Pulse heating control method, device, system and readable storage medium

Abstract

The present application provides a pulse heating control method, device, system and readable storage medium, the method comprising: when the operating state of the battery module meets the pulse heating condition, obtaining the initial temperature of the battery module; determining the pulse current control parameters of the bidirectional power conversion module according to the initial temperature of the battery module; sending a first control instruction to the bidirectional power conversion module according to the pulse current control parameters, wherein the first control instruction is used to control the bidirectional power conversion module to heat the battery module; when the real-time temperature of the battery module is monitored to be greater than or equal to a preset temperature threshold, sending a second control instruction to the bidirectional power conversion module; wherein the second control instruction is used to control the bidirectional power conversion module to stop heating the battery module. In the present application scheme, the pulse current control parameters can be flexibly determined according to the actual temperature of the battery, and then the output pulse current can be adjusted, which is conducive to improving the efficiency of pulse heating.

Description

Technical Field

[0001] The present application relates to the field of new energy technology, and in particular to a pulse heating control method, device, system and readable storage medium. Background Art

[0002] In low temperature environments, the performance of lithium-ion power batteries will be greatly reduced, causing electric vehicles to suffer serious mileage losses, while increasing the operating costs and life loss of electric vehicles. Therefore, before the electric vehicle is driven, the power battery needs to be heated to bring its temperature to the normal operating temperature range. How to achieve power battery heating in a more efficient, energy-saving and life-saving way in low temperature environments has become a key issue for the popularization of electric vehicles in cold regions.

[0003] Low-temperature pulse charging and discharging is a special charging technology for battery heating, which aims to improve battery performance and maintain battery availability in low-temperature environments. In related technologies, one pulse heating method is to achieve mutual heating between two vehicles through a bidirectional DCDC converter and a heating controller, but the use scenarios and implementation conditions of this method are very limited; another pulse heating method is to use a motor and an inverter composed of a three-phase bridge arm to pulse heat the electric vehicle, but since this method generates charging and discharging current by storing and releasing energy in the motor winding, the current size is related to the power battery parameters, the motor winding parameters and characteristics, that is, the pulse current cannot be controlled and adjusted. When heating different lithium-ion battery systems, the heating effect is uneven and it is difficult to meet user needs. Summary of the invention

[0004] The embodiments of the present application provide a pulse heating control method, device, system and readable storage medium, which can at least solve the problem in the related art that the pulse heating current of lithium-ion batteries is difficult to regulate.

[0005] In a first aspect, an embodiment of the present application provides a pulse heating control method, which is applied to a pulse heating system. The pulse heating system includes a bidirectional power conversion module, which is used to connect with a power release unit and a battery module to charge, discharge and pulse heat the battery module. The pulse heating control method includes:

[0006] When the operating state of the battery module meets the pulse heating condition, obtaining the initial temperature of the battery module;

[0007] Determining a pulse current control parameter of the bidirectional power conversion module according to an initial temperature of the battery module;

[0008] Sending a first control instruction to the bidirectional power conversion module according to the pulse current control parameter, wherein the first control instruction is used to control the bidirectional power conversion module to heat the battery module;

[0009] When the real-time temperature of the battery module is monitored to be greater than or equal to a preset temperature threshold, a second control instruction is sent to the bidirectional power conversion module; wherein the second control instruction is used to control the bidirectional power conversion module to stop heating the battery module.

[0010] A second aspect of the embodiment of the present application provides a pulse heating control device, which is applied to a pulse heating system. The pulse heating system includes a bidirectional power conversion module, which is used to connect with a power release unit and a battery module to charge, discharge and pulse heat the battery module. The pulse heating control device includes:

[0011] An acquisition module, used for acquiring an initial temperature of the battery module when the operating state of the battery module meets the pulse heating condition;

[0012] A determination module, used to determine a pulse current control parameter of the bidirectional power conversion module according to an initial temperature of the battery module;

[0013] A first control module, used for sending a first control instruction to the bidirectional power conversion module according to the pulse current control parameter; wherein the first control instruction is used for controlling the bidirectional power conversion module to heat the battery module;

[0014] The second control module is used to send a second control instruction to the bidirectional power conversion module when the real-time temperature of the battery module is monitored to be greater than or equal to a preset temperature threshold; wherein the second control instruction is used to control the bidirectional power conversion module to stop heating the battery module.

[0015] The third aspect of an embodiment of the present application provides a pulse heating system, comprising: a bidirectional power conversion module, a memory and a processor, wherein the bidirectional power conversion module is used to connect to a power release unit and a battery module to charge, discharge and pulse heat the battery module; the processor is used to execute a computer program stored in the memory, and when the processor executes the computer program, it implements each step of the pulse heating control method provided in the first aspect of the embodiment of the present application.

[0016] The fourth aspect of the embodiments of the present application provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, each step of the pulse heating control method provided in the first aspect of the embodiments of the present application is implemented.

[0017] As can be seen from the above, according to the pulse heating control method, device, system and readable storage medium provided by the present application, when the operating state of the battery module meets the pulse heating conditions, the initial temperature of the battery module is obtained; according to the initial temperature of the battery module, the pulse current control parameters of the bidirectional power conversion module are determined; according to the pulse current control parameters, a first control instruction is sent to the bidirectional power conversion module, wherein the first control instruction is used to control the bidirectional power conversion module to heat the battery module; when the real-time temperature of the battery module is monitored to be greater than or equal to the preset temperature threshold, a second control instruction is sent to the bidirectional power conversion module; wherein the second control instruction is used to control the bidirectional power conversion module to stop heating the battery module. In the present application, the pulse current control parameters of the bidirectional power conversion module are determined by the actual temperature state of the battery module, so that the pulse current can be flexibly controlled, the flexibility and freedom of the pulse heating control process are improved, and the working efficiency of the pulse heating is also improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A basic flow chart of a pulse heating control method provided in the first embodiment of the present application;

[0019] Figure 2 A schematic diagram of the structure of a pulse heating management system provided in the first embodiment of the present application;

[0020] Figure 3 A system block diagram of a first bidirectional power conversion module provided in the first embodiment of the present application;

[0021] Figure 4 A system block diagram of a second bidirectional power conversion module provided in the first embodiment of the present application;

[0022] Figure 5 A schematic diagram of the loop structure operation of the bidirectional power conversion module in the first embodiment of the present application;

[0023] Figure 6 It is a schematic diagram of the charge and discharge current in different working states in the pulse heating mode in the first embodiment of the present application;

[0024] Figure 7 is a connection relationship diagram of multiple bidirectional power conversion modules in the first embodiment of the present application;

[0025] Figure 8 This is a schematic diagram of the master-slave relationship between multiple bidirectional power conversion modules in the first embodiment of the present application;

[0026] Fig. 9 This is a structural schematic diagram of a bidirectional power conversion module in an implementation manner of the first embodiment of the present application;

[0027] Fig.10 This is a structural schematic diagram of a bidirectional power conversion module in another implementation manner of the first embodiment of the present application;

[0028] Fig.11 A schematic diagram of a program module of a pulse heating control device provided in the second embodiment of the present application;

[0029] Fig.12 A schematic diagram of the structure of a pulse heating system provided in the third embodiment of the present application. DETAILED DESCRIPTION

[0030] In order to make the purpose, features, and advantages of the invention of this application more obvious and easy to understand, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0031] In the description of the embodiments of the present application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0033] In the embodiments of the present application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0034] In order to solve the problem that the pulse heating current of lithium-ion batteries in the related art is difficult to regulate, the first embodiment of the present application provides a pulse heating control method, which is applied to a pulse heating system. The pulse heating system includes a bidirectional power conversion module, which is used to connect with a power release unit and a battery module to charge and discharge and pulse heat the battery module; Figure 1 The basic flow chart of the pulse heating control method provided in this embodiment includes the following steps:

[0035] Step 101: When the operating state of the battery module meets the pulse heating condition, the initial temperature of the battery module is obtained.

[0036] Specifically, one end of the bidirectional power conversion module can be connected to the power release unit, and the other end can be connected to the battery module, wherein the power release unit can be an AC source or a DC source (grid). The battery module in this embodiment can be a vehicle-mounted battery of a single or multiple electric vehicles, or an independent battery pack, a battery module, etc., which is not limited here. That is, the pulse heating system of this embodiment can realize pulse heating of a single or multiple electric vehicles, independent battery packs and battery modules, and has a wide range of applications. The above-mentioned initial temperature may refer to the surface temperature, core temperature, average temperature, etc. of the battery or battery pack, which is not limited here.

[0037] Step 102: Determine the pulse current control parameters of the bidirectional power conversion module according to the initial temperature of the battery module.

[0038] Specifically, the control parameters of the bidirectional power conversion module for pulse heating of the battery module can be determined according to the initial temperature of the battery module. That is, reasonable control parameters can be determined according to the actual working state of the battery module, thereby improving the pulse heating efficiency and heating effect.

[0039] Step 103: Send a first control instruction to the bidirectional power conversion module according to the pulse current control parameter.

[0040] Specifically, the first control instruction is used to control the bidirectional power conversion module to heat the battery module; after receiving the first control instruction, the bidirectional power conversion module enters a pulse heating state, outputs a pulse current to the battery module, and realizes pulse heating.

[0041] Step 104: When it is monitored that the real-time temperature of the battery module is greater than or equal to a preset temperature threshold, a second control instruction is sent to the bidirectional power conversion module.

[0042] Specifically, the second control instruction is used to control the bidirectional power conversion module to stop heating the battery module. When the real-time temperature of the battery module is monitored to be greater than or equal to the preset temperature threshold, it means that the temperature of the battery module has reached the required temperature value, and the heating of the battery module can be stopped. In addition, in some other specific embodiments, when an abnormality occurs in the battery module, or the battery module no longer has the need to continue pulse heating, a second control instruction can be directly sent to the bidirectional power conversion module, thereby controlling the bidirectional power conversion module to immediately stop heating to ensure that the pulse heating work is carried out safely and efficiently.

[0043] In one implementation of the present embodiment, before obtaining the initial temperature of the battery module as mentioned above, it also includes: after receiving a battery module heating request, obtaining the state parameters of the battery module; wherein the state parameters include at least one of the initial current value, initial voltage value, capacity and initial SOC value of the battery pack in the battery module; and judging whether the operating state of the battery module meets the pulse heating conditions according to the state parameters.

[0044] Specifically, the pulse heating system in this embodiment can be configured with a pulse heating management system (platform), which can monitor the state parameters of the battery module in real time, including but not limited to the real-time voltage, real-time current, capacity, maximum allowable charging voltage, maximum allowable charging current, temperature parameters (maximum, minimum, average) and real-time SOC of the battery pack, etc., so that the battery state can be accurately evaluated based on these state parameters (to determine whether some or all of the above state parameters are within a reasonable range), so that users can understand the health status and available energy of the battery. It is also possible to determine whether the operating state of the battery module meets the pulse heating conditions based on these state parameters, that is, when the battery module is in normal state, it indicates that the pulse heating control process can be started; when the battery module is in abnormal state, an alarm signal can be sent to the system or platform to instruct the system to handle the abnormal state or manually handle it.

[0045] like Figure 2As shown, the pulse heating system of this embodiment may include a pulse heating management system and a bidirectional power conversion module control system. The pulse heating management system can detect the working state of the battery module and comprehensively manage the working process of the bidirectional power conversion module. The bidirectional power conversion module control system can control the bidirectional power conversion module to realize functions such as charging and discharging and pulse heating. The bidirectional power conversion module in this embodiment may refer to an AC-DC bidirectional conversion module. When charging the battery module, the bidirectional power conversion module is in a rectification mode, converting the AC signal into a DC signal, thereby transferring the energy absorbed from the power release unit to the battery module, and the battery module stores energy; when discharging the battery module, the bidirectional power conversion module is in an inverter mode, converting the DC signal into an AC signal, thereby transferring the energy obtained from the battery module to the power release unit, and the battery module releases energy.

[0046] The switching of the rectification and inversion modes of the bidirectional power conversion module can realize the bidirectional flow of energy, thereby realizing the charging and discharging process of the battery module. In this embodiment, the pulse charging and discharging of the battery module can be realized by controlling the periodic switching of the rectification and inversion modes of the bidirectional power conversion module; when the bidirectional power conversion module switches modes at a certain frequency, the battery module can also be continuously charged and discharged at the same frequency, thereby realizing the effect of pulse heating.

[0047] Based on this, if the process of a complete charge and discharge of the battery module is defined as a cycle, during this cycle, when the bidirectional power conversion module is in the rectification mode, the current flows from the bidirectional power conversion module to the battery module to charge the battery module. At this time, the output current of the bidirectional power conversion module is positive (greater than 0), which is recorded as a pulse positive current; when the bidirectional power conversion module is in the inverter mode, the current flows from the battery module to the bidirectional power conversion module to discharge the battery module. At this time, the output current of the bidirectional power conversion module is negative (less than 0), which is recorded as a pulse negative current. Based on this, the pulse current control parameters of the bidirectional power conversion module can be adjusted, and then the pulse current characteristic parameters (waveform, frequency, amplitude and duty cycle of the pulse current) can be adjusted to achieve the regulation of the pulse current. The specific contents are as follows:

[0048] (1) controlling the duration of the rectification and inversion modes of the bidirectional power conversion module, that is, adjusting the pulse current frequency by adjusting the mode switching time within the cycle of the bidirectional power conversion module;

[0049] (2) controlling the proportion of time that the bidirectional power conversion module works in the rectification mode and the inverter mode within a cycle, that is, controlling the proportion of the pulse positive (negative) current within the entire cycle, and adjusting the pulse current duty cycle by adjusting the time point of the rectification (inversion) switching of the bidirectional power conversion module within a cycle;

[0050] (3) controlling the output current of the bidirectional power conversion module in the rectification and inversion modes, that is, adjusting the amplitude of the pulse current for charging and discharging the battery module;

[0051] (4) Control the bidirectional power conversion module to output a constant current in the rectification (inversion) mode within one cycle or change the current in the form of a trapezoidal wave, a sine wave, etc., to achieve pulse current control of different waveforms such as square wave, trapezoidal wave, and sine wave.

[0052] It can be understood that the adjustment range of the pulse current characteristic parameter of the bidirectional power conversion system can be set as follows:

[0053] (1) The pulse current waveform can be selected from square wave, trapezoidal wave or sine wave;

[0054] (2) Pulse current frequency is adjustable;

[0055] (3) The pulse current duty cycle is within the range of (0%, 100%);

[0056] (4) The pulse current amplitude is [-I max , I max ] range, where I max Indicates the maximum current allowed to be output at the rated output power when the DC port voltage of the bidirectional power conversion module is the battery module voltage.

[0057] It should be noted that the above parameters, thresholds and other specific numerical settings of this embodiment are only exemplary and are used to analyze the present invention, and cannot be understood as limiting the present invention. This embodiment uses a bidirectional power conversion module to perform pulse heating on the battery module, and can adjust the waveform, frequency, amplitude and duty cycle of the pulse current, which greatly improves the freedom of pulse current regulation during pulse heating, and is conducive to matching the corresponding pulse current control parameters according to the heating demand and the real-time heating effect, thereby improving the efficiency of pulse heating.

[0058] In one implementation of this embodiment, Figure 2As shown, the pulse heating management system may include a power release unit, a first bidirectional power conversion module, an energy storage unit and a second bidirectional power conversion module. The power release unit may be a power release unit for stably and sustainably delivering energy to the subsequent unit; the first bidirectional power conversion module is used to convert the energy released by the power release unit into energy that can be supported and stored by the energy storage unit, and store energy for the energy storage unit; the energy storage unit is used to store energy and provide energy for subsequent charging or discharging of the battery system; the second bidirectional power conversion module is used to charge or discharge the battery system using the energy stored in the energy storage unit. When the charging state and the discharging state of the battery system are switched at a certain frequency, the pulse heating function of the battery system can be completed; the pulse heating management system can detect whether the status of each subordinate unit (power release unit, first bidirectional power conversion module, energy storage unit and second bidirectional power conversion module) is normal through the communication protocol, and control all units to work according to a reasonable process to ensure the correctness of the execution process of the entire process and the safety of the system operation. The first bidirectional power conversion module may be a bidirectional AC-DC power conversion module, and the second bidirectional power conversion module may be a bidirectional DC-DC power conversion module.

[0059] Furthermore, the battery system of this embodiment may refer to an independent battery pack, a battery module or a vehicle-mounted battery, etc., which is not limited here. The pulse heating system can be used to meet the needs of pulse heating of the battery system in various scenarios, for example: when the energy is provided by the power grid or a stable AC source, the pulse heating system is used to meet the needs of pulse heating of the battery system; when the energy is provided by a stable DC source, the pulse heating system is used to meet the needs of pulse heating of the battery system; the battery system provides energy to meet the needs of pulse heating of another battery system, etc. Similarly, if the electrical signal converted and output by the first bidirectional power conversion module just meets the charging and discharging requirements of the battery system, the energy storage unit and the second bidirectional power conversion module may not work and will be added when there is a need; in actual application, the system device structure can be hierarchically simplified according to the actual use scenario to ensure that the minimum unit that can achieve pulse heating is sufficient, which is not limited here.

[0060] In addition, in some other embodiments, such as Figure 3 As shown, the first bidirectional power conversion module may be a bidirectional AC-DC power conversion module, and the energy conversion between the power release unit and the battery system may be realized through the bidirectional AC-DC power conversion module. Figure 4As shown, the second bidirectional power conversion module can be a bidirectional DC-DC power conversion module, and the energy conversion between the power release unit and the battery system can be directly completed through the second bidirectional power conversion module; of course, the second bidirectional power conversion module can also be used to realize the energy conversion between the energy storage unit and the battery system, thereby realizing functions such as charging and discharging and pulse heating of the battery system.

[0061] In one implementation of the present embodiment, the pulse current control parameters include a target given current of the bidirectional power conversion module during heating; the above-mentioned determination of the pulse current control parameters of the bidirectional power conversion module based on the initial temperature of the battery module includes: based on a preset comparison table, searching for the target current amplitude corresponding to the initial temperature; wherein the preset comparison table is a correspondence table between temperature intervals and pulse current characteristic parameters, and the pulse current characteristic parameters include current amplitude; obtaining the allowable current of the bidirectional power conversion module; wherein the allowable current is the maximum current allowed to be output by the loop structure of the bidirectional power conversion module; and determining the target given current in combination with the target current amplitude and the allowable current.

[0062] Specifically, the temperature of the battery module in the initial state (initial temperature) can be measured by the temperature sensor provided in the battery module. A correspondence table (preset comparison table) between temperature intervals and pulse current characteristic parameters can be pre-stored in the database of the pulse heating system. Each temperature interval in the preset comparison table corresponds to a set of pulse current characteristic parameters. The pulse current characteristic parameters may include current amplitude, pulse frequency, duty cycle, and pulse waveform, etc.; thus, the target current amplitude when heating the battery module can be determined according to the temperature interval in which the initial temperature of the battery module is located. In some other embodiments, if the selected pulse waveform is a trapezoidal wave or a sine wave, the target given current needs to be calculated in combination with the target current amplitude corresponding to the initial temperature, the target pulse frequency, and the above-mentioned allowable current.

[0063] like Figure 5 As shown, in actual application, the loop structure of the bidirectional power conversion module can be an outer loop + inner loop structure, the inner loop is a current loop, and the current loop setting is obtained by the outer loop competition. In the heating state, if the rectification and inversion mode switching speed of the bidirectional power conversion module is fast, the loop response requirement is high. The digital value of the pulse demand current (target current amplitude) is directly compared with the outer loop competition result, and the minimum value is taken as the target given current of the inner loop (current loop). After the current loop itself is adjusted, the output current can just reach the pulse current demand value; at this time, the outer loop is saturated, and the result obtained by the outer loop competition is the maximum current that the bidirectional power conversion module can output. By taking the minimum value between the target current amplitude and the above-mentioned allowable current as the target given current, a protective effect can be played. On the premise of ensuring the safe operation of the bidirectional power conversion module, the pulse heating efficiency and effect can be maximized.

[0064] In one implementation of the present embodiment, the pulse current control parameters also include a first duration threshold of the bidirectional power conversion module operating in the rectification mode and a second duration threshold of the bidirectional power conversion module operating in the inverter mode within a single pulse cycle; the pulse current characteristic parameters also include pulse frequency and duty cycle; the above-mentioned determination of the pulse current control parameters of the bidirectional power conversion module based on the initial temperature of the battery module also includes: based on a preset comparison table, searching for the target pulse frequency and target duty cycle corresponding to the initial temperature; calculating the first duration threshold and the second duration threshold in combination with the target pulse frequency and the target duty cycle.

[0065] Specifically, the pulse heating system can use a timer to count the duration of the bidirectional power conversion module working in various modes, so as to control the bidirectional power conversion module to switch the working mode when the mode switching conditions are met to achieve pulse heating.

[0066] Further, in an implementation manner of this embodiment, the above-mentioned combination of the pulse frequency and the target duty cycle to calculate the first duration threshold and the second duration threshold includes: inputting the target pulse frequency and the target duty cycle into a first calculation formula to calculate the first duration threshold; wherein the first calculation formula is expressed as:

[0067]

[0068] The target pulse frequency and the target duty cycle are input into the second calculation formula to calculate the second duration threshold; wherein the second calculation formula is expressed as:

[0069]

[0070] Among them, T REC represents the first duration threshold, f pulse represents the target pulse frequency, D represents the target duty cycle, T INV Indicates the second duration threshold.

[0071] By calculating the first duration threshold and the second threshold duration, reasonable regulation of the pulse current duty cycle can be achieved, thereby improving the working efficiency of the bidirectional power conversion module.

[0072] Furthermore, in one implementation of the present embodiment, after sending a first control instruction to the bidirectional power conversion module according to the pulse current control parameters, it also includes: when the continuous heating time of the bidirectional power conversion module in the rectification mode is equal to the first time threshold, controlling the bidirectional power conversion module to switch from the rectification mode to the inverter mode and continue to heat the battery module; when the continuous heating time of the bidirectional power conversion module in the inverter mode is equal to the second time threshold, controlling the bidirectional power conversion module to switch from the inverter mode to the rectification mode and continue to heat the battery module.

[0073] Specifically, after the bidirectional power conversion module receives the first control instruction, it enters the pulse heating state, performs pulse heating in the rectification mode or the inverter mode, and the timer starts timing. In a specific implementation, the bidirectional power conversion module starts working in the rectification mode by default to charge the battery module. When the continuous heating time of the bidirectional power conversion module in the rectification mode is equal to T REC When the bidirectional power conversion module switches from the rectification mode to the inverter mode, it starts to work in the inverter mode to discharge the battery module. At the same time, the timer is reset to zero and the next round of timing is started. When the continuous heating time of the bidirectional power conversion module in the rectification mode is equal to T INV When the bidirectional power conversion module switches from the inverter mode to the rectification mode again; at the same time, the timer is reset to zero and the next round of timing is started. The module works in the rectification mode again to charge the battery module, and this cycle repeats.

[0074] It should be noted that in this embodiment, the bidirectional power conversion module has the function of charging and discharging the battery module while performing pulse heating on the battery module:

[0075] (1) In the non-pulse heating mode: the bidirectional power conversion module is controlled in the rectification mode to realize the charging process of the battery module; the bidirectional power conversion module is controlled in the inverter mode to realize the discharging process of the battery module.

[0076] (2) In pulse heating mode: Figure 6 The figure shows the schematic diagram of the charge and discharge current under different states. When the bidirectional power conversion module works in the rectification mode, the current is positive (I rec >0), when working in inverter mode, the current is 0 (I inv =0), the positive pulse charging and heating of the battery module can be realized; when the bidirectional power conversion module works in the rectification mode, the current is 0 (I rec =0), when working in inverter mode, the current is negative (I inv <0), the negative pulse discharge and heating of the battery module can be realized; when the bidirectional power conversion module works in the rectification mode, the current is positive (I rec >0), when working in inverter mode, the current is negative (I inv <0), the positive and negative pulse charging, discharging and heating of the battery module can be realized. This implementation method supports setting different absolute values ​​of charging current and discharging current, that is, |I rec |≠|I inv |.

[0077] In one implementation of the present embodiment, after the bidirectional power conversion module continuously heats the battery module for a period of time equal to a preset time threshold, the real-time temperature value of the battery module is obtained, and the real-time temperature value is compared with the expected temperature value that the battery module needs to reach; when the real-time temperature value is less than the expected temperature value, the pulse current control parameters of the bidirectional power conversion module are updated according to the real-time temperature value, and then a third control instruction is generated according to the updated pulse current control parameters to control the bidirectional power conversion module to heat the battery module according to the updated pulse current control parameters.

[0078] Specifically, the above-mentioned expected temperature value can be less than or equal to the target temperature value (preset temperature threshold) that the battery module ultimately needs to reach. In this way, the pulse current control parameters are adjusted in real time according to the heating effect during the heating process, which is conducive to further improving the pulse heating working efficiency of the bidirectional power conversion module.

[0079] In one implementation of the present embodiment, the pulse heating system is configured with multiple bidirectional power conversion modules; after sending a first control instruction to the bidirectional power conversion module according to the pulse current control parameter, it also includes: sending a first control instruction to all target bidirectional power conversion modules in the pulse heating system that are in the on state; if the number of target bidirectional power conversion modules is greater than one, obtaining the characteristic identification of each target bidirectional power conversion module; according to the characteristic identification, confirming the intra-group level of the target bidirectional power conversion module; wherein the intra-group level includes a host and a slave; controlling the target bidirectional power conversion module corresponding to the host to send a synchronization signal to the target bidirectional power conversion module corresponding to the slave; wherein the synchronization signal is used to control all target bidirectional power conversion modules to synchronously enter rectification mode or inversion mode.

[0080] Specifically, the above implementation provides a parallel strategy for a bidirectional power conversion module, such as Figure 7 As shown, the pulse heating system is equipped with multiple bidirectional power conversion modules, and the multiple bidirectional power conversion modules are used in parallel. During the pulse heating process, all target bidirectional power conversion modules can be controlled to charge or discharge synchronously through synchronization signals, thereby ensuring that all target bidirectional power conversion modules maintain a unified charging or discharging action on the battery module at the same time, ensuring the peak value of the pulse current, maximizing the utilization rate of the pulse current, and increasing the maximum charge and discharge current allowed by the pulse heating, so that the pulse heating system can be used in more pulse heating conditions, and improving the pulse heating system.

[0081] Furthermore, if Figure 8As shown, when the pulse heating system has multiple currently available bidirectional power conversion modules, one of the bidirectional power conversion modules can be determined as the host, and the remaining bidirectional power conversion modules can be determined as slaves. Accordingly, in some specific embodiments, the characteristic identifier can be a serial number identifier generated by the system for distinguishing each target bidirectional power conversion module. After determining the serial number size of each target bidirectional power conversion module, one of them (the one with the smallest or largest serial number) can be determined as the host, and the others can be determined as slaves.

[0082] like Fig. 9 As shown, when multiple AC-DC bidirectional power conversion modules are configured, each bidirectional power conversion module is composed of an AC power conversion part and a DC power conversion part. The AC power conversion part and the DC power conversion part can communicate through the SCI protocol, and can also transmit state quantities through some hardware node signals; the AC power conversion part and the DC power conversion part are respectively provided with their own CAN communication, and usually use DC CAN to communicate with the host computer to obtain module information or control module status and parameters. Different bidirectional power conversion modules also have AC CAN and DC CAN parallel hardware communication interfaces. In addition, different bidirectional power conversion modules also have synchronous signal parallel hardware interfaces, and this synchronous signal parallel hardware interface is connected to the AC power conversion part in each bidirectional power conversion module.

[0083] Based on this, in one embodiment, after sending the first control instruction to the bidirectional power conversion module according to the pulse current control parameter, the operating state of each bidirectional power conversion module in the pulse heating system is detected; when there are at least two target bidirectional power conversion modules in the power-on state, the AC power conversion part of each target bidirectional power conversion module is turned on according to the AC The CAN bus obtains corresponding characteristic identification information, and then according to these characteristic identifications, one of the target bidirectional power conversion modules is confirmed as the host, and the remaining target bidirectional power conversion modules are confirmed as slaves; the pulse current control parameters are set to the corresponding target bidirectional power conversion module through DCCAN communication, and each target bidirectional power conversion module updates its own pulse current control parameters respectively; after the parameter update is completed, the AC power conversion part of each target bidirectional power conversion module obtains two parameters, namely, pulse frequency and duty cycle, from the DC power conversion part, so as to set the frequency and duty cycle of the synchronization signal; after the frequency and duty cycle of the synchronization signal are set, the AC power conversion part corresponding to the host sends a synchronization signal, and the host also sends a hardware node signal to its own DC power conversion part; the AC power conversion parts corresponding to the host and the slave capture the synchronization signal and send a hardware node signal to the DC power conversion part of the slave itself according to the synchronization signal, so as to realize mode switching. During the continuous pulse heating process, if the mode needs to be switched again, the control host can perform the above-mentioned synchronization signal generation, switching control and other processes again; if the pulse heating needs to be stopped, all the bidirectional power conversion modules are controlled to shut down, so that each target bidirectional power conversion module can stop heating the battery module; if the bidirectional power conversion module is set to exit the pulse heating mode, the corresponding AC power conversion part of the host stops sending the synchronization signal.

[0084] Specifically, the AC power conversion part of the bidirectional power conversion module supports the generation and capture of synchronization signals. After the bidirectional power conversion module is turned on, the AC power conversion part is used to summarize the feature identification information and identify the host and generate a synchronization signal. The AC power conversion part corresponding to the host then sends out the generated synchronization signal, and the AC power conversion parts corresponding to the host and the slave capture the synchronization signal sent by the host. In the process of using synchronization signals to achieve synchronous switching of modes, the rising edge of the synchronization signal can control the target bidirectional power conversion module to switch to the rectification mode, and the falling edge can control the target bidirectional power conversion module to switch to the inverter mode, and synchronize twice within one cycle. In this embodiment, the synchronization signal needs to be consistent with the above-mentioned target pulse frequency and target duty cycle. The two parameters can be set to the DC power conversion part through the pulse heating management system via DC CAN communication, and the AC power conversion part needs to obtain the target pulse frequency and target duty cycle from the DC power conversion part through SCI communication. The mode switching of the target bidirectional power conversion module can be completed by the DC power conversion part. Therefore, when the AC power conversion part sends or captures the synchronization signal, the AC power conversion part of each target bidirectional power conversion module sends a hardware node signal to its own DC power conversion part, and then, each DC power conversion part can realize mode switching through this signal.

[0085] In another implementation, for the AC-DC power conversion module, when the DC power conversion part has sufficient resources, the DC power conversion part can also be used to implement the parallel strategy. Fig.10 As shown, when the DC power conversion part is used to implement the parallel strategy, the DC power conversion part confirms the host after the module is turned on. When entering the pulse heating mode, the host sends a synchronization signal, and the slave captures the synchronization signal to complete the switching of the module rectification and inverter modes.

[0086] Specifically, when the DC power conversion part is used to implement the parallel strategy, the DC power conversion part generates a feature identifier, and then the host can be confirmed in combination with each feature identifier. When the DC power conversion part is used to implement the parallel strategy, the DC power conversion part can directly use its own set pulse current control parameters (target pulse frequency, target duty cycle) to switch modes without additional acquisition (from the AC power conversion part or other module components), reducing the transmission requirements of the pulse current control parameters between the AC and DC power conversion parts, and improving the mode switching efficiency. That is, when the DC power conversion part is used to implement the parallel strategy, the DC power conversion part can directly switch modes after capturing the synchronization signal, and the AC power conversion part follows it to switch modes, reducing the transmission process of the hardware node signal between the AC and DC power conversion parts, simplifying the overall path of the pulse heating control, and further improving the mode switching efficiency and pulse heating efficiency.

[0087] In some other implementations, a DC-DC bidirectional power conversion module may also be used as the bidirectional power conversion module in the pulse heating system of this embodiment, which is not limited here.

[0088] It is understandable that in the related art, in order to improve the ability of the bidirectional power conversion module to output large current, multiple bidirectional power conversion modules are used in parallel. In the pulse heating mode, when multiple bidirectional power conversion modules are in parallel, if the working states of each bidirectional power conversion module are inconsistent, that is, some bidirectional power conversion modules charge the battery module and some bidirectional power conversion modules discharge the battery module, so that part of the charging current and the discharging current are offset, the pulse current amplitude is pulled down, and it is difficult to achieve the purpose of improving the current output capacity, and it may cause the control of parameters such as the pulse current duty cycle and frequency to be less than ideal. Due to the different power-on timing of each bidirectional power conversion module and the different time of receiving the first control instruction, the target bidirectional power conversion module may not be able to enter the pulse heating mode at the same time, and then the target bidirectional power conversion module cannot charge and discharge the battery module synchronously. However, this embodiment can control each target bidirectional power conversion module to switch to the rectification mode or the inverter mode at the same time through the synchronization signal, and then charge and discharge the battery module synchronously, so as to achieve the purpose of using a large current to perform pulse heating on the battery module, which is conducive to shortening the pulse heating time and improving the utilization rate of the pulse current.

[0089] Based on the technical solution of the above-mentioned embodiment of the present application, when the operating state of the battery module meets the pulse heating condition, the initial temperature of the battery module is obtained; according to the initial temperature of the battery module, the pulse current control parameters of the bidirectional power conversion module are determined; according to the pulse current control parameters, a first control instruction is sent to the bidirectional power conversion module, wherein the first control instruction is used to control the bidirectional power conversion module to heat the battery module; when the real-time temperature of the battery module is monitored to be greater than or equal to the preset temperature threshold, a second control instruction is sent to the bidirectional power conversion module; wherein the second control instruction is used to control the bidirectional power conversion module to stop heating the battery module. In the solution of the present application, the pulse current control parameters of the bidirectional power conversion module are determined by the actual temperature state of the battery module, so that the pulse current can be flexibly regulated, and the flexibility and freedom of the pulse heating control process are improved.

[0090] Fig.11 A pulse heating control device is provided in the second embodiment of the present application. It is applied to a pulse heating system, and the pulse heating system includes a bidirectional power conversion module, which is used to connect with a power release unit and a battery module to charge and discharge and pulse heat the battery module; the pulse heating control device can be applied to the aforementioned pulse heating control method. Fig.11As shown, the pulse heating control device mainly includes:

[0091] An acquisition module 1101 is used to acquire an initial temperature of the battery module when the operating state of the battery module meets the pulse heating condition;

[0092] A determination module 1102, configured to determine a pulse current control parameter of the bidirectional power conversion module according to an initial temperature of the battery module;

[0093] The first control module 1103 is used to send a first control instruction to the bidirectional power conversion module according to the pulse current control parameter; wherein the first control instruction is used to control the bidirectional power conversion module to heat the battery module;

[0094] The second control module 1104 is used to send a second control instruction to the bidirectional power conversion module when the real-time temperature of the battery module is monitored to be greater than or equal to a preset temperature threshold; wherein the second control instruction is used to control the bidirectional power conversion module to stop heating the battery module.

[0095] In some implementations of the present embodiment, a judgment module is also included, and the judgment module is used to perform the following functions before obtaining the initial temperature of the battery module: after receiving a heating request for the battery module, obtaining the state parameters of the battery module; wherein the state parameters include at least one of the initial current value, initial voltage value, capacity and initial SOC value of the battery pack in the battery module; and judging whether the operating state of the battery module meets the pulse heating conditions according to the state parameters.

[0096] In some implementations of the present embodiment, the pulse current control parameters include a target given current of the bidirectional power conversion module during heating; the determination module is specifically used to: based on a preset comparison table, search for the target current amplitude corresponding to the initial temperature; wherein the preset comparison table is a correspondence table between temperature intervals and pulse current characteristic parameters, and the pulse current characteristic parameters include current amplitude; obtain the allowable current of the bidirectional power conversion module; wherein the allowable current is the maximum current allowed to be output by the loop structure of the bidirectional power conversion module; and determine the target given current in combination with the target current amplitude and the allowable current.

[0097] In some implementations of the present embodiment, the pulse current control parameters also include a first duration threshold of the bidirectional power conversion module operating in the rectification mode and a second duration threshold of the bidirectional power conversion module operating in the inverter mode within a single pulse period; the pulse current characteristic parameters also include pulse frequency and duty cycle; the determination module is specifically used to: based on a preset comparison table, search for the target pulse frequency and target duty cycle corresponding to the initial temperature; and calculate the first duration threshold and the second duration threshold in combination with the target pulse frequency and the target duty cycle.

[0098] Further, in some implementations of this embodiment, correspondingly, when the determination module performs the above-mentioned function of combining the target pulse frequency and the target duty cycle to calculate the first duration threshold and the second duration threshold, it is specifically used to: input the target pulse frequency and the target duty cycle into a first calculation formula to calculate the first duration threshold; wherein the first calculation formula is expressed as:

[0099]

[0100] The target pulse frequency and the target duty cycle are input into the second calculation formula to calculate the second duration threshold; wherein the second calculation formula is expressed as:

[0101]

[0102] Among them, T REC represents the first duration threshold, f pulse represents the target pulse frequency, D represents the target duty cycle, T INV Indicates the second duration threshold.

[0103] In some implementations of the present embodiment, after sending a first control instruction to the bidirectional power conversion module according to the pulse current control parameters; the first control module is also used to: when the continuous heating time of the bidirectional power conversion module in the rectification mode is equal to the first time threshold, control the bidirectional power conversion module to switch from the rectification mode to the inverter mode and continue to heat the battery module; when the continuous heating time of the bidirectional power conversion module in the inverter mode is equal to the second time threshold, control the bidirectional power conversion module to switch from the inverter mode to the rectification mode and continue to heat the battery module.

[0104] In some implementations of the present embodiment, the pulse heating system is configured with multiple bidirectional power conversion modules; the first control module is also specifically used to: after sending a first control instruction to the bidirectional power conversion module according to the pulse current control parameter, send a first control instruction to all target bidirectional power conversion modules in the pulse heating system that are in the on state; if the number of target bidirectional power conversion modules is greater than one, obtain the characteristic identification of each target bidirectional power conversion module; according to the characteristic identification, confirm the intra-group level of the target bidirectional power conversion module; wherein, the intra-group level includes a host and a slave; control the target bidirectional power conversion module corresponding to the host to send a synchronization signal to the target bidirectional power conversion module corresponding to the slave; wherein the synchronization signal is used to control all target bidirectional power conversion modules to synchronously enter rectification mode or inversion mode.

[0105] According to the pulse heating control device provided in this embodiment, when the operating state of the battery module meets the pulse heating condition, the initial temperature of the battery module is obtained; according to the initial temperature of the battery module, the pulse current control parameters of the bidirectional power conversion module are determined; according to the pulse current control parameters, a first control instruction is sent to the bidirectional power conversion module, wherein the first control instruction is used to control the bidirectional power conversion module to heat the battery module; when the real-time temperature of the battery module is monitored to be greater than or equal to the preset temperature threshold, a second control instruction is sent to the bidirectional power conversion module; wherein the second control instruction is used to control the bidirectional power conversion module to stop heating the battery module. In the present application scheme, the pulse current control parameters of the bidirectional power conversion module are determined by the actual temperature state of the battery module, so that the pulse current can be flexibly regulated, thereby improving the flexibility and freedom of the pulse heating control process.

[0106] Fig.12 A pulse heating system is provided in the third embodiment of the present application. The pulse heating system can be used to implement the pulse heating control method in the above embodiment, mainly including:

[0107] A memory 1201, a processor 1202, a computer program 1203 stored in the memory 1201 and executable on the processor 1202, and a bidirectional power conversion module 1204 communicatively connected to the processor 1202. The memory 1201 and the processor 1202 are connected by communication. When the processor 1202 executes the computer program 1203, the method of the aforementioned embodiment is implemented. Among them, the number of processors 1202 may be one or more. Specifically, the processor 1202 may include a processor configured in the above-mentioned pulse heating management system and a processor configured in the above-mentioned bidirectional power conversion module management system. The bidirectional power conversion module 1204 may also be one or more. The bidirectional power conversion module 1204 is connected to the power release unit, and the bidirectional power conversion module 1204 is used to connect to the battery module to charge, discharge and pulse heat the battery module.

[0108] The memory 1201 may be a high-speed random access memory (RAM) memory, or a non-volatile memory, such as a disk memory. The memory 1201 is used to store executable program codes, and the processor 1202 is coupled to the memory 1201 .

[0109] Furthermore, the embodiment of the present application also provides a computer-readable storage medium, which can be arranged in the above-mentioned pulse heating system. The computer-readable storage medium can be the above-mentioned Fig.12 Memory in the illustrated embodiment.

[0110] The computer readable storage medium stores a computer program, and when the program is executed by the processor, the pulse heating control method in the aforementioned embodiment is implemented. Furthermore, the computer storable medium can also be a U disk, a mobile hard disk, a read-only memory (ROM), a RAM, a magnetic disk or an optical disk, and other media that can store program codes.

[0111] In the several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of modules is only a logical function division. There may be other division methods in actual implementation, such as multiple modules or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or modules, which can be electrical, mechanical or other forms.

[0112] The modules described as separate components may or may not be physically separated, and the components shown as modules may or may not be physical modules, that is, they may be located in one place or distributed on multiple network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0113] In addition, each functional module in each embodiment of the present application can be integrated into a processing module, or each module can exist physically separately, or two or more modules can be integrated into one module. The above integrated modules can be implemented in the form of hardware or software functional modules.

[0114] If the integrated module is implemented in the form of a software function 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 the present application, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, which is stored in a readable storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the various embodiments of the present application. The aforementioned readable storage medium includes: various media that can store program codes, such as USB flash drives, mobile hard drives, ROM, RAM, magnetic disks, or optical disks.

[0115] It should be noted that, for the above-mentioned method embodiments, for the sake of simplicity of description, they are all expressed as a series of action combinations, but those skilled in the art should be aware that the present application is not limited by the described action sequence, because according to the present application, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present application.

[0116] In the above embodiments, the descriptions of each embodiment and its implementation methods have different emphases. For parts that are not described in detail in a certain embodiment or implementation method, reference can be made to the relevant descriptions of other embodiments or implementation methods.

[0117] The above is a description of the pulse heating control method, device, system and readable storage medium provided in the present application. For technicians in this field, according to the ideas of the embodiments of the present application, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A pulse heating control method, characterized in that: Applied to a pulse heating system, the pulse heating system comprises a bidirectional power conversion module, the bidirectional power conversion module is used to connect with a power release unit and a battery module to charge, discharge and pulse heat the battery module; The pulse heating control method comprises: When the operating state of the battery module meets the pulse heating condition, obtaining the initial temperature of the battery module; Determining a pulse current control parameter of a bidirectional power conversion module according to an initial temperature of the battery module; Sending a first control instruction to the bidirectional power conversion module according to the pulse current control parameter; wherein the first control instruction is used to control the bidirectional power conversion module to heat the battery module; When it is monitored that the real-time temperature of the battery module is greater than or equal to a preset temperature threshold, a second control instruction is sent to the bidirectional power conversion module; wherein the second control instruction is used to control the bidirectional power conversion module to stop heating the battery module.

2. The pulse heating control method according to claim 1, characterized in that: When the operating state of the battery module meets the pulse heating condition, before obtaining the initial temperature of the battery module, the method further includes: After receiving a battery module heating request, obtaining a state parameter of the battery module; wherein the state parameter includes at least one of an initial current value, an initial voltage value, a capacity, and an initial SOC value of a battery pack in the battery module; It is determined whether the operating state of the battery module meets the pulse heating condition according to the state parameter.

3. The pulse heating control method according to claim 1, characterized in that: The pulse current control parameter includes a target given current of the bidirectional power conversion module during heating; Determining the pulse current control parameter of the bidirectional power conversion module according to the initial temperature of the battery module includes: Based on a preset comparison table, searching for the target current amplitude corresponding to the initial temperature; wherein the preset comparison table is a correspondence table between temperature intervals and pulse current characteristic parameters, and the pulse current characteristic parameters include current amplitude; Acquire the allowable current of the bidirectional power conversion module; wherein the allowable current is the maximum current that the loop structure of the bidirectional power conversion module allows to output; The target given current is determined by combining the target current amplitude and the allowed current.

4. The pulse heating control method according to claim 3, characterized in that: The pulse current control parameter also includes a first time threshold for the bidirectional power conversion module to work in the rectification mode and a second time threshold for the bidirectional power conversion module to work in the inverter mode within a single pulse period; The pulse current characteristic parameters also include pulse frequency and duty cycle; The step of determining the pulse current control parameter of the bidirectional power conversion module according to the initial temperature of the battery module further includes: Based on the preset comparison table, searching for the target pulse frequency and the target duty cycle corresponding to the initial temperature; The first duration threshold and the second duration threshold are calculated in combination with the target pulse frequency and the target duty cycle.

5. The pulse heating control method according to claim 4, characterized in that: The calculating the first duration threshold and the second duration threshold by combining the pulse frequency and the target duty cycle includes: The target pulse frequency and the target duty cycle are input into a first calculation formula to calculate the first duration threshold; wherein the first calculation formula is expressed as: The target pulse frequency and the target duty cycle are input into a second calculation formula to calculate the second duration threshold; wherein the second calculation formula is expressed as: Among them, T REC represents the first duration threshold, f pulse represents the target pulse frequency, D represents the target duty cycle, T INV Indicates the second duration threshold.

6. The pulse heating control method according to claim 4, characterized in that: After sending the first control instruction to the bidirectional power conversion module according to the pulse current control parameter, the method further includes: When the continuous heating time of the bidirectional power conversion module in the rectification mode is equal to the first time threshold, controlling the bidirectional power conversion module to switch from the rectification mode to the inverter mode and continue to heat the battery module; When the continuous heating time of the bidirectional power conversion module in the inverter mode is equal to the second time threshold, the bidirectional power conversion module is controlled to switch from the inverter mode to the rectification mode and continue to heat the battery module.

7. A pulse heating control device, characterized in that: Applied to a pulse heating system, the pulse heating system comprises a bidirectional power conversion module, the bidirectional power conversion module is used to connect with a power release unit and a battery module to charge, discharge and pulse heat the battery module; The pulse heating control device comprises: an acquisition module, used for acquiring an initial temperature of the battery module when the operating state of the battery module meets the pulse heating condition; A determination module, used to determine a pulse current control parameter of a bidirectional power conversion module according to an initial temperature of the battery module; A first control module, configured to send a first control instruction to the bidirectional power conversion module according to the pulse current control parameter; wherein the first control instruction is configured to control the bidirectional power conversion module to heat the battery module; The second control module is used to send a second control instruction to the bidirectional power conversion module when it is monitored that the real-time temperature of the battery module is greater than or equal to a preset temperature threshold; wherein the second control instruction is used to control the bidirectional power conversion module to stop heating the battery module.

8. A pulse heating system, characterized in that: It includes a bidirectional power conversion module, a memory and a processor, wherein: The bidirectional power conversion module is used to connect with the power release unit and the battery module to charge, discharge and pulse heat the battery module; The processor is used to execute the computer program stored in the memory; When the processor executes the computer program, the steps in the method according to any one of claims 1 to 6 are implemented.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps in the method according to any one of claims 1 to 6 are implemented.

Images