Charging and discharging circuit and method, and computing device and control apparatus

Abstract

Provided in the embodiments of the present application are a charging and discharging circuit and method, and a computing device and a storage medium. Two energy storage elements in the charging and discharging circuit are connected by means of a first adjustment switch module, after a switch is turned on, heating control is performed, and self-heating of a battery is realized by means of an alternating current generated by a charging and discharging loop between a dual-driving electric motor and the battery. The present application can flexibly adjust a charging and discharging loop between a traction battery and an energy storage element without changing the original structure of an electric motor, such that the cost is reduced, and the charging and discharging of a dual-driving electric motor can be flexibly adjusted so as to implement a battery self-heating scheme, thereby increasing a heating rate.

Description

Charging and discharging circuit, method, computing device and control device thereof

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 202310691523.4, filed on June 12, 2023, entitled “Charging and discharging circuit, method, computing device and control device thereof,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the field of battery technology, and in particular to a charging and discharging circuit, method, computing device, and storage medium thereof. Background Art

[0004] Due to their high energy density, rechargeable battery technology, safety, and environmental friendliness, power modules are widely used in new energy vehicles, consumer electronics, energy storage systems, and other fields. With the advancement of battery technology and the demands of different vehicles and usage scenarios, the requirements for battery self-heating performance are becoming increasingly diverse.

[0005] Among them, regarding the battery self-heating solution in the dual-drive motor usage scenario, its heating solution is single and costly. How to control battery heating in a dual-motor system, reduce the battery heating cost, and increase the heating rate of large-capacity batteries is an urgent problem to be solved.

[0006] The above statements are only used to provide background technical information related to the present application and do not necessarily constitute prior art.

[0007] Summary of the Invention

[0008] The embodiments of the present application provide a charging and discharging circuit, method, computing device and storage medium thereof, which utilize the alternating current generated by the charging and discharging circuit between the dual-drive motor and the battery to achieve battery self-heating. The present application can flexibly adjust the charging and discharging circuit between the power battery and the energy storage element without changing the original motor structure; while reducing costs, it can flexibly adjust the charging and discharging of the dual-drive motor to perform a battery self-heating scheme and improve the heating rate.

[0009] Specifically, by leading out the neutral point of the motor and controlling the heating after closing the connection through the control switch, it not only reduces the heating change point of the dual motors and the heating cost, but also improves the battery heating rate.

[0010] In the first aspect, the present application provides a charging and discharging circuit, comprising a power module, a first heating module, a second heating module and a first regulating switch module; the first heating module and the second heating module are both connected to the power module; the first heating module includes a first energy storage element; the second heating module includes a second energy storage element; the power module includes multiple battery branches; the first regulating switch module is connected between the first energy storage element and the second energy storage element.

[0011] In the charging and discharging circuit provided in the embodiment of the present application, two energy storage elements are connected through a first regulating switch module, and heating control is performed after the switch is closed. The charging and discharging circuit between the power battery and the energy storage element can be flexibly adjusted without changing the original motor structure; while reducing costs, the charging and discharging of the dual-drive motor can be flexibly adjusted to perform a battery self-heating scheme and increase the heating rate.

[0012] Among them, the first heating module and the second heating module can be equivalent to two groups of drive motors. The first energy storage element in one group of motors is connected to the second energy storage element in the other group of motors through the first adjustment switch module. In the dual-drive motor scenario, the charging and discharging circuit between the power battery and the energy storage element is flexibly adjusted to realize the self-heating of the battery of the dual motors; by adjusting the first switch module and the second switch module in the two groups of motors, the charging and discharging of the power module can be flexibly adjusted, and then the self-heating method of the power battery can be flexibly adjusted to match the heating requirements of various scenarios.

[0013] In some embodiments, the first regulating switch module is connected between a neutral point of the motor winding of the first energy storage element and a neutral point of the motor winding of the second energy storage element.

[0014] The charging and discharging circuit provided in the embodiment of the present application, by leading out the neutral point of the motor and then performing circuit heating control after closing the connection through the first regulating switch module, not only reduces the heating change point of the dual motors and reduces the heating cost, but also improves the battery heating rate; while reducing costs, the charging and discharging of the dual-drive motors can be flexibly adjusted to perform a battery self-heating solution to meet the heating needs in various scenarios.

[0015] In some embodiments, the power module includes a first battery and a second battery connected to each other; the first battery is connected to the first heating module; and the second battery is connected to the second heating module.

[0016] The charging and discharging circuit provided in the embodiment of the present application has a power module including two battery branches, a first battery and a second battery. In the dual-drive motor scenario, the charging and discharging circuits between the two batteries and the energy storage element are flexibly adjusted to achieve self-heating of the batteries of the dual motors; the charging and discharging of the power module are flexibly adjusted by adjusting the first switch module and the second switch module in the two groups of motors, and the self-heating method of the power battery is flexibly adjusted to match the heating requirements of various scenarios.

[0017] In some embodiments, the power module includes a first battery and a second battery, and the charge and discharge circuit also includes a second regulating switch module; the second regulating switch module is connected between the first battery and the second battery; the first battery is connected to the first heating module; and the second battery is connected to the second heating module.

[0018] The charging and discharging circuit provided in the embodiment of the present application has a power module including two battery branches, a first battery and a second battery, and the two batteries are connected through a second regulating switch module to perform control on the change of the connection mode of the electrically adjustable battery branches to match different charging and discharging requirements in the heating circuit, thereby improving the system adaptability of the motor and increasing the battery heating rate.

[0019] In some embodiments, the second regulating switch module is connected between the positive side of the first battery and the positive side of the second battery.

[0020] The charging and discharging circuit provided in the embodiment of the present application comprises a power module including a first battery and a second battery connected on the positive side through a second regulating switch module to form a common negative pole dual-motor heating topology circuit. On this basis, the circuit loop of the battery branch is controlled by the second regulating switch module to match different charging and discharging requirements in the heating circuit, thereby improving the system adaptability of the motor and increasing the battery heating rate.

[0021] In some embodiments, the second regulating switch module is connected between the negative electrode side of the first battery and the negative electrode side of the second battery.

[0022] The charging and discharging circuit provided in the embodiment of the present application comprises a power module including a first battery and a second battery connected on the negative pole side through a second regulating switch module to form a common negative pole dual-motor heating topology circuit. On this basis, the circuit loop of the battery branch is controlled by the second regulating switch module to match different charging and discharging requirements in the heating circuit, thereby improving the system adaptability of the motor and increasing the battery heating rate.

[0023] In some embodiments, the first heating module includes a first switch module, and the second heating module includes a second switch module; the positive side of the first battery is connected to the upper bridge arm of the first switch module, and the positive side of the second battery is connected to the upper bridge arm of the second switch module; the negative side of the first battery is connected to the negative side of the second battery, the lower bridge arm of the first switch module, and the lower bridge arm of the second switch module.

[0024] In the charging and discharging circuit provided in the embodiment of the present application, two energy storage elements are connected through a first regulating switch module, and heating control is performed after the switch is closed. The charging and discharging circuit between the power battery and the energy storage element can be flexibly adjusted without changing the original motor structure; while reducing costs, the charging and discharging of the dual-drive motor can be flexibly adjusted to perform a battery self-heating scheme and increase the heating rate.

[0025] In some embodiments, the first heating module includes a first switch module, and the second heating module includes a second switch module; the positive side of the first battery is connected to the upper bridge arm of the first switch module, and the positive side of the second battery is connected to the upper bridge arm of the second switch module; the negative side of the first battery is connected to the negative side of the second battery, the lower bridge arm of the first switch module, and the lower bridge arm of the second switch module.

[0026] In the charging and discharging circuit provided in the embodiment of the present application, two energy storage elements are connected through a first regulating switch module, and heating control is performed after the switch is closed. The charging and discharging circuit between the power battery and the energy storage element can be flexibly adjusted without changing the original motor structure; while reducing costs, the charging and discharging of the dual-drive motor can be flexibly adjusted to perform a battery self-heating scheme and increase the heating rate.

[0027] In the second aspect, the present application provides an electrical device, including a control module and a charging and discharging circuit of any one of the above; the control module is connected to the first regulating switch module, the first switch module included in the first heating module, and the second switch module included in the second heating module, and the control module is used to regulate the charging and discharging between the batteries of the power module.

[0028] The electrical equipment provided in the embodiment of the present application connects the first energy storage element in one group of motors to the second energy storage element in another group of motors through a control module and a first regulating switch module of the charging and discharging circuit, thereby realizing self-heating of the batteries of the dual motors in a dual-drive motor scenario. By adjusting the switch modules in the two groups of motors, the charging and discharging of the power modules can be flexibly adjusted, and the self-heating method of the power battery can be flexibly adjusted to match the heating requirements of various scenarios. While reducing costs, the charging and discharging of the dual-drive motors can be flexibly adjusted to perform a battery self-heating solution to meet the heating requirements in various scenarios.

[0029] In a third aspect, the present application provides a charging and discharging method, which is applied to the electrical equipment of the second aspect, including: controlling the first regulating switch module to be turned on in response to a battery heating instruction; and regulating the charging and discharging between batteries of the power module.

[0030] The charging and discharging method provided in the embodiment of the present application controls the conduction of the first regulating switch module according to the battery heating instruction. In the dual-drive motor scenario, the circuit structure is not changed and the charging and discharging circuit between the power battery and the energy storage element is flexibly adjusted to realize the self-heating of the battery of the dual motors. By adjusting the first switch module and the second switch module in the two groups of motors, the charging and discharging of the power module is flexibly adjusted. While reducing costs, the charging and discharging of the dual-drive motor can be flexibly adjusted to perform a battery self-heating scheme and improve the heating rate.

[0031] In some embodiments, the power module includes a first battery and a second battery, and the charge and discharge circuit also includes a second regulating switch module; the second regulating switch module is connected between the first battery and the second battery; regulating the charge and discharge between the batteries of the power module includes: disconnecting the second regulating switch module; regulating the charge and discharge between the first battery and the second battery.

[0032] The charging and discharging method provided in the embodiment of the present application, after disconnecting the second regulating switch module, adjusts the charging and discharging circuit between the power battery and the energy storage element to realize self-heating of the battery of the dual motor; while reducing costs, it can flexibly adjust the charging and discharging of the dual-drive motor to perform a battery self-heating scheme and improve the heating rate.

[0033] In some embodiments, the power module includes a first battery and a second battery, and regulating the charge and discharge between the batteries of the power module includes: in a first period, controlling the first battery to discharge to the second battery; in a second period, controlling the second battery to discharge to the first battery.

[0034] The charging and discharging method provided in the embodiment of the present application controls the first battery to discharge into the second battery during the first period; and controls the second battery to discharge into the first battery during the second period. This can reduce costs while flexibly adjusting the charging and discharging of the dual-drive motor to perform a battery self-heating scheme and improve the heating rate.

[0035] In some embodiments, controlling the first battery to discharge into the second battery includes: in a first period, controlling the first battery to discharge into the first energy storage element and the second energy storage element; and in a second period, controlling the first energy storage element and the second energy storage element to discharge into the second battery.

[0036] The embodiments provided herein specifically disclose controlling the discharge of a first battery into a second battery by controlling the first battery to discharge into a first energy storage element and a second energy storage element during a first period; and controlling the first energy storage element and the second energy storage element to discharge into the second battery during a second period. During the self-heating process of the power module, continuous self-heating is achieved through different control methods at different periods. This allows for flexible adjustment of the charging and discharging of the dual-drive motors to achieve a battery self-heating solution, improving the heating rate.

[0037] In some embodiments, the first heating module includes a first switch module, and the second heating module includes a second switch module; the first switch module includes a first bridge arm group, and the second switch module includes a second bridge arm group; the positive side of the first battery is connected to the upper bridge arm of the first switch module, and the positive side of the second battery is connected to the upper bridge arm of the second switch module; the negative side of the first battery is connected to the negative side of the second battery, the lower bridge arm of the first switch module and the lower bridge arm of the second switch module; controlling the first battery to discharge to the second battery includes: in the first time period, controlling the upper bridge arm of any phase in the first bridge arm group and the lower bridge arm of any phase in the second bridge arm group to be turned on; in the second time period, controlling the lower bridge arm of the second bridge arm group to be turned on, and turning on the upper bridge arm corresponding to the disconnected bridge arm.

[0038] The charge-discharge method provided in the embodiments of the present application specifically controls, during a first period of time, the upper bridge arm of any phase in the first bridge arm group and the lower bridge arm of any phase in the second bridge arm group to be conductive when regulating the discharge from the first battery to the second battery. During a second period of time, the lower bridge arm of the second bridge arm group is disconnected, and the upper bridge arm corresponding to the disconnected bridge arm is turned on. During the self-heating process of the power module, continuous self-heating is achieved through different control methods at different time periods.

[0039] In some embodiments, the first heating module includes a first switch module, and the second heating module includes a second switch module; the first switch module includes a first bridge arm group, and the second switch module includes a second bridge arm group; the positive side of the first battery is connected to the positive side of the second battery, the upper bridge arm of the first switch module, and the upper bridge arm of the second switch module; the negative side of the first battery is connected to the lower bridge arm of the first switch module, and the negative side of the second battery is connected to the lower bridge arm of the second switch module; controlling the first battery to discharge to the second battery includes: in the first time period, controlling the upper bridge arm of any phase in the second bridge arm group and the lower bridge arm of any phase in the first bridge arm group to be turned on; in the second time period, controlling the turned-on upper bridge arm in the second bridge arm group to be turned off, and turning on the lower bridge arm corresponding to the turned-off bridge arm.

[0040] The charge-discharge method provided in the embodiments of the present application specifically controls, during a first period, the upper bridge arm of any phase in the second bridge arm group and the lower bridge arm of any phase in the first bridge arm group to be conductive when regulating the discharge from the first battery to the second battery. During a second period, the conductive upper bridge arm in the second bridge arm group is controlled to be disconnected, and the lower bridge arm corresponding to the disconnected bridge arm is controlled to be conductive. During the self-heating process of the power module, continuous self-heating is achieved through different control methods at different periods.

[0041] In some embodiments, controlling the second battery to discharge into the first battery includes: in a first period, controlling the second battery to discharge into the first energy storage element and the second energy storage element; and in a second period, controlling the first energy storage element and the second energy storage element to discharge into the first battery.

[0042] The embodiments provided herein specifically disclose controlling the discharge of the second battery into the first battery by controlling the second battery to discharge into the first and second energy storage elements during a first period; and controlling the first and second energy storage elements to discharge into the first battery during a second period. During the self-heating process of the power module, continuous self-heating is achieved through different control methods at different periods. This allows for flexible adjustment of the charging and discharging of the dual-drive motors to achieve battery self-heating, improving the heating rate.

[0043] In some embodiments, the first heating module includes a first switch module, and the second heating module includes a second switch module; the first switch module includes a first bridge arm group, and the second switch module includes a second bridge arm group; the positive side of the first battery is connected to the upper bridge arm of the first switch module, and the positive side of the second battery is connected to the upper bridge arm of the second switch module; the negative side of the first battery is connected to the negative side of the second battery, the lower bridge arm of the first switch module, and the lower bridge arm of the second switch module; controlling the second battery to discharge to the first battery includes: in the first period, controlling the upper bridge arm of any phase in the second bridge arm group and the lower bridge arm of any phase in the first bridge arm group to be turned on; in the second period, controlling the turned-on lower bridge arm in the first bridge arm group to be turned off, and turning on the upper bridge arm corresponding to the disconnected bridge arm.

[0044] The charge-discharge method provided in the embodiments of the present application specifically controls, during a first period, the upper bridge arm of any phase in the second bridge arm group and the lower bridge arm of any phase in the first bridge arm group to be conductive when regulating the discharge of the second battery into the first battery. During a second period, the conductive lower bridge arm in the first bridge arm group is disconnected, and the upper bridge arm corresponding to the disconnected bridge arm is turned on. During the self-heating process of the power module, continuous self-heating is achieved through different control methods at different time periods.

[0045] In some embodiments, the first heating module includes a first switch module, and the second heating module includes a second switch module; the first switch module includes a first bridge arm group, and the second switch module includes a second bridge arm group; the positive side of the first battery is connected to the positive side of the second battery, the upper bridge arm of the first switch module, and the upper bridge arm of the second switch module; the negative side of the first battery is connected to the lower bridge arm of the first switch module, and the negative side of the second battery is connected to the lower bridge arm of the second switch module; controlling the second battery to discharge to the first battery includes: in the first period, controlling the upper bridge arm of any phase in the first bridge arm group and the lower bridge arm of any phase in the second bridge arm group to be turned on; in the second period, controlling the upper bridge arm that is turned on in the first bridge arm group to be turned off, and turning on the upper bridge arm corresponding to the disconnected bridge arm.

[0046] The charge-discharge method provided in the embodiments of the present application specifically controls, during a first period, the upper bridge arm of any phase in the first bridge arm group and the lower bridge arm of any phase in the second bridge arm group to be conductive when regulating the discharge of the second battery into the first battery. During a second period, the conductive upper bridge arm in the first bridge arm group is controlled to be disconnected, and the upper bridge arm corresponding to the disconnected bridge arm is turned on. During the self-heating process of the power module, continuous self-heating is achieved through different control methods at different periods.

[0047] In a fourth aspect, the present application provides a computing device comprising: a memory for storing executable instructions; and a processor for connecting to the memory to execute the executable instructions to complete the charging and discharging method as described in any one of the third aspects.

[0048] In the computing device provided in the embodiment of the present application, two energy storage elements are connected via a first regulating switch module, and heating control is performed after the switch is closed. This allows for flexible adjustment of the charge and discharge circuit between the power battery and the energy storage element without changing the original motor structure. While reducing costs, it allows for flexible adjustment of the charge and discharge of the dual-drive motor to implement a battery self-heating scheme, thereby increasing the heating rate.

[0049] In a fifth aspect, the present application provides a computer-readable storage medium having a computer program stored thereon; the computer program is executed by a processor to implement the charging and discharging method as described in any one of the third aspects.

[0050] The computer-readable storage medium provided in the embodiment of the present application has two energy storage elements connected via a first regulating switch module, and heating control is performed after the switch is closed. This allows for flexible adjustment of the charge and discharge circuit between the power battery and the energy storage element without changing the original motor structure. This allows for flexible adjustment of the charge and discharge of the dual-drive motor to implement a battery self-heating scheme while reducing costs, thereby increasing the heating rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without creative work.

[0052] FIG1 is a modular schematic diagram of a charge and discharge circuit according to one or more embodiments.

[0053] FIG2 is a first circuit diagram of a charge-discharge circuit according to one or more embodiments.

[0054] FIG3 is a second circuit diagram of a charge-discharge circuit according to one or more embodiments.

[0055] FIG4 is a third circuit diagram of a charge-discharge circuit according to one or more embodiments.

[0056] FIG5 is a fourth circuit diagram of a charge-discharge circuit according to one or more embodiments.

[0057] FIG6 is a schematic structural diagram of an electric device according to one or more embodiments.

[0058] FIG. 7 is a schematic diagram illustrating steps of a charging and discharging method according to one or more embodiments.

[0059] FIG8 is a schematic diagram illustrating steps for regulating charge and discharge between batteries of a power module according to one or more embodiments.

[0060] FIG9 is a schematic diagram illustrating steps of controlling the first battery to discharge into the second battery according to one or more embodiments.

[0061] FIG. 10 is a schematic diagram illustrating steps of controlling the second battery to discharge into the first battery according to one or more embodiments.

[0062] FIG11 is a first circuit schematic diagram of a first battery discharging from a second battery in a charge and discharge method according to one or more embodiments.

[0063] FIG12 is a second circuit diagram of a first battery discharging from a second battery in a charge and discharge method according to one or more embodiments.

[0064] FIG. 13 is a first circuit diagram illustrating the second battery discharging from the first battery in a charge and discharge method according to one or more embodiments.

[0065] FIG. 14 is a second circuit diagram illustrating the second battery discharging from the first battery in the charge and discharge method according to one or more embodiments.

[0066] FIG15 is a first circuit diagram illustrating discharge from a first battery to a second battery in a charge and discharge method according to one or more embodiments.

[0067] FIG. 16 is a second circuit diagram illustrating discharge from a first battery to a second battery in a charge and discharge method according to one or more embodiments.

[0068] FIG. 17 is a first circuit diagram illustrating the second battery discharging from the first battery in a charge and discharge method according to one or more embodiments.

[0069] FIG. 18 is a second circuit diagram illustrating the second battery discharging from the first battery in the charge and discharge method according to one or more embodiments.

[0070] FIG19 is a block diagram of a computing device according to one or more embodiments.

[0071] In the drawings, the drawings are not drawn to scale. DETAILED DESCRIPTION

[0072] The following detailed description of the embodiments of the present application is provided in conjunction with the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of the present application, but are not intended to limit the scope of the present application, i.e., the present application is not limited to the described embodiments.

[0073] In the description of this application, it should be noted that, unless otherwise specified, "multiple" means more than two; the terms "upper", "lower", "left", "right", "inside", "outside", etc., indicating directions or positional relationships, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on this application. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly perpendicular, but is within the allowable error range. "Parallel" is not strictly parallel, but is within the allowable error range.

[0074] The directional words that appear in the following description refer to the directions shown in the figures and do not limit the specific structure of this application. In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a physical connection, an electrical connection, or an integral connection; it can also be indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0075] With the development of battery technology, the various performance of power modules are constantly improving, especially in terms of battery self-heating. Regarding the battery self-heating solution in the dual-drive motor usage scenario, its heating solution is single and costly. How to control battery heating in a dual-motor system, reduce battery heating costs, and increase the heating rate of large-capacity batteries is an urgent problem to be solved.

[0076] Furthermore, regarding the battery self-heating solution in dual-motor scenarios, coordinated control of the dual-motor controllers is crucial. This reduces noise, vibration, and harshness (NVH) generated during battery heating, as well as rotor heating, and improves the battery heating rate. These factors are directly related to customer experience.

[0077] In view of this, the embodiments of the present application provide a charging and discharging circuit, method, computing device and storage medium thereof, which utilize the alternating current generated by the charging and discharging circuit between the dual-drive motor and the battery to achieve self-heating of the battery. The present application can flexibly adjust the charging and discharging circuit between the power battery and the energy storage element without changing the original motor structure; while reducing costs, it can flexibly adjust the charging and discharging of the dual-drive motor to perform a battery self-heating scheme and improve the heating rate.

[0078] Specifically, by leading out the neutral point of the motor and controlling the heating after closing the connection through the control switch, it not only reduces the heating change point of the dual motors and the heating cost, but also improves the battery heating rate.

[0079] Specifically, the first heating module and the second heating module in the embodiment of the present application can be equivalent to two sets of drive motors. By controlling the on and off of the different phase bridge arms of the motor switch module, the charge and discharge circuit between the power battery and the energy storage element can be flexibly adjusted without changing the original motor structure; while reducing costs, the charge and discharge of the dual-drive motor can be flexibly adjusted to perform a battery self-heating scheme to increase the heating rate. The power module in the embodiment of the present application may include but is not limited to lithium-ion batteries, lithium metal batteries, lead-acid batteries, nickel-cathode batteries, nickel-hydrogen batteries, lithium-sulfur batteries, lithium-air batteries or sodium-ion batteries. In terms of scale, the battery in the embodiment of the present application can be a single cell, or a battery module or battery pack. In terms of application scenarios, the battery can be used in power devices such as automobiles and ships. For example, it can be used in power vehicles to power the motor of the power vehicle and serve as a power source for electric vehicles. The battery can also power other electrical devices in electric vehicles, such as in-vehicle air conditioners, car players, etc.

[0080] For ease of description, the following description will be made by taking the application of the power module to a new energy vehicle (power vehicle) as an example.

[0081] The drive motor and its control system are core components of new energy vehicles. Their driving characteristics determine the vehicle's primary performance indicators. The motor drive system in new energy vehicles primarily consists of an electric motor (i.e., motor), a power converter, a motor controller (e.g., inverter), various detection sensors, and a power supply. The motor is a rotating electromagnetic machine that operates on the principle of electromagnetic induction, converting electrical energy into mechanical energy. During operation, it absorbs electrical power from the electrical system and outputs mechanical power to the mechanical system.

[0082] Optionally, the electrical device and computing equipment include but are not limited to vehicles, ships, or spacecraft.

[0083] Generally, in the prior art of battery heating control strategy, there are problems in the process of battery pulse heating, such as low battery heating rate, high rotor magnet temperature and large vibration noise. These problems are prominent in the market, reducing the customer experience. Therefore, in comparison, the present application proposes a charging and discharging circuit, method, computing device and storage medium thereof, which can flexibly adjust the charging and discharging circuit between the power battery and the energy storage element without changing the original motor structure by controlling the on and off of the different phase bridge arms of the switch module; and can flexibly adjust the charging and discharging of the dual-drive motor to perform a battery self-heating scheme while reducing costs and improving the heating rate.

[0084] In principle, the battery heating scheme of the embodiment of the present application can be based on a battery system in which multiple branches of batteries are connected in parallel to provide power. It is necessary to change the physical connection of the battery so that the dual-branch batteries are connected in reverse series during heating. Then, the charging and discharging circuit between the power battery and the energy storage element is flexibly adjusted by turning on and off the switching element to realize the mutual flow of pulse current between multiple battery packs.

[0085] The reverse series structure of batteries is to reorganize the circuit connection so that the positive electrode of one group of batteries is connected to the positive electrode of another group of batteries, or the negative electrode of one group of batteries is connected to the negative electrode of another group of batteries.

[0086] In principle, the battery heating scheme of the present embodiment is based on a system where multiple batteries independently power the motors, eliminating the need to change the inter-battery connection method. By extracting the neutral points of the dual motors to form a loop connection between the two battery packs, and controlling the heating process, using single-phase current or multi-phase current to generate in-phase current to weaken the amplitude of the composite magnetic field generated by energizing the stator coils during the motor heating process, the NVH and rotor heating issues associated with existing motor heating schemes are suppressed.

[0087] For ease of description, in the battery heating solution of the embodiment of the present application, the dual-branch battery of the power battery system includes a first battery and a second battery.

[0088] The implementation scheme of the embodiment of the present application is described as follows.

[0089] The battery system BMS (Battery Management System) collects battery pack temperature, SOC, voltage, and current signals to determine whether the battery is working properly and whether the battery meets the heating conditions; the motor controller MCU (Motor control unit) collects motor voltage and current to determine whether the motor is in a stationary state; the vehicle controller VCU (Vehicle control unit) determines whether to turn on the pulse heating device to heat the battery based on the heating request sent by the BMS and the motor working status sent by the MCU.

[0090] When the BMS sends a heating request, the VCU determines that the battery SOC status and the motor operating status meet the heating conditions;

[0091] Different control methods are used for specific dual-motor circuit topologies. Specifically, there are two types of dual-motor circuit systems: one is a dual-motor system with multiple branches of batteries connected in parallel, and the other is a dual-motor system with multiple branches of batteries supplying power to the motors independently.

[0092] For the first case where multiple branches of batteries are connected in parallel for power supply, it is necessary to first change the connection method of the battery pack, switching the battery pack from parallel mode to reverse series mode; for the second structural topology where the battery pack supplies power to two motor systems separately, there is no need to change the battery connection method.

[0093] Finally, the MCU controls the on and off of the first motor controller switch module and the second motor controller switch module to realize mutual charging and discharging between the two groups of batteries, generating heat inside the batteries.

[0094] During heating, the BMS determines whether the battery pack temperature is abnormal. If so, it sends temperature rise abnormality information to the vehicle controller. The vehicle controller forwards the temperature rise abnormality information to the MCU, the motor controller stops working, and the battery pack switches to the initial state.

[0095] During heating, the BMS determines whether the battery pack temperature has reached the required level. If so, the vehicle controller forwards a pulse heating stop message to the motor controller, stopping heating and switching the battery pack back to initial mode. Otherwise, the heating process repeats until the required temperature is reached.

[0096] The charging and discharging scheme of the embodiment of the present application improves the problem of low heating rate of the original battery, so that the temperature rise rate of the battery pack is significantly improved.

[0097] In some embodiments of the present application, the charging and discharging circuits, methods, computing devices, and storage media thereof reuse a second motor drive system to implement a battery self-heating technology with adjustable battery temperature rise rate at a lower cost.

[0098] The following describes the charging and discharging circuit and its charging and discharging principle of the present application as a whole, so as to better understand the charging and discharging scheme under the dual-drive motor of the present application.

[0099] In order to make the technical solutions and advantages of the embodiments of the present application more clearly understood, the exemplary embodiments of the present application are further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, and are not an exhaustive list of all the embodiments. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other unless they conflict.

[0100] For ease of understanding and description, in terms of functional principle, the first heating module and the second heating module of the embodiment of the present application can be equivalent to two groups of drive motors, the first energy storage element and the second energy storage element can be equivalent to their respective motor windings, and the first switch module and the second switch module can be equivalent to their respective motor controllers.

[0101] Figure 1 is a modular schematic diagram of a charge-discharge circuit provided in an embodiment of the present application. Figure 2 is a circuit schematic diagram of a charge-discharge circuit 100 provided in an embodiment of the present application.

[0102] As shown in Figure 1, the charging and discharging circuit 100 provided in the present application includes a power module 10, a first heating module 20, a second heating module 30 and a first regulating switch module; the first heating module 20 and the second heating module 30 are both connected to the power module 10; the first heating module 20 includes a first energy storage element 202; the second heating module 30 includes a second energy storage element 302; the power module 10 includes multiple battery branches; the first regulating switch module is connected between the first energy storage element 202 and the second energy storage element 302.

[0103] Based on this, in the charging and discharging circuit provided in the embodiment of the present application, two energy storage elements are connected through a first regulating switch module, and heating control is performed after the switch is closed. The charging and discharging circuit between the power battery and the energy storage element can be flexibly adjusted without changing the original motor structure; while reducing costs, the charging and discharging of the dual-drive motor can be flexibly adjusted to perform a battery self-heating scheme and increase the heating rate.

[0104] Among them, the first heating module 20 and the second heating module 30 can be equivalent to two groups of drive motors. The first adjustment switch module is used to connect the first energy storage element 202 in one group of motors to the second energy storage element 302 in the other group of motors. In the dual-drive motor scenario, the charging and discharging circuit between the power battery and the energy storage element is flexibly adjusted to realize the self-heating of the battery of the dual motors; by adjusting the first switch module 201 and the second switch module 301 in the two groups of motors, the charging and discharging of the power module 10 is flexibly adjusted, and then the self-heating method of the power battery is flexibly adjusted to match the heating requirements of various scenarios.

[0105] In some embodiments, the first regulating switch module is connected between the neutral point of the motor winding of the first energy storage element 202 and the neutral point of the motor winding of the second energy storage element 302 .

[0106] The embodiment of the present application leads out the neutral point of the motor and then performs circuit heating control after closing the connection through the first regulating switch module, which not only reduces the heating change point of the dual motors and reduces the heating cost, but also improves the battery heating rate; while reducing costs, it flexibly adjusts the charging and discharging of the dual-drive motors to perform a battery self-heating solution to meet the heating needs in various scenarios.

[0107] Figure 2 is a first circuit diagram of a charge-discharge circuit according to one or more embodiments. Figure 3 is a second circuit diagram of a charge-discharge circuit according to one or more embodiments.

[0108] As shown in Figures 2 and 3, they are charging and discharging circuits based on a power system where multiple branches of batteries independently supply power to the motor.

[0109] The power module 10 includes a first battery B1 and a second battery B2 connected to each other; the first battery B1 is connected to the first heating module 20 ; and the second battery B2 is connected to the second heating module 30 .

[0110] The charge-discharge circuit provided in the embodiments of the present application independently powers the motors connected to them, with the first battery B1 and the second battery B2 independently providing power to their respective connected motors during motor operation. The power module 10 includes two battery branches, the first battery B1 and the second battery B2. In a dual-motor drive scenario, the charge-discharge circuits between the two batteries and the energy storage element can be flexibly adjusted to achieve dual-motor battery self-heating. By adjusting the first switch module 201 and the second switch module 301 in the two motor groups, the charge and discharge of the power module 10 can be flexibly adjusted, thereby flexibly adjusting the power battery self-heating method to meet the heating requirements of various scenarios.

[0111] Figure 4 is a third circuit diagram of a charge-discharge circuit according to one or more embodiments. Figure 5 is a fourth circuit diagram of a charge-discharge circuit according to one or more embodiments.

[0112] As shown in FIG4 and FIG5, it is a charge and discharge circuit based on the power system based on multi-branch battery parallel power supply.

[0113] The power module 10 includes a first battery B1 and a second battery B2, and the charge and discharge circuit also includes a second regulating switch module; the second regulating switch module is connected between the first battery B1 and the second battery B2; the first battery B1 is connected to the first heating module 20; the second battery B2 is connected to the second heating module 30.

[0114] In the charging and discharging circuit provided in the embodiment of the present application, the power module 10 includes two battery branches, a first battery B1 and a second battery B2, and the two batteries are connected by a second regulating switch module to perform control on the change of the connection mode of the electrically adjustable battery branches to match different charging and discharging requirements in the heating circuit, thereby improving the system adaptability of the motor and increasing the battery heating rate.

[0115] As shown in FIG4 , in some embodiments, the second regulating switch module is connected between the positive electrode side of the first battery B1 and the positive electrode side of the second battery B2 .

[0116] In the charging and discharging circuit provided in the embodiment of the present application, the power module 10 includes a first battery B1 and a second battery B2 connected on the positive side through a second regulating switch module to form a common negative pole dual-motor heating topology circuit. On this basis, the circuit loop of the battery branch is controlled by the second regulating switch module to match different charging and discharging requirements in the heating circuit, thereby improving the system adaptability of the motor and increasing the battery heating rate.

[0117] As shown in FIG5 , in some embodiments, the second regulating switch module is connected between the negative electrode side of the first battery B1 and the negative electrode side of the second battery B2 .

[0118] In the charging and discharging circuit provided in the embodiment of the present application, the power module 10 includes a first battery B1 and a second battery B2 connected on the negative side through a second regulating switch module to form a common positive dual-motor heating topology circuit. On this basis, the circuit loop of the battery branch is controlled by the second regulating switch module to match different charging and discharging requirements in the heating circuit, thereby improving the system adaptability of the motor and increasing the battery heating rate.

[0119] In terms of connecting the power module 10 to the dual motors, a dual-motor heating topology based on a common battery negative pole can be implemented, as shown in Figures 2 and 4. The positive side of the first battery B1 is connected to the upper bridge arm of the first switch module 201, and the positive side of the second battery B2 is connected to the upper bridge arm of the second switch module 301; the negative side of the first battery B1 is connected to the negative side of the second battery B2, the lower bridge arm of the first switch module 201, and the lower bridge arm of the second switch module 301.

[0120] In the charging and discharging circuit provided in the embodiment of the present application, two energy storage elements are connected through a first regulating switch module, and heating control is performed after the switch is closed. The charging and discharging circuit between the power battery and the energy storage element can be flexibly adjusted without changing the original motor structure; while reducing costs, the charging and discharging of the dual-drive motor can be flexibly adjusted to perform a battery self-heating scheme and increase the heating rate.

[0121] In terms of connecting the power module 10 to the dual motors, a dual-motor heating topology based on a common battery positive pole can be implemented, as shown in Figures 3 and 5. The positive side of the first battery B1 is connected to the upper bridge arm of the first switch module 201, and the positive side of the second battery B2 is connected to the upper bridge arm of the second switch module 301; the negative side of the first battery B1 is connected to the negative side of the second battery B2, the lower bridge arm of the first switch module 201, and the lower bridge arm of the second switch module 301.

[0122] In the charging and discharging circuit provided in the embodiment of the present application, two energy storage elements are connected through a first regulating switch module, and heating control is performed after the switch is closed. The charging and discharging circuit between the power battery and the energy storage element can be flexibly adjusted without changing the original motor structure; while reducing costs, the charging and discharging of the dual-drive motor can be flexibly adjusted to perform a battery self-heating scheme and increase the heating rate.

[0123] The circuit also includes the three bridge arm groups of the inverter and the neutral connection line of the motor. The motor includes a three-phase winding and is an original component of the electric vehicle.

[0124] The above description of the various embodiments tends to emphasize the differences between the various embodiments. The same or similar aspects can be referenced with each other and will not be repeated herein for the sake of brevity.

[0125] FIG6 is a schematic structural diagram of an electric device according to one or more embodiments.

[0126] As shown in Figure 6, it includes a control module 40 and a charge and discharge circuit 100 in any of the above embodiments; the control module 40 is connected to the first regulating switch module, the first switch module 201 included in the first heating module 20, and the second switch module 301 included in the second heating module 30, and the control module is used to regulate the charge and discharge between the batteries of the power module 10.

[0127] The electrical equipment provided in the embodiment of the present application connects the first energy storage element 202 in one group of motors to the second energy storage element 302 in another group of motors through a control module and a first regulating switch module of the charging and discharging circuit, thereby realizing self-heating of the batteries of the dual motors in a dual-drive motor scenario. By adjusting the switch modules in the two groups 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 match the heating requirements of various scenarios. While reducing costs, the charging and discharging of the dual-drive motors can be flexibly adjusted to perform a battery self-heating solution to meet the heating requirements in various scenarios.

[0128] FIG. 7 is a schematic diagram illustrating steps of a charging and discharging method according to one or more embodiments.

[0129] As shown in FIG7 , the present application provides a charging and discharging method, which is applied to an electric device 200 and includes:

[0130] S1: In response to a battery heating instruction, controlling the first regulating switch module to be turned on;

[0131] S2: Regulating the charge and discharge between the batteries of the power module 10 .

[0132] The charging and discharging method provided in the embodiment of the present application controls the conduction of the first regulating switch module according to the battery heating instruction. In the dual-drive motor scenario, the circuit structure is not changed and the charging and discharging circuit between the power battery and the energy storage element is flexibly adjusted to realize the self-heating of the battery of the dual motors. By adjusting the first switch module 201 and the second switch module 301 in the two groups of motors, the charging and discharging of the power module 10 is flexibly adjusted. While reducing costs, the charging and discharging of the dual-drive motor can be flexibly adjusted to perform a battery self-heating scheme and improve the heating rate.

[0133] In some embodiments, regulating the charge and discharge between the batteries of the power module 10 in S2 includes: disconnecting the second regulating switch module; and regulating the charge and discharge between the first battery B1 and the second battery B2.

[0134] The charging and discharging method provided in the embodiment of the present application, after disconnecting the second regulating switch module, adjusts the charging and discharging circuit between the power battery and the energy storage element to realize self-heating of the battery of the dual motor; while reducing costs, it can flexibly adjust the charging and discharging of the dual-drive motor to perform a battery self-heating scheme and improve the heating rate.

[0135] FIG8 is a schematic diagram illustrating steps for regulating charge and discharge between batteries of the power module 10 according to one or more embodiments.

[0136] As shown in FIG8 , in some embodiments, the power module 10 includes a first battery B1 and a second battery B2 , and S2 regulates the charge and discharge between the batteries of the power module 10 , including:

[0137] S21: in the first period, controlling the first battery B1 to discharge to the second battery B2.

[0138] S22: in the second period, controlling the second battery B2 to discharge into the first battery B1; wherein, the control of the first period and the second period is continuously and alternately performed.

[0139] The charging and discharging method provided in the embodiment of the present application controls the first battery B1 to discharge into the second battery B2 during the first period; and controls the second battery B2 to discharge into the first battery B1 during the second period. This can reduce costs while flexibly adjusting the charging and discharging of the dual-drive motor to perform a battery self-heating scheme and improve the heating rate.

[0140] FIG. 9 is a schematic diagram illustrating steps of controlling the first battery B1 to discharge the battery B2 according to one or more embodiments.

[0141] As shown in FIG9 , in some embodiments, specifically, controlling the first battery B1 to discharge to the second battery B2 in S21 includes:

[0142] S211: During the first period, the first battery B1 is controlled to discharge to the first energy storage element 202 and the second energy storage element 302;

[0143] S212 : During the second period, the first energy storage element 202 and the second energy storage element 302 are controlled to discharge to the second battery B2 .

[0144] The embodiments provided herein specifically disclose controlling the discharge of the first battery B1 into the second battery B2. During a first period, the first battery B1 is controlled to discharge into the first energy storage element 202 and the second energy storage element 302. During a second period, the first energy storage element 202 and the second energy storage element 302 are controlled to discharge into the second battery B2. During the self-heating process of the power module 10, continuous self-heating is achieved through different control methods at different periods. This allows for flexible adjustment of the charging and discharging of the dual-drive motors to achieve a battery self-heating solution, improving the heating rate.

[0145] Applied to a topological circuit, as shown in Figures 2 and 4, based on a dual-motor heating topology with a common battery negative electrode, the first switch module 201 includes a first bridge arm group, and the second switch module 301 includes a second bridge arm group. Controlling the discharge of the first battery B1 to the second battery B2 involves: during a first period, turning on the upper bridge arm of any phase in the first bridge arm group and the lower bridge arm of any phase in the second bridge arm group; during a second period, turning off the lower bridge arm of the second bridge arm group, and turning on the upper bridge arm corresponding to the disconnected bridge arm.

[0146] Applied to a topological circuit, as shown in Figures 3 and 5, based on a dual-motor heating topology with a common battery positive electrode, the first switch module 201 includes a first bridge arm group, and the second switch module 301 includes a second bridge arm group. Controlling the discharge of the first battery B1 to the second battery B2 involves: during a first period, controlling the upper bridge arm of any phase in the second bridge arm group and the lower bridge arm of any phase in the first bridge arm group to be conductive; during a second period, controlling the conductive upper bridge arm in the second bridge arm group to be disconnected and the lower bridge arm corresponding to the disconnected bridge arm to be conductive.

[0147] FIG. 10 is a schematic diagram illustrating steps of controlling the second battery B2 to discharge into the first battery B1 according to one or more embodiments.

[0148] As shown in FIG10 , in some embodiments, controlling the second battery B2 to discharge into the first battery B1 in S22 includes:

[0149] S221 : During a first period, the second battery B2 is controlled to discharge to the first energy storage element 202 and the second energy storage element 302 .

[0150] S222 : in the second period, controlling the first energy storage element 202 and the second energy storage element 302 to discharge to the first battery B1 .

[0151] The embodiments provided herein specifically disclose controlling the discharge of the second battery B2 into the first battery B1. During a first period, the second battery B2 is controlled to discharge into the first energy storage element 202 and the second energy storage element 302. During a second period, the first energy storage element 202 and the second energy storage element 302 are controlled to discharge into the first battery B1. During the self-heating process of the power module 10, continuous self-heating is achieved through different control methods at different periods. This allows for flexible adjustment of the charging and discharging of the dual-drive motors to achieve a battery self-heating solution, improving the heating rate.

[0152] Applied to a topological circuit, as shown in Figures 2 and 4, based on a dual-motor heating topology with a common negative battery terminal, the first switch module 201 includes a first bridge arm group, and the second switch module 301 includes a second bridge arm group. Controlling the discharge of the second battery into the first battery includes: during a first period, controlling the upper bridge arm of any phase in the second bridge arm group and the lower bridge arm of any phase in the first bridge arm group to be conductive; during a second period, controlling the conductive lower bridge arm in the first bridge arm group to be disconnected and the upper bridge arm corresponding to the disconnected bridge arm to be conductive.

[0153] Applied to a topological circuit, as shown in Figures 3 and 5, this is a dual-motor heating topology based on a common-positive battery. The first switch module includes a first bridge arm group, and the second switch module includes a second bridge arm group. Controlling the discharge of the second battery into the first battery involves controlling the conduction of the upper bridge arm of any phase in the first bridge arm group and the lower bridge arm of any phase in the second bridge arm group during a first period. During a second period, the connected upper bridge arm in the first bridge arm group is disconnected, and the upper bridge arm corresponding to the disconnected bridge arm is turned on.

[0154] The following specifically uses the dual-motor heating topology structure with multiple branches of batteries connected in parallel as an example to further explain the charging and discharging principles of the present application embodiment based on the case of a common negative electrode of the battery. The dual-motor heating principle with multiple branches of batteries independently powering the motors in Figure 4 is referenced to Figure 2.

[0155] The battery system BMS (Battery Management System) collects battery pack temperature, SOC, voltage, and current signals to determine whether the battery is working properly and whether the battery meets the heating conditions; the motor controller MCU (Motor control unit) collects motor voltage and current to determine whether the motor is in a stationary state; the vehicle controller VCU (Vehicle control unit) determines whether to turn on the pulse heating device to heat the battery based on the heating request sent by the BMS and the motor working status sent by the MCU.

[0156] When the BMS sends a heating request, the VCU determines that the battery SOC status and the motor operating status meet the heating conditions;

[0157] Different control methods are used for specific dual-motor circuit topologies. Specifically, there are two types of dual-motor circuit systems: one is a dual-motor system with multiple branches of batteries connected in parallel, and the other is a dual-motor system with multiple branches of batteries supplying power to the motors independently.

[0158] For the first case of multi-branch battery power supply in parallel as shown in Figure 2, it is necessary to first change the connection method of the battery pack, switching the battery pack from parallel mode to reverse series mode; for the second structural topology as shown in Figure 4 where the battery pack separately powers two motor systems, there is no need to change the battery connection method.

[0159] As shown in Figure 2, the motor controller or BMS controls k2 to disconnect, and the batteries are switched from a parallel state to a reverse series state. At this time, the negative poles of the two battery packs are connected and the positive poles are disconnected.

[0160] Pulse heating can be divided into four stages. The first and second stages control battery B1 to charge battery B2. The third and fourth stages control battery B2 to charge battery B1.

[0161] Figure 11 is a circuit diagram 1 of a first battery discharging from a second battery in a charge-discharge method according to one or more embodiments. Figure 12 is a circuit diagram 2 of a first battery discharging from a second battery in a charge-discharge method according to one or more embodiments.

[0162] As shown in Figure 11, in the first phase, the upper arm of the first motor controller and the lower arm of the second motor controller are closed, battery B1 is discharged, and the motor inductor stores energy and boosts the voltage. At this point, the battery current flows as follows: B1 positive → V1, V2, V3 → LA1, LB1, LC1 → LA2, LB2, LC2 → V10, V11, V12 → B1 negative.

[0163] As shown in Figure 12, in the second phase, the upper bridge arm of the first motor controller and the upper bridge arm of the second motor controller are closed. The motor equivalent inductance releases the energy stored in the first phase to battery B2, causing battery B1 to discharge and battery B2 to charge. At this point, the battery current flows as follows: B1 positive → V1, V2, V3 → LA1, LB1, LC1 → LA2, LB2, LC2 → V7, ​​V8, V9 → B2 negative → B2 positive → B1 negative. To maintain the discharging state of battery B1 and the charging state of battery B2, the timing of the reciprocating switching of the upper and lower bridge arms of the second motor controller is controlled to control the timing of the battery B1 charging from battery B2.

[0164] Figure 13 is a circuit diagram 1 of the second battery discharging into the first battery in a charge and discharge method according to one or more embodiments. Figure 14 is a circuit diagram 2 of the second battery discharging into the first battery in a charge and discharge method according to one or more embodiments.

[0165] As shown in Figure 13, in the third stage, the lower bridge arm of the first motor controller is controlled and the upper bridge arm of the second motor controller is closed. The battery B2 is in a discharging state, and the motor inductor stores energy and boosts the voltage. At this time, the battery current flows as follows: B2 positive → V7, ​​V8, V9 → LA2, LB2, LC3 → LA1, LB1, LC1 → V4, V5, V6 → B2 negative.

[0166] As shown in Figure 14, in the fourth stage, the upper bridge arm of the first motor controller and the upper bridge arm V7 of the second motor controller are closed. The motor equivalent inductance releases the energy stored in the third stage to battery B1, causing battery B2 to discharge and battery B1 to charge. At this point, the battery current flows as follows: B2 positive → V7, ​​V8, V9 → LA2, LB2, LC3 → LA1, LB1, LC1 → V1, V2, V3 → B1 positive → B1 negative → B2 negative. Similar to the second stage, the timing of the reciprocating switching between the upper and lower bridge arms of the first motor controller can be controlled to control the timing of battery B2 charging battery B1.

[0167] It is optional to control the three-phase current of the motor to be of the same phase and amplitude, so that the synthetic magnetic field generated by the motor winding when the current is passed through it can be hinged to the rotor side to a minimum, thereby reducing the eddy current loss problem caused by the magnetic field change on the rotor.

[0168] The dual motors can be permanent magnet and induction motors, enabling low-temperature pulse heating. Furthermore, the first motor can be supplied with three-phase current, while the second motor operates on one of the three phases for self-heating control. This results in a single-phase inductor participating in the heating process, rather than the original three-phase inductance connected in parallel. This increases the inductance involved in energy conversion, slowing the rate of change of the heating current. Within the same voltage platform and control time, the peak value of the heating current on the motor side can be effectively reduced.

[0169] Finally, while heating, the BMS determines whether the battery pack temperature is abnormal. If so, it sends temperature rise abnormality information to the vehicle controller. The vehicle controller forwards the temperature rise abnormality information to the MCU, the motor controller stops working, and the battery pack switches to the initial state.

[0170] During heating, the BMS determines whether the battery pack temperature meets the required level. If so, the vehicle controller forwards a pulse heating stop message to the motor controller, halting heating and switching the battery pack back to initial mode. Otherwise, the heating process repeats until the required temperature is reached. The charging and discharging scheme of this embodiment improves the existing low heating rate of batteries, significantly increasing the battery pack's temperature rise rate.

[0171] Next, the charging and discharging principle of the embodiment of the present application is further explained based on the case of a common positive electrode of the battery, using the dual-motor heating topology structure with multiple branch batteries connected in parallel as an example.

[0172] The battery system BMS (Battery Management System) collects battery pack temperature, SOC, voltage, and current signals to determine whether the battery is working properly and whether the battery meets the heating conditions; the motor controller MCU (Motor control unit) collects motor voltage and current to determine whether the motor is in a stationary state; the vehicle controller VCU (Vehicle control unit) determines whether to turn on the pulse heating device to heat the battery based on the heating request sent by the BMS and the motor working status sent by the MCU.

[0173] When the BMS sends a heating request, the VCU determines whether the battery SOC and motor operating conditions meet the heating requirements. Different control methods are implemented based on the specific dual-motor circuit topology. Two dual-motor circuit systems are available: one powered by multiple batteries connected in parallel, and the other powered by multiple batteries independently.

[0174] For the first case of multi-branch battery power supply in parallel as shown in Figure 3, it is necessary to first change the connection method of the battery pack, switching the battery pack from parallel mode to reverse series mode; for the second structural topology as shown in Figure 5 where the battery pack separately powers two motor systems, there is no need to change the battery connection method.

[0175] As shown in Figure 3, the motor controller or BMS controls k2 to disconnect, and the batteries are switched from a parallel state to a reverse series state. At this time, the negative poles of the two battery packs are connected and the positive poles are disconnected.

[0176] Pulse heating can be divided into four stages. The first and second stages control battery B1 to charge battery B2. The third and fourth stages control battery B2 to charge battery B1.

[0177] Figure 15 is a first circuit diagram illustrating a first battery discharging from a second battery in a charge-discharge method according to one or more embodiments. Figure 16 is a second circuit diagram illustrating a first battery discharging from a second battery in a charge-discharge method according to one or more embodiments.

[0178] As shown in Figure 15, in the first phase, the upper arm of any phase in the second arm group and the lower arm of any phase in the first arm group are turned on. Battery B1 is discharged, and the motor inductor stores energy and boosts the voltage. At this point, the battery current flows as follows: B1 positive → V7, ​​V8, V9 → LA2, LB2, LC2 → LA1, LB1, LC1 → V4, V5, V6 → B1 negative.

[0179] As shown in Figure 16, in the second phase, the upper bridge arm in the second bridge arm group is controlled to be disconnected, and the lower bridge arm corresponding to the disconnected bridge arm is turned on. The motor equivalent inductance releases the energy stored in the first phase to battery B2, causing battery B1 to discharge and battery B2 to charge. At this time, the battery current flows as follows: B1 positive → B2 positive → B1 negative → V10, V11, V12 → LA2, LB2, LC2 → LA1, LB1, LC1 → V4, V5, V6 → B1 negative. To maintain the discharging state of battery B1 and the charging state of battery B2, the timing of the reciprocating switching of the upper and lower bridge arms of the second motor controller is controlled to control the timing of the charging of battery B1 from battery B2.

[0180] Figure 17 is a circuit diagram 1 of the second battery discharging into the first battery in a charge-discharge method according to one or more embodiments. Figure 18 is a circuit diagram 2 of the second battery discharging into the first battery in a charge-discharge method according to one or more embodiments.

[0181] As shown in Figure 17, in the third stage, the upper bridge arm of any phase in the first bridge arm group and the lower bridge arm of any phase in the second bridge arm group are controlled to be turned on, battery B2 is in a discharging state, and the motor inductor is used to store energy and boost the voltage. At this time, the battery current flows as follows: B2 positive → V1, V2, V3 → LA1, LB1, LC1 → LA2, LB2, LC3 → V10, V11, V12 → B2 negative.

[0182] As shown in Figure 18, in the fourth stage, the upper bridge arm in the first bridge arm group that is turned on is disconnected, and the upper bridge arm corresponding to the disconnected bridge arm is turned on. The motor's equivalent inductance releases the energy stored in the third stage to battery B1, causing battery B2 to discharge and battery B1 to charge. At this point, the battery current flows as follows: B2 positive → B1 positive → B1 negative → V4, V5, V6 → LA1, LB1, LC1 → LA2, LB2, LC3 → V10, V11, V12 → B2 negative. Similar to the second stage, the timing of battery B2 charging battery B1 can be controlled by controlling the switching time between the upper and lower bridge arms of the first motor controller.

[0183] It is optional to control the three-phase current of the motor to be of the same phase and amplitude, so that the synthetic magnetic field generated by the motor winding when the current is passed through it can be hinged to the rotor side to a minimum, thereby reducing the eddy current loss problem caused by the magnetic field change on the rotor.

[0184] The dual motors can be permanent magnet and induction motors, enabling low-temperature pulse heating. Furthermore, the first motor can be supplied with three-phase current, while the second motor operates on one of the three phases for self-heating control. This results in a single-phase inductor participating in the heating process, rather than the original three-phase inductance connected in parallel. This increases the inductance involved in energy conversion, slowing the rate of change of the heating current. Within the same voltage platform and control time, the peak value of the heating current on the motor side can be effectively reduced.

[0185] Finally, while heating, the BMS determines whether the battery pack temperature is abnormal. If so, it sends temperature rise abnormality information to the vehicle controller. The vehicle controller forwards the temperature rise abnormality information to the MCU, the motor controller stops working, and the battery pack switches to the initial state.

[0186] During heating, the BMS determines whether the battery pack temperature has reached the required level. If so, the vehicle controller forwards a pulse heating stop message to the motor controller, stopping heating and switching the battery pack back to initial mode. Otherwise, the heating process repeats until the required temperature is reached.

[0187] The charging and discharging scheme of the embodiment of the present application improves the problem of low heating rate of the original battery, so that the temperature rise rate of the battery pack is significantly improved.

[0188] In a fourth aspect, the present application provides a computing device comprising: a memory for storing executable instructions; and a processor for connecting to the memory to execute the executable instructions to complete the charging and discharging method as described in any one of the third aspects.

[0189] In the computing device provided in the embodiment of the present application, two energy storage elements are connected via a first regulating switch module, and heating control is performed after the switch is closed. This allows for flexible adjustment of the charge and discharge circuit between the power battery and the energy storage element without changing the original motor structure. While reducing costs, it allows for flexible adjustment of the charge and discharge of the dual-drive motor to implement a battery self-heating scheme, thereby increasing the heating rate.

[0190] In a fifth aspect, the present application provides a computer-readable storage medium having a computer program stored thereon; the computer program is executed by a processor to implement the charging and discharging method as described in any one of the third aspects.

[0191] The computer-readable storage medium provided in the embodiment of the present application has two energy storage elements connected via a first regulating switch module, and heating control is performed after the switch is closed. This allows for flexible adjustment of the charge and discharge circuit between the power battery and the energy storage element without changing the original motor structure. This allows for flexible adjustment of the charge and discharge of the dual-drive motor to implement a battery self-heating scheme while reducing costs, thereby increasing the heating rate.

[0192] The above description of the various embodiments tends to emphasize the differences between the various embodiments. The same or similar aspects can be referenced with each other and will not be repeated herein for the sake of brevity.

[0193] FIG19 shows a schematic structural diagram of a computing device 400 according to an embodiment of the present application.

[0194] As shown in FIG19 , a computing device 400 includes: a memory 402 for storing executable instructions; and a processor 401 for connecting to the memory 402 to execute the executable instructions to complete the motion vector prediction method.

[0195] Those skilled in the art will understand that schematic diagram 19 is merely an example of the computing device 400 and does not constitute a limitation on the computing device 400. The computing device 400 may include more or fewer components than shown in the figure, or a combination of certain components, or different components. For example, the computing device 400 may also include input and output devices, network access devices, buses, etc.

[0196] The processor 401 (Central Processing Unit, CPU) may also be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor, or the processor 401 may be any conventional processor. The processor 401 is the control center of the computing device 400, connecting various parts of the entire computing device 400 using various interfaces and lines.

[0197] Memory 402 can be used to store computer-readable instructions. Processor 401 implements various functions of computing device 400 by running or executing computer-readable instructions or modules stored in memory 402 and accessing data stored in memory 402. Memory 402 may primarily include a program storage area and a data storage area. The program storage area may store an operating system and at least one application required for a function (such as sound playback or image playback); the data storage area may store data created based on the use of computing device 400. Furthermore, memory 402 may include a hard disk, internal memory, a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, at least one disk storage device, a flash memory device, a read-only memory (ROM), a random access memory (RAM), or other non-volatile or volatile storage devices.

[0198] If the modules integrated into computing device 400 are implemented as software functional modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the present invention can also implement all or part of the processes in the above-mentioned method embodiments by instructing the relevant hardware through computer-readable instructions. The computer-readable instructions can be stored in a computer-readable storage medium. When executed by a processor, the computer-readable instructions can implement the steps of each of the above-mentioned method embodiments.

[0199] The power module 10 voltage regulation device provided in the embodiment of the present application controls the first regulation switch module to connect the first power battery 101 and the second power battery 102 in series or in parallel; at the same time, the switch module is controlled to regulate the charging and discharging between the power module 10 and the energy storage element 21, thereby achieving flexible adjustment of the charging and discharging of the power module 10 in various scenarios, and flexible adjustment of the battery self-heating method. When the battery temperature or the battery power is lower than the set temperature, a high-frequency current heating mode is adopted; when the battery temperature or the battery power is higher than the set temperature, a low-frequency current heating mode is adopted.

[0200] Finally, the present application also provides a computer-readable storage medium on which a computer program is stored; the computer program is executed by a processor to implement a power battery charging and discharging method.

[0201] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0202] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0203] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0204] The units described as separate components may or may not be physically separate, 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. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0205] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0206] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0207] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A charging and discharging circuit, in, It includes a power module, a first heating module, a second heating module and a first regulating switch module; the first heating module and the second heating module are both connected to the power module; The first heating module includes a first energy storage element; the second heating module includes a second energy storage element; The power module includes a plurality of battery branches; The first regulating switch module is connected between the first energy storage element and the second energy storage element.

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

3. The charge and discharge circuit according to claim 1 or 2, in, The power module includes a first battery and a second battery connected to each other; the first battery is connected to the first heating module; and the second battery is connected to the second heating module.

4. The charge and discharge circuit according to any one of claims 1 to 3, in, The power module includes a first battery and a second battery, and the charge and discharge circuit includes a second regulating switch module; the second regulating switch module is connected between the first battery and the second battery; the first battery is connected to the first heating module; and the second battery is connected to the second heating module.

5. The charge and discharge circuit according to claim 4, in, The second regulating switch module is connected between the positive electrode side of the first battery and the positive electrode side of the second battery.

6. The charge and discharge circuit according to claim 4, in, The second regulating switch module is connected between the negative electrode side of the first battery and the negative electrode side of the second battery.

7. The charge and discharge circuit according to any one of claims 1 to 5, in, The first heating module includes a first switch module, and the second heating module includes a second switch module; The positive side of the first battery is connected to the upper bridge arm of the first switch module, and the positive side of the second battery is connected to the upper bridge arm of the second switch module; the negative side of the first battery is connected to the negative side of the second battery, the lower bridge arm of the first switch module, and the lower bridge arm of the second switch module.

8. The charge and discharge circuit according to any one of claims 1 to 4 and 6, in, The first heating module includes a first switch module, and the second heating module includes a second switch module; The positive side of the first battery is connected to the positive side of the second battery, the upper bridge arm of the first switch module and the upper bridge arm of the second switch module; the negative side of the first battery is connected to the lower bridge arm of the first switch module, and the negative side of the second battery is connected to the lower bridge arm of the second switch module.

9. An electrical device, in, Comprising a control module and a charging and discharging circuit as claimed in any one of claims 1 to 8; The control module is connected to the first regulating switch module, the first switch module included in the first heating module, and the second switch module included in the second heating module. The control module is used to regulate the charging and discharging between the batteries of the power module.

10. A charge and discharge control method, in, The electrical equipment as claimed in claim 9 comprises: When the heating condition is met, controlling the first regulating switch module to be turned on; Regulate the charging and discharging between the batteries of the power module.

11. The method according to claim 10, in, The power module includes a first battery and a second battery, and the charge and discharge circuit also includes a second regulating switch module; The second regulating switch module is connected between the first battery and the second battery; the regulating the charging and discharging between the batteries of the power module includes: Disconnecting the second regulating switch module; Regulate the charge and discharge between the first battery and the second battery.

12. The method according to claim 10 or 11, in, The power module includes a first battery and a second battery, and the step of regulating the charge and discharge between the batteries of the power module includes: During a first period, controlling the first battery to discharge to the second battery; During a second period, controlling the second battery to discharge into the first battery; The control of the first time period and the second time period is continuously and alternately performed.

13. The method according to claim 12, in, The controlling the first battery to discharge to the second battery includes: Controlling the first battery to discharge to the first energy storage element and the second energy storage element; The first energy storage element and the second energy storage element are controlled to discharge to the second battery.

14. The method according to claim 12 or 13, in, The first heating module includes a first switch module, and the second heating module includes a second switch module; the first switch module includes a first bridge arm group, and the second switch module includes a second bridge arm group; the positive side of the first battery is connected to the upper bridge arm of the first switch module, and the positive side of the second battery is connected to the upper bridge arm of the second switch module; the negative side of the first battery is connected to the negative side of the second battery, the lower bridge arm of the first switch module, and the lower bridge arm of the second switch module; The controlling the first battery to discharge to the second battery comprises: Controlling the upper bridge arm of any phase in the first bridge arm group and the lower bridge arm of any phase in the second bridge arm group to be turned on; The lower bridge arm of the second bridge arm group is controlled to be turned off, and the upper bridge arm corresponding to the turned off bridge arm is turned on.

15. The method according to claim 12 or 13, in, The first heating module includes a first switch module, and the second heating module includes a second switch module; the first switch module includes a first bridge arm group, and the second switch module includes a second bridge arm group; the positive side of the first battery is connected to the positive side of the second battery, the upper bridge arm of the first switch module, and the upper bridge arm of the second switch module; the negative side of the first battery is connected to the lower bridge arm of the first switch module, and the negative side of the second battery is connected to the lower bridge arm of the second switch module; The controlling the first battery to discharge to the second battery comprises: Controlling the upper bridge arm of any phase in the second bridge arm group and the lower bridge arm of any phase in the first bridge arm group to be turned on; The turned-on upper bridge arm in the second bridge arm group is controlled to be turned off, and the lower bridge arm corresponding to the turned-off bridge arm is turned on.

16. The method according to any one of claims 12 to 15, in, The controlling the second battery to discharge into the first battery includes: Controlling the second battery to discharge to the first energy storage element and the second energy storage element; The first energy storage element and the second energy storage element are controlled to discharge to the first battery.

17. The method according to any one of claims 12 to 16, in, The first heating module includes a first switch module, and the second heating module includes a second switch module; the first switch module includes a first bridge arm group, and the second switch module includes a second bridge arm group; the positive side of the first battery is connected to the upper bridge arm of the first switch module, and the positive side of the second battery is connected to the upper bridge arm of the second switch module; the negative side of the first battery is connected to the negative side of the second battery, the lower bridge arm of the first switch module, and the lower bridge arm of the second switch module; The controlling the second battery to discharge into the first battery comprises: Controlling the upper bridge arm of any phase in the second bridge arm group and the lower bridge arm of any phase in the first bridge arm group to be turned on; The lower bridge arm that is turned on in the first bridge arm group is controlled to be turned off, and the upper bridge arm corresponding to the disconnected bridge arm is turned on.

18. The method according to any one of claims 12 to 16, in, The first heating module includes a first switch module, and the second heating module includes a second switch module; the first switch module includes a first bridge arm group, and the second switch module includes a second bridge arm group; the positive side of the first battery is connected to the positive side of the second battery, the upper bridge arm of the first switch module, and the upper bridge arm of the second switch module; the negative side of the first battery is connected to the lower bridge arm of the first switch module, and the negative side of the second battery is connected to the lower bridge arm of the second switch module; The controlling the second battery to discharge into the first battery comprises: Controlling the upper bridge arm of any phase in the first bridge arm group and the lower bridge arm of any phase in the second bridge arm group to be turned on; The turned-on upper bridge arm in the first bridge arm group is controlled to be turned off, and the upper bridge arm corresponding to the turned-off bridge arm is turned on.

19. A computing device, in, include: Memory: used to store executable instructions; as well as Processor: used to connect to the memory to execute executable instructions to complete the charging and discharging method as described in any one of claims 10-18.

20. A computer-readable storage medium, in, A computer program is stored thereon; the computer program is executed by a processor to implement the method according to any one of claims 10-18.

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