CN117360329A

CN117360329A - Battery self-heating device and method and electric vehicle

Info

Publication number: CN117360329A
Application number: CN202210778935.7A
Authority: CN
Inventors: 廉玉波; 凌和平; 刘俊华; 赖金富; 王滨
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2022-06-30
Filing date: 2022-06-30
Publication date: 2024-01-09

Abstract

The controller is configured to control the first control switch and the second control switch to be closed in a preset battery self-heating state, and controls the switching tube in the bridgeless PFC circuit to be opened or closed so as to charge or discharge between the bridgeless PFC circuit and the power battery, thereby realizing self-heating of the power battery. Therefore, under the condition that the electric vehicle is not in a charging state, the bridge-free PFC circuit can be utilized at any time to realize the charge and discharge with the power battery, the self-heating of the power battery is realized on the premise that excessive cost is not required to be increased, and the self-heating of the power battery can be timely performed when the power battery is in any state except the charging state and has a heating requirement, so that the full utilization of the power battery and the safety of the battery are ensured.

Description

Battery self-heating device and method and electric vehicle

Technical Field

The disclosure relates to the technical field of batteries, in particular to a battery self-heating device and method and an electric vehicle.

Background

In an electric vehicle such as an electric automobile, the temperature of a lithium ion power battery is too low in a low-temperature environment, and the battery internal resistance of the lithium ion power battery is increased along with the temperature reduction due to the reduction of the activities of a battery anode material, a battery cathode material and an electrolyte, so that the charge and discharge performance of the electric automobile is greatly reduced in the low-temperature environment. Therefore, the power battery of the electric automobile is required to be heated, so that the temperature of the body of the electric automobile is increased, and the electric automobile is ensured to be normally used under the cold condition.

In the related art, the charging and discharging between the driving motor and the power battery are realized by utilizing the inductor in the driving motor and the capacitor and the bridge arm in the motor controller, and internal resistance generates heat in the charging and discharging process to realize internal heating of the battery.

Disclosure of Invention

The purpose of the present disclosure is to provide a battery self-heating device, a method and an electric vehicle, and provide a battery self-heating device that uses a bridgeless PFC circuit to charge and discharge with a power battery, under the condition that the power battery is not in a charging state, the bridgeless PFC circuit can be used at any time to realize charging and discharging with the power battery, and under the premise of not increasing excessive cost, self-heating of the power battery is realized, and when the power battery is in any state other than the charging state and there is a power battery heating requirement, self-heating of the power battery is performed in time, thereby ensuring full utilization and safety of the power battery.

In order to achieve the above object, the present disclosure provides a battery self-heating device, the device includes a first control switch, a second control switch, a bridgeless PFC circuit and a controller, wherein a first end of the first control switch is connected with a positive electrode of a power battery, a first end of the second control switch is connected with a negative electrode of the power battery, a second end of the first control switch and a second end of the second control switch are respectively connected with two ends of the bridgeless PFC circuit, and the bridgeless PFC circuit includes a first energy storage element, a second energy storage element and a switching tube connected with the first energy storage element and/or the second energy storage element; the controller is configured to: and controlling the first control switch and the second control switch to be closed, and controlling the switching tube in the bridgeless PFC circuit to be opened or closed so as to charge or discharge the first energy storage element and/or the second energy storage element in the bridgeless PFC circuit and the power battery, thereby realizing self-heating of the power battery.

Optionally, the first energy storage element comprises a first inductor, and the switching tube comprises a first switching tube, a second switching tube, a third switching tube and a fourth switching tube; the first end of the first switch tube, the first end of the third switch tube and the first end of the second energy storage element are connected, the second end of the second switch tube, the second end of the fourth switch tube and the second end of the second energy storage element are connected to the ground, the second end of the first switch tube, the first end of the second switch tube and the second end of the first inductor are connected, the first end of the second inductor is connected with the second end of the first control switch, and the second end of the third switch tube, the first end of the fourth switch tube and the second end of the second control switch are connected; the controller is configured to: and controlling the first control switch and the second control switch to be closed, controlling the third switching tube to be opened, and controlling the fourth switching tube to be closed, and controlling the alternate on-off of the first switching tube and the second switching tube so as to charge or discharge the first inductor and/or the second energy storage element and the power battery, thereby realizing self-heating of the power battery.

Optionally, the first energy storage element further comprises a second inductor, and the switching tube further comprises a fifth switching tube and a sixth switching tube; the first end of the fifth switch tube, the first end of the first switch tube, the first end of the third switch tube and the first end of the second energy storage element are connected, the second end of the sixth switch tube, the second end of the second switch tube, the second end of the fourth switch tube and the second end of the second energy storage element are connected and grounded, the second end of the fifth switch, the first end of the sixth switch and the second end of the second inductor are connected, and the first end of the second inductor, the first end of the first inductor and the second end of the first control switch are connected; the controller is configured to: and controlling the first control switch and the second control switch to be closed, controlling the third switching tube to be opened, controlling the fourth switching tube to be closed, controlling the first switching tube and the second switching tube to be alternately switched on and off so as to charge or discharge the first inductor and/or the second energy storage element and the power battery, and controlling the fifth switching tube and the sixth switching tube to be alternately switched on and off so as to charge or discharge the second inductor and/or the second energy storage element and the power battery, wherein the switching-on states of the first switching tube and the fifth switching tube are kept consistent, and the switching-off states of the second switching tube and the sixth switching tube are kept consistent.

Optionally, the first energy storage element comprises a third inductor, and the switching tube comprises a seventh switching tube, an eighth switching tube, a ninth switching tube and a tenth switching tube; the first end of the seventh switching tube, the first end of the ninth switching tube and the first end of the second energy storage element are connected, the second end of the eighth switching tube, the second end of the tenth switching tube, the second end of the second energy storage element and the second end of the second control switch are connected and grounded, the second end of the seventh switching tube, the first end of the eighth switching tube and the second end of the third inductor are connected, the first end of the third inductor is connected with the second end of the first control switch, and the second end of the ninth switching tube and the first end of the tenth switching tube are connected; the controller is configured to: and controlling the first control switch and the second control switch to be closed, controlling the ninth switching tube and the tenth switching tube to be kept open, and controlling the alternate on-off of the seventh switching tube and the eighth switching tube so as to charge or discharge the third inductor and/or the second energy storage element and the power battery, thereby realizing self-heating of the power battery.

Optionally, the first energy storage element further comprises a fourth inductor, and the switching tube further comprises an eleventh switching tube and a twelfth switching tube; the first end of the eleventh switching tube, the first end of the seventh switching tube, the first end of the ninth switching tube and the first end of the second energy storage element are connected, the second end of the twelfth switching tube, the second end of the eighth switching tube, the second end of the second energy storage element and the second end of the second control switch are connected and grounded, the second end of the eleventh switching tube, the first end of the twelfth switching tube and the second end of the fourth inductor are connected, and the first end of the fourth inductor, the first end of the third inductor and the second end of the first control switch are connected; the controller is configured to: and controlling the first control switch and the second control switch to be closed, controlling the ninth switch tube and the tenth switch tube to be kept open, controlling the alternate on-off of the seventh switch tube and the eighth switch tube so as to charge or discharge the third inductor and/or the second energy storage element and the power battery, and controlling the alternate on-off of the eleventh switch tube and the twelfth switch tube so as to charge or discharge the fourth inductor and/or the second energy storage element and the power battery, wherein the on-off states of the seventh switch tube and the eleventh switch tube are kept consistent, and the on-off states of the eighth switch tube and the twelfth switch tube are kept consistent.

Optionally, the device further comprises a third control switch and a fourth control switch, and the first energy storage element comprises a fifth inductor, a sixth inductor and a seventh inductor; the second end of the first control switch, the first end of the third control switch, the first end of the fourth control switch and the first end of the fifth inductor are connected, the second end of the third control switch is connected with the first end of the sixth inductor, the second end of the fourth control switch is connected with the first end of the seventh inductor, the second end of the fifth inductor, the second end of the eleventh switch tube and the first end of the fourteenth switch tube are connected, the second end of the sixth inductor, the second end of the fifteenth switch tube and the first end of the sixteenth switch tube are connected, the second end of the seventh inductor, the second end of the seventeenth switch tube and the first end of the eighteenth switch tube are connected, the first end of the thirteenth switch tube, the first end of the seventeenth switch tube and the first end of the second energy storage element are connected, and the second end of the sixteenth switch tube, the second end of the second switch tube and the second end of the second energy storage element are connected in parallel; the controller is further configured to control a first control switch, the second control switch, the third control switch and the fourth control switch to be closed and control the thirteenth switching tube and the fourteenth switching tube to be alternately switched on and off under the self-heating state of the preset battery so as to charge or discharge the fifth inductor and/or the second energy storage element and the power battery; and/or, controlling the on-off of a fifteenth switch tube and a sixteenth switch Guan Jiaoti so as to charge or discharge the sixth inductor and/or the second energy storage element and the power battery; and/or controlling the alternate on-off of the seventeenth switching tube and the eighteenth switching tube so as to charge or discharge the seventh inductor and/or the second energy storage element and the power battery.

Optionally, the second energy storage element comprises a capacitor.

Optionally, the bridgeless PFC circuit comprises a single phase input bridgeless PFC circuit or a multiphase input bridgeless PFC circuit.

Optionally, the power battery is a power battery for providing power for a driving motor of an electric vehicle, and the bridgeless PFC circuit is a bridgeless PFC circuit in a charger of the electric vehicle.

Optionally, the controller is further configured to: if the temperature of the power battery is not greater than the preset temperature threshold and the charger is not started, judging that the electric vehicle is in the self-heating state of the preset battery; or if the current moment reaches the preset battery self-heating time and the charger in the electric vehicle is not started, judging that the electric vehicle is in the preset battery self-heating state; when the electric vehicle is judged to be in the self-heating state of the preset battery, the electric vehicle is in any one of a power-on state, a driving state or a power-off state.

The present disclosure also provides a battery self-heating method, the method comprising: acquiring an instruction for entering a self-heating state of a preset battery; under the self-heating state of a preset battery, the first control switch and the second control switch are controlled to be closed, and the first energy storage element and/or the second energy storage element in the bridgeless PFC circuit are/is charged or discharged with the power battery by controlling the switching tube in the bridgeless PFC circuit to be opened and closed, so that the self-heating of the power battery is realized; the first end of the first control switch is connected with the positive electrode of the power battery, the first end of the second control switch is connected with the negative electrode of the power battery, the second end of the first control switch and the second end of the second control switch are respectively connected with two ends of the bridgeless PFC circuit, and the bridgeless PFC circuit comprises a first energy storage element, a second energy storage element and a switching tube connected with the first energy storage element and/or the second energy storage element.

The present disclosure also provides an electric vehicle including the above battery self-heating device.

Through the technical scheme, the battery self-heating device for charging and discharging between the bridgeless PFC circuit and the power battery is provided, the bridgeless PFC circuit can be used for realizing charging and discharging with the power battery at any time under the condition of not being in a charging state, the self-heating of the power battery is realized on the premise of not increasing excessive cost, and the self-heating of the power battery can be timely performed under any state except the charging state and when the power battery is in a heating requirement, so that the full utilization and safety of the power battery are ensured.

Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.

Drawings

The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification, illustrate the disclosure and together with the description serve to explain, but do not limit the disclosure. In the drawings:

fig. 1 is a block diagram illustrating a structure of a battery self-heating device according to an exemplary embodiment of the present disclosure.

Fig. 2 is a block diagram illustrating a structure of a battery self-heating device according to still another exemplary embodiment of the present disclosure.

Fig. 3 is a schematic circuit diagram of a battery self-heating device according to still another exemplary embodiment of the present disclosure.

Fig. 4 is a schematic circuit diagram of a battery self-heating device according to still another exemplary embodiment of the present disclosure.

Fig. 5 is a schematic circuit diagram of a battery self-heating device according to still another exemplary embodiment of the present disclosure.

Fig. 6 is a schematic circuit diagram of a battery self-heating device according to still another exemplary embodiment of the present disclosure.

Fig. 7 is a schematic circuit diagram of a battery self-heating device according to still another exemplary embodiment of the present disclosure.

Fig. 8 is a flowchart illustrating a method of self-heating a battery according to an exemplary embodiment of the present disclosure.

Description of the reference numerals

100-battery self-heating device 200 power battery

1 first control switch 2 second control switch

3 first energy storage element of bridgeless PFC circuit 31

32 switch tube 33 second energy storage element

4 temperature detection module 5 battery self-heating prompt module

L1 first inductance L2 second inductance

L3 third inductor L4 fourth inductor

L5 fifth inductance L6 sixth inductance

L7 seventh inductance K1 first switch tube

K2 second switching tube K3 third switching tube

K4 fourth switching tube K5 fifth switching tube

K6 sixth switching tube K7 seventh switching tube

K8 eighth switching tube K9 ninth switching tube

K10 tenth switching tube K11 eleventh switching tube

K12 twelfth switching tube K13 thirteenth switching tube

K14 fourteenth switching tube K15 fifteenth switching tube

K16 sixteenth switching tube K17 seventeenth switching tube

K18 eighteenth switch tube C capacitor

6 third control switch 7 fourth control switch

Detailed Description

Specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the disclosure, are not intended to limit the disclosure.

It should be noted that, all actions for acquiring signals, information or data in the present disclosure are performed under the condition of conforming to the corresponding data protection rule policy of the country of the location and obtaining the authorization given by the owner of the corresponding device.

Fig. 1 is a block diagram illustrating a structure of a battery self-heating device according to an exemplary embodiment of the present disclosure. As shown in fig. 1, the apparatus 100 includes a first control switch 1, a second control switch 2, a bridgeless PFC circuit 3, and a controller (not shown), where a first end of the first control switch 1 is connected to a positive electrode of a power battery 200, a first end of the second control switch 2 is connected to a negative electrode of the power battery 200, and a second end of the first control switch 1 and a second end of the second control switch 2 are respectively connected to two ends of the bridgeless PFC circuit 3, and the bridgeless PFC circuit 3 includes a first energy storage element 31, a second energy storage element 33, and a switching tube 32 connected to the first energy storage element 31 and/or the second energy storage element 33; the controller is configured to control the first control switch 1 and the second control switch 2 to be closed under a preset battery self-heating state, and to control the switching tube 32 in the bridgeless PFC circuit 3 to be opened or closed so as to charge or discharge between the first energy storage element 31 and/or the second energy storage element 33 in the bridgeless PFC circuit 3 and the power battery 200, thereby realizing self-heating of the power battery 200.

The power battery 200 may be a power battery that supplies electric power to a drive motor of an electric vehicle, or may be a battery that uses, for example, a hydrogen fuel cell or the like as a power source. The electric vehicle may include an electric or hybrid electric vehicle, a ship, an airplane, etc., and will be described below mainly by way of example. The bridgeless PFC circuit 3 may be a bridgeless PFC circuit in a charger of an electric vehicle. The bridgeless PFC circuit 3 may include a single-phase input bridgeless PFC circuit or a multiphase input bridgeless PFC circuit. The specific circuit configuration of the bridgeless PFC circuit 3 is not limited in this application, as long as a charge/discharge current circuit with the power battery 200 can be realized after the first control switch 1 and the second control switch 2 are closed. The controller may be any type of controller, either a separately provided controller or a control module integrated into, for example, a vehicle control unit (Vehicle control unit, VCU). The controller is not shown in fig. 1, and in practical application, the controller may be connected to the first control switch 1, the second control switch 2 and the switching tube 32 in the bridgeless PFC circuit 3 through a low voltage line to control the switching thereof.

The first energy storage element 31, the second energy storage element 33 and the switching tube 32 included in the bridgeless PFC circuit 3 may be devices originally arranged in the bridgeless PFC circuit 3 in the charger, and the connection relationship between the devices may be set according to the requirement in the charger. In this application, the on/off of the switching tube 32 in the bridgeless PFC circuit 3 is controlled by the controller according to the requirement of the preset battery self-heating state, so that the charge-discharge loop between the first energy storage element 31 and/or the second energy storage element 33 and the power battery 200 can be realized, and the charge-discharge loop can be directly used for self-heating the battery without any adjustment of the circuit in the bridgeless PFC circuit in the charger, thereby realizing self-heating of the power battery 200 through the internal resistance of the power battery 200. The switching tube 32 may be a MOS tube or an IGBT tube, the first energy storage element 31 may be an inductor, and the second energy storage element 33 may be a capacitor with or without polarity.

The preset battery self-heating state may be any state determined that the power battery 200 needs to be heated, for example, the preset battery self-heating state may be determined when the temperature of the power battery 200 is lower than a preset temperature threshold, or the preset battery self-heating state may be determined when the temperature of the environment in which the electric vehicle is located is lower than the preset temperature threshold, or the like. In addition, when the power battery 200 is a power battery 200 for driving in an electric vehicle and the bridgeless PFC circuit 3 is a bridgeless PFC circuit 3 in a charger, the bridgeless PFC circuit 3 can be used for self-heating the power battery 200 whenever the charger in the electric vehicle is not activated, that is, a charging gun is not inserted into the electric vehicle and is not in a charging state, for example, the electric vehicle can perform self-heating of the power battery 200 when in any one of a power-on state, a driving state, and a power-off state. Thus, in one possible implementation, the controller may be further configured to: if the temperature of the power battery 200 is not greater than the preset temperature threshold and a charger in the electric vehicle is not started, determining that the electric vehicle is in the self-heating state of the preset battery; or if the current moment reaches the preset battery self-heating time and the charger in the electric vehicle is not started, judging that the electric vehicle is in the preset battery self-heating state; when the electric vehicle is judged to be in the self-heating state of the preset battery, the electric vehicle is in any one of a power-on state, a driving state or a power-off state. That is, when the bridgeless PFC circuit 3 is the bridgeless PFC circuit 3 in the charger, the condition that the controller determines whether to be in the preset battery self-heating state may include an activation state of the charger in the electric vehicle, a temperature of the power battery 200, a preset battery self-heating time, and the like. The preset battery self-heating time can be a periodic battery self-heating time set by a user, or can be a word battery self-heating time set by the user, and the like.

The temperature of the power battery 200 may be obtained by a temperature detection module 4 as shown in fig. 2, and the temperature detection module 4 may be a separate module independent of the power battery 200 as shown in fig. 2 or may be an integrated module included in the power battery 200. The temperature detection module 4 may monitor the temperature state of the power battery 200 in real time. The temperature detection module 4 may be connected to the controller, and continuously communicate with the controller, and send temperature information of the power battery 200 thereto.

Through the technical scheme, the battery self-heating device for charging and discharging between the bridgeless PFC circuit and the power battery is provided, the bridgeless PFC circuit can be used for realizing charging and discharging with the power battery at any time under the condition that the power battery is not in a charging state, the self-heating of the power battery is realized on the premise of not increasing excessive cost, and the self-heating of the power battery can be timely performed when the power battery is in any state except the charging state and the power battery is in a heating requirement, so that the full utilization and safety of the power battery are ensured.

For how the controller determines whether to be in the preset battery self-heating state in particular, several examples of the flow of the controller determining whether to be in the preset battery self-heating state are given below.

If the electric vehicle is currently in a power-on state or the electric vehicle is running through, the temperature detection module 4 in the power battery 200 is used for continuously detecting the temperature of the power battery 200, and when the temperature of the power battery 200 is not greater than a preset temperature threshold value, the current state of the power battery 200 to be charged can be directly judged, and then the first control switch 1, the second control switch 2 and the switch tube 32 in the bridgeless PFC circuit 3 are controlled by the controller to charge and discharge the power battery 200 and the bridgeless PFC circuit 3 so as to perform self-heating of the battery.

If the electric vehicle is in the current power-off state, the temperature of the power battery 200 is continuously detected by the temperature detection module 4 in the power battery 200, and when the temperature of the power battery 200 is not greater than the preset temperature threshold, whether the charger is in the on state is required to be judged firstly, specifically, whether the charger is in the on state or not can be judged by detecting the ac charging state of the charger, if the charger is in the off state, that is, the ac charging state of the charger is no, the current state of the preset battery to be charged can be judged, and then the controller controls the first control switch 1, the second control switch 2 and the switch tube 32 in the bridgeless PFC circuit 3 to charge and discharge the power battery 200 and the bridgeless PFC circuit 3 so as to perform self-heating of the battery.

In addition, in a possible embodiment, the battery self-heating device 100 may further include a battery self-heating prompt module 5 as shown in fig. 2, configured to prompt a user with sound, image, text, etc. to inform the user of the status information of the current power battery 200 after the controller determines that the electric vehicle is in the preset battery self-heating state, where the status information may include, for example, the current power battery 200 temperature and the range, the range after starting the battery self-heating, the operation advice of the driver, etc., and provide the user with options of whether to implement the battery self-heating. If the user chooses to implement the self-heating of the battery, the controller controls the first control switch 1, the second control switch 2 and the switching tube 32 in the bridgeless PFC circuit 3 to charge and discharge the power battery 200 and the bridgeless PFC circuit 3 so as to perform the self-heating of the battery.

Fig. 3 is a schematic circuit diagram of a battery self-heating device according to still another exemplary embodiment of the present disclosure. As shown in fig. 3, the first energy storage element 31 includes a first inductor L1, the switching tube 32 includes a first switching tube K1, a second switching tube K2, a third switching tube K3, and a fourth switching tube K4, and the second energy storage element 33 includes a capacitor C; the first end of the first switch tube K1, the first end of the third switch tube K3 and the first end of the second energy storage element 33 are connected, the second end of the second switch tube K2, the second end of the fourth switch tube K4 and the second end of the second energy storage element 33 are connected to the ground, the second end of the first switch tube K1, the first end of the second switch tube K2 and the second end of the first inductor L1 are connected, the first end of the second inductor L2 is connected with the second end of the first control switch 1, and the second end of the third switch tube K3, the first end of the fourth switch tube K4 and the second end of the second control switch 2 are connected; the controller is configured to: the first control switch 1 and the second control switch 2 are controlled to be closed, the third switch tube K3 is controlled to be opened, the fourth switch tube K4 is controlled to be closed, and the first inductance L1 and/or the second energy storage element 33, namely the capacitor C, and the power battery 200 are charged or discharged by controlling the alternate on-off of the first switch tube K1 and the second switch tube K2, so that the self-heating of the power battery 200 is realized.

In this embodiment, the first inductor L1, the capacitor C, the first switching tube K1, the second switching tube K2, the third switching tube K3 and the fourth switching tube K4 and the connection relationship therebetween may be the original components and the connection relationship in the bridgeless PFC circuit 3 of the charger. The bridgeless PFC circuit 3 is an example of a circuit of one-phase input. The controller connects the power battery 200 with the bridgeless PFC circuit 3 by controlling the first control switch 1 and the second control switch 2 to be closed and controls the third switching tube K3 to be opened and the fourth switching tube K4 to be closed under the self-heating state of the preset battery, so as to form the self-heating device 100 of the battery realized by the bridgeless PFC circuit 3.

The control process of self-heating of the battery in this embodiment includes the following four cycle timings.

Time sequence 1: the controller controls the first switching tube K1 to be opened, the second switching tube K2 to be closed, the power battery 200 charges the first inductor L1, the power battery 200 reduces the voltage, and the first inductor L1 increases the voltage;

time sequence 2: the controller controls the second switching tube K2 to be opened, the first switching tube K1 is closed, the power battery 200 and the first inductor L1 charge the capacitor C at the same time, the capacitor C is boosted, the first inductor L1 is stepped down, and the power battery 200 is continuously stepped down;

Time sequence 3: the on-off state of the first switch tube K1 and the second switch tube K2 is kept unchanged from the time sequence 2, at the moment, the voltage in the capacitor C rises to the highest, the current loop is reversed, the capacitor C charges the first inductor L1 and the power battery 200, the power battery 200 is boosted, the first inductor L1 is boosted, and the capacitor C is reduced;

time sequence 4: the controller controls the first switching tube K1 to be opened, the second switching tube K2 to be closed, the first inductor L1 charges the power battery 200, the first inductor L1 decreases the voltage, and the power battery 200 increases the voltage.

Fig. 4 is a schematic circuit diagram of a battery self-heating device according to still another exemplary embodiment of the present disclosure. As shown in fig. 4, on the basis of the circuit schematic diagram shown in fig. 3, the first energy storage element 31 further includes a second inductor L2, and the switching tube 32 further includes a fifth switching tube K5 and a sixth switching tube K6; the first end of the fifth switching tube K5, the first end of the first switching tube K1, the first end of the third switching tube K3 and the first end of the second energy storage element 33 are connected, the second end of the sixth switching tube K6, the second end of the second switching tube K2, the second end of the fourth switching tube K4 and the second end of the second energy storage element 33 are connected to the ground, the second end of the fifth switching tube K5, the first end of the sixth switching tube K6 and the second end of the second inductor L2 are connected, and the first end of the second inductor L2, the first end of the first inductor L1 and the second end of the first control switch 1 are connected; the controller is configured to control the first control switch 1 and the second control switch 2 to be closed, control the third switch tube K3 to be opened, control the fourth switch tube K4 to be closed, and control the alternate on/off of the first switch tube K1 and the second switch tube K2 to charge or discharge the first inductor L1 and/or the second energy storage element 33 and the power battery 200, and control the alternate on/off of the fifth switch tube K5 and the sixth switch tube K6 to charge or discharge the second inductor L2 and/or the second energy storage element 33 and the power battery 200, wherein the on/off states of the first switch tube K1 and the fifth switch tube K5 are kept consistent, and the on/off states of the second switch tube K2 and the sixth switch tube K6 are kept consistent, so as to realize self-heating of the power battery 200.

The circuit schematic diagram in this embodiment adds an energy storage element and two switching tubes on the basis of the circuit schematic diagram shown in fig. 3, and can form two parallel battery self-heating loops which are mutually independent through two inductors and/or capacitors C. In this embodiment, the first inductor L1, the second inductor L2, the capacitor C, the first switching tube K1, the second switching tube K2, the third switching tube K3, the fourth switching tube K4, the fifth switching tube K5, the sixth switching tube K6, and the connection relationships therebetween may be the original components and the connection relationships in the bridgeless PFC circuit 3 of the charger. The bridgeless PFC circuit 3 is also an example of a circuit with one-phase input, that is, the current phases input to the first inductor L1 and the second inductor L2 via the first control switch K1 are identical. The controller connects the power battery 200 with the bridgeless PFC circuit 3 by controlling the first control switch 1 and the second control switch 2 to be closed and controls the third switching tube K3 to be opened and the fourth switching tube K4 to be closed under the self-heating state of the preset battery, so as to form the self-heating device 100 of the battery realized by the bridgeless PFC circuit 3.

Time sequence 1: the controller controls the first switching tube K1 and the fifth switching tube K5 to be opened, the second switching tube K2 and the sixth switching tube K6 to be closed, the power battery 200 charges the first inductor L1 and the second inductor L2, the power battery 200 reduces the voltage, and the first inductor L1 and the second inductor L2 increase the voltage;

time sequence 2: the controller controls the second switching tube K2 and the sixth switching tube K6 to be opened, the first switching tube K1 and the fifth switching tube K5 are closed, the power battery 200, the first inductor L1 and the second inductor L2 charge the capacitor C at the same time, the capacitor C is boosted, the first inductor L1 and the second inductor L2 are stepped down, and the power battery 200 is continuously stepped down;

time sequence 3: the on-off state of the first switch tube K1, the second switch tube K2, the fifth switch tube K5 and the sixth switch tube K6 is kept unchanged from the time sequence 2, at the moment, the voltage in the capacitor C rises to the highest, the current loop is reversed, the capacitor C charges the first inductor L1, the second inductor L2 and the power battery 200, the power battery 200 boosts, the first inductor L1 and the second inductor L2 boost, and the capacitor C reduces the voltage;

time sequence 4: the controller controls the first switching tube K1 and the fifth switching tube K5 to be opened, the second switching tube K2 and the sixth switching tube K6 to be closed, the first inductor L1 and the second inductor L2 charge the power battery 200, the first inductor L1 and the second inductor L2 step down, and the power battery 200 steps up.

Fig. 5 is a schematic circuit diagram of a battery self-heating device according to still another exemplary embodiment of the present disclosure. As shown in fig. 5, the first energy storage element 31 includes a third inductor L3, the switching tube 32 includes a seventh switching tube K7, an eighth switching tube K8, a ninth switching tube K9, and a tenth switching tube K10, and the second energy storage element 33 includes a capacitor C; the first end of the seventh switching tube K7, the first end of the ninth switching tube K9, and the first end of the second energy storage element 33 are connected, the second end of the eighth switching tube K8, the second end of the tenth switching tube K10, the second end of the second energy storage element 33, and the second end of the second control switch 2 are connected to the ground, the second end of the seventh switching tube K7, the first end of the eighth switching tube K8, and the second end of the third inductor L3 are connected, the first end of the third inductor L3 is connected to the second end of the first control switch 1, and the second end of the ninth switching tube K9 is connected to the first end of the tenth switching tube K10; the controller is configured to: the first control switch 1 and the second control switch 2 are controlled to be closed, the ninth switching tube K9 and the tenth switching tube K10 are controlled to be kept open, and the third inductance L3 and/or the second energy storage element 33 and the power battery 200 are charged or discharged by controlling the alternate on-off of the seventh switching tube K7 and the eighth switching tube K8, so that the self-heating of the power battery 200 is realized.

In this embodiment, the third inductor L3, the capacitor C, the seventh switching tube K7, the eighth switching tube K8, the ninth switching tube K9, and the tenth switching tube K10 and the connection relationship therebetween may be the original components and the connection relationship in the bridgeless PFC circuit 3 of the charger. The bridgeless PFC circuit 3 is an example of a circuit of one-phase input. The controller connects the power battery 200 with the bridgeless PFC circuit 3 by controlling the first control switch 1 and the second control switch 2 to be closed and controls the ninth switching tube K9 and the tenth switching tube K10 to be kept open in the preset battery self-heating state, so as to form the battery self-heating device 100 implemented by the bridgeless PFC circuit 3.

Time sequence 1: the controller controls the seventh switching tube K7 to be opened, the eighth switching tube K8 to be closed, the power battery 200 charges the third inductor L3, the power battery 200 reduces the voltage, and the third inductor L3 increases the voltage;

time sequence 2: the controller controls the eighth switching tube K8 to be opened, the seventh switching tube K7 is closed, the power battery 200 and the third inductor L3 charge the capacitor C at the same time, the capacitor C is boosted, the third inductor L3 is stepped down, and the power battery 200 is continuously stepped down;

Time sequence 3: the on-off state of the seventh switching tube K7 and the eighth switching tube K8 is kept unchanged from the time sequence 2, at the moment, the voltage in the capacitor C rises to the highest, the current loop is reversed, the capacitor C charges the third inductor L3 and the power battery 200, the power battery 200 is boosted, the third inductor L3 is boosted, and the capacitor C is reduced;

time sequence 4: the controller controls the seventh switching tube K7 to be opened, the eighth switching tube K8 to be closed, the third inductor L3 charges the power battery 200, the third inductor L3 decreases the voltage, and the power battery 200 increases the voltage.

Fig. 6 is a schematic circuit diagram of a battery self-heating device according to still another exemplary embodiment of the present disclosure. As shown in fig. 6, on the basis of the circuit schematic diagram shown in fig. 5, the first energy storage element 31 further includes a fourth inductor L4, and the switching tube further includes an eleventh switching tube K11 and a twelfth switching tube K12; the first end of the eleventh switching tube K11, the first end of the seventh switching tube K7, the first end of the ninth switching tube K9, and the first end of the second energy storage element 33 are connected, the second end of the twelfth switching tube K12, the second end of the eighth switching tube K8, the second end of the tenth switching tube K10, the second end of the second energy storage element 33, and the second end of the second control switch 2 are connected to the ground, the second end of the eleventh switching tube K11, the first end of the twelfth switching tube K12, and the second end of the fourth inductor L4 are connected, and the first end of the fourth inductor L4, the first end of the third inductor L3, and the second end of the first control switch 1 are connected to each other; the controller is configured to: the first control switch 1 and the second control switch 2 are controlled to be closed, the ninth switching tube K9 and the tenth switching tube K10 are controlled to be kept open, and the third inductance L3 and/or the second energy storage element 33 and the power battery 200 are charged or discharged by controlling the alternate on-off of the seventh switching tube K7 and the eighth switching tube K8, and the fourth inductance L4 and/or the second energy storage element 33 and the power battery 200 are charged or discharged by controlling the alternate on-off of the eleventh switching tube K11 and the twelfth switching tube K12, so that the self-heating of the power battery 200 is realized.

The circuit schematic diagram in this embodiment adds an energy storage element and two switching tubes on the basis of the circuit schematic diagram shown in fig. 5, and can also respectively form two parallel battery self-heating loops through two inductors and/or capacitors C. In this embodiment, the third inductor L3, the fourth inductor L4, the capacitor C, the seventh switching tube K7, the eighth switching tube K8, the ninth switching tube K9, the tenth switching tube K10, the eleventh switching tube K11, the twelfth switching tube K12, and the connection relationships therebetween may be the original components and connection relationships in the bridgeless PFC circuit 3 of the charger. The bridgeless PFC circuit 3 is also an example of a circuit with one-phase input. The controller connects the power battery 200 with the bridgeless PFC circuit 3 by controlling the first control switch 1 and the second control switch 2 to be closed and controls the ninth switching tube K9 and the tenth switching tube K10 to be kept open in the preset battery self-heating state, so as to form the battery self-heating device 100 implemented by the bridgeless PFC circuit 3.

Time sequence 1: the controller controls the seventh switching tube K7 and the eleventh switching tube K11 to be opened, the eighth switching tube K8 and the twelfth switching tube K12 to be closed, the power battery 200 charges the third inductor L3 and the fourth inductor L4, the power battery 200 reduces the voltage, and the third inductor L3 and the fourth inductor L4 increase the voltage;

Time sequence 2: the controller controls the eighth switching tube K8 and the twelfth switching tube K12 to be opened, the seventh switching tube K7 and the eleventh switching tube K11 to be closed, the power battery 200, the third inductor L3 and the fourth inductor L4 charge the capacitor C at the same time, the capacitor C is boosted, the third inductor L3 and the fourth inductor L4 are stepped down, and the power battery 200 is continuously stepped down;

time sequence 3: the on-off state of the seventh switching tube K7, the eighth switching tube K8, the eleventh switching tube K11 and the twelfth switching tube K12 is kept unchanged from the time sequence 2, at the moment, the voltage in the capacitor C rises to the highest, the current loop is reversed, the capacitor C charges the third inductor L3, the fourth inductor L4 and the power battery 200, the power battery 200 is boosted, the third inductor L3 and the fourth inductor L4 are boosted, and the capacitor C is reduced;

time sequence 4: the controller controls the seventh switching tube K7 and the eleventh switching tube K11 to be opened, the eighth switching tube K8 and the twelfth switching tube K12 to be closed, the third inductor L3 and the fourth inductor L4 charge the power battery 200, the third inductor L3 and the fourth inductor L4 step down, and the power battery 200 steps up.

Fig. 7 is a schematic circuit diagram of a battery self-heating device according to still another exemplary embodiment of the present disclosure. As shown in fig. 7, the apparatus 100 further includes a third control switch 6 and a fourth control switch 7, the first energy storage element 31 includes a fifth inductor L5, a sixth inductor L6 and a seventh inductor L7, the switching tubes include a thirteenth switching tube K13, a fourteenth switching tube K14, a fifteenth switching tube K15, a sixteenth switching tube K16, a seventeenth switching tube K17, an eighteenth switching tube K18, and the second energy storage element 33 includes a capacitor C; the second end of the first control switch 1, the first end of the third control switch 6, the first end of the fourth control switch 7 and the first end of the fifth inductor L5 are connected, the second end of the third control switch 6 is connected with the first end of the sixth inductor L6, the second end of the fourth control switch 7 is connected with the first end of the seventh inductor L7, the second end of the fifth inductor L5, the second end of the thirteenth switching tube K13, the first end of the fourteenth switching tube K14 are connected, the second end of the sixth inductor L6, the second end of the fifteenth switching tube K15 and the first end of the sixteenth switching tube K16 are connected, the second end of the seventh inductor L7, the second end of the seventeenth switching tube K17 and the first end of the seventeenth switching tube K18 are connected, the first end of the thirteenth switching tube K13, the second end of the fifteenth switching tube K15, the second end of the sixteenth switching tube K33 and the second end of the sixteenth switching tube K element K33 are connected with the second end of the sixteenth switching tube K element K33; the controller is further configured to, in the preset battery self-heating state, be configured to: controlling the first control switch 1, the second control switch 2, the third control switch 6 and the fourth control switch 7 to be closed, and controlling the thirteenth switching tube K13 and the fourteenth switching tube K14 to be alternately switched on and off so as to charge or discharge the fifth inductor L5 and/or the second energy storage element 33 and the power battery 200; and/or, the fifteenth switching tube K15 and the sixteenth switching tube K16 are controlled to be alternately turned on and off, so that the sixth inductance L6 and/or the second energy storage element 33 are/is charged or discharged with the power battery 200; and/or, controlling the alternate on-off of the seventeenth switch tube K17 and the eighteenth switch tube K18 to charge or discharge the seventh inductor L7 and/or the second energy storage element 33 and the power battery 200, so as to realize self-heating of the power battery 200.

In this embodiment, the fifth inductor L5, the sixth inductor L6, the seventh inductor L7, the capacitor C, the thirteenth switching tube K13, the fourteenth switching tube K14, the fifteenth switching tube K15, the sixteenth switching tube K16, the seventeenth switching tube K17, the eighteenth switching tube K18 and the connection relationship therebetween may be the original components and the connection relationship in the bridgeless PFC circuit 3 of the charger. The bridgeless PFC circuit 3 is an example of a three-phase input circuit, and can make the current phases of the input inductor L5, the inductor L6 and the inductor L7 respectively differ by 1/3 period by controlling the on/off of the first control switch 1, the third control switch 6 and the fourth control switch 7, and the circuits formed by the three inductors and/or the capacitor C can be used as battery self-heating circuits at the same time, or one or two circuits can be selected as the battery self-heating circuits according to requirements. The controller connects the power battery 200 and the bridgeless PFC circuit 3 by controlling the first control switch 1 and the second control switch 2 to be closed in the preset battery self-heating state, and selectively controls the third control switch 6 and the fourth control switch 7 to be closed according to the requirement, so that the current loops of the sixth inductor L6 and the seventh inductor L7 are connected to the battery self-heating loop, or any one of the control switches is closed, only the current loops of the two bridgeless PFC circuits 3 are connected, or neither of the control switches is closed, only the current loop of the fifth inductor L5 is used as the battery self-heating loop, and the like, thereby forming the battery self-heating device 100 realized by the bridgeless PFC circuit 3.

In the case where both the third control switch 6 and the fourth control switch 7 are closed, the control process of self-heating of the battery in the present embodiment includes the following four-cycle timings.

Time sequence 1: the controller controls the thirteenth switching tube K13, the fifteenth switching tube K15 and the seventeenth switching tube K17 to be opened, the fourteenth switching tube K14, the sixteenth switching tube K16 and the eighteenth switching tube K18 to be closed, the power battery 200 charges the fifth inductor L5, the sixth inductor L6 and the seventh inductor L7, the power battery 200 steps down, and the fifth inductor L5, the sixth inductor L6 and the seventh inductor L7 step up;

time sequence 2: the controller controls the fourteenth switching tube K14, the sixteenth switching tube K16 and the eighteenth switching tube K18 to be opened, the thirteenth switching tube K13, the fifteenth switching tube K15 and the seventeenth switching tube K17 to be closed, the power battery 200 charges the capacitor C simultaneously with the fifth inductor L5, the sixth inductor L6 and the seventh inductor L7, the capacitor C is boosted, the fifth inductor L5, the sixth inductor L6 and the seventh inductor L7 are reduced in voltage, and the power battery 200 is continuously reduced in voltage;

time sequence 3: the on-off state of the thirteenth switching tube K13, the fourteenth switching tube K14, the fifteenth switching tube K15, the sixteenth switching tube K16, the seventeenth switching tube K17 and the eighteenth switching tube K18 is kept unchanged from the time sequence 2, at the moment, the voltage in the capacitor C rises to the highest, the current loop is reversed, the capacitor C charges the fifth inductor L5, the sixth inductor L6, the seventh inductor L7 and the power battery 200, the power battery 200 boosts, the fifth inductor L5, the sixth inductor L6 and the seventh inductor L7 boost, and the capacitor C reduces the voltage;

Time sequence 4: the controller controls the thirteenth switching tube K13, the fifteenth switching tube K15 and the seventeenth switching tube K17 to be opened, the fourteenth switching tube K14, the sixteenth switching tube K16 and the eighteenth switching tube K18 to be closed, the fifth inductor L5, the sixth inductor L6 and the seventh inductor L7 charge the power battery 200, the fifth inductor L5, the sixth inductor L6 and the seventh inductor L7 are reduced in voltage, and the power battery 200 is boosted.

Fig. 8 is a flowchart illustrating a method of self-heating a battery according to an exemplary embodiment of the present disclosure. As shown in fig. 8, the method includes steps 101 and 102.

In step 101, an instruction to enter a preset battery self-heating state is acquired.

In step 102, in a preset battery self-heating state, the first control switch 1 and the second control switch 2 are controlled to be closed, and the switching tube in the bridgeless PFC circuit 3 is controlled to be opened, so that the first energy storage element 31 and/or the second energy storage element 33 in the bridgeless PFC circuit 3 and the power battery 200 are charged or discharged, and self-heating of the power battery 200 is realized; the first end of the first control switch 1 is connected with the positive electrode of the power battery 200, the first end of the second control switch 2 is connected with the negative electrode of the power battery 200, the second end of the first control switch 1 and the second end of the second control switch 2 are respectively connected with two ends of the bridgeless PFC circuit 3, wherein the bridgeless PFC circuit 3 comprises a first energy storage element 31, a second energy storage element 33 and a switching tube connected with the first energy storage element 31 and/or the second energy storage element 33.

In one possible embodiment, the method further comprises: in the self-heating state of the preset battery, the first control switch 1 and the second control switch 2 are controlled to be closed, the third switch tube K3 is controlled to be opened, the fourth switch tube K4 is controlled to be closed, and the first inductance L1 and/or the second energy storage element 33 and the power battery 200 are charged or discharged by controlling the alternate on-off of the first switch tube K1 and the second switch tube K2, so that the self-heating of the power battery 200 is realized. The first end of the first switch tube K1, the first end of the third switch tube K3 and the first end of the second energy storage element 33 are connected, the second end of the second switch tube K2, the second end of the fourth switch tube K4 and the second end of the second energy storage element 33 are connected to the ground, the second end of the first switch tube K1, the first end of the second switch tube K2 and the second end of the first inductor L1 are connected, the first end of the second inductor L2 is connected with the second end of the first control switch 1, and the second end of the third switch tube K3, the first end of the fourth switch tube K4 and the second end of the second control switch 2 are connected.

In one possible embodiment, the method further comprises: in the self-heating state of the preset battery, the first control switch 1 and the second control switch 2 are controlled to be closed, the third switch tube K3 is controlled to be opened, the fourth switch tube K4 is controlled to be closed, the first inductance L1 and/or the second energy storage element 33 and the power battery 200 are charged or discharged by controlling the alternate on-off of the first switch tube K1 and the second switch tube K2, and the second inductance L2 and/or the second energy storage element 33 and the power battery 200 are charged or discharged by controlling the alternate on-off of the fifth switch tube K5 and the sixth switch tube K6, wherein the on-off states of the first switch tube K1 and the fifth switch tube K5 are consistent, and the on-off states of the second switch tube K2 and the sixth switch tube K6 are consistent. The first end of the fifth switching tube K5, the first end of the first switching tube K1, the first end of the third switching tube K3, and the first end of the second energy storage element 33 are connected, the second end of the sixth switching tube K6, the second end of the second switching tube K2, the second end of the fourth switching tube K4, and the second end of the second energy storage element 33 are connected to the ground, the second end of the fifth switching tube K5, the first end of the sixth switching tube K6, and the second end of the second inductor L2 are connected, and the first end of the second inductor L2, the first end of the first inductor L1, and the second end of the first control switch 1 are connected.

In one possible embodiment, the method further comprises: in the self-heating state of the preset battery, the first control switch 1 and the second control switch 2 are controlled to be closed, the ninth switch tube K9 and the tenth switch tube K10 are controlled to be kept open, and the third inductance L3 and/or the second energy storage element 33 and the power battery 200 are charged or discharged by controlling the alternate on-off of the seventh switch tube K7 and the eighth switch tube K8, so that the self-heating of the power battery 200 is realized. The first end of the seventh switching tube K7, the first end of the ninth switching tube K9, the first end of the second energy storage element 33 are connected, the second end of the eighth switching tube K8, the second end of the tenth switching tube K10, the second end of the second energy storage element 33 and the second end of the second control switch 2 are connected to the ground, the second end of the seventh switching tube K7, the first end of the eighth switching tube K8 and the second end of the third inductor L3 are connected, the first end of the third inductor L3 is connected to the second end of the first control switch 1, and the second end of the ninth switching tube K9 and the first end of the tenth switching tube K10 are connected to the ground.

In one possible embodiment, the method further comprises: in the self-heating state of the preset battery, the first control switch 1 and the second control switch 2 are controlled to be closed, the ninth switch tube K9 and the tenth switch tube K10 are controlled to be opened, the third inductance L3 and/or the second energy storage element 33 and the power battery 200 are charged or discharged by controlling the alternate on-off of the seventh switch tube K7 and the eighth switch tube K8, and the fourth inductance L4 and/or the second energy storage element 33 and the power battery 200 are charged or discharged by controlling the alternate on-off of the eleventh switch tube K11 and the twelfth switch tube K12, wherein the on-off state of the seventh switch tube K7 and the eleventh switch tube K11 is kept consistent, and the on-off state of the eighth switch tube K8 and the twelfth switch tube K12 is kept consistent. The first end of the eleventh switching tube K11, the first end of the seventh switching tube K7, the first end of the ninth switching tube K9, and the first end of the second energy storage element 33 are connected, the second end of the twelfth switching tube K12, the second end of the eighth switching tube K8, the second end of the tenth switching tube K10, the second end of the second energy storage element 33, and the second end of the second control switch 2 are connected to the ground, the second end of the eleventh switching tube K11, the first end of the twelfth switching tube K12, and the second end of the fourth inductor L4 are connected, and the first end of the fourth inductor L4, the first end of the third inductor L3, and the second end of the first control switch 1 are connected to each other.

In one possible embodiment, the method further comprises: in the self-heating state of the preset battery, a first control switch 1, a second control switch 2, a third control switch 6 and a fourth control switch 7 are controlled to be closed, and the thirteenth switching tube K13 and the fourteenth switching tube K14 are controlled to be alternately switched on and off so as to charge or discharge the fifth inductor L5 and/or the second energy storage element 33 and the power battery 200; and/or, the fifteenth switching tube K15 and the sixteenth switching tube K16 are controlled to be alternately turned on and off, so that the sixth inductance L6 and/or the second energy storage element 33 are/is charged or discharged with the power battery 200; and/or, controlling the alternate on-off of the seventeenth switching tube K17 and the eighteenth switching tube K18 to charge or discharge the seventh inductor L7 and/or the second energy storage element 33 and the power battery 200. The second end of the first control switch 1, the first end of the third control switch 6, the first end of the fourth control switch 7 and the first end of the fifth inductor L5 are connected, the second end of the third control switch 6 is connected with the first end of the sixth inductor L6, the second end of the fourth control switch 7 is connected with the first end of the seventh inductor L7, the second end of the fifth inductor L5, the second end of the thirteenth switching tube K13 and the first end of the fourteenth switching tube K14 are connected, the second end of the sixth inductor L6, the second end of the fifteenth switching tube K15 and the first end of the sixteenth switching tube K16 are connected, the second end of the seventh inductor L7, the second end of the seventeenth switching tube K17 and the first end of the seventeenth switching tube K18 are connected, the first end of the thirteenth switching tube K13, the second end of the fifteenth switching tube K15, the second end of the sixteenth switching tube K33 and the second end of the sixteenth switching tube K element K33 are connected with the second end of the sixteenth switching tube K element K, the second end of the sixteenth switching tube K element K33 and the second end of the sixteenth switching tube K element K.

In one possible embodiment, the second energy storage element 33 comprises a capacitor C.

In one possible embodiment, the bridgeless PFC circuit 3 comprises a single-phase input bridgeless PFC circuit 3 or a multiphase input bridgeless PFC circuit 3.

In one possible embodiment, the power battery 200 is a power battery 200 for supplying power to a driving motor of an electric vehicle, and the bridgeless PFC circuit 3 is a bridgeless PFC circuit in a charger of the electric vehicle.

In one possible embodiment, the method further comprises: if the temperature of the power battery 200 is not greater than the preset temperature threshold and a charger is not started, determining that the electric vehicle is in the self-heating state of the preset battery; or if the current moment reaches the preset battery self-heating time and the charger in the electric vehicle is not started, judging that the electric vehicle is in the preset battery self-heating state; when the electric vehicle is judged to be in the self-heating state of the preset battery, the electric vehicle is in any one of a power-on state, a driving state or a power-off state.

The present disclosure also provides an electric vehicle including the battery self-heating device 100 described above.

The specific manner in which the operations are performed by the steps in the above embodiments has been described in detail in relation to the embodiments of the apparatus, and will not be described in detail herein.

The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solutions of the present disclosure within the scope of the technical concept of the present disclosure, and all the simple modifications belong to the protection scope of the present disclosure.

In addition, the specific features described in the above embodiments may be combined in any suitable manner without contradiction. The various possible combinations are not described further in this disclosure in order to avoid unnecessary repetition.

Moreover, any combination between the various embodiments of the present disclosure is possible as long as it does not depart from the spirit of the present disclosure, which should also be construed as the disclosure of the present disclosure.

Claims

1. A battery self-heating device is characterized by comprising a first control switch, a second control switch, a bridgeless PFC circuit and a controller, wherein,

the first end of the first control switch is connected with the positive electrode of the power battery, the first end of the second control switch is connected with the negative electrode of the power battery, the second end of the first control switch and the second end of the second control switch are respectively connected with two ends of the bridgeless PFC circuit, and the bridgeless PFC circuit comprises a first energy storage element, a second energy storage element and a switching tube connected with the first energy storage element and/or the second energy storage element;

the controller is configured to: and controlling the first control switch and the second control switch to be closed, and controlling the switching tube in the bridgeless PFC circuit to be opened or closed so as to charge or discharge the first energy storage element and/or the second energy storage element in the bridgeless PFC circuit and the power battery, thereby realizing self-heating of the power battery.

2. The apparatus of claim 1, wherein the first energy storage element comprises a first inductor, and the switching tube comprises a first switching tube, a second switching tube, a third switching tube, and a fourth switching tube;

The first end of the first switch tube, the first end of the third switch tube and the first end of the second energy storage element are connected, the second end of the second switch tube, the second end of the fourth switch tube and the second end of the second energy storage element are connected to the ground, the second end of the first switch tube, the first end of the second switch tube and the second end of the first inductor are connected, the first end of the second inductor is connected with the second end of the first control switch, and the second end of the third switch tube, the first end of the fourth switch tube and the second end of the second control switch are connected;

the controller is configured to: and controlling the first control switch and the second control switch to be closed, controlling the third switching tube to be opened, and controlling the fourth switching tube to be closed, and controlling the alternate on-off of the first switching tube and the second switching tube so as to charge or discharge the first inductor and/or the second energy storage element and the power battery, thereby realizing self-heating of the power battery.

3. The apparatus of claim 2, wherein the first energy storage element further comprises a second inductor, the switching tube further comprising a fifth switching tube and a sixth switching tube;

The first end of the fifth switching tube, the first end of the first switching tube, the first end of the third switching tube and the first end of the second energy storage element are connected, the second end of the sixth switching tube, the second end of the second switching tube, the second end of the fourth switching tube and the second end of the second energy storage element are connected and grounded, the second end of the fifth switching tube, the first end of the sixth switching tube and the second end of the second inductor are connected, and the first end of the second inductor, the first end of the first inductor and the second end of the first control switch are connected;

the controller is configured to: and controlling the first control switch and the second control switch to be closed, controlling the third switching tube to be opened, controlling the fourth switching tube to be closed, controlling the first switching tube and the second switching tube to be alternately switched on and off so as to charge or discharge the first inductor and/or the second energy storage element and the power battery, and controlling the fifth switching tube and the sixth switching tube to be alternately switched on and off so as to charge or discharge the second inductor and/or the second energy storage element and the power battery, wherein the switching-on states of the first switching tube and the fifth switching tube are kept consistent, and the switching-off states of the second switching tube and the sixth switching tube are kept consistent.

4. The apparatus of claim 1, wherein the first energy storage element comprises a third inductance, the switching tube comprising a seventh switching tube, an eighth switching tube, a ninth switching tube, and a tenth switching tube;

the first end of the seventh switching tube, the first end of the ninth switching tube and the first end of the second energy storage element are connected, the second end of the eighth switching tube, the second end of the tenth switching tube, the second end of the second energy storage element and the second end of the second control switch are connected and grounded, the second end of the seventh switching tube, the first end of the eighth switching tube and the second end of the third inductor are connected, the first end of the third inductor is connected with the second end of the first control switch, and the second end of the ninth switching tube and the first end of the tenth switching tube are connected;

the controller is configured to: and controlling the first control switch and the second control switch to be closed, controlling the ninth switching tube and the tenth switching tube to be kept open, and controlling the alternate on-off of the seventh switching tube and the eighth switching tube so as to charge or discharge the third inductor and/or the second energy storage element and the power battery, thereby realizing self-heating of the power battery.

5. The apparatus of claim 4, wherein the first energy storage element further comprises a fourth inductor, and wherein the switching tube further comprises an eleventh switching tube and a twelfth switching tube;

the first end of the eleventh switching tube, the first end of the seventh switching tube, the first end of the ninth switching tube and the first end of the second energy storage element are connected, the second end of the twelfth switching tube, the second end of the eighth switching tube, the second end of the second energy storage element and the second end of the second control switch are connected and grounded, the second end of the eleventh switching tube, the first end of the twelfth switching tube and the second end of the fourth inductor are connected, and the first end of the fourth inductor, the first end of the third inductor and the second end of the first control switch are connected;

the controller is configured to: and controlling the first control switch and the second control switch to be closed, controlling the ninth switch tube and the tenth switch tube to be kept open, controlling the alternate on-off of the seventh switch tube and the eighth switch tube so as to charge or discharge the third inductor and/or the second energy storage element with the power battery respectively, and controlling the alternate on-off of the eleventh switch tube and the twelfth switch tube so as to charge or discharge the fourth inductor and/or the second energy storage element with the power battery, wherein the on-off states of the seventh switch tube and the eleventh switch tube are kept consistent, and the on-off states of the eighth switch tube and the twelfth switch tube are kept consistent.

6. The apparatus of claim 1, further comprising a third control switch and a fourth control switch, wherein the first energy storage element comprises a fifth inductor, a sixth inductor, and a seventh inductor, and wherein the switching tubes comprise a thirteenth switching tube, a fourteenth switching tube, a fifteenth switching tube, a sixteenth switching tube, a seventeenth switching tube, and an eighteenth switching tube;

the second end of the first control switch, the first end of the third control switch, the first end of the fourth control switch and the first end of the fifth inductor are connected, the second end of the third control switch is connected with the first end of the sixth inductor, the second end of the fourth control switch is connected with the first end of the seventh inductor, the second end of the fifth inductor, the second end of the thirteenth switching tube and the first end of the fourteenth switching tube are connected, the second end of the sixth inductor, the second end of the fifteenth switching tube and the first end of the sixteenth switching tube are connected, the second end of the seventh inductor, the second end of the seventeenth switching tube and the first end of the eighteenth switching tube are connected, the first end of the thirteenth switching tube, the first end of the seventeenth switching tube and the first end of the second energy storage element are connected, and the second end of the sixteenth switching tube, the second end of the second switching tube and the second end of the eighteenth switching tube are connected in parallel;

The controller is configured to: controlling the first control switch, the second control switch, the third control switch and the fourth control switch to be closed, and,

controlling the thirteenth switching tube and the fourteenth switching tube to be alternately switched on and off so as to charge or discharge the fifth inductor and/or the second energy storage element with the power battery; and/or the number of the groups of groups,

controlling the fifteenth switch tube and the sixteenth switch Guan Jiaoti to be switched on and off so as to charge or discharge the sixth inductor and/or the second energy storage element and the power battery; and/or the number of the groups of groups,

and controlling the alternate on-off of the seventeenth switching tube and the eighteenth switching tube so as to charge or discharge the seventh inductor and/or the second energy storage element and the power battery.

7. The apparatus of any one of claims 1-6, wherein the second energy storage element comprises a capacitor.

8. The apparatus of any of claims 1-6, wherein the bridgeless PFC circuit comprises a single phase input bridgeless PFC circuit or a multiphase input bridgeless PFC circuit.

9. The apparatus of claim 1, wherein the power battery is a power battery that provides power to a drive motor of an electric vehicle, and wherein the bridgeless PFC circuit is a bridgeless PFC circuit in a charger of the electric vehicle.

10. The apparatus of claim 9, wherein the controller is further configured to:

if the temperature of the power battery is not greater than the preset temperature threshold and the charger is not started, judging that the electric vehicle is in the self-heating state of the preset battery; or alternatively

If the current moment reaches the preset battery self-heating time and the charger in the electric vehicle is not started, judging that the electric vehicle is in the preset battery self-heating state;

when the electric vehicle is judged to be in the self-heating state of the preset battery, the electric vehicle is in any one of a power-on state, a driving state or a power-off state.

11. A method of self-heating a battery, the method comprising:

acquiring an instruction for entering a self-heating state of a preset battery;

under the self-heating state of a preset battery, the first control switch and the second control switch are controlled to be closed, and the first energy storage element and/or the second energy storage element in the bridgeless PFC circuit are/is charged or discharged with the power battery by controlling the switching tube in the bridgeless PFC circuit to be opened and closed, so that the self-heating of the power battery is realized;

The first end of the first control switch is connected with the positive electrode of the power battery, the first end of the second control switch is connected with the negative electrode of the power battery, the second end of the first control switch and the second end of the second control switch are respectively connected with two ends of the bridgeless PFC circuit, and the bridgeless PFC circuit comprises a first energy storage element, a second energy storage element and a switching tube connected with the first energy storage element and/or the second energy storage element.

12. An electric vehicle characterized in that it comprises a battery self-heating device according to any one of claims 1-10.