CN114590172A

CN114590172A - Battery energy processing device and method and vehicle

Info

Publication number: CN114590172A
Application number: CN202011416557.5A
Authority: CN
Inventors: 闫磊; 高文; 黄伟; 张俊伟; 黄丹丹
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2020-12-04
Filing date: 2020-12-04
Publication date: 2022-06-07

Abstract

The application provides a battery energy processing device, a method thereof and a vehicle, wherein the battery energy processing device comprises a conversion device; a motor winding; a first capacitor and a first switch connected in series; a second switch; a second capacitor and a third switch connected in series; and a controller that controls the converter, the first switch, the second switch, and the third switch to cause the battery energy processing device to: in a driving state; alternatively, the battery is charged; alternatively, heating of the battery; alternatively, the battery is heated while charging the battery. When controlled elements of the battery energy processing device are controlled, different loops can be formed, different functions are realized, the utilization efficiency of the motor is further improved, the integration level of the whole vehicle is improved, and the purpose of reducing the cost is achieved.

Description

Battery energy processing device and method and vehicle

Technical Field

The application relates to the field of batteries, in particular to a battery energy processing device and method and a vehicle.

Background

The performance of the battery is related to the temperature of the battery, for example, the performance of the battery in a low temperature environment is greatly reduced compared with the normal temperature. For example, when the temperature is zero, the charge/discharge capacity of the battery decreases with a decrease in the temperature, and in some regions, the time during which the temperature is zero or less is long, and it is necessary to design a heating device for the battery in order to use the battery in a low-temperature environment, that is, to promote a new energy vehicle in a low-temperature region or season.

Disclosure of Invention

The battery energy processing device can realize driving, charging, battery heating or heating while charging according to working condition requirements; another object of the present invention is to provide a control method based on a battery energy processing apparatus; it is still another object of the present invention to provide a battery-based energy management apparatus and a vehicle employing the battery-based energy management apparatus control method.

A first aspect of the present application provides a battery energy processing apparatus, comprising:

the first junction end of the conversion device is connected with the positive pole of the battery, and the second junction end of the conversion device is connected with the negative pole of the battery;

the motor winding comprises an N-phase winding, and the first end of the N-phase winding is connected with the midpoint end of the conversion device;

the first end of the first capacitor and the first end of the first switch which are connected in series are connected with the second end of the M-phase winding in the N-phase winding, the second end of the first capacitor and the second end of the first switch which are connected in series are connected with the second bus end of the conversion device, the first end of the first capacitor, which is led out by the battery energy processing device, serves as a charging positive terminal, and the second end of the first capacitor, which is led out by the battery energy processing device, serves as a charging negative terminal;

a second switch, a first end of the second switch is connected to a second end of the M-phase winding of the N-phase windings, and a second end of the second switch is connected to a second end of the P-phase winding of the N-phase windings; wherein M + P is less than or equal to N;

a second capacitor and a third switch which are connected in series, wherein the first ends of the second capacitor and the third switch which are connected in series are connected with the second end of the P-phase winding in the N-phase winding, and the second ends of the second capacitor and the third switch which are connected in series are connected with the second bus end of the conversion device;

a controller that controls the conversion device, the first switch, the second switch, and the third switch to cause the battery energy processing device to:

receiving the electric energy of the battery to enable a motor corresponding to the motor winding to be in a driving state; or,

receiving the electric energy of the external charging equipment and transmitting the electric energy to the battery; or,

charging and discharging the battery to effect heating of the battery; or,

the electric energy of the external charging equipment is received and transmitted to the battery, and meanwhile, the battery is charged and discharged so that the battery can be heated.

This application battery energy processing apparatus stands separately motor winding and integrative through the second switch, connect the switch and the electric capacity of establishing ties respectively at motor winding by two parts that are separated, at controllable component conversion equipment, first switch, second switch and third switch are when being controlled, can make the battery, motor winding, first electric capacity, second electric capacity and external charging equipment form different return circuits, realize different functions, like driving function, battery self-heating function, battery charging function, battery self-heating function while charging, further improve the utilization efficiency of motor, promote whole car integrated level, above-mentioned function has been realized with lower cost. Meanwhile, different paths can be provided when the battery self-heating function and the battery charging function are realized, the variable power charging, the variable power battery self-heating and the self-heating with different powers while charging are realized through the stepped adjustment of the motor power, the charging and self-heating performances are further improved, the charging and self-heating functions can be redundant, and the system reliability is improved.

A second aspect of the present application provides a control method for a battery energy processing apparatus, the battery energy processing apparatus including a converter, a first bus terminal of the converter being connected to a positive electrode of the battery, a second bus terminal of the converter being connected to a negative electrode of the battery;

the control method of the battery energy processing device comprises the following steps:

controlling the converting means, the first switch, the second switch, and the third switch to cause the battery energy processing means to:

charging and discharging the battery to effect heating of the battery; or,

Preferably, the controlling the conversion device, the first switch, the second switch, and the third switch to enable the battery energy processing device to receive the electric energy of the battery, and enabling the motor corresponding to the motor winding to be in a driving state specifically includes:

controlling the first switch, the third switch to be switched off and the second switch to be switched on, so that the battery and the motor winding form a driving circuit; and controlling the conversion device to enable the battery to provide required current for the motor winding, wherein the motor corresponding to the motor winding is in a driving state.

Preferably, the controlling the conversion device, the first switch, the second switch, and the third switch to enable the battery energy processing device to receive the electric energy of the external charging device and transmit the electric energy to the battery specifically includes:

controlling the third switch to be opened and the first switch and the second switch to be closed, so that the battery, the battery energy processing device and the external charging equipment form a charging circuit; and controlling the conversion device to enable the battery energy processing device to receive the electric energy of the external charging equipment and transmit the electric energy to the battery.

Preferably, the controlling the conversion device, the first switch, the second switch, and the third switch to charge and discharge the battery energy processing device and the battery to heat the battery specifically includes:

controlling the third switch to be opened and the first switch and the second switch to be closed, so that the battery, the N-phase winding and the first capacitor form a first self-heating circuit; and controlling the inverter device to charge and discharge the battery to effect heating of the battery.

controlling the first switch to be switched off, and the second switch and the third switch to be switched on, so that the battery, the N-phase winding and the second capacitor form a second self-heating circuit; and controlling the inverter device to charge and discharge the battery to effect heating of the battery.

controlling the first switch, the second switch and the third switch to be closed, so that the battery, the N, the first capacitor and the second capacitor form a third self-heating circuit; and controlling the inverter device to charge and discharge the battery to effect heating of the battery.

controlling the second switch to be opened and the first switch and the third switch to be closed, so that the battery, the M-phase winding and the first capacitor in the N-phase winding and the P-phase winding and the second capacitor in the N-phase winding form a fourth self-heating circuit; and controlling the inverter device to charge and discharge the battery to effect heating of the battery.

controlling the first switch, the second switch to be switched off and the third switch to be switched on, so that the battery, the P-phase winding of the N-phase winding and the second capacitor form a fifth self-heating circuit; and controlling the inverter device to charge and discharge the battery to effect heating of the battery.

controlling the second switch, the third switch to be switched off and the first switch to be switched on, so that the battery, the M-phase winding of the N-phase winding and the first capacitor form a sixth self-heating circuit; and controlling the inverter device to charge and discharge the battery to effect heating of the battery.

controlling the first switch, the third switch to be opened and the second switch to be closed, so that the battery and the N-phase winding form a seventh self-heating circuit; and controlling the inverter device to charge and discharge the battery to effect heating of the battery.

controlling the first switch, the second switch and the third switch to be switched off, so that the battery and a P-phase winding in the N-phase winding form an eighth self-heating circuit; and controlling the inverter device to charge and discharge the battery to effect heating of the battery.

Preferably, the controlling the converting means, the first switch, the second switch and the third switch to enable the battery energy processing means to receive the electric energy of the external charging device and transmit the electric energy to the battery, and simultaneously, charge and discharge the electric energy with the battery to heat the battery specifically includes:

controlling the second switch to be opened and the first switch and the third switch to be closed, so that the battery, the M-phase winding of the N-phase windings and the external charging equipment form a charging circuit, and the battery, the P-phase winding of the N-phase windings and the second capacitor form a fifth self-heating circuit;

and controlling the conversion device to enable the battery energy processing device to receive the electric energy of the external charging equipment, transmit the electric energy to the battery, and enable the battery to be charged and discharged to realize heating of the battery.

controlling the second switch, the third switch to be opened and the first switch to be closed, so that the battery, the M-phase winding of the N-phase windings and the external charging equipment form a charging circuit, and the battery, the P-phase winding of the N-phase windings form an eighth self-heating circuit;

According to the control method of the battery energy processing device, the motor winding is separated and integrated based on the second switch of the battery energy processing device, the two separated parts of the motor winding are respectively connected with the switch and the capacitor which are connected in series, and the battery, the motor winding, the first capacitor, the second capacitor and the external charging equipment form different loops by controlling the controllable elements such as the conversion device, the first switch, the second switch and the third switch, so that different functions are realized, such as a driving function, a battery self-heating function, a battery charging function and a battery charging and self-heating function, the utilization efficiency of the motor is further improved, the integration level of the whole vehicle is improved, and the functions are realized with lower cost. Meanwhile, different paths can be provided for realizing the self-heating function of the battery and the charging function of the battery by controlling the first switch, the second switch and the third switch, so that the power of the motor can be adjusted in a graded manner, the self-heating of the battery with variable power and the self-heating of the battery with variable power can be realized, the self-heating performance of the battery with variable power and the self-heating of different powers can be realized while charging, the charging and self-heating performances can be further improved, the redundancy of the charging and self-heating functions can be realized, and the reliability of the system can be improved.

The first aspect of the application provides a vehicle, which comprises a battery, and also comprises the battery energy processing device in the above scheme and the control method of the battery energy processing device in the above scheme.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

FIG. 1 is a schematic diagram of the battery energy management device of the present application;

fig. 2 is a schematic structural view of the vehicle of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

In order to explain the technical means of the present application, the following description will be given by way of specific examples.

The embodiment of the application provides a battery energy processing device, which is used for controlling a controllable element in the battery energy processing device based on the battery energy processing device to enable an oscillating current to flow through a battery to form battery discharging and battery charging on one hand, and the internal resistance of the battery can generate heat in the discharging and charging processes of the battery, so that the heating of the battery is realized; on the other hand, the battery is powered by an external charging device, and it can be understood that the battery heating and the battery charging may be performed simultaneously or not, which is not limited to the foregoing, and reference may be made to the following embodiments specifically; on the other hand, the battery provides electric energy for the motor corresponding to the motor winding, so that the motor is in a driving state. Specifically, as shown in fig. 1, the battery energy processing apparatus 100 is connected to a battery 110 and an external charging device 120, and the battery energy processing apparatus 100 includes a converter 1, a motor winding 2, a first capacitor 5 and a first switch 4 connected in series, a second capacitor 7 and a third switch 6 connected in series, a second switch 3, and a controller.

The inverter 1 is a controllable element and is provided with a first bus end, a second bus end and a midpoint end, wherein the first bus end is connected with the positive pole of the battery 110, the second bus end is connected with the negative pole of the battery 110 so as to connect the inverter 1 and the battery 110 together, and the midpoint end is connected with the first end of the motor winding 2 so as to connect the inverter 1 with the motor winding 2;

the motor winding 2 includes N-phase windings, which are divided into two groups including M-phase windings and P-phase windings, where M + P is equal to N. The first end of the M-phase winding and the first end of the P-phase winding jointly form the first end of the motor winding 2; the second end of the M-phase winding is connected to the first end of the first switch 4 and the first capacitor 5 connected in series, and the second end of the P-phase winding is connected to the second end of the second switch 3. The following description is specific:

the motor winding 2 comprises a first-phase motor winding, a second-phase motor winding and a third-phase motor winding; the transformation device 1 comprises a first phase bridge arm, a second phase bridge arm and a third phase bridge arm, wherein a first end of the first phase bridge arm, a first end of the second phase bridge arm and a first end of the third phase bridge arm are connected together to form a first junction end of the transformation device 1, and a second end of the first phase bridge arm, a second end of the second phase bridge arm and a second end of the third phase bridge arm are connected together to form a second junction end of the transformation device 1; the first end of the first-phase motor winding is connected with the midpoint of the first-phase bridge arm, the first end of the second-phase motor winding is connected with the midpoint of the second-phase bridge arm, the first end of the third-phase motor winding is connected with the midpoint of the third-phase bridge arm, the midpoint of the first-phase bridge arm, the midpoint of the second-phase bridge arm and the midpoint of the third-phase bridge arm form the midpoint end of the transformation device 1 together, the first end of the first-phase motor winding, the first end of the second-phase motor winding and the first end of the third-phase motor winding form the first end of the motor winding 2, the second end of the first-phase motor winding is the second end of the M-phase winding, and the second end of the second-phase motor winding and the second end of the third-phase motor winding are connected together to form the second end of the P-phase winding.

The first end of the second switch 3 is connected to the second end of the M-phase winding, i.e. the first end of the second switch 3, the second end of the M-phase winding and the first end of the first capacitor 5 and the first switch 4 connected in series are connected together.

In a specific embodiment, in order to not greatly modify the production, manufacture, etc. of the existing motor and avoid electromagnetic interference between the motor winding 2 and the second switch 3, the second switch 3 is arranged outside the housing of the motor corresponding to the motor winding 2, and the specific second switch 3 may be arranged in the power distribution box body.

In other embodiments, the N-phase windings of the motor windings 2 may be divided into three or more groups, and after the N-phase windings of the motor windings 2 are divided into more than three groups, it is understood that N is also greater than 3. Taking three groups as an example, the three groups of windings comprise an M-phase winding, a P-phase winding and a K-phase winding, wherein M + P + K is equal to N, and a first end of the M-phase winding, a first end of the P-phase winding and a first end of the K-phase winding jointly form a first end of the motor winding 2; the battery energy processing apparatus further includes a kth switch connected between the second end of the P-phase winding and the second end of the K-phase winding.

First ends of the first capacitor 5 and the first switch 4 which are connected in series are connected with a second end of the M-phase winding, and second ends of the first capacitor 5 and the first switch 4 which are connected in series are connected with a second bus end of the converter 1, wherein two ends of the first capacitor 5 are led out to be used as a charging positive terminal and a charging negative terminal which are connected with an external charging device and used for charging the battery.

The first capacitor 5 and the first switch 4 in the first capacitor 5 and the first switch 4 connected in series, in the first case, the first end of the first switch 4 forms the first end of the first switch 4 and the first capacitor 5 connected in series, the second end of the first capacitor 5 forms the second end of the first switch 4 and the first capacitor 5 connected in series, that is, the first end of the first switch 4 is connected with the second end of the M-phase winding, the second end of the first switch 4 is connected with the first end of the first capacitor 5, and the second end of the first capacitor 5 is connected with the second bus end of the inverter 1. This set position of the first switch 4 ensures a stable disconnection of the motor winding 2 from the first capacitor 5.

In the second case, as shown in fig. 2, the first end of the first capacitor 5 forms the first end of the first switch 4 and the first end of the first capacitor 5 which are connected in series, the second end of the first switch 4 forms the second end of the first switch 4 and the second end of the first capacitor 5 which are connected in series, that is, the first end of the first capacitor 5 is connected to the second end of the M-phase winding, the second end of the first capacitor 5 is connected to the first end of the first switch 4, and the second end of the first switch 4 is connected to the second bus end of the inverter 1. Such an arrangement position of the first switch 4 requires a low withstand voltage class of the first switch 4.

In a specific embodiment, in order to save cables and reduce cost, the second switch 3 is disposed in the housing of the motor corresponding to the motor winding 2, and meanwhile, the first switch 4 is disposed outside the housing of the motor corresponding to the motor winding 2, and the specific first switch 4 may be disposed in the power distribution box.

A first end of the second capacitor 7 and the third switch 6 which are connected in series are connected with a second end of the P-phase winding in the N-phase winding, and a second end of the second capacitor 7 and the third switch 6 which are connected in series are connected with a second bus end of the transformation device 1.

The third switch 6 and the second capacitor 7 of the series connection of the third switch 6 and the second capacitor 7 are located, in the first case, a first end of the third switch 6 forms a first end of the series connection of the third switch 6 and the second capacitor 7, a second end of the second capacitor 7 forms a second end of the series connection of the third switch 6 and the second capacitor 7, i.e. the first end of the third switch 6 is connected to the second end of the M-phase winding, the second end of the third switch 6 is connected to the first end of the second capacitor 7, and the second end of the second capacitor 7 is connected to the second bus of the inverter 1. This position of the third switch 6 ensures a stable disconnection of the motor winding 2 from the second capacitor 7.

In the second case, reference may be made to the first switch and the first capacitor connected in series as shown in fig. 2, a first end of the second capacitor 7 forms a first end of the third switch 6 and the second capacitor 7 connected in series, a second end of the third switch 6 forms a second end of the third switch 6 and the second capacitor 7 connected in series, that is, the first end of the second capacitor 7 is connected to the second end of the M-phase winding, the second end of the second capacitor 7 is connected to the first end of the third switch 6, and the second end of the third switch 6 is connected to the second bus terminal of the inverter 1. Such an arrangement position of the third switch 6 requires a low withstand voltage rating of the third switch 6.

In a specific embodiment, in order to save cables and reduce cost, the second switch 3 is arranged in the housing of the motor corresponding to the motor winding 2, meanwhile, the first switch 4 and the third switch 6 are arranged outside the housing of the motor corresponding to the motor winding 2, and the specific first switch 4 and the specific third switch 6 can be arranged in the power distribution box body.

In order to ensure the device safety of the battery energy processing device in the charging and self-heating processes and reduce the cost of the battery energy processing device, the capacitance value of the bus capacitor of the conversion device is larger than that of the first capacitor 5, and the capacitance value of the bus capacitor of the conversion device is larger than that of the second capacitor 7.

The controller is connected with the conversion device 1, the first switch 4, the second switch 3 and the third switch 6, and is used for controlling the conversion device 1, the first switch 4, the second switch 3 and the third switch 6, so that the battery energy processing device receives the electric energy of the battery 110, and the motor corresponding to the motor winding 2 is in a driving state, and how to realize the control method of the battery energy processing device in the following embodiments can refer to the description of the corresponding parts in the control method of the battery energy processing device in the following embodiments, and for the sake of brevity and clarity of the description of the application, the description is omitted here; or, the battery energy processing apparatus of the present application receives the electric energy of the external charging device and transmits the electric energy to the battery 110, and how to implement the method may refer to the description of the corresponding part in the control method of the battery energy processing apparatus in the following embodiments, and for the sake of brevity, the description is not repeated herein; or, the battery energy processing apparatus and the battery 110 are charged and discharged to heat the battery 110, and how to implement the heating can refer to the description of the corresponding parts in the control method of the battery energy processing apparatus in the following embodiments, and for the sake of brevity, the description is not repeated herein; or, when the battery energy processing apparatus receives the electric energy of the external charging device and transmits the electric energy to the battery 110, the battery energy processing apparatus charges and discharges the electric energy with the battery 110 to heat the battery, and how to implement the method may refer to the description of the corresponding part in the control method of the battery energy processing apparatus in the subsequent embodiments.

This application battery energy processing apparatus 100 separates and integratively motor winding 2 through second switch 3, connect the switch and the electric capacity of establishing ties respectively at motor winding 2 by two parts that are separated, at controllable element conversion equipment 1, first switch 4, second switch 3 and third switch 6 when being controlled, can make battery 110, motor winding 2, first electric capacity 5, second electric capacity 7 and outside charging equipment form different return circuits, realize different functions, such as drive function, battery self-heating function, battery charging function, battery self-heating function while charging, further improve the utilization efficiency of motor, promote whole car integrated level, the cost that has realized above-mentioned function with lower. Meanwhile, different paths can be provided when the battery self-heating function and the battery charging function are realized, the variable-power charging, the variable-power battery self-heating and the self-heating with different powers while charging are realized through the stepped adjustment of the power of the motor, the charging and self-heating performances are further improved, the charging and self-heating functions can be made to be redundant with each other, and the reliability of the system is improved.

Based on the battery energy processing apparatus in the foregoing embodiment, the present application also provides a control method of a battery energy processing apparatus, including:

controlling the conversion device 1, the first switch 4, the second switch 3 and the third switch 6 to enable the battery energy processing device to receive the electric energy of the battery 110 and enable the motor corresponding to the motor winding 2 to be in a driving state; or, the battery energy processing device of the present application receives the electric energy of the external charging device and transmits the electric energy to the battery 110; alternatively, the battery energy processing apparatus of the present application is charged and discharged with the battery 110 to achieve heating of the battery 110; or, the battery energy processing device of the present application charges and discharges with the battery 110 to heat the battery while receiving the electric energy of the external charging device and transmitting the electric energy to the battery 110.

According to the control method of the battery energy processing device, the motor winding 2 is separated and integrated based on the second switch 3 of the battery energy processing device 100, the two separated parts of the motor winding 2 are respectively connected with the switch and the capacitor which are connected in series, and the battery 110, the motor winding 2, the first capacitor 5, the second capacitor 7 and external charging equipment form different loops by controlling the controllable elements such as the conversion device 1, the first switch 4, the second switch 3 and the third switch 6, so that different functions such as a driving function, a battery self-heating function, a battery charging function and a battery charging and self-heating function are realized, the utilization efficiency of the motor is further improved, the integration level of the whole vehicle is improved, and the functions are realized with lower cost. Meanwhile, different paths can be provided for realizing the self-heating function and the battery charging function of the battery by controlling the first switch 4, the second switch 3 and the third switch 6, so that the power of the motor can be regulated in a stepped manner, the self-heating of the variable-power battery and the self-heating of different powers during the charging can be realized, the charging and self-heating performances can be further improved, the charging and self-heating functions can be mutually redundant, and the reliability of the system can be improved.

Controlling the converter 1, the first switch 4, the second switch 3 and the third switch 6 to enable the battery energy processing device to receive the electric energy of the battery 110 and enable the motor corresponding to the motor winding 2 to be in a driving state specifically comprises:

and controlling the first switch 4 and the third switch 6 to be switched off, closing the second switch 3, and forming a motor driving circuit by the battery, the bus of the conversion device 1 and the N-phase winding of the conversion device 1. And then the conversion device 1 in the motor driving circuit is controlled, the battery supplies the required current to the motor winding 2 by controlling the opening and closing of the conversion device 1 and the keeping time of the opening and closing state, and the motor corresponding to the motor winding 2 is in a driving state.

Controlling the converter 1, the first switch 4, the second switch 3, and the third switch 6 to enable the battery energy processing apparatus to receive the electric energy of the external charging device 120 and transmit the electric energy to the battery specifically includes:

and controlling the second switch 3, the first switch 4 to be closed and the third switch 6 to be opened, connecting the external charging equipment 120 to two ends of the first capacitor 5 through some devices, and enabling the electric energy of the external charging equipment 120 to flow into the battery 110 through the first switch 4, the N-phase winding and the conversion device 1 to realize a charging function.

Based on the battery energy processing apparatus of the present application, the electric energy of the external charging device 120 flows into the battery 110 through the first switch 4, the N-phase winding and the converter 1 to realize the charging function, taking N ═ 3 as an example, and is described as follows:

a first circuit state: first switching tubes of the first phase bridge arm, the second phase bridge arm and the third phase bridge arm are turned off, second switching tubes of the first phase bridge arm, the second phase bridge arm and the third phase bridge arm are turned on, charging current is stored for the first phase motor winding 21, the second phase motor winding 22 and the third phase motor winding 23 through the second switching tubes of the first phase bridge arm, the second phase bridge arm and the third phase bridge arm, and neutral point potentials of the first phase bridge arm, the second phase bridge arm and the third phase bridge arm are raised continuously.

The second loop state: first switching tubes of the first phase bridge arm, the second phase bridge arm and the third phase bridge arm are switched on or off, second switching tubes of the first phase bridge arm, the second phase bridge arm and the third phase bridge arm are switched off, a first phase motor winding 21, a second phase motor winding 22 and a third phase motor winding 23 release energy, and charging current charges the power battery through the first phase motor winding 21, the second phase motor winding 22 and the third phase motor winding 23 and the first switching tubes of the first phase bridge arm, the second phase bridge arm and the third phase bridge arm; the midpoint potentials of the first phase bridge arm, the second phase bridge arm and the third phase bridge arm are reduced.

And the external equipment charges the battery pack by alternately alternating the state of the first loop and the state of the second loop.

It is understood that, in other embodiments, controlling the converter 1, the first switch 4, the second switch 3, and the third switch 6 to enable the battery energy processing device to receive the electric energy of the external charging apparatus 120 and transmit the electric energy to the battery specifically includes:

and controlling the second switch 3 and the third switch 6 to be switched off, the first switch 4 to be switched on, connecting external charging equipment to two ends of the first capacitor 5 through some devices, and enabling electric energy of the external charging equipment to flow into the battery 110 through the first switch 4, the M-phase winding and a bridge arm of the conversion device 1 connected with the M-phase winding to realize a charging function.

Based on the battery energy processing device of the present application, the electric energy of the external charging device flows into the battery 110 through the first switch 4, the M-phase winding and the arm of the converter 1 connected to the M-phase winding by taking N ═ 3 as an example to explain the charging function:

a first circuit state: the first switch tube of the first phase bridge arm is turned off, the second switch tube of the first phase bridge arm is turned on, the charging current is stored for the first phase motor winding 21 through the second switch tube of the first phase bridge arm, and the midpoint potential of the first phase bridge arm is continuously raised.

Second loop state: a first switching tube of the first-phase bridge arm is switched on or off, a second switching tube of the first-phase bridge arm is switched off, the first-phase motor winding 21 releases energy, and a charging current charges the power battery through the first-phase motor winding 21 and the first switching tube of the first-phase bridge arm; and the potential of the midpoint of the first phase bridge arm is reduced.

In a specific embodiment, controlling the converter 1, the first switch 4, the second switch 3, and the third switch 6 to charge and discharge the battery energy processing device and the battery to heat the battery specifically includes:

the first switch 4 and the second switch 3 are controlled to be closed, the third switch 6 is switched off, the battery, a bus of the conversion device 1, the N-phase winding, the first switch 4, the second switch 3 and the first capacitor 5 form a first battery self-heating circuit (a battery charging and discharging circuit, the internal resistance generates heat in the process of charging and discharging of the battery, the temperature of the battery is increased, and the purpose of self-heating of the battery is achieved), and then the conversion device 1 is controlled, and the battery is charged and discharged to achieve heating of the battery by controlling the on-off state and the on-off state holding time of the conversion device 1.

Based on the battery energy processing device of the present application, the following explains how to heat the battery by controlling the switching of the inverter 1 and the holding time of the switched state so as to charge and discharge the battery, by taking N as an example of 3:

a first circuit state: first switching tubes of the first phase bridge arm, the second phase bridge arm and the third phase bridge arm are conducted, second switching tubes of the first phase bridge arm, the second phase bridge arm and the third phase bridge arm are turned off, and the battery stores energy for the first phase motor winding 21, the second phase motor winding 22, the third phase motor winding 23 and the first capacitor 5 through the first switching tubes of the first phase bridge arm, the second phase bridge arm and the third phase bridge arm.

Second loop state: the first switching tubes of the first phase bridge arm, the second phase bridge arm and the third phase bridge arm are turned off, the second switching tubes of the first phase bridge arm, the second phase bridge arm and the third phase bridge arm are turned on, and the first phase motor winding 21, the second phase motor winding 22 and the third phase motor winding 23 store energy for the first capacitor 5.

Third loop state: first switching tubes of the first phase bridge arm, the second phase bridge arm and the third phase bridge arm are turned off, second switching tubes of the first phase bridge arm, the second phase bridge arm and the third phase bridge arm are turned on, and the first capacitor 5 stores energy for the first phase motor winding 21, the second phase motor winding 22 and the third phase motor winding 23 through the second switching tubes of the first phase bridge arm, the second phase bridge arm and the third phase bridge arm.

Fourth loop state: the first switching tubes of the first phase bridge arm, the second phase bridge arm and the third phase bridge arm are switched on or off, the second switching tubes of the first phase bridge arm, the second phase bridge arm and the third phase bridge arm are switched off, and the first phase motor winding 21, the second phase motor winding 22, the third phase motor winding 23 and the first capacitor 5 charge the battery through the first switching tubes of the first phase bridge arm, the second phase bridge arm and the third phase bridge arm.

By alternating the first loop state and the second loop state, the battery 110 charges the first capacitor 5; by alternating the third loop state with the fourth loop state, the first capacitor 5 charges the battery 110. Through the periodic switching of the first loop state, the second loop state, the third loop state and the fourth loop state, current (or energy) is circularly charged and discharged between the battery and the first capacitor, and the oscillation heating of the battery pack is completed.

the first switch 4 is controlled to be opened, the second switch 3 and the third switch 6 are controlled to be closed, the battery, a bus of the conversion device 1, the N-phase winding, the first switch 4, the third switch 6 and the second capacitor 7 form a second battery self-heating circuit (a battery charging and discharging circuit, the internal resistance of the battery generates heat in the charging and discharging process, the temperature of the battery is increased, and the purpose of self-heating of the battery is achieved), and then the conversion device 1 is controlled, and the battery is charged and discharged to achieve heating of the battery by controlling the opening and closing of the conversion device 1 and the keeping time of the opening and closing state.

a first circuit state: first switching tubes of the first phase bridge arm, the second phase bridge arm and the third phase bridge arm are connected, second switching tubes of the first phase bridge arm, the second phase bridge arm and the third phase bridge arm are disconnected, and the battery stores energy for the first phase motor winding 21, the second phase motor winding 22, the third phase motor winding 23 and the second capacitor 7 through the first switching tubes of the first phase bridge arm, the second phase bridge arm and the third phase bridge arm.

The second loop state: the first switching tubes of the first phase bridge arm, the second phase bridge arm and the third phase bridge arm are turned off, the second switching tubes of the first phase bridge arm, the second phase bridge arm and the third phase bridge arm are turned on, and the first phase motor winding 21, the second phase motor winding 22 and the third phase motor winding 23 store energy for the second capacitor 7.

Third loop state: the first switching tubes of the first phase bridge arm, the second phase bridge arm and the third phase bridge arm are turned off, the second switching tubes of the first phase bridge arm, the second phase bridge arm and the third phase bridge arm are turned on, and the second capacitor 7 stores energy for the first phase motor winding 21, the second phase motor winding 22 and the third phase motor winding 23 through the second switching tubes of the first phase bridge arm, the second phase bridge arm and the third phase bridge arm.

Fourth loop state: the first switching tubes of the first phase bridge arm, the second phase bridge arm and the third phase bridge arm are switched on or off, the second switching tubes of the first phase bridge arm, the second phase bridge arm and the third phase bridge arm are switched off, and the first phase motor winding 21, the second phase motor winding 22, the third phase motor winding 23 and the second capacitor 7 charge the battery through the first switching tubes of the first phase bridge arm, the second phase bridge arm and the third phase bridge arm.

By alternating the first loop state and the second loop state, the battery 110 charges the second capacitor 7; the second capacitor 7 charges the battery 110 by alternating the third loop state with the fourth loop state. Through the periodic switching of the first loop state, the second loop state, the third loop state and the fourth loop state, current (or energy) is circularly charged and discharged between the battery and the first capacitor, and the oscillation heating of the battery pack is completed.

When a first capacitor in the self-heating of the first battery fails, the first capacitor can be replaced by a second capacitor in the self-heating of the second battery, and conversely, when a second capacitor in the self-heating of the second battery fails, the first capacitor in the self-heating of the first battery can be used for replacement, so that functional redundancy is realized.

the first switch 4, the second switch 3 and the third switch 6 are controlled to be closed, the battery, a bus of the conversion device 1, the N-phase winding, the first switch 4, the second switch 3, the first capacitor 5, the third switch 6 and the second capacitor 7 form a third battery self-heating circuit (a battery charging and discharging circuit, and in the charging and discharging process of the battery, internal resistance generates heat to achieve temperature rise of the battery and achieve the purpose of self-heating of the battery), and then the conversion device 1 is controlled to enable the battery to be charged and discharged to achieve heating of the battery by controlling the on-off state and the holding time of the on-off state of the conversion device 1.

a first circuit state: first switching tubes of the first phase bridge arm, the second phase bridge arm and the third phase bridge arm are conducted, second switching tubes of the first phase bridge arm, the second phase bridge arm and the third phase bridge arm are turned off, and the battery stores energy for the first phase motor winding 21, the second phase motor winding 22, the third phase motor winding 23, the first capacitor 5 and the second capacitor 7 through the first switching tubes of the first phase bridge arm, the second phase bridge arm and the third phase bridge arm.

The second loop state: the first switching tubes of the first phase bridge arm, the second phase bridge arm and the third phase bridge arm are turned off, the second switching tubes of the first phase bridge arm, the second phase bridge arm and the third phase bridge arm are turned on, and the first phase motor winding 21, the second phase motor winding 22 and the third phase motor winding 23 store energy for the first capacitor 5 and the second capacitor 7.

Third loop state: first switching tubes of the first phase bridge arm, the second phase bridge arm and the third phase bridge arm are turned off, second switching tubes of the first phase bridge arm, the second phase bridge arm and the third phase bridge arm are turned on, and the first capacitor 5 and the second capacitor 7 store energy for the first phase motor winding 21, the second phase motor winding 22 and the third phase motor winding 23 through the second switching tubes of the first phase bridge arm, the second phase bridge arm and the third phase bridge arm.

Fourth loop state: first switching tubes of the first phase bridge arm, the second phase bridge arm and the third phase bridge arm are switched on or off, second switching tubes of the first phase bridge arm, the second phase bridge arm and the third phase bridge arm are switched off, and the first phase motor winding 21, the second phase motor winding 22, the third phase motor winding 23, the first capacitor 5 and the second capacitor 7 charge the battery through the first switching tubes of the first phase bridge arm, the second phase bridge arm and the third phase bridge arm.

By alternating the first loop state with the second loop state, the battery 110 charges the first capacitor 5 and the second capacitor 7; the first capacitor 5 and the second capacitor 7 charge the battery 110 by alternating the third loop state with the fourth loop state. Through the periodic switching of the first loop state, the second loop state, the third loop state and the fourth loop state, current (or energy) is circularly charged and discharged between the battery and the first capacitor, and the oscillation heating of the battery pack is completed.

The third battery self-heating circuit works in parallel through the first capacitor 5 and the second capacitor 7 to realize larger capacitor capacity, in other words, the capacity requirements of the first capacitor 5 and the second capacitor 7 can be reduced, and the purpose of reducing cost is achieved.

the second switch 3 is controlled to be switched off, the first switch 4 and the third switch 6 are controlled to be switched on, the battery, the bus of the conversion device 1, the M-phase winding, the first switch 4 and the first capacitor 5 in the conversion device 1 and the N-phase winding, and the battery, the bus of the conversion device 1, the P-phase winding, the third switch 6 and the second capacitor 7 in the conversion device 1 and the N-phase winding form a fourth battery self-heating circuit (a battery charging and discharging circuit is used for realizing the temperature rise of the battery by generating heat in the internal resistance in the charging and discharging process of the battery so as to achieve the purpose of self-heating of the battery), and then the conversion device 1 is controlled to charge and discharge the battery by controlling the on-off state of the conversion device 1 and the holding time of the on-off state of the battery.

a first circuit state: the first switching tube of the first phase bridge arm is conducted, the first switching tubes of the second phase bridge arm and the third phase bridge arm are conducted, the second switching tubes of the first phase bridge arm, the second phase bridge arm and the third phase bridge arm are turned off, the battery stores energy for the first phase motor winding 21 and the first capacitor 5 through the first switching tube of the first phase bridge arm, and meanwhile, the battery stores energy for the second phase motor winding 22, the third phase motor winding 23 and the second capacitor 7 through the first switching tubes of the second phase bridge arm and the third phase bridge arm.

The second loop state: the first switch tube of the first phase bridge arm is turned off, the first switch tubes of the second phase bridge arm and the third phase bridge arm are turned off, the second switch tube of the first phase bridge arm is conducted, the second switch tubes of the second phase bridge arm and the third phase bridge arm are conducted, and the first-phase motor winding 21 stores energy for the first capacitor 5. Meanwhile, the second phase motor winding 22 and the third phase motor winding 23 store energy for the second capacitor 7.

Third loop state: the first switching tubes of the first phase bridge arm, the second phase bridge arm and the third phase bridge arm are turned off, the second switching tube of the first phase bridge arm is turned on, the second switching tubes of the second phase bridge arm and the third phase bridge arm are turned on, the first capacitor 5 stores energy for the first phase motor winding 21 through the second switch of the first phase bridge arm, and meanwhile, the second capacitor 7 stores energy for the second phase motor winding 22 and the third phase motor winding 23 through the second switching tubes of the second phase bridge arm and the third phase bridge arm.

Fourth loop state: first switching tubes of the first phase bridge arm, the second phase bridge arm and the third phase bridge arm are switched on or off, second switching tubes of the first phase bridge arm, the second phase bridge arm and the third phase bridge arm are switched off, the first phase motor winding 21 releases energy, the first capacitor 5 charges the battery through the first switching tube of the first phase bridge arm, meanwhile, the second phase motor winding 22 and the third phase motor winding 23 release energy, and the second capacitor 7 charges the battery through the first switching tubes of the second phase bridge arm and the third phase bridge arm.

Through the alternation of the first loop state and the second loop state, the battery 110 charges the second capacitor 7 and the first capacitor 5; and through the alternation of the third loop state and the fourth loop state, the second capacitor 7 and the first capacitor 5 charge the battery 110. through the periodic switching of the first loop state, the second loop state, the third loop state and the fourth loop state, current (or energy) is circularly charged and discharged between the battery and the capacitor, and the oscillation heating of the battery pack is completed.

The fourth battery self-heating circuit works in parallel through the first capacitor 5 and the second capacitor 7 to realize larger capacitor capacity, in other words, the capacity requirements of the first capacitor 5 and the second capacitor 7 can be reduced, and the purpose of reducing cost is achieved.

the first switch 4 and the second switch 3 are controlled to be opened, the third switch 6 is controlled to be closed, the battery, a bus of the conversion device 1, a P-phase winding in the conversion device 1 and an N-phase winding, the third switch 6 and the second capacitor 7 form a fifth battery self-heating circuit (a battery charging and discharging circuit, the battery generates heat in internal resistance in the charging and discharging process, the temperature of the battery is increased, and the purpose of self-heating of the battery is achieved), and then the conversion device 1 is controlled, and the battery is charged and discharged to achieve heating of the battery by controlling the opening and closing of the conversion device 1 and the keeping time of the opening and closing state.

a first loop state: the first switching tubes of the second phase bridge arm and the third phase bridge arm are switched on, the second switching tubes of the second phase bridge arm and the third phase bridge arm are switched off, and the battery stores energy for the second phase motor winding 22, the third phase motor winding 23 and the second capacitor 7 through the first switching tubes of the second phase bridge arm and the third phase bridge arm.

The second loop state: the first switching tubes of the second phase bridge arm and the third phase bridge arm are turned off, the second switching tubes of the second phase bridge arm and the third phase bridge arm are turned on, and the second phase motor winding 22 and the third phase motor winding 23 store energy for the second capacitor 7.

Third loop state: the first switching tubes of the second phase bridge arm and the third phase bridge arm are turned off, the second switching tubes of the second phase bridge arm and the third phase bridge arm are turned on, and the second capacitor 7 stores energy for the second phase motor winding 22 and the third phase motor winding 23 through the second switching tubes of the second phase bridge arm and the third phase bridge arm.

Fourth loop state: the first switching tubes of the second phase bridge arm and the third phase bridge arm are switched on or off, the second switching tubes of the second phase bridge arm and the third phase bridge arm are switched off, the second phase motor winding 22 and the third phase motor winding 23 release energy, and the second capacitor 7 charges the battery through the first switching tubes of the second phase bridge arm and the third phase bridge arm.

By alternating the first loop state and the second loop state, the battery 110 charges the second capacitor 7; the second capacitor 7 charges the battery 110 by alternating the third loop state with the fourth loop state. Through the periodic switching of the first loop state, the second loop state, the third loop state and the fourth loop state, current (or energy) is circularly charged and discharged between the battery and the capacitor, and the oscillation heating of the battery pack is completed.

the second switch 3 and the third switch 6 are controlled to be switched off, the first switch 4 is controlled to be switched on, and the battery, a bus of the conversion device 1, an M-phase winding in the conversion device 1 and an N-phase winding, the first switch 4 and the first capacitor 5 form a sixth battery self-heating circuit (a battery charging and discharging circuit, the battery generates heat in internal resistance in the charging and discharging process, the temperature of the battery is increased, and the purpose of self-heating of the battery is achieved), so that the conversion device 1 is controlled, and the battery is charged and discharged to heat the battery by controlling the on-off state and the on-off state maintaining time of the conversion device 1.

a first circuit state: the first switch tube of the first phase bridge arm is turned on, the second switch tube of the first phase bridge arm is turned off, and the battery stores energy for the first phase motor winding 21 and the first capacitor 5 through the first switch tube of the first phase bridge arm.

The second loop state: the first switch tube of the first phase bridge arm is turned off, the second switch tube of the first phase bridge arm is turned on, and the first phase motor winding 21 and the first capacitor 5 store energy.

Third loop state: the first switch tube of the first phase bridge arm is turned off, the second switch tube of the first phase bridge arm is turned on, and the first capacitor 5 stores energy for the first phase motor winding 21 through the second switch tube of the first phase bridge arm.

Fourth loop state: the first switch tube of the first phase bridge arm is switched on or off, the second switch tube of the first phase bridge arm is switched off, and the first phase motor winding 21 and the first capacitor 5 charge the battery through the first switch tube of the first phase bridge arm.

By alternating the first loop state and the second loop state, the battery 110 charges the first capacitor 5; the first capacitor 5 charges the battery 110 by alternating the third loop state with the fourth loop state. Through the periodic switching of the first loop state, the second loop state, the third loop state and the fourth loop state, current (or energy) is circularly charged and discharged between the battery and the first capacitor 5, and the oscillation heating of the battery pack is completed.

the second switch 3 is controlled to be closed, the first switch 4 and the third switch 6 are switched off, the battery, a bus of the converter 1, the N-phase winding and the second switch 3 form a seventh battery self-heating circuit (a battery charging and discharging circuit, and the internal resistance generates heat in the charging and discharging process of the battery, so that the temperature of the battery is increased, and the purpose of self-heating of the battery is achieved), and then the converter 1 is controlled, so that the battery is charged and discharged by controlling the on-off state and the on-off state maintaining time of the converter 1, and the heating of the battery is achieved.

a first circuit state: the first switch tube of the first phase bridge arm is conducted, the second switch tubes of the second phase bridge arm and the third phase bridge arm are conducted, and the battery 110 stores energy for the first phase motor winding 21, the second phase motor winding 22 and the third phase motor winding 23.

The second loop state: the first switching tubes of the first phase bridge arm, the second phase bridge arm and the third phase bridge arm are turned off, the second switching tubes of the first phase bridge arm, the second phase bridge arm and the third phase bridge arm are turned off, and because currents on the first phase motor winding 21, the second phase motor winding 22 and the third phase motor winding 23 cannot suddenly change, the first phase motor winding 21, the second phase motor winding 22 and the third phase motor winding 23 release energy to charge the battery while freewheeling.

And the heating current is circularly charged and discharged among the first-phase motor winding 21, the second-phase motor winding 22, the third-phase motor winding 23 and the battery 110 through the alternation of the first loop state and the second loop state, so that the vibration heating of the battery pack is completed. The loss of the switching tube is further reduced by switching the bridge arms between the first loop state and the second loop state.

In order to balance the service lives of the first switching tube and the second switching tube of the first phase bridge arm, the second phase bridge arm and the third phase bridge arm, in a preferred embodiment, the third control mode in which the battery energy processing device realizes the function of self-heating of the battery further includes:

third loop state: the first switching tubes of the second phase bridge arm and the third phase bridge arm are connected, the second switching tube of the first phase bridge arm is connected, and the battery 110 stores energy for the first phase motor winding 21, the second phase motor winding 22 and the third phase motor winding 23.

Fourth loop state: the first switching tubes and the second switching tubes of the first phase bridge arm, the second phase bridge arm and the third phase bridge arm are turned off, and because currents on the first phase motor winding 21, the second phase motor winding 22 and the third phase motor winding 23 cannot suddenly change, the first phase motor winding 21, the second phase motor winding 22 and the third phase motor winding 23 release energy to charge the battery while freewheeling.

the first switch 4, the second switch 3 and the third switch 6 are controlled to be switched off, the battery, a bus of the converter 1 and a P-phase winding of the converter 1 and an N-phase winding form an eighth battery self-heating circuit (a battery charging and discharging circuit, and the battery generates heat in the charging and discharging process to realize the temperature rise of the battery and achieve the purpose of self-heating of the battery), and then the converter 1 is controlled to charge and discharge the battery by controlling the on-off state and the holding time of the on-off state of the converter 1.

a first circuit state: one first switching tube of the second phase bridge arm and the third phase bridge arm is conducted, the second switching tube of the other one of the second phase bridge arm and the third phase bridge arm is conducted (the bridge arm conducted by the first switching tube and the bridge arm conducted by the second switching tube are different bridge arms), and the battery 110 stores energy for the second phase motor winding 22 and the third phase motor winding 23.

The second loop state: the first switching tubes of the second phase bridge arm and the third phase bridge arm are turned off, the second switching tubes of the second phase bridge arm and the third phase bridge arm are turned off, and the second phase motor winding 22 and the third phase motor winding 23 release energy to charge the battery while freewheeling because the currents on the second phase motor winding 22 and the third phase motor winding 23 cannot change suddenly.

And the heating current is circularly charged and discharged between the second-phase motor winding 22, the third-phase motor winding 23 and the battery 110 through the alternation of the first loop state and the second loop state, so that the vibration heating of the battery pack is completed. The first loop state and the second loop state further reduce the loss of the switching tube through the switching of the bridge arm.

In order to balance the life of the first switching tube and the second switching tube of the second phase arm and the third phase arm, in a preferred embodiment, the fourth control mode in which the battery energy processing apparatus implements the function of self-heating of the battery further includes:

third loop state: the conducting states of the first switching tubes and the second switching tubes of the third phase bridge arm and the second phase bridge arm are opposite to the state of the first loop, and the battery 110 stores energy for the second phase motor winding 22 and the third phase motor winding 23.

Fourth loop state: the first switching tubes of the second phase bridge arm and the third phase bridge arm are turned off, the second switching tubes of the second phase bridge arm and the third phase bridge arm are turned off, and the second phase motor winding 22 and the third phase motor winding 23 release energy to charge the battery while freewheeling because the currents on the second phase motor winding 22 and the third phase motor winding 23 cannot change suddenly.

In a specific embodiment, controlling the converter 1, the first switch 4, the second switch 3, and the third switch 6 to enable the battery energy processing device to receive the electric energy of the external charging device 120 and transmit the electric energy to the battery, and simultaneously, charging and discharging the electric energy with the battery to heat the battery specifically includes:

the second switch 3 is controlled to be switched off, the first switch 4 and the third switch 6 are controlled to be switched on, external charging equipment is connected to two ends of the first capacitor 5 through some devices, the external charging equipment, the first switch 4, the M-phase winding, a bridge arm of the conversion device 1 connected with the M-phase winding and a battery form a charging circuit, and meanwhile, the battery, a bus of the conversion device 1, a P-phase winding of the conversion device 1 and the N-phase winding, the third switch 6 and the second capacitor 7 form a fifth battery self-heating circuit. The inverter 1 is further controlled to perform a charging function by controlling the switching of the inverter 1 and the time for maintaining the switched state so that the electric power of the external charging device flows into the battery 110 through the first switch 4, the M-phase winding, and the arm of the inverter 1 connected to the M-phase winding, and to heat the battery by charging and discharging the battery.

Based on the battery energy processing device of the present application, the following explains how to control the on/off state of the converter 1 and the holding time of the on/off state by taking N ═ 3 as an example, so that the electric energy of the external charging device flows into the battery 110 through the first switch 4, the M-phase winding, and the arm of the converter 1 connected to the M-phase winding, thereby realizing the charging function, and at the same time, the battery is charged and discharged, thereby realizing the heating of the battery:

Third loop state: at least one first switching tube of the second phase bridge arm and the third phase bridge arm is conducted, the second switching tubes of the second phase bridge arm and the third phase bridge arm are turned off, and the battery stores energy for the second phase motor winding 22, the third phase motor winding 23 and the second capacitor 7 through the first switching tubes of the second phase bridge arm and the third phase bridge arm.

Fourth loop state: the first switching tubes of the second phase bridge arm and the third phase bridge arm are turned off, at least one second switching tube of the second phase bridge arm and the third phase bridge arm is turned on, and the second phase motor winding 22 and the third phase motor winding 23 store energy for the second capacitor 7.

The fifth loop state: the first switching tubes of the second phase bridge arm and the third phase bridge arm are turned off, at least one second switching tube of the second phase bridge arm and the third phase bridge arm is turned on, and the second capacitor 7 stores energy for the second phase motor winding 22 and the third phase motor winding 23 through the second switching tubes of the second phase bridge arm and the third phase bridge arm.

Sixth loop state: the first switching tubes of the second phase bridge arm and the third phase bridge arm are switched on or off, the second switching tubes of the second phase bridge arm and the third phase bridge arm are switched off, the second phase motor winding 22 and the third phase motor winding 23 release energy, and the second capacitor 7 charges the battery through the first switching tubes of the second phase bridge arm and the third phase bridge arm.

By alternating the third loop state with the fourth loop state, the battery 110 charges the second capacitor 7; the second capacitor 7 charges the battery 110 by alternating the fifth loop state with the sixth loop state. Through the periodic switching of the third loop state, the fourth loop state, the fifth loop state and the sixth loop state, current (or energy) is circularly charged and discharged between the battery and the capacitor, and the oscillation heating of the battery pack is completed.

In addition, the operation of the first loop state and the second loop state does not interfere with the operation of the third loop state, the fourth loop state, the fifth loop state and the sixth loop state. That is, when the first loop state is in progress, the first loop state may correspond to the third loop state, the fourth loop state, the fifth loop state, and the sixth loop state at the same time; similarly, the second circuit state may correspond to the third circuit state, the fourth circuit state, the fifth circuit state and the sixth circuit state.

the second switch 3 and the third switch 6 are controlled to be switched off, the first switch 4 is controlled to be switched on, external charging equipment is connected to two ends of the first capacitor 5 through some devices, the external charging equipment, the first switch 4, the M-phase winding, a bridge arm of the conversion device 1 connected with the M-phase winding and a battery form a charging circuit, and meanwhile, the battery, a bus of the conversion device 1 and a P-phase winding of the conversion device 1 and an N-phase winding form an eighth battery self-heating circuit. The inverter 1 is further controlled to perform a charging function by controlling the switching of the inverter 1 and the time for maintaining the switched state so that the electric power of the external charging device flows into the battery 110 through the first switch 4, the M-phase winding, and the arm of the inverter 1 connected to the M-phase winding, and to heat the battery by charging and discharging the battery.

The second loop state: a first switching tube of the first-phase bridge arm is switched on or off, a second switching tube of the first-phase bridge arm is switched off, the first-phase motor winding 21 releases energy, and a charging current charges the power battery through the first-phase motor winding 21 and the first switching tube of the first-phase bridge arm; and the potential of the midpoint of the first phase bridge arm is reduced.

Third loop state: one first switching tube of the second phase bridge arm and the third phase bridge arm is conducted, the second switching tube of the other one of the second phase bridge arm and the third phase bridge arm is conducted (the bridge arm conducted by the first switching tube and the bridge arm conducted by the second switching tube are different bridge arms), and the battery 110 stores energy for the second phase motor winding 22 and the third phase motor winding 23.

Fourth loop state: and because the currents on the second-phase motor winding 22 and the third-phase motor winding 23 cannot change suddenly, the second-phase motor winding 22 and the third-phase motor winding 23 release energy to charge the battery while freewheeling.

And the heating current is circularly charged and discharged between the second-phase motor winding 22 and the third-phase motor winding 23 and the battery 110 through the alternation of the third loop state and the fourth loop state, so that the vibration heating of the battery pack is completed. And the loss of the switching tube is further reduced by switching the bridge arms in the third loop state and the fourth loop state.

In order to equalize the life of the first switching tube and the second switching tube of the second phase arm and the third phase arm, in a preferred embodiment, the first control mode in which the battery energy processing apparatus implements the function of heating while charging further includes:

fifth loop state: the conducting states of the first switching tubes and the second switching tubes of the third phase bridge arm and the second phase bridge arm are opposite to the state of the first loop, and the battery 110 stores energy for the second phase motor winding 22 and the third phase motor winding 23.

Sixth loop state: the first switching tubes of the second phase bridge arm and the third phase bridge arm are turned off, the second switching tubes of the second phase bridge arm and the third phase bridge arm are turned off, and the second phase motor winding 22 and the third phase motor winding 23 release energy to charge the battery while freewheeling because the currents on the second phase motor winding 22 and the third phase motor winding 23 cannot change suddenly.

In addition, the operation of the first loop state and the second loop state does not interfere with the operation of the third loop state, the fourth loop state, the fifth loop state and the sixth loop state. That is, when the first loop state is performed, the first loop state may correspond to the third loop state, the fourth loop state, the fifth loop state, and the sixth loop state at the same time; similarly, the second loop state may correspond to the third loop state, the fourth loop state, the fifth loop state and the sixth loop state.

The application also provides a vehicle which comprises a battery 110, the battery energy processing device 100 in any embodiment of the invention and a control method based on the battery energy processing device.

In the vehicle provided by the present application, the battery energy processing apparatus 100 in any of the above embodiments may have the advantages described in the above embodiments, and the control method of the battery energy processing apparatus in any of the above embodiments may have the advantages described in the above embodiments.

In addition, in a preferred embodiment of the present application, the motor winding 2 may be a motor winding of a driving motor of a vehicle, that is, the driving motor provides driving force for vehicle running, and accordingly, the transformation device 1 may be a transformation device of the driving motor. That is, the battery energy processing device 100 provided in the present application performs charging and battery self-heating by multiplexing the driving motor of the vehicle. Because the power of driving motor is great, consequently, in the heating process, corresponding heating power is also great to can promote heating rate, improve heating efficiency. In addition, the existing driving motor on the vehicle is reused, and a special motor is not required to be additionally provided, so that the utilization rate of devices in the vehicle can be improved, the occupation of the vehicle space is reduced, the vehicle weight is reduced, the whole vehicle cost is reduced, and the popularization of a new energy automobile is facilitated.

The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.

Claims

1. A battery energy management device, comprising:

charging and discharging the battery to effect heating of the battery; or,

the electric energy of the external charging equipment is received and transmitted to the battery, and meanwhile, the battery is charged and discharged to achieve heating of the battery.

2. A control method of a battery energy processing device is characterized in that the battery energy processing device comprises a conversion device, a first junction of the conversion device is connected with a positive pole of a battery, and a second junction of the conversion device is connected with a negative pole of the battery;

the first end of the first capacitor and the first end of the first switch which are connected in series are connected with the second end of the M-phase winding in the N-phase winding, the second end of the first capacitor and the second end of the first switch which are connected in series are connected with the second bus end of the conversion device, the first end of the first capacitor is led out by the battery energy processing device to be used as a charging positive terminal, and the second end of the first capacitor is led out by the battery energy processing device to be used as a charging negative terminal;

charging and discharging with the battery to effect heating of the battery; or,

3. The method according to claim 2, wherein the controlling the converting means, the first switch, the second switch, and the third switch to enable the battery energy processing apparatus to receive the electric energy of the battery and to enable the motor corresponding to the motor winding to be in a driving state specifically comprises:

4. The method for controlling a battery energy processing apparatus according to claim 2, wherein the controlling the converting means, the first switch, the second switch, and the third switch to enable the battery energy processing apparatus to receive the electric energy of the external charging device and transmit the electric energy to the battery specifically comprises:

5. The method for controlling a battery energy processing apparatus according to claim 2, wherein the controlling the converting means, the first switch, the second switch, and the third switch to charge and discharge the battery energy processing apparatus and the battery to achieve the heating of the battery specifically comprises:

controlling the third switch to be opened and the first switch and the second switch to be closed, so that the battery, the N-phase winding and the first capacitor form a first self-heating circuit; and controlling the inverter device to charge and discharge the battery to effect heating of the battery; or,

controlling the first switch to be switched off, and the second switch and the third switch to be switched on, so that the battery, the N-phase winding and the second capacitor form a second self-heating circuit; and controlling the inverter device to charge and discharge the battery to effect heating of the battery; or,

controlling the first switch, the second switch and the third switch to be closed, so that the battery, the N, the first capacitor and the second capacitor form a third self-heating circuit; and controlling the inverter device to charge and discharge the battery to effect heating of the battery; or,

6. The method for controlling a battery energy processing apparatus according to claim 2, wherein the controlling the converting means, the first switch, the second switch, and the third switch to charge and discharge the battery energy processing apparatus and the battery to achieve the heating of the battery specifically comprises:

the seventh self-heating circuit controls the first switch, the second switch to be switched off and the third switch to be switched on, so that the battery, the P-phase winding of the N-phase winding and the second capacitor form a fifth self-heating circuit; and controlling the inverter device to charge and discharge the battery to effect heating of the battery.

7. The method for controlling a battery energy processing apparatus according to claim 2, wherein the controlling the converting means, the first switch, the second switch, and the third switch to charge and discharge the battery energy processing apparatus and the battery to achieve the heating of the battery specifically comprises:

8. The method for controlling a battery energy processing apparatus according to claim 2, wherein the controlling the converting means, the first switch, the second switch, and the third switch to charge and discharge the battery energy processing apparatus and the battery to achieve the heating of the battery specifically comprises:

controlling the first switch, the third switch to be opened and the second switch to be closed, so that the battery and the N-phase winding form a seventh self-heating circuit; and controlling the inverter device to charge and discharge the battery to effect heating of the battery; or,

9. The method according to claim 2, wherein the controlling the converting means, the first switch, the second switch, and the third switch to enable the battery energy processing apparatus to receive the electric energy from the external charging device and transmit the electric energy to the battery while charging and discharging the battery to heat the battery specifically comprises:

controlling the second switch to be opened and the first switch and the third switch to be closed, enabling the battery, an M-phase winding of the N-phase windings and the external charging equipment to form a charging circuit, and enabling the battery, a P-phase winding of the N-phase windings and the second capacitor to form a fifth self-heating circuit;

and controlling the conversion device to enable the battery energy processing device to receive the electric energy of the external charging equipment, transmit the electric energy to the battery, and enable the battery to be charged and discharged so as to heat the battery.

10. The method according to claim 2, wherein the controlling the converting means, the first switch, the second switch, and the third switch to enable the battery energy processing apparatus to receive the electric energy from the external charging device and transmit the electric energy to the battery while charging and discharging the battery to heat the battery specifically comprises:

controlling the second switch, the third switch to be switched off and the first switch to be switched on, so that the battery, an M-phase winding of the N-phase windings and the external charging equipment form a charging circuit, and the battery, a P-phase winding of the N-phase windings form an eighth self-heating circuit;

11. A vehicle including a battery, characterized by further comprising the battery energy processing apparatus of claim 1 and the control method based on the battery energy processing apparatus of claim 1 of any one of claims 2 to 10.