CN115378063B

CN115378063B - Control method, device, equipment, system and storage medium for charge-discharge circuit

Info

Publication number: CN115378063B
Application number: CN202210565454.8A
Authority: CN
Inventors: 李占良; 赵元淼; 黄孝键; 但志敏; 颜昱; 陈新伟
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2022-05-23
Filing date: 2022-05-23
Publication date: 2024-04-09
Anticipated expiration: 2042-05-23
Also published as: WO2023226562A1; CN115378063A

Abstract

The application discloses a control method, a device, equipment, a system and a storage medium of a charge-discharge circuit. The method comprises the following steps: transmitting a charge-discharge enabling signal, controlling the switch module and the charge-discharge switching module to act, and forming a first charge-discharge loop and a second charge-discharge loop which are alternately switched in the charge-discharge circuit; the first charging and discharging loop comprises a first discharging loop for discharging the energy storage module by the first battery pack and a first charging loop for charging the second battery pack by the energy storage module; the second charging and discharging loop comprises a second discharging loop for discharging the energy storage module by the second battery pack and a second charging loop for charging the first battery pack by the energy storage module. According to the method, alternating current flows between the at least two battery packs, internal self-heating of the battery packs is achieved, a larger range of fast thermal current frequency can be achieved, low-frequency self-heating of the battery packs can be achieved, and self-heating efficiency is high and effect is good.

Description

Control method, device, equipment, system and storage medium for charge-discharge circuit

Technical Field

The present disclosure relates to the field of battery technologies, and in particular, to a method, an apparatus, a device, a system, and a storage medium for controlling a charge/discharge circuit.

Background

Power batteries, such as lithium ion batteries, have advantages of high power density, long cycle life, good environmental protection effect, and the like, and have been increasingly used in various fields, particularly in the field of electric vehicles, such as electric vehicles using power batteries as power sources. However, the charge and discharge power and the charge and discharge capacity of the power battery are greatly attenuated in a low temperature state, and thus, it is generally necessary to charge and discharge the power battery to achieve self-heating of the power battery. The prior art lacks the technical scheme of controlling the charging and discharging circuit of the power battery, and the efficiency is lower when the power battery is charged and discharged to realize self-heating, and the heating effect is poor.

Disclosure of Invention

In view of the above problems, the present application provides a method, an apparatus, a device, a system, and a storage medium for controlling a charge/discharge circuit, which can solve the problems of the prior art that the lack of a technical scheme for controlling the charge/discharge circuit of a power battery, and the efficiency is low and the heating effect is poor when the power battery is charged/discharged to realize self-heating. The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview and is intended to neither identify key/critical elements nor delineate the scope of such embodiments. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is presented later.

In a first aspect of embodiments of the present application, a control method of a charge-discharge circuit is provided, where the charge-discharge circuit includes a switch module, an energy storage module, a charge-discharge switching module, and at least a first battery pack and a second battery pack; the method comprises the following steps:

transmitting a charge-discharge enabling signal, controlling the switch module and the charge-discharge switching module to act, and forming a first charge-discharge loop and a second charge-discharge loop which are alternately switched in the charge-discharge circuit;

the first charging and discharging loop comprises a first discharging loop for discharging the energy storage module by the first battery pack and a first charging loop for charging the second battery pack by the energy storage module;

the second charging and discharging loop comprises a second discharging loop for discharging the energy storage module by the second battery pack and a second charging loop for charging the first battery pack by the energy storage module.

The switch module and the charge-discharge switching module are controlled to act, and the first charge-discharge loop and the second charge-discharge loop which are alternately switched are formed in the charge-discharge circuit, so that alternating current flows between the at least two battery packs, internal self-heating of the battery packs is realized, a larger range of fast thermal current frequency can be realized, low-frequency self-heating of the battery packs can be realized, the equivalent impedance of battery pack cells is larger during low-frequency self-heating, and therefore, the self-heating efficiency is high, the self-heating effect is better, and the temperature rise rate is higher.

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

and alternately sending a first charge-discharge enabling signal and a second charge-discharge enabling signal according to a preset frequency, and controlling the switch module and the charge-discharge switching module to act. The first charge-discharge loop and the second charge-discharge loop which are alternately switched are formed by controlling the switch module and the charge-discharge switching module to act according to the preset frequency, so that the frequency of alternating current generated in the whole charge-discharge circuit can be regulated, and the heating rate of the battery pack is improved.

In some embodiments, the first discharge loop maintenance duration is equal to the first charge loop maintenance duration; the second discharge loop maintaining time is equal to the second charging loop maintaining time, so that the energy stored in the energy storage module can be completely charged into the corresponding battery pack when the energy storage module discharges each time.

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

The first discharging loop comprises loops among the first battery pack, the first switching circuit, the energy storage module and all the lower bridge arms;

the first charging loop and the second discharging loop comprise loops among the second battery pack, the second switching circuit, the energy storage module and all the upper bridge arms;

the second charging loop comprises a loop among the first battery pack, all the lower bridge arms, the energy storage module and the first switching circuit. The first charge-discharge loop and the second charge-discharge loop can realize that alternating current flows between the at least two battery packs, so that internal self-heating of the battery packs is realized, a larger range of fast thermal current frequency can be realized, low-frequency self-heating of the battery packs can be realized, the equivalent impedance of battery pack cells is larger during low-frequency self-heating, and therefore, the self-heating efficiency is high, the self-heating effect is better, and the temperature rise rate is higher.

In some embodiments, sending a charge-discharge enabling signal, controlling the switch module and the charge-discharge switching module to perform actions, forming a first charge-discharge loop in the charge-discharge circuit, including:

a first discharge enabling signal is sent, the first switching circuit and all the lower bridge arms are controlled to be conducted, the second switching circuit and all the upper bridge arms are controlled to be disconnected, and the first discharge loop is formed;

And sending a first charging enabling signal, controlling the second switching circuit and all the upper bridge arms to be conducted, and controlling the first switching circuit and all the lower bridge arms to be disconnected to form the first charging loop.

In some embodiments, sending a charge-discharge enabling signal, controlling the switch module and the charge-discharge switching module to perform actions, forming a second charge-discharge loop in the charge-discharge circuit, including:

sending a second discharge enabling signal, controlling all the upper bridge arms and the second switching circuit to be conducted, and controlling all the lower bridge arms and the first switching circuit to be disconnected to form a second discharge loop;

and sending a second charging enabling signal, controlling all the lower bridge arms and the first switching circuit to be conducted, and controlling all the upper bridge arms and the second switching circuit to be disconnected to form the second charging loop.

after the first charging loop finishes charging the energy storage module to the second battery pack, maintaining the current on or off states of the switch module and the charge-discharge switching module to form a second discharging loop;

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

transmitting a charge-discharge enabling signal to control the switch module and the charge-discharge switching module to act, forming a first charge-discharge loop in the charge-discharge circuit, comprising:

transmitting a first discharge enabling signal, controlling the first switching circuit and all lower bridge arms of the switch module to be conducted, and controlling all lower bridge arms of the second switching circuit and all upper bridge arms of the switch module to be disconnected, so as to form a circuit for discharging the energy storage module by the first battery pack;

And sending a first charging enabling signal, controlling the second switching circuit and all upper bridge arms of the switch module to be conducted, and controlling all upper bridge arms of the first switching circuit and all lower bridge arms of the switch module to be disconnected, so as to form a loop of charging the second battery pack by the energy storage module.

transmitting a charge-discharge enabling signal to control the switch module and the charge-discharge switching module to act, forming a second charge-discharge loop in the charge-discharge circuit, comprising:

transmitting a second discharge enabling signal, controlling all upper bridge arms of the switch module and all lower bridge arms of the second switching circuit to be conducted, and controlling all lower bridge arms of the switch module and all upper bridge arms of the first switching circuit to be disconnected to form a second discharge loop;

And sending a second charging enabling signal, controlling all lower bridge arms of the switch module and all upper bridge arms of the first switching circuit to be conducted, and controlling all upper bridge arms of the switch module and all lower bridge arms of the second switching circuit to be 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 with the second end of the first battery pack, the second end of the switch module and the second end of the charge-discharge switching module in a collinear manner;

before the transmitting the charge-discharge enable signal, the method further includes:

and controlling to open the switch. The connection relation between the first battery pack and the second battery pack can be adjusted by controlling the switch, and after the switch is opened, the first battery pack and the second battery pack can be connected in series, so that the control method of the charge-discharge circuit is realized.

In a second aspect of the embodiments of the present application, a control device for a charge-discharge circuit is provided, where the charge-discharge circuit includes a switch module, an energy storage module, a charge-discharge switching module, and at least a first battery pack and a second battery pack;

The control device is used for sending a charge-discharge enabling signal and controlling the switch module and the charge-discharge switching module to act, and a first charge-discharge loop and a second charge-discharge loop which are alternately switched are formed in the charge-discharge circuit;

the second charging and discharging loop comprises a second discharging loop for discharging the energy storage module by the second battery pack and a second charging loop for charging the first battery pack by the energy storage module. The technical solution of the second aspect can achieve the same advantageous technical effects as the technical solution of the first aspect.

In a third aspect of the embodiments of the present application, there is provided an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor executing the program to implement the control method of the charge-discharge circuit of the first aspect. The technical solution of the third aspect can achieve the same advantageous technical effects as the technical solution of the first aspect.

In a fourth aspect of embodiments of the present application, there is provided a charge-discharge system, including a controller and a charge-discharge circuit, where the controller is configured to execute, for the charge-discharge circuit, the control method of the charge-discharge circuit of the first aspect. The technical solution of the fourth aspect can achieve the same advantageous technical effects as the technical solution of the first aspect.

In a fifth aspect of embodiments of the present application, there is provided a computer-readable storage medium having stored thereon a computer program that is executed by a processor to implement the control method of the charge-discharge circuit of the first aspect. The technical solution of the fifth aspect can achieve the same advantageous technical effects as the technical solution of the first aspect.

One of the technical solutions provided in one aspect of the embodiments of the present application may include the following beneficial effects:

according to the control method for the charge-discharge circuit, the switch module and the charge-discharge switching module are controlled to act, and the first charge-discharge circuit and the second charge-discharge circuit which are alternately switched are formed in the charge-discharge circuit, so that alternating current flows between the at least two battery packs, internal self-heating of the battery packs is achieved, a larger range of fast thermal current frequency can be achieved, low-frequency self-heating of the battery packs can be achieved, equivalent impedance of battery pack cells is larger during low-frequency self-heating, and therefore self-heating efficiency is high, self-heating effect is better, and temperature rise rate is higher.

Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 illustrates a block diagram of a charge-discharge circuit according to some embodiments of the present application;

FIG. 2 illustrates a circuit diagram of a charge-discharge circuit according to some embodiments of the present application;

FIG. 3 illustrates a flow chart of a control method of a charge-discharge circuit according to some embodiments of the present application;

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

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

FIG. 6 shows a flow chart of further embodiments of step S20 in FIG. 3;

FIG. 7 illustrates a circuit diagram of a charge-discharge circuit according to some embodiments of the present application;

FIG. 8 illustrates a circuit diagram of a charge-discharge circuit according to some embodiments of the present application;

FIG. 9 illustrates a circuit diagram of a charge-discharge circuit of some embodiments of the present application;

FIG. 10 illustrates a block diagram of an electronic device of some embodiments of the present application;

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

The achievement of the objects, functional features and advantages of the present application will be further described with reference to the accompanying drawings in conjunction with the embodiments.

Detailed Description

Embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical solutions of the present application, and thus are only examples, and are not intended to limit the scope of protection of the present application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description and claims of the present application and in the description of the figures above are intended to cover non-exclusive inclusions.

In the description of the embodiments of the present application, the technical terms "first," "second," etc. are used merely to distinguish between different objects and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, a particular order or a primary or secondary relationship. In the description of the embodiments of the present application, the meaning of "plurality" is two or more unless explicitly defined otherwise.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of such phrases 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 of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

In the description of the embodiments of the present application, the term "and/or" is merely an association relationship describing an association object, which means that three relationships may exist, for example, a and/or B may mean: there are three cases, a, B, a and B simultaneously. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two), and similarly, "plural sets" refers to two or more (including two), and "plural sheets" refers to two or more (including two). In the description of the embodiments of the present application, the orientation or positional relationship indicated by the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of describing the embodiments of the present application and for simplifying the description, rather than indicating or implying that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the embodiments of the present application.

In the description of the embodiments of the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured" and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; or may be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the embodiments of the present application will be understood by those of ordinary skill in the art according to the specific circumstances.

The power battery has the advantages of high power, high energy density, good environmental protection effect and the like, and has been widely applied to the technical fields of new energy vehicles, consumer electronics, energy storage systems and the like. Power cells can be used, but are not limited to, in electrical devices such as vehicles, boats or aircraft.

Taking an electric vehicle as an example, the electric vehicle powered by the power battery has the advantages of good environmental protection effect, low noise, low cost, capability of effectively promoting energy conservation, emission reduction and the like, has huge market application prospect, and is beneficial to economic sustainable development. Due to the electrochemical properties of the power cell, the performance of the power cell is greatly limited at lower temperatures, severely affecting use in low temperature environments. Therefore, in order to enable normal use of the power battery, it is necessary to heat the power battery in a low-temperature environment. The inventor finds that when the power battery is heated in the prior art, a technical scheme for controlling a charging and discharging circuit of the power battery is lacking, and the efficiency is low when the power battery is charged and discharged to realize self-heating, so that the heating effect is poor, and therefore, the problems in the prior art are needed to be solved.

In view of the above problems, the embodiments of the present application provide a control method for a charge/discharge circuit, where a switch module and a charge/discharge switching module are controlled to perform actions, and a first charge/discharge loop and a second charge/discharge loop that are alternately switched are formed in the charge/discharge circuit, so as to realize that alternating current flows between at least two battery packs, realize internal self-heating of the battery packs, and realize a wider range of fast thermal current frequency, and realize low-frequency self-heating of the battery packs, and the equivalent impedance of battery cells is larger during low-frequency self-heating, so that self-heating efficiency is high, self-heating effect is better, and temperature rise rate is higher.

As shown in fig. 1, in some embodiments, the charge-discharge circuit includes a power supply module 1, a switch module 2, an energy storage module 3, and a charge-discharge switching module 4, and the power supply module 1 includes at least a first battery pack 11 and a second battery pack 12. According to the actual application, the power supply module 1 may include a plurality of battery packs, and the specific number may be set according to the actual application.

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

transmitting a charge-discharge enabling signal, controlling the switch module 2 and the charge-discharge switching module 4 to operate, and forming a first charge-discharge loop and a second charge-discharge loop which are alternately switched in the charge-discharge circuit;

the first charging and discharging circuit comprises a first discharging circuit for discharging the energy storage module 3 by the first battery pack 11 and a first charging circuit for charging the second battery pack 12 by the energy storage module 3;

the second charge-discharge circuit includes a second discharge circuit in which the second battery pack 12 discharges the energy storage module 3 and a second charge circuit in which the energy storage module 3 charges the first battery pack 11.

The switch module 2 and the charge-discharge switching module 4 are controlled to act, and a first charge-discharge loop and a second charge-discharge loop which are alternately switched are formed in the charge-discharge circuit, so that alternating current flows between the at least two battery packs, internal self-heating of the battery packs is realized, a larger range of fast thermal current frequency can be realized, low-frequency self-heating of the battery packs can be realized, the equivalent impedance of battery pack cells is larger during low-frequency self-heating, and therefore, 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-discharge enable signal, controlling the switch module 2 and the charge-discharge switching module 4 to perform actions may include: the first charge-discharge enabling signal and the second charge-discharge enabling signal are alternately sent according to the preset frequency, and the switch module 2 and the charge-discharge switching module 4 are controlled to operate. By controlling the switch module 2 and the charge-discharge switching module 4 to operate according to a preset frequency, a first charge-discharge loop and a second charge-discharge loop which are alternately switched are formed, and the frequency of alternating current generated in the whole charge-discharge circuit can be adjusted, so that the rate of heating the battery pack is improved.

In some embodiments, the first discharge circuit maintaining time period is equal to the first charge circuit maintaining time period, and the second discharge circuit maintaining time period is equal to the second charge circuit maintaining time period, so that it can be ensured that the electric energy stored in the energy storage module 3 can be completely charged into the corresponding battery pack when the energy storage module 3 discharges each time.

As shown in fig. 2, in some embodiments, the charge-discharge switching module 4 includes a first switching circuit 401 and a second switching circuit 402 connected in series; the switch module 2 comprises a first M-phase bridge arm circuit, M is a positive integer, and each phase bridge arm circuit comprises an upper bridge arm and a lower bridge arm which are connected in series; in the circuit shown in fig. 2, M is 3, that is, the first M-phase bridge arm circuit is a three-phase bridge arm circuit; the first discharging loop comprises a loop among the first battery pack 11, the first switching circuit 401, the energy storage module 3 and all lower bridge arms; the first charging loop and the second discharging loop comprise loops among the second battery pack 12, the second switching circuit 402, the energy storage module 3 and all upper bridge arms; the second charging circuit comprises a 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 set including a plurality of battery modules, or may be a battery module including a plurality of battery cells. The first charge-discharge loop and the second charge-discharge loop can realize that alternating current flows between the at least two battery packs, so that internal self-heating of the battery packs is realized, a larger range of fast thermal current frequency can be realized, low-frequency self-heating of the battery packs can be realized, the equivalent impedance of battery pack cells is larger during low-frequency self-heating, and therefore, 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 realized by an inverter, and comprises M-phase bridge arms, wherein M is a positive integer; each phase leg includes an upper leg and a lower leg. For example, the M-phase bridge arms include M upper bridge arms and M lower bridge arms, and the M upper bridge arms are connected to the M lower bridge arms in a one-to-one correspondence. The energy storage module 3 may comprise an M-phase motor, which may be an M-phase winding motor, having M-phase windings.

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

In this example, the charge-discharge switching module 4 includes a first switching circuit 401 and a second switching circuit 402 connected in series. The first switching circuit 401 and the second switching circuit 402 may be configured by a transistor and a flywheel diode connected in parallel, or may include only a switch. As shown in fig. 2, the first switching circuit 401 has a structure of a transistor V7 and a flywheel diode D7 connected in parallel, and the second switching circuit 402 has a structure of a transistor V8 and a flywheel diode D8 connected in parallel.

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

The connection point of the upper and lower bridge arms of the charge-discharge switching module 4 can be directly connected with the neutral point of the M-phase motor through a wire, or a second energy storage element can be connected between the connection point of the upper and lower bridge arms of the charge-discharge switching module 4 and the neutral point of the M-phase motor, and the second energy storage element can comprise at least one inductor L1, or comprise an inductor, a capacitor and the like which are connected in series. In some examples, the inductance L1 is adapted to the charge-discharge performance and the rapid heating requirement of the power supply module, and the minimum inductance is 0H (i.e. equivalent to a dc wire).

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

With respect to the circuit shown in fig. 2, in the control method of the present embodiment, as shown in fig. 3, a charge/discharge enable signal is transmitted to control the switch module 2 and the charge/discharge switching module 4 to operate, and a first charge/discharge circuit and a second charge/discharge circuit which are alternately switched are formed in the charge/discharge circuit, and the control method includes steps S10 and S20:

and S10, transmitting a charge-discharge enabling signal, controlling the switch module 2 and the charge-discharge switching module 4 to operate, and forming a first charge-discharge loop in the charge-discharge circuit.

As shown in fig. 4, in some embodiments, step S10 includes S101 and S102:

s101, a first discharge enabling signal is sent, the first switching circuit 401 and all lower bridge arms are controlled to be conducted, the second switching circuit 402 and all upper bridge arms are controlled to be disconnected, and a first discharge loop is formed.

Specifically, a first discharge enable signal is sent, and the first switching circuit 401 and the lower arm 212, the lower arm 222, and the lower arm 232 are controlled to be turned on, and the second switching circuit 402 and the upper arm 211, the upper arm 221, and the upper arm 231 are controlled to be turned off, so as to form a first discharge loop.

The current direction of the first discharge loop is: positive electrode of first battery 11→first switching circuit 401→energy storage module 3→lower arm 212, lower arm 222, and lower arm 232→negative electrode of first battery 11. The storage of at least part of the electrical energy of the first battery 11 into the energy storage module 3 is effected by means of a first discharge circuit.

S102, a first charge enabling signal is sent, the second switching circuit 402 and all upper bridge arms are controlled to be conducted, and the first switching circuit 401 and all lower bridge arms are controlled to be disconnected, so that a first charge loop is formed.

Specifically, a first charge enable signal is sent, and the second switching circuit 402 and the upper arm 211, the upper arm 221, and the upper arm 231 are controlled to be turned on, and the first switching circuit 401 and the lower arm 212, the lower arm 222, and the lower arm 232 are controlled to be turned off, so as to form a first charge loop.

The current direction of the first charging loop is: negative electrode of the second battery pack 12→the second switching circuit 402→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. Charging the second battery 12 with the electrical energy stored in the energy storage module 3 is achieved by means of a first charging circuit.

And S20, transmitting a charge-discharge enabling signal, controlling the switch module 2 and the charge-discharge switching module 4 to operate, and forming a second charge-discharge loop in the charge-discharge circuit.

As shown in fig. 5, in some embodiments, step S20 includes S201 and S202:

and S201, sending a second discharge enabling signal, controlling all upper bridge arms and the second switching circuit 402 to be conducted, and controlling all lower bridge arms and the first switching circuit 401 to be disconnected to form a second discharge loop.

The current direction of the second discharge loop is as follows: positive electrode of second battery 12→upper arm 211, upper arm 221, and upper arm 231→energy storage module 3→second switching circuit 402→negative electrode of second battery 12. The storage of at least part of the electrical energy of the second battery 12 into the energy storage module 3 is achieved by means of a second discharge circuit.

And S202, sending a second charging enabling signal, controlling all lower bridge arms and the first switching circuit 401 to be conducted, and controlling all upper bridge arms and the second switching circuit 402 to be disconnected to form a second charging loop.

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

In other embodiments, as shown in FIG. 6, step S20 includes S20-1 and S20-2:

S20-1, after the first charging loop completes charging the energy storage module 3 to the second battery pack 12, maintaining the current on or off states of the switch module 2 and the charge-discharge switching module 4 to form a second discharging loop.

Specifically, the current direction of the second discharge loop is: positive electrode of second battery 12→upper arm 211, upper arm 221, and upper arm 231→energy storage module 3→second switching circuit 402→negative electrode of second battery 12. The storage of at least part of the electrical energy of the second battery 12 into the energy storage module 3 is achieved by means of a second discharge circuit.

S20-2, a second charge enabling signal is sent, all lower bridge arms and the first switching circuit 401 are controlled to be conducted, all upper bridge arms and the second switching circuit 402 are controlled to be disconnected, and a second charge loop is formed.

Specifically, the current direction of the second charging loop is: negative electrode of first battery 11→lower arm 212, lower arm 222, and lower arm 232→energy storage module 3→first switching circuit 401→positive electrode of first battery 11. Charging the electric energy stored in the energy storage module 3 into the first battery pack 11 is achieved by means of a second charging circuit.

As shown in fig. 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 a neutral point of the first M-phase motor is connected to a neutral point of the second M-phase motor; the first switching circuit includes at least one upper arm of M upper arms of the second M-phase arm circuit, and in this embodiment, description is given by taking the M upper arms of the first switching circuit including the second M-phase arm circuit as an example; the second switching circuit includes at least one lower bridge arm of M lower bridge arms of the second M-phase bridge arm circuit, and in this embodiment, description is given by taking the M lower bridge arms of the second switching circuit including the second M-phase bridge arm circuit as an example; fig. 7 shows a circuit configuration of a charge and discharge circuit for heating a dual battery pack using dual motors, i.e., a circuit topology when M motor is dual motor.

Specifically, as shown in fig. 7, the M-phase winding connection point of the first M-phase motor is connected with the M-phase winding connection point of the second M-phase motor. The first M-phase motor and the second M-phase motor can be three-phase winding motors, and the first M-phase motor comprises a winding A1, a winding B1 and a winding C1; the second M-phase motor includes winding a '1, winding B '1, and winding C '1. The common connection point of the windings A1, B1, C1 is connected to the common connection point of the windings a '1, B '1, C '1.

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

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

Step S10 includes S10-1 and S10-2:

s10-1, a first discharge enabling signal is sent, all lower bridge arms of the first switching circuit and the switch module 2 are controlled to be conducted, all lower bridge arms of the second switching circuit and all upper bridge arms of the switch module 2 are controlled to be disconnected, and a circuit for discharging the energy storage module 3 by the first battery pack 11 is formed.

Specifically, the current direction in the circuit in which the first battery pack 11 discharges the energy storage module 3 is: the current direction of the first discharge loop is: positive electrode of first battery 11→upper arm 411, upper arm 421 and upper arm 431→energy storage module 3→lower arm 212, lower arm 222 and lower arm 232→negative electrode of first battery 11. The storage of at least part of the electrical energy of the first battery 11 into the energy storage module 3 is effected by means of a first discharge circuit.

S10-2, a first charge enabling signal is sent, all upper bridge arms of the second switching circuit and the switch module 2 are controlled to be conducted, all upper bridge arms of the first switching circuit and all lower bridge arms of the switch module 2 are controlled to be disconnected, and a loop in which the second battery pack 12 is charged by the energy storage module 3 is formed.

Specifically, the current direction in the circuit in which the second battery pack 12 is charged by the energy storage module 3 is: negative electrode of second battery 12→lower arm 412, lower arm 422 and lower arm 432→energy storage module 3→upper arm 211, upper arm 221 and upper arm 231→positive electrode of second battery 12. Charging the second battery 12 with the electrical energy stored in the energy storage module 3 is achieved by means of a first charging circuit.

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

s20 (1), a second discharge enabling signal is sent, all upper bridge arms of the switch module 2 and all lower bridge arms of the second switching circuit are controlled to be conducted, all lower bridge arms of the switch module 2 and all upper bridge arms of the first switching circuit are controlled to be disconnected, and a second discharge loop is formed.

Specifically, the current direction of the second discharge loop is: positive electrode of second battery 12→upper arm 211, upper arm 221, and upper arm 231→energy storage module 3→lower arm 412, lower arm 422, and lower arm 432→negative electrode of second battery 12. The storage of at least part of the electrical energy of the second battery 12 into the energy storage module 3 is achieved by means of a second discharge circuit.

S20 (2) sending a second charging enabling signal, controlling all lower bridge arms of the switch module 2 and all upper bridge arms of the first switching circuit to be conducted, and controlling all upper bridge arms of the switch module 2 and all lower bridge arms of the second switching circuit to be disconnected, so as to form a second charging loop.

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

In the embodiment of fig. 7, by controlling the currents flowing into the windings A1 to C1 to be equal in magnitude and identical in phase, it is possible to effectively suppress vibration noise of the first motor in the process of heating the power battery by the motor circuit. Similarly, by controlling the currents flowing out of the windings a '1 to C'1 to be equal in magnitude and identical in phase, vibration noise of the second motor can be effectively suppressed in the process of heating the power battery by the motor circuit. Meanwhile, the motor is prevented from running, and the problem of heating of the rotor in the motor can be solved, so that the self-heating service time of the battery is prolonged.

As shown in fig. 8 and 9, in some embodiments, a first switch K1 is connected between a first end of the first battery pack 11 and a first end of the second battery pack 12; the second end of the second battery pack 12 is connected 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-discharge switching module 4 in a collinear manner; a first switch K1 is connected between the first battery pack 11 and the second battery pack 12 (the first switch K1 is not shown in fig. 1, the broken line in the power supply module 1 in fig. 1 indicates that the connection relationship is variable), and the first switch K1 is disposed between the first end of the second battery pack 12 and the first end of the first battery pack 11; the open/close 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 pack 11 is connected in parallel with the second battery pack 12; the first battery pack 11 is connected in series with the second battery pack 12 when the first switch K1 is turned off. A second switch K2 may also be disposed between the connection point of the upper and lower bridge arms of the charge-discharge switching module 4 and the neutral point of the M-phase motor.

Specifically, before sending the charge-discharge enabling signal and controlling the switch module 2 and the charge-discharge switching module 4 to operate, and forming the first charge-discharge loop and the second charge-discharge loop that are alternately switched in the charge-discharge circuit, the method further includes: the first switch K1 is controlled to be turned on so that the first battery pack 11 is connected in series with the second battery pack 12.

When the motor is required to heat the two battery packs, the first switch K1 is turned off, and the first battery pack 11 is connected in series with the second battery pack 12. By controlling the upper arm or the lower arm of the M-phase arm, and the first upper arm 401 and the first lower arm 402 of the charge-discharge switching module 4, charge-discharge control of the first battery pack 11 and the second battery pack 12 can be achieved.

In some embodiments, before executing the control method of the present embodiment, the battery management system BMS collects battery pack data, including but not limited to temperature, SOC, voltage, current, etc., determines whether the battery pack is normal and whether the battery pack satisfies a self-heating (rapid heating) condition; if the condition is met, the BMS sends a heating request to the VCU; MCU (Motor control unit) motor controller collects motor data including, but not limited to, voltage, current, temperature, etc., determines if the motor is in a stationary state and if a heating condition is met; when the VCU is needed, the MCU sends a self-checking state to the VCU; the whole vehicle controller VCU (Vehicle control unit) judges whether the pulse heating device is started to heat the battery according to a heating request sent by the BMS and the working state of the motor sent by the MCU; if the condition is met, the VCU issues a quick heating start instruction; after the controller receives the self-heating starting instruction or judges that the whole vehicle can start self-heating, the control switch K1 is opened, the switch K2 is closed, and then the controller starts to execute the control method of the embodiment. After the control method of the embodiment is executed, the BMS judges whether each parameter of the battery packs is normal, if so, the BMS sends abnormal information to the whole vehicle controller, the whole vehicle controller forwards the abnormal information to the pulse heating device controller, the pulse heating device stops working, and the two battery packs are switched into a parallel connection mode.

In this embodiment, the triode may be an insulated gate bipolar power transistor (Insulated Gate Bipolar Transistor, IGBT), a metal-oxide semiconductor field effect transistor (MOS), or other electronic components with switching functions, which is not limited herein.

In this embodiment, the design of adopting many group batteries can reduce the restraint of motor inductance to heating current size and heating current frequency effectively, through the heating mode of double cell, can in time release the energy of energy storage module 3 to one of them battery for the heating current of battery can maintain at a stable heating current size according to preset heating frequency, can produce alternating current in the charge-discharge circuit, makes the battery under different temperature, SOC state, through the regulation to heating current frequency, makes the heating rate promote by a wide margin.

The execution main body of the control method of the charge and discharge circuit can be a controller, the controller can be composed of a BMS vehicle MCU, the BMS is responsible for state monitoring and switch control of a power supply module side, the MCU is responsible for state monitoring and switch control of a motor side, and the controller can also be a whole vehicle domain controller.

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

the control device is used for sending a charge-discharge enabling signal and controlling the switch module 2 and the charge-discharge switching module 4 to act, and a first charge-discharge loop and a second charge-discharge loop which are alternately switched are formed in the charge-discharge circuit;

the first charging and discharging loop comprises a first discharging loop for discharging the energy storage module 3 by the first battery pack and a first charging loop for charging the second battery pack by the energy storage module 3;

the second charge-discharge circuit includes a second discharge circuit for discharging the energy storage module 3 by the second battery pack and a second charge circuit for charging the first battery pack by the energy storage module 3.

In some embodiments, the transmitting the charge-discharge enable signal performed by the control device controls the switch module and the charge-discharge switching module to perform actions, including:

and alternately sending the first charge-discharge enabling signal and the second charge-discharge enabling signal according to a preset frequency, and controlling the switch module and the charge-discharge switching module to act.

In some embodiments, the first discharge loop maintenance duration is equal to the first charge loop maintenance duration; the second discharge loop maintaining time is equal to the second charge loop maintaining time.

the first discharging loop comprises a first battery pack, a first switching circuit, an energy storage module and loops among all lower bridge arms;

the first charging loop and the second discharging loop comprise a second battery pack, a second switching circuit, an energy storage module and loops among all upper bridge arms;

the second charging loop comprises a loop among the first battery pack, all lower bridge arms, the energy storage module and the first switching circuit.

In some embodiments, the transmitting of the charge-discharge enable signal by the control device controls the switch module and the charge-discharge switching module to operate, and forms a first charge-discharge loop in the charge-discharge circuit, including:

transmitting a first discharge enabling signal, controlling the first switching circuit and all lower bridge arms to be conducted, and controlling the second switching circuit and all upper bridge arms to be disconnected to form a first discharge loop;

and sending a first charging enabling signal, controlling the second switching circuit and all the upper bridge arms to be conducted, and controlling the first switching circuit and all the lower bridge arms to be disconnected to form a first charging loop.

In some embodiments, the transmitting of the charge-discharge enable signal by the control device controls the switch module and the charge-discharge switching module to operate, and forms a second charge-discharge loop in the charge-discharge circuit, including:

transmitting a second discharge enabling signal, controlling all upper bridge arms and the second switching circuit to be conducted, and controlling all lower bridge arms and the first switching circuit to be disconnected to form a second discharge loop;

and sending a second charging enabling signal, controlling all the lower bridge arms and the first switching circuit to be conducted, and controlling all the upper bridge arms and the second switching circuit to be disconnected to form a second charging loop.

after the first charging loop finishes charging the energy storage module to the second battery pack, maintaining the current on or off states of the switch module and the charging and discharging switching module to form a second discharging loop;

In some embodiments, the energy storage module comprises 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 with the neutral point of the second M-phase motor; the first switching circuit comprises at least one upper bridge arm of M upper bridge arms of a second M-phase bridge arm circuit, and the second switching circuit comprises at least one lower bridge arm of M lower bridge arms of the second M-phase bridge arm circuit;

the control device sends a charge-discharge enabling signal to control the switch module and the charge-discharge switching module to act, and a first charge-discharge loop is formed in the charge-discharge circuit, comprising:

transmitting a first discharge enabling signal, controlling the first switching circuit and all lower bridge arms of the switch module to be conducted, and controlling all lower bridge arms of the second switching circuit and all upper bridge arms of the switch module to be disconnected, so as to form a loop for discharging the energy storage module by the first battery pack;

and sending a first charging enabling signal, controlling the second switching circuit and all upper bridge arms of the switch module to be conducted, and controlling all upper bridge arms of the first switching circuit and all lower bridge arms of the switch module to be disconnected, so as to form a loop of the second battery pack charged by the energy storage module.

The control device sends a charge-discharge enabling signal to control the switch module and the charge-discharge switching module to act, and a second charge-discharge loop is formed in the charge-discharge circuit, comprising:

and sending a second charging enabling signal, controlling all lower bridge arms of the switch module and all upper bridge arms of the first switching circuit to be conducted, and controlling all upper bridge arms of the switch module and all lower bridge arms of the second switching circuit to be disconnected to form a second charging loop.

before the control device executes the transmission of the charge-discharge enabling signal and the transmission of the charge-discharge enabling signal, and controls the switch module and the charge-discharge switching module to act, the control device further executes: and controlling to open a switch.

Another 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, where the processor executes the program to implement the method for controlling the charge and discharge circuit according to any one of the foregoing embodiments.

As shown in fig. 10, the electronic device 10 may include: processor 100, memory 101, bus 102 and communication interface 103, processor 100, communication interface 103 and memory 101 being connected by bus 102; the memory 101 has stored therein a computer program executable on the processor 100, which when executed by the processor 100 performs the method provided by any of the embodiments described herein.

The memory 101 may include a high-speed random access memory (RAM: random Access Memory), and may further include a non-volatile memory (non-volatile memory), such as at least one disk memory. The communication connection between the system network element and the at least one other network element is implemented via at least one communication interface 103 (which may be wired or wireless), the internet, a wide area network, a local network, a metropolitan area network, etc. may be used.

Bus 102 may be an ISA bus, a PCI bus, an EISA bus, or the like. The buses may be divided into address buses, data buses, control buses, etc. The memory 101 is configured to store a program, and the processor 100 executes the program after receiving an execution instruction, and the method disclosed in any of the foregoing embodiments of the present application may 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. In implementation, the steps of the above method may be performed by integrated logic circuits of hardware in the processor 100 or by instructions in the form of software. The processor 100 may be a general-purpose processor, and may include a central processing unit (Central Processing Unit, CPU for short), a network processor (Network Processor, NP for short), and the like; but may also be a Digital Signal Processor (DSP), application Specific Integrated Circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components. The disclosed methods, steps, and logic blocks in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the embodiments of the present application may be embodied directly in hardware, in a decoded processor, or in a combination of hardware and software modules in a decoded processor. The software modules may be located in a random access memory, flash memory, read only memory, programmable read only memory, or electrically erasable programmable memory, registers, etc. as well known in the art. The storage medium is located in the memory 101, and the processor 100 reads the information in the memory 101 and, in combination with its hardware, performs the steps of the method described above.

The electronic device provided by the embodiment of the application and the method provided by the embodiment of the application are the same in the invention conception, and have the same beneficial effects as the method adopted, operated or realized by the electronic device.

Another embodiment of the present application provides a charge and discharge system, including a controller and a charge and discharge circuit, where the controller is configured to execute the control method of the charge and discharge circuit according to any one of the foregoing embodiments with respect to the charge and discharge circuit.

Another embodiment of the present application provides a computer-readable storage medium having stored thereon a computer program that is executed by a processor to implement the control method of the charge-discharge circuit of any of the above embodiments.

Referring to fig. 11, a computer readable storage medium is shown as an optical disc 20 having a computer program (i.e., a program product) stored thereon, which, when executed by a processor, performs the method provided by any of the embodiments described above.

It should be noted that examples of the computer readable storage medium may also include, but are not limited to, a phase change memory (PRAM), a Static Random Access Memory (SRAM), a Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), a Read Only Memory (ROM), an Electrically Erasable Programmable Read Only Memory (EEPROM), a flash memory, or other optical or magnetic storage medium, which will not be described in detail herein.

The computer readable storage medium provided by the above-described embodiments of the present application has the same advantageous effects as the method adopted, operated or implemented by the application program stored therein, for the same inventive concept as the method provided by the embodiments of the present application.

It should be noted that:

the term "module" is not intended to be limited to a particular physical form. Depending on the particular application, modules may be implemented as hardware, firmware, software, and/or combinations thereof. Furthermore, different modules may 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 presented herein are not inherently related to any particular computer, virtual machine, or other apparatus. Various general purpose devices may also be used with the examples herein. The required structure for the construction of such devices is apparent from the description above. In addition, the present application is not directed to any particular programming language. It will be appreciated that a variety of programming languages may be used to implement the teachings of the present application as described herein, and the above description of specific languages is provided for disclosure of preferred embodiments of the present application.

It should be understood that, although the steps in the flowcharts of the figures are shown in order as indicated by the arrows, these steps are not necessarily performed in order as indicated by the arrows. The steps are not strictly limited in order and may be performed in other orders, unless explicitly stated herein. Moreover, at least some of the steps in the flowcharts of the figures may include a plurality of sub-steps or stages that are not necessarily performed at the same time, but may be performed at different times, the order of their execution not necessarily being sequential, but may be performed in turn or alternately with other steps or at least a portion of the other steps or stages.

The foregoing examples merely represent embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the present application. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application shall be subject to the appended claims.

Claims

1. The control method of the charge-discharge circuit is characterized in that the charge-discharge circuit comprises a switch module, an energy storage module, a charge-discharge switching module and at least a first battery pack and a second battery pack; the method comprises the following steps:

the second charging and discharging loop comprises a second discharging loop for discharging the energy storage module by the second battery pack and a second charging loop for charging the first battery pack by the energy storage module;

The sending of the charge-discharge enabling signal controls the switch module and the charge-discharge switching module to act, including:

and alternately sending a first charge-discharge enabling signal and a second charge-discharge enabling signal according to a preset frequency, and controlling the switch module and the charge-discharge switching module to act.

2. The method of claim 1, wherein the first discharge circuit maintenance duration is equal to the first charge circuit maintenance duration; the second discharge loop maintaining time length is equal to the second charge loop maintaining time length.

3. The method of claim 1, wherein the charge-discharge switching module comprises a first switching circuit and a second switching circuit in series; the switch module comprises a first M-phase bridge arm circuit, M is a positive integer, and each phase bridge arm circuit comprises an upper bridge arm and a lower bridge arm which are connected in series;

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

4. The method of claim 3, wherein transmitting a charge-discharge enable signal to control the switching module and the charge-discharge switching module to operate, forming a first charge-discharge loop in the charge-discharge circuit, comprises:

5. The method of claim 3 or 4, wherein transmitting a charge-discharge enable signal to control the switching module and the charge-discharge switching module to operate, forming a second charge-discharge loop in the charge-discharge circuit, comprises:

6. The method of claim 3 or 4, wherein transmitting a charge-discharge enable signal to control the switching module and the charge-discharge switching module to operate, forming a second charge-discharge loop in the charge-discharge circuit, comprises:

7. A method according to claim 3, wherein the energy storage module comprises a first M-phase motor and a second M-phase motor, M being a positive integer, the neutral point of the first M-phase motor being connected to the neutral point of the second M-phase motor; the first switching circuit comprises at least one upper bridge arm of M upper bridge arms of a second M-phase bridge arm circuit, and the second switching circuit comprises at least one lower bridge arm of M lower bridge arms of the second M-phase bridge arm circuit;

8. A method according to claim 3, wherein the energy storage module comprises a first M-phase motor and a second M-phase motor, M being a positive integer, the neutral point of the first M-phase motor being connected to the neutral point of the second M-phase motor; the first switching circuit comprises at least one upper bridge arm of M upper bridge arms of a second M-phase bridge arm circuit, and the second switching circuit comprises at least one lower bridge arm of M lower bridge arms of the second M-phase bridge arm circuit;

9. The method of any one of claims 1-8, wherein 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 with the second end of the first battery pack, the second end of the switch module and the second end of the charge-discharge switching module in a collinear manner;

Before the charge-discharge enabling signal is sent to control the switch module and the charge-discharge switching module to act, the method further comprises:

and controlling to open the switch.

10. The control device of the charge-discharge circuit is characterized by comprising a switch module, an energy storage module, a charge-discharge switching module and at least a first battery pack and a second battery pack;

the control device is further specifically configured to alternately send a first charge-discharge enabling signal and a second charge-discharge enabling signal according to a preset frequency, and control the switch module and the charge-discharge switching module to perform actions.

11. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor executing the program to implement the control method of any one of claims 1-9.

12. A charge-discharge system comprising a controller and a charge-discharge circuit, the controller being configured to execute the control method according to any one of claims 1 to 9 for the charge-discharge circuit.

13. 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 according to any one of claims 1-9.