-heating circuit that the embodiment of the present invention 1 provides；
Fig. 2 is a kind of battery circuit schematic illustration with self-heating circuit that the embodiment of the present invention 1 provides.
Specific embodiment
Below in conjunction with attached drawing and specific embodiment, the present invention will be described in detail, herein illustrative examples of the invention
And explanation is used to explain the present invention, but not as a limitation of the invention.
Embodiment 1
It is shown in Figure 1, a kind of battery circuit is present embodiments provided, which includes: battery pack, two-way
Buck switching circuit and controller.
Wherein battery pack is made of at least two battery units, wherein each battery unit can be battery cell, or
The battery pack being made of at least two battery cells.
Also, each battery unit in the embodiment of the present invention be not limited to it is certain identical, can also be mutually different.
The Bidirectional up-down of the present embodiment circuit that compresses switch includes the first input/output terminal, the second input/output terminal and setting
Set the voltage conversion circuit in the first input/output terminal, the second input/output terminal.
Wherein the first input/output terminal, the second input/output terminal wherein one end be input terminal when, the other end is as defeated
Both outlet can be used as output end or input terminal respectively, i.e., input/output terminal each other, such as:
When the first input/output terminal is as input terminal, the second input/output terminal is as output end；
When the second input/output terminal is as input terminal, the first input/output terminal is as output end.
The Bidirectional up-down circuit that compresses switch carries out voltage conversion under the control of switch control signal that controller issues, wherein electricity
Pressure conversion includes: boost in voltage conversion and voltage step-down conversion.
It may include one group in any battery pack to compress switch two battery lists of the mutual charge and discharge of circuit by Bidirectional up-down
Member, which also may include multiple groups, mutually resets the battery unit of electricity, any one group of mutual charge and discharge by the Bidirectional up-down circuit that compresses switch
The charge-discharge principle of two battery units of electricity is identical.
For convenience, below by any time, in any two battery unit of mutual charge and discharge with Bidirectional up-down pressure
Switching circuit the first input/output terminal electrical connection battery unit remember the first battery unit BT1, will wherein with Bidirectional up-down
The second battery unit BT2 that the second input/output terminal of circuit that compresses switch is electrically connected.
Controller is electrically connected with the Bidirectional up-down circuit that compresses switch, and is electrically connected with the compress switch enable end of circuit of Bidirectional up-down,
Carrying out voltage conversion makes can control, and when the temperature of battery pack is lower than scheduled low temperature threshold, control Bidirectional up-down presses off powered-down
Voltage conversion in road is enabled, and the control Bidirectional up-down current working condition that compresses switch is boost in voltage conversion or voltage step-down
Conversion and current voltage input outbound course.
Such as: when controller currently controls the first battery unit and charges to the second battery unit BT2:
If the voltage of current first battery unit BT1 is higher than the charging voltage of the second battery unit BT2, control two-way
The conversion of buck switching circuit current voltage is enabled, compresses switch circuit output control signal to Bidirectional up-down, and Bidirectional up-down presses off
Powered-down road is currently at step-down voltage conversion work circuit, voltage input outbound course are as follows: inputs from the first input/output terminal high
Voltage inputs the lower charging voltage for being suitble to charge to the second battery unit BT2 from the second input/output terminal, to the second electricity
Pool unit BT2 charging；
If the voltage of current first battery unit BT1 is lower than the charging voltage of the second battery unit BT2, control two-way
The conversion of buck switching circuit current voltage is enabled, compresses switch circuit output control signal to Bidirectional up-down, and Bidirectional up-down presses off
Powered-down road is currently at boost voltage conversion work circuit, voltage input outbound course are as follows: from the first input/output terminal input the
The voltage of one battery unit BT1 charges from the input of the second input/output terminal is higher suitable for the second battery unit BT2
Charging voltage, to the second battery unit BT2 charge；
Conversely, when controller currently controls the second battery unit BT2 and charges to the first battery unit BT1:
If the voltage of current second battery unit BT2 is higher than the charging voltage of the first battery unit BT1, control two-way
The conversion of buck switching circuit current voltage is enabled, compresses switch circuit output control signal to Bidirectional up-down, and Bidirectional up-down presses off
Powered-down road is currently at step-down voltage conversion work circuit, voltage input outbound course are as follows: inputs electricity from the second input/output terminal
The voltage for pressing the second higher battery unit BT2 is suitble to from the first input/output terminal input voltage is lower to the first battery
The charging voltage of unit B T1 charging, charges to the first battery unit BT1；
If the voltage of current second battery unit BT2 is lower than the charging voltage of the first battery unit BT1, control two-way
The conversion of buck switching circuit current voltage is enabled, compresses switch circuit output control signal to Bidirectional up-down, and Bidirectional up-down presses off
Powered-down road is currently at boost voltage conversion work circuit, voltage input outbound course are as follows: inputs electricity from the second input/output terminal
The voltage for pressing lower second battery unit BT2, it is higher suitable for the first electricity from the second input/output terminal input voltage
The charging voltage of pool unit BT1 charging, charges to the first battery unit BT1.
The present invention has found in carrying out the present embodiment research process, since at low temperatures, the internal resistance of battery is room temperature
Under the conditions of tens times of internal resistance, the present embodiment is mutually filled using the first battery unit BT1, the second battery unit BT2 of battery pack
Discharge process makes current flow through the first battery unit BT1, the second battery unit BT2, makes the first battery unit BT1, the second battery
The internal resistance of unit B T2 converts electrical energy into thermal energy, realizes battery pack self-heating.
Therefore battery pack is utilized when the temperature of battery pack is lower than low temperature threshold using the present embodiment technical solution
The mutual charge and discharge of interior battery unit are mutually shifted by the electricity between battery unit each in battery pack, using in low temperature feelings
The biggish characteristic of the resistance of battery under condition, when electric current flows through in each battery unit, the internal resistance of each battery unit is by the electricity of battery
It can be converted into thermal energy, realize the self-heating of battery pack, to improve the temperature of battery pack.Pass through additional electric heating compared with the existing technology
The technical solution of piece, the present embodiment technical solution have the advantage that
Heat is distributed since the inside of battery each in battery pack, homogeneous heating.
Additional heating sheet is not necessarily to using this embodiment scheme, cost of implementation is lower.
It should be noted that predetermined low temperature level threshold value of the invention can be currently used -20 DEG C, or other by
Designer is specifically not intended as the restriction of the present embodiment according to a low temperature threshold of actual set, such as -15 DEG C etc..
In the present embodiment, when the temperature of battery pack is lower than scheduled low temperature threshold, controller is according to preset
Battery pack self-heating strategy controls the mutual charge and discharge between each battery unit in battery pack.
Shown in Figure 2, as the signal of the present embodiment, controller also accesses each battery list of voltage sampling circuit input
The voltage of member, controller is also according to the voltage of each battery unit, when controlling the charge and discharge and charge and discharge between each battery unit
Between, so that the voltage between each battery unit is kept higher consistency.
Preferably, the battery unit of high voltage is made to be longer than lower voltage to the battery unit charging duration of lower voltage
Battery unit from battery unit to high voltage charging duration.It, can be using in battery pack using the present embodiment technical solution
Each mutual charge and discharge of battery unit convert electrical energy into thermal energy using its internal resistance, realize battery pack spontaneous heating, improve battery pack
Temperature, moreover it is possible to further increase the consistency of each battery unit in battery pack.
Shown in Figure 2, as the signal of the present embodiment, controller also accesses each battery list of current sampling circuit input
The charging and discharging currents signal of member, controller also according to each battery unit charging and discharging currents, calculating current to the integral of time, from
And the charge/discharge electricity amount of each battery unit is calculated, the remaining capacity of each battery unit is estimated according to the charge/discharge electricity amount of each battery,
The charge and discharge and charge and discharge duration between each battery unit are controlled according to its residual capacity.
Preferably, the charging duration that the more battery unit of remaining capacity charges to the less battery unit of remaining capacity is long
In the charging duration that the less battery unit of remaining capacity charges to the more battery unit of remaining capacity.Using the present embodiment skill
Art scheme can convert electrical energy into thermal energy using its internal resistance, realize electricity using each mutual charge and discharge of battery unit in battery pack
Pond group spontaneous heating, improves the temperature of battery pack, moreover it is possible to further increase the consistency of each battery unit in battery pack.
Fig. 1,2 compress switch one of circuit theory schematic diagram of circuit for a kind of Bidirectional up-down for providing of the present invention, control
Device processed compresses switch circuit input for controlling the output pulse width modulation of each switch S1, S2, S3, S4 respectively to Bidirectional up-down
(Pulse Width Modulation, abbreviation PWM) signal PWM1, PWM2, PWM3, PWM4, is compressed switch with controlling Bidirectional up-down
The input and output direction of boost conversion or step-down voltage conversion and voltage conversion when the current voltage of circuit is converted.
The Bidirectional up-down of the present embodiment circuit that compresses switch is not limited to Fig. 1, shown in 2, can also use the prior art its
The Bidirectional up-down of his topological structure compresses switch circuit.This will not be repeated here.
As the signal of the present embodiment, the present embodiment be can be, but not limited to using inductance as accumulator L.It is described above
Embodiment, do not constitute the restriction to the technical solution protection scope.Any spirit and principle in above embodiment
Within made modifications, equivalent substitutions and improvements etc., should be included in the protection scope of the technical scheme.
Claims (5)
1. a kind of method of battery pack heating, characterized in that include:
When the temperature of battery pack is lower than scheduled low temperature threshold:
Be connected to Bidirectional up-down compress switch circuit the first input/output end side the first battery unit to the Bidirectional up-down pressure
Switching circuit input voltage, the Bidirectional up-down circuit that compresses switch convert input voltage into and are connected to the second input/output terminal
After the charging voltage of second battery unit of input, charge to second battery unit,
And/or
Second battery unit compresses switch circuit input voltage to the Bidirectional up-down, and the Bidirectional up-down compresses switch circuit will
After input voltage is converted to the charging voltage of first battery unit, charge to first battery unit；
When electric current flows through first battery unit, the second battery unit, first battery unit, the second battery unit it is interior
Resistance converts electrical energy into thermal energy.
2. the method for battery pack heating according to claim 1, characterized in that further include:
According to the temperature of first battery unit, the second battery unit, and/or,
According to first battery unit, the voltage of the second battery unit, and/or,
According to first battery unit, the remaining capacity of the second battery unit,
Control the Bidirectional up-down compress switch circuit buck voltage conversion and the voltage conversion input and output side
To.
3. a kind of battery circuit, characterized in that include:
Battery pack, including at least two battery units,
Bidirectional up-down compresses switch circuit, by inputting each other, the first input/output terminal of output end, the second input/output terminal electricity
It is connected between any two battery unit；
Controller is electrically connected with the Bidirectional up-down circuit that compresses switch, for described double according to the control of the temperature of the battery pack
It is whether enabled to the conversion of the voltage of buck switching circuit and compress switch the current electricity of circuit for controlling the Bidirectional up-down
Pressure conversion is boost voltage conversion or step-down voltage conversion, and the input and output direction for controlling voltage conversion.
4. a kind of battery circuit according to claim 3, characterized in that
The controller is also electrically connected with voltage sampling circuit, and the voltage sampling circuit is for monitoring the first battery list
The voltage of member, the second battery unit；
The controller is used for the voltage also according to first battery unit, the second battery unit, controls the Bidirectional up-down
Compress switch the voltage conversion enable end of circuit and the buck direction of voltage conversion.
5. a kind of battery circuit according to claim 3, characterized in that
The controller is also electrically connected with current sampling circuit, and the current sampling circuit is for monitoring the first battery list
The charging and discharging currents of member, the second battery unit；
The controller is used for the charging and discharging currents also according to first battery unit, the second battery unit, determines described the
The remaining capacity of one battery unit, the second battery unit, according to first battery unit, the residue electricity of the second battery unit
Amount, control the Bidirectional up-down compress switch circuit voltage conversion enable end and voltage conversion buck direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811161726.8A CN109301366B (en) | 2018-09-30 | 2018-09-30 | Battery pack circuit and battery pack heating method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811161726.8A CN109301366B (en) | 2018-09-30 | 2018-09-30 | Battery pack circuit and battery pack heating method |
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| CN109301366A true CN109301366A (en) | 2019-02-01 |
| CN109301366B CN109301366B (en) | 2024-06-04 |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109950660A (en) * | 2019-03-25 | 2019-06-28 | 清华大学 | The method that ternary lithium-ion-power cell is preheated using itself energy storage excitation |
| CN109950661A (en) * | 2019-03-25 | 2019-06-28 | 清华大学 | A kind of device and method that the inside and outside of power battery pack is heated simultaneously |
| CN111029667A (en) * | 2019-11-08 | 2020-04-17 | 华为技术有限公司 | Battery heating system, electric automobile and on-vehicle system |
| CN112550064A (en) * | 2020-11-12 | 2021-03-26 | 华为技术有限公司 | DC/DC converter, heating method of power battery pack and electric vehicle |
| CN113809765A (en) * | 2021-09-16 | 2021-12-17 | 远景能源有限公司 | Energy storage system and self-heating method |
| CN113871757A (en) * | 2020-06-30 | 2021-12-31 | 比亚迪股份有限公司 | Battery heating system and battery heating method thereof |
| CN115366750A (en) * | 2021-12-27 | 2022-11-22 | 宁德时代新能源科技股份有限公司 | Battery heating control method and device and electronic equipment |
| WO2023110725A1 (en) * | 2021-12-17 | 2023-06-22 | Vitesco Technologies GmbH | Method and apparatus to operate a battery unit |
| WO2023123445A1 (en) * | 2021-12-31 | 2023-07-06 | 宁德时代新能源科技股份有限公司 | Battery heating system and method, power supply system, and electrical device |
| CN116505139A (en) * | 2023-06-30 | 2023-07-28 | 宁德时代新能源科技股份有限公司 | Battery heating control method and device, electronic equipment and battery heating circuit |
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