Power battery heating circuit, system, control method and power consuming device

Abstract

The embodiments of the present application provide a power battery heating circuit, a system, a control method, and a power consumption device, which includes a power supply module including at least one assembled battery, an inverter module connected to the power supply module and including an M-phase arm circuit, where the arm circuit is connected in parallel with the assembled battery, where M is an even multiple of 3, a drive module including a motor with M windings, where the M windings are connected in one-to-one correspondence with the M-phase arms of the arm circuit, and a control module connected to the arm circuit and controlling the upper arms of at least three-phase arms in the arm circuit and the lower arms of the remaining arms with the same number of phases to be turned on, so as to cause the power supply module, the inverter module, and the drive module to form alternating charging and discharging circuits.This application can realize rapid heating of the battery of the power supply module based on a conventional multi-phase motor.

Description

[Technical field]

[0001] The present application relates to the field of battery technology, and in particular to a power battery heating circuit, system, control method and power consuming device. [Background technology]

[0002] Due to their advantages of high energy density, cyclic charging, safety and environmental protection, power batteries are widely used in fields such as new energy vehicles, consumer electronics and energy storage systems.

[0003] However, in a low-temperature environment, the use of the power battery is limited to a certain extent. Specifically, the discharge capacity of the power battery is greatly reduced in a low-temperature environment, and the battery cannot be charged in a low-temperature environment. In particular, a six-phase motor (or a motor with more phases) requires more power provided by the power battery, and when the charging and discharging ability of the power battery is limited, the experience of the six-phase motor vehicle is also worse. Therefore, it is necessary to heat the power battery in a low-temperature environment so that the power battery can be used normally. Summary of the Invention

[0004] The embodiments of the present application provide a power battery heating circuit, system, control method and power consumption device that can realize rapid heating of the battery of a power supply module based on a conventional multi-phase motor.

[0005] According to a first aspect, the present application provides a power battery heating circuit, comprising: a power supply module including at least one assembled battery; an inverter module connected to the power supply module and including an M-phase arm circuit, the arm circuit being connected in parallel with the assembled battery, where M is an even multiple of 3; a drive module including a motor having M windings, the M windings being connected in one-to-one correspondence with the M-phase arms of the arm circuit; and a control module connected to the arm circuit, for controlling an upper arm of at least a three-phase arm in the arm circuit and a lower arm of the remaining arm having the same number of phases to be all turned on, to form a charging circuit and a discharging circuit that are alternately switched between the power supply module, the inverter module and the drive module.

[0006] In the technical solution of the embodiment of the present application, a control module is installed connected to the inverter module, and the on or off of each phase arm in the arm circuit is controlled to form a charging circuit or a discharging circuit in the power supply module, the inverter module and the driving module. When the charging circuit or discharging circuit is operating, a current flows through the battery pack of the power supply module, and the battery pack has a certain internal resistance and consumes some of the current, and converts the electrical energy into thermal energy to generate heat and heat the battery pack of the power supply module. In order to effectively heat the assembled battery, especially the assembled battery of a six-phase motor drive system, in this embodiment, the control module controls at least the upper arm of the three-phase arm in the arm circuit and the lower arm of the remaining arm having the same number of phases to be turned on, and the power supply module, the inverter module, and the drive module form alternately switching charging and discharging circuits to charge and discharge the assembled battery. In this way, a charging and discharging circuit for cycle charging and discharging can be formed, and the assembled battery can continue to be heated until the temperature of the assembled battery reaches a normal operating temperature, so that the power battery can be used normally even in a low-temperature environment, avoiding limitations on the charging and discharging capacity of the power battery, and greatly improving the customer's experience of using a vehicle in winter.

[0007] In some embodiments, the motor includes a six-phase symmetrical motor, in which the magnitude of the current flowing into or out of the three-phase windings is always the same, and the current directions are symmetrical in pairs, so that the composite current can be made relatively small, thereby forming a relatively small composite magnetic field, and thus preventing the generation of a relatively large noise when the heating circuit is operating.

[0008] In some embodiments, in the charging circuit or discharging circuit, the spatial phase difference between the three windings connected to the three upper arms that are turned on is 120°, and the spatial phase difference between the three windings connected to the three lower arms that are turned on is 120°. In the charging circuit or discharging circuit, the spatial phase difference between the three windings connected to the three upper (lower) arms that are turned on is 120°, and the spatial phase difference between the currents flowing into (flowing out of) the three-phase windings is 120°. By making the stator magnetic field synthesized by the windings that are symmetrical in the three-phase space approach zero (about 0 to 0.5 T), it is possible to effectively suppress the vibration noise generated by the interaction between the stator magnetic field and the rotor magnetic field when the power battery heating circuit is used to heat the power battery. At the same time, by controlling the synthesized magnetic field of the currents flowing into multiple windings belonging to the same motor to 0 to 0.5 T, it is possible to prevent the motor from operating, and further to solve the problem of the rotor in the motor generating heat, thereby extending the use time of the battery self-heating.

[0009] According to a second aspect, the present application provides a power battery heating control method, which is used in the power battery heating circuit described in the first aspect, and includes sending an enable signal to control at least an upper arm of a three-phase arm in the arm circuit and a lower arm of the remaining arms having the same number of phases to be turned on, and forming a charging circuit and a discharging circuit that alternate between the power supply module, the inverter module and the drive module of the battery heating circuit.

[0010] In the technical solution of the embodiment of the present application, the control module controls at least the upper arm of a three-phase arm in an arm circuit and the lower arm of the remaining arm with the same number of phases to be turned on, and the power supply module, the inverter module and the drive module form alternating charging and discharging circuits to charge and discharge the assembled battery. In this way, a charging and discharging circuit for cyclic charging and discharging can be formed, and the assembled battery can continue to be heated until the temperature of the assembled battery reaches a normal operating temperature, so that the power battery can be used normally even in a low temperature environment, avoiding the charging and discharging capacity of the power battery being limited, and greatly improving the customer's experience of using a vehicle in winter.

[0011] In some embodiments, a heating signal is sent to the inverter module at a preset frequency to control the inverter module to alternate between the charging circuit and the discharging circuit, avoiding the problem of discharging the battery for a long time, consuming the battery, or making the motor work for a long time, causing the rotor of the motor to rotate or the stator to heat up.

[0012] In some embodiments, sending a heating signal to the inverter module at a preset frequency includes: sending a first heating signal and a second heating signal alternately to the inverter module at a preset frequency; turning on at least an upper arm of a three-phase arm in the arm circuit and a lower arm of the arm with the same number of phases among the remaining arms by the first heating signal, so that the power supply module, the inverter module and the driving module of the battery heating circuit form a charging circuit; turning on at least a lower arm of a three-phase arm and an upper arm of the arm with the same number of phases among the remaining arms by the second heating signal, so that the power supply module, the inverter module and the driving module of the battery heating circuit form a discharging circuit. Not only can it realize an effective heating function for the power battery, but it can also avoid energy loss and noise caused by long-term charging or discharging.

[0013] In some embodiments, the motor of the driving module includes a six-phase symmetric motor, and the first heating signal turns on the upper arm of the three-phase arm in the six-phase arm circuit and the lower arm of another three-phase arm, forming a charging circuit in the power supply module, inverter module, and driving module of the battery heating circuit, and the second heating signal turns on the lower arm of the three-phase arm in the six-phase arm circuit and the upper arm of the other three-phase arm, forming a discharging circuit in the power supply module, inverter module, and driving module of the battery heating circuit, and in the charging circuit or discharging circuit, the spatial phase difference of the three windings connected to the three upper arms that are turned on is 120°, and the spatial phase difference of the three windings connected to the three lower arms that are turned on is 120°. By controlling the composite magnetic field of the currents flowing into the multiple windings belonging to the same motor to 0~0.5T, the motor does not operate, and the problem of the rotor in the motor heating up can be solved, thereby extending the use time of the battery self-heating.

[0014] In some embodiments, the sending of the heating signal to the inverter module at the preset frequency includes determining whether the state of charge value of the battery pack is equal to or greater than a preset threshold, and if so, sending the heating signal to the inverter module at the preset frequency. When the SOC of the power battery is greater than the preset threshold, the current flowing through the circuit can be modulated to AC current, and the AC current can be used to heat the power battery by the internal resistance of the power battery, thereby improving the heating efficiency; when the battery SOC is equal to or less than the preset threshold, i.e., when the battery power is insufficient, the DC current can be used to generate heat in the winding to heat the power battery, thereby reducing the power consumption and improving the flexibility of the power battery heating system.

[0015] In some embodiments, the sending of a heating signal to the inverter module at a preset frequency includes obtaining an operating state of the motor, and if the operating state of the motor is a non-driving state, sending a heating signal to the inverter module at a preset frequency. By determining the operating state of the motor, it is possible to prevent the power battery from being heated when the motor is in a driving state, and to prevent the performance of a power device such as a vehicle from being affected.

[0016] In some embodiments, the sending of a heating signal to the inverter module at a preset frequency includes receiving a control signal sent by a vehicle controller, and if the control signal indicates to heat the power battery, sending a heating signal to the inverter module at a preset frequency. By receiving the control signal sent by the vehicle controller, a heating mode can be quickly entered and the power battery can be heated in a timely manner.

[0017] In some embodiments, the sending of a heating signal to the inverter module at a preset frequency includes receiving request data sent by a battery management system, and sending a heating signal to the inverter module at a preset frequency if the request data indicates that the power battery meets a heating requirement. By receiving the heating request sent by the BMS, the control module can timely control the power battery heating system to heat the power battery, and avoid affecting the use of a power device such as a vehicle.

[0018] In some embodiments, the method further includes: determining whether the temperature of the battery pack satisfies a heating stop condition, the heating stop condition including that the battery pack reaches a preset temperature or the temperature rise of the power battery is abnormal; and if so, sending a heating stop signal to the inverter module, the heating stop signal causing the inverter module to cut off the charging circuit or the discharging circuit. By setting the heating stop signal, the heating can be stopped in a timely manner after the temperature rise of the battery pack becomes abnormal or reaches a normal operating temperature, which can avoid the waste of resources and is favorable to the timely use of users.

[0019] According to a third aspect, the present application provides a power battery heating system, the system comprising a heating controller and a power battery heating circuit as described in any one of the first aspect, the heating controller being used to control the power battery heating circuit to form alternating charging and discharging circuits by sending instructions to the power battery heating circuit.

[0020] According to a fourth aspect, the present application provides a power consumer device including a power battery heating system according to the third aspect.

[0021] The above description is only an outline of the technical solution of the present application, which can be implemented in accordance with the contents of the specification, in order to make the technical means of the present application clearer, and in order to make the above and other objectives, features and advantages of the present application more clearly understandable, the following particularly cites specific embodiments of the present application to describe them. [Brief description of the drawings]

[0022] In order to more clearly explain the technical solutions of the embodiments of the present application, the following briefly introduces drawings that need to be used in the embodiments of the present application. It is obvious that the drawings described below are only some embodiments of the present application, and those skilled in the art can also obtain other drawings based on the drawings without exerting creative efforts. [Figure 1]FIG. 1 is a schematic block diagram of a power battery heating circuit according to an embodiment of the present application. [Diagram 2] FIG. 2 is a circuit diagram (discharge circuit) of a power battery heating circuit according to one embodiment of the present application. [Diagram 3] FIG. 1 is a circuit diagram of a power battery heating circuit (charging circuit) according to one embodiment of the present application. [Figure 4] 1 is a flow chart of a control method in a power battery heating scenario according to an embodiment of the present application. [Diagram 5] FIG. 2 is a schematic block diagram of a heating controller according to an embodiment of the present application. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] The following describes in detail the embodiments of the technical solution of the present application in conjunction with the drawings. The following embodiments are merely for the purpose of more clearly illustrating the technical solution of the present application, and are merely examples, and should not be used to limit the scope of protection of the present application.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art of the present application, and the terms used herein are merely for describing specific embodiments and are not intended to limit the present application, and the terms "including" and "having" and any variations thereof in the specification and claims of this application and the description of the drawings above are intended to cover the non-exclusive "including".

[0025] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are merely for distinguishing different objects, and should not be understood as indicating or implying the relative importance or implicitly specifying the number, specific order or hierarchical relationship of the technical features indicated. In the description of the embodiments of the present application, unless otherwise clearly and specifically limited, the meaning of "plurality" is two or more.

[0026] An "embodiment" referred to in this specification 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 appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art can explicitly and implicitly understand that the embodiments described in this specification can be combined with other embodiments.

[0027] In the description of the embodiments of the present application, the term "and / or" merely describes the relationship between related objects and indicates that three relationships may exist, for example, A and / or B may represent three cases: A alone, a combination of A and B, and B alone. In addition, the character " / " in this specification generally indicates that the related objects before and after are in an "or" relationship.

[0028] In describing the embodiments of the present application, the term "multiple" refers to two or more (including two); similarly, "multiple sets" refers to two or more (including two sets); and "multiple sheets" refers to two or more (including two sheets).

[0029] In the description of the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial direction", "radial direction", "circumferential direction", etc. are orientations or positional relationships shown based on the drawings, and are merely intended to easily and simply describe the embodiments of the present application, and do not indicate or imply that the described devices or elements have a specific orientation and must be configured and operated in a specific orientation, and therefore should not be understood as limitations on the embodiments of the present application.

[0030] In the description of the embodiments of the present application, unless otherwise clearly defined or limited, the technical terms "attached", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, may be a fixed connection, a removable connection, or an integral connection, may be a mechanical connection, may be an electrical connection, may be a direct connection, may be an indirect connection through an intermediate medium, may be a communication inside two elements, or may be an interactive relationship between two elements. Those skilled in the art may understand the specific meaning of the above terms in the embodiments of the present application according to the specific situation.

[0031] With the development of the times, new energy vehicles have huge market prospects due to their advantages such as environmental protection, low noise, and low usage costs, and can effectively promote energy saving and reduction of pollutant emissions, which is beneficial to the development and progress of society.

[0032] The present application has found that due to the electrochemical characteristics of the power battery, the charging and discharging capability of the power battery is significantly limited in a low-temperature environment, which seriously affects the experience of customers using a vehicle in winter. In particular, a six-phase motor (or a motor with more phases) requires more power provided by the power battery, and when the charging and discharging capability of the power battery is limited, the experience of the six-phase motor vehicle is also worse. Therefore, it is necessary to heat the power battery in a low-temperature environment so that the power battery can be used normally.

[0033] In order to improve the charging and discharging ability of the power battery in a low-temperature environment, the present application has found through research that the motor circuit can be used to heat the power battery in order to avoid unnecessary increases in costs when heating the power battery. Specifically, the motor generates heat during the working process, and the vehicle cooling system absorbs the heat from the motor windings, and then transmits the absorbed heat to the power battery to heat the power battery. However, when the battery is heated by the motor circuit, the cooling system itself consumes some heat, which greatly reduces the heating ability for the power battery. And as a battery-powered driving system, when the charging and discharging ability of the power battery is greatly limited, the power supply ability for the motor is also reduced, the heat from the motor windings is also greatly reduced, and the heating effect on the power battery is also greatly weakened, so that the power battery cannot be effectively heated.

[0034] Based on the above considerations, in order to solve the problem that the charging and discharging capacity of the power battery is greatly limited in a low temperature environment, which seriously affects the experience of customers using the vehicle in winter, the present application has, after extensive research, designed a power battery heating circuit, which includes a control module and a connection between the control module and the arm circuit of the inverter module, so that at least the upper arm of the three-phase arm in the arm circuit and the lower arm of the remaining arm with the same phase number are all controlled to be turned on, so that a charging circuit and a discharging circuit are formed that alternate between the power supply module, the inverter module and the driving module.

[0035] By using such a power battery heating circuit and installing a control module connected to the inverter module, a charging circuit or discharging circuit can be formed in the power supply module, the inverter module and the drive module by controlling the on or off of each phase arm in the arm circuit. When this charging circuit or discharging circuit is operating, a current flows through the battery pack of the power supply module, and the battery pack has a certain internal resistance and consumes a portion of the current. By converting the electrical energy into thermal energy, heat is generated and the battery pack of the power supply module can be heated.

[0036] In order to effectively heat the assembled battery, especially the assembled battery of a six-phase motor drive system, in this embodiment, the control module controls at least the upper arm of a three-phase arm in an arm circuit and the lower arm of the remaining arm having the same number of phases to be turned on, and the power supply module, the inverter module and the drive module form alternately switching charging and discharging circuits to charge and discharge the assembled battery. In this way, a charging and discharging circuit for cycle charging and discharging can be formed, and the assembled battery can continue to be heated until the temperature of the assembled battery reaches a normal operating temperature, so that the power battery can be used normally even in a low-temperature environment, avoiding the power battery's charging and discharging capacity being limited, and greatly improving the customer's experience of using a vehicle in winter.

[0037] The power battery in the embodiment of the present application may be, but is not limited to, a lithium ion battery, a lithium metal battery, a lead acid battery, a nickel cadmium battery, a nickel hydrogen battery, a lithium sulfur battery, a lithium air battery, or a sodium ion battery. From the perspective of scale, the battery in the embodiment of the present application may be, but is not limited to, a single cell, a battery module, or a battery pack. From the perspective of application scenario, the battery may be, but is not limited to, used in power devices such as automobiles and steamships. For example, the battery may be used in a power vehicle to power the motor of the power vehicle and serve as the power source of the electric vehicle. The battery may further power other power consuming devices in the electric vehicle, such as the air conditioner in the vehicle, the on-board player, etc.

[0038] In the following embodiment, for ease of explanation, the power consumption device in one embodiment of the present application is a new energy vehicle (powered vehicle) as an example.

[0039] The drive system is one of the core components of a new energy vehicle, and its drive characteristics determine the main performance index of the vehicle's running. The motor drive system of a new energy vehicle is mainly composed of an electric motor (i.e., motor), a motor controller, various detection sensors, a power supply module, and other parts. A motor is a rotating electromagnetic machine that operates using the principle of electromagnetic induction and is used to realize the conversion of electrical energy into mechanical energy. During operation, it absorbs power from the power supply module and outputs mechanical power to the mechanical system.

[0040] The battery pack of the power supply module may be heated by the power battery heating circuit according to the embodiment of the present application so that the power battery can be used normally in a low-temperature environment.

[0041] Based on some embodiments of the present application, with reference to FIG. 1 and further with reference to FIG. 2 and FIG. 3, FIG. 1 is a modularized schematic diagram of a power battery heating circuit according to some embodiments of the present application, FIG. 2 is a structural schematic diagram in which the power battery heating circuit according to some embodiments of the present application forms a discharge circuit, and FIG. 3 is a structural schematic diagram in which the power battery heating circuit according to some embodiments of the present application forms a charge circuit. The present application provides a power battery heating circuit, which includes a power supply module 210, an inverter module 220, a driving module 230, and a control module 240. The power supply module 210 includes at least one assembled battery. The inverter module 220 is connected to the power supply module 210 and includes an M-phase arm circuit, and the arm circuit is connected in parallel with the assembled battery, where M is an even multiple of 3. The driving module 230 includes a motor having M windings, and the M windings are respectively connected in one-to-one correspondence with the M-phase arms of the arm circuit. The control module 240 is connected to the arm circuit and controls at least an upper arm of a three-phase arm in the arm circuit and a lower arm of the remaining arms having the same number of phases to be turned on, thereby forming a charging circuit and a discharging circuit that are alternately switched between the power supply module 210, the inverter module 220, and the drive module 230, thereby charging and discharging the assembled battery.

[0042] The power supply module 210 is realized by adopting a power battery and includes at least one assembled battery. The assembled battery may be a collection of a plurality of battery modules, or a battery module including a plurality of cells.

[0043] The inverter module 220 may be realized by adopting various types of switches. For example, the inverter module 220 may be realized by an inverter in a motor drive system, where the inverter may be realized by adopting an arm circuit of an insulated gate bipolar transistor (IGBT). Specifically, the number of arms of the arm circuit and the number of windings in the drive module 230 are the same, and there are at least six phases. For example, the drive module 230 includes a six-phase motor, and the arm circuit includes six phase arms, which may include an A-phase arm, a B-phase arm, a C-phase arm, a D-phase arm, an E-phase arm, and an F-phase arm, and may include two U-phase arms, two V-phase arms, and two W-phase arms. Here, each phase arm has an upper arm and a lower arm, and a switch unit is installed in the upper arm and the lower arm, respectively.

[0044] The driving module 230 may specifically include an M-phase winding connected to an arm, where the multiple windings are connected to the same line and have a common connection point, and the ends of each winding away from the common connection point are respectively connected to the connection points of the upper arm and the lower arm of the one-phase arm.

[0045] The control module 240 sends a heating signal (i.e., an enable signal) to the inverter module 220, and the heating signal can control the switch units of the upper arm and the lower arm, thereby controlling the on / off of the upper arm or the lower arm. The control module 240 may be a vehicle control unit (VCU) and / or a motor control unit (MCU), or may be a dedicated controller installed separately to control the arm circuits to form a charging / discharging circuit, and the embodiment is not specifically limited thereto.

[0046] The battery pack, the M-phase arm, and the motor are connected in parallel, and the upper and lower arm connection points of the M-phase arm are connected in one-to-one correspondence to the M-phase windings of the M-phase motor, respectively. The control module 240 controls the on / off of the upper and lower arms of the arm circuit to alternately switch between the charging circuit and the discharging circuit and cause a current to flow inside the power supply module 210, thereby generating heat and heating the power supply module 210.

[0047] Here, the motor may specifically be a six-phase symmetric motor. The spatial phase difference of M windings of the symmetric motor may be in the ratio of 360° to M. Therefore, the spatial phase difference of the six windings of the six-phase symmetric motor is 60°.

[0048] The magnetomotive force of a single-phase winding is a pulsating magnetomotive force that is distributed in a stepped manner in space and alternates over time according to the law of change of the current. When the magnetomotive forces of the six single-phase windings in a six-phase motor are superimposed, it becomes the composite magnetic field of the six-phase windings. The larger the value of the composite magnetic field, the stronger the vibration of the motor and the louder the vibration noise.

[0049] When a six-phase symmetrical motor is adopted, the arm circuit of the inverter module 220 also includes six phase arms accordingly, and when forming a charging circuit or a discharging circuit, the control module 240 controls the upper arm of any three-phase arm among the six phase arms to be turned on, and the lower arm of the other three-phase arm to be turned on, and the current enters from three of the six windings and exits from the other three. For a six-phase symmetrical motor, the magnitude of the current flowing into or out of the three-phase windings is always the same, and the current direction is symmetrical by two, so that the composite current can be made relatively small, thereby forming a relatively small composite magnetic field, and avoiding the generation of a relatively large noise when the heating circuit is operating.

[0050] It should be noted that the driving module 230 is not limited to a six-phase motor, but may also be a twelve-phase motor or other motors larger than six phases, etc. Correspondingly, the inverter module 220 may include three-phase arms or six-phase arms, and the number of upper arms and the number of lower arms turned on each time are the same.

[0051] Furthermore, when the motor is a six-phase symmetrical motor, in the charging circuit or discharging circuit, the spatial phase difference between the three windings (which may be referred to as first windings) respectively connected to the three-phase upper arms that are turned on is 120°, and the spatial phase difference between the three windings (which may be referred to as second windings) respectively connected to the three lower arms that are turned on is 120°.

[0052] In the charging circuit or discharging circuit, the spatial phase difference of the three windings connected to the three-phase upper (lower) arms that are turned on is 120°, and the spatial phase difference of the current flowing into (flowing out of) the three-phase windings is 120°. By making the stator magnetic field synthesized by the three-phase spatially symmetrical windings approach zero (about 0-0.5T), it is possible to effectively suppress the vibration noise generated by the interaction of the stator magnetic field and the rotor magnetic field when the power battery is heated using this power battery heating circuit. At the same time, by controlling the synthesized magnetic field of the currents flowing into multiple windings belonging to the same motor to 0-0.5T, the motor does not operate, and the problem of the rotor in the motor generating heat can be solved, thereby extending the use time of the battery self-heating.

[0053] In the following, in conjunction with FIG. 2 and FIG. 3, a circuit diagram of a power battery heating circuit according to an embodiment of the present application will be described in detail.

[0054] 2, the six windings of the six-phase motor may be divided into a first winding and a second winding, the first windings being the windings 311, 312, and 313 in the six-phase motor, and the second windings being the windings 314, 315, and 316 in the six-phase motor. The six-phase arms may include arms 331-336, where the arms 331, 332, and 333 are connected in one-to-one correspondence with the windings 311, 312, and 313 in the first winding, respectively. The arms 334, 335, and 336 are connected in one-to-one correspondence with the windings 314, 315, and 316 in the second winding, respectively.

[0055] Specifically, the connection point between the upper arm 3311 and the lower arm 3312 of arm 331 is connected to one end of winding 311, the connection point between the upper arm 3321 and the lower arm 3322 of arm 332 is connected to one end of winding 312, the connection point between the upper arm 3331 and the lower arm 3332 of arm 333 is connected to one end of winding 313, the connection point between the upper arm 3341 and the lower arm 3342 of arm 334 is connected to one end of winding 314, the connection point between the upper arm 3351 and the lower arm 3352 of arm 335 is connected to one end of winding 315, and the connection point between the upper arm 3361 and the lower arm 3362 of arm 336 is connected to one end of winding 316.

[0056] The power supply module 210, the upper arm 3311-3331, the windings 311-313, the windings 314-316, and the lower arm 3342-3362 together form a discharge circuit, as shown in Fig. 2. Similarly, the power supply module 210, the lower arm 3312-3332, the windings 311-313, the windings 314-316, and the upper arm 3341-3361 together form a charge circuit, as shown in Fig. 3. Here, under the control of the control module 240, the charge circuit and the discharge circuit are turned on alternately and periodically.

[0057] 2 and 3, the spatial phase difference between the current flowing into the three windings 311-313 is controlled to 120°, and the spatial phase difference between the current flowing out of the three windings 314-316 is controlled to 120°, so that when the six-phase motor circuit is used to heat the power battery, the vibration noise of the motor can be effectively suppressed. And, the power battery heating system according to the embodiment of the present application does not operate the motor, so that the problem of the rotor in the motor heating up can be solved, thereby extending the service life of the battery self-heating.

[0058] It should be noted that the windings 311-313 may be input windings and the windings 314-316 may be output windings. Alternatively, the windings 311-313 may be output windings and the windings 314-316 may be input windings. By ensuring that the upper arm of the three-phase arm connected to the windings 311-313 and the lower arm of the three-phase arm connected to the windings 314-316 simultaneously maintain the switch unit on or off, and that the lower arm of the three-phase arm connected to the windings 311-313 and the upper arm connected to the windings 314-316 simultaneously maintain the switch unit on or off, the discharge circuit shown in FIG. 2 and the charge circuit shown in FIG. 3 can be realized.

[0059] Optionally, the power battery heating circuit shown in FIG. 2 and FIG. 3 further includes a capacitor C connected in parallel with the power supply module 210, which mainly plays the role of stabilizing the voltage and eliminating noise, etc.

[0060] Based on the same idea as the above-mentioned power battery heating circuit, an embodiment of the present application further provides a power battery heating control method applicable to the above-mentioned power battery heating circuit, which includes: sending an enable signal to control at least the upper arm of a three-phase arm in an arm circuit and the lower arm of the remaining arms having the same phase number to be turned on, so as to form an alternating charging circuit and a discharging circuit in the power supply module 210, the inverter module 220 and the driving module 230 of the battery heating circuit.

[0061] Here, the enable signal is generally a high-level or low-level digital signal used to control the on / off of an arm switch in an arm circuit. For example, a high level controls the upper arm of the arm circuit to be on and the lower arm to be cut off. When a phase arm receives a high-level enable signal sent by the control module 240, the upper arm of this phase arm is turned on and the lower arm is cut off.

[0062] In some embodiments, the control module 240 can control the inverter module 220 to alternate between a charging circuit and a discharging circuit by sending heating signals to different arms of the inverter module 220 at a preset frequency.

[0063] Here, the preset frequency, i.e., the number of times of sending the heating signal to different arms of the inverter module 220 per preset unit time, may be used to limit the time interval of sending two heating signals, that is, the control module 240 starts to count when sending a heating signal to the inverter module 220, and sends a heating signal to the inverter module 220 again after the preset time interval, and controls the inverter module 220 to alternate between the charging circuit and the discharging circuit by sending two adjacent heating signals to different arms.

[0064] If the time interval is too long, it may cause the battery to be discharged for a long time, consume the battery, and further reduce the discharge efficiency of the battery. Or it may cause the motor to work for a long time, causing the rotor of the motor to rotate or the stator to heat up. If the time interval is too long, the current passing through the battery is relatively small, and if the time is short, the heat generated may not be enough to effectively heat the battery pack. Therefore, this embodiment sets the control module 240 to send heating signals to different arms of the inverter module 220 at a preset frequency, and the preset frequency can be specifically selected according to the actual situation, thereby avoiding the time interval of sending the heating signal being too short or too long.

[0065] Specifically, when the control module 240 sends a heating signal to the inverter module 220 at a preset frequency, the control module 240 can alternately send a first heating signal and a second heating signal to the inverter module 220 at a preset frequency. The first heating signal turns on at least the upper arm of the three-phase arm in the arm circuit and the lower arm of the arm with the same number of phases among the remaining arms, so that the power supply module 210, the inverter module 220 and the driving module 230 of the battery heating circuit form a charging circuit. The second heating signal turns on at least the lower arm of the three-phase arm and the upper arm of the arm with the same number of phases among the remaining arms, so that the power supply module 210, the inverter module 220 and the driving module 230 of the battery heating circuit form a discharging circuit.

[0066] Here, the first heating signal and the second heating signal are similar to the above-mentioned enable signal, and either may be a high-level or low-level digital signal, and are used to control the on-off of the arm switch in the arm circuit, for example, a high level controls the upper arm of the arm circuit to be turned on and the lower arm to be cut off, and when a phase arm receives a high-level enable signal sent by the control module 240, the upper arm of this phase arm is turned on and the lower arm is cut off.

[0067] The control module 240 sends a first heating signal and a second heating signal to the inverter module 220 at the above-mentioned preset frequency, and respectively controls the on / off of the corresponding arms in the arm circuit, so as to make the power supply module 210, the inverter module 220 and the driving module 230 of the above-mentioned battery heating circuit alternately form a charging circuit and a discharging circuit at the corresponding frequency, which not only can realize an effective heating function for the power battery, but also can avoid energy loss and noise caused by long-term charging or discharging.

[0068] When the motor of the driving module is a six-phase symmetric motor, specifically, the first heating signal turns on the upper arm of the three-phase arm in the six-phase arm circuit and the lower arm of another three-phase arm, so that the power supply module 210, the inverter module 220 and the driving module 230 of the battery heating circuit form a charging circuit. The second heating signal turns on the lower arm of the three-phase arm in the six-phase arm circuit and the upper arm of another three-phase arm, so that the power supply module 210, the inverter module 220 and the driving module 230 of the battery heating circuit form a discharging circuit. In the charging circuit or discharging circuit, the spatial phase difference between the three windings connected to the three upper arms that are turned on is 120°, and the spatial phase difference between the three windings connected to the three lower arms that are turned on is 120°.

[0069] In the charging circuit or discharging circuit, the spatial phase difference of the three windings connected to the three-phase upper (lower) arms that are turned on is 120°, and the spatial phase difference of the current flowing into (flowing out of) the three-phase windings is 120°. By making the stator magnetic field synthesized by the three-phase spatially symmetrical windings approach zero (about 0-0.5T), it is possible to effectively suppress the vibration noise generated by the interaction of the stator magnetic field and the rotor magnetic field when the power battery is heated using this power battery heating circuit. At the same time, by controlling the synthesized magnetic field of the currents flowing into multiple windings belonging to the same motor to 0-0.5T, the motor does not operate, and the problem of the rotor in the motor generating heat can be solved, thereby extending the use time of the battery self-heating.

[0070] In some embodiments, this may include transmitting a heating signal at a preset frequency to the inverter module 220, determining whether the state of charge value of the battery pack is greater than or equal to a preset threshold, and if so, transmitting a heating signal at the preset frequency to the inverter module 220.

[0071] State of Charge (SOC) refers to the ratio of the remaining power to the rated capacity under the same conditions at a certain discharge rate of the battery. SOC is one of the important parameters of the Battery Management System (BMS) and is also the basis for the charge / discharge control policy of the entire vehicle and the battery balance operation. However, due to the complexity of the structure of the lithium battery itself, its state of charge cannot be obtained by direct measurement, and the estimation operation for SOC can only be completed using the relevant characteristic curve or calculation formula based on some external characteristics of the battery, such as the internal resistance, temperature, current, and other related parameters of the battery.

[0072] The embodiment of the present application may be used in a scenario in which a power battery with a relatively low temperature is heated. For example, the embodiment may be used in a specific scenario in which the temperature of the power battery is increased by heating the power battery, and the temperature of the battery pack reaches a temperature at which the battery pack can be normally used. Specifically, in the embodiment of the present application, when the SOC of the power battery is greater than a preset threshold, the current flowing through the circuit can be modulated to an AC current, and the AC current can be used to generate heat through the internal resistance of the power battery, thereby heating the power battery and improving the heating efficiency; when the battery SOC is equal to or less than a preset threshold, that is, when the battery power is insufficient, the DC current can be used to generate heat in the winding to heat the power battery, thereby reducing the power consumption and improving the flexibility of the power battery heating system.

[0073] Alternatively, the inverter module 220 may be controlled from the beginning to make the current flowing through the motor circuit a direct current, and the SOC of the power battery may be periodically determined. Once it is determined that the SOC of the power battery is greater than a preset threshold, the inverter module 220 may be controlled to make the current flowing through the motor circuit an alternating current, and the alternating current may be used to generate heat through the internal resistance of the power battery, thereby heating the power battery, thereby improving the heating efficiency.

[0074] Specifically, a Space Vector Pulse Width Modulation (SVPWM) algorithm can be used to modulate the current in the motor windings to DC or AC.

[0075] It should be noted that when a direct current flows through the motor windings, the radial electromagnetic force of the motor is reduced, and the eddy current loss of the rotor of the motor is reduced, thereby reducing the heat generation of the rotor, and therefore, when a direct current flows through the motor windings, the heat generation and electromagnetic vibration noise of the rotor of the motor are reduced.

[0076] In some embodiments, transmitting a heating signal to the inverter module 220 at the preset frequency may include obtaining an operating state of the motor, and transmitting a heating signal to the inverter module 220 at the preset frequency when the operating state of the motor is a non-driving state.

[0077] By determining the operating state of the motor, it is possible to prevent the power battery from heating when the motor is in a driving state, and to prevent further adverse effects on the performance of a power device such as a vehicle.

[0078] Additionally, a heating signal can be sent to this inverter module 220 when the motor is not running and there is no fault in the power battery heating system.

[0079] It should be noted that in the embodiment of the present application, the existence of a fault in the power battery heating system refers to the occurrence of a fault in any one of the power supply module 210, the driving module 230, the control module 240, the inverter module 220, the heat conduction circuit, etc. The occurrence of a fault in the heat conduction circuit includes, but is not limited to, problems such as a broken communication valve, a lack of medium in the heat conduction circuit, etc.

[0080] Alternatively, shift position information and motor revolution information may be acquired and, based on the information, it may be determined whether the motor is in a driven state or a non-driven state. Specifically, if it is determined that the current shift position is in the P range and the vehicle speed is 0, it is declared that the motor is in a non-driven state, and if it is determined that the current shift position is not in the P range or the vehicle speed is not 0, it is declared that the motor is in a driven state. If any one of the conditions is not met based on the shift position information and motor revolution information, the motor heating signal is not sent, thereby preventing the power battery from heating up when the vehicle is running normally and further affecting vehicle performance.

[0081] In some embodiments, sending a heating signal to the inverter module 220 at a preset frequency may include receiving request data sent by the battery management system, and if the request data indicates that the power battery meets a heating requirement, sending a heating signal to the inverter module 220 at the preset frequency.

[0082] By receiving the heating request sent by the BMS, the control module can timely control the power battery heating system to heat the power battery, thereby avoiding affecting the use of power devices such as vehicles.

[0083] In some embodiments, transmitting a heating signal to the inverter module 220 at the preset frequency may include receiving a control signal transmitted by a vehicle controller, and if the control signal indicates to heat the power battery, transmitting a heating signal to the inverter module 220 at the preset frequency.

[0084] In an embodiment of the present application, the control module 240 may include a vehicle control unit (VCU) and / or a motor control unit (MCU).

[0085] Optionally, when the vehicle controller receives a heating request sent by the BMS, the vehicle controller may send a control signal to the motor controller, which is used to instruct the power battery to heat up, i.e., the control signal is used to instruct the motor controller to send a heating signal to the inverter module 220. For example, the motor controller may send a first heating signal to the inverter module 220 after receiving the control signal sent by the complete vehicle controller, which is used to control the inverter module 220 to form a discharge circuit (or a charge circuit) between the power supply module 210, the inverter module 220, and the three first windings and the three second windings. After a preset time interval, the motor controller sends a second heating signal to the inverter module 220, which is used to control the inverter module 220 to form a charging circuit (or discharging circuit) between the power supply module 210, the inverter module 220, and the three first windings and the three second windings, where the current directions in the charging circuit and the discharging circuit are reversed, and the current flows in the three first windings and then flows out of the three second windings in sequence.

[0086] In some embodiments, the power battery heating control method further includes determining whether the temperature of the battery pack satisfies a heating stop condition, where the heating stop condition includes that the battery pack reaches a preset temperature or the temperature rise of the power battery is abnormal, and if so, sending a heating stop signal to the inverter module 220, and causing the inverter module 220 to cut off the charging circuit or the discharging circuit according to the heating stop signal.

[0087] Here, the preset temperature may be set to a temperature at which the battery pack can operate normally or a minimum temperature slightly higher than the normal operating temperature in order to extend the time for reheating the battery pack. The temperature rise abnormality may be that the temperature rises too fast or too slow.

[0088] By setting the heating stop signal, heating can be stopped in a timely manner after the temperature rise of the battery pack becomes abnormal or reaches a temperature at which the battery pack operates normally, thereby avoiding waste of resources and being advantageous to timely use by users.

[0089] The following describes in detail the power battery heating control method of the embodiment of the present application by taking the power battery heating circuits shown in Figures 2 and 3 as examples, and Figure 4 shows a schematic flowchart of the power battery heating control method. As shown in Figure 4, the control method includes the following steps:

[0090] S601, the BMS collects battery parameters such as temperature, SOC, voltage signal and current signal of the battery pack.

[0091] S602, the BMS determines whether the heating condition is met based on each parameter of the battery, and if so, sends a corresponding heating request to the VCU based on the SOC state, for example, sending the power required to heat the VCU to a preset temperature.

[0092] S603, the BMS or VCU determines whether the battery SOC is greater than a preset threshold.

[0093] S604, if the SOC is greater than a preset threshold, heat the power battery using heat generated by the AC current flowing through the motor circuit.

[0094] S605: If the SOC is equal to or lower than a preset threshold, the power battery is heated using heat generated by the DC current flowing through the motor circuit.

[0095] After S604, the VCU reads the current operating state of the motor.

[0096] For example, when the motor is in a driving state (i.e., in an operating state), the VCU sends a driving signal to the motor controller. At this time, the motor controller sends a periodic driving signal to the inverter module 220 to control the upper arms and lower arms of the arms 331-336 to switch on and off based on the periodic driving signal sent by the motor controller, thereby realizing inverter control of the battery current. When the motor is in a non-driving state, the VCU sends a control signal to the motor controller. At this time, the motor controller sends a first heating signal and a second heating signal to the inverter module 220 to alternately control the upper arms of the arms 331-333 and the lower arms of the arms 334-336, and the lower arms of the arms 331-333 and the upper arms of the arms 334-336 to keep switching on and off simultaneously.

[0097] Specifically, when the upper arms 3311, 3321, and 3331 of arms 331 to 333 and the lower arms 3342, 3352, and 3362 of arms 334 to 336 are turned on, and the lower arms 3312, 3322, and 3332 of arms 331 to 333 and the upper arms 3341, 3351, and 3361 of arms 334 to 336 are turned off, the battery 350 discharges and the discharge circuit is 350(+) → (3311 / 3321 / 3331) → (311 / 312 / 313) → (314 / 315 / 316) → (3342 / 3352 / 3362) → 350(-), and the current state is as shown in Figure 2. When the lower arms 3312, 3322, and 3332 of arms 331-333 and the upper arms 3341, 3351, and 3361 of arms 334-336 are turned on, and the upper arms 3311, 3321, and 3331 of arms 331-333 and the lower arms 3342, 3352, and 3362 of arms 334-336 are turned off, the battery 350 is charging and the charging circuit is 350(-)→(3312 / 3322 / 3332)→(311 / 312 / 313)→(314 / 315 / 316)→(3341 / 3351 / 3361)→350(+), and the current state is as shown in FIG. 3.

[0098] S606, the BMS judges whether the battery pack temperature is abnormal, and if so, sends temperature rise abnormality information to the VCU, and the VCU transfers the temperature rise abnormality information to the motor controller and stops heating.

[0099] If it is determined in S607 and S606 that the temperature rise is not abnormal, the BMS determines whether the battery pack temperature reaches the required level, and if so, the VCU transfers heating stop information to the motor controller and stops heating; if not, S604 / S605 and S606 are repeated.

[0100] In the power battery heating control method according to the embodiment of the present application, the control module 240 controls at least the upper arm of the three-phase arm in the arm circuit and the lower arm of the remaining arm with the same number of phases to be turned on, and the power supply module 210, the inverter module 220 and the driving module 230 form alternately switching charging and discharging circuits to charge and discharge the assembled battery, thus forming a charging and discharging circuit for cycle charging and discharging, and the assembled battery can continue to be heated until the temperature of the assembled battery reaches a normal operating temperature, so that the power battery can be used normally even in a low temperature environment, avoiding the limited charging and discharging capacity of the power battery, and greatly improving the customer's experience of using the vehicle in winter.

[0101] Based on the same idea as the above-mentioned power battery heating circuit, an embodiment of the present application further provides a power battery heating system, the system includes a heating controller and the above-mentioned power battery heating circuit, and the heating controller is used to control the power battery heating circuit to form alternating charging circuits and discharging circuits by sending instructions to the power battery heating circuit.

[0102] Specifically, the heating controller may be the vehicle controller, and the control module 240 of the power battery heating circuit may be a motor controller. It should be noted that the heating controller may be a dedicated controller that is installed separately and sends instructions to the power battery heating circuit to control the power battery heating circuit to form alternating charging and discharging circuits, and the present embodiment is not specifically limited thereto.

[0103] The power battery heating system according to the embodiment of the present application charges and discharges the assembled battery by controlling the power battery heating circuit to form a charging circuit and a discharging circuit that are alternately switched by the control module, thus forming a charging and discharging circuit for cyclic charging and discharging, and the assembled battery can continue to be heated until the temperature of the assembled battery reaches a normal operating temperature, so that the power battery can be used normally even in a low temperature environment, avoiding the charging and discharging capacity of the power battery being limited, and greatly improving the customer's experience of using the vehicle in winter.

[0104] Based on the same concept as the above power battery heating circuit, an embodiment of the present application further provides a power consuming device, which includes the above power battery heating system.

[0105] For the power consumption device according to the embodiment of the present application, the power battery heating system charges and discharges the assembled battery by controlling the power battery heating circuit to form a charging circuit and a discharging circuit that are alternately switched by the control module, thus forming a charging and discharging circuit for cyclic charging and discharging, and the assembled battery can continue to be heated until the temperature of the assembled battery reaches a normal operating temperature, so that the power battery can be used normally even in a low temperature environment, avoiding the charging and discharging capacity of the power battery being limited, and greatly improving the customer's experience of using the vehicle in winter.

[0106] Optionally, the power consumer may be a motor vehicle.

[0107] Figure 5 shows a schematic block diagram of the control module 240 of the power battery heating circuit of the embodiment of the present application. As shown in Figure 5, the control module 240 includes a processor 2420, and optionally, the control module 240 further includes a memory 2410, where the memory 2410 is used to store instructions, and the processor 2420 is used to read the instructions and execute the methods of the various embodiments of the present application described above based on the instructions.

[0108] As those skilled in the art can recognize, each example unit and algorithm step described in connection with the embodiments disclosed herein can be realized in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in a hardware manner or a software manner depends on the specific application and design constraints of the technical solution. Those skilled in the art can implement the described functions using different methods for each specific application, but such implementation should not be considered to go beyond the scope of this application.

[0109] As will be apparent to those skilled in the art, for convenience and conciseness of description, the specific operating processes of the above-described systems, devices and units may be referred to the corresponding processes in the above-described method embodiments, and will not be further described herein.

[0110] In some embodiments according to the present application, it should be understood that the disclosed systems, devices and methods may be realized in other ways. For example, the device embodiments described above are merely exemplary, and the division of units is merely a logical functional division, and in actual implementation, there may be other division ways, for example, multiple units or assemblies may be combined or integrated into another system, or some features may be omitted or not implemented. Also, the couplings or direct couplings or communication connections between the shown or discussed may be indirect couplings or communication connections through some interfaces, devices or units, which may be electrical, mechanical, or other types.

[0111] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, and may be located in one place or distributed among multiple network units, some or all of which may be selected according to actual needs to achieve the objectives of the solutions of the present embodiment.

[0112] Furthermore, each functional unit in each embodiment of the present application may be integrated into a single processing unit, each unit may exist physically alone, or two or more units may be integrated into a single unit.

[0113] When the function is realized in the form of a software functional unit and sold or used as an independent product, it may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application may be substantially embodied in the form of a software product, or a part of the technical solution or a part of the technical solution may be embodied in the form of a software product. The computer software product is stored in a storage medium and includes some instructions for making a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the method of each embodiment of the present application. The aforementioned storage medium includes various media capable of storing program codes, such as a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0114] The above is merely a specific embodiment of the present application, and the scope of protection of the present application is not limited thereto, and any changes or replacements that can be easily conceived by any person skilled in the art within the technical scope disclosed in the present application should be included in the scope of protection of the present application, and therefore the scope of protection of the present application should be consistent with the scope of protection of the claims.

Claims

1. A power battery heating circuit for heating a power battery, comprising: A power supply module including at least one battery pack; An inverter module connected to the power supply module and including an M-phase arm circuit, wherein the M-phase arm circuit is connected in parallel with the battery pack, and M = 6; A drive module including a motor having M windings, wherein the M windings are respectively connected in a one-to-one correspondence with the M-phase arms of the M-phase arm circuit; A control module connected to the M-phase arm circuit, controlling to turn on both the upper arms of the three-phase arms and the lower arms of the remaining three-phase arms in the M-phase arm circuit, and forming a charging circuit and a discharging circuit that alternately switch between the power supply module, the inverter module, and the drive module. When the state of charge value is greater than a preset threshold, the power battery is heated by an alternating current formed by the currents flowing through the charging circuit and the discharging circuit. When the state of charge value is less than or equal to the preset threshold, the power battery is heated by the heat generated in the windings by a direct current; The motor includes a six-phase symmetric motor. A power battery heating circuit characterized by this.

2. In the charging circuit or the discharging circuit, the spatial phase difference between the three upper arms that are turned on and the three windings respectively connected thereto is 120°, and the spatial phase difference between the three lower arms that are turned on and the three windings respectively connected thereto is 120°. The power battery heating circuit according to claim 1, characterized by this.

3. A power battery heating control method, comprising: Used in the power battery heating circuit according to claim 1 or 2, the power battery heating control method includes: Transmitting an enable signal, and controlling to turn on both the upper arms of at least three-phase arms and the lower arms of the arms having the same number of phases among the remaining arms in the M-phase arm circuit, and forming a charging circuit and a discharging circuit that alternately switch between the power supply module, the inverter module, and the drive module of the power battery heating circuit.

4. Controlling the inverter module to alternately switch the charging circuit and the discharging circuit by transmitting a heating signal to the inverter module at a preset frequency. The power battery heating control method according to claim 3, characterized by this.

5. Sending a heating signal to the inverter module at a preset frequency means that alternately sending a first heating signal and a second heating signal to the inverter module at a preset frequency, turning on both the upper arm of at least three-phase arms in the M-phase arm circuit and the lower arm of the arms with the same number of phases among the remaining arms by the first heating signal, and forming a charging circuit in the power supply module, inverter module and drive module of the power battery heating circuit, turning on both the lower arm of the at least three-phase arms and the upper arm of the arms with the same number of phases among the remaining arms by the second heating signal, and forming a discharging circuit in the power supply module, inverter module and drive module of the power battery heating circuit, which is characterized in that the power battery heating control method according to claim 4 includes the above steps.

6. The motor of the drive module includes a six-phase symmetric motor, turning on both the upper arm of the three-phase arms in the M-phase arm circuit and the lower arm of another three-phase arms by the first heating signal, and forming a charging circuit in the power supply module, inverter module and drive module of the power battery heating circuit, turning on both the lower arm of the three-phase arms in the M-phase arm circuit and the upper arm of the another three-phase arms by the second heating signal, and forming a discharging circuit in the power supply module, inverter module and drive module of the power battery heating circuit, In the charging circuit or discharging circuit, the spatial phase difference between the three turned-on upper arms and the three windings respectively connected thereto is 120°, and the spatial phase difference between the three turned-on lower arms and the three windings respectively connected thereto is 120°, which is characterized in that the power battery heating control method according to claim 5 includes the above steps.

7. The above-mentioned sending a heating signal to the inverter module at a preset frequency means that determining whether the state-of-charge value of the battery pack is equal to or greater than a preset threshold, if so, sending a heating signal to the inverter module at a preset frequency, which is characterized in that the power battery heating control method according to claim 4 includes the above steps.

8. The above-mentioned sending a heating signal to the inverter module at a preset frequency means that acquiring the operating state of the motor If the operating state of the motor is the non - driving state, it includes transmitting a heating signal to the inverter module at a preset frequency. The power battery heating control method according to claim 4 is characterized by this.

9. The transmitting a heating signal to the inverter module at a preset frequency includes: receiving a control signal transmitted by a vehicle controller; If the control signal instructs to heat the power battery, it includes transmitting a heating signal to the inverter module at a preset frequency. The power battery heating control method according to claim 4 is characterized by this.

10. The transmitting a heating signal to the inverter module at a preset frequency includes: receiving request data transmitted by a battery management system; If the request data indicates that the power battery satisfies the heating condition, it includes transmitting a heating signal to the inverter module at a preset frequency. The power battery heating control method according to claim 4 is characterized by this.

11. Determining whether the temperature of the battery pack satisfies the heating stop condition, where the heating stop condition includes that the battery pack reaches a preset temperature or the temperature rise of the power battery is abnormal; If so, transmitting a heating stop signal to the inverter module, and further including blocking the charging circuit or the discharging circuit of the inverter module by the heating stop signal. The power battery heating control method according to claim 3 is characterized by this.

12. A power battery heating system, including a heating controller and the power battery heating circuit according to claim 1 or 2, wherein the heating controller is used to control the power battery heating circuit to form an alternately switched charging circuit and discharging circuit by transmitting an instruction to the power battery heating circuit. The power battery heating system is characterized by this.

13. An electric power consuming device, including the power battery heating system according to claim 12. The electric power consuming device is characterized by this.

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