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

Abstract

The embodiment of the invention provides a charging and discharging circuit and method, computing equipment and a storage medium thereof, two energy storage elements in the charging and discharging circuit are connected through a first adjusting switch module, heating control is carried out after a switch is closed, and self-heating of a battery is realized by utilizing alternating current generated by a charging and discharging loop between a dual-drive motor and the battery; according to the invention, the charging and discharging loop between the power battery and the energy storage element can be flexibly adjusted under the condition that the original motor structure is not changed; the battery self-heating scheme can be carried out by flexibly adjusting charging and discharging of the double-drive motor while the cost is reduced, and the heating rate is increased.

Description

Technical Field

[0001] 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

[0002] Due to the advantages of high energy density, rechargeable, safe and environmentally friendly, power modules such as rechargeable batteries are widely used in new energy vehicles, consumer electronics, energy storage systems and other fields. With the development of battery technology and the needs of different vehicles and usage scenarios, the requirements for battery self-heating performance are becoming more and more diverse.

[0003] Among them, regarding the battery self-heating solution in the dual-drive motor use scenario, its heating solution is single and costly. How to control the battery heating in the dual-motor system, reduce the battery heating cost, and increase the heating rate of large-capacity batteries is an urgent problem to be solved. The above statements are only used to provide background technical information related to this application and do not necessarily constitute prior art. Summary of the invention

[0004] 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 realize 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.

[0005] Specifically, by leading out the neutral point of the motor and controlling the heating after the switch is closed, the heating change point of the dual motors is reduced, the heating cost is reduced, and the battery heating rate is increased.

[0006] In the first aspect, the present application provides a charging and discharging circuit, including 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.

[0007] 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 to increase the heating rate.

[0008] 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.

[0009] 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.

[0010] The charging and discharging circuit provided in the embodiment of the present application, by leading out the neutral point of the motor and then closing the connection through the first regulating switch module to perform circuit heating control, not only reduces the heating change point of the dual motors, reduces the heating cost, but also improves the battery heating rate; while reducing the cost, 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 a variety of scenarios.

[0011] 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.

[0012] The charging and discharging circuit provided in the embodiment of the present application, the power module includes 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 realize 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 then the self-heating method of the power battery is flexibly adjusted to match the heating requirements of various scenarios.

[0013] 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.

[0014] The charging and discharging circuit provided in the embodiment of the present application, the power module includes two battery branches, a first battery and a second battery, and the two batteries are connected by a second regulating switch module, and the change of the connection mode of the electrically adjustable battery branches is controlled to match different charging and discharging requirements in the heating circuit, improve the system adaptability of the motor and increase the battery heating rate.

[0015] 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.

[0016] In the charging and discharging circuit provided in the embodiment of the present application, the first battery and the second battery included in the power module are connected on the positive side through the 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.

[0017] 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.

[0018] In the charging and discharging circuit provided in the embodiment of the present application, the first battery and the second battery included in the power module are connected on the negative electrode side through the second regulating switch module to form a common negative electrode 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.

[0019] 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.

[0020] 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 to increase the heating rate.

[0021] 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.

[0022] 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 to increase the heating rate.

[0023] In the second aspect, the present application provides an electrical equipment, including a control module and any one of the above charging and discharging circuits; 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.

[0024] 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 the dual-drive motor scenario, and flexibly adjusts the charging and discharging of the power module by adjusting the switch modules in the two groups of motors, thereby flexibly adjusting the self-heating method of the power battery to match the heating requirements of various scenarios; while reducing costs, it is possible to flexibly adjust the charging and discharging of the dual-drive motors to perform a battery self-heating solution to meet the heating requirements in various scenarios.

[0025] In a third aspect, the present application provides a charging and discharging method, which is applied to the electrical equipment of the second aspect, comprising: 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.

[0026] 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 to flexibly adjust the charging and discharging of the power module, it is possible to flexibly adjust the charging and discharging of the dual-drive motor to perform a battery self-heating scheme while reducing costs, thereby improving the heating rate.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] The charging and discharging method provided in the embodiment of the present application controls the first battery to discharge to the second battery in the first time period; and controls the second battery to discharge to the first battery in the second time period, thereby being able to flexibly adjust the charging and discharging of the dual-drive motor to perform a battery self-heating scheme and improve the heating rate while reducing costs.

[0031] In some embodiments, controlling the first battery to discharge to the second battery includes: in a first period, controlling the first battery to discharge to 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 to the second battery.

[0032] The embodiment provided in this application specifically discloses that when controlling the first battery to discharge to the second battery, the first battery is controlled to discharge to the first energy storage element and the second energy storage element in the first period; the first energy storage element and the second energy storage element are controlled to discharge to the second battery in the second period, and in the self-heating process of the power module, continuous self-heating is achieved through different controls in different periods. The battery self-heating scheme is realized by flexibly adjusting the charging and discharging of the dual-drive motor to improve the heating rate.

[0033] 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 turned-on lower bridge arm of the second bridge arm group to be turned off, and turning on the upper bridge arm corresponding to the disconnected bridge arm.

[0034] The charging and discharging method provided in the embodiment of the present application specifically controls 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 by specifically controlling the first time period when adjusting the discharge of the first battery to the second battery; and controls the lower bridge arm of the second bridge arm group to be turned off in the second time period, and turns on the upper bridge arm corresponding to the turned off bridge arm. During the self-heating process of the power module, continuous self-heating is achieved through different controls in different time periods.

[0035] 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.

[0036] The charging and discharging method provided in the embodiment of the present application specifically controls 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 by specifically controlling the first time period when adjusting the discharge of the first battery to the second battery; in the second time period, the upper bridge arm that is turned on in the second bridge arm group is controlled to be turned off, and the lower 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 controls in different time periods.

[0037] 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.

[0038] The embodiment provided in this application specifically discloses that when the second battery is controlled to discharge to the first battery, the second battery is controlled to discharge to the first energy storage element and the second energy storage element in the first period; the first energy storage element and the second energy storage element are controlled to discharge to the first battery in the second period, and in the self-heating process of the power module, continuous self-heating is achieved through different controls in different periods. The battery self-heating scheme is realized by flexibly adjusting the charging and discharging of the dual-drive motor to improve the heating rate.

[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 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 second battery is controlled to discharge to the first battery, including: in the first time 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 are controlled to be turned on; in the second time period, 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.

[0040] The charging and discharging method provided in the embodiment of the present application specifically controls 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 by specifically controlling the first time period when adjusting the discharge of the second battery to the first battery; and controls the turned-on lower bridge arm in the first bridge arm group to be turned off in the second time period, and turns on the upper bridge arm corresponding to the turned-off bridge arm. During the self-heating process of the power module, continuous self-heating is achieved through different controls in different time periods.

[0041] 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 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 turned-on upper bridge arm in the first bridge arm group to be turned off, and turning on the upper bridge arm corresponding to the turned-off bridge arm.

[0042] The charging and discharging method provided in the embodiment of the present application specifically controls 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 by specifically controlling the first time period when adjusting the discharge of the second battery to the first battery; in the second time period, the upper 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. During the self-heating process of the power module, continuous self-heating is achieved through different controls in different time periods.

[0043] 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 any one of the third aspect.

[0044] In the computing device 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 to increase the heating rate.

[0045] 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.

[0046] The computer-readable storage medium provided in the embodiment of the present application has two energy storage elements 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 to increase the heating rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. 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 paying creative work.

[0048] Figure 1 A modular schematic diagram of a charge and discharge circuit according to one or more embodiments.

[0049] Figure 2 A circuit diagram of a charging and discharging circuit according to one or more embodiments Figure 1 .

[0050] Figure 3 A circuit diagram of a charging and discharging circuit according to one or more embodiments Figure 2 .

[0051] Figure 4 A circuit diagram of a charging and discharging circuit according to one or more embodiments Figure 3 .

[0052] Figure 5 A circuit diagram of a charging and discharging circuit according to one or more embodiments Figure 4 .

[0053] Figure 6 is a schematic diagram of the structure of an electric device according to one or more embodiments.

[0054] Figure 7 The figure is a schematic diagram of the steps of a charging and discharging method according to one or more embodiments.

[0055] Figure 8 A schematic diagram of steps for regulating charging and discharging between batteries of a power module according to one or more embodiments.

[0056] Fig. 9 The figure is a schematic diagram of steps of controlling a first battery to discharge into a second battery according to one or more embodiments.

[0057] Fig.10The figure is a schematic diagram of steps of controlling the second battery to discharge into the first battery according to one or more embodiments.

[0058] Fig.11 A circuit diagram of a first battery discharging to a second battery in a charging and discharging method according to one or more embodiments Figure 1 .

[0059] Fig.12 A circuit diagram of a first battery discharging to a second battery in a charging and discharging method according to one or more embodiments Figure 2 .

[0060] Fig.13 A circuit diagram of a second battery discharging to a first battery in a charging and discharging method according to one or more embodiments Figure 1 .

[0061] Fig.14 A circuit diagram of a second battery discharging to a first battery in a charging and discharging method according to one or more embodiments Figure 2 .

[0062] Fig.15 A circuit diagram of a first battery discharging to a second battery in a charging and discharging method according to one or more embodiments Figure 1 .

[0063] Fig.16 A circuit diagram of a first battery discharging to a second battery in a charging and discharging method according to one or more embodiments Figure 2 .

[0064] Fig.17 A circuit diagram of a second battery discharging to a first battery in a charging and discharging method according to one or more embodiments Figure 1 .

[0065] Fig.18 A circuit diagram of a second battery discharging to a first battery in a charging and discharging method according to one or more embodiments Figure 2 .

[0066] Fig.19 is a schematic diagram of a computing device according to one or more embodiments.

[0067] In the drawings, the drawings are not drawn to scale. DETAILED DESCRIPTION

[0068] The following detailed description and drawings of the embodiments of the present application are used to illustrate the principles of the present application, but cannot be used to limit the scope of the present application, that is, the present application is not limited to the described embodiments.

[0069] In the description of the present application, it should be noted that, unless otherwise specified, "multiple" means more than two; the terms "upper", "lower", "left", "right", "inside", "outside", etc., indicating the orientation or positional relationship, are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present 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 vertical, but is within the allowable error range. "Parallel" is not strictly parallel, but is within the allowable error range.

[0070] The directional words appearing in the following description are all 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 "install", "connect", and "connect" 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 ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0071] With the development of battery technology, various performances 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 the battery heating cost, and increase the heating rate of large-capacity batteries is an urgent problem to be solved.

[0072] In addition, regarding the battery self-heating solution in the dual-drive motor usage scenario, the coordinated control of the dual-motor controller is very important. It is very important to reduce the noise, vibration and harshness NVH (Noise, Vibration, Harshness) and rotor heating problems generated during the battery heating process and increase the battery heating rate. These are directly related to the customer's experience.

[0073] 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.

[0074] Specifically, by leading out the neutral point of the motor and controlling the heating after the switch is closed, the heating change point of the dual motors is reduced, the heating cost is reduced, and the battery heating rate is increased.

[0075] 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 switch module of the motor, 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-ion 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 battery cell monomer, or a battery module or a 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 motors of power vehicles as a power source for electric vehicles. The battery can also power other electrical devices in electric vehicles, such as air conditioners and car players in the car.

[0076] For the convenience of description, the following will be described by taking the application of the power module to a new energy vehicle (power vehicle) as an example.

[0077] The drive motor and its control system are one of the core components of new energy vehicles. Its driving characteristics determine the main performance indicators of the vehicle. The motor drive system of new energy vehicles is mainly composed of electric motors (i.e. motors), power converters, motor controllers (e.g., inverters), various detection sensors, and power supplies. The motor is a rotating electromagnetic machine that operates on the principle of electromagnetic induction and is used to realize the conversion of electrical energy into mechanical energy. During operation, it absorbs electrical power from the electrical system and outputs mechanical power to the mechanical system.

[0078] Optionally, the electrical devices and computing equipment include but are not limited to vehicles, ships, or spacecraft.

[0079] Generally, the existing battery heating control strategy in the battery heating process has the problem of low battery heating rate during battery pulse heating, high rotor magnetic steel temperature and large vibration noise. These problems are prominent in the market, reducing the customer's experience of use. 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; can flexibly adjust the charging and discharging of the dual-drive motor to perform battery self-heating scheme and improve the heating rate while reducing costs.

[0080] In principle, the battery heating scheme of the embodiment of the present application can be based on a battery system in which multiple branch batteries are connected in parallel to supply power. It is necessary to change the physical connection of the battery so that the two-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 flow of pulse current between multiple battery packs.

[0081] The reverse series structure of batteries is to reorganize the connection of circuits 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.

[0082] In principle, the battery heating scheme of the embodiment of the present application is also based on a system where multiple branch batteries independently power the motor, so there is no need to change the connection method between the batteries. By leading out 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 to generate the same-phase current to weaken the synthetic magnetic field amplitude generated by the stator coil being energized during the heating process of the motor, thereby suppressing the NVH and rotor heating problems caused by the original motor heating scheme.

[0083] 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.

[0084] The implementation scheme of the embodiment of the present application is described as a whole as follows.

[0085] 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.

[0086] When the BMS sends a heating request, the VCU determines that the battery SOC status and the motor operating status meet the heating conditions;

[0087] Different control methods are used for specific dual-motor circuit topology structures, including two dual-motor circuit systems: one is a dual-motor system powered by multiple branch batteries in parallel, and the other is a dual-motor system in which multiple branch batteries independently power the motors.

[0088] For the first situation 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.

[0089] 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 of the two battery groups, and generate heat inside the battery.

[0090] During heating, the BMS determines whether the battery pack temperature is abnormal. If so, it sends the 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 form.

[0091] During heating, the BMS determines whether the battery pack temperature meets the requirements. If so, the vehicle controller forwards the stop driving pulse heating information to the motor controller, stops heating, and switches the battery pack to the initial mode. Otherwise, the above heating process is repeated until the heating temperature meets the requirements.

[0092] 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.

[0093] 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 relatively low cost.

[0094] The following describes the charging and discharging circuit and the 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.

[0095] In order to make the technical solutions and advantages in the embodiments of the present application more clearly understood, the exemplary embodiments of the present application are further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than an exhaustive list of all the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0096] To facilitate 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.

[0097] Figure 1 It is a modular schematic diagram of a charging and discharging circuit provided in an embodiment of the present application. Figure 2Schematic diagram of a charging and discharging circuit 100 provided in an embodiment of the present application.

[0098] like Figure 1 As shown, 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.

[0099] 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.

[0100] 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 circuits between the power battery and the energy storage element are flexibly adjusted to realize the self-heating of the batteries of the dual motors; the charging and discharging of the power module 10 is flexibly adjusted by adjusting the first switch module 201 and the second switch module 301 in the two groups of motors, and then the self-heating method of the power battery is flexibly adjusted to match the heating requirements of various scenarios.

[0101] 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 .

[0102] 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, reduces the heating cost, but also improves the battery heating rate; while reducing the cost, the charging and discharging of the dual-drive motors are flexibly adjusted to perform a battery self-heating solution to meet the heating needs in various scenarios.

[0103] Figure 2 A circuit diagram of a charging and discharging circuit according to one or more embodiments Figure 1 . Figure 3 A circuit diagram of a charging and discharging circuit according to one or more embodiments Figure 2 .

[0104] like Figure 2 and Figure 3 The invention belongs to a charging and discharging circuit based on a power system in which multiple branch batteries independently supply power to a motor.

[0105] 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 .

[0106] The charging and discharging circuit provided in the embodiment of the present application is that during the operation of the motor, the first battery B1 and the second battery B2 independently supply power to the motors connected to them. The power module 10 includes two battery branches, the first battery B1 and the second battery B2. In the dual-drive motor scenario, the charging and discharging circuits between the two batteries and the energy storage element can be flexibly adjusted to achieve self-heating of the batteries of the dual motors; the charging and discharging of the power module 10 can be flexibly adjusted by adjusting the first switch module 201 and the second switch module 301 in the two groups of motors, and then the self-heating method of the power battery can be flexibly adjusted to match the heating requirements of various scenarios.

[0107] Figure 4 A circuit diagram of a charging and discharging circuit according to one or more embodiments Figure 3 . Figure 5 A circuit diagram of a charging and discharging circuit according to one or more embodiments Figure 4 .

[0108] like Figure 4 and Figure 5 As shown, it is a charging and discharging circuit based on a power system based on multi-branch batteries connected in parallel for power supply.

[0109] 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.

[0110] 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 control the change of the connection mode of the electrically adjustable battery branches to match different charging and discharging requirements in the heating circuit, improve the system adaptability of the motor and increase the battery heating rate.

[0111] like Figure 4 As shown, 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.

[0112] 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 which are 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.

[0113] like Figure 5 As shown, 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.

[0114] 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 which are connected on the negative electrode side through a second regulating switch module to form a common positive electrode 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.

[0115] In terms of connecting the power module 10 to the dual motors, it can be implemented as follows: Figure 2 and Figure 4 As shown, based on the dual-motor heating topology with a common negative electrode of the battery, 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.

[0116] 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 to increase the heating rate.

[0117] In terms of connecting the power module 10 to the dual motors, it can be implemented as follows: Figure 3 and Figure 5 As shown, based on the battery common positive pole dual motor heating topology, 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.

[0118] 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 to increase the heating rate.

[0119] 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.

[0120] The above description of various embodiments tends to emphasize the differences between the various embodiments. The same or similar aspects can be referenced to each other, and for the sake of brevity, they will not be repeated herein.

[0121] Figure 6 is a schematic diagram of the structure of an electric device according to one or more embodiments.

[0122] like Figure 6 As shown, 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 20 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 adjust the charge and discharge between the batteries of the power module 10.

[0123] 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 the dual-drive motor scenario, and flexibly adjusts the charging and discharging of the power module 10 by adjusting the switch modules in the two groups of motors, thereby flexibly adjusting the self-heating method of the power battery to match the heating requirements of various scenarios; while reducing costs, it is possible to flexibly adjust the charging and discharging of the dual-drive motors to perform a battery self-heating solution to meet the heating requirements in various scenarios.

[0124] Figure 7 The figure is a schematic diagram of the steps of a charging and discharging method according to one or more embodiments.

[0125] like Figure 7 As shown, the present application provides a charging and discharging method, which is applied to an electric device 200, comprising:

[0126] S1: in response to a battery heating instruction, controlling the first regulating switch module to be turned on;

[0127] S2: Regulating the charging and discharging of the batteries in the power module 10 .

[0128] 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 to flexibly adjust the charging and discharging of the power module 10, it is possible to flexibly adjust the charging and discharging of the dual-drive motor to perform a battery self-heating scheme while reducing costs, thereby improving the heating rate.

[0129] 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.

[0130] 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.

[0131] Figure 8 FIG. 1 is a schematic diagram of steps for regulating the charge and discharge between batteries of the power module 10 according to one or more embodiments.

[0132] like Figure 8 As shown, 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:

[0133] S21: in the first period, controlling the first battery B1 to discharge to the second battery B2.

[0134] S22: in the second period, the second battery B2 is controlled to discharge into the first battery B1; wherein the control of the first period and the second period is continuously and alternately performed.

[0135] The charging and discharging method provided in the embodiment of the present application controls the first battery B1 to discharge to the second battery B2 during the first period; and controls the second battery B2 to discharge to the first battery B1 during the second period, thereby being able to flexibly adjust the charging and discharging of the dual-drive motor to perform a battery self-heating scheme and improve the heating rate while reducing costs.

[0136] Fig. 9 FIG. 1 is a schematic diagram of steps of controlling the first battery B1 to discharge into the second battery B2 according to one or more embodiments.

[0137] like Fig. 9 As shown, in some embodiments, specifically, controlling the first battery B1 to discharge to the second battery B2 in S21 includes:

[0138] S211: In 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;

[0139] S212: in the second period, controlling the first energy storage element 202 and the second energy storage element 302 to discharge to the second battery B2.

[0140] The embodiment provided in this application specifically discloses that when the first battery B1 is controlled to discharge to the second battery B2, the first battery B1 is controlled to discharge to the first energy storage element 202 and the second energy storage element 302 during the first period; the first energy storage element 202 and the second energy storage element 302 are controlled to discharge to the second battery B2 during the second period. During the self-heating process of the power module 10, continuous self-heating is achieved through different controls at different periods. The battery self-heating scheme is realized by flexibly adjusting the charging and discharging of the dual-drive motor to improve the heating rate.

[0141] Applied to topological circuits, such as Figure 2 and Figure 4 As shown, based on the battery common negative pole dual motor heating topology. 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 first battery B1 to discharge to the second battery B2 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 lower bridge arm of the second bridge arm group to be turned off, and turning on the upper bridge arm corresponding to the turned off bridge arm.

[0142] Applied to topological circuits, such as Figure 3 and Figure 5 As shown, based on the battery common positive pole dual motor heating topology. 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 first battery B1 to discharge to the second battery B2 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 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.

[0143] Fig.10 FIG. 1 is a schematic diagram of steps of controlling the second battery B2 to discharge into the first battery B1 according to one or more embodiments.

[0144] like Fig.10 As shown, in some embodiments, controlling the second battery B2 to discharge to the first battery B1 in S22 includes:

[0145] S221 : in a first period, controlling the second battery B2 to discharge to the first energy storage element 202 and the second energy storage element 302 .

[0146] 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.

[0147] The embodiment provided in this application specifically discloses that when the second battery B2 is controlled to discharge to the first battery B1, the second battery B2 is controlled to discharge to the first energy storage element 202 and the second energy storage element 302 during the first period; the first energy storage element 202 and the second energy storage element 302 are controlled to discharge to the first battery B1 during the second period. During the self-heating process of the power module 10, continuous self-heating is achieved through different controls at different periods. The battery self-heating scheme is realized by flexibly adjusting the charging and discharging of the dual-drive motor to improve the heating rate.

[0148] Applied to topological circuits, such as Figure 2 and Figure 4 As shown, based on the battery common negative pole dual motor heating topology. 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 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 turned-off bridge arm.

[0149] Applied to topological circuits, such as Figure 3 and Figure 5 As shown, based on the battery common positive pole dual motor heating topology. The first switch module includes a first bridge arm group, and the second switch module includes a second bridge arm group; the second battery is controlled to discharge to the first battery, including a 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 turned-on upper bridge arm in the first bridge arm group to be turned off, and turning on the upper bridge arm corresponding to the turned-off bridge arm.

[0150] The following are specific Figure 2 Taking the dual-motor heating topology structure with multi-branch batteries powered in parallel as an example, the charging and discharging principle of the embodiment of the present application is further explained based on the case of a common negative electrode of the batteries. Figure 4 The principle of dual motor heating with multi-branch batteries independently supplying power to the motors is referenced Figure 2 .

[0151] First: the battery system BMS (Battery Management System) collects the battery pack temperature, power SOC, voltage, and current signals to determine whether the battery is working normally and whether the battery meets the heating conditions; the motor controller MCU (Motor control unit) collects the 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.

[0152] Then: When the BMS sends a heating request, the VCU determines that the battery SOC state and the motor working state meet the heating conditions;

[0153] Secondly: different control methods are used for specific dual-motor circuit topology structures, including two dual-motor circuit systems, one is a dual-motor system powered by multiple branch batteries in parallel, and the other is a dual-motor system in which multiple branch batteries independently power the motors.

[0154] For the first type Figure 2 In the case of multiple branch batteries connected in parallel for power supply, it is necessary to first change the connection mode of the battery pack, switching the battery pack from parallel mode to reverse series mode; for the second case, Figure 4 The structural topology shown in the figure is that the battery pack supplies power to two motor systems independently, so there is no need to change the battery connection method.

[0155] like Figure 2 As shown, the motor controller or BMS controls k2 to disconnect, and the battery switches from the parallel state to the reverse series state. At this time, the negative poles of the two battery packs are connected and the positive poles are disconnected.

[0156] 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.

[0157] Fig.11 A circuit diagram of a first battery discharging to a second battery in a charging and discharging method according to one or more embodiments Figure 1 . Fig.12 A circuit diagram of a first battery discharging to a second battery in a charging and discharging method according to one or more embodiments Figure 2 .

[0158] like Fig.11As shown, in the first stage, the upper bridge arm of the first motor controller and the lower bridge arm of the second motor controller are controlled to be closed, the battery B1 is in a discharge state, and the motor inductor is used to store energy and boost the voltage. At this time, the battery current flows as follows: B1 positive → V1, V2, V3 → LA1, LB1, LC1 → LA2, LB2, LC2 → V10, V11, V12 → B1 negative.

[0159] like Fig.12 As shown, in the second stage, the upper bridge arm of the first motor controller and the upper bridge arm of the second motor controller are controlled to be closed, and the motor equivalent inductance releases the energy stored in the first stage to the battery B2, the battery B1 is in a discharging state, and the battery B2 is in a charging state. At this time, 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. At the same time, in order to maintain the state of battery B1 discharging and battery B2 charging, the time for battery B1 to charge battery B2 can be controlled by controlling the time for the upper and lower bridge arms of the second motor controller to switch back and forth.

[0160] Fig.13 A circuit diagram of a second battery discharging to a first battery in a charging and discharging method according to one or more embodiments Figure 1 . Fig.14 A circuit diagram of a second battery discharging to a first battery in a charging and discharging method according to one or more embodiments Figure 2 .

[0161] like Fig.13 As shown, in the third stage, the lower bridge arm of the first motor controller and the upper bridge arm of the second motor controller are controlled to be 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.

[0162] like Fig.14 As shown, 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 controlled to be closed, and the motor equivalent inductance releases the energy stored in the third stage to the battery B1, the battery B2 is in a discharging state, and the battery B1 is in a charging state. At this time, 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 time for battery B2 to charge battery B1 can be controlled by controlling the time for the upper bridge arm and the lower bridge arm of the first motor controller to switch back and forth.

[0163] It is preferred 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 change of the magnetic field on the rotor.

[0164] The dual motors can be permanent magnet motors and induction motors to achieve low-temperature pulse heating. The first motor can also pass three-phase current, and the second motor can be one of the three phases for the above self-heating control. The corresponding effect is that the inductance of the second motor changes from the original three-phase inductance in parallel to a single-phase inductance to participate in the heating process, and the inductance involved in energy conversion is increased, so that the rate of change of the heating current is slowed down. Under the same voltage platform and the same control time, the peak value of the heating current on the motor side can be effectively improved.

[0165] Finally, while heating, the BMS determines whether the battery pack temperature is abnormal. If so, it sends the 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 form.

[0166] During heating, the BMS determines whether the battery pack temperature meets the requirements. If so, the vehicle controller forwards the pulse heating information to the motor controller to stop heating, and the battery pack switches to the initial mode. Otherwise, the above heating process is repeated until the heating temperature meets the requirements. 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.

[0167] Next, specifically Figure 3 Taking the dual-motor heating topology structure with multi-branch batteries powered in parallel as an example, the charging and discharging principles of the embodiment of the present application are further explained based on the case of a common positive electrode of the batteries. Figure 5 The principle of dual motor heating with multi-branch batteries independently supplying power to the motors is referenced Figure 3 .

[0168] First: the battery system BMS (Battery Management System) collects the battery pack temperature, power SOC, voltage, and current signals to determine whether the battery is working normally and whether the battery meets the heating conditions; the motor controller MCU (Motor control unit) collects the 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.

[0169] Then: when the BMS sends a heating request, the VCU determines whether the battery SOC state and the motor working state meet the heating conditions; secondly: different control methods are used for the specific dual-motor circuit topology. Specifically, there are two dual-motor circuit systems, one is a dual-motor system with multiple branch batteries connected in parallel, and the other is a dual-motor system with multiple branch batteries independently supplying power to the motor.

[0170] For the first type Figure 3 In the case of multiple branch batteries connected in parallel for power supply, it is necessary to first change the connection mode of the battery pack, switching the battery pack from parallel mode to reverse series mode; for the second case, Figure 5 The structural topology shown in the figure is that the battery pack supplies power to two motor systems independently, so there is no need to change the battery connection method.

[0171] like Figure 3 As shown, the motor controller or BMS controls k2 to disconnect, and the battery switches from the parallel state to the reverse series state. At this time, the negative poles of the two battery packs are connected and the positive poles are disconnected.

[0172] 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.

[0173] Fig.15 A circuit diagram of a first battery discharging to a second battery in a charging and discharging method according to one or more embodiments Figure 1 . Fig.16 A circuit diagram of a first battery discharging to a second battery in a charging and discharging method according to one or more embodiments Figure 2 .

[0174] like Fig.15 As shown, in the first stage, 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 are controlled to be turned on, the battery B1 is in a discharge state, and the motor inductor is used to store energy and boost the voltage. At this time, the battery current flows as follows: B1 positive → V7, ​​V8, V9 → LA2, LB2, LC2 → LA1, LB1, LC1 → V4, V5, V6 → B1 negative.

[0175] like Fig.16As shown, in the second stage, 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 stage to battery B2, and battery B1 is in a discharging state, and battery B2 is in a charging state. 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. At the same time, in order to maintain the state of battery B1 discharging and battery B2 charging, the time for battery B1 to charge battery B2 can be controlled by controlling the time for the upper and lower bridge arms of the second motor controller to switch back and forth.

[0176] Fig.17 A circuit diagram of a second battery discharging to a first battery in a charging and discharging method according to one or more embodiments Figure 1 . Fig.18 A circuit diagram of a second battery discharging to a first battery in a charging and discharging method according to one or more embodiments Figure 2 .

[0177] like Fig.17 As shown, 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, the battery B2 is in a discharging state, and the motor inductance 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.

[0178] like Fig.18 As shown, in the fourth stage, the upper bridge arm that is turned on 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, and the motor equivalent inductance releases the energy stored in the third stage to battery B1, battery B2 is in a discharging state, and battery B1 is in a charging state. At this time, 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 time for battery B2 to charge battery B1 can be controlled by controlling the time for the upper bridge arm and the lower bridge arm of the first motor controller to switch back and forth.

[0179] It is preferred 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 change of the magnetic field on the rotor.

[0180] The dual motors can be permanent magnet motors and induction motors to achieve low-temperature pulse heating. The first motor can also pass three-phase current, and the second motor can be one of the three phases for the above self-heating control. The corresponding effect is that the inductance of the second motor changes from the original three-phase inductance in parallel to a single-phase inductance to participate in the heating process, and the inductance involved in energy conversion is increased, so that the rate of change of the heating current is slowed down. Under the same voltage platform and the same control time, the peak value of the heating current on the motor side can be effectively improved.

[0181] Finally, while heating, the BMS determines whether the battery pack temperature is abnormal. If so, it sends the 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 form.

[0182] During heating, the BMS determines whether the battery pack temperature meets the requirements. If so, the vehicle controller forwards the stop driving pulse heating information to the motor controller, stops heating, and switches the battery pack to the initial mode. Otherwise, the above heating process is repeated until the heating temperature meets the requirements.

[0183] 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.

[0184] 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 any one of the third aspect.

[0185] In the computing device 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 to increase the heating rate.

[0186] 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.

[0187] The computer-readable storage medium provided in the embodiment of the present application has two energy storage elements 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 to increase the heating rate.

[0188] The above description of various embodiments tends to emphasize the differences between the various embodiments. The same or similar aspects can be referenced to each other, and for the sake of brevity, they will not be repeated herein.

[0189] Fig.19 A schematic diagram of the structure of a computing device 400 according to an embodiment of the present application is shown in FIG.

[0190] like Fig.19 As shown, the computing device 400 includes: a memory 402 for storing executable instructions; and a processor 401 for connecting with the memory 402 to execute the executable instructions to complete the motion vector prediction method.

[0191] Those skilled in the art will understand that Fig.19 This is only an example of the computing device 400 and does not constitute a limitation of 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.

[0192] The processor 401 (Central Processing Unit, CPU) may also be other general-purpose processors, digital signal processors (Digital Signal Processor, DSP), application-specific integrated circuits (Application Specific Integrated Circuit, ASIC), field-programmable gate arrays (Field-Programmable Gate Array, 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 also be any conventional processor, etc. The processor 401 is the control center of the computing device 400, and uses various interfaces and lines to connect various parts of the entire computing device 400.

[0193] The memory 402 can be used to store computer-readable instructions. The processor 401 implements various functions of the computing device 400 by running or executing the computer-readable instructions or modules stored in the memory 402 and calling the data stored in the memory 402. The memory 402 can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, an application required for at least one function (such as a sound playback function, an image playback function, etc.), etc.; the data storage area can store data created according to the use of the computing device 400, etc. In addition, the memory 402 can include a hard disk, a memory, a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), at least one disk storage device, a flash memory device, a read-only memory (Read-Only Memory, ROM), a random access memory (Random Access Memory, RAM) or other non-volatile / volatile storage devices.

[0194] If the module integrated in the computing device 400 is implemented in the form of a software function module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present invention implements all or part of the processes in the above-mentioned embodiment method, and can also instruct the relevant hardware to complete it through computer-readable instructions. The computer-readable instructions can be stored in a computer-readable storage medium. When the computer-readable instructions are executed by the processor, the steps of the above-mentioned various method embodiments can be implemented.

[0195] 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 realizing flexible adjustment of the charging and discharging of the power module 10 in a variety of scenarios, and flexible adjustment of the self-heating method of the battery. 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.

[0196] 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.

[0197] Those of ordinary skill 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 to be beyond the scope of this application.

[0198] Those skilled in the art can 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.

[0199] In the several embodiments provided in the present 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 only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, 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.

[0200] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0201] 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.

[0202] 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 can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods 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.

[0203] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A charging and discharging circuit, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: include: 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, characterized in that 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, characterized in that: 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, characterized in that 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, characterized in that 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, characterized in that 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 claim 12, characterized in that 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 claim 12 or 16, characterized in that 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 claim 12 or 16, characterized in that 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, characterized in that include: Memory: used to store executable instructions; and 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, characterized in that: 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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