A pulse heating system and a heating control method, device and storage medium thereof

Abstract

This application discloses a pulse heating system and its heating control method, device, electronic device, and storage medium. The system is used to internally heat a lithium-ion power battery and specifically includes a capacitor, an inductor, a first switching element, and a second switching element. The lithium-ion power battery includes a first battery pack and a second battery pack with the same capacity connected in series. One end of the capacitor is connected to the positive output terminal of the first battery pack, and the other end is connected to the negative output terminal of the second power battery pack. One end of the inductor is connected to the negative output terminal of the first battery pack and the positive output terminal of the second battery pack, respectively. The other end of the inductor is connected to one end of the first switching element and one end of the second switching element, respectively. The other end of the first switching element is connected to the positive output terminal of the first battery pack, and the other end of the second switching element is connected to the negative output terminal of the second battery pack. The first and second switching elements perform on / off operations based on input first and second control signals. When the first switching element is turned off, the second switching element is turned on; when the first switching element is turned on, the second switching element is turned off, so that the operating current of the inductor intermittently charges and discharges the first and second battery packs. This solution allows the cells inside the power battery pack to generate heat through self-discharge, rather than through external heating, thereby improving heating efficiency.

Description

Technical Field

[0001] This application relates to the field of lithium-ion battery technology, and more specifically, to a pulse heating system and its heating control method, apparatus, electronic device and storage medium. Background Technology

[0002] Lithium-ion batteries, with their outstanding advantages such as high energy density, long cycle life, and environmental friendliness, have been widely used in new energy vehicles, energy storage systems, and other fields, becoming a core component driving energy transformation and transportation electrification. However, low-temperature environments (typically referring to the range of -20℃ to 0℃) significantly deteriorate the electrochemical performance of lithium-ion batteries. Specifically, this manifests as a decrease in electrolyte ionic conductivity, a reduction in the diffusion rate of lithium ions in electrode materials, and an increase in SEI film impedance. Consequently, this leads to problems such as battery charge / discharge capacity decay, limited charge / discharge rate, and poor cycle stability. In severe cases, it can even cause safety hazards such as lithium deposition, greatly restricting the reliable application of new energy products in cold regions.

[0003] To alleviate the aforementioned low-temperature issues and ensure the performance and safety of batteries in low-temperature environments, power battery heating technology has emerged. Currently, the mainstream solution in the industry is external heating, which involves placing heating elements outside the battery, such as PTC heaters, heating films, or heating jackets, to transfer heat to individual battery cells or modules through heat conduction and radiation, thereby raising the battery temperature. External heating solutions are characterized by relatively simple structure, controllable cost, and high technological maturity, and have already been practically applied in some new energy vehicles and energy storage devices.

[0004] However, existing external heating solutions require heat to be transferred to the battery through multiple layers such as external heating elements and battery casing, resulting in a large amount of heat loss during the process and low heating efficiency. Summary of the Invention

[0005] In view of this, this application provides a pulse heating system and its heating control method, apparatus, electronic device and storage medium for internal heating of lithium-ion power batteries to improve heating efficiency.

[0006] To achieve the above objectives, the following solution is proposed:

[0007] A pulse heating system is provided for internal heating of a lithium-ion power battery, the lithium-ion power battery comprising a first battery pack and a second battery pack of the same capacity connected in series, the pulse heating system comprising a capacitor, an inductor, a first switching element, and a second switching element, wherein:

[0008] One end of the capacitor is connected to the positive terminal of the first battery pack and the other end is connected to the negative terminal of the second power battery pack. One end of the inductor is connected to the negative terminal of the first battery pack and the positive terminal of the second battery pack. The other end of the inductor is connected to one end of the first switching element and one end of the second switching element. The other end of the first switching element is connected to the positive terminal of the first battery pack and the other end of the second switching element is connected to the negative terminal of the second battery pack.

[0009] The first switching element and the second switching element perform on / off operations based on the input first control signal and the second control signal. When the first switching element is turned off, the second switching element is turned on, and when the first switching element is turned on, the second switching element is turned off, so that the operating current of the inductor intermittently charges and discharges the first battery pack and the second battery pack.

[0010] Optionally, the first switch control signal and the second control signal have the same amplitude and frequency, but their phases are completely opposite.

[0011] A heating control method, applied to the pulse heating control system described above, the heating control method comprising the steps of:

[0012] Heating control parameters are determined based on peak current control method;

[0013] Based on the heating control parameters, the first control signal is output to the first switching element, and the second control signal is output to the second switching element.

[0014] The selected method for determining control parameters based on peak current control includes the following steps:

[0015] Obtain the maximum charge and discharge amplitude that the cell of the lithium-ion power battery can withstand;

[0016] The heating control parameters are determined based on the maximum charge / discharge amplitude and the cell temperature rise map.

[0017] Optionally, the heating control parameters include frequency and duty cycle.

[0018] A heating control device is applied to the pulse heating control system described above. Optionally, the heating control device includes:

[0019] The parameter determination module is configured to determine heating control parameters based on the peak current control method.

[0020] The control execution module is configured to output the first control signal to the first switching element and the second control signal to the second switching element based on the heating control parameters.

[0021] Optionally, the parameter determination module includes:

[0022] The first calculation unit is configured to obtain the maximum charge and discharge amplitude that the cell of the lithium-ion power battery can withstand;

[0023] The second calculation unit is configured to determine the heating control parameters based on the maximum charge / discharge amplitude and the cell temperature rise map.

[0024] Optionally, the heating control parameters include frequency and duty cycle.

[0025] An electronic device for use in lithium-ion power batteries, the electronic device comprising at least one processor and a memory connected to the processor, wherein:

[0026] The memory is used to store computer programs or instructions;

[0027] The processor is used to execute the computer program or instructions to enable the electronic device to implement the heating control method as described above.

[0028] A computer-readable storage medium is applied to an electronic device, the storage medium carrying one or more computer programs that can be executed by the electronic device to enable the electronic device to implement the heating control method described above.

[0029] As can be seen from the above technical solution, this application discloses a pulse heating system and its heating control method, device, electronic device, and storage medium. This system is used to internally heat a lithium-ion power battery, specifically including a capacitor, an inductor, a first switching element, and a second switching element. The lithium-ion power battery includes a first battery pack and a second battery pack with the same capacity connected in series. One end of the capacitor is connected to the positive output terminal of the first battery pack, and the other end is connected to the negative output terminal of the second power battery pack. One end of the inductor is connected to the negative output terminal of the first battery pack and the positive output terminal of the second battery pack, respectively. The other end of the inductor is connected to one end of the first switching element and one end of the second switching element, respectively. The other end of the first switching element is connected to the positive output terminal of the first battery pack, and the other end of the second switching element is connected to the negative output terminal of the second battery pack. The first and second switching elements perform on / off operations based on the input first and second control signals. When the first switching element is turned off, the second switching element is turned on; when the first switching element is turned on, the second switching element is turned off, so that the operating current of the inductor intermittently charges and discharges the first and second battery packs. This solution allows the cells inside the power battery pack to generate heat through self-discharge, rather than through external heating, thereby improving heating efficiency. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a circuit diagram of a pulse heating system according to an embodiment of this application;

[0032] Figure 2a This is a schematic diagram of the current in mode 1 of the pulse heating system according to an embodiment of this application;

[0033] Figure 2b This is a schematic diagram of the current in mode 2 of the pulse heating system according to an embodiment of this application;

[0034] Figure 2c This is a schematic diagram of the current in mode 3 of the pulse heating system according to an embodiment of this application;

[0035] Figure 2d This is a schematic diagram of the current in mode 4 of the pulse heating system according to an embodiment of this application;

[0036] Figure 3 This is a flowchart of a heating control method according to an embodiment of this application;

[0037] Figure 4 This is a MAP diagram of the cell temperature rise according to an embodiment of this application;

[0038] Figure 5 This is a schematic diagram of control signals according to an embodiment of this application;

[0039] Figure 6 This is a block diagram of a heating control device according to an embodiment of this application;

[0040] Figure 7 This is a block diagram of another heating control device according to an embodiment of this application;

[0041] Figure 8 This is a block diagram of an electronic device according to an embodiment of this application. Detailed Implementation

[0042] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0043] In view of the existing technical problems, a pulse heating system is proposed for use in lithium-ion power batteries. The lithium-ion power battery is divided into a first battery pack 100 and a second battery pack 200 connected in series, as follows: Figure 1 As shown, it is not actually divided in its structure, but only in terms of circuitry. The positive output terminal of the first battery pack serves as the positive output terminal of the primary battery pack, and the negative output terminal of the second battery pack serves as the negative output terminal of the primary battery pack. The negative output terminal of the first battery pack and the positive output terminal of the second battery pack are electrically connected, thus completing the series connection between the two.

[0044] The pulse heating system of this application includes a capacitor C, an inductor L, a first switching element Q1 and a second switching element Q2. The switching elements can be implemented using a CMOS transistor, a triode, or other components with switching functions. This application uses a CMOS transistor to implement the switching element.

[0045] One end of the capacitor is connected to the positive terminal of the first battery pack output, and the other end is connected to the negative terminal of the second power battery pack output; one end of the inductor is connected to the negative terminal of the first battery pack output, and the other end is connected to one end of the first switching element and one end of the second switching element output; the other end of the first switching element is connected to the positive terminal of the first battery pack output, and the other end of the second switching element is connected to the negative terminal of the second battery pack output.

[0046] During the heating operation of the lithium-ion power battery, the first and second switching elements perform on / off operations based on the input first and second control signals. When the first switching element is turned off, the second switching element is turned on, and when the first switching element is turned on, the second switching element is turned off, so that the inductor's operating current intermittently charges and discharges the first and second battery packs. The first control signal output to the first switching element and the second control signal output to the second switching element have the same amplitude and frequency, but their phases are opposite; that is, when the first switching element is controlled to turn on, the second switching element is controlled to turn off, and when the first switching element is controlled to turn off, the second switching element is controlled to turn on. Under these conditions, the pulse heating system operates in the following four modes.

[0047] Mode 1: The first switching element Q1 is turned on, the second switching element Q2 is turned off, and the inductor current discharges through the first battery pack, such as... Figure 2a As shown;

[0048] Mode 2: The first switching element Q1 is turned off, the second switching element Q2 is turned on, and the inductor current charges the second battery pack, such as... Figure 2b As shown;

[0049] Mode 3: The first switching element Q1 is turned off, the second switching element Q2 is turned on, and the inductor current discharges through the second battery pack, such as... Figure 2c As shown;

[0050] Mode 4: The first switching element Q1 is turned on, the second switching element Q2 is turned off, and the inductor current charges battery pack 1, such as... Figure 2d As shown.

[0051] As can be seen from the above technical solution, this embodiment provides a pulse heating system for internal heating of a lithium-ion power battery, specifically including a capacitor, an inductor, a first switching element, and a second switching element. The lithium-ion power battery includes a first battery pack and a second battery pack with the same capacity connected in series. One end of the capacitor is connected to the positive output terminal of the first battery pack, and the other end is connected to the negative output terminal of the second power battery pack. One end of the inductor is connected to the negative output terminal of the first battery pack and the positive output terminal of the second battery pack, respectively. The other end of the inductor is connected to one end of the first switching element and one end of the second switching element, respectively. The other end of the first switching element is connected to the positive output terminal of the first battery pack, and the other end of the second switching element is connected to the negative output terminal of the second battery pack. The first and second switching elements perform on / off operations based on the input first and second control signals. When the first switching element is turned off, the second switching element is turned on; when the first switching element is turned on, the second switching element is turned off, so that the operating current of the inductor intermittently charges and discharges the first and second battery packs. This solution allows the cells inside the power battery pack to generate heat through self-discharge, rather than external heating, thereby improving heating efficiency.

[0052] Furthermore, this pulse system ensures that the energy lost by the two power battery packs is proportional to the total capacity of their respective power batteries, thereby ensuring that the voltage of each cell in the two power batteries remains consistent.

[0053] Figure 3 This is a flowchart of a heating control method according to an embodiment of this application.

[0054] like Figure 3 As shown, the heating control method provided in this embodiment is applied to an electronic device for heating control of the pulse heating system of the aforementioned lithium-ion power battery. Specifically, it heats the lithium-ion power battery by outputting a control signal to the pulse heating system. This electronic device can be understood as a computer or embedded device with data computing and information processing capabilities. The heating control method specifically includes the following steps:

[0055] S1. Determine heating control parameters based on peak current control method.

[0056] The heating control parameters here include the frequency and duty cycle of two control signals. The heating control parameters are determined through the following steps.

[0057] First, calculate the maximum charge and discharge amplitude that a lithium-ion power battery cell can withstand.

[0058] The specific calculation process is as follows. Taking the charging and discharging process of the first battery pack in modes 1 and 4 as an example, the following definitions are made:

[0059] Voltage of the first battery pack: The total internal resistance of the first battery pack is: ;

[0060] Voltage of the second battery pack: The total internal resistance of the second battery pack: ;

[0061] Peak current limiting for the first battery pack: Peak current limiting for the second battery pack: ;

[0062] Internal resistance of a single cell: .

[0063] The voltage formula for its first battery pack is:

[0064]

[0065] The energy loss of a single cell in the first battery pack is:

[0066]

[0067]

[0068] We can obtain:

[0069]

[0070] Similarly, the energy loss of a single cell in the second battery pack can be obtained as follows:

[0071]

[0072] because Therefore, we can conclude that: if but Heng was established, among which The maximum value is the maximum charge and discharge amplitude that the battery cell can withstand.

[0073] Then, heating control parameters are determined from the cell temperature rise MAP based on the maximum charge / discharge amplitude.

[0074] The hardware topology of this pulse heating system dictates that the amplitude of the operating current and the charging / discharging frequency are fixed; that is, once the operating current value is determined, the corresponding operating frequency is also determined. However, the cell temperature rise map imposes limitations on both amplitude and frequency. The fixed frequency corresponding to the heater's amplitude may not meet the requirements. Therefore, a discontinuous control mode is needed to achieve frequency conversion while maintaining a constant amplitude, ensuring that both amplitude and frequency remain within a certain range to avoid lithium plating and overvoltage risks in the cell.

[0075] Intermittent control can prevent the heater from operating at full capacity. Before selecting the operating amplitude and frequency, the effective duty cycle needs to be converted and the optimal temperature rise strategy needs to be found on a map. This map is shown below. Figure 4 As shown in the MAP graph, the orange line represents the frequency curve corresponding to the amplitude, and the area above the orange line represents the selectable power range. The first operating point has an amplitude of 313A, requiring downclocking to 246Hz, resulting in an effective duty cycle of 246 / 350 and a final temperature rise coefficient of 2.28 * 246 / 350 = 1.60. The second operating point has an amplitude of 280A and can operate at full load at 400Hz, with a temperature rise rate of 1.75. Therefore, the second operating point should be selected based on a comprehensive consideration.

[0076] S2. Based on the heating control parameters, output the corresponding control signal to the switching element.

[0077] After determining the aforementioned heating control parameters, a first control signal and a second control signal are output to the first and second switching elements based on these parameters. This enables them to heat the lithium-ion power battery, specifically as follows: Figure 5 As shown, the top square wave is a schematic diagram of the first control signal, the middle square wave is a schematic diagram of the second control signal, and the bottom square wave is the current of the inductor.

[0078] As can be seen from the above technical solution, this embodiment provides a heating control method. This method is applied to the pulse heating control system described above, specifically by determining heating control parameters based on a peak current control method; outputting a first control signal to a first switching element and a second control signal to a second switching element based on the heating control parameters. Through the above control, the lithium-ion power battery can self-heat, thereby improving heating efficiency.

[0079] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this disclosure. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0080] Although the operations are described in a specific order, this should not be construed as requiring these operations to be performed in the specific order shown or in a sequential order. In certain environments, multitasking and parallel processing may be advantageous.

[0081] It should be understood that the steps described in the method embodiments of this disclosure may be performed in different orders and / or in parallel. Furthermore, the method embodiments may include additional steps and / or omit the steps shown. The scope of this disclosure is not limited in this respect.

[0082] Computer program code for performing the operations of this disclosure can be written in one or more programming languages ​​or a combination thereof, including but not limited to object-oriented programming languages ​​such as Java, Smalltalk, and C++, as well as conventional procedural programming languages ​​such as C or similar languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or can be connected to an external computer.

[0083] Figure 6 This is a block diagram of a heating control device according to an embodiment of this application.

[0084] like Figure 6 As shown, the heating control device provided in this embodiment is applied to an electronic device for heating control of the pulse heating system of the aforementioned lithium-ion power battery, that is, to achieve heating of the lithium-ion power battery by outputting a control signal to the pulse heating system. This electronic device can be understood as a computer or embedded device with data computing and information processing capabilities. Specifically, the heating control device includes a parameter determination module 10 and a control execution module 20.

[0085] The parameter determination module is used to determine heating control parameters based on the peak current control method.

[0086] The heating control parameters here include the frequency and duty cycle of two control signals. Specifically, this module includes a first calculation unit 11 and a second calculation unit 12, such as... Figure 7 As shown.

[0087] The first calculation unit is used to calculate the maximum charge and discharge amplitude that a lithium-ion power battery cell can withstand.

[0088] The specific calculation process is as follows. Taking the charging and discharging process of the first battery pack in modes 1 and 4 as an example, the following definitions are made:

[0089] Voltage of the first battery pack: The total internal resistance of the first battery pack is: ;

[0090] Voltage of the second battery pack: The total internal resistance of the second battery pack: ;

[0091] Peak current limiting for the first battery pack: Peak current limiting for the second battery pack: ;

[0092] Internal resistance of a single cell: .

[0093] The voltage formula for its first battery pack is:

[0094]

[0095] The energy loss of a single cell in the first battery pack is:

[0096]

[0097]

[0098] We can obtain:

[0099]

[0100] Similarly, the energy loss of a single cell in the second battery pack can be obtained as follows:

[0101]

[0102] because Therefore, we can conclude that: if but Heng was established, among which The maximum value is the maximum charge and discharge amplitude that the battery cell can withstand.

[0103] The second calculation unit is used to determine the heating control parameters from the cell temperature rise MAP based on the maximum charge / discharge amplitude.

[0104] The hardware topology of this pulse heating system dictates that the amplitude of the operating current and the charging / discharging frequency are fixed; that is, once the operating current value is determined, the corresponding operating frequency is also determined. However, the cell temperature rise map imposes limitations on both amplitude and frequency. The fixed frequency corresponding to the heater's amplitude may not meet the requirements. Therefore, a discontinuous control mode is needed to achieve frequency conversion while maintaining a constant amplitude, ensuring that both amplitude and frequency remain within a certain range to avoid lithium plating and overvoltage risks in the cell.

[0105] Intermittent control can prevent the heater from operating at full capacity. Before selecting the operating amplitude and frequency, the effective duty cycle needs to be converted and the optimal temperature rise strategy needs to be found on a map. This map is shown below. Figure 4 As shown in the MAP graph, the orange line represents the frequency curve corresponding to the amplitude, and the area above the orange line represents the selectable power range. The first operating point has an amplitude of 313A, requiring downclocking to 246Hz, resulting in an effective duty cycle of 246 / 350 and a final temperature rise coefficient of 2.28 * 246 / 350 = 1.60. The second operating point has an amplitude of 280A and can operate at full load at 400Hz, with a temperature rise rate of 1.75. Therefore, the second operating point should be selected based on a comprehensive consideration.

[0106] The control execution module is used to output corresponding control signals to the switching element based on the heating control parameters.

[0107] After determining the aforementioned heating control parameters, a first control signal and a second control signal are output to the first and second switching elements based on these parameters. This enables them to heat the lithium-ion power battery, specifically as follows: Figure 5 As shown, the top square wave is a schematic diagram of the first control signal, the middle square wave is a schematic diagram of the second control signal, and the bottom square wave is the current of the inductor.

[0108] As can be seen from the above technical solution, this embodiment provides a heating control device. This device is applied to the pulse heating control system described above, specifically by determining heating control parameters based on a peak current control method; outputting a first control signal to a first switching element and a second control signal to a second switching element based on the heating control parameters. Through the above control, the lithium-ion power battery can self-heat, thereby improving heating efficiency.

[0109] The units described in the embodiments of this disclosure can be implemented in software or in hardware. The name of a unit does not necessarily limit the unit itself; for example, the first acquisition unit can also be described as "a unit that acquires at least two Internet Protocol addresses".

[0110] The functions described above in this document can be performed at least in part by one or more hardware logic components. For example, exemplary types of hardware logic components that can be used, without limitation, include: field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), application-specific standard products (ASSPs), system-on-a-chip (SoCs), complex programmable logic devices (CPLDs), and so on.

[0111] Figure 8 This is a block diagram of an electronic device according to an embodiment of this application.

[0112] The following is for reference. Figure 8 This document illustrates a structural diagram suitable for implementing the electronic device in the embodiments of this disclosure. The terminal device in the embodiments of this disclosure may include, but is not limited to, mobile terminals such as mobile phones, laptops, digital broadcast receivers, PDAs (personal digital assistants), PADs (tablet computers), PMPs (portable multimedia players), in-vehicle terminals (e.g., in-vehicle navigation terminals), and fixed terminals such as digital TVs and desktop computers. This electronic device is merely an example and should not impose any limitations on the functionality and scope of use of the embodiments of this disclosure.

[0113] The electronic device may include a processing unit (e.g., a central processing unit, a graphics processing unit, etc.) 801, which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 802 or a program loaded from an input device 806 into a random access memory (RAM) 803. The RAM also stores various programs and data required for the operation of the electronic device. The processing unit, ROM, and RAM are interconnected via a bus 804. An input / output (I / O) interface 805 is also connected to the bus 804.

[0114] Typically, the following devices can be connected to the I / O interface: input devices including, for example, touchscreens, touchpads, keyboards, mice, cameras, microphones, accelerometers, gyroscopes, etc.; output devices 807 including, for example, liquid crystal displays (LCDs), speakers, vibrators, etc.; storage devices 808 including, for example, magnetic tapes, hard disks, etc.; and communication devices 809. Communication device 809 allows the electronic device to communicate wirelessly or wiredly with other devices to exchange data. Although electronic devices with various devices are shown in the figures, it should be understood that it is not required to implement or possess all of the devices shown. More or fewer devices may be implemented or possessed alternatively.

[0115] This application also provides an embodiment of a computer-readable storage medium.

[0116] The aforementioned computer-readable storage medium is used in an electronic device and carries one or more computer programs. When these programs are executed by the electronic device, the device determines heating control parameters based on a peak current control method; outputs a first control signal to a first switching element and a second control signal to a second switching element based on the heating control parameters. This control enables the lithium-ion battery to heat itself, thereby improving heating efficiency.

[0117] It should be noted that the computer-readable medium described above in this disclosure can be a computer-readable signal medium or a computer-readable storage medium, or any combination of the two. A computer-readable storage medium can be, for example,—but not limited to—an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of a computer-readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof.

[0118] In this disclosure, a computer-readable storage medium can be any tangible medium that contains or stores a program that can be used by or in connection with an instruction execution system, apparatus, or device. In this disclosure, a computer-readable signal medium can include a data signal propagated in baseband or as part of a carrier wave, carrying computer-readable program code. Such propagated data signals can take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. A computer-readable signal medium can also be any computer-readable medium other than a computer-readable storage medium, which can send, propagate, or transmit a program for use by or in connection with an instruction execution system, apparatus, or device. The program code contained on the computer-readable medium can be transmitted using any suitable medium, including but not limited to: wires, optical fibers, RF (radio frequency), etc., or any suitable combination thereof.

[0119] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0120] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the embodiments of the present invention.

[0121] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes said element.

[0122] The technical solution provided by the present invention has been described in detail above. Specific examples have been used to illustrate the principle and implementation of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A pulse heating system for internal heating of a lithium-ion power battery, the lithium-ion power battery comprising a first battery pack and a second battery pack of the same capacity connected in series, characterized in that, The pulse heating system includes a capacitor, an inductor, a first switching element, and a second switching element, wherein: One end of the capacitor is connected to the positive terminal of the first battery pack and the other end is connected to the negative terminal of the second power battery pack. One end of the inductor is connected to the negative terminal of the first battery pack and the positive terminal of the second battery pack. The other end of the inductor is connected to one end of the first switching element and one end of the second switching element. The other end of the first switching element is connected to the positive terminal of the first battery pack and the other end of the second switching element is connected to the negative terminal of the second battery pack. The first switching element and the second switching element perform on / off operations based on the input first control signal and the second control signal. When the first switching element is turned off, the second switching element is turned on, and when the first switching element is turned on, the second switching element is turned off, so that the operating current of the inductor intermittently charges and discharges the first battery pack and the second battery pack.

2. The pulse heating system as described in claim 1, characterized in that, The first switch control signal and the second control signal have the same amplitude and frequency, but their phases are completely opposite.

3. A heating control method, applied to the pulse heating control system as described in claim 1 or 2, characterized in that, The heating control method includes the following steps: Heating control parameters are determined based on peak current control method; Based on the heating control parameters, the first control signal is output to the first switching element, and the second control signal is output to the second switching element.

4. The heating control method as described in claim 3, characterized in that, The method for determining control parameters based on peak current control includes the following steps: Obtain the maximum charge and discharge amplitude that the cell of the lithium-ion power battery can withstand; The heating control parameters are determined based on the maximum charge / discharge amplitude and the cell temperature rise map.

5. The heating control method as described in claim 4, characterized in that, The heating control parameters include frequency and duty cycle.

6. A heating control device, applied to the pulse heating control system as described in claim 1 or 2, characterized in that, The heating control device includes: The parameter determination module is configured to determine heating control parameters based on the peak current control method. The control execution module is configured to output the first control signal to the first switching element and the second control signal to the second switching element based on the heating control parameters.

7. The heating control device as described in claim 6, characterized in that, The parameter determination module includes: The first calculation unit is configured to obtain the maximum charge and discharge amplitude that the cell of the lithium-ion power battery can withstand; The second calculation unit is configured to determine the heating control parameters based on the maximum charge / discharge amplitude and the cell temperature rise map.

8. The heating control device as described in claim 7, characterized in that, The heating control parameters include frequency and duty cycle.

9. An electronic device applied to a lithium-ion power battery, characterized in that, The electronic device includes at least one processor and a memory connected to the processor, wherein: The memory is used to store computer programs or instructions; The processor is used to execute the computer program or instructions to enable the electronic device to implement the heating control method as described in any one of claims 3 to 5.

10. A computer-readable storage medium for use in electronic devices, characterized in that, The storage medium carries one or more computer programs that can be executed by the electronic device, thereby enabling the electronic device to implement the heating control method as described in any one of claims 3 to 5.

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