A circuit for heating a battery, a heating method, and an electronic device

Abstract

An embodiment of the present application provides a circuit for heating a battery, a heating method, and an electronic device. The circuit for heating the battery includes: a first terminal, a second terminal, a third terminal, a power battery, an inductor, a switching module, a motor, a first capacitor, and a second capacitor; the power battery is formed by connecting a plurality of batteries in series; the first terminal is connected to the first end of the power battery; the second terminal is connected to the second end of the power battery; the third terminal is connected to one end of one of the plurality of batteries; the first end of the first capacitor is connected to the first terminal; the first end of the second capacitor is connected to the second terminal; the second end of the first capacitor is connected to the second end of the second capacitor; the first end of the inductor is connected to the third terminal; the second end of the inductor is connected to the second end of the first capacitor and the second end of the second capacitor; the switching module is connected in parallel with the first capacitor and the second capacitor; the switching module is in a ZVS state. It can achieve rapid heating of the power battery.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a circuit, a heating method and an electronic device for heating a battery. Background Art

[0002] The low-temperature performance of power batteries for new energy vehicles is poor, so it is necessary to find ways to increase the battery temperature at low temperatures. The current technical solutions are: after heating the coolant through resistance heating, heat generation by the electric drive system, etc., the coolant heats the battery to achieve indirect heating; the motor winding is charged and discharged through the motor controller, thereby generating an AC current in the battery, and the battery is heated by the heat generated by the internal resistance of the battery, that is, direct heating of the internal resistance of the battery. The efficiency of the indirect heating method is very low, and a large amount of heat cannot be effectively transferred to the battery; the heat needs to be input into the battery through the coolant, the external structure of the battery, etc., the battery temperature rises very slowly, and there is a phenomenon of slow heat transfer; the temperature of the battery cell close to the coolant rises quickly, resulting in uneven battery heating. If the direct heating method is used, the heating current frequency is low, and the frequency of the AC current for direct heating is generally around 2kHz, which is very sensitive to the human ear, and the battery noise generated has a greater impact on the passengers; this method is not easy to use when the vehicle is in motion, and it is easy to cause torque jitter or affect the motor power output. Summary of the invention

[0003] In view of this, an object of the embodiments of the present application is to provide a circuit, a heating method and an electronic device for heating a battery, which can achieve efficient heating of the battery while reducing the current noise generated during the heating process.

[0004] In a first aspect, an embodiment of the present application provides a circuit for heating a battery, comprising:

[0005] A first terminal, a second terminal, a third terminal, a power battery, an inductor, a switch module, a motor, a first capacitor, and a second capacitor;

[0006] The power battery is composed of a plurality of batteries connected in series;

[0007] The first terminal is connected to the first end of the power battery;

[0008] The second terminal is connected to the second end of the power battery;

[0009] The third terminal is connected to a connection point between any two batteries among the plurality of batteries;

[0010] The first end of the first capacitor is connected to the first wiring terminal;

[0011] The first end of the second capacitor is connected to the second wiring terminal;

[0012] The second terminal of the first capacitor is connected to the second terminal of the second capacitor;

[0013] The first terminal of the inductor is connected to the third terminal;

[0014] The second terminal of the inductor is connected to the second terminal of the first capacitor and the second terminal of the second capacitor;

[0015] The switching module is connected in parallel with the first capacitor and / or the second capacitor;

[0016] The switching module is in the ZVS state.

[0017] In the above implementation process, since the switching module is in the ZVS state, a very high switching frequency can be adopted, such as above 20 kHz, so that high-frequency current beyond the audible range of the human ear is generated in the circuit, which can avoid the generation of noise in the circuit; and the effective value of this current is relatively high. In addition, the skin effect brought by the high-frequency current increases the internal resistance of the battery, and high-power rapid heating of the power battery can be achieved. In addition, the electromagnetic noise of the switching module is greatly reduced in the soft-switching state, and it has good electromagnetic compatibility.

[0018] Further, the third terminal is connected to the midpoint of the power battery.

[0019] In the above implementation process, the third terminal is connected to the midpoint of the power battery, and the number of batteries from the third terminal to the first terminal and the second terminal of the power battery is the same. Therefore, the entire circuit is more balanced. The battery half-bridge and the switching module form a complete full-bridge resonance, reducing the voltage stress on the power switch.

[0020] Further, the switching module includes: a first power switch; a second power switch;

[0021] The first power switch is connected in parallel with the first capacitor;

[0022] The second power switch is connected in parallel with the second capacitor.

[0023] In the above implementation process, the battery is divided into two series-connected parts to form a half-bridge, and the first power switch and the second power switch form another half-bridge. On this basis, the two half-bridges, together with the first capacitor, the second capacitor, and the inductor, form a full-bridge soft-switching resonant circuit.

[0024] Further, the circuit includes: a relay, and the relay is connected between the power battery and the electrical appliance of the vehicle.

[0025] In the above implementation process, the above circuit can effectively suppress the high-frequency heating current from flowing into the vehicle's bus, reduce the impact on the electrical appliances on the bus, and avoid affecting the normal operation of other electrical appliances. When the vehicle is in a driving state, the relay can remain closed without affecting the output torque of the vehicle's electric drive system.

[0026] Further, the switch module includes: a first diode and a second diode;

[0027] The first diode is connected in parallel with the first capacitor;

[0028] The second diode is connected in parallel with the second capacitor;

[0029] The first diode conducts unidirectionally from the third terminal to the first terminal;

[0030] The second diode conducts unidirectionally from the second terminal to the third terminal.

[0031] In the above implementation process, the first diode and the second diode conduct unidirectionally, providing a current direction freewheeling effect during the high-frequency current resonance process to achieve zero-voltage turn-on of the switch module.

[0032] Further, the first power switch and the second power switch are IGBTs or MOSFETs.

[0033] In a second aspect, an embodiment of the present application further provides a heating method, which is applied to the circuit for heating the battery according to any one of the first aspect. The method includes:

[0034] Driving the switch module of the circuit for heating the battery with a PWM wave;

[0035] The PWM wave makes the switch module in a ZVS state.

[0036] In the above implementation process, when the switch module is in the ZVS state, a relatively high switching frequency can be adopted, such as above 20 kHz. On the one hand, the high-frequency current can avoid the audible range of the human ear and eliminate noise. On the other hand, it can cause a significant skin effect to increase the internal resistance of the battery, thereby increasing the heating power. The soft-switching state also greatly reduces the switching electromagnetic noise of the switch module and significantly improves the electromagnetic compatibility.

[0037] In a third aspect, an embodiment of the present application provides a battery heating device, including:

[0038] A heating module for driving the switch module of the battery to be heated with a PWM wave; the PWM wave makes the switch module in a ZVS state.

[0039] Fourthly, an electronic device provided by an embodiment of the present application includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor implements the steps of the method according to any one of the first aspects when executing the computer program.

[0040] Other features and advantages disclosed in the present application will be described in the subsequent description, or some features and advantages can be inferred from the description or determined without doubt, or can be learned by implementing the above technologies disclosed in the present application.

[0041] To make the above objects, features, and advantages of the present application more obvious and understandable, the following specifically gives preferred embodiments and, in conjunction with the accompanying drawings, details are described as follows. Description of the Drawings

[0042] To more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0043] Figure 1 It is a schematic structural diagram of a circuit for heating a battery provided by an embodiment of the present application;

[0044] Figure 2 It is a schematic structural diagram of the connection between the circuit for heating a battery and an electrical appliance provided by an embodiment of the present application

[0045] Figure 3 It is a schematic structural diagram of an electronic device provided by an embodiment of the present application.

[0046] Markings: 1 - First connection terminal; 2 - Second connection terminal; 3 - Third connection terminal; 4 - Power battery; 5 - Inductor; 6 - Switch module; 61 - First power switch; 62 - Second power switch; 7 - Motor; 81 - First capacitor; 82 - Second capacitor; 91 - First diode; 92 - Second diode; A - Inverter; B - Relay. Detailed Embodiments

[0047] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0048] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, in the description of the present application, terms such as "first" and "second" are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0049] Example 1

[0050] Refer to Figure 1 , an embodiment of the present application provides a circuit for heating a battery, including:

[0051] A first terminal 1, a second terminal 2, a third terminal 3, a power battery 4, an inductor 5, a switch module 6, a motor 7, a first capacitor 81, and a second capacitor 82;

[0052] The first terminal 1 is connected to the first end of the power battery 4;

[0053] The second terminal 2 is connected to the second end of the power battery 4;

[0054] The third terminal 3 is connected to one end of one of the multiple batteries;

[0055] The first end of the first capacitor 81 is connected to the first terminal 1;

[0056] The first end of the second capacitor 82 is connected to the second terminal 2;

[0057] The second end of the first capacitor 81 is connected to the second end of the second capacitor 82;

[0058] The first end of the inductor 5 is connected to the third terminal 3;

[0059] The second end of the inductor 5 is connected to the second end of the first capacitor 81 and the second end of the second capacitor 82;

[0060] The switch module 6 is connected in parallel with the first capacitor 81 and the second capacitor 82;

[0061] The switch module is in the ZVS state.

[0062] In the above implementation process, since the switch module 6 is in the ZVS state, a very high switching frequency can be adopted, such as above 20 kHz, so that a high-frequency current beyond the audible range of the human ear can be generated in the circuit, which can avoid the generation of noise in the circuit; and the effective value of this current is relatively high. In addition, the skin effect brought by the high-frequency current increases the internal resistance of the battery, and high-power and rapid heating of the power battery can be achieved. In addition, the electromagnetic noise of the switch module is greatly reduced in the soft-switching state, and it has good electromagnetic compatibility.

[0063] Based on the above circuit, an embodiment of the present application provides a heating method, including:

[0064] Drive the switch module 6 for heating the battery with a PWM wave to make the first power switch 61 and the first power switch 61 in the zero-voltage soft-switching state.

[0065] In the above implementation process, the first power switch 61 and the first power switch 61 conduct complementarily with a certain dead time, and the switching frequency is lower than the resonance frequency of the resonance circuit composed of the resonance inductor 5, the first capacitor 81, and the second capacitor 82, so that the first power switch 61 and the first power switch 61 are in the zero-voltage switching state (ZVS state).

[0066] It can be understood that the dead time is related to the battery voltage and can be dynamically adjusted in real time according to the battery voltage.

[0067] The switching module 6 is in the zero-voltage state. At this time, a high-frequency current will flow through the power battery 4, thereby realizing rapid heating of the power battery 4. Since the switching module 6 is in the ZVS state, the switching frequency can be increased to more than 20 kHz, avoiding the generation of noise that can be heard by the human ear. Moreover, the skin effect of the high-frequency current can be utilized to increase the ohmic internal resistance of the battery and improve the heating power. The switching electromagnetic noise of the switching module in the soft-switching state is greatly reduced, ensuring good battery compatibility.

[0068] In a possible implementation manner, the third terminal 3 is connected to the midpoint of the power battery 4.

[0069] In the above implementation process, the third terminal 3 is connected to the midpoint of the power battery 4, and the third terminal 3 has the same number of batteries to the first end and the second end of the power battery 4. Therefore, the entire circuit is more balanced and can uniformly heat the power battery 4. The battery half-bridge and the switching half-bridge form a complete full-bridge resonance, reducing the voltage stress of the power switch. If it is unbalanced, as the degree of imbalance increases, more and more high-frequency current will flow into the bus.

[0070] Further, the switching module includes: a first power switch 61; a second power switch 62;

[0071] The first power switch 61 is connected in parallel with the first capacitor 81;

[0072] The second power switch 62 is connected in parallel with the second capacitor 82.

[0073] In the above implementation process, the battery is divided into two series-connected parts to form a half-bridge, and the first power switch 61 and the second power switch 62 form another half-bridge. On this basis, the two half-bridges, the first capacitor 81, the second capacitor 82, and the inductor 5 form a full-bridge soft-switching resonance circuit.

[0074] In a possible implementation manner, the switching module 6 includes: a first diode 91, a second diode 92;

[0075] The first diode 91 is connected in parallel with the first capacitor 81;

[0076] The second diode 92 is connected in parallel with the second capacitor 82;

[0077] The first diode 91 conducts unidirectionally from the third terminal 3 to the first terminal 1;

[0078] The second diode 92 conducts unidirectionally from the second terminal 2 to the third terminal 3.

[0079] In the above implementation process, the first diode 91 and the second diode 92 conduct unidirectionally. They provide a current direction freewheeling effect during the high-frequency current resonance process, realizing the zero-voltage turn-on of the switching module 6.

[0080] See Figure 2 , further, the circuit includes: a relay B, and the relay B is connected between the power battery and the electrical appliances of the vehicle. Exemplarily, the electrical appliance can be a motor 7, etc., and the motor is also connected to an inverter A.

[0081] The above circuit can effectively suppress the high-frequency heating current from flowing to the vehicle bus, reduce the impact on the electrical appliances on the vehicle bus, and avoid affecting the normal operation of other electrical appliances. When the vehicle is in a driving state, the relay B can remain closed without affecting the output torque of the vehicle's electric drive system.

[0082] Exemplarily, the capacitance value C1 of the first capacitor 81 = the capacitance value C2 of the second capacitor = 4 uF, L = 4 uF, the switching frequencies of the first power switch 61 and the second power switch 62 are 20 kHz, the conduction duty ratio is 30%, the voltages of the two series-connected batteries are both 200 V, and the internal resistances of the series-connected batteries are both 100 mΩ. At this time, both the first power switch 61 and the second power switch 62 are in the ZVS state, and a high-frequency current of 20 kHz flows through the battery, with an effective value reaching 200 A, and a power of 200 A * 200 A * 0.1 Ω * 2 = 8 kW can be generated, which is sufficient to quickly heat the battery.

[0083] Embodiment 2

[0084] The embodiment of the present application provides a heating method, including:

[0085] Driving the switching module of the circuit for heating the battery with a PWM wave;

[0086] The PWM wave makes the switching module in the ZVS state.

[0087] In the above implementation process, the switching module is in the ZVS state, so a very high switching frequency can be adopted, such as above 20 kHz, so that high-frequency current beyond the audible range of the human ear can be generated in the circuit, which can avoid the generation of noise in the circuit; and the effective value of this current is relatively high. In addition, the skin effect brought by the high-frequency current increases the internal resistance of the battery, and high-power and rapid heating of the power battery can be achieved. In addition, in the soft-switching state, the electromagnetic noise of the switching module is greatly reduced, and it has good electromagnetic compatibility.

[0088] Embodiment 3

[0089] An embodiment of the present application provides a heating device, which is applied to the circuit for heating the battery in Embodiment 1. The device includes:

[0090] A heating module, configured to drive the switching module 6 of the circuit for heating the battery with a PWM wave; the PWM wave makes the switching module in the ZVS state.

[0091] The present application also provides an electronic device. Please refer to Figure 3 , Figure 3 which is a structural block diagram of an electronic device provided by an embodiment of the present application. The electronic device may include a processor 31, a communication interface 32, a memory 23, and at least one communication bus 34. Among them, the communication bus 34 is used to realize the direct connection and communication of these components. Among them, the communication interface 32 of the electronic device in the embodiment of the present application is used to communicate signaling or data with other node devices. The processor 31 may be an integrated circuit chip with signal processing capabilities.

[0092] The above-mentioned processor 31 may be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it may also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components. It can implement or execute the various methods, steps, and logic block diagrams disclosed in the embodiments of the present application. The general-purpose processor may be a microprocessor or the processor 31 may also be any conventional processor, etc.

[0093] The memory 33 may be, but is not limited to, a Random Access Memory (RAM), a Read Only Memory (ROM), a Programmable Read-Only Memory (PROM), an Erasable Programmable Read-Only Memory (EPROM), an Electric Erasable Programmable Read-Only Memory (EEPROM), etc. Computer-readable instructions are stored in the memory 33. When the computer-readable instructions are executed by the processor 31, the electronic device can execute each step involved in the above method embodiments.

[0094] Optionally, the electronic device may further include a storage controller and an input / output unit.

[0095] The memory 33, the storage controller, the processor 31, the peripheral interface, and the input / output unit are electrically connected to each other directly or indirectly to achieve data transmission or interaction. For example, these components can be electrically connected to each other through one or more communication buses 34. The processor 31 is configured to execute the executable modules stored in the memory 33, such as software function modules or computer programs included in the electronic device.

[0096] The input / output unit is used to provide the user with the ability to create a task and create a start option period or a preset execution time for the task to realize the interaction between the user and the server. The input / output unit may be, but is not limited to, a mouse, a keyboard, etc.

[0097] It can be understood that Figure 3 The structure shown is only schematic, and the electronic device may further include more or fewer components than those shown Figure 3 herein, or have a different configuration from that shown Figure 3 herein. Figure 3 Each component shown herein may be implemented by hardware, software, or a combination thereof.

[0098] The embodiment of the present application also provides a computer-readable storage medium. Instructions are stored on the computer-readable storage medium. When the instructions are run on a computer, the computer program, when executed by a processor, implements the method described in the method embodiment. To avoid repetition, it will not be elaborated herein.

[0099] In several embodiments provided by this application, it should be understood that the disclosed devices and methods can also be implemented in other ways. The device embodiments described above are merely illustrative. For example, the flowcharts and block diagrams in the drawings show the possible architectures, functions, and operations of devices, methods, and computer program products according to multiple embodiments of this application. In this regard, each block in the flowchart or block diagram can represent a module, a program segment, or a part of code, and the module, program segment, or part of code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order from that marked in the drawings. For example, two consecutive blocks can actually be executed substantially in parallel, and they can sometimes be executed in the reverse order, depending on the functions involved. It should also be noted that each block in the block diagram and / or flowchart, as well as the combination of blocks in the block diagram and / or flowchart, can be implemented by a dedicated hardware-based system for performing the specified functions or actions, or can be implemented by a combination of dedicated hardware and computer instructions.

[0100] In addition, each functional module in various embodiments of this application can be integrated together to form an independent part, or each module can exist alone, or two or more modules can be integrated to form an independent part.

[0101] If the described function is implemented in the form of a software functional module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of this application. The aforementioned storage medium includes: USB flash drives, mobile hard disks, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical discs, etc., which can store program codes.

[0102] The above are only examples of the present application and are not intended to limit the protection scope of the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application. It should be noted that similar reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0103] As described above, the above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, and all should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

[0104] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

Claims

1. A circuit for heating a battery, characterized in that, Comprising: A first terminal, a second terminal, a third terminal, a power battery, an inductor, a switching module, a motor, a first capacitor, and a second capacitor; The power battery is formed by connecting a plurality of batteries in series; The first terminal is connected to the first end of the power battery; The second terminal is connected to the second end of the power battery; The third terminal is connected to a connection point between any two of the plurality of batteries; The first end of the first capacitor is connected to the first terminal; The first end of the second capacitor is connected to the second terminal; The second end of the first capacitor is connected to the second end of the second capacitor; The first end of the inductor is connected to the third terminal; The second end of the inductor is connected to the second end of the first capacitor and the second end of the second capacitor; The switching module is connected in parallel with the first capacitor and the second capacitor; The switching module is in a ZVS state.

2. The circuit for heating a battery according to claim 1, wherein, The third terminal is connected to the midpoint of the power battery.

3. The circuit for heating a battery according to claim 2, wherein The switching module includes: a first power switch; a second power switch; The first power switch is connected in parallel with the first capacitor; The second power switch is connected in parallel with the second capacitor.

4. The circuit for heating a battery according to claim 3, wherein The switching module includes: a first diode, a second diode; The first diode is connected in parallel with the first capacitor; The second diode is connected in parallel with the second capacitor; The first diode conducts unidirectionally from the third terminal to the first terminal; The second diode conducts unidirectionally from the second terminal to the third terminal.

5. The circuit for heating a battery according to claim 1, wherein The circuit includes: a relay, and the relay is connected between the power battery and an electrical appliance of the vehicle.

6. The circuit for heating a battery according to claim 3, characterized in that, The first power switch is an IGBT or a MOSFET, and the second power switch is an IGBT or a MOSFET.

7. A heating method, characterized in that, Applied to the circuit for heating a battery according to any one of claims 1-6, the method includes: Driving the switching module of the circuit for heating the battery with a PWM wave; The PWM wave makes the switching module in a ZVS state.

8. A heating device, characterized in that, Applied to the circuit for heating a battery according to any one of claims 1-6, the device includes: A heating module for driving the switching module of the circuit for heating the battery with a PWM wave; the PWM wave makes the switching module in a ZVS state.

9. An electronic device, characterized in that, Comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, and when the processor executes the computer program, the steps of the method according to claim 7 are implemented.

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