WO2023226562A1

WO2023226562A1 - Method and apparatus for controlling charging and discharging circuit, and device, system, and storage medium

Info

Publication number: WO2023226562A1
Application number: PCT/CN2023/082783
Authority: WO
Inventors: 李占良; 赵元淼; 黄孝键; 但志敏; 颜昱; 陈新伟
Original assignee: 宁德时代新能源科技股份有限公司
Priority date: 2022-05-23
Filing date: 2023-03-21
Publication date: 2023-11-30
Also published as: CN115378063B; CN115378063A

Abstract

Disclosed in the present application are a method and apparatus for controlling a charging and discharging circuit, and a device, a system, and a storage medium. The method comprises: sending charging and discharging enable signals, controlling a switch module and a charging and discharging switching module to act, and forming, in a charging and discharging circuit, a first charging and discharging loop and a second charging and discharging loop which are alternately switched; the first charging and discharging loop comprising a first discharging loop for a first battery pack to discharge an energy storage module and a first charging loop for the energy storage module to charge a second battery pack; and the second charging and discharging loop comprising a second discharging loop for the second battery pack to discharge the energy storage module and a second charging loop for the energy storage module to charge the first battery pack. According to the method of the present application, alternating current flows between the at least two battery packs, the internal self-heating of the battery packs is achieved, the fast heating current frequency in a larger range can be achieved, the low-frequency self-heating of the battery packs can be achieved, the self-heating efficiency is high, and the self-heating effect is good.

Description

Control methods, devices, equipment, systems and storage media for charge and discharge circuits

Technical field

This application relates to the field of battery technology, and specifically to a control method, device, equipment, system and storage medium for a charge and discharge circuit.

Background technique

Power batteries such as lithium-ion batteries have the advantages of high power density, high cycle life and good environmental protection effect. They have become increasingly popular in many fields, especially in the field of electric transportation. For example, power batteries are used as power. sources of electric vehicles, etc. However, the charging and discharging power and charging and discharging capacity of the power battery are greatly attenuated at low temperatures. Therefore, it is usually necessary to charge and discharge the power battery to achieve self-heating of the power battery. The existing technology lacks a technical solution for controlling the charge and discharge circuit of the power battery. When charging and discharging the power battery to achieve self-heating, the efficiency is low and the heating effect is poor.

Contents of the invention

In view of the above problems, the present application provides a control method, device, equipment, system and storage medium for a charging and discharging circuit, which can solve the lack of technical solutions for controlling the charging and discharging circuit of a power battery in the prior art, and perform the control of a power battery. When charging and discharging to achieve self-heating, the efficiency is low and the heating effect is poor. In order to provide a basic understanding of some aspects of the disclosed embodiments, a simplified summary is provided below. This summary is not intended to be an extensive review, nor is it intended to identify key/important elements or to delineate the scope of these embodiments. Its sole purpose is to present a few concepts in a simplified form as a prelude to the more detailed explanation that follows.

A first aspect of the embodiment of the present application provides a method for controlling a charge and discharge circuit. The charge and discharge circuit includes a switch module, an energy storage module, a charge and discharge switching module, and at least a first battery group and a second battery group; Methods include:

Send a charge and discharge enable signal, control the switch module and the charge and discharge switching module to act, and form a first charge and discharge circuit and a second charge and discharge circuit that are alternately switched in the charge and discharge circuit;

The first charge and discharge circuit includes a first discharge circuit through which the first battery pack discharges the energy storage module and a first charging circuit through which the energy storage module charges the second battery pack;

The second charge and discharge circuit includes a second discharge circuit through which the second battery pack discharges the energy storage module and a second charging circuit through which the energy storage module charges the first battery pack.

By controlling the operation of the switch module and the charge-discharge switching module, an alternately switched first charge-discharge circuit and a second charge-discharge circuit are formed in the charge-discharge circuit, thereby realizing the flow of alternating current between the at least two battery groups. The internal self-heating of the battery pack can achieve a wider range of fast heating current frequencies, and can achieve low-frequency self-heating of the battery pack. During low-frequency self-heating, the equivalent impedance of the battery pack cells is greater, so the self-heating efficiency is high and the self-heating The effect is better and the temperature rise rate is higher.

In some embodiments, sending the charge and discharge enable signal to control the switch module and the charge and discharge switching module to perform actions includes:

The first charge and discharge enable signal and the second charge and discharge enable signal are alternately sent according to a preset frequency, and the switch module and the charge and discharge switching module are controlled to operate. By controlling the switching module and the charge-discharge switching module to operate according to the preset frequency, a first charge-discharge circuit and a second charge-discharge circuit are formed that alternately switch. The frequency of the AC current generated in the entire charge-discharge circuit can be adjusted, thereby improving the battery life. The rate at which the group is heated.

In some embodiments, the first discharge circuit maintenance time is equal to the first charging circuit maintenance time; the second discharge circuit maintenance time is equal to the second charging circuit maintenance time, thereby ensuring that the energy storage module Each time it is discharged, the electric energy stored in the energy storage module can be fully charged into the corresponding battery pack.

In some embodiments, the charge and discharge switching module includes a first switching circuit and a second switching circuit connected in series; the switching module includes a first M-phase bridge arm circuit, M is a positive integer, and each phase bridge arm circuit includes Series-connected upper and lower bridge arms;

The first discharge circuit includes the first battery pack, the first switching circuit, the energy storage module, and all circuits between the lower arms;

The first charging circuit and the second discharging circuit each include the second battery pack, the second switching circuit, the energy storage module, and all circuits between the upper bridge arms;

The second charging circuit includes a circuit between the first battery pack, all of the lower bridge arms, the energy storage module and the first switching circuit. The first charging and discharging circuit and the second charging and discharging circuit can realize the flow of alternating current between the at least two battery packs, realize the internal self-heating of the battery packs, achieve a wider range of rapid heating current frequencies, and realize the internal self-heating of the battery packs. Low-frequency self-heating. During low-frequency self-heating, the equivalent impedance of the battery cell is greater, so the self-heating efficiency is high, the self-heating effect is better, and the temperature rise rate is higher.

In some embodiments, a charge and discharge enable signal is sent, the switch module and the charge and discharge switching module are controlled to act, and a first charge and discharge loop is formed in the charge and discharge circuit, including:

Send a first discharge enable signal, control the first switching circuit and all the lower bridge arms to be turned on, and control the second switching circuit and all the upper bridge arms to be turned off, forming the first discharge circuit ;

Send a first charging enable signal, control the second switching circuit and all the upper bridge arms to be turned on, and control the first switching circuit and all the lower bridge arms to be turned off, forming the first charging loop .

In some embodiments, a charge and discharge enable signal is sent, the switch module and the charge and discharge switching module are controlled to act, and a second charge and discharge loop is formed in the charge and discharge circuit, including:

Send a second discharge enable signal to control all of the upper bridge arms and the second switching circuit to be turned on, and control all of the lower bridge arms and the first switching circuit to be turned off to form the second discharge loop. ;

Send a second charging enable signal, control all the lower bridge arms and the first switching circuit to be turned on, and control all the upper bridge arms and the second switching circuit to be turned off, forming the second charging loop .

After the first charging circuit completes charging the energy storage module to the second battery pack, the current on or off state of the switch module and the charge and discharge switching module is maintained to form the second discharge circuit. ;

In some embodiments, the energy storage module includes a first M-phase motor and a second M-phase motor, M is a positive integer, and the neutral point of the first M-phase motor is the same as the neutral point of the second M-phase motor. The first switching circuit includes at least one of the M upper bridge arms of the second M-phase bridge arm circuit, and the second switching circuit includes at least one of the M upper bridge arms of the second M-phase bridge arm circuit. at least one lower bridge arm among the M lower bridge arms;

Send a charge and discharge enable signal, control the switch module and the charge and discharge switching module to act, and form a first charge and discharge loop in the charge and discharge circuit, including:

Send a first discharge enable signal, control all lower bridge arms of the first switching circuit and the switch module to be conductive, and control all lower bridge arms of the second switching circuit and all upper bridge arms of the switch module. The arm is disconnected to form a circuit in which the first battery pack discharges the energy storage module;

Send a first charging enable signal to control the conduction of all upper bridge arms of the second switching circuit and the switch module, and control all upper bridge arms of the first switching circuit and all lower bridges of the switch module The arms are disconnected, forming a circuit in which the second battery pack is charged by the energy storage module.

Send a charge and discharge enable signal, control the switch module and the charge and discharge switching module to act, and form a second charge and discharge loop in the charge and discharge circuit, including:

Send a second discharge enable signal, control all upper bridge arms of the switch module and all lower bridge arms of the second switching circuit to be conductive, and control all lower bridge arms of the switch module and the first switch All upper arms of the circuit are disconnected to form the second discharge circuit;

Send a second charging enable signal, control all lower-side arms of the switch module and all upper-side arms of the first switching circuit to be conductive, and control all upper-side arms of the switch module and the second switch All lower bridge arms of the circuit are disconnected to form the second charging loop.

In some embodiments, a switch is connected between the first end of the first battery pack and the first end of the second battery pack; the second end of the second battery pack is connected to the first end of the first battery pack. The second end of the switch module, the second end of the charge and discharge switching module, and the second end of the charge and discharge switching module are connected in a common line;

Before sending the charge and discharge enable signal, the method further includes:

Control opens the switch. By controlling the switch, the connection relationship between the first battery group and the second battery group can be adjusted. After the switch is turned on, the first battery group and the second battery group can be connected in series, thereby realizing the control method of the charge and discharge circuit.

A second aspect of the embodiment of the present application provides a control device for a charge and discharge circuit. The charge and discharge circuit includes a switch module, an energy storage module, a charge and discharge switching module, and at least a first battery pack and a second battery pack;

The control device is used to send a charge and discharge enable signal, control the action of the switch module and the charge and discharge switching module, and form a first charge and discharge loop and a second charge and discharge loop that are alternately switched in the charge and discharge circuit. ;

The second charge and discharge circuit includes a second discharge circuit through which the second battery pack discharges the energy storage module and a second charging circuit through which the energy storage module charges the first battery pack. The technical solution of the second aspect can achieve the same beneficial technical effects as the technical solution of the first aspect.

A third aspect of the embodiment of the present application provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. The processor executes the program to Implement the control method of the charging and discharging circuit of the first aspect. The technical solution of the third aspect can achieve the same beneficial technical effects as the technical solution of the first aspect.

A fourth aspect of the embodiments of the present application provides a charging and discharging system, including a controller and a charging and discharging circuit. The controller is configured to execute the charging and discharging circuit control method of the first aspect for the charging and discharging circuit. The technical solution of the fourth aspect can achieve the same beneficial technical effects as the technical solution of the first aspect.

A fifth aspect of the embodiments of the present application provides a computer-readable storage medium on which a computer program is stored, and the program is executed by a processor to implement the control method of the charging and discharging circuit of the first aspect. The technical solution of the fifth aspect can achieve the same beneficial technical effects as the technical solution of the first aspect.

The technical solution provided by one aspect of the embodiments of this application may include the following beneficial effects:

The control method of the charging and discharging circuit provided by the embodiment of the present application controls the switching module and the charging and discharging switching module to form a first charging and discharging circuit and a second charging and discharging circuit that are alternately switched in the charging and discharging circuit, thereby realizing AC Current flows between the at least two battery packs to achieve internal self-heating of the battery packs, a wider range of rapid heating current frequencies, low-frequency self-heating of the battery packs, and the like of the battery cells during low-frequency self-heating. The effective impedance is larger, so the self-heating efficiency is high, the self-heating effect is better, and the temperature rise rate is higher.

Other features and advantages of the present application will be set forth in the description that follows, and, in part, from the description Some of the features and advantages may be apparent from the description, or may be inferred or unambiguously determined from the description, or may be learned by practice of the embodiments of the application.

Description of the drawings

In order to explain the embodiments of the present application or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are only These are some embodiments recorded in this application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without exerting creative efforts.

Figure 1 shows a structural block diagram of a charging and discharging circuit in some embodiments of the present application;

Figure 2 shows a circuit diagram of a charging and discharging circuit in some embodiments of the present application;

Figure 3 shows a flow chart of the control method of the charge and discharge circuit in some embodiments of the present application;

Figure 4 shows a flow chart of some embodiments of step S10 in Figure 3;

Figure 5 shows a flow chart of some embodiments of step S20 in Figure 3;

Figure 6 shows a flow chart of some other implementations of step S20 in Figure 3;

Figure 7 shows a circuit diagram of a charging and discharging circuit in some embodiments of the present application;

Figure 8 shows a circuit diagram of a charging and discharging circuit in some embodiments of the present application;

Figure 9 shows a circuit diagram of a charging and discharging circuit in some embodiments of the present application;

Figure 10 shows a structural block diagram of an electronic device according to some embodiments of the present application;

Figure 11 shows a schematic diagram of a computer-readable storage medium according to some embodiments of the present application.

The realization of the purpose, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings.

Detailed ways

The embodiments of the technical solution of the present application will be described in detail below with reference to the accompanying drawings. The following examples are only used to illustrate the technical solution of the present application more clearly, and are therefore only used as examples and cannot be used to limit the protection scope of the present application.

Unless otherwise defined, all technical and scientific terms used herein have the same meanings as commonly understood by those skilled in the technical field belonging to this application; the terms used herein are for the purpose of describing specific embodiments only and are not intended to be used in Limitation of this application; the terms "including" and "having" and any variations thereof in the description and claims of this application and the above description of the drawings are intended to cover non-exclusive inclusion.

In the description of the embodiments of this application, technical terms “first”, “second”, etc. are only used to distinguish between different objects, and cannot be understood as indicating or implying the relative importance or implicitly indicating the quantity, specific order or priority relationship of the technical features indicated. In the description of the embodiments of this application, "plurality" means two or more, unless otherwise explicitly and specifically limited.

Reference herein to "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The appearances of this phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those skilled in the art understand, both explicitly and implicitly, that the embodiments described herein may be combined with other embodiments.

In the description of the embodiments of this application, the term "and/or" is only an association relationship describing associated objects, indicating that there can be three relationships, such as A and/or B, which can mean: A exists, and A and A exist simultaneously. B, there are three situations B. In addition, the character "/" in this article generally indicates that the related objects are an "or" relationship.

In the description of the embodiments of this application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to It is more than two pieces (including two pieces).

In the description of the embodiments of this application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right" and "vertical" The orientation or positional relationships indicated by "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on those shown in the accompanying drawings. The orientation or positional relationship is only for the convenience of describing the embodiments of the present application and simplifying the description. It does 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 implementation of the present application. Example limitations.

In the description of the embodiments of this application, unless otherwise clearly stated and limited, technical terms such as "installation", "connection", "connection" and "fixing" should be understood in a broad sense. For example, it can be a fixed connection or a removable connection. It can be disassembled and connected, or integrated; it can also be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be an internal connection between two elements or an interaction between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of this application can be understood according to specific circumstances.

Power batteries have the advantages of high power, high energy density, and good environmental protection effect, and have been widely used in new energy vehicles, consumer electronics, energy storage systems and other technical fields. Power batteries can be used in, but are not limited to, vehicles, ships, aircraft and other electrical devices.

Take electric vehicles as an example. Electric vehicles powered by power batteries have the advantages of good environmental protection, low noise, low cost, and can effectively promote energy conservation and emission reduction. They have huge market application prospects and are conducive to sustainable economic development. Due to the electrochemical characteristics of power batteries, the performance of power batteries is greatly limited when the temperature is low, seriously affecting their use in low-temperature environments. Therefore, in order to use the power battery normally, the power battery needs to be heated in a low-temperature environment. The inventor found that when heating the power battery in the prior art, there is a lack of technical solutions for controlling the charge and discharge circuit of the power battery. The power battery is charged and discharged to achieve self-heating. The efficiency is low and the heating effect is poor, so it is urgent to solve these problems existing in the existing technology.

In response to the above problems, embodiments of the present application provide a method for controlling a charge and discharge circuit. By controlling the switching module and the charge and discharge switching module to operate, an alternately switched first charge and discharge circuit and a second charge and discharge circuit are formed in the charge and discharge circuit. The discharge circuit enables AC current to flow between the at least two battery packs to achieve internal self-heating of the battery packs, a wider range of fast heating current frequencies, and low-frequency self-heating of the battery packs. When low-frequency self-heating occurs, The equivalent impedance of the battery cells is larger, so the self-heating efficiency is high, the self-heating effect is better, and the temperature rise rate is higher.

As shown in Figure 1, in some embodiments, the charge and discharge circuit includes a power supply module 1, a switch module 2, an energy storage module 3 and a charge and discharge switching module 4. The power supply module 1 includes at least a first battery group 11 and a second battery. Group 12. According to the needs of actual applications, the power supply module 1 can include multiple battery packs, and the specific number can be set according to actual needs.

Specifically, the control method of the charge and discharge circuit may include:

Send the charge and discharge enable signal, control the switch module 2 and the charge and discharge switching module 4 to operate, and form a first charge and discharge circuit and a second charge and discharge circuit that are alternately switched in the charge and discharge circuit;

The first charging and discharging circuit includes a first discharging circuit in which the first battery pack 11 discharges the energy storage module 3 and a first charging circuit in which the energy storage module 3 charges the second battery pack 12;

The second charging and discharging circuit includes a second discharging circuit in which the second battery pack 12 discharges the energy storage module 3 and a second charging circuit in which the energy storage module 3 charges the first battery pack 11 .

By controlling the operation of the switch module 2 and the charge and discharge switching module 4, an alternately switched first charge and discharge circuit and a second charge and discharge circuit are formed in the charge and discharge circuit, thereby realizing the flow of alternating current between the at least two battery groups. , to achieve internal self-heating of the battery pack, a wider range of fast heating current frequencies can be achieved, and low-frequency self-heating of the battery pack can be achieved. During low-frequency self-heating, the equivalent impedance of the battery pack cells is greater, so the self-heating efficiency is high. The self-heating effect is better and the temperature rise rate is higher.

In some embodiments, sending the charge and discharge enable signal and controlling the switch module 2 and the charge and discharge switching module 4 to perform actions may include: alternately sending the first charge and discharge enable signal and the second charge and discharge enable signal according to a preset frequency. , control the switch module 2 and the charge and discharge switching module 4 to operate. By controlling the switching module 2 and the charge-discharge switching module 4 to operate according to a preset frequency, a first charge-discharge circuit and a second charge-discharge circuit are alternately switched, and the frequency of the AC current generated in the entire charge-discharge circuit can be adjusted, thereby improving The rate at which the battery pack is heated.

In some embodiments, the first discharge circuit maintenance time is equal to the first charging circuit maintenance time, and the second discharge circuit maintenance time is equal to the second charging circuit maintenance time, thereby ensuring that the energy storage module 3 can discharge the energy every time. The electric energy stored in the energy storage module 3 is completely charged into the corresponding battery pack.

As shown in Figure 2, in some embodiments, the charge and discharge switching module 4 includes a first switching circuit 401 and a second switching circuit 402 connected in series; the switching module 2 includes a first M-phase bridge arm circuit, M is a positive integer, each The one-phase bridge arm circuit includes an upper bridge arm and a lower bridge arm connected in series; M in the circuit shown in Figure 2 is 3, that is, the first M-phase bridge arm circuit is a three-phase bridge arm circuit; the first discharge circuit includes the first battery pack 11. The first switching circuit 401, the energy storage module 3 and the circuits between all lower bridge arms; the first charging circuit and the second discharging circuit both include the second battery pack 12, the second switching circuit 402, the energy storage module 3 and The circuit between all upper bridge arms; the second charging circuit includes the circuit between the first battery pack, all lower bridge arms, the energy storage module 3 and the first switching circuit 401 . Each battery pack may be a collection of multiple battery modules or a battery module including multiple cells. The first charging and discharging circuit and the second charging and discharging circuit can realize the flow of alternating current between the at least two battery packs, realize the internal self-heating of the battery packs, achieve a wider range of rapid heating current frequencies, and realize the internal self-heating of the battery packs. Low-frequency self-heating. During low-frequency self-heating, the equivalent impedance of the battery cell is greater, so the self-heating efficiency is high, the self-heating effect is better, and the temperature rise rate is higher.

The switch module 2 can be implemented by an inverter and includes M-phase bridge arms, where M is a positive integer; each phase bridge arm includes an upper bridge arm and a lower bridge arm. For example, the M-phase bridge arm includes M upper bridge arms and M lower bridge arms, and the M upper bridge arms and M lower bridge arms are connected in a one-to-one correspondence. The energy storage module 3 may include an M-phase motor, and the M-phase motor may be an M-phase winding motor with M-phase windings.

Specifically, the M-phase bridge arm of the switch module 2 can be a three-phase bridge arm, including bridge arm 21, bridge arm 22 and bridge arm 23; corresponding to the switch module 2, the M-phase motor is a three-phase winding motor, including three-phase The windings are respectively winding A1, winding B1 and winding C1. The bridge arm 21 includes an upper bridge arm 211 and a lower bridge arm 212 connected in series. The upper bridge arm 211 includes a parallel triode V1 and a freewheeling diode D1. The lower bridge arm 212 includes a parallel connected triode V4 and a freewheeling diode D4. The bridge arm 22 includes The upper bridge arm 221 and the lower bridge arm 222 are connected in series. The upper bridge arm 221 includes a parallel triode V2 and a freewheeling diode D2. The lower bridge arm 222 includes a parallel connected triode V5 and a freewheeling diode D5. The bridge arm 23 includes a series connected upper bridge. The upper bridge arm 231 includes a parallel transistor V3 and a freewheeling diode D3, and the lower bridge arm 232 includes a parallel transistor V6 and a freewheeling diode D6.

In this example, the charge and discharge switching module 4 includes a first switching circuit 401 and a second switching circuit 402 connected in series. The structures of the first switching circuit 401 and the second switching circuit 402 may be parallel transistors and freewheeling diodes, or may only include switches. As shown in FIG. 2 , the first switching circuit 401 has a structure of a parallel transistor V7 and a freewheeling diode D7, and the second switching circuit 402 has a parallel structure of a transistor V8 and a freewheeling diode D8.

As shown in Figure 2, the second battery pack 12 is connected in parallel with the M-phase bridge arm included in the switch module 2, wherein the first end of the second battery pack 12 and the upper bridge arm of the M-phase bridge arm are connected in line; the M-phase bridge The upper and lower bridge arm connection points of the arm are respectively connected to the M-phase windings of the M-phase motor in a one-to-one correspondence; the upper and lower bridge arm connection points of the charge and discharge switching module 4 are connected to the neutral point of the M-phase motor.

The upper and lower bridge arm connection points of the charge and discharge switching module 4 can be directly connected to the neutral point of the M-phase motor through wires, or they can be connected between the upper and lower bridge arm connection points of the charge and discharge switching module 4 and the neutral point of the M phase motor. The second energy storage element may include at least one inductor L1, or may include an inductor and a capacitor connected in series. In some examples, the inductance of the inductor L1 is adapted to the charging and discharging performance and rapid heating conditions requirements of the power supply module, and its minimum inductance is 0H (that is, equivalent to a DC wire).

The first end of the first battery pack 11 is collinearly connected to the first switching circuit 401 of the charge and discharge switching module 4; The second end of the first battery pack 11 is connected in a common line with the second end of the second battery pack 12 , the M-phase bridge arm, and the second switching circuit 402 of the charge and discharge switching module 4 .

For the circuit shown in Figure 2, in the control method of this embodiment, as shown in Figure 3, a charge and discharge enable signal is sent, and the switch module 2 and the charge and discharge switching module 4 are controlled to act, forming a state in the charge and discharge circuit. The alternately switching of the first charging and discharging circuit and the second charging and discharging circuit includes step S10 and step S20:

S10. Send a charge and discharge enable signal, control the switch module 2 and the charge and discharge switching module 4 to operate, and form a first charge and discharge circuit in the charge and discharge circuit.

As shown in Figure 4, in some implementations, step S10 includes S101 and S102:

S101. Send a first discharge enable signal, control the first switching circuit 401 and all lower bridge arms to be turned on, and control the second switching circuit 402 and all upper bridge arms to be turned off, forming a first discharge loop.

Specifically, the first discharge enable signal is sent, the first switching circuit 401 and the lower arm 212, the lower arm 222 and the lower arm 232 are controlled to be conductive, and the second switching circuit 402 and the upper arm 211 and the upper arm are controlled to be conductive. The arm 221 and the upper arm 231 are disconnected to form a first discharge circuit.

The current direction of the first discharge circuit is: the positive electrode of the first battery pack 11 → the first switching circuit 401 → the energy storage module 3 → the lower bridge arm 212, the lower bridge arm 222 and the lower bridge arm 232 → the negative electrode of the first battery pack 11 . At least part of the electrical energy of the first battery pack 11 is stored in the energy storage module 3 through the first discharge circuit.

S102. Send a first charging enable signal, control the second switching circuit 402 and all upper bridge arms to be turned on, and control the first switching circuit 401 and all lower bridge arms to be turned off to form a first charging loop.

Specifically, the first charging enable signal is sent, the second switching circuit 402 and the upper bridge arm 211, the upper bridge arm 221 and the upper bridge arm 231 are controlled to be conductive, and the first switching circuit 401, the lower bridge arm 212 and the lower bridge arm are controlled to be conductive. The arm 222 and the lower arm 232 are disconnected to form a first charging circuit.

The current direction of the first charging circuit is: the negative electrode of the second battery pack 12 → the second switching circuit 402 → the energy storage module 3 → the upper bridge arm 211, the upper bridge arm 221 and the upper bridge arm 231 → the positive electrode of the second battery pack 12 . The electric energy stored in the energy storage module 3 is charged into the second battery pack 12 through the first charging circuit.

S20. Send the charge and discharge enable signal, control the switch module 2 and the charge and discharge switching module 4 to operate, and form a second charge and discharge circuit in the charge and discharge circuit.

As shown in Figure 5, in some implementations, step S20 includes S201 and S202:

S201. Send a second discharge enable signal, control all upper arms and the second switching circuit 402 to be turned on, and control all lower arms and the first switching circuit 401 to be turned off, forming a second discharge loop.

The current direction of the second discharge circuit is: the positive electrode of the second battery pack 12 → the upper bridge arm 211 , the upper bridge arm 221 and the upper bridge arm 231 → the energy storage module 3 → the second switching circuit 402 → the negative electrode of the second battery pack 12 . At least part of the electrical energy of the second battery pack 12 is stored in the energy storage module 3 through the second discharge circuit.

S202. Send a second charging enable signal to control all lower bridge arms and the first switching circuit 401 to conduct is turned on, and controls all upper-side arms and the second switching circuit 402 to be turned off to form a second charging loop.

The current direction of the second charging circuit is: the negative electrode of the first battery pack 11 → the lower bridge arm 212, the lower bridge arm 222 and the lower bridge arm 232 → the energy storage module 3 → the first switching circuit 401 → the positive electrode of the first battery pack 11 . The electric energy stored in the energy storage module 3 is charged into the first battery pack 11 through the second charging circuit.

As shown in Figure 6, in other embodiments, step S20 includes S20-1 and S20-2:

S20-1. After the first charging circuit completes charging the energy storage module 3 to the second battery pack 12, maintain the current on or off state of the switch module 2 and the charge and discharge switching module 4 to form a second discharge circuit.

Specifically, the current direction of the second discharge circuit is: the positive electrode of the second battery pack 12 → the upper arm 211 , the upper arm 221 and the upper arm 231 → the energy storage module 3 → the second switching circuit 402 → the second battery pack The negative pole of 12. At least part of the electrical energy of the second battery pack 12 is stored in the energy storage module 3 through the second discharge circuit.

S20-2. Send a second charging enable signal, control all lower-side arms and the first switching circuit 401 to be turned on, and control all upper-side arms and the second switching circuit 402 to be turned off, forming a second charging loop.

Specifically, the current direction of the second charging circuit is: the negative electrode of the first battery pack 11 → the lower bridge arm 212, the lower bridge arm 222 and the lower bridge arm 232 → the energy storage module 3 → the first switching circuit 401 → the first battery pack The positive terminal of 11. The electric energy stored in the energy storage module 3 is charged into the first battery pack 11 through the second charging circuit.

As shown in Figure 7, in some embodiments, the energy storage module 3 includes a first M-phase motor and a second M-phase motor, M is a positive integer, and the neutral point of the first M-phase motor is equal to the neutral point of the second M-phase motor. The neutral point is connected; the first switching circuit includes at least one upper bridge arm among the M upper bridge arms of the second M-phase bridge arm circuit. In this embodiment, the first switching circuit includes an upper bridge arm of the second M-phase bridge arm circuit. M upper bridge arms are described as an example; the second switching circuit includes at least one lower bridge arm among the M lower bridge arms of the second M-phase bridge arm circuit. In this embodiment, the second switching circuit includes a second M-phase bridge arm. The M lower bridge arms of the bridge arm circuit are described as an example; Figure 7 shows the circuit structure of the charge and discharge circuit that uses dual motors to heat dual battery packs, that is, the circuit topology when the M motors are dual motors.

Specifically, as shown in FIG. 7 , the M-phase winding connection point of the first M-phase motor is connected to the M-phase winding connection point of the second M-phase motor. The first M-phase motor and the second M-phase motor may both be three-phase winding motors. The first M-phase motor includes winding A1, winding B1 and winding C1; the second M-phase motor includes winding A'1, winding B'1 and Winding C'1. The common connection point of windings A1, B1 and C1 is connected to the common connection point of windings A’1, B’1 and C’1.

The upper and lower bridge arm connection points of the M-phase bridge arm included in the switch module 2 are respectively connected to the M-phase winding of the first M-phase motor in a one-to-one correspondence. Specifically, the M-phase bridge arm in the switch module 2 includes a bridge arm 21 , a bridge arm 22 and a bridge arm 23 . The connection point of the upper bridge arm 211 and the lower bridge arm 212 of the bridge arm 21 is connected to one end of the winding A1, the connection point of the upper bridge arm 221 and the lower bridge arm 222 of the bridge arm 22 is connected to one end of the winding B1, and the connection point of the bridge arm 23 The connection point between the upper arm 231 and the lower arm 232 is connected to one end of the winding C1.

The charge and discharge switching module 4 also includes an M-phase bridge arm, and the upper and lower bridge arm connection points of the M-phase bridge arm are respectively connected to the M-phase winding of the second M-phase motor in a one-to-one correspondence. Specifically, the charge and discharge switching module 4 includes a bridge arm 41, Bridge arm 42 and bridge arm 43 . The connection point of the upper bridge arm 411 and the lower bridge arm 412 of the bridge arm 41 is connected to one end of the winding A'1, and the connection point of the upper bridge arm 421 and the lower bridge arm 422 of the bridge arm 42 is connected to one end of the winding B'1. The connection point of the upper bridge arm 431 and the lower bridge arm 432 of the bridge arm 43 is connected to one end of the winding C'1, the other end of the winding A'1, the other end of the winding B'1, the other end of the winding C'1, the winding The other end of A1, the other end of winding B1 and the other end of winding C1 are connected to a common connection point.

Step S10 includes S10-1 and S10-2:

S10-1. Send a first discharge enable signal, control all lower bridge arms of the first switching circuit and switch module 2 to be turned on, and control all lower bridge arms of the second switching circuit and all upper bridge arms of switch module 2 to be off. Open, forming a circuit in which the first battery pack 11 discharges the energy storage module 3 .

Specifically, the current direction in the circuit in which the first battery pack 11 discharges the energy storage module 3 is: the current direction in the first discharge circuit is: the positive electrode of the first battery pack 11 → the upper bridge arm 411, the upper bridge arm 421 and the upper bridge arm 411. Bridge arm 431 → energy storage module 3 → lower bridge arm 212, lower bridge arm 222 and lower bridge arm 232 → negative electrode of the first battery pack 11. At least part of the electrical energy of the first battery pack 11 is stored in the energy storage module 3 through the first discharge circuit.

S10-2. Send the first charging enable signal, control all the upper bridge arms of the second switching circuit and the switch module 2 to be turned on, and control all the upper bridge arms of the first switching circuit and all the lower bridge arms of the switch module 2 to be off. Open, forming a circuit in which the second battery pack 12 is charged by the energy storage module 3.

Specifically, the current direction in the circuit in which the second battery pack 12 is charged by the energy storage module 3 is: the negative electrode of the second battery pack 12 → the lower bridge arm 412, the lower bridge arm 422 and the lower bridge arm 432 → the energy storage module 3 → The upper arm 211 , the upper arm 221 and the upper arm 231 → the positive electrode of the second battery pack 12 . The electric energy stored in the energy storage module 3 is charged into the second battery pack 12 through the first charging circuit.

In some embodiments, step S20 includes S20(1) and S20(2):

S20(1). Send the second discharge enable signal, control all the upper arms of the switch module 2 and all the lower arms of the second switching circuit to be conductive, and control all the lower arms of the switch module 2 and the first switching circuit. All upper-side arms are disconnected to form a second discharge loop.

Specifically, the current direction of the second discharge circuit is: the positive electrode of the second battery pack 12 → the upper bridge arm 211 , the upper bridge arm 221 and the upper bridge arm 231 → the energy storage module 3 → the lower bridge arm 412, the lower bridge arm 422 and Lower arm 432 → the negative electrode of the second battery pack 12 . At least part of the electrical energy of the second battery pack 12 is stored in the energy storage module 3 through the second discharge circuit.

S20(2). Send the second charging enable signal, control all the lower arms of the switch module 2 and all the upper arms of the first switching circuit to be turned on, and control all the upper arms of the switch module 2 and the second switching circuit. All lower bridge arms are disconnected to form a second charging loop.

The current direction of the second charging circuit is: the negative electrode of the first battery pack 11 → the lower bridge arm 212, the lower bridge arm 222 and the lower bridge arm 232 → the energy storage module 3 → the upper bridge arm 411, the upper bridge arm 421 and the upper bridge arm 431 → the positive electrode of the first battery pack 11 . The electric energy stored in the energy storage module 3 is charged into the first battery pack 11 through the second charging circuit.

In the embodiment of FIG. 7 , by controlling the currents flowing into the windings A1 to C1 to be equal in size and phase, the vibration noise of the first motor can be effectively suppressed during the process of heating the power battery using the motor circuit. Similarly, by controlling the currents flowing out of the windings A'1 to C'1 to be equal in magnitude and phase, the vibration noise of the second motor can be effectively suppressed during the process of using the motor circuit to heat the power battery. At the same time, the motor does not run, which can also solve the problem of heating of the rotor in the motor, thereby extending the self-heating life of the battery.

As shown in Figures 8 and 9, in some embodiments, a first switch K1 is connected between the first end of the first battery pack 11 and the first end of the second battery pack 12; The two ends are connected in line with the second end of the first battery pack 11, the second end of the switch module 2, and the second end of the charge and discharge switching module 4; the first battery pack 11 and the second battery pack 12 are connected with a third end. A switch K1 (the first switch K1 is not shown in Figure 1, the dotted line in the power supply module 1 in Figure 1 indicates that the connection relationship is variable), the first switch K1 is provided between the first end of the second battery pack 12 and the first battery Between the first ends of the battery pack 11; the opening and closing state of the first switch K1 can change the connection relationship between the first battery pack 11 and the second battery pack 12. Specifically, when the first switch K1 is closed, the first battery group 11 and the second battery group 12 are connected in parallel; when the first switch K1 is open, the first battery group 11 and the second battery group 12 are connected in series. A second switch K2 can also be provided between the upper and lower bridge arm connection points of the charge and discharge switching module 4 and the neutral point of the M-phase motor.

Specifically, before the charge and discharge enable signal is sent, the switch module 2 and the charge and discharge switching module 4 are controlled to operate, and the first charge and discharge circuit and the second charge and discharge circuit that are alternately switched are formed in the charge and discharge circuit, the method also includes: It includes: controlling to open the first switch K1 so that the first battery pack 11 and the second battery pack 12 are connected in series.

When the motor needs to be used to heat the two battery packs, the first switch K1 is turned off. At this time, the first battery pack 11 and the second battery pack 12 are connected in series. By controlling the upper bridge arm or the lower bridge arm of the M-phase bridge arm, and the first upper bridge arm 401 and the first lower bridge arm 402 of the charge and discharge switching module 4, the switching of the first battery pack 11 and the second battery pack 12 can be realized. Charge and discharge control.

In some embodiments, before executing the control method of this embodiment, the battery management system BMS collects battery pack data, including but not limited to temperature, SOC, voltage, current, etc., to determine whether the battery pack is normal and whether the battery pack meets the self-heating requirements. (rapid heating) conditions; if the conditions are met, BMS sends a heating request to VCU; MCU (Motor control unit) motor controller collects motor data, including but not limited to voltage, current, temperature and other data, to determine whether the motor is in a static state and Whether the heating conditions are met; when the VCU needs it, the MCU sends the self-test status to the VCU; the vehicle controller VCU (Vehicle control unit) determines whether the pulse heating device is turned on based on the heating request sent by the BMS and the motor working status sent by the MCU to perform battery testing. Heating; if the conditions are met, the VCU issues a quick heat start command; after the controller receives the self-heating start command or determines that the vehicle can start self-heating, the control switch K1 is opened, the switch K2 is closed, and then the controller starts to execute this embodiment control method. After executing the control method of this embodiment, the BMS determines whether the parameters of the battery pack are normal. If there are abnormalities, it sends abnormal information to the vehicle controller. The vehicle controller forwards the abnormal information to the pulse heating device controller, and the pulse heating device Stop working and switch the two battery packs to parallel connection.

In this embodiment, the transistor can be an Insulated Gate Bipolar Transistor (IGBT), or a Metal-Oxide Semiconductor Field Effect Transistor (MOS). The use of other electronic components with switching functions is not limited here.

In this embodiment, the design of a multi-battery pack can effectively reduce the constraints of the motor inductance on the size and frequency of the heating current. Through the dual-battery heating method, the energy of the energy storage module 3 can be discharged into it in a timely manner. In a battery, the heating current of the battery can be maintained at a stable heating current according to the preset heating frequency. The charging and discharging circuit can generate AC current, so that the battery can adjust the heating current frequency under different temperatures and SOC states. Adjustment allows the heating rate to be greatly increased.

The execution subject of the control method of the charge and discharge circuit in the embodiment of the present application can be a controller, and the controller can be composed of a BMS vehicle MCU. The BMS is responsible for status monitoring and switch control on the power supply module side, and the MCU is responsible for status monitoring and switch control on the motor side. , the controller can also be a vehicle domain controller.

Another embodiment of the present application provides a control device for a charge and discharge circuit. The charge and discharge circuit includes a switch module 2, an energy storage module 3, a charge and discharge switching module 4, and at least a first battery group 11 and a second battery group 12;

The control device is used to send a charge and discharge enable signal, control the switch module 2 and the charge and discharge switching module 4 to operate, and form a first charge and discharge circuit and a second charge and discharge circuit that are alternately switched in the charge and discharge circuit;

The first charging and discharging circuit includes a first discharging circuit in which the first battery pack discharges the energy storage module 3 and a first charging circuit in which the energy storage module 3 charges the second battery pack;

The second charging and discharging circuit includes a second discharging circuit in which the second battery pack discharges the energy storage module 3 and a second charging circuit in which the energy storage module 3 charges the first battery pack.

In some embodiments, the control device sends a charge and discharge enable signal to control the switch module and the charge and discharge switching module to perform actions, including:

The first charge and discharge enable signal and the second charge and discharge enable signal are alternately sent according to the preset frequency, and the switch module and the charge and discharge switching module are controlled to act.

In some embodiments, the first discharge circuit maintenance time is equal to the first charging circuit maintenance time; the second discharge circuit maintenance time is equal to the second charging circuit maintenance time.

In some embodiments, the charge and discharge switching module includes a first switching circuit and a second switching circuit connected in series; the switching module includes a first M-phase bridge arm circuit, M is a positive integer, and each phase bridge arm circuit includes a series-connected upper Bridge arms and lower bridge arms;

The first discharge circuit includes the first battery pack, the first switching circuit, the energy storage module and the circuit between all lower bridge arms;

The first charging circuit and the second discharging circuit both include the second battery pack, the second switching circuit, the energy storage module and the circuits between all upper bridge arms;

The second charging circuit includes a circuit between the first battery pack, all lower bridge arms, the energy storage module and the first switching circuit.

In some embodiments, the control device sends a charge and discharge enable signal, controls the switch module and the charge and discharge switching module to act, and forms a first charge and discharge loop in the charge and discharge circuit, including:

Send a first discharge enable signal to control the first switching circuit and all lower bridge arms to be turned on, and control the second switching circuit and all upper bridge arms to be disconnected to form a first discharge circuit;

A first charging enable signal is sent to control the second switching circuit and all upper bridge arms to be turned on, and to control the first switching circuit and all lower bridge arms to be turned off to form a first charging loop.

In some embodiments, the control device sends a charge and discharge enable signal, controls the switch module and the charge and discharge switching module to act, and forms a second charge and discharge loop in the charge and discharge circuit, including:

Send a second discharge enable signal to control all upper bridge arms and the second switching circuit to be turned on, and control all lower bridge arms and the first switching circuit to be turned off to form a second discharge circuit;

The second charging enable signal is sent to control all the lower-side arms and the first switching circuit to be turned on, and to control all the upper-side arms and the second switching circuit to be turned off to form a second charging loop.

After the first charging circuit completes charging the energy storage module to the second battery pack, the current on or off state of the switch module and the charge and discharge switching module is maintained to form a second discharge circuit;

In some embodiments, the energy storage module includes a first M-phase motor and a second M-phase motor, M is a positive integer, and the neutral point of the first M-phase motor is connected to the neutral point of the second M-phase motor; The first switching circuit includes at least one upper bridge arm among the M upper bridge arms of the second M-phase bridge arm circuit, and the second switching circuit includes at least one lower bridge among the M lower bridge arms of the second M-phase bridge arm circuit. arm;

The control device sends the charge and discharge enable signal, controls the switch module and the charge and discharge switching module to act, and forms a first charge and discharge loop in the charge and discharge circuit, including:

Send a first discharge enable signal, control all the lower bridge arms of the first switching circuit and the switch module to be turned on, and control all the lower bridge arms of the second switching circuit and all the upper bridge arms of the switch module to be turned off to form the first battery Set up a circuit for discharging the energy storage module;

Send a first charging enable signal, control all the upper bridge arms of the second switching circuit and the switch module to be turned on, and control all the upper bridge arms of the first switching circuit and all the lower bridge arms of the switch module to be turned off to form a second battery A group of circuits charged by energy storage modules.

In some embodiments, the energy storage module includes a first M-phase motor and a second M-phase motor, M is a positive integer, and the neutral point of the first M-phase motor is connected to the neutral point of the second M-phase motor; The first switching circuit includes at least one of the M upper bridge arms of the second M-phase bridge arm circuit, and the second switching circuit includes a second M-phase bridge At least one lower bridge arm among the M lower bridge arms of the arm circuit;

The control device sends the charge and discharge enable signal, controls the switch module and the charge and discharge switching module to act, and forms a second charge and discharge loop in the charge and discharge circuit, including:

Send a second discharge enable signal, control all upper-side arms of the switch module and all lower-side arms of the second switching circuit to be turned on, and control all lower-side arms of the switch module and all upper-side arms of the first switching circuit to be turned off , forming a second discharge circuit;

Send a second charging enable signal to control all the lower bridge arms of the switch module and all the upper bridge arms of the first switching circuit to be turned on, and control all the upper bridge arms of the switch module and all the lower bridge arms of the second switching circuit to be turned off , forming a second charging loop.

In some embodiments, a switch is connected between the first end of the first battery pack and the first end of the second battery pack; the second end of the second battery pack, the second end of the first battery pack, and the switch module The second end of the charge and discharge switching module is connected in a common line;

Before the control device executes sending the charge and discharge enable signal, sending the charge and discharge enable signal, and controlling the switch module and the charge and discharge switching module to take action, the control device also executes: controlling the opening of the switch.

Another embodiment of the present application provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. The processor executes the program to implement any of the above embodiments. Control method of discharge circuit.

As shown in Figure 10, the electronic device 10 may include: a processor 100, a memory 101, a bus 102 and a communication interface 103. The processor 100, the communication interface 103 and the memory 101 are connected through the bus 102; the memory 101 stores information available in the processor. A computer program running on the computer 100. When the processor 100 runs the computer program, the method provided by any of the foregoing embodiments of the application is executed.

Among them, the memory 101 may include high-speed random access memory (RAM: Random Access Memory), or may also include non-volatile memory (non-volatile memory), such as at least one disk memory. The communication connection between the system network element and at least one other network element is realized through at least one communication interface 103 (which can be wired or wireless), and the Internet, wide area network, local network, metropolitan area network, etc. can be used.

The bus 102 may be an ISA bus, a PCI bus, an EISA bus, etc. The bus can be divided into address bus, data bus, control bus, etc. The memory 101 is used to store a program, and the processor 100 executes the program after receiving the execution instruction. The method disclosed in any of the embodiments of the present application can be applied to the processor 100 or implemented by the processor 100 .

The processor 100 may be an integrated circuit chip with signal processing capabilities. During the implementation process, each step of the above method can be completed by instructions in the form of hardware integrated logic circuits or software in the processor 100 . The above-mentioned processor 100 can be a general-purpose processor, which can include a central processing unit (Central Processing Unit, CPU for short), a network processor (Network Processor, NP for short), etc.; it can also be a digital signal processor (DSP), a dedicated integrated processor circuit (ASIC), off-the-shelf programmable gate array (FPGA) or other programmable Logic devices, discrete gate or transistor logic devices, discrete hardware components. Each method, step and logical block diagram disclosed in the embodiment of this application can be implemented or executed. A general-purpose processor may be a microprocessor or the processor may be any conventional processor, etc. The steps of the method disclosed in conjunction with the embodiments of the present application can be directly implemented by a hardware decoding processor, or executed by a combination of hardware and software modules in the decoding processor. The software module can be located in random access memory, flash memory, read-only memory, programmable read-only memory or electrically erasable programmable memory, registers and other mature storage media in this field. The storage medium is located in the memory 101. The processor 100 reads the information in the memory 101 and completes the steps of the above method in combination with its hardware.

The electronic device provided by the embodiments of the present application and the method provided by the embodiments of the present application are based on the same inventive concept, and have the same beneficial effects as the methods adopted, run or implemented.

Another embodiment of the present application provides a charging and discharging system, including a controller and a charging and discharging circuit. The controller is configured to execute the control method of the charging and discharging circuit in any of the above embodiments for the charging and discharging circuit.

Another embodiment of the present application provides a computer-readable storage medium on which a computer program is stored, and the program is executed by a processor to implement the control method of the charge and discharge circuit in any of the above embodiments.

Referring to Figure 11, the computer-readable storage medium shown is an optical disk 20, on which a computer program (ie, a program product) is stored. When the computer program is run by a processor, it will execute any of the foregoing embodiments. method.

It should be noted that examples of computer-readable storage media may also include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), and other types of random access memory. Memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other optical and magnetic storage media will not be described in detail here.

The computer-readable storage medium provided by the above embodiments of the present application is based on the same inventive concept as the method provided by the embodiments of the present application, and has the same beneficial effects as the methods adopted, run or implemented by the application programs stored therein.

It should be noted:

The term "module" is not intended to be limited to a particular physical form. Depending on the specific application, modules may be implemented as hardware, firmware, software, and/or a combination thereof. Furthermore, different modules can share common components or even be implemented by the same components. There may or may not be clear boundaries between different modules.

The algorithms and displays provided herein are not inherently associated with any particular computer, virtual appliance, or other device. Various general-purpose devices may also be used with examples based here. The structure required to construct such a device will be apparent from the above description. Furthermore, this application is not specific to any specific programming language. It should be understood that the subject matter described herein may be implemented using a variety of programming languages, and that the above descriptions of specific languages are for the purpose of disclosing the best mode for carrying out the subject matter.

It should be understood that although various steps in the flowchart of the accompanying drawings are shown in sequence as indicated by arrows, these steps are not necessarily performed in the order indicated by arrows. Unless explicitly stated in this article, There is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some of the steps in the flow chart of the accompanying drawings may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily executed at the same time, but may be executed at different times, and their execution order is also It does not necessarily need to be performed sequentially, but may be performed in turn or alternately with other steps or sub-steps of other steps or at least part of the stages.

The above-described embodiments only express the implementation of the present application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the patent scope of the present application. It should be noted that, for those of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all fall within the protection scope of the present application. Therefore, the scope of protection of this application should be determined by the appended claims.

Claims

A control method for a charge and discharge circuit, characterized in that the charge and discharge circuit includes a switch module, an energy storage module, a charge and discharge switching module and at least a first battery pack and a second battery pack; the method includes:

Send a charge and discharge enable signal, control the switch module and the charge and discharge switching module to act, and form a first charge and discharge circuit and a second charge and discharge circuit that are alternately switched in the charge and discharge circuit;

The first charge and discharge circuit includes a first discharge circuit through which the first battery pack discharges the energy storage module and a first charging circuit through which the energy storage module charges the second battery pack;

The second charge and discharge circuit includes a second discharge circuit through which the second battery pack discharges the energy storage module and a second charging circuit through which the energy storage module charges the first battery pack.
The method according to claim 1, characterized in that said sending a charging and discharging enable signal and controlling the switching module and the charging and discharging switching module to act includes:

The first charge and discharge enable signal and the second charge and discharge enable signal are alternately sent according to a preset frequency, and the switch module and the charge and discharge switching module are controlled to operate.
The method according to claim 1, wherein the maintenance time of the first discharge circuit is equal to the maintenance time of the first charging circuit; the maintenance time of the second discharge circuit is equal to the maintenance time of the second charging circuit. .
The method according to claim 1, characterized in that the charge and discharge switching module includes a first switching circuit and a second switching circuit connected in series; the switching module includes a first M-phase bridge arm circuit, M is a positive integer, Each phase bridge arm circuit includes an upper bridge arm and a lower bridge arm connected in series;

The first discharge circuit includes the first battery pack, the first switching circuit, the energy storage module, and all circuits between the lower arms;

The first charging circuit and the second discharging circuit each include the second battery pack, the second switching circuit, the energy storage module, and all circuits between the upper bridge arms;

The second charging circuit includes a circuit between the first battery pack, all of the lower bridge arms, the energy storage module and the first switching circuit.
The method according to claim 4, characterized in that: sending a charging and discharging enable signal, controlling the switching module and the charging and discharging switching module to operate, and forming a first charging and discharging loop in the charging and discharging circuit, including :

Send a first discharge enable signal, control the first switching circuit and all the lower bridge arms to be turned on, and control the second switching circuit and all the upper bridge arms to be turned off, forming the first discharge circuit ;

Send a first charging enable signal, control the second switching circuit and all the upper bridge arms to be turned on, and control the first switching circuit and all the lower bridge arms to be turned off, forming the first charging loop .
The method according to claim 4 or 5, characterized by sending a charge and discharge enable signal, controlling the switch module and the charge and discharge switching module to operate, and forming a second charge and discharge loop in the charge and discharge circuit. ,include:

Send a second discharge enable signal to control all of the upper bridge arms and the second switching circuit to be turned on, and control all of the lower bridge arms and the first switching circuit to be turned off to form the second discharge loop. ;

Send a second charging enable signal, control all the lower bridge arms and the first switching circuit to be turned on, and control all the upper bridge arms and the second switching circuit to be turned off, forming the second charging loop .
The method according to claim 4 or 5, characterized by sending a charge and discharge enable signal, controlling the switch module and the charge and discharge switching module to operate, and forming a second charge and discharge loop in the charge and discharge circuit. ,include:

After the first charging circuit completes charging the energy storage module to the second battery pack, the current on or off state of the switch module and the charge and discharge switching module is maintained to form the second discharge circuit. ;

Send a second charging enable signal, control all the lower bridge arms and the first switching circuit to be turned on, and control all the upper bridge arms and the second switching circuit to be turned off, forming the second charging loop .
The method of claim 4, wherein the energy storage module includes a first M-phase motor and a second M-phase motor, M is a positive integer, and the neutral point of the first M-phase motor is equal to the neutral point of the first M-phase motor. The neutral point of the second M-phase motor is connected; the first switching circuit includes at least one upper bridge arm among the M upper bridge arms of the second M-phase bridge arm circuit, and the second switching circuit includes the third upper bridge arm. At least one lower bridge arm among the M lower bridge arms of the two M-phase bridge arm circuit;

Send a charge and discharge enable signal, control the switch module and the charge and discharge switching module to act, and form a first charge and discharge loop in the charge and discharge circuit, including:

Send a first discharge enable signal, control all lower bridge arms of the first switching circuit and the switch module to be conductive, and control all lower bridge arms of the second switching circuit and all upper bridge arms of the switch module. The arm is disconnected to form a circuit in which the first battery pack discharges the energy storage module;

Send a first charging enable signal to control the conduction of all upper bridge arms of the second switching circuit and the switch module, and control all upper bridge arms of the first switching circuit and all lower bridges of the switch module The arms are disconnected, forming a circuit in which the second battery pack is charged by the energy storage module.
The method of claim 4, wherein the energy storage module includes a first M-phase motor and a second M-phase motor, M is a positive integer, and the neutral point of the first M-phase motor is equal to the neutral point of the first M-phase motor. The neutral point of the second M-phase motor is connected; the first switching circuit includes at least one upper bridge arm among the M upper bridge arms of the second M-phase bridge arm circuit, and the second switching circuit includes the third upper bridge arm. At least one lower bridge arm among the M lower bridge arms of the two M-phase bridge arm circuit;

Send a charge and discharge enable signal, control the switch module and the charge and discharge switching module to act, and form a second charge and discharge loop in the charge and discharge circuit, including:

Send a second discharge enable signal, control all upper bridge arms of the switch module and all lower bridge arms of the second switching circuit to be conductive, and control all lower bridge arms of the switch module and the first switch All upper arms of the circuit are disconnected to form the second discharge circuit;

Send a second charging enable signal, control all lower-side arms of the switch module and all upper-side arms of the first switching circuit to be conductive, and control all upper-side arms of the switch module and the second switch All lower bridge arms of the circuit are disconnected to form the second charging loop.
The method according to any one of claims 1 to 9, characterized in that a switch is connected between the first end of the first battery pack and the first end of the second battery pack; the second The second end of the battery pack is collinearly connected to the second end of the first battery pack, the second end of the switch module, and the second end of the charge and discharge switching module;

Before sending the charge and discharge enable signal and controlling the switch module and the charge and discharge switching module to act, the method further includes:

Control opens the switch.
A control device for a charge and discharge circuit, characterized in that the charge and discharge circuit includes a switch module, an energy storage module, a charge and discharge switching module, and at least a first battery pack and a second battery pack;

The control device is used to send a charge and discharge enable signal, control the action of the switch module and the charge and discharge switching module, and form a first charge and discharge loop and a second charge and discharge loop that are alternately switched in the charge and discharge circuit. ;

The first charge and discharge circuit includes a first discharge circuit through which the first battery pack discharges the energy storage module and a first charging circuit through which the energy storage module charges the second battery pack;

The second charge and discharge circuit includes a second discharge circuit through which the second battery pack discharges the energy storage module and a second charging circuit through which the energy storage module charges the first battery pack.
An electronic device, characterized in that it includes a memory, a processor, and a computer program stored on the memory and executable on the processor, and the processor executes the program to implement claims 1- The control method described in any one of 10.
A charging and discharging system, characterized in that it includes a controller and a charging and discharging circuit, the controller is used to execute the control method according to any one of claims 1-10 for the charging and discharging circuit.
A computer-readable storage medium on which a computer program is stored, characterized in that the program is executed by a processor to implement the control method as described in any one of claims 1-10.