CN112186307A - Lithium battery heating device and heating method - Google Patents
Lithium battery heating device and heating method Download PDFInfo
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- CN112186307A CN112186307A CN202011210791.2A CN202011210791A CN112186307A CN 112186307 A CN112186307 A CN 112186307A CN 202011210791 A CN202011210791 A CN 202011210791A CN 112186307 A CN112186307 A CN 112186307A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/615—Heating or keeping warm
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/63—Control systems
- H01M10/635—Control systems based on ambient temperature
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- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The application discloses lithium cell heating device and heating method, the device includes: the system comprises a battery management system, a self-heating power converter and a lithium battery; the lithium battery and the self-heating power converter are both connected with the battery management system, and the self-heating power converter is connected with the lithium battery in a closed loop manner; the battery management system is used for detecting the temperature of the lithium battery, generating a first signal according to the detected temperature and sending the first signal to the self-heating power converter; the self-heating power converter is used for forming alternating current charging and discharging current on the lithium battery according to the first signal so as to heat the lithium battery. Therefore, the method provided by the application uses the heat effect when the alternating current charging and discharging current passes through the internal resistance of the lithium battery to directly heat the lithium battery, solves the problem of overlarge energy loss in the heat transfer process, and improves the heating efficiency of the lithium battery.
Description
Technical Field
The application relates to the field of batteries, in particular to a lithium battery heating device and a heating method.
Background
With the gradual development of the application technology of the lithium battery, the lithium battery is widely applied to the fields of electric rail transit, electric automobiles and aerospace due to the fact that the energy density of the lithium battery is higher than that of other energy storage modes. The lithium battery has the advantages of high power density, good safety, long service life and the like, but the output power of the lithium battery is easily limited by temperature. For example, the peak power of the lithium battery at a temperature below-10 ℃ is attenuated to 60% of the peak power at normal temperature, so that the lithium battery cannot be directly and normally started in a low-temperature environment, and the battery needs to be heated to a certain temperature.
At present, the method for heating the battery is mainly to arrange a heating resistor specially used for heating the lithium battery near the lithium battery to be heated. However, the heat transfer efficiency from the heating resistor to the lithium battery is low, and the loss in the heat transfer process is large, so that the heating effect is poor.
Disclosure of Invention
In order to solve the technical problem, the application provides a lithium battery heating device and a heating method for heating a lithium battery at a low temperature so as to improve the heating efficiency of the lithium battery.
In order to achieve the above purpose, the technical solutions provided in the embodiments of the present application are as follows:
the embodiment of the application provides a lithium cell heating device, its characterized in that, the device includes:
the system comprises a battery management system, a self-heating power converter and a lithium battery;
the lithium battery and the self-heating power converter are both connected with the battery management system, and the self-heating power converter is connected with the lithium battery in a closed loop manner;
the battery management system is used for detecting the temperature of the lithium battery, generating a first signal according to the detected temperature and sending the first signal to the self-heating power converter;
the self-heating power converter is used for forming alternating current charging and discharging current on the lithium battery according to the first signal so as to heat the lithium battery.
Optionally, the self-heating power converter comprises:
the circuit comprises N full-bridge circuits and N groups of inductance elements, wherein each full-bridge circuit corresponds to one group of inductance elements, and each group of inductance elements comprises 2 inductance elements; each full-bridge circuit comprises 4 MOS tubes; n is an integer greater than 1;
2 inductive elements included in a group of inductive elements corresponding to one full-bridge circuit are respectively positioned on 2 power supply diagonal lines of the full-bridge circuit.
Optionally, the full-bridge circuit includes 4 bridge arms, and each bridge arm includes 1 MOS transistor.
Optionally, the 2 inductive elements comprise a first inductive element and a second inductive element; the 4 MOS tubes comprise: the MOS transistor comprises a first MOS transistor, a second MOS transistor, a third MOS transistor and a fourth MOS transistor;
the first MOS tube, the second MOS tube and the first inductance element form a regulating circuit; the third MOS tube, the fourth MOS tube and the second inductance element form another regulating circuit; the two regulating circuits are symmetrical to each other and are used for generating currents with opposite direct current components and superposed alternating current components.
Optionally, the self-heating power converter is specifically configured to heat the lithium battery with a fixed-frequency control strategy.
Optionally, the self-heating power converter is specifically configured to control heating of the lithium battery at a fixed frequency; the fixed frequency is higher than 10 kHz.
Optionally, the forming an alternating charging and discharging current on the lithium battery according to the first signal includes:
and adjusting the duty ratio of an MOS (metal oxide semiconductor) tube on the bridge arm of the full-bridge circuit according to the first signal so as to adjust the amplitude of the alternating-current charging and discharging current.
Optionally, the battery management system is specifically configured to:
when the temperature of the lithium battery is detected to be lower than a first temperature threshold value, generating a first signal for starting the self-heating power converter;
in the process of heating the lithium battery, when the temperature of the lithium battery is detected to be higher than a second temperature threshold value, generating a first signal for turning off the self-heating power converter; the first temperature threshold is less than the second temperature threshold.
Optionally, the battery management system is further configured to:
detecting whether the lithium battery meets charge and discharge conditions; and if the charging and discharging conditions are met, generating a first signal according to the detected temperature.
Optionally, the method further comprises:
a current sensor and/or a voltage sensor communicatively coupled to the battery management system;
the current sensor is used for measuring the current of the lithium battery and sending the current to the battery management system;
and the voltage sensor is used for measuring the voltage of the lithium battery and sending the voltage to the battery management system.
Optionally, applied to a self-heating power converter, the method comprises:
receiving a first signal sent by a battery management system, wherein the first signal is a signal generated according to the temperature of a lithium battery;
and according to the first signal, alternating current charging and discharging current is formed on the lithium battery so as to heat the lithium battery.
Optionally, the forming, according to the first signal, an alternating charging and discharging current on the lithium battery to heat the lithium battery includes:
and according to the first signal, alternating current charging and discharging current is formed on the lithium battery, and the lithium battery is heated by a fixed frequency control strategy.
According to the technical scheme, the method has the following beneficial effects:
the embodiment of the application provides a lithium cell heating device, includes: the system comprises a battery management system, a self-heating power converter and a lithium battery; the lithium battery and the self-heating power converter are both connected with the battery management system, and the self-heating power converter is connected with the lithium battery in a closed loop manner; the battery management system is used for detecting the temperature of the lithium battery, generating a first signal according to the detected temperature and sending the first signal to the self-heating power converter; the self-heating power converter is used for forming alternating current charging and discharging current on the lithium battery according to the first signal so as to heat the lithium battery. According to the method, the lithium battery is directly heated by using the heat effect when the alternating current charging and discharging current passes through the internal resistance of the lithium battery, so that the problem of overlarge energy loss in the heat transfer process is solved, and the heating efficiency of the lithium battery is improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a lithium battery heating device according to an embodiment of the present disclosure;
fig. 2 is a schematic diagram of a self-heating power converter including a full-bridge circuit and a set of inductive elements according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a self-heating power converter including a plurality of full-bridge circuits and a plurality of sets of inductive elements according to an embodiment of the present application;
fig. 4 is a schematic flow chart of a lithium battery heating method according to an embodiment of the present application.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the drawings are described in detail below.
As described above, the heating resistor dedicated to heating the lithium battery is provided near the lithium battery to be heated. However, the heat transfer efficiency from the heating resistor to the lithium battery is low, the loss in the heat transfer process is large, and the heating effect is poor.
In the technical scheme that this application provided, the thermal effect when flowing through the internal resistance of lithium cell through the electric current carries out direct heating to the lithium cell, can improve the heating efficiency of lithium cell. The method avoids energy loss in the heat transfer process when the battery is heated by using an additional heating resistor.
When the internal resistance of the lithium battery is heated, the internal resistance of the lithium battery is smaller, so that the heating power of the lithium battery is limited by the internal resistance of the lithium battery. The alternating current internal resistance of lithium cell is far greater than direct current internal resistance, adopts alternating current charge-discharge current to heat the lithium cell among this application technical scheme, and heating power is bigger, and efficiency is higher.
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
First embodiment
Referring to fig. 1, the drawing is a schematic structural diagram of a lithium battery heating device provided in an embodiment of the present application.
As shown in fig. 1, a lithium battery heating apparatus provided in an embodiment of the present application includes:
In the embodiment of the present application, the lithium battery 100 may refer to one lithium battery 100, or may refer to a battery module including a plurality of lithium batteries 100 connected in series. As an example, the lithium battery 100 may include a lithium titanate battery 100, which has a large power influence by temperature, or other lithium batteries 100, which have a large power influence by temperature.
The lithium battery 100 and the self-heating power converter 200 are both connected with the battery management system 300, and the self-heating power converter 200 is connected with the lithium battery 100 in a closed loop.
It should be noted that, in the embodiment of the present application, the self-heating power converter 200 is connected to the lithium battery 100 in a closed loop, which means that, as shown in fig. 1, two ends of the self-heating power converter 200 are connected to two ends of the lithium battery 100 to form a complete current closed loop. It should be further noted that, in the embodiment of the present application, the circuit formed by the closed-loop connection of the self-heating power converter 200 and the lithium battery 100 is a heating circuit for heating the lithium battery 100 in the present application. The lithium battery 100 is connected to the battery management system 300 so that the battery management system 300 obtains the temperature of the lithium battery 100. The self-heating power converter 200 is connected to the battery management system 300 so that the battery management system 300 controls the self-heating power converter 200.
Specifically, the battery management system 300 is configured to detect a temperature of the lithium battery 100, generate a first signal according to the detected temperature, and transmit the first signal to the self-heating power converter 200.
As a possible implementation, the battery management system 300 is specifically configured to: the temperature of the lithium battery 100 is detected, a first signal is generated according to the detected temperature, and the first signal is transmitted to the self-heating power converter 200.
During the detection process, specifically, when the temperature of the lithium battery 100 is lower than a first temperature threshold, a first signal for starting the self-heating power converter 200 is generated; generating a first signal to turn off the self-heating power converter 200 when the temperature of the lithium battery 100 is higher than a second temperature threshold; the first temperature threshold is less than the second temperature threshold; the first signal is sent to the self-heating power converter 200. In the battery management system 300 according to the embodiment of the application, after the self-heating power converter 200 starts heating, the temperature of the lithium battery 100 is still detected, and a first signal with a turn-off instruction is sent to the self-heating power converter 200 until the temperature of the lithium battery 100 reaches a second temperature threshold. It should be noted that, in the embodiment of the present application, the second temperature threshold may be adaptively set according to different types and different application scenarios of the lithium battery 100, where the first temperature threshold and the second temperature threshold of the lithium battery 100 are set. For a portion of the lithium battery 100, the second temperature threshold for the same lithium battery 100 will be greater than the first temperature threshold for the lithium battery 100. As an example, the first temperature threshold of the lithium battery 100 may be 0 degrees celsius and the second temperature threshold may be 5 degrees celsius. It should be noted that, in the embodiment of the present application, the first temperature threshold is the lowest operating temperature of the lithium battery 100, and when the temperature of the lithium battery 100 is lower than the first temperature threshold, it is difficult to meet the normal discharge power requirement; the second temperature threshold is a heating-off temperature of the lithium battery 100, and when the temperature of the lithium battery 100 is higher than the second temperature threshold, the discharge power of the lithium battery, which is attenuated by the temperature, is substantially recovered.
In order to heat the battery more flexibly, as a possible implementation manner, if the detected temperature does not reach the first temperature threshold of the lithium battery 100, a specific first signal may be generated according to the current temperature of the lithium battery 100, and the signal includes the target power of the self-heating power converter 200. The temperature rise rate requirements for lithium batteries may vary at different temperatures. For example, at lower temperatures, a higher target power may be set; at higher temperatures, a lower target power may be set. In the embodiment of the present application, a mapping relationship between the temperature of the lithium battery 100 and the target power of the self-heating power converter 200 may be pre-established, and according to the mapping relationship, the target power of the lithium battery heating apparatus provided in the embodiment of the present application is adaptively adjusted along with the temperature change of the lithium battery 100.
The self-heating power converter 200 provided in the embodiment of the present application may not include a power source, but use the lithium battery 100 to be heated as a power source for heating. In order to avoid that the lithium battery 100 to be heated does not have enough heating power or the lithium battery 100 does not satisfy other conditions of charging and discharging, as a possible implementation manner, the battery management system 300 provided in the present application may be further configured to detect whether the lithium battery 100 satisfies charging and discharging conditions; and if the charging and discharging conditions are met, generating a first signal according to the detected temperature. As a possible embodiment, the charge and discharge condition may include that the lithium battery 100 does not have a fault and/or that the voltage value of the lithium battery satisfies a preset condition. Specifically, the preset condition may include that the voltage value of the lithium battery is within a preset charging and discharging interval, and the voltage difference between two adjacent lithium batteries in the same group is greater than a preset voltage difference.
The self-heating power converter 200 is configured to generate an ac charging/discharging current on the lithium battery 100 according to the first signal to heat the lithium battery 100. It can be understood that the self-heating power converter 200 of the present application adjusts the amplitude of the ac charging/discharging current formed on the lithium battery 100 by receiving the first signal transmitted by the battery management system 300, thereby adjusting the heating power of the lithium battery heating apparatus.
In order to verify the efficiency of heating, guarantee the security of heating battery, the lithium cell heating device that this application embodiment provided still includes: a current sensor and/or a voltage sensor communicatively coupled to the battery management system 300; the current sensor is used for measuring the current of the lithium battery 100 and sending the current to the battery management system; the voltage sensor is used for measuring the voltage of the lithium battery 100 and sending the voltage to the battery management system. It is understood that the voltage sensor and the current sensor in the embodiment of the present application are used to measure the voltage and the current of the lithium battery 100 to be heated. After receiving the measurement signals of the voltage sensor and the current sensor, the battery management system 300 determines whether the heating current of the lithium battery 100 to be heated is normal according to the measurement signals, so as to avoid the situations of battery damage and the like caused by the circuit failure.
As can be seen from the above, the apparatus provided by the present application includes a battery management system 300, a self-heating power converter 200, and a lithium battery 100. The battery management system 300 is configured to detect a temperature of the lithium battery 100, generate a first signal according to the detected temperature, and transmit the first signal to the self-heating power converter 200. The self-heating power converter 200 is configured to generate an ac charging/discharging current on the lithium battery 100 according to the first signal to heat the lithium battery 100. Therefore, the apparatus provided in the embodiment of the present application heats the lithium battery 100 to be heated by forming the alternating charging and discharging current with the amplitude varying with the temperature on the lithium battery 100 to be heated. So, carry out direct heating to lithium cell 100, solve the too big problem of energy loss among the heat transfer process to the heating efficiency of lithium cell 100 has been improved.
The following describes an implementation of the self-heating power converter in the lithium battery heating apparatus with reference to the drawings.
The self-heating power converter that this application embodiment provided includes:
the circuit comprises N full-bridge circuits and N groups of inductance elements, wherein each full-bridge circuit corresponds to one group of inductance elements, and each group of inductance elements comprises 2 inductance elements; each full-bridge circuit comprises 4 MOS tubes; n is an integer greater than 1.
For convenience of description, the present application is first described with reference to a self-heating power converter including a full-bridge circuit and a set of inductive elements corresponding to the full-bridge circuit:
referring to fig. 2, a block diagram of a self-heating power converter including a full-bridge circuit and a set of inductive elements is provided according to an embodiment of the present application.
Divided from the composition structure, the self-heating power converter provided by the embodiment of the application comprises: a full bridge circuit and a set of inductive elements. As shown in fig. 2, in the embodiment of the present application, the 2 inductance elements include a first inductance element L1 and a second inductance element L2; 4 MOS pipes include: first MOS transistor S1A second MOS transistor S2And the third MOS transistor S3And a fourth MOS transistor S4。
In the embodiment of the present application, 2 inductance elements L1 and L2 included in a set of inductance elements corresponding to a full bridge circuit are located on 2 power supply diagonals of the full bridge circuit, respectively. The full-bridge circuit comprises 4 bridge arms, and each bridge arm comprises 1 MOS tube. As shown in FIG. 2, the MOS transistors are the first MOS transistor S on the first bridge arm1And a second MOS transistor S on the second bridge arm2A third MOS transistor S on the third bridge arm3And a fourth MOS transistor S on the fourth bridge arm4。
Functionally, the self-heating power converter provided by the embodiment of the application comprises two regulating circuits. As shown in fig. 2, the first MOS transistor S1A second MOS transistor S2And the first inductance element L1 form a regulation circuit; third MOS transistor S3And the fourth MOS transistor S4And the second inductive element L2 form another regulating circuit.
As a possible implementation manner, in the embodiment of the present application, two regulating circuits are symmetrical to each other, and are used for generating currents with opposite direct current components and superposed alternating current components. It should be noted that, the symmetry of the two regulating circuits refers to the first MOS transistor S in the first regulating circuit1A second MOS transistor S2And a first inductance element L1, and a third MOS transistor S in the second regulating circuit3And the fourth MOS transistor S4Symmetrical to the second inductive element L2. I.e. the first MOS transistor S1And a fourth MOS transistor S4Is an identical MOS transistor, a second MOS transistor S2And a third MOS transistor S3The first inductance element L1 and the second inductance element L2 are identical inductance elements, which are identical MOS transistors.
It can be understood that, the present application makes the first regulating circuit and the second regulating circuit completely symmetrical, so that the first regulating circuit and the second regulating circuit respectively generate the first current i with opposite direct current components and superposed alternating current componentsB1And a second current iB2. First current i with opposite DC components and superposed AC componentsB1And a second current iB2In a lithium battery vB1And the direct current components of the charging circuit where the lithium battery is positioned are mutually offset, and the alternating current components are superposed to generate complete alternating current charging and discharging current. Therefore, the alternating current heating function of the lithium battery to be heated can be realized.
According to the first embodiment, the self-heating power converter provided in the embodiment of the present application may form ac charging and discharging currents with different amplitudes according to the first signal sent by the battery management system 300. In the embodiment of the present application, forming an ac charging/discharging current on a lithium battery according to a first signal includes: and adjusting the duty ratio of the MOS tube on the bridge arm of the full-bridge circuit according to the first signal so as to adjust the amplitude of the alternating current charging and discharging current. When the temperature of the battery changes, the duty ratio of the MOS tube adjusted according to the first signal can also be changed. Specifically, the higher the duty ratio, the larger the amplitude of the alternating charging and discharging current generated by the self-heating power converter, and thus the higher the heating efficiency of the lithium battery to be heated, the faster the heating speed. As an example, the amplitude of the current generated by the self-heating power converter may be I-T K, where I is the amplitude of the current, T is the temperature of the lithium battery, and K is the heating coefficient, and in particular K may be related to the ambient temperature of the lithium battery, the power of the self-heating power converter.
The circuit of self-heating power converter that this application provided also can use frequency conversion control strategy to adjust heating power, however, frequency conversion control strategy duty cycle is fixed 0.5, can't produce the heating current of different amplitudes, uses comparatively to limit. As a possible implementation, the self-heating power converter provided by the present application is specifically used for heating a lithium battery with a fixed-frequency control strategy. In particular, the self-heating power converter is particularly used for controlling the heating of a lithium battery at a fixed frequency. As an example, the fixed frequency is higher than 10 kHz. The fixed frequency is a frequency at which an ac charging/discharging current for heating the lithium battery is fixed.
In practical application, there may be a plurality of lithium batteries to be heated, and in order to heat a plurality of lithium batteries simultaneously, the embodiment of the present application further provides a self-heating power converter including a plurality of full-bridge circuits and a plurality of sets of inductance elements corresponding to the full-bridge circuits.
Referring to fig. 3, a diagram of a self-heating power converter including a plurality of full-bridge circuits and a plurality of sets of inductive elements according to an embodiment of the present application is shown. As shown in fig. 3, the sub-modules of the self-heating power converter, which are composed of a full-bridge circuit and a set of inductive elements, are represented in the dashed box. A plurality of submodules are combined together according to the structure shown in fig. 3, so as to form the self-heating power converter composed of a plurality of full-bridge circuits and a plurality of sets of inductive elements provided by the embodiment of the application.
It should be noted that the non-isolated self-heating power converter provided in the embodiments of the present application has no isolation element between the sub-modules. However, the self-heating power converter provided by the present application is not limited to the non-isolated self-heating power converter, and an isolation element may be added between the submodules of the self-heating power converter.
Therefore, according to the device provided by the embodiment of the application, the self-heating power converter composed of 4 MOS tubes and 2 inductance elements is used for forming alternating current charging and discharging current on the lithium battery to be heated, so that the lithium battery to be heated is heated. Therefore, the characteristic of large alternating internal resistance of the lithium battery is utilized, and the heating efficiency of the lithium battery is improved. In addition, the device that this application provided can also heat a plurality of lithium cells.
Second embodiment
According to the device provided by the application, the embodiment of the application also provides a lithium battery heating method.
Referring to fig. 4, the figure is a schematic flow chart of a lithium battery heating method provided in the embodiment of the present application.
As shown in fig. 4, a lithium battery heating method provided in an embodiment of the present application includes: receiving a first signal sent by the battery management system 300, wherein the first signal is a signal generated according to the temperature of the lithium battery; according to the first signal, alternating current charging and discharging current is formed on the lithium battery so as to heat the lithium battery.
As a possible embodiment, according to the first signal, an alternating charging and discharging current is formed on the lithium battery to heat the lithium battery, including:
and according to the first signal, forming alternating current charging and discharging current on the lithium battery, and heating the lithium battery by a fixed frequency control strategy.
As can be seen from the above, in the method provided in the embodiment of the present application, the alternating charging and discharging current is formed on the lithium battery by receiving the signal generated according to the temperature of the lithium battery and sent by the battery management system 300, so as to heat the lithium battery.
As can be seen from the above description of the embodiments, those skilled in the art can clearly understand that all or part of the steps in the above embodiment methods can be implemented by software plus a necessary general hardware platform. Based on such understanding, the technical solution of the present application may be essentially or partially implemented in the form of a software product, which may be stored in a storage medium, such as a ROM/RAM, a magnetic disk, an optical disk, etc., and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network communication device such as a media gateway, etc.) to execute the method according to the embodiments or some parts of the embodiments of the present application.
It should be noted that, in the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. The method disclosed by the embodiment corresponds to the system disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the system part for description.
It should also be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (12)
1. A lithium battery heating apparatus, characterized in that the apparatus comprises:
the system comprises a battery management system, a self-heating power converter and a lithium battery;
the lithium battery and the self-heating power converter are both connected with the battery management system, and the self-heating power converter is connected with the lithium battery in a closed loop manner;
the battery management system is used for detecting the temperature of the lithium battery, generating a first signal according to the detected temperature and sending the first signal to the self-heating power converter;
the self-heating power converter is used for forming alternating current charging and discharging current on the lithium battery according to the first signal so as to heat the lithium battery.
2. The apparatus of claim 1, wherein the self-heating power converter comprises:
the circuit comprises N full-bridge circuits and N groups of inductance elements, wherein each full-bridge circuit corresponds to one group of inductance elements, and each group of inductance elements comprises 2 inductance elements; each full-bridge circuit comprises 4 MOS tubes; n is an integer greater than 1;
2 inductive elements included in a group of inductive elements corresponding to one full-bridge circuit are respectively positioned on 2 power supply diagonal lines of the full-bridge circuit.
3. The apparatus of claim 2, wherein the full bridge circuit comprises 4 bridge arms, and each bridge arm comprises 1 MOS transistor.
4. The apparatus of claim 2, wherein the 2 inductive elements comprise a first inductive element and a second inductive element; the 4 MOS tubes comprise: the MOS transistor comprises a first MOS transistor, a second MOS transistor, a third MOS transistor and a fourth MOS transistor;
the first MOS tube, the second MOS tube and the first inductance element form a regulating circuit; the third MOS tube, the fourth MOS tube and the second inductance element form another regulating circuit; the two regulating circuits are symmetrical to each other and are used for generating currents with opposite direct current components and superposed alternating current components.
5. The device according to claim 1, wherein the self-heating power converter is specifically adapted for heating the lithium battery with a fixed frequency control strategy.
6. The device according to claim 5, wherein the self-heating power converter is specifically configured to control heating of the lithium battery at a fixed frequency; the fixed frequency is higher than 10 kHz.
7. The apparatus of claim 2, wherein said forming an alternating charging and discharging current on said lithium battery based on said first signal comprises:
and adjusting the duty ratio of an MOS (metal oxide semiconductor) tube on the bridge arm of the full-bridge circuit according to the first signal so as to adjust the amplitude of the alternating-current charging and discharging current.
8. The apparatus of claim 1, wherein the battery management system is specifically configured to:
when the temperature of the lithium battery is detected to be lower than a first temperature threshold value, generating a first signal for starting the self-heating power converter;
in the process of heating the lithium battery, when the temperature of the lithium battery is detected to be higher than a second temperature threshold value, generating a first signal for turning off the self-heating power converter; the first temperature threshold is less than the second temperature threshold.
9. The apparatus of claim 1, wherein the battery management system is further configured to:
detecting whether the lithium battery meets charge and discharge conditions; and if the charging and discharging conditions are met, generating a first signal according to the detected temperature.
10. The apparatus of any one of claims 1-9, further comprising:
a current sensor and/or a voltage sensor communicatively coupled to the battery management system;
the current sensor is used for measuring the current of the lithium battery and sending the current to the battery management system;
and the voltage sensor is used for measuring the voltage of the lithium battery and sending the voltage to the battery management system.
11. A method for heating a lithium battery, the method being applied to a self-heating power converter, the method comprising:
receiving a first signal sent by a battery management system, wherein the first signal is a signal generated according to the temperature of a lithium battery;
and according to the first signal, alternating current charging and discharging current is formed on the lithium battery so as to heat the lithium battery.
12. The method of claim 11, wherein said generating an alternating charging and discharging current on said lithium battery to heat said lithium battery based on said first signal comprises:
and according to the first signal, alternating current charging and discharging current is formed on the lithium battery, and the lithium battery is heated by a fixed frequency control strategy.
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