Charge / discharge circuits, methods, computing devices, and control devices thereof.

Abstract

Embodiments of this application provide a charge / discharge circuit, method, computing device, and control device, wherein a regulating switching module is connected between a first energy storage element and a second switching module, thereby enabling self-heating of the battery using the alternating current generated by the charge / discharge circuit between the drive motor and the battery. This application allows for flexible adjustment of the charge / discharge circuit between the power battery and the energy storage element, and in particular, enables battery heating based on a dual-drive motor scenario, reducing costs while simultaneously providing a means for self-heating the battery by flexibly adjusting the charge / discharge of the dual-drive motor, thereby meeting heating demands in various scenarios.

Description

Technical Field

[0001] (Cross - reference to related applications) This application claims the priority of Chinese Patent Application No. 202310618088.2, titled "Charge - Discharge Circuit, Method, Computing Device, and Its Control Device", filed on May 29, 2023, and all the contents of this application are incorporated herein by reference.

[0002] This application relates to the field of battery technology, particularly to charge - discharge circuits, methods, computing devices, and their control devices.

Background Art

[0003] Power modules such as rechargeable batteries have advantages such as high energy density, cycle charging capability, safety, and environmental friendliness. Therefore, power modules are widely applied in fields such as new - energy vehicles, household appliances, and energy - storage systems. With the development of battery technology and the demands of different vehicles and usage scenarios, the requirements for the self - heating performance of batteries are also becoming increasingly diverse.

[0004] Here, regarding the self - heating means of batteries in the usage scenario of dual - drive motors, the heating means is single, the cost is high, and how to flexibly adjust the charge - discharge of the power module according to the demands of various scenarios and flexibly adjust the self - heating means of the battery is an urgent problem to be solved. The above description is only for providing background - technical information related to this application and does not necessarily constitute prior art.

Summary of the Invention

[0005] Embodiments of this application provide a charge / discharge circuit, method, computing device and control device thereof, which achieve battery self-heating by utilizing the alternating current generated by the charge / discharge circuit between the drive motor and the battery. This application allows for flexible adjustment of the charge / discharge circuit between the power battery and the energy storage element without changing the original motor structure. In particular, this application achieves battery heating based on dual-drive motor scenarios, reducing costs while flexibly adjusting the charge / discharge of the dual-drive motor to provide a means for battery self-heating, thereby meeting heating demands in various scenarios.

[0006] Specifically, by controlling the on / off state of the bridge arms of different phases in the switching module, the magnitude of the impedance required for heating can be controlled and adjusted, thereby achieving the maximum current for battery heating. Drawing out a single motor neutral point not only reduces the heating change point of dual motors but also enables the adjustment of heating impedance parameters, improving the system compatibility of the motors and increasing the battery heating speed.

[0007] According to a first aspect, the present application provides a charge / discharge circuit including a power module, a first heating module, a second heating module, and a regulating switching module, wherein the first heating module includes a connected first energy storage element and a first switching module, the second heating module includes a connected second energy storage element and a second switching module, both of which are connected to the power module, and the regulating switching module is connected between the first energy storage element and the second switching module.

[0008] In the charge / discharge circuit according to the embodiment of this application, the first heating module and the second heating module may correspond to two sets of drive motors, and a control switching module connects the first energy storage element in one set of motors to the second switching module in the other set of motors. In the dual-drive motor scenario, the charge / discharge circuit between the power battery and the energy storage element is flexibly adjusted to realize self-heating of the battery of the dual motors. By adjusting the first and second switching modules in the two sets of motors, the charge / discharge of the power modules is flexibly adjusted, and the self-heating method of the power battery is flexibly adjusted to suit the heating demands of various scenarios, thereby reducing costs. By flexibly adjusting the charge / discharge of the dual-drive motors to provide a means for self-heating the battery, the heating demands of various scenarios can be met.

[0009] In some embodiments, the first energy storage element includes a motor winding, and the regulating switching module is connected between the neutral point of the motor winding and the second switching module.

[0010] The charge / discharge circuit according to the embodiment of this application is connected to a second switching module of another set of motors via the neutral point of the motor winding of the first energy storage element during the charge / discharge heating process, thereby achieving self-heating of the battery of the dual motors in a dual-drive motor scenario. By adjusting the switching modules in the two sets of motors, the charge / discharge impedance of the power module can be flexibly adjusted, further adjusting the spike current of the charge / discharge circuit and improving the heating speed. The self-heating method of the power battery can be flexibly adjusted to suit the heating needs of various scenarios, reducing costs, and the charging and discharging of the dual-drive motor can be flexibly adjusted to provide a means for self-heating the battery, thereby meeting the heating needs in various scenarios.

[0011] In some embodiments, the second switching module includes a group of bridge arms, and the regulating switching module is connected between the first energy storage element and the upper and lower bridge arms of any phase of the bridge arm group.

[0012] In the charge / discharge circuit according to the embodiment of this application, the first switching module and the second switching module correspond to the motor controllers of the two sets of motors. During the charge / discharge heating process, the neutral point of the motor winding of the first energy storage element is connected to one of the phase bridge arms of the bridge arm group of the second switching module. Energy storage and energy supply are performed during the charge / discharge process by any one phase bridge arm of the first and second switching modules, improving the charge / discharge efficiency between the power modules and enabling self-heating of the power modules. By controlling the on / off state of the bridge arms of different phases of the switching modules, the magnitude of the impedance required for heating can be controlled and adjusted, thereby achieving the maximum current for battery heating. By drawing only one motor neutral point, the heating change point of the dual motor is reduced, and the adjustability of the heating impedance parameter is realized, improving the system compatibility of the motor and improving the heating speed of the battery.

[0013] According to a second aspect, the present application provides a computing device including a control module and a charge / discharge circuit as described in the first aspect, wherein the control module is connected to a first switching module, a second switching module, and a regulating switching module.

[0014] The computing device according to the embodiment of this application connects a first energy storage element in one set of motors to a second switching module in another set of motors using a control module and a switching module for adjusting the charge / discharge circuit, thereby enabling self-heating of the batteries of the dual motors in a dual-drive motor scenario. By adjusting the switching modules in the two sets of motors, the charging and discharging of the power modules can be flexibly adjusted, and the self-heating method of the power batteries can be flexibly adjusted to suit the heating demands of various scenarios, thereby reducing costs. At the same time, the charging and discharging of the dual-drive motors can be flexibly adjusted to provide a means for self-heating the batteries, thereby meeting the heating demands in various scenarios.

[0015] According to a third aspect, the present application provides a charge / discharge control method for application to a computing device of the second aspect, which includes controlling a control switching module to be turned on when heating conditions are met, and controlling a power module to form a battery charge / discharge circuit with a first heating module and a second heating module to perform charging and discharging.

[0016] The charge / discharge control method according to the embodiment of this application controls the regulating switching module to be turned on based on a battery heating command, and in a dual-drive motor scenario, it enables self-heating of the battery of a dual motor by flexibly adjusting the charge / discharge circuit between the power battery and the energy storage element without changing the circuit structure, and flexibly adjusts the charge / discharge of the power module by adjusting the first and second switching modules in the two sets of motors, and further flexibly adjusts the self-heating method of the power battery to suit the heating demands of various scenarios, thereby reducing costs and simultaneously enabling self-heating of the battery by flexibly adjusting the charge / discharge of the dual-drive motor, thereby meeting the heating demands in various scenarios.

[0017] In some embodiments, controlling a power module to form a battery charge / discharge circuit with a first heating module and a second heating module and perform charging and discharging includes controlling a power module to form a first battery charge / discharge circuit with a first energy storage element and perform charging and discharging, or controlling a power module to form a second battery charge / discharge circuit with a first energy storage element and a second energy storage element and perform charging and discharging.

[0018] The charge / discharge control method according to the embodiment of this application specifically controls the power module to perform charging and discharging by forming a first energy storage element and a first battery charge / discharge circuit, or controls the power module to perform charging and discharging by forming a first energy storage element, a second energy storage element and a second battery charge / discharge circuit. This allows for flexible adjustment of the self-heating method of the power battery to adapt to the heating demands of various scenarios, thereby reducing costs and simultaneously enabling flexible adjustment of the charging and discharging of the dual drive motor to perform self-heating of the battery, thereby meeting the heating demands of various scenarios.

[0019] In some embodiments, controlling a power module to form a battery charge / discharge circuit with a first heating module and a second heating module to perform charging and discharging includes obtaining parameters of the power module and determining the number of motor windings of the first and / or second energy storage elements in the battery charge / discharge circuit based on the parameters.

[0020] The charge / discharge control method according to the embodiment of this application determines different heating demand scenarios based on the parameters of the power module to be acquired, further adapts to the corresponding heating mode, and selects the most appropriate heating means based on the state of the power module, thereby improving the flexible adjustability of charge / discharge and the ability to adapt to scenarios. At the same time as reducing costs, it is possible to flexibly adjust the charge / discharge of the dual drive motor to provide a self-heating means for the battery, thereby meeting heating demands in various scenarios.

[0021] In some embodiments, controlling a power module to form a first battery charge / discharge circuit with a first energy storage element and perform charging and discharging includes controlling a corresponding number of bridge arms in a first switching module to be turned on, controlling a corresponding number of motor windings in the first energy storage element to be turned on, and regulating the power module to form a first battery charge / discharge circuit with the first energy storage element and perform charging and discharging.

[0022] The charge / discharge control method according to the embodiment of this application, when heating control is performed by the inductance of a single motor, enables flexible adjustment of the charging and discharging of a dual-drive motor to perform battery self-heating by flexibly adjusting the number of inductance connections in the single motor, thereby meeting heating demands in various scenarios.

[0023] In some embodiments, controlling a power module to form a first battery charge / discharge circuit with a first energy storage element and perform charging and discharging includes, in a first period, controlling the power module to charge the first energy storage element; in a second period, controlling the first energy storage element to freewheel; and in a third period, controlling the first energy storage element to charge the power module, where the control of the first, second, and third periods is performed alternately and continuously.

[0024] In the embodiment of this application, when specifically adjusting the charging and discharging between the power module and the first energy storage element, the power module is first controlled to charge the first energy storage element, then the first energy storage element is controlled to freewheel to buffer the current between itself and the charging / discharging circuit and stabilize the voltage of the energy storage element, and finally the first energy storage element is controlled to charge the power module. Self-heating of the power module is achieved by alternately converting the charging and discharging between the power module and the first energy storage element. During the self-heating process of the power module, continuous self-heating is achieved by alternating control of the first period, the second period, and the third period.

[0025] In some embodiments, a first switching module includes a first group of bridge arms, a second switching module includes a second group of bridge arms, a first energy storage element includes a motor winding, a regulating switching module is connected between the neutral point of the motor winding and the upper and lower bridge arm connection point of a bridge arm of any phase in the second group of bridge arms, the bridge arm of the second group of bridge arms connected to the regulating switching module is a target bridge arm, and controlling the power module to form a first battery charge / discharge circuit with the first energy storage element to perform charging and discharging includes, in a first period, controlling the upper bridge arm of any phase in the first group of bridge arms to be turned on and the lower bridge arm of the target bridge arm of the second group of bridge arms to be turned on, in a second period, controlling the lower bridge arm of the target bridge arm to be turned off, and in a third period, controlling the upper bridge arm of the first group of bridge arms to be turned off and the lower bridge arm corresponding to the turned-off bridge arm to be turned on. Here, the control of the first, second, and third periods is carried out alternately and continuously.

[0026] Specifically, when adjusting the charge and discharge between the power module and the first energy storage element, the charge and discharge control method according to the embodiment of the present application realizes the alternation of charge and discharge between the power module and the first energy storage element by specifically controlling the on and off of different bridge arm groups of the first switching module and the second switching module, and realizes self-heating of the power module. In the self-heating process of the power module, continuous self-heating is realized by the alternating control of the first period, the second period and the third period.

[0027] In some embodiments, the first switching module includes a first bridge arm group, the second switching module includes a second bridge arm group, the first energy storage element includes a motor winding, the adjustment switching module is connected between the neutral point of the motor winding and the upper and lower bridge arm connection points of any phase of the second bridge arm group, and the bridge arm of the second bridge arm group connected to the adjustment switching module is the target bridge arm. Controlling the power module to form a first battery charge and discharge circuit with the first energy storage element to perform charge and discharge includes: in the first period, controlling any lower bridge arm of the first bridge arm group to be turned on and the upper bridge arm of the target bridge arm of the second bridge arm group to be turned on; in the second period, controlling the upper bridge arm of the target bridge arm to be turned off; and in the third period, controlling the turned-on lower bridge arm of the first bridge arm group to be turned off and the upper bridge arm corresponding to the turned-off bridge arm to be turned on. Here, the control of the first period, the second period and the third period is continuously performed alternately.

[0028] The charge-discharge control method according to the embodiments of the present application specifically realizes the conversion of the charge and discharge between the power module and the first energy storage element by alternately controlling the on and off of different bridge arm groups of the first switching module and the second switching module when adjusting the charge and discharge between the power module and the first energy storage element, and realizes self-heating of the power module. In the self-heating process of the power module, continuous self-heating is realized by alternately controlling the first period, the second period, and the third period.

[0029] In some embodiments, controlling the power module to form a second battery charge-discharge circuit with the first energy storage element and the second energy storage element to perform charge and discharge includes controlling the corresponding number of bridge arms in the first switching module and the corresponding number of motor windings in the first energy storage element to be turned on, controlling the corresponding number of bridge arms in the second switching module and the corresponding number of motor windings in the second energy storage element to be turned on, and adjusting the power module, the first energy storage element, and the second energy storage element to form a second battery charge-discharge circuit to perform charge and discharge.

[0030] When the heating control is performed according to the inductance of the dual motor, the charge-discharge control method according to the embodiments of the present application realizes flexible adjustment of the charge and discharge of the dual-drive motor and performs the self-heating means of the battery by flexibly adjusting different inductance connections in the dual motor, thereby meeting the heating requirements in various scenarios.

[0031] In some embodiments, controlling a power module to form a second battery charge / discharge circuit with a first energy storage element and a second energy storage element to perform charging and discharging includes, in a first period, controlling the power module to charge the first energy storage element and the second energy storage element; in a second period, controlling the first energy storage element and the second energy storage element to freewheel; and in a third period, controlling the first energy storage element and the second energy storage element to charge the power module, where the control of the first, second, and third periods is performed alternately and continuously.

[0032] In the embodiment of this application, when specifically adjusting the charging and discharging between the power module and the first and second energy storage elements, the power module is first controlled to charge the first and second energy storage elements, then controlled to allow the first and second energy storage elements to freewheel, thereby achieving current buffering between the charging and discharging circuits and stabilization of the voltage of the energy storage elements, and finally controlled to allow the first and second energy storage elements to charge the power module, thereby achieving self-heating of the power module by alternately converting the charging and discharging between the power module and the first energy storage element. During the self-heating process of the power module, continuous self-heating is achieved by alternating control of the first, second, and third periods.

[0033] In some embodiments, the first switching module includes a first group of bridge arms, the second switching module includes a second group of bridge arms, the first energy storage element includes a motor winding, the regulating switching module is connected between the neutral point of the motor winding and the upper and lower bridge arm connection point of a bridge arm of any phase in the second group of bridge arms, the bridge arm in the second group of bridge arms connected to the regulating switching module is a target bridge arm, and the power module controls the first and second energy storage elements to form a second battery charge / discharge circuit and perform charging and discharging. This includes controlling the system so that in a first period, an upper bridge arm of any phase in the first group of bridge arms is turned on, and a lower bridge arm of at least one phase of the remaining bridge arms in the second group of bridge arms (excluding the target bridge arm) is turned on; in a second period, the turned-on bridge arm in the second group of bridge arms is turned off; and in a third period, the turned-on upper bridge arm in the first group of bridge arms is turned off, and the lower bridge arm corresponding to the turned-off bridge arm is turned on. Here, the control for the first, second, and third periods is performed alternately and continuously.

[0034] The charge / discharge control method according to the embodiment of this application specifically controls the on / off switching of different bridge arm groups of the first and second switching modules when adjusting the charge / discharge between the power module and the first and second energy storage elements, thereby achieving alternating charge / discharge between the power module and the first and second energy storage elements, and achieving self-heating of the power module. During the self-heating process of the power module, continuous self-heating is achieved by alternating control of the first, second, and third periods.

[0035] In some embodiments, the first switching module includes a first group of bridge arms, the second switching module includes a second group of bridge arms, the first energy storage element includes a motor winding, the regulating switching module is connected to the neutral point of the motor winding and to the upper and lower bridge arm connection point of any phase bridge arm of the second group of bridge arms, the bridge arm of the second group of bridge arms connected to the regulating switching module is a target bridge arm, and the power module controls the first and second energy storage elements to form a second battery charge / discharge circuit and perform charging and discharging. This includes controlling the following during a first period: turning on a lower bridge arm of any phase in the first group of bridge arms, and turning on an upper bridge arm of at least one phase of the remaining bridge arms in the second group of bridge arms, excluding the target bridge arm; controlling the following during a second period: turning off the turned-on bridge arm in the second group of bridge arms; and controlling the following during a third period: turning off the turned-on lower bridge arm in the first group of bridge arms, and turning on the upper bridge arm corresponding to the turned-off bridge arm. Here, the control during the first, second, and third periods is performed alternately and continuously.

[0036] The charge / discharge control method according to the embodiment of this application specifically controls the on / off switching of different bridge arm groups of the first and second switching modules when adjusting the charge / discharge between the power module and the first and second energy storage elements, thereby achieving alternating charge / discharge between the power module and the first and second energy storage elements, and achieving self-heating of the power module. During the self-heating process of the power module, continuous self-heating is achieved by alternating control of the first, second, and third periods.

[0037] In some embodiments, controlling a power module to form a second battery charge / discharge circuit with a first energy storage element and a second energy storage element to perform charging and discharging includes, in a first period, controlling the power module to charge the first energy storage element; in a second period, controlling the first and second energy storage elements to freewheel; and in a third period, controlling the first and second energy storage elements to charge the power module, where the control of the first, second, and third periods is performed alternately and continuously.

[0038] The charge-discharge control method according to the embodiment of this application, when adjusting the charge-discharge between the power module and the first and second energy storage elements, first controls the power module to charge the first energy storage element, then controls the first and second energy storage elements to freewheel, thereby achieving current buffering between the charge-discharge circuits and stabilization of the voltage of the energy storage elements, and finally controls the first and second energy storage elements to charge the power module, thereby achieving self-heating of the power module by alternately converting the charge-discharge between the power module and the first energy storage element. During the self-heating process of the power module, continuous self-heating is achieved by alternating control of the first, second, and third periods.

[0039] In some embodiments, the first switching module includes a first group of bridge arms, the second switching module includes a second group of bridge arms, the first energy storage element includes a motor winding, the regulating switching module is connected between the neutral point of the motor winding and the upper and lower bridge arm connection point of a bridge arm of any phase in the second group of bridge arms, the bridge arm in the second group of bridge arms connected to the regulating switching module is a target bridge arm, and the power module controls the first and second energy storage elements to form a second battery charge / discharge circuit and perform charging and discharging during a first period. The control includes: turning on an upper bridge arm of any phase in the first group of bridge arms and turning on the lower bridge arm of the target bridge arm in the second group of bridge arms; controlling the lower bridge arm of the target bridge arm to be turned off during the second period and turning on an upper bridge arm of at least one phase of the bridge arms other than the target bridge arm in the second group of bridge arms; and controlling the upper bridge arm of the first group of bridge arms to be turned off and the lower bridge arm corresponding to the turned-off bridge arm to be turned on during the third period. Here, the control of the first period, the second period and the third period are performed alternately and continuously.

[0040] The charge / discharge control method according to the embodiment of this application specifically controls the on / off switching of different bridge arm groups of the first and second switching modules when adjusting the charge / discharge between the power module and the first and second energy storage elements, thereby achieving alternating charge / discharge between the power module and the first and second energy storage elements, and achieving self-heating of the power module. During the self-heating process of the power module, continuous self-heating is achieved by alternating control of the first, second, and third periods.

[0041] In some embodiments, the first switching module includes a first group of bridge arms, the second switching module includes a second group of bridge arms, the first energy storage element includes a motor winding, the regulating switching module is connected to the neutral point of the motor winding and to the upper and lower bridge arm connection point of any phase bridge arm of the second group of bridge arms, the bridge arm of the second group of bridge arms connected to the regulating switching module is a target bridge arm, and the power module controls the first and second energy storage elements to form a second battery charge / discharge circuit and perform charging and discharging, in the first period, The control includes: turning on a lower bridge arm of any phase in the first group of bridge arms and turning on the upper bridge arm of the target bridge arm of the second group of bridge arms; controlling the upper bridge arm of the target bridge arm to be turned off during the second period and turning on a lower bridge arm of at least one phase of the bridge arms other than the target bridge arm in the second group of bridge arms; and controlling the turned-on lower bridge arm of the first group of bridge arms to be turned off and turning on the upper bridge arm corresponding to the turned-off bridge arm during the third period. Here, the control of the first period, the second period and the third period are performed alternately and continuously.

[0042] The charge / discharge control method according to the embodiment of this application specifically controls the on / off switching of different bridge arm groups of the first and second switching modules when adjusting the charge / discharge between the power module and the first and second energy storage elements, thereby achieving alternating charge / discharge between the power module and the first and second energy storage elements, and achieving self-heating of the power module. During the self-heating process of the power module, continuous self-heating is achieved by alternating control of the first, second, and third periods.

[0043] According to a fourth aspect, the present application provides a computing device comprising a memory for storing executable instructions and a processor connected to the memory for completing the charge-discharge control method described in any one of the third aspects by executing the executable instructions.

[0044] The power module computing device according to the embodiment of this application connects a first energy storage element in one set of motors to a second switching module in another set of motors using a regulating switching module, thereby enabling self-heating of the battery in a dual-drive motor scenario. By adjusting the switching modules in the two sets of motors, the charging and discharging of the power module can be flexibly adjusted, and the self-heating method of the power battery can be flexibly adjusted to suit the heating demands of various scenarios, thereby reducing costs. At the same time, the charging and discharging of the dual-drive motors can be flexibly adjusted to provide a means for self-heating the battery, thereby meeting the heating demands in various scenarios.

[0045] According to the fifth aspect, the present application provides a computer-readable storage medium in which a computer program is stored, the computer program being executed by a processor to realize any one of the charge / discharge control methods of the third aspect.

[0046] The computer-readable storage medium according to the embodiment of this application connects a first energy storage element in one set of motors to a second switching module in another set of motors using an adjustable switching module, thereby enabling self-heating of the batteries of the dual motors in a dual-drive motor scenario. By adjusting the switching modules in the two sets of motors, the charging and discharging of the power modules can be flexibly adjusted, and the self-heating method of the power batteries can be flexibly adjusted to suit the heating demands of various scenarios, thereby reducing costs. At the same time, the charging and discharging of the dual-drive motors can be flexibly adjusted to provide a means for self-heating the batteries, thereby meeting the heating demands in various scenarios.

[0047] To more clearly explain the technical concept of the embodiments of this application, the following is a brief introduction to the drawings that may be used in the embodiments of this application. It is obvious that the drawings in the following description represent only a few embodiments of this application, and those skilled in the art can obtain other drawings based on these, without requiring any creative effort. In the drawings, the drawings are not drawn to actual scale. [Brief explanation of the drawing]

[0048] [Figure 1] This is a schematic diagram of a modularized charge / discharge circuit according to one or more embodiments. [Figure 2] This is a schematic circuit diagram of a charge / discharge circuit 100 according to one or more embodiments. [Figure 3] This is a schematic diagram of the structure of a power consumption device 200 according to one or more embodiments. [Figure 4] This is a schematic diagram of the steps of a charge / discharge control method according to one or more embodiments. [Figure 5] This is a schematic diagram of the discharge of a battery that is charged and discharged between a power module and a first energy storage element in a charge-discharge control method according to one or more embodiments. [Figure 6] This is a schematic diagram of a motor freewheel that charges and discharges between a power module and a first energy storage element in a charge / discharge control method according to one or more embodiments. [Figure 7] This is a schematic diagram of battery charging between a power module and a first energy storage element in a charge / discharge control method according to one or more embodiments. [Figure 8] This is a schematic diagram of the discharge of a battery in Case 1, which charges and discharges between a power module and a first energy storage element and a second energy storage element in a charge-discharge control method according to one or more embodiments. [Figure 9] This is a schematic diagram of a motor freewheel in case 1, which charges and discharges between a power module and a first energy storage element and a second energy storage element in a charge / discharge control method according to one or more embodiments. [Figure 10]This is a schematic diagram of the charging of a battery in Case 1, which charges and discharges between a power module and a first energy storage element and a second energy storage element in a charge / discharge control method according to one or more embodiments. [Figure 11] This is a schematic diagram of the discharge of a battery in case 2, which charges and discharges between a power module and a first energy storage element and a second energy storage element in a charge-discharge control method according to one or more embodiments. [Figure 12] This is a schematic diagram of a motor freewheel in case 2 that charges and discharges between a power module and a first energy storage element and a second energy storage element in a charge / discharge control method according to one or more embodiments. [Figure 13] This is a schematic diagram of the charging of a battery in case 2, which charges and discharges between a power module and a first energy storage element and a second energy storage element in a charge / discharge control method according to one or more embodiments. [Figure 14] This is a schematic diagram of the structure of another computing device according to one or more embodiments. [Modes for carrying out the invention]

[0049] The embodiments of this application will be described in more detail below, linking them with the drawings and examples. The detailed descriptions of the embodiments and drawings below are for illustrative purposes to illustrate the principles of this application, but are not intended to limit the scope of this application; in other words, this application is not limited to the embodiments described.

[0050] In the description of this application, unless otherwise specified, the meaning of "multiple" is two or more. The directions or positional relationships indicated by terms such as "up," "down," "left," "right," "inside," and "outside" are merely for the convenience and simplification of the description in this application and do not indicate or imply that the mentioned devices or elements have a specific direction or must be configured and operated in a specific direction, and should not be understood as limitations on this application. Furthermore, terms such as "first," "second," and "third" are used solely for descriptive purposes and should not be understood as indicating or implying relative importance. "Perpendicular" does not mean perpendicular in the strict sense, but is within the tolerance range. "Parallel" does not mean parallel in the strict sense, but is within the tolerance range.

[0051] The directional terms used in the following description all refer to the directions illustrated and do not limit the specific structure of this application. Furthermore, unless explicitly defined or limited, the terms “attachment,” “connection,” and “connection” in this application should be understood in a broad sense, and may refer to physical connections, electrical connections, integral connections, or indirect connections through an intermediate medium. Those skilled in the art will be able to understand the specific meaning of these terms in this application depending on the specific circumstances.

[0052] In particular, regarding battery self-heating, various aspects of power module performance are constantly improving with the advancement of battery technology. However, the currently used battery self-heating method and application scenario are limited. How to flexibly adjust the charging and discharging of power modules and the battery self-heating method in various scenarios is an urgent issue that needs to be resolved.

[0053] Furthermore, regarding the self-heating method of the battery in dual-drive motor usage scenarios, common heating methods are single-unit and costly. Moreover, the impedance parameters during the battery heating process cannot be adjusted, leading to problems such as relatively large spike currents during the battery heating process in high-voltage level systems. Furthermore, the heating current cannot be further adjusted and increased, making it impossible to improve the heating speed. These problems are prominent in the market and degrade the customer experience.

[0054] In view of this, embodiments of the present application provide a charge / discharge circuit, method, computing device and control device thereof, which draw the neutral point of one set of motors and connect it to a controller of another set of motors, i.e., a bridge arm of any phase of the switching module, via a switch connector, i.e., a regulating switching module in this application. Self-heating of the battery is achieved by utilizing the alternating current generated by the charge / discharge circuit between the drive motor and the battery, and the present application allows for flexible adjustment of the charge / discharge circuit between the power battery and the energy storage element without changing the motor structure, and the present application achieves battery heating based on dual-drive motor scenarios in particular, reduces costs, and provides a means for self-heating the battery by flexibly adjusting the charge / discharge of the dual-drive motor, thereby meeting heating demands in various scenarios.

[0055] Specifically, the first and second heating modules in the embodiments of this application may correspond to two sets of drive motors, and the maximum current for battery heating is achieved by controlling the on / off state of the bridge arms of different phases of the motor switching modules, that is, by controlling and adjusting the magnitude of the impedance required for heating. Drawing out a single motor neutral point not only reduces the heating change point of the dual motors but also enables the adjustment of the heating impedance parameter, improving the system compatibility of the motors and improving the heating speed of the battery.

[0056] The power module in the embodiments of this application may include, but is not limited to, lithium-ion batteries, lithium metal batteries, lead-acid batteries, nickel-cadmium batteries, nickel-metal hydride batteries, lithium-sulfur batteries, lithium-air batteries, or sodium-ion batteries. In terms of scale, the battery in the embodiments of this application may be a single cell, a battery module, or a battery pack. In terms of application scenarios, the battery can be used in power systems of automobiles, steamships, and the like. For example, it can be used as a power source in an electric vehicle to supply power to the electric vehicle's motor. The battery can also supply electrical energy to other electrical components of an electric vehicle, such as an in-car air conditioner or an in-car player.

[0057] To facilitate the explanation, the application of power modules to new energy vehicles (electric vehicles) will be described below as an example.

[0058] The drive motor and its control system are core components of new energy vehicles, and their driving characteristics determine the main performance indicators of the vehicle's operation. The motor drive system of a new energy vehicle mainly consists of parts such as an electric motor, a power converter, a motor controller (e.g., an inverter), various types of detection sensors, and a power supply. The motor is a rotating electromagnetic machine that operates using the principle of electromagnetic induction and is used to convert electrical energy into mechanical energy. During operation, it absorbs power from the electrical system and outputs mechanical power to the mechanical system.

[0059] Selectively, power-consuming devices and computing equipment include, but are not limited to, vehicles, ships, or spacecraft.

[0060] Generally, battery heating control policies cannot adjust impedance parameters during the battery heating process, leading to problems such as relatively large spike currents in high-voltage systems. Furthermore, they cannot further adjust and increase the heating current, thus failing to improve the heating speed and making them inflexible to meet heating demands in various scenarios. These problems are prominent in the market and degrade the customer experience. Therefore, compared to existing solutions, this application provides a charge / discharge circuit, method, computing device, and control device thereof, which can control and adjust the magnitude of the impedance required for heating by controlling the on / off state of different phase bridge arms of a switching module, thereby achieving the maximum current for battery heating. Drawing a single motor neutral point not only reduces the heating change point of dual motors but also enables the adjustmentability of heating impedance parameters, improving the system compatibility of the motor and increasing the battery heating speed.

[0061] In principle, some embodiments of this application utilize a dual electric drive system to store energy during the discharge process of a battery by drawing out one set of motor neutral wires and connecting them to another set of motor controllers, i.e., switching modules, thereby controlling the ON timing of the switching transistors of the bridge arm groups in the two motor controllers, and generating oscillating currents across the battery busbars, thereby generating heat in the battery. The magnitude of the oscillating current generated in the battery busbars can be adjusted by combining the impedances of the two motors, i.e., by combining the bridge arms of either phase in the switching modules of the two motors to participate in the charge / discharge circuit, determining different heating modes at different voltage plateaus, and adjusting the impedances of the two motors, i.e., by combining the bridge arms of either phase in the switching modules of the two motors, reduces the spike current of the electric drive system and increases the oscillating current generated on both sides of the battery.

[0062] The charge / discharge circuits, methods, computing devices, and control devices of some embodiments of this application can further realize a battery self-heating technology that allows for adjustment of the battery temperature rise rate at a relatively low cost by redundantly integrating a second set of motor drive systems based on a single-motor heating control method.

[0063] The following provides an overall description of the charge / discharge circuit and its charge / discharge principle in this application, thereby allowing for a better understanding of the charge / discharge method for the dual-drive motor in this application.

[0064] A neutral wire is drawn from one set of motor windings, and the neutral wire is connected to one set of bridge arms in another set of motor controllers. The magnitude and phase difference of the current flowing through the neutral wire winding are controlled to match. Unlike the driving mode, where a symmetrical AC current is required to be passed through the motor windings to generate a rotating magnetic field and drive the motor, this application also allows for the control of current to be passed through one phase winding of the neutral wire motor in order to form a first battery charge / discharge circuit or a second battery charge / discharge circuit. When controlling current to be passed through two or three phase windings of the neutral wire motor, the magnitude and phase difference of the current that needs to flow into each phase winding must all match, so that the motor does not generate torque.

[0065] The motor neutral wire is routed to another set of electric drive systems, forming a circuit with the battery terminals. Here, depending on the resistance requirements, the neutral wire current can be controlled to not flow through the second motor windings and instead return to the battery only from the second motor controller. If the spikes flowing through the motor controller switch are too large, the second motor controller can be controlled to introduce either two-phase or three-phase windings of the second motor to adjust the system's heating impedance and reduce the spike current.

[0066] The method for generating vibration heating current at the battery busbar is mainly as follows: During the battery discharge phase, either the upper or lower bridge arm of any phase of the first set of motors is turned on, and the relay connected to the motor neutral wire maintains the ON state for the second set of motors, and either the lower or upper bridge arm of any phase of the second set of motors is turned on, at which point the battery discharges both sets of motor systems. During the motor freewheeling phase, the turned-on lower bridge arm in the second set of motor controllers is turned off, and the freewheeling diode of the upper bridge arm enables internal freewheeling of both sets of motors, or all lower bridge arms of the second set of motor controllers are turned off, and at the same time the upper bridge arm of the current phase bridge arm is turned on, enabling internal freewheeling of both sets of motors and improving the stability of the motor voltage. During the battery charging phase, either the lower or upper bridge arm of any phase of the first set of motors is turned on, enabling the motors to recharge the battery.

[0067] Finally, by introducing the motor neutral wire to the second motor controller, we were able to adjust the heating current according to system demand, reduce busbar spike current, and improve heating efficiency.

[0068] To further clarify the technical concepts and advantages of the embodiments of this application, exemplary embodiments of this application are described in more detail below, accompanied by drawings. It should be noted that the embodiments described are only a selection of embodiments of this application and do not exhaustively represent all embodiments. It should be noted that, where there are no conflicts, the embodiments and features of the embodiments in this application are combinable with each other.

[0069] For the sake of understanding and description, in the functional principle, the first heating module and the second heating module in the embodiment of this application may correspond to two sets of drive motors, the first energy storage element and the second energy storage element may correspond to their respective motor windings, and the first switching module and the second switching module may correspond to their respective motor controllers.

[0070] Figure 1 is a schematic diagram of the modularized charge / discharge circuit according to an embodiment of this application. Figure 2 is a schematic circuit diagram of the charge / discharge circuit 100 according to an embodiment of this application.

[0071] As shown in Figure 1, the charge / discharge circuit according to this application includes a power module 10, a first heating module 20, a second heating module 30, and a control switching module, wherein both the first heating module 20 and the second heating module 30 are connected to the power module 10, the first heating module 20 includes a first energy storage element 202 and a first switching module 201, the second heating module 30 includes a second energy storage element 302 and a second switching module 301, both the first switching module 201 and the second switching module 301 are connected to the power module 10, and the control switching module is connected between the first energy storage element 202 and the second switching module 301.

[0072] In the charge / discharge circuit according to the embodiment of this application, the first heating module 20 and the second heating module 30 may correspond to two sets of drive motors, and the first energy storage element 202 in one set of motors is connected to the second switching module 301 in the other set of motors by an adjustment switching module. In the dual-drive motor scenario, the charge / discharge circuit between the power battery and the energy storage element is flexibly adjusted to realize self-heating of the battery of the dual motors. By adjusting the first switching module 201 and the second switching module 301 in the two sets of motors, the charge / discharge of the power module 10 is flexibly adjusted, and the self-heating method of the power battery is flexibly adjusted to suit the heating demands of various scenarios, thereby reducing costs. At the same time, the charge / discharge of the dual-drive motor is flexibly adjusted to provide a means for self-heating the battery, thereby meeting the heating demands of various scenarios.

[0073] In some embodiments, the first energy storage element 202 includes a motor winding, and a regulating switching module is connected between the neutral point of the motor winding and a second switching module 301.

[0074] The charge / discharge circuit according to the embodiment of this application is connected to the second switching module 301 of another set of motors via the neutral point of the motor winding of the first energy storage element 202 during the charge / discharge heating process, thereby achieving self-heating of the battery of the dual motor in a dual-drive motor scenario. By adjusting the switching modules in the two sets of motors, the charge / discharge impedance of the power module 10 can be flexibly adjusted, further adjusting the spike current of the charge / discharge circuit and further improving the heating speed. The self-heating method of the power battery can be flexibly adjusted to suit the heating demands of various scenarios, reducing costs, and at the same time, the charge / discharge of the dual-drive motor can be flexibly adjusted to provide a means for self-heating the battery, thereby meeting the heating demands in various scenarios.

[0075] In some embodiments, the second switching module 301 includes a group of bridge arms, and the regulating switching module is connected between the first energy storage element 202 and the upper and lower bridge arms of any phase of the bridge arm group.

[0076] In the charge / discharge circuit according to the embodiment of this application, the first switching module 201 and the second switching module 301 correspond to the motor controllers of the two sets of motors. During the charge / discharge heating process, the neutral point of the motor winding of the first energy storage element 202 is connected to one of the phase bridge arms of the bridge arm group of the second switching module 301. Energy storage and energy supply are performed during the charge / discharge process by any one phase bridge arm of the first switching module 201 and the second switching module 301, improving the charge / discharge efficiency between the power modules 10 and realizing self-heating of the power modules 10. By controlling the on / off state of the bridge arms of different phases of the switching modules, the magnitude of the impedance required for heating can be controlled and adjusted, and the maximum current for battery heating can be achieved. By drawing only one motor neutral point, the heating change point of the dual motor is reduced, and the adjustability of the heating impedance parameter is realized, improving the system compatibility of the motor and improving the heating speed of the battery.

[0077] As shown in Figure 2, the regulating switching module K6 is connected to the first energy storage element 202 and the second switching module 301. The regulating switching module is used to turn on the first heating module 20 and the second heating module 30 in response to a battery heating signal. The first switching module 201 and the second switching module 301 are used to regulate the charging and discharging between the power module 10 and the first energy storage element 202 and the second energy storage element 302 in response to a heating regulation signal.

[0078] As shown in Figure 2, the first energy storage element 202 includes an M-phase motor, the first switching module 201 includes a first group of bridge arms, the second switching module 301 includes a second group of bridge arms, and the first and second groups of bridge arms include an M-phase bridge arm, where M is a positive integer, and the M-phase windings of the M-phase motor are connected in a one-to-one correspondence with the upper and lower bridge arm connection points of each phase bridge arm in the M-phase bridge arm.

[0079] All connection points of the upper bridge arms in the first switching module 201 are connected to the first positive side of the power module 10 as the first end, all connection points of the lower bridge arms in the first switching module 201 are connected to the first negative side of the power module 10 as the second end, and all connection points of the upper and lower bridge arms in the first switching module 201 are connected to the first energy storage element 202, that is, to one end of all motor windings. The neutral point of the first energy storage element 202 is connected to one end of the regulating switching module.

[0080] All upper bridge arm connection points in the second switching module 301 are connected to the second positive terminal side of the power module 10 as first ends, all lower bridge arm connection points in the second switching module 301 are connected to the second negative terminal side of the power module 10 as second ends, and all upper and lower bridge arm connection points in the second switching module 301 are connected to the second energy storage element 302, respectively. Furthermore, the upper and lower bridge arm connection points of any phase bridge arm in the second switching module 301 are connected to the other end of the regulating switching module, and the bridge arm connected to the regulating switching module is the target bridge arm.

[0081] Specifically, the neutral point of the motor winding of the first energy storage element 202 is connected to one end of the regulating switching module, and the other end of the regulating switching module is connected to the upper and lower bridge arm connection point of one of the phase bridge arms of the second group of bridge arms.

[0082] Here, voltage stabilizing capacitors are connected in parallel to both ends of the first heating module 20 and the second heating module 30, providing a buffering effect against the current during the charging and discharging switching process, thereby improving the stability and sustainability of the voltage during the motor's charging and discharging process. At the same time, the voltage stabilizing capacitors can perform functions such as voltage stabilization and noise reduction.

[0083] Furthermore, for the sake of clarity, the two sets of motors in the embodiments of this application are three-phase motors, and the magnitude and phase of the current flowing through all the motor windings are equal. This ensures that the magnitude and phase of the current flowing through all the motor windings are equal, improving the control synchronization and flexibility of the bridge arm switches in the bridge arm group.

[0084] The bridge arm groups in the first switching module 201 and the second switching module 301 can be realized by an inverter in the motor drive system, where this inverter can be realized using arm switches of insulated gate bipolar power transistors (IGBTs). The number of arms in the bridge arm group is the same as the number of inductances in the motor. For example, if this motor is a three-phase motor, this inverter includes a three-phase bridge arm. Here, each phase bridge arm in this three-phase bridge arm has an upper bridge arm and a lower bridge arm, and switch units are installed on the upper and lower bridge arms, respectively. As shown in Figure 2, each upper and lower bridge arm includes a transistor and a freewheeling diode, and the transistor and freewheeling diode are connected in parallel. That is, for example, one bridge arm in the bridge arm group includes an upper bridge arm switching transistor V11 and a freewheeling diode D11, and a lower bridge arm switching transistor V14 and a freewheeling diode D14, and the other bridge arms are similar; refer to Figure 2 for details.

[0085] An M-motor may include multiple inductors, and the magnitude and phase of the current flowing through all windings of the M-phase motor are equal. Taking a three-phase motor as an example, it may include three inductors, with each inductor corresponding to one bridge arm in a group of bridge arms. Here, one end of each inductor is connected to the connection point between the upper and lower bridge arms of the bridge arm, and the other ends of each inductor are connected together, with the connection point being the three-phase neutral point of the motor.

[0086] It should be explained that this motor is not limited to a three-phase motor; it may also be a six-phase motor, and correspondingly, a six-phase motor may include a six-phase arm.

[0087] Based on this, the power module 10 may be connected in series with the inverter to supply power using the power battery charging and discharging circuit according to this application, and may be used for driving.

[0088] The circuit further includes three bridge arm groups of the inverter and a motor neutral connection wire, and the motor includes a three-phase winding, which is an essential component of an electric vehicle.

[0089] The descriptions of each embodiment above tend to highlight the differences between them, and their similarities or identical features can be referenced to one another and are therefore not described further in this specification for brevity. Figure 3 is a schematic block diagram of a power consumption device 200 according to an embodiment of this application.

[0090] As shown in Figure 3, an embodiment of the present application provides a power consumption device including a control module 40 and any one of the above charge / discharge circuits 100, wherein the control module 40 is connected to a first switching module 201, a second switching module 301, and a regulating switching module.

[0091] The power consumption device according to the embodiment of this application connects the first energy storage element 202 in one set of motors to the second switching module 301 in another set of motors by a control module and an adjustment switching module for the charge / discharge circuit, thereby enabling self-heating of the batteries of the dual motors in a dual-drive motor scenario. By adjusting the switching modules in the two sets of motors, the charging and discharging of the power module 10 can be flexibly adjusted, and the self-heating method of the power battery can be flexibly adjusted to suit the heating demands of various scenarios, thereby reducing costs. At the same time, the charging and discharging of the dual-drive motors can be flexibly adjusted to provide a means for self-heating the batteries, thereby meeting the heating demands in various scenarios.

[0092] Figure 4 is a schematic flowchart of the charge / discharge control method according to the embodiment of this application.

[0093] As shown in Figure 4, the charge / discharge control method according to the embodiment of this application is applied to power-consuming equipment and controls the regulating switching module to be turned on when the heating conditions are met (S1).

[0094] The power module is controlled to form a battery charge / discharge circuit with the first heating module and the second heating module and to perform charging and discharging (S2).

[0095] The charge / discharge control method according to the embodiment of this application controls the regulating switching module to be turned on based on a battery heating command, and in the dual-drive motor scenario, it enables self-heating of the battery of the dual motor by flexibly adjusting the charge / discharge circuit between the power battery and the energy storage element without changing the circuit structure, and flexibly adjusts the charge / discharge of the power module 10 by adjusting the first switching module 201 and the second switching module 301 in the two sets of motors, and further flexibly adjusts the self-heating method of the power battery to suit the heating demands of various scenarios, thereby reducing costs and simultaneously enabling self-heating of the battery by flexibly adjusting the charge / discharge of the dual-drive motor, thereby meeting the heating demands of various scenarios.

[0096] Here, controlling the power module to form a battery charge / discharge circuit with the first heating module and the second heating module and perform charging and discharging includes controlling the power module to form a first battery charge / discharge circuit with the first energy storage element and perform charging and discharging, or controlling the power module to form a second battery charge / discharge circuit with the first energy storage element and the second energy storage element and perform charging and discharging.

[0097] The charge / discharge control method according to the embodiment of this application determines different heating demand scenarios based on the parameters of the power module 10 to be acquired, and further controls the power module to perform charging and discharging by forming a first energy storage element and a first battery charge / discharge circuit, or controls the power module to perform charging and discharging by forming a first energy storage element, a second energy storage element and a second battery charge / discharge circuit. The most appropriate heating means is selected based on the state of the power module 10, improving the flexibility of charge / discharge adjustment and scenario adaptability. At the same time as reducing costs, the charging and discharging of the dual drive motor can be flexibly adjusted to provide self-heating for the battery, thereby meeting heating demands in various scenarios.

[0098] When this is implemented, the battery management system (BMS) collects battery pack temperature, battery state of charge (SOC), voltage, and current signals. Subsequently, the BMS analyzes one or more of the battery parameters against set thresholds to determine whether the heating conditions are met, and if so, sends a corresponding heating request to the vehicle's overall controller based on the battery SOC status.

[0099] The vehicle's overall controller reads the current operating status of the motors.

[0100] When the motor is not driven, the vehicle-wide controller sends a first control signal to the motor controller, which controls the adjustment switching module K6 at the neutral wire to turn on, connecting the two sets of motors via the neutral wire. The motor controller then sends a periodic heating drive signal to switch the motor on and off, enabling inverter control of the battery current and causing the battery to self-heat.

[0101] Specifically, the voltage plateau of the battery system is determined based on the current battery charge, the current operating state of the motor is read, including the motor's inductance, and comparative analysis reveals two types of battery states: In battery state 1, if the inductance of a set of motors, for example, the first energy storage element 202, is sufficient to meet the heating demand of the current battery system voltage plateau, a first battery charge / discharge circuit is formed and charging / discharging is performed, i.e., heating is performed using the first energy storage element 202. In battery state 2, if the inductance of a set of motors, for example, the first energy storage element 202, is insufficient to meet the heating demand of the current battery system voltage plateau, a second battery charge / discharge circuit is formed and charging / discharging is performed, i.e., heating is performed using the first energy storage element 202 and the second energy storage element 302.

[0102] Here, controlling the first switching module 201 and the second switching module 301 to adjust the power module 10 to form a second battery charge / discharge circuit with the first energy storage element 202 and the second energy storage element 302 and perform charging and discharging includes controlling the first switching module 201 and the second switching module 301 to adjust the power module 10, the first energy storage element 202 and the second energy storage element 302 to form a second battery charge / discharge circuit and perform charging and discharging.

[0103] In some embodiments, when the battery state 1 is such that the inductance of a set of motors, for example, a first energy storage element 202, is sufficient to meet the heating demand of the current battery system voltage plateau, a first battery charge / discharge circuit is formed to perform charging and discharging, and heating is performed using the first energy storage element 202.

[0104] In some embodiments, adjusting the power module to form a first battery charge / discharge circuit with the first energy storage element 202 and perform charging and discharging includes controlling a corresponding number of bridge arms in the first switching module 201 to be turned on, controlling a corresponding number of motor windings in the first energy storage element 202 to be turned on, and adjusting the power module to form a first battery charge / discharge circuit with the first energy storage element 202 and perform charging and discharging.

[0105] The charge / discharge control method according to the embodiment of this application, when heating control is performed by the inductance of a single motor, enables flexible adjustment of the charging and discharging of a dual-drive motor to perform battery self-heating by flexibly adjusting the number of inductance connections in the single motor, thereby meeting heating demands in various scenarios.

[0106] Specifically, regulating the charging and discharging between the power module 10 and the first energy storage element 202 includes controlling the power module 10 to charge the first energy storage element 202 during a first period, controlling the first energy storage element 202 to freewheel during a second period, and controlling the first energy storage element 202 to charge the power module 10 during a third period, where the control of the first, second, and third periods is performed alternately and continuously.

[0107] In the embodiment of this application, when adjusting the charging and discharging between the power module 10 and the first energy storage element 202, the power module 10 is first controlled to charge the first energy storage element 202, then the first energy storage element 202 is controlled to freewheel to buffer the current between itself and the charging and discharging circuit and stabilize the voltage of the energy storage element, and finally the first energy storage element 202 is controlled to charge the power module 10. Self-heating of the power module 10 is achieved by alternately converting the charging and discharging between the power module 10 and the first energy storage element 202. During the self-heating process of the power module 10, continuous self-heating is achieved by alternating control of a first period, a second period, and a third period.

[0108] In some embodiments, the first switching module 201 includes a first group of bridge arms, the second switching module 301 includes a second group of bridge arms, the first energy storage element 202 includes a motor winding, the regulating switching module is connected between the neutral point of the motor winding and the upper and lower bridge arm connection point of a bridge arm of any phase in the second group of bridge arms, the bridge arm in the second group of bridge arms connected to the regulating switching module is the target bridge arm, and controls the first switching module 201 and the second switching module 301 to move Adjusting the charging and discharging between the force module 10 and the first energy storage element 202 includes controlling the following during a first period: turning on an upper bridge arm of any phase in the first bridge arm group and turning on the lower bridge arm of the target bridge arm in the second bridge arm group; controlling the following during a second period: turning off the lower bridge arm of the target bridge arm; and controlling the following during a third period: turning off an upper bridge arm in the first bridge arm group that has been turned on and turning on the lower bridge arm corresponding to the bridge arm that has been turned off. Here, the control of the first, second, and third periods is performed alternately and continuously.

[0109] In this embodiment, the first energy storage element and the second energy storage element may correspond to the respective motor windings, and for the sake of ease of description, the first energy storage element and the second energy storage element may also correspond to the first motor and the second motor. The motor is an M-phase motor including an M-phase inductance winding, and the magnitude and phase of the current flowing through all the windings of the M-phase motor are equal. This embodiment uses a three-phase motor as an example and may include three inductances, where one inductance corresponds to one bridge arm of the bridge arm group of the switching module. Based on this, when performing a heating operation by connecting only one motor for battery state 1, heating can be performed by connecting 1 to 3 inductances. Figure 5 is a schematic diagram of battery charging between the power module 10 and the first energy storage element 202 in the charge / discharge control method according to the embodiment of this application. Figure 6 is a schematic diagram of a motor freewheel charging between the power module 10 and the first energy storage element 202 in the charge / discharge control method according to the embodiment of this application. Figure 7 is a schematic diagram of the discharge of a battery that is charged and discharged between the power module 10 and the first energy storage element 202 in the charge-discharge control method according to an embodiment of this application.

[0110] If the inductance of a set of motors, for example, a first energy storage element 202, is sufficient to meet the heating demand of the current battery system voltage plateau for a given battery state 1, then a first battery charge / discharge circuit is formed and heating is performed using the first energy storage element 202. A specific embodiment is described below. In the embodiments of this application, it is described as an example that all the inductance of the motor is connected to the circuit.

[0111] First, the vehicle-wide controller sends heating control signals to the first motor controller and the second controller. If it is a domain controller, the vehicle-wide controller sends heating signals to the domain controllers, and here we take two sets of independent motor controllers as an example.

[0112] As shown in Figure 5, the first switching module 201 controls the upper bridge arm of any phase to be turned on simultaneously. In this embodiment, switching transistors V11, V12, and V13 of the three-phase upper bridge arm are turned on simultaneously. The second switching module 301 controls the switching transistor V26 of the lower bridge arm of the target bridge arm to be turned on. At this time, the battery is in battery discharge mode, and the current flows from the positive terminal of the battery, through the bridge arm of the first switching module 201 and the motor winding inductance of the first energy storage element 202, and further to the bridge arm of the second switching module 301, returning to the negative terminal of the battery. As shown in Figure 5, the specific battery discharge circuit is: positive terminal of battery → first positive terminal side → V11, V12, V13 → A1, B1, C1 → V26 → second negative terminal side → negative terminal of battery.

[0113] As shown in Figure 6, since the motor is an inductive element, when the lower bridge arm V26 of the second switching module 301 is switched from the ON state to the OFF state, the winding inductance energy freewheels due to D23, and at the same time, it is possible to control the switching transistor V23 in the second switching module 301 to be turned ON. At this time, the motor is in an internal freewheeling state, the battery exchanges energy with the voltage stabilizing capacitor, and the freewheeling circuit is as shown in Figure 6, with the current flowing from the first positive side → V11, V12, V13 → A1, B1, C1 → V23 / D23 → second positive side.

[0114] As shown in Figure 7, when the frequency of the required heating current reaches the change time, the first switching module 201 controls the upper bridge arm switching transistors V11, V12, and V13 from on to off, and the winding inductance energy is freewheeled by the freewheeling diodes D14, D15, and D16. The first switching module 201 can also control the switching transistors V14, V15, and V16 to be turned on. At this time, the motor is in a battery charging state, and as shown in Figure 7, the charging circuit is: battery negative electrode → first negative electrode side → V14, V15, V16 / D14, D15, D16 → A1, B1, C1 → V23 / D23 → second positive electrode side → battery positive electrode.

[0115] Finally, the battery management system (BMS) determines whether there is an abnormality in the battery pack temperature. If there is, it sends temperature rise abnormality information to the vehicle's main controller, which then forwards the temperature rise abnormality information to the motor controller and stops heating.

[0116] The charge / discharge control method according to the embodiment of this application specifically controls the on / off switching of different bridge arm groups of the first switching module 201 and the second switching module 301 when adjusting the charge / discharge between the power module 10 and the first energy storage element 202, thereby achieving alternating charge / discharge between the power module 10 and the first energy storage element 202 and achieving self-heating of the power module 10. During the self-heating process of the power module 10, continuous self-heating is achieved by alternating control of a first period, a second period, and a third period.

[0117] To control the current generated at both ends of the battery busbar to alternate between positive and negative, the specific heating control logic may be controlled in reverse steps. The battery current enters the second set of motors from the second positive terminal, then enters the first set of motors, and finally flows out from the first negative terminal, initiating the storage of battery discharge energy. In terms of control, a switching transistor can perform inversion control in both cases.

[0118] Accordingly, in some extended embodiments, controlling the first switching module 201 and the second switching module 301 to adjust the power module 10 to form a second battery charge / discharge circuit with the first energy storage element 202 and perform charging and discharging includes, in a first period, controlling that the lower bridge arm of any phase in the first group of bridge arms is turned on and the upper bridge arm of the target bridge arm in the second group of bridge arms is turned on; in a second period, controlling that the upper bridge arm of the target bridge arm is turned off; and in a third period, controlling that the turned-on lower bridge arm in the first group of bridge arms is turned off and the upper bridge arm corresponding to the turned-off bridge arm is turned on. Here, the control of the first, second, and third periods is performed alternately and continuously. The direction of the charge / discharge current flow in this embodiment is not shown in the path diagram, but the path direction can be reversed by referring to Figures 5-7.

[0119] The charge / discharge control method according to the embodiment of this application specifically controls the on / off switching of different bridge arm groups of the first switching module 201 and the second switching module 301 when adjusting the charge / discharge between the power module 10 and the first energy storage element 202, thereby achieving alternating charge / discharge between the power module 10 and the first energy storage element 202 and achieving self-heating of the power module 10. During the self-heating process of the power module 10, continuous self-heating is achieved by alternating control of a first period, a second period, and a third period.

[0120] If, for battery state 2, the inductance of a set of motors, for example, the first energy storage element 202, is insufficient to meet the heating demand of the current battery system's voltage plateau, a second battery charge / discharge circuit is formed to perform charging and discharging, i.e., heating is performed using the first energy storage element 202 and the second energy storage element 302.

[0121] In some embodiments, controlling the first switching module 201 and the second switching module 301 to adjust the power module, the first energy storage element and the second energy storage element to form a second battery charge / discharge circuit and perform charging and discharging includes controlling a corresponding number of bridge arms in the first switching module to be turned on and a corresponding number of motor windings in the first energy storage element to be turned on, controlling a corresponding number of bridge arms in the second switching module to be turned on and a corresponding number of motor windings in the second energy storage element to be turned on and adjusting the power module, the first energy storage element and the second energy storage element to form a second battery charge / discharge circuit and perform charging and discharging.

[0122] The charge / discharge control method according to the embodiment of this application, when heating control is performed by the inductance of a dual motor, flexibly adjusts the charging and discharging of the dual drive motor by flexibly adjusting the number of inductance connections in the dual motor, thereby enabling self-heating of the battery and meeting heating demands in various scenarios.

[0123] Adjusting the power module 10, the first energy storage element 202, and the second energy storage element 302 to form a second battery charge / discharge circuit and perform charging and discharging includes, in a first period, controlling the power module 10 to charge the first energy storage element 202 and the second energy storage element 302; in a second period, controlling the first energy storage element 202 and the second energy storage element 302 to freewheel; and in a third period, controlling the first energy storage element 202 and the second energy storage element 302 to charge the power module 10, wherein the control of the first period, the second period, and the third period is performed alternately and continuously.

[0124] Therefore, when adjusting the charging and discharging between the power module 10 and the first and second energy storage elements 202 and 302, the power module 10 is first controlled to charge the first and second energy storage elements 202 and 302, then controlled to allow the first and second energy storage elements 202 and 302 to freewheel, thereby achieving current buffering between the charging and discharging circuits and stabilization of the energy storage elements' voltages, and finally controlled to allow the first and second energy storage elements 202 and 302 to charge the power module 10. By alternately converting the charging and discharging between the power module 10 and the first energy storage element 202, self-heating of the power module 10 is achieved. During the self-heating process of the power module 10, continuous self-heating is achieved by alternating control of the first, second, and third periods.

[0125] Specifically, the first switching module 201 includes a first group of bridge arms, the second switching module 301 includes a second group of bridge arms, the first energy storage element 202 includes a motor winding, the regulating switching module is connected between the neutral point of the motor winding and the upper and lower bridge arm connection point of a bridge arm of any phase in the second group of bridge arms, and the bridge arm in the second group of bridge arms connected to the regulating switching module is the target bridge arm.

[0126] Correspondingly, controlling the first switching module 201 and the second switching module 301 to adjust the power module 10, the first energy storage element 202, and the second energy storage element 302 to form a second battery charge / discharge circuit and perform charging and discharging includes, in a first period, controlling that an upper bridge arm of any phase in the first bridge arm group is turned on, and that a lower bridge arm of at least one phase of the remaining bridge arms in the second bridge arm group other than the target bridge arm is turned on; in a second period, controlling that the turned-on bridge arm in the second bridge arm group is turned off; and in a third period, controlling that the turned-on upper bridge arm in the first bridge arm group is turned off, and that the lower bridge arm corresponding to the turned-off bridge arm is turned on. Here, the control of the first period, the second period, and the third period is performed alternately and continuously.

[0127] When facing battery state 2, the number of phases of the motor windings involved in charging and discharging in the second energy storage element 302 of the second switching module 301 may be controlled more precisely, and can be mainly divided into the following two cases: For example, when the voltage of the current battery system's voltage plateau is moderate and within a certain threshold range (Case 1), the heating demand can be met if, in addition to all the motor windings of the first energy storage element 202 providing impedance, some of the motor windings of the second energy storage element 302 also need to provide impedance. Also, for example, when the voltage of the current battery system's voltage plateau is relatively high and within a certain threshold range (Case 2), the heating demand can be met if, in addition to all the motor windings of the first energy storage element 202 providing impedance, all the motor windings of the second energy storage element 302 also need to provide impedance.

[0128] In this embodiment, the first and second energy storage elements may correspond to the respective motor windings, and for the sake of simplicity, the first and second energy storage elements may also correspond to the first and second motors. The motor is an M-phase motor including an M-phase inductance winding, and the magnitude and phase of the current flowing through all the windings of the M-phase motor are equal. This embodiment uses a three-phase motor as an example and may include three inductances, where one inductance corresponds to one bridge arm of the bridge arm group of the switching module. Based on this, when performing a heating operation by connecting only one motor in battery state 1, heating can be performed by connecting 1 to 3 inductances. When performing heating operation by connecting to dual motors in battery state 2, 3 to 6 inductances may be connected. When the dual motors start operating, the two motors may each be connected to a different number of inductances, and further combination connection methods of multiple inductances may be included, for example, 1 inductance of the first motor + 2 inductances of the second motor, 1 inductance of the first motor + 3 inductances of the second motor, 2 inductances of the first motor + 2 inductances of the second motor, 2 inductances of the first motor + 3 inductances of the second motor, or 3 inductances of the first motor + 3 inductances of the second motor. This enables flexible adjustment of the charging and discharging of the dual drive motors to achieve self-heating of the battery, thereby meeting heating demands in various scenarios.

[0129] Figure 8 is a schematic diagram of the discharge of a battery that is charged and discharged between the power module 10 and the first energy storage element 202 and the second energy storage element 302 in the charge-discharge control method according to an embodiment of this application. Figure 9 is a schematic diagram of a motor freewheel that is charged and discharged between the power module 10 and the first energy storage element 202 and the second energy storage element 302 in the charge-discharge control method according to an embodiment of this application. Figure 10 is a schematic diagram of the charging of a battery that is charged and discharged between the power module 10 and the first energy storage element 202 and the second energy storage element 302 in the charge-discharge control method according to an embodiment of this application.

[0130] In Case 1, if the voltage of the current battery system's voltage plateau is moderate and within a certain threshold range, the heating demand can be met if, in addition to the impedance provided by all the motor windings of the first energy storage element 202, some of the motor windings of the second energy storage element 302 also need to provide impedance. In this case, if the inductance of the motor windings of the first energy storage element 202 is insufficient to meet the heating current demand, the two-phase inductance of the second energy storage element 302 may be connected in series with the system heating circuit.

[0131] As shown in Figure 8, first, the first switching module 201 controls the upper bridge arm of any phase to be turned on simultaneously. In this embodiment, switching transistors V11, V12, and V13 of the three-phase upper bridge arm are turned on simultaneously. The second switching module 301 controls the switching transistor V25 of the lower bridge arm of one phase other than the target bridge arm to be turned on. At this time, current flows through the two-phase windings of the second set of motors, and the battery is in discharge mode. As shown in Figure 8, the discharge circuit is: battery positive electrode → first positive electrode side → V11, V12, V13 → A1, B1, C1 → C2 → B2 → V25 → second negative electrode side → battery negative electrode.

[0132] As shown in Figure 9, since the motor is an inductive element, when the lower bridge arm V25 of the second switching module 301 is switched from the ON state to the OFF state, the winding inductance energy is freewheeled by D22, and at the same time, it is possible to control the switching transistor V22 in the second switching module 301 to be turned ON. At this time, the motor is in an internal freewheeling state, the battery exchanges energy with the voltage stabilizing capacitor, and the freewheeling circuit is as shown in Figure 9, with the current flowing from the first positive side → V11, V12, V13 → A1, B1, C1 → C2 → B2 → V22 / D22 → second positive side.

[0133] As shown in Figure 13, when the frequency of the required heating current reaches the change time, the first switching module 201 controls the upper bridge arm switching transistors V11, V12, and V13 from on to off, and the winding inductance energy is freewheeled by the freewheeling diodes D14, D15, and D16. The first switching module 201 can also control the switching transistors V14, V15, and V16 to be turned on. At this time, the motor is in a battery charging state, and as shown in Figure 10, the charging circuit is: battery negative electrode → first negative electrode side → V14, V15, V16 / D14, D15, D16 → A1, B1, C1 → C2 → B2 → V22 / D22 → second positive electrode side → battery positive electrode.

[0134] In case 2, if the voltage plateau of the current battery system is relatively high, or slightly high in the middle range, or within a certain threshold range, then the heating demand can only be met if, in addition to the impedance provided by all the motor windings of the first energy storage element 202, all the motor windings of the second energy storage element 302 also need to provide impedance.

[0135] Figure 11 is a schematic diagram of the discharge of the battery in case 2, which is charged and discharged between the power module 10 and the first energy storage element 202 and the second energy storage element 302 in the charge-discharge control method according to an embodiment of this application. Figure 12 is a schematic diagram of the motor freewheel in case 2, which is charged and discharged between the power module 10 and the first energy storage element 202 and the second energy storage element 302 in the charge-discharge control method according to an embodiment of this application. Figure 13 is a schematic diagram of the charging of the battery in case 2, which is charged and discharged between the power module 10 and the first energy storage element 202 and the second energy storage element 302 in the charge-discharge control method according to an embodiment of this application.

[0136] If the voltage plateau of the battery system is somewhat high, the inductance of the first set of motors may be insufficient to meet the heating current demand. In such cases, the three-phase inductances of the second set of motors may be combined in series and parallel before being connected in series with the heating circuit.

[0137] As shown in Figure 11, first, the first switching module 201 controls the upper bridge arm of any phase to be turned on simultaneously. In this embodiment, switching transistors V11, V12, and V13 of the three-phase upper bridge arm are turned on simultaneously. The second switching module 301 controls the switching transistors V24 and V25 of the two phase lower bridge arms other than the target bridge arm to be turned on. At this time, current flows through the three-phase windings of the second set of motors, the battery is in discharge mode, and the discharge circuit is: battery positive electrode → first positive electrode side → V11, V12, V13 → A1, B1, C1 → C2 → B2, A2 → V24, V25 → second negative electrode side → battery negative electrode.

[0138] As shown in Figure 12, since the motor is an inductive element, when the lower bridge arms V24 and V25 of the second switching module 301 are switched from the ON state to the OFF state, the winding inductance energy is freewheeled by D21 and D22, and it is possible to control the switching transistors V21 and V22 in the second switching module 301 to be turned ON. At this time, the motor is in an internal freewheeling state, the battery exchanges energy with the voltage stabilization capacitor, and the freewheeling circuit is as shown in Figure 12, where the current flows, and the first positive side → V11, V12, V13 → A1, B1, C1 → C2 → B2, A2 → V21, V22 / D21, D22 → second positive side.

[0139] As shown in Figure 13, when the frequency of the required heating current reaches the change time, the first switching module 201 controls the upper bridge arm switching transistors V11, V12, and V13 from on to off, and the winding inductance energy is freewheeled by the freewheeling diodes D14, D15, and D16. The first switching module 201 can also control the switching transistors V14, V15, and V16 to be turned on. At this time, the motor is in a battery charging state, and as shown in Figure 10, the charging circuit is: battery negative electrode → first negative electrode side → V14, V15, V16 / D14, D15, D16 → A1, B1, C1 → C2 → B2, A2 → V21, V22 / D21, D22 → second positive electrode side → battery positive electrode.

[0140] In summary, the charge / discharge control method according to the embodiment of this application specifically controls the on / off switching of different bridge arm groups of the first switching module 201 and the second switching module 301 when adjusting the charge / discharge between the power module 10 and the first energy storage element 202 and the second energy storage element 302, thereby achieving alternating charge / discharge between the power module 10 and the first energy storage element 202 and the second energy storage element 302, and achieving self-heating of the power module 10. During the self-heating process of the power module 10, continuous self-heating is achieved by alternating control of the first period, the second period and the third period.

[0141] To control the current generated at both ends of the battery busbar to alternate between positive and negative, the specific heating control logic may be controlled in reverse steps. The battery current enters the second set of motors from the second positive terminal, then enters the first set of motors, and finally flows out from the first negative terminal, initiating the storage of battery discharge energy. In terms of control, a switching transistor can perform inversion control in both cases.

[0142] Accordingly, in some extended embodiments, controlling the first switching module 201 and the second switching module 301 to adjust the power module 10, the first energy storage element 202 and the second energy storage element 302 to form a second battery charge / discharge circuit and perform charging and discharging includes, in a first period, controlling that the lower bridge arm of any phase in the first group of bridge arms is turned on and that the upper bridge arm of at least one phase of the remaining bridge arms in the second group of bridge arms (excluding the target bridge arm) is turned on; in a second period, controlling that the turned-on bridge arm in the second group of bridge arms is turned off; and in a third period, controlling that the turned-on lower bridge arm in the first group of bridge arms is turned off and that the upper bridge arm corresponding to the turned-off bridge arm is turned on. Here, the control of the first period, the second period and the third period is performed alternately and continuously. The direction of the charge and discharge current flow in this embodiment is not shown in the path diagram; the path direction can be reversed by referring to Figures 8-10 or 11-13.

[0143] The charge / discharge control method according to the embodiment of this application specifically controls the on / off switching of different bridge arm groups of the first switching module 201 and the second switching module 301 when adjusting the charge / discharge between the power module 10 and the first energy storage element 202 and the second energy storage element 302, thereby achieving alternating charge / discharge between the power module 10 and the first energy storage element 202 and the second energy storage element 302, and achieving self-heating of the power module 10. During the self-heating process of the power module 10, continuous self-heating is achieved by alternating control of a first period, a second period and a third period.

[0144] Furthermore, the battery discharge process described above can be controlled so that the lower bridge arm of any phase of the second switching module is turned on, and the motor freewheeling stage and the battery charging heating stage can be controlled so that the upper bridge arm of any phase of the second switching module is turned on. In this case, the conductive phase of the lower bridge arm during the battery discharge process does not need to correspond one-to-one with the conductive phase of the upper bridge arm during battery charging. For example, during the battery discharge stage, V25 of the second motor controller may be selected to be turned on, and during the motor freewheeling and battery charging stages, V21 of the motor controller may be controlled to be turned on, or during the battery discharge stage, V25 and V26 of the second motor controller may be selected to be turned on, and during the motor freewheeling and battery charging stages, V22 and V21 of the motor controller may be controlled to be turned on.

[0145] The descriptions of each of the above embodiments tend to emphasize the differences between them, and their similarities or identical features can be referenced to one another; for the sake of brevity, they are not described further in this specification.

[0146] In addition to the two cases described above, for battery state 2, the system can be flexibly adjusted based on the battery voltage plateau. For example, in case 3, when the battery is discharging, only the first energy storage element 202 enters the circuit, while when the freewheel and battery are charging, both the first energy storage element 202 and the second energy storage element 302 enter the circuit.

[0147] Specifically, adjusting the power module 10, the first energy storage element 202, and the second energy storage element 302 to form a second battery charge / discharge circuit and perform charging and discharging includes, in a first period, controlling the power module 10 to charge the first energy storage element 202; in a second period, controlling the first energy storage element 202 and the second energy storage element 302 to freewheel; and in a third period, controlling the first energy storage element 202 and the second energy storage element 302 to charge the power module 10, where the control of the first period, the second period, and the third period is performed alternately and continuously.

[0148] The charge / discharge control method according to the embodiment of this application, when adjusting the charge / discharge between the power module 10 and the first energy storage element 202 and the second energy storage element 302, first controls the power module 10 to charge the first energy storage element 202, then controls the first energy storage element 202 and the second energy storage element 302 to freewheel, thereby achieving current buffering between the charge / discharge circuits and stabilization of the voltage of the energy storage elements, and finally controls the first energy storage element 202 and the second energy storage element 302 to charge the power module 10, thereby achieving self-heating of the power module 10 by alternately converting the charge / discharge between the power module 10 and the first energy storage element 202. During the self-heating process of the power module 10, continuous self-heating is achieved by alternating control of the first period, the second period and the third period.

[0149] More specifically, controlling the first switching module 201 and the second switching module 301 to adjust the power module 10, the first energy storage element 202, and the second energy storage element 302 to form a second battery charge / discharge circuit and perform charging and discharging includes, in a first period, controlling the upper bridge arm of any phase in the first bridge arm group to be turned on and the lower bridge arm of the target bridge arm in the second bridge arm group to be turned on; in a second period, controlling the lower bridge arm of the target bridge arm to be turned off and the upper bridge arm of at least one phase of the bridge arms other than the target bridge arm in the second bridge arm group to be turned on; and in a third period, controlling the upper bridge arm of the first bridge arm group that has been turned on to be turned off and the lower bridge arm corresponding to the bridge arm that has been turned off to be turned on. Here, the control of the first period, the second period, and the third period is performed alternately and continuously.

[0150] As shown in Figure 5, first, the second switching module 301 controls the switching transistor V26 of the lower bridge arm of the target bridge arm to be turned on in the order of switching transistor V11, switching transistor V12, and switching transistor V13. At this time, the battery is in battery discharge mode, and the current flows from the positive terminal of the battery, through the bridge arm of the first switching module 201 and the motor winding inductance of the first energy storage element 202, and then back to the negative terminal of the battery via the bridge arm of the second switching module 301. As shown in Figure 5, the specific battery discharge circuit is: positive terminal of battery → first positive terminal side → V11, V12, V13 → A1, B1, C1 → V26 → second negative terminal side → negative terminal of battery.

[0151] As shown in Figure 9, since the motor is an inductive element, when the lower bridge arm V25 of the second switching module 301 is switched from the ON state to the OFF state, the winding inductance energy is freewheeled by D22, and at the same time, it is possible to control the switching transistor V22 in the second switching module 301 to be turned ON. At this time, the motor is in an internal freewheeling state, the battery exchanges energy with the voltage stabilizing capacitor, and the freewheeling circuit is as shown in Figure 9, with the current flowing from the first positive side → V11, V12, V13 → A1, B1, C1 → C2 → B2 → V22 / D22 → second positive side.

[0152] As shown in Figure 10, when the frequency of the required heating current reaches the change time, the first switching module 201 controls the upper bridge arm switching transistors V11, V12, and V13 from on to off, and the winding inductance energy is freewheeled by the freewheeling diodes D14, D15, and D16. The first switching module 201 can also control the switching transistors V14, V15, and V16 to be turned on. At this time, the motor is in a battery charging state, and as shown in Figure 10, the charging circuit is: battery negative electrode → first negative electrode side → V14, V15, V16 / D14, D15, D16 → A1, B1, C1 → C2 → B2 → V22 / D22 → second positive electrode side → battery positive electrode.

[0153] The charge / discharge control method according to the embodiment of this application specifically controls the on / off switching of different bridge arm groups of the first switching module 201 and the second switching module 301 when adjusting the charge / discharge between the power module 10 and the first energy storage element 202 and the second energy storage element 302, thereby achieving alternating charge / discharge between the power module 10 and the first energy storage element 202 and the second energy storage element 302, and achieving self-heating of the power module 10. During the self-heating process of the power module 10, continuous self-heating is achieved by alternating control of a first period, a second period and a third period.

[0154] To control the current generated at both ends of the battery busbar to alternate between positive and negative, the specific heating control logic may be controlled in reverse steps. The battery current enters the second set of motors from the second positive terminal, then enters the first set of motors, and finally flows out from the first negative terminal, initiating the storage of battery discharge energy. In terms of control, a switching transistor can perform inversion control in both cases.

[0155] Accordingly, in some extended embodiments, controlling the first switching module 201 and the second switching module 301 to adjust the power module 10, the first energy storage element 202, and the second energy storage element 302 to form a second battery charge / discharge circuit and perform charging and discharging includes, in a first period, controlling that the lower bridge arm of any phase in the first bridge arm group is turned on and the upper bridge arm of the target bridge arm of the second bridge arm group is turned on; in a second period, controlling that the upper bridge arm of the target bridge arm is turned off and the lower bridge arm of at least one phase of the bridge arms other than the target bridge arm in the second bridge arm group is turned on; and in a third period, controlling that the turned-on lower bridge arm of the first bridge arm group is turned off and the upper bridge arm corresponding to the turned-off bridge arm is turned on. Here, the control of the first period, the second period, and the third period is performed alternately and continuously. The direction of the charge and discharge current flow in this embodiment is not shown in the path diagram; the path direction can be reversed by referring to Figures 5-7, 8-10, or 11-13.

[0156] The charge / discharge control method according to the embodiment of this application specifically controls the on / off switching of different bridge arm groups of the first switching module 201 and the second switching module 301 when adjusting the charge / discharge between the power module 10 and the first energy storage element 202 and the second energy storage element 302, thereby achieving alternating charge / discharge between the power module 10 and the first energy storage element 202 and the second energy storage element 302, and achieving self-heating of the power module 10. During the self-heating process of the power module 10, continuous self-heating is achieved by alternating control of a first period, a second period and a third period.

[0157] The descriptions of each of the above embodiments tend to emphasize the differences between them, and their similarities or identical features can be referenced to one another; for the sake of brevity, they are not described further in this specification.

[0158] Figure 14 shows a schematic diagram of the structure of the computing device 400 according to the embodiment of this application.

[0159] As shown in Figure 14, the computing device 400 includes a memory 402 for storing executable instructions and a processor 401 connected to the memory 402 for completing the charge / discharge control method by executing the executable instructions.

[0160] As a person skilled in the art will understand, schematic diagram 14 is merely an example of a computing device 400 and is not limiting to the power module computing device 400. It may include more or fewer components than shown, or a combination of some components, or different components. For example, the power module computing device 400 may further include input / output devices, network access devices, buses, and so on.

[0161] The processor 401 (Central Processing Unit, CPU) may also be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware assemblies, etc. The general-purpose processor may be a microprocessor, or the processor 401 may be any general-purpose processor, and the processor 401 is the control center of the computing device 400, connecting all parts of the power module computing device 400 using various interfaces and circuits.

[0162] Memory 402 may be used to store computer-readable instructions, and the processor 401 realizes various functions of the power module computer 400 by operating or executing computer-readable instructions or modules stored in memory 402 and by retrieving data stored in memory 402. Memory 402 may mainly include program and data storage areas, where the program storage area can store an operating system, application programs necessary for at least one function (e.g., audio playback function, image playback function, etc.), and the data storage area can store data created based on the use of the power module computer 400. Memory 402 may also include hard disks, memory, plug-in hard disks, Smart Media Cards (SMC (Smart Media is a registered trademark)), Secure Digital (SD) cards, flash cards, at least one magnetic disk storage device, flash memory device, read-only memory (ROM), random access memory (RAM), or other non-volatile / volatile storage devices.

[0163] The modules integrated into the power module computing device 400 are implemented in the form of software function modules and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the present invention may implement all or part of the flow of the methods of the above embodiments and complete by instructing the relevant hardware with computer-readable instructions, which may be stored in a computer-readable storage medium, and when these computer-readable instructions are executed by a processor, the steps of each embodiment of the above methods can be implemented.

[0164] The computing device for the power module 10 according to the embodiment of this application controls the regulating switching module K6 to connect the first power battery 101 and the second power battery 102 in series or in parallel, and at the same time controls the switching module to regulate the charging and discharging between the power module 10 and the energy storage element 21, and further enables flexible adjustment of the charging and discharging of the power module 10 in various scenarios and flexible adjustment of the self-heating method of the battery, employing a high-frequency current heating mode when the battery temperature or battery level is lower than the set temperature, and employing a low-frequency current heating mode when the battery temperature or battery level is higher than the set temperature.

[0165] Finally, this application further provides a computer-readable storage medium in which a computer program is stored, and the computer program is executed by a processor to realize a method for controlling the charging and discharging of a power battery.

[0166] Those skilled in the art will recognize that the units and algorithmic steps of each example described in the embodiments disclosed herein can be linked together and implemented by electronic hardware, or a combination of computer software and electronic hardware. They will decide whether to perform these functions in hardware or software, depending on the specific application and design constraints of the technical proposal. Those skilled in the art may implement the described functions using different methods for each specific application, but such implementations should not be considered beyond the scope of this application.

[0167] As will be readily apparent to those skilled in the art, for the convenience and brevity of description, the specific operating processes of the systems, apparatus, and units described above can be found by referring to the corresponding processes in the embodiments of the above methods, and will not be described further here.

[0168] In the various embodiments of this application, it should be understood that the systems, apparatuses and methods presented may be implemented in other ways. For example, the embodiments of the apparatus described above are merely illustrative, and the division of the units is merely a division of logical functions. In actual implementation, there may be other methods of division, such as multiple units or groups being combined or integrated into other systems, or some features being ignored or not performed. On the other hand, the combinations, direct combinations or communication connections between the elements shown or discussed may be indirect combinations or communication connections via some interfaces, apparatuses or units, and may be electrical, mechanical, or otherwise.

[0169] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. The objective of this embodiment can be realized by selecting some or all of the units as needed in practice.

[0170] Furthermore, each functional unit in each embodiment of this application may be integrated into a single processing unit, each unit may exist physically independently, or two or more units may be integrated into a single unit.

[0171] The aforementioned functions are implemented in the form of software function units, which, when sold or used as independent products, can be stored on a computer-readable storage medium. With this understanding, the proposed techniques of this application may be embodied in the form of a software product, which may be substantially or substantially contribute to the prior art or which may be a part of this proposed technique. This computer software product is stored on a storage medium and includes some instructions for causing a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in each embodiment of this application. The storage medium includes various media capable of storing program code, such as U disks, removable hard disks, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0172] The above-mentioned embodiments are merely specific examples of the present application, and the scope of protection of this application is not limited to these. Any changes or substitutions that a person skilled in the art could easily conceive within the scope of the art described in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be the same as the scope of protection of the claims.

Claims

1. A charge / discharge circuit comprising a power module, a first heating module, a second heating module, and a control switching module, The first heating module includes a first energy storage element and a first switching module to which it is connected. The second heating module includes a second energy storage element and a second switching module to which it is connected. The first switching module and the second switching module are both connected to the power module, and the regulating switching module is connected between the first energy storage element and the second switching module in a charge / discharge circuit.

2. The charge / discharge circuit according to claim 1, wherein the first energy storage element includes a motor winding, and the regulating switching module is connected between the neutral point of the motor winding and the second switching module.

3. The charge / discharge circuit according to claim 1 or 2, wherein the second switching module includes a group of bridge arms, and the adjustment switching module is connected between the first energy storage element and the upper and lower bridge arms of any phase of the bridge arm group.

4. A power consumption device comprising a control module and a charge / discharge circuit as described in claim 1, The control module is a power-consuming device connected to the first switching module, the second switching module, and the regulating switching module.

5. A charge / discharge control method, applicable to the power consumption equipment described in claim 4, When the heating conditions are met, the control switching module is turned on. A charge / discharge control method, which includes controlling the power module to form a battery charge / discharge circuit with the first heating module and the second heating module and perform charging and discharging.

6. Controlling the power module to form a battery charge / discharge circuit with the first heating module and the second heating module and perform charging and discharging is: Controlling the power module to form the first energy storage element and the first battery charge / discharge circuit to perform charging and discharging, or The method according to claim 5, comprising controlling the power module to form a second battery charge / discharge circuit with the first energy storage element and the second energy storage element to perform charging and discharging.

7. Controlling the power module to form a battery charge / discharge circuit with the first heating module and the second heating module and perform charging and discharging is: Obtaining parameters from the power module, The method according to claim 5, further comprising determining the number of motor windings of the first energy storage element and / or the second energy storage element in the battery charge / discharge circuit based on the parameters.

8. Controlling the power module to form the first energy storage element and the first battery charge / discharge circuit and perform charging and discharging means Controlling the corresponding number of bridge arms in the first switching module to be turned on, and controlling the corresponding number of motor windings in the first energy storage element to be turned on, The method according to claim 6, further comprising adjusting the power module and the first energy storage element to form a first battery charge / discharge circuit and perform charging and discharging.

9. Controlling the power module to form the first energy storage element and the first battery charge / discharge circuit and perform charging and discharging means During the first period, the power module is controlled to charge the first energy storage element, During the second period, the first energy storage element is controlled to freewheel, The third period includes controlling the first energy storage element to charge the power module, The method according to claim 6, wherein the control of the first period, the second period, and the third period is carried out alternately and continuously.

10. The first switching module includes a first group of bridge arms, the second switching module includes a second group of bridge arms, the first energy storage element includes a motor winding, the regulating switching module is connected between the neutral point of the motor winding and the upper and lower bridge arm connection point of any phase bridge arm in the second group of bridge arms, and the bridge arm in the second group of bridge arms connected to the regulating switching module is a target bridge arm. Controlling the power module to form the first energy storage element and the first battery charge / discharge circuit and perform charging and discharging means During the first period, control is performed so that the upper bridge arm of any phase in the first group of bridge arms is turned on, and the lower bridge arm of the target bridge arm of the second group of bridge arms is turned on. During the second period, control is performed so that the lower bridge arm of the target bridge arm is turned off, In the third period, the control is performed so that the upper bridge arm among the first group of bridge arms that has been turned on is turned off, and the lower bridge arm corresponding to the bridge arm that has been turned off is turned on. The method according to claim 6, wherein the control of the first period, the second period, and the third period is carried out alternately and continuously.

11. The first switching module includes a first group of bridge arms, the second switching module includes a second group of bridge arms, the first energy storage element includes a motor winding, the regulating switching module is connected between the neutral point of the motor winding and the upper and lower bridge arm connection point of any phase bridge arm in the second group of bridge arms, and the bridge arm in the second group of bridge arms connected to the regulating switching module is a target bridge arm. Controlling the power module to form the first energy storage element and the first battery charge / discharge circuit and perform charging and discharging means During the first period, control is performed so that the lower bridge arm of any phase in the first group of bridge arms is turned on, and the upper bridge arm of the target bridge arm of the second group of bridge arms is turned on. During the second period, control is performed so that the upper bridge arm of the target bridge arm is turned off, In the third period, the control includes turning off the lower bridge arm among the first group of bridge arms that has been turned on, and turning on the upper bridge arm corresponding to the bridge arm that has been turned off. The method according to claim 6, wherein the control of the first period, the second period, and the third period is carried out alternately and continuously.

12. Controlling the power module to form a second battery charge / discharge circuit with the first energy storage element and the second energy storage element to perform charging and discharging is: Controlling the corresponding number of bridge arms in the first switching module and the corresponding number of motor windings in the first energy storage element to be turned on, and controlling the corresponding number of bridge arms in the second switching module and the corresponding number of motor windings in the second energy storage element to be turned on, The method according to claim 6, further comprising adjusting the power module, the first energy storage element, and the second energy storage element to form a second battery charge / discharge circuit and perform charging and discharging.

13. Controlling the power module to form a second battery charge / discharge circuit with the first energy storage element and the second energy storage element to perform charging and discharging is: During the first period, the power module is controlled to charge the first energy storage element and the second energy storage element, During the second period, the first energy storage element and the second energy storage element are controlled to freewheel, The third period includes controlling the power module to charge the first energy storage element and the second energy storage element, The method according to claim 6, wherein the control of the first period, the second period, and the third period is carried out alternately and continuously.

14. The first switching module includes a first group of bridge arms, the second switching module includes a second group of bridge arms, the first energy storage element includes a motor winding, the regulating switching module is connected between the neutral point of the motor winding and the upper and lower bridge arm connection point of any phase bridge arm in the second group of bridge arms, and the bridge arm in the second group of bridge arms connected to the regulating switching module is a target bridge arm. Controlling the power module to form a second battery charge / discharge circuit with the first energy storage element and the second energy storage element to perform charging and discharging means, specifically, During the first period, the upper bridge arm of any phase in the first group of bridge arms is turned on, and the lower bridge arm of one or more phases of the remaining bridge arms in the second group of bridge arms, excluding the target bridge arm, is turned on. During the second period, control is performed so that the bridge arm that was turned on among the second group of bridge arms is turned off. In the third period, the control is performed so that the upper bridge arm among the first group of bridge arms that has been turned on is turned off, and the lower bridge arm corresponding to the bridge arm that has been turned off is turned on. The method according to claim 6, wherein the control of the first period, the second period, and the third period is carried out alternately and continuously.

15. The first switching module includes a first group of bridge arms, the second switching module includes a second group of bridge arms, the first energy storage element includes a motor winding, the regulating switching module is connected to the neutral point of the motor winding and to the upper and lower bridge arm connection point of any phase bridge arm of the second group of bridge arms, and the bridge arm of the second group of bridge arms connected to the regulating switching module is a target bridge arm. Controlling the power module to form a second battery charge / discharge circuit with the first energy storage element and the second energy storage element to perform charging and discharging is: During the first period, control is performed so that the lower bridge arm of any phase in the first group of bridge arms is turned on, and the upper bridge arm of one or more phases of the remaining bridge arms in the second group of bridge arms, excluding the target bridge arm, is turned on. During the second period, control is performed so that the bridge arm that was turned on among the second group of bridge arms is turned off. In the third period, the control includes turning off the lower bridge arm among the first group of bridge arms that has been turned on, and turning on the upper bridge arm corresponding to the bridge arm that has been turned off. The method according to claim 6, wherein the control of the first period, the second period, and the third period is carried out alternately and continuously.

16. Controlling the power module to form a second battery charge / discharge circuit with the first energy storage element and the second energy storage element to perform charging and discharging is: During the first period, the power module is controlled to charge the first energy storage element, During the second period, the first energy storage element and the second energy storage element are controlled to freewheel, The third period includes controlling the power module to charge the first energy storage element and the second energy storage element, The method according to claim 6, wherein the control of the first period, the second period, and the third period is carried out alternately and continuously.

17. The first switching module includes a first group of bridge arms, the second switching module includes a second group of bridge arms, the first energy storage element includes a motor winding, the regulating switching module is connected between the neutral point of the motor winding and the upper and lower bridge arm connection point of any phase bridge arm in the second group of bridge arms, and the bridge arm in the second group of bridge arms connected to the regulating switching module is a target bridge arm. Controlling the power module to form a second battery charge / discharge circuit with the first energy storage element and the second energy storage element to perform charging and discharging is: During the first period, control is performed so that the upper bridge arm of any phase in the first group of bridge arms is turned on, and the lower bridge arm of the target bridge arm of the second group of bridge arms is turned on. During the second period, the lower bridge arm of the target bridge arm is controlled to be turned off, and one or more phase upper bridge arms of the bridge arms other than the target bridge arm in the second group of bridge arms are controlled to be turned on. In the third period, the control is performed so that the upper bridge arm among the first group of bridge arms that has been turned on is turned off, and the lower bridge arm corresponding to the bridge arm that has been turned off is turned on. The method according to claim 16, wherein the control of the first period, the second period, and the third period is carried out alternately and continuously.

18. The first switching module includes a first group of bridge arms, the second switching module includes a second group of bridge arms, the first energy storage element includes a motor winding, the regulating switching module is connected to the neutral point of the motor winding and to the upper and lower bridge arm connection point of any phase bridge arm of the second group of bridge arms, and the bridge arm of the second group of bridge arms connected to the regulating switching module is a target bridge arm. Controlling the power module to form a second battery charge / discharge circuit with the first energy storage element and the second energy storage element to perform charging and discharging is: During the first period, control is performed so that the lower bridge arm of any phase in the first group of bridge arms is turned on, and the upper bridge arm of the target bridge arm of the second group of bridge arms is turned on. During the second period, the upper bridge arm of the target bridge arm is controlled to be turned off, and one or more phase lower bridge arms of the bridge arms other than the target bridge arm in the second group of bridge arms are controlled to be turned on. In the third period, the control includes turning off the lower bridge arm among the first group of bridge arms that has been turned on, and turning on the upper bridge arm corresponding to the bridge arm that has been turned off. The method according to claim 16, wherein the control of the first period, the second period, and the third period is carried out alternately and continuously.

19. It is a computing device, Memory for storing executable instructions, A computing device comprising a processor for completing the method according to any one of claims 5 to 18 by executing instructions connected to memory and executable.

20. A computer-readable storage medium in which a computer program is stored, wherein the computer program is executed by a processor to implement the method described in any one of claims 5 to 18.

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