Charging heating circuit, method and system and vehicle

Abstract

The invention relates to a charging heating circuit, method and system and a vehicle, relates to the technical field of batteries, and at least solves the technical problem of limitation of a battery heating scene in related technologies. The method comprises the following steps: acquiring current state information of a battery; based on the current state information, a preset charging condition and a preset heating condition, state demand information is obtained, the preset charging condition is used for indicating whether the battery needs to be charged currently, the preset heating condition is used for indicating whether the battery needs to be heated currently, and the state demand information is used for indicating whether the battery needs to be charged and whether the battery needs to be heated; under the condition that the state demand information indicates that the battery needs to be heated while being charged, a first control instruction is sent out, and the first control instruction is used for controlling a first switch unit and a second switch unit in the charging and heating circuit to be switched on; therefore, the battery can be heated while being charged.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to a charging and heating circuit, method, system and vehicle. Background Art

[0002] With the rapid growth of the new energy vehicle market scale, users' requirements for the environmental adaptability of electric vehicles are also getting higher and higher. However, the low-temperature performance of the battery is limited in low-temperature environments, which will affect the user experience.

[0003] One prior art provides a battery heating method, which detects the current temperature of the battery and cyclically controls the pulse frequency and discharge duty ratio to generate a pulse width modulation signal for heating the battery. Another prior art provides a battery heating method, which sets the pulse heating entry condition, and when the pulse heating entry condition is met, the motor system enters the pulse heating mode to perform pulse heating on the battery.

[0004] The above methods can achieve rapid heating of the battery in low-temperature environments through pulse heating, improving the performance of the battery. However, there are limitations in the scenarios for battery heating. Therefore, a new method for heating the battery is needed. Summary of the Invention

[0005] One object of this application is to provide a charging and heating circuit, method, system and vehicle to at least solve the technical problem that there are limitations in the scenarios for battery heating in related technologies.

[0006] In a first aspect, the present invention provides a charging and heating circuit. The charging and heating circuit includes: a battery; a power module, the first end of the power module is connected to the first pole of the battery, and the second end of the power module is connected to the second pole of the battery; a motor, connected to the third end of the power module; a charging port, connected between the first pole and the second pole of the battery, and the charging port is used to connect to a charging device; a first switch unit, connected between the battery and the power module; a second switch unit and an isolation unit, connected in series between the battery and the charging port. In the case where it is necessary to charge and heat the battery simultaneously, the second switch unit is configured to be turned on so that the battery and the charging device form a charging circuit. And, the first switch unit is configured to be turned on so that the battery, the power module and the motor form a heating circuit. The isolation unit allows current to flow from the charging port to the battery and blocks current from flowing from the battery to the charging port.

[0007] In a possible way, the isolation unit includes a diode, the positive pole of the diode is connected to the charging port, and the negative pole of the diode is connected to the battery. The isolation unit is connected between the charging port and the second switch unit. Or, the isolation unit is connected between the battery and the second switch unit.

[0008] In a possible way, when it is necessary to only charge the battery without heating it, the second switch unit is configured to be turned on so that the battery and the charging device form a charging circuit. The first switch unit is configured to be turned off. When it is necessary to only heat the battery without charging it, the first switch unit is configured to be turned on so that the battery, the power module, and the motor form a heating circuit. The second switch unit is configured to be turned off.

[0009] In a possible way, the charging and heating circuit further includes a third switch unit, which is connected in parallel with the isolation unit. The third switch unit is configured to be turned on when only charging the battery without heating it.

[0010] In a possible way, the first switch unit is connected between the first pole of the battery and the first end of the power module. The second switch unit and the isolation unit are connected between the first pole of the battery and the charging port.

[0011] In a possible way, the power module includes three-phase bridge arms connected in parallel, and the motor includes three-phase coils. The first ends of the three-phase bridge arms are all connected to the first pole of the battery, the second ends of the three-phase bridge arms are connected to the second pole of the battery, the midpoints of the three-phase bridge arms are respectively connected to the first ends of the three-phase coils, and the midpoint of the bridge arm is the connection point of the upper bridge arm and the lower bridge arm of the bridge arm. The three-phase bridge arms include a first bridge arm, a second bridge arm, and a third bridge arm, and the three-phase coils include a first coil, a second coil, and a third coil. When it is necessary to charge and heat the battery at the same time, in the first stage, the upper bridge arms of the first bridge arm and / or the second bridge arm, and the lower bridge arm of the third bridge arm are forward-conducted, and the current from the charging port charges the first coil and / or the second coil, and the third coil. Forward conduction is from the first end of the bridge arm to the midpoint of the bridge arm. In the second stage, the lower bridge arms of the first bridge arm and / or the second bridge arm, and the upper bridge arm of the third bridge arm are reverse-conducted, and the first coil and / or the second coil, and the third coil discharge to the battery. Reverse conduction is from the second end of the bridge arm to the midpoint of the bridge arm.

[0012] In a possible way, the third switch unit is configured to be turned on in the first stage and turned off in the second stage.

[0013] In a second aspect, the present application provides a charging and heating method, which is applied to the charging and heating circuit as described in the first aspect. The method includes: obtaining the current state information of the battery. Based on the current state information, the preset charging condition, and the preset heating condition, obtaining the state demand information, where the preset charging condition is used to indicate whether the battery needs to be charged currently, the preset heating condition is used to indicate whether the battery needs to be heated currently, and the state demand information is used to indicate whether the battery needs to be charged and whether it needs to be heated. When the state demand information indicates that the battery needs to be charged and heated at the same time, a first control instruction is issued, and the first control instruction is used to control both the first switch unit and the second switch unit in the charging and heating circuit to be turned on.

[0014] In a possible way, when the state demand information indicates that the battery needs to be only charged without heating, a second control instruction is issued, and the second control instruction is used to control the first switch unit to disconnect and the second switch unit to conduct. When the state demand information indicates that the battery needs to be only heated without charging, a third control instruction is issued, and the third control instruction is used to control the first switch unit to conduct and the second switch unit to disconnect.

[0015] In a possible way, the first control instruction further includes a first charging demand power when indicating that the battery is charging, and a first heating demand temperature when indicating that the battery is heating. The second control instruction further includes a second charging demand power when indicating that the battery is charging. The third control instruction further includes a second heating demand temperature when indicating that the battery is heating.

[0016] In a third aspect, the present application provides a charging and heating system, including: the charging and heating circuit and the battery management module as in the first aspect; wherein, the battery management module is connected to the first switch unit and the second switch unit of the charging and heating circuit, and is used to control the first switch unit and the second switch unit to conduct or disconnect based on the current demand of the battery. The current demand of the battery includes: charging while heating, only charging without heating, and only heating without charging.

[0017] In a possible way, the charging and heating circuit further includes a motor control unit, which is connected to the three-phase bridge arm of the power module and is used to control the switching states of the upper bridge arm and the lower bridge arm of the three-phase bridge arm.

[0018] In a fourth aspect, the present application provides a vehicle, which includes the charging and heating system as in the third aspect, and the vehicle is used to implement the method as in the second aspect and any one of its possible implementation manners.

[0019] In a fifth aspect, the present application provides a charging and heating device, including: a processor; a memory for storing processor-executable instructions; wherein, the processor is configured to execute the instructions to implement the method as in the second aspect and any one of its possible implementation manners.

[0020] In a sixth aspect, the present application provides a computer-readable storage medium, when the instructions in the computer-readable storage medium are executed by the processor of the charging and heating device, the charging and heating device can execute the method as in the second aspect and any one of its possible implementation manners.

[0021] In a seventh aspect, the present application provides a computer program product, the computer program product includes computer instructions, when the computer instructions run on the charging and heating device, the charging and heating device is enabled to implement the method as in the second aspect and any one of its possible implementation manners.

[0022] Thus, the above technical features of the present application have the following beneficial effects: After the second switch unit K2 is turned on, the charging device can directly charge the battery through the charging port. After the first switch unit K1 is turned on, the power module realizes battery heating. The isolation unit D can make the charging current flow into the battery unidirectionally, blocking the battery from discharging reversely to the charging device and avoiding equipment damage caused by energy backflow, thus improving system reliability. In this way, the user does not need to wait for the battery to warm up, and charging and heating can be carried out simultaneously, shortening the waiting time.

[0023] (2)When the battery is charged by a charging device connected in series with the charging port, the isolation unit D can prevent the current in the heating circuit from flowing into the charging device through the closed second switch unit K2. Since the diode has unidirectional conductivity, allowing current to flow in one direction and hardly conducting in the other direction, it can prevent the current in the heating circuit from flowing into the charging device and damaging the charging device.

[0024] (3)When only charging the battery without heating is required, the current can charge the battery through the turned-on second switch unit K2. When only heating the battery without charging is required, the current can heat the battery through the turned-on first switch unit K1.

[0025] (4)When only charging the battery without heating, the third switch unit K3 is turned on, which can make the current flow through the third switch unit K3 directly to charge the battery without passing through the isolation unit D. In this way, the current power for battery charging can be greater, thus accelerating the battery charging speed.

[0026] (5)The first switch unit K1, the second switch unit K2 and the isolation unit D are integrated together, which is convenient for the battery management system to control. Further, by controlling the conduction or disconnection of the second switch unit K2, the conduction or disconnection of the battery charging circuit can be controlled, and then the charging of the battery can be controlled. The isolation unit D can block the battery from discharging reversely to the charging port when charging and heating the battery simultaneously, thus protecting the battery from damage.

[0027] (6)Through the charging and heating circuit composed of the battery, the power module, the motor, the charging port, the first switch unit K1, the second switch unit K2 and the isolation unit D, it is possible to charge and heat the battery simultaneously. When it is necessary to charge and heat the battery simultaneously, the three-phase bridge arm can be controlled in the first stage and the second stage to realize pulse heating of the battery.

[0028] (7)The third switch unit K3 is turned on in the first stage and turned off in the second stage, which can make the current have a greater power without flowing into the charging device. While accelerating the battery charging speed, it can also avoid damaging the charging device.

[0029] (8) By obtaining the current state information of the battery, the preset charging condition, and the preset heating condition, the state requirement information of the battery can be determined, thereby determining whether the battery needs charging and heating. When the state requirement information indicates that the battery needs to be charged and heated simultaneously, a first control instruction can be issued to control both the first switch unit and the second switch unit in the charging and heating circuit to conduct, thereby realizing simultaneous charging and heating of the battery. In this way, the charging and heating requirements of the battery can be satisfied simultaneously, reducing the time required for the battery to reach the working state, and thus improving the starting efficiency.

[0030] (9) Through the second control instruction and the third control instruction, the conduction or disconnection of the first switch unit and the second switch unit can be controlled, thereby realizing charging the battery without heating or heating the battery without charging. In this way, according to the state requirement information of the battery, the current charging and heating requirement situation of the battery can be determined to heat or charge the battery, ensuring that the battery is in a normal working environment, thereby prolonging the battery life.

[0031] (10) By obtaining the first charging demand power and the first heating demand temperature, the actual tolerable charging power and the target heating temperature in the current state can be accurately determined, preventing the battery from overcharging or overheating when it needs to be charged and heated simultaneously. Through the second charging demand power, the actual tolerable charging power of the battery can be accurately determined when it needs to be charged without heating, and through the second heating demand temperature, the battery can be accurately controlled to reach an appropriate temperature when it needs to be heated without charging. Prevent the battery from overcharging when it needs to be charged without heating and overheating when it needs to be heated without charging, thereby ensuring the safety of the battery.

[0032] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit this application. Brief Description of the Drawings

[0033] The drawings herein are incorporated into the specification and constitute a part of this specification, showing embodiments consistent with this application, and are used together with the specification to explain the principles of this application, and do not constitute an improper limitation of this application.

[0034] Figure 1 is an example schematic diagram of a charging and heating circuit shown according to an exemplary embodiment; Figure 2 is another example schematic diagram of a charging and heating circuit shown according to an exemplary embodiment; Figure 3 is another example schematic diagram of a charging and heating circuit shown according to an exemplary embodiment; Figure 4 is another example schematic diagram of a charging and heating circuit shown according to an exemplary embodiment; Figure 5 It is an example schematic diagram of another charging and heating circuit shown according to an exemplary embodiment; Figure 6 It is a schematic flowchart of a charging and heating method shown according to an exemplary embodiment; Figure 7 It is a schematic structural diagram of a charging and heating device shown according to an exemplary embodiment; Figure 8 It is a schematic structural diagram of another charging and heating device shown according to an exemplary embodiment.

[0035] Reference numerals: D, isolation unit; K1, first switch unit; K2, second switch unit; K3, third switch unit; C, capacitor; S1, first upper arm transistor; S2, second upper arm transistor; S3, third upper arm transistor; S4, first lower arm transistor; S5, second lower arm transistor; S6, third lower arm transistor; D1, first upper arm diode; D2, second upper arm diode; D3, third upper arm diode; D4, first lower arm diode; D5, second lower arm diode; D6, third lower arm diode; L1, first coil; L2, second coil; L3, third coil. Detailed implementation manners

[0036] In order to enable those of ordinary skill in the art to better understand the technical solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0037] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances so that the embodiments of the present application described here can be implemented in an order other than those illustrated or described here. The implementation manners described in the following exemplary embodiments do not represent all implementation manners consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0038] In an exemplary embodiment, the embodiment of the present application provides a vehicle, which includes a charging and heating system, and the vehicle can execute the method in the above-mentioned embodiment through the charging and heating system.

[0039] In some embodiments, the charging and heating system includes: a charging and heating circuit.

[0040] In the embodiment of the present application, as Figure 1 shown, the charging and heating circuit includes: a battery, a power module, a motor, a charging port, a first switch unit K1, a second switch unit K2, and an isolation unit D.

[0041] Among them, the first end of the power module is connected to the first pole of the battery, and the second end of the power module is connected to the second pole of the battery. The motor is connected to the third end of the power module. The charging port is connected between the first pole and the second pole of the battery, and the charging port is used to connect to a charging device. The first switch unit K1 is connected between the battery and the power module, and the second switch unit K2 and the isolation unit D are connected in series between the battery and the charging port.

[0042] Optionally, the first switch unit K1 is connected between the first pole of the battery and the first end of the power module, and the second switch unit K2 and the isolation unit D are connected between the first pole of the battery and the charging port.

[0043] In a possible design, as Figure 1 shown, the second switch unit (K2), the isolation unit, and the first switch unit (K1) are connected in series between the battery and the charging port.

[0044] It can be understood that the first switch unit K1, the second switch unit K2, and the isolation unit D are integrated together, which is convenient for the battery management system to control. Further, by controlling the on or off of the second switch unit K2, the charging circuit of the battery can be controlled to be on or off, thereby controlling the charging of the battery. The isolation unit D can prevent the battery from discharging reversely to the charging port when the battery is heated while charging, thus protecting the battery from damage.

[0045] Exemplarily, the first switch unit K1 and the second switch unit K2 can be relays. The first switch unit K1 can be a main relay for controlling battery heating, and the second switch unit K2 can be a fast charging relay for controlling battery charging.

[0046] Specifically, the isolation unit D is connected between the charging port and the second switch unit K2. Or, the isolation unit D is connected between the battery and the second switch unit K2.

[0047] It should be noted that the isolation unit D is an anti-backflow component, and the present application does not limit the isolation unit D. For example, the isolation unit D can be a unidirectional thyristor, a diode, or a component including a diode.

[0048] Optionally, the isolation unit D includes a diode, the positive pole of the diode is connected to the charging port, and the negative pole of the diode is connected to the battery.

[0049] It should be noted that in the traditional technology, when there is no isolation unit, and the first switch unit K1 and the second switch unit K2 of the battery are connected in series, if the battery is heated and charged simultaneously, and the first switch unit K1 and the second switch unit K2 are turned on, during the process of the power module charging the battery, the current will flow through the first switch unit K1 and the second switch unit K2 and flow into the charging device through the charging port, causing damage to the battery and the charging device.

[0050] It can be understood that when the battery is charged by the charging device connected in series through the charging port and the current charges the battery through the power module, the isolation unit D can prevent the current in the heating circuit from flowing into the charging device through the closed second switch unit K2. Moreover, due to the one-way conductivity of the diode, allowing current to flow in one direction and hardly conducting in the other direction, it can enable the current at the charging port to flow into the battery, while the heating circuit conducts heating, preventing the current in the heating circuit from flowing into the charging device and causing damage to the charging device.

[0051] In some embodiments, as Figure 1 shown, the charging and heating circuit further includes a motor controller. The motor controller includes: a capacitor C and a motor control unit (MCU). The first end of the capacitor C is connected between the first end of the first switch unit K1 and the power module, and the second end of the capacitor C is connected between the second pole of the battery and the second end of the power module.

[0052] In the embodiments of the present application, the power module includes multiple parallel phase legs, and the motor includes multiple phase coils.

[0053] Exemplarily, as Figure 1 shown, the power module includes three parallel phase legs, and the motor includes three phase coils. The MCU is connected to the three-phase legs of the power module and is used to control the switching states of the upper and lower arms of the three-phase legs.

[0054] Among them, the first ends of the three-phase legs are all connected to the first pole of the battery, the second ends of the three-phase legs are connected to the second pole of the battery, the midpoints of the three-phase legs are respectively connected to the first ends of the three-phase coils, and the second ends of the three-phase coils are connected to the second end of the motor.

[0055] Among them, the midpoint of the phase leg is the connection point of the upper and lower arms of the phase leg.

[0056] Exemplarily, the upper arm of the phase leg may include a Metal-Oxide-Semiconductor Field-Effect Transistor (MOS), or the upper arm of the phase leg may also include a transistor and a diode connected in parallel.

[0057] It should be noted that for the introduction of the lower arm of the bridge arm, reference can be made to the introduction of the upper arm of the bridge arm, and this application will not elaborate on it.

[0058] When the upper arm of the bridge arm includes one MOS transistor and the lower arm of the bridge arm includes one MOS transistor, the first pole of the MOS transistor included in the upper arm of the bridge arm is connected to the first pole of the battery, the second pole of the MOS transistor included in the upper arm of the bridge arm is connected to the first pole of the one MOS transistor included in the lower arm of the bridge arm, and the first pole of the one MOS transistor included in the lower arm of the bridge arm is connected to the second pole of the battery.

[0059] When the upper arm of the bridge arm includes one transistor and one diode connected in parallel, the first end of the diode of the upper arm of the bridge arm is electrically connected to the second end of the transistor of the upper arm of the bridge arm, the second end of the diode of the upper arm of the bridge arm is electrically connected to the first end of the transistor of the upper arm of the bridge arm, and both the second end of the diode of the upper arm of the bridge arm and the first end of the transistor of the upper arm of the bridge arm are connected to the midpoint of the bridge arm. Both the first end of the diode of the upper arm of the bridge arm and the second end of the transistor of the upper arm of the bridge arm are connected to the first pole of the battery. The first end of the diode of the lower arm of the bridge arm is electrically connected to the second end of the transistor of the lower arm of the bridge arm, the second end of the diode of the lower arm of the bridge arm is electrically connected to the first end of the transistor of the lower arm of the bridge arm, both the first end of the diode of the lower arm of the bridge arm and the second end of the transistor of the lower arm of the bridge arm are connected to the midpoint of the bridge arm, and both the second end of the diode of the lower arm of the bridge arm and the first end of the transistor of the lower arm of the bridge arm are connected to the second pole of the battery.

[0060] Optionally, the three-phase bridge arm includes a first bridge arm, a second bridge arm, and a third bridge arm, and the three-phase coil includes a first coil L1, a second coil L2, and a third coil L3.

[0061] It should be noted that the number of phases of the power module is the same as the number of phases of the motor, and the lead wires at the midpoint (i.e., the midpoint of the bridge arm) between the upper arm and the lower arm of each phase of the bridge arm are connected to the corresponding phase of the motor stator winding (i.e., the three-phase coil).

[0062] Exemplarily, as Figure 1 shown, the first bridge arm includes: a first upper arm and a first lower arm, the second bridge arm includes: a second upper arm and a second lower arm, and the third bridge arm includes: a third upper arm and a third lower arm.

[0063] The first upper bridge arm includes: a first upper bridge arm transistor S1 and a first upper bridge arm diode D1. The first end of the first upper bridge arm diode D1 is electrically connected to the second end of the first upper bridge arm transistor S1, and the second end of the first upper bridge arm diode D1 is electrically connected to the first end of the first upper bridge arm transistor S1. The second end of the first upper bridge arm diode D1 and the first end of the first upper bridge arm transistor S1 are both electrically connected to the first coil L1. The first end of the first upper bridge arm diode D1 and the second end of the first upper bridge arm transistor S1 are both electrically connected to the first pole of the battery. The first end of the first lower bridge arm diode D4 is electrically connected to the second end of the first lower bridge arm transistor S4, and the second end of the first lower bridge arm diode D4 is electrically connected to the first end of the first lower bridge arm transistor S4. The first end of the first lower bridge arm diode D4 and the second end of the first lower bridge arm transistor S4 are both electrically connected to the first coil L1. The second end of the first lower bridge arm diode D4 and the first end of the first lower bridge arm transistor S4 are both electrically connected to the second pole of the battery.

[0064] The second upper bridge arm includes: a second upper bridge arm transistor S2 and a second upper bridge arm diode D2. The first end of the second upper bridge arm diode D2 is electrically connected to the second end of the second upper bridge arm transistor S2, and the second end of the second upper bridge arm diode D2 is electrically connected to the first end of the second upper bridge arm transistor S2. The second end of the second upper bridge arm diode D2 and the first end of the second upper bridge arm transistor S2 are both electrically connected to the second coil L2. The first end of the second upper bridge arm diode D2 and the second end of the second upper bridge arm transistor S2 are both electrically connected to the first pole of the battery. The first end of the second lower bridge arm diode D5 is electrically connected to the second end of the second lower bridge arm transistor S5, and the second end of the second lower bridge arm diode D5 is electrically connected to the first end of the second lower bridge arm transistor S5. The first end of the second lower bridge arm diode D5 and the second end of the second lower bridge arm transistor S5 are both electrically connected to the second coil L2. The second end of the second lower bridge arm diode D5 and the first end of the second lower bridge arm transistor S5 are both electrically connected to the second pole of the battery.

[0065] The third upper bridge arm includes a third upper bridge arm transistor S3 and a third upper bridge arm diode D3. The first end of the third upper bridge arm diode D3 is electrically connected to the second end of the third upper bridge arm transistor S3, and the second end of the third upper bridge arm diode D3 is electrically connected to the first end of the third upper bridge arm transistor S3. The second end of the third upper bridge arm diode D3 and the first end of the third upper bridge arm transistor S3 are both electrically connected to the third coil L3. The first end of the third upper bridge arm diode D3 and the second end of the third upper bridge arm transistor S3 are both electrically connected to the first pole of the battery. The first end of the third lower bridge arm diode D6 is electrically connected to the second end of the third lower bridge arm transistor S6, and the second end of the third lower bridge arm diode D6 is electrically connected to the first end of the third lower bridge arm transistor S6. The first end of the third lower bridge arm diode D6 and the second end of the third lower bridge arm transistor S6 are both electrically connected to the third coil L3. The second end of the third lower bridge arm diode D6 and the first end of the third lower bridge arm transistor S6 are both electrically connected to the second pole of the battery.

[0066] In some embodiments, as Figure 1 shown, the charging and heating system further includes a battery management module (i.e., a Battery Management System (BMS)).

[0067] Wherein, the battery management module is connected to the first switch unit K1 and the second switch unit K2 of the charging and heating circuit, and is used to control the first switch unit K1 and the second switch unit K2 to conduct or disconnect based on the current demand of the battery. The current demand of the battery includes: charging while heating, only charging without heating, and only heating without charging.

[0068] In a possible design, when it is necessary to charge and heat the battery simultaneously, the second switch unit K2 is configured to conduct, so that the battery and the charging device form a charging circuit. And, the first switch unit K1 is configured to conduct, so that the battery, the power module, and the motor form a heating circuit. The isolation unit D allows current to flow from the charging port to the battery and blocks current from flowing from the battery to the charging port.

[0069] In this way, after the second switch unit K2 conducts, the charging device can directly charge the battery through the charging port. After the first switch unit K1 conducts, the power module realizes battery heating. The isolation unit D can make the charging current flow into the battery unidirectionally, block the battery from discharging reversely to the charging device, and avoid equipment damage caused by energy backflow, thereby improving the system reliability. In this way, the user does not need to wait for the battery to warm up, and charging and heating can be carried out simultaneously, shortening the waiting time.

[0070] It should be noted that during the battery heating process, the charging and heating circuit includes switching between a first stage and a second stage.

[0071] Optionally, in the case where the battery needs to be charged and heated simultaneously, in the first stage, the battery management module is used to control the upper arm of the first bridge arm and / or the second bridge arm, and the lower arm of the third bridge arm to conduct forward. The current from the charging port charges the first coil L1 and / or the second coil L2, and the third coil L3. Forward conduction means conduction from the first end of the bridge arm to the midpoint of the bridge arm. In the second stage, the lower arm of the first bridge arm and / or the second bridge arm, and the upper arm of the third bridge arm conduct reversely, and the first coil L1 and / or the second coil L2, and the third coil L3 discharge to the battery. Reverse conduction means conduction from the second end of the bridge arm to the midpoint of the bridge arm.

[0072] Exemplarily, as Figure 2 shown, the charging port is connected in series with the charging device. In the case where the battery needs to be charged and heated simultaneously, the second switch unit K2 conducts, so that the charging device, the charging port, the isolation unit D, the second switching element, and the battery form a charging circuit. In the first stage, the first switch unit K1, the first upper arm transistor S1, the second upper arm transistor S2, and the third lower arm transistor S6 conduct, so that the first switch unit K1, the first upper arm transistor S1, the second upper arm transistor S2, the first coil L1, the second coil L2, the third coil L3, the third lower arm transistor S6, and the battery form a first-stage heating circuit.

[0073] In this way, a part of the current output by the charging device connected in series with the charging port flows through the second switch unit K2 and flows into the first pole of the battery (i.e., the positive electrode of the battery) to charge the battery. Another part of the current output by the charging device connected in series with the charging port flows through the first upper arm transistor S1 and the first coil L1, and the second upper arm transistor S2 and the second coil L2 respectively, and then all the currents converge at the third coil L3 and flow through the third lower arm transistor S6, thereby charging the three-phase coils.

[0074] Exemplarily, as Figure 3 shown, the charging port is connected in series with the charging device. In the case where the battery needs to be charged and heated simultaneously, the second switch unit K2 conducts, so that the charging device, the charging port, the isolation unit D, the second switching element, and the battery form a charging circuit. In the second stage, the first switch unit K1 conducts, and the first upper arm transistor S1, the second upper arm transistor S2, the third upper arm transistor S3, the first lower arm transistor S4, the second lower arm transistor S5, and the third lower arm transistor S6 do not conduct. The third coil L3, the third upper arm diode D3, the first switch unit K1, the battery, the first lower arm diode D4, the second lower arm diode D5, the first coil L1, and the second coil L2 form a second-stage heating circuit.

[0075] In this way, all the current output by the charging device connected in series to the charging port flows into the battery to charge the battery. At the same time, the current stored in the three-phase coil can be released through the third upper-bridge diode D3, the first lower-bridge diode D4, and the second lower-bridge diode D5 to charge the battery.

[0076] In some embodiments, when the voltage of the three-phase coil is higher than the voltage of the charging device, the charging device is controlled to stop output.

[0077] Exemplarily, as Figure 4 shown, the second switching unit K2 is turned on, and the charging device connected in series to the charging port does not output current. In the second stage, the first switching unit K1 is turned on, and the first upper-bridge transistor S1, the second upper-bridge transistor S2, the third upper-bridge transistor S3, the first lower-bridge transistor S4, the second lower-bridge transistor S5, and the third lower-bridge transistor S6 are not turned on. The third coil L3, the third upper-bridge diode D3, the first switching unit K1, the battery, the first lower-bridge diode D4, the second lower-bridge diode D5, the first coil L1, and the second coil L2 form a second-stage heating circuit.

[0078] In this way, the charging device and the battery can be protected.

[0079] It can be understood that through the charging and heating circuit composed of the battery, the power module, the motor, the charging port, the first switching unit K1, the second switching unit K2, and the isolation unit D, it is possible to charge and heat the battery simultaneously. When it is necessary to charge and heat the battery simultaneously, the three-phase bridge arm can be controlled in the first stage and the second stage to achieve pulsed heating of the battery.

[0080] In another possible design, when it is necessary to charge the battery only without heating, the second switching unit K2 is configured to be turned on so that the battery and the charging device form a charging circuit. The first switching unit K1 is configured to be turned off. When it is necessary to heat the battery only without charging, the first switching unit K1 is configured to be turned on so that the battery, the power module, and the motor form a heating circuit. The second switching unit K2 is configured to be turned off.

[0081] It can be understood that when it is necessary to charge the battery only without heating, the current can charge the battery through the turned-on second switching unit K2. When it is necessary to heat the battery only without charging, the current can heat the battery through the turned-on first switching unit K1.

[0082] In some embodiments, as Figure 5 shown, the charging and heating circuit further includes a third switching unit K3, and the third switching unit K3 is connected in parallel with the isolation unit D.

[0083] Among them, the battery management module is connected to the third switch unit K3 and is used to control the first switch unit K1, the second switch unit K2, and the third switch unit K3 to be turned on or off based on the current requirements of the battery.

[0084] Exemplarily, the third switch unit K3 is configured to be turned on when the battery is only charged without being heated.

[0085] It can be understood that when the battery is only charged without being heated, the third switch unit K3 is turned on, so that the current can directly flow through the third switch unit K3 to charge the battery without passing through the isolation unit D. In this way, the current power for charging the battery can be made larger, thereby accelerating the battery charging speed.

[0086] Alternatively, the third switch unit K3 can be configured to be turned on in the first stage and turned off in the second stage.

[0087] It should be noted that the third switch unit K3 can be turned on when the battery is only charged without being heated; the third switch unit K3 can also be turned on in the first stage when the battery is charged and heated simultaneously.

[0088] It can be understood that when the third switch unit K3 is turned on in the first stage, the current power can be made larger without flowing into the charging device, which can accelerate the battery charging speed. When the third switch unit K3 is turned off in the second stage, it can avoid the current flowing into the charging device in the second stage and causing damage to the charging device.

[0089] On this basis, the present application provides a charging and heating method, which is applied to the above-mentioned charging and heating circuit, as Figure 6 shown, the charging and heating method includes: S601. Obtain the current status information of the battery.

[0090] Among them, the current status information of the battery includes at least one of the following: the current temperature of the battery, the current power of the battery.

[0091] In a possible implementation manner, the battery can be monitored in real time to obtain the current status information of the battery.

[0092] S602. Obtain status requirement information based on the current status information, preset charging conditions, and preset heating conditions.

[0093] Among them, the preset charging conditions are used to indicate whether the battery needs to be charged currently, the preset heating conditions are used to indicate whether the battery needs to be heated currently, and the status requirement information is used to indicate whether the battery needs to be charged and whether it needs to be heated.

[0094] It should be noted that this application does not limit the preset charging conditions. For example, the preset charging conditions can be whether the charge-discharge circuit has completed the preparations before charging. The charge-discharge circuit's completion of the preparations before charging can be that the current battery power is lower than the preset power threshold, or that the charging device is connected to the charging port.

[0095] Optionally, the preset charging condition is: the current battery power is lower than the preset power threshold, and the preset heating condition is: the current battery temperature is lower than the preset temperature threshold.

[0096] In a possible implementation, when the current temperature of the battery is lower than the preset temperature threshold and the current battery power is lower than the preset power threshold, status demand information is obtained. The status demand information is used to indicate that the battery needs to be charged and heated simultaneously. When the current temperature of the battery is higher than the preset temperature threshold and the current battery power is lower than the preset power threshold, status demand information is obtained. The status demand information is used to indicate that the battery needs to be charged. When the current temperature of the battery is lower than the preset temperature threshold and the current battery power is higher than the preset power threshold, status demand information is obtained. The status demand information is used to indicate that the battery needs to be heated. When the current temperature of the battery is higher than the preset temperature threshold and the current battery power is higher than the preset power threshold, the current status information of the battery is obtained. The status demand information is used to indicate that the battery does not need to be charged and does not need to be heated.

[0097] S603. When the status demand information indicates that the battery needs to be charged and heated simultaneously, a first control instruction is issued.

[0098] Among them, the first control instruction includes: the first charging demand power when the battery is charging, and the first heating demand temperature when the battery is heating. The first control instruction is used to control both the first switch unit and the second switch unit in the charging and heating circuit to conduct.

[0099] In this way, by obtaining the first charging demand power and the first heating demand temperature, the actual tolerable charging power and the target heating temperature in the current state can be accurately determined, preventing overcharging or overheating when the battery needs to be charged and heated simultaneously, thereby ensuring the safety of the battery.

[0100] In a possible implementation, when the status demand information indicates that the battery needs to be charged and heated simultaneously, the battery management function can be started and a first control instruction is issued.

[0101] Optionally, the battery management function includes: a pulse heating function and a DC charging function.

[0102] It should be noted that the pulse heating function is used to control the battery to enter the heating state, so as to heat the battery; the DC charging function is used to control the battery to enter the charging state, so as to charge the battery.

[0103] In a possible design, the pulse heating function and the DC charging function can be started simultaneously, enabling the battery to enter a state of charging while being pulse-heated.

[0104] It should be noted that when the DC charging function is started, the output voltage and output current of the charging device can be requested based on the charging demand power of the battery to control the charging power of the battery.

[0105] Based on the above technical solution, by obtaining the current state information, preset charging conditions, and preset heating conditions of the battery, the state demand information of the battery can be determined, thereby determining whether the battery needs charging and heating. When the state demand information indicates that the battery needs to be charged and heated simultaneously, a first control instruction can be issued to control both the first switch unit and the second switch unit in the charging and heating circuit to conduct, thereby realizing simultaneous charging and heating of the battery. In this way, the charging and heating requirements of the battery can be satisfied simultaneously, reducing the time required for the battery to reach the working state, and thus improving the startup efficiency.

[0106] In some embodiments, when the state demand information indicates that the battery needs to be charged only without heating, a second control instruction is issued, and the second control instruction is used to control the first switch unit to disconnect and the second switch unit to conduct. When the state demand information indicates that the battery needs to be heated only without charging, a third control instruction is issued, and the third control instruction is used to control the first switch unit to conduct and the second switch unit to disconnect.

[0107] Optionally, the second control instruction further includes a second charging demand power for indicating the case when the battery is charged. The third control instruction further includes a second heating demand temperature for indicating the case when the battery is heated.

[0108] In this way, the actual chargeable power that the battery can withstand when it needs to be charged only without heating can be accurately determined through the second charging demand power, and the battery can be accurately controlled to reach an appropriate temperature when it needs to be heated only without charging through the second heating demand temperature. This prevents the battery from being overcharged when it needs to be charged only without heating and from overheating when it needs to be heated only without charging, thus ensuring the safety of the battery.

[0109] In a possible implementation manner, the pulse heating function can be started to enter the pulse heating state. After that, a second control instruction can be issued. The DC charging function can be started to enter the DC charging state.

[0110] It should be understood that when the battery does not need heating or charging, the pulse heating function and the DC charging function may not be started.

[0111] It can be understood that through the second control instruction and the third control instruction, the conduction or disconnection of the first switch unit and the second switch unit can be controlled, so that only charging without heating or only heating without charging of the battery can be achieved. In this way, according to the state demand information of the battery, the current charging and heating demand situation of the battery can be determined to heat or charge the battery, ensuring that the battery is in a normal working environment, thereby extending the battery life.

[0112] In some embodiments, when the pulse heating function is started, the switching sequence and duty cycle of the power switch can be controlled based on the first control instruction to control the current and power of the pulse heating, so as to generate a high-frequency pulse current at both ends of the battery.

[0113] It should be noted that during the process of generating a high-frequency pulse current at both ends of the battery, each cycle includes a first stage and a second stage. Among them, in the first stage, the battery discharges, and the current flows out of the battery and into the three-phase coil to charge the three-phase coil. During this process, the MCU can control the motor based on the Space Vector Pulse Width Modulation (SVPWM) technology, and control the on-off sequence of the first arm, the second arm, and the third arm with the motor torque equal to zero as the target, and control the duty cycle of each power switch based on the effective value of the current required for battery heating. In the second stage, the MCU can control the first arm, the second arm, and the third arm to be all turned off to release the energy stored in the three-phase coil in the first stage to charge the battery. The first stage and the second stage are alternately carried out to obtain the high-frequency pulse current required for battery pulse heating. After that, a large amount of heat can be generated when the high-frequency pulse current flows through the internal resistance of the battery, thereby realizing the pulse heating of the battery. The frequency of the high-frequency pulse current can be adjusted based on the requirements of the battery.

[0114] It should be noted that the present application does not limit the conversion conditions for the alternation between the first stage and the second stage. For example, the conversion condition can be: if the energy stored in the three-phase coil in the first stage is greater than or equal to a preset energy threshold, then enter the second stage; if the energy stored in the three-phase coil in the second stage is less than or equal to the preset energy threshold, then enter the first stage. Another example, the conversion condition can be: if the duration of the first stage is greater than or equal to a preset charging time threshold, then enter the second stage; if the duration of the second stage is greater than or equal to a preset discharging time threshold, then enter the first stage. Another example, the conversion condition can be: if the battery voltage in the first stage is greater than or equal to a preset charging voltage threshold, then enter the second stage; if the battery voltage in the second stage is less than or equal to a preset discharging voltage threshold, then enter the first stage.

[0115] In an embodiment of the present application, the motor control unit can respond to the pulse heating instruction of the BMS, control the on and off of each phase of the switching tubes in the power module, generate a pulse current at both ends of the battery, and then perform pulse heating on the battery.

[0116] It should be noted that the MCU can control the current and power of pulse heating by controlling the switching sequence and duty cycle of the power switch.

[0117] In some embodiments, the BMS can be used to monitor the current state information of the battery in real time. Then, based on the current state information and the preset charging conditions, if the current state information meets the preset charging conditions, it is determined whether the current state information meets the preset heating conditions. If the current state meets the preset heating conditions, enter the state of charging while heating; if the current state does not meet the preset heating conditions, enter the state of only charging without heating. If the current state information does not meet the preset charging conditions, it is determined whether the current state information meets the preset heating conditions. If the current state meets the preset heating conditions, enter the state of only heating without charging; if the current state does not meet the preset heating conditions, do not charge and do not heat.

[0118] The above mainly introduces the solution provided by the embodiments of the present application from the perspective of methods. To implement the above functions, the charging and heating device includes the corresponding hardware structures and / or software modules for performing each function. Those skilled in the art should easily realize that, combining the units and algorithm steps of each example described in the embodiments disclosed herein, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed in the way of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present application.

[0119] The embodiments of the present application can divide the functional modules of the charging and heating device according to the above methods. For example, the charging and heating device can include each functional module corresponding to each functional division, or two or more functions can be integrated into one processing module. The above integrated modules can be implemented in the form of hardware or in the form of software functional modules. It should be noted that the division of modules in the embodiments of the present application is illustrative, only a logical function division, and there may be other division methods in actual implementation.

[0120] Referring to Figure 7 , the charging and heating device includes an acquisition module 701 and a processing module 702.

[0121] The acquisition module 701 is used to acquire the current state information of the battery.

[0122] A processing module 702 is configured to obtain status requirement information based on current status information, a preset charging condition, and a preset heating condition. The preset charging condition is used to indicate whether the battery needs to be charged currently, and the preset heating condition is used to indicate whether the battery needs to be heated currently. The status requirement information is used to indicate whether the battery needs to be charged and whether it needs to be heated. The processing module 702 is further configured to issue a first control instruction when the status requirement information indicates that the battery needs to be charged and heated simultaneously. The first control instruction is used to control both the first switch unit and the second switch unit in the charging and heating circuit to be turned on.

[0123] Regarding the device in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment related to the method, and will not be elaborated here.

[0124] As Figure 8 shown, the charging and heating device includes, but is not limited to: a processor 801 and a memory 802.

[0125] Among them, the above-mentioned memory 802 is used to store executable instructions of the above-mentioned processor 801. It can be understood that the above-mentioned processor 801 is configured to execute instructions to implement the charging and heating method in the above embodiment.

[0126] It should be noted that those skilled in the art can understand that Figure 8 the structure of the charging and heating device shown in Figure 8 does not constitute a limitation on the charging and heating device. The charging and heating device may include more or fewer components than

[0127] shown, or combine certain components, or have different component arrangements.

[0128] The memory 802 can be used to store software programs and various data. The memory 802 mainly includes a program storage area and a data storage area. Among them, the program storage area can store an operating system, application programs required by at least one functional module (such as a determination unit, a processing unit, etc.). In addition, the memory 802 can include high-speed random access memory, and can also include non-volatile memory, such as at least one magnetic disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0129] In an exemplary embodiment, there is also provided a computer-readable storage medium including instructions, such as the memory 802 including instructions. The above instructions can be executed by the processor 801 of the charging and heating device to implement the method in the above embodiment.

[0130] In actual implementation, Figure 7 the functions of the acquisition module 701 and the processing module 702 in Figure 8 can be implemented by the processor 801 in

[0131] calling the computer program stored in the memory 802. The specific execution process can refer to the description of the method part in the above embodiment, which will not be elaborated here.

[0132] In an exemplary embodiment, the embodiment of the present application also provides a computer program product including one or more instructions. The one or more instructions can be executed by the processor 801 of the charging and heating device to complete the method in the above embodiment.

[0133] It should be noted that when the instructions in the above computer-readable storage medium or the one or more instructions in the computer program product are executed by the processor of the charging and heating device, they implement each process of the above method embodiment and can achieve the same technical effects as the above method. To avoid repetition, it will not be elaborated here.

[0134] Through the description of the above embodiments, those skilled in the art can clearly understand that for the convenience and simplicity of description, only the above division of each functional module is used as an example. In actual applications, the above functions can be allocated to different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above.

[0135] In several embodiments provided by this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of modules or units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed. Another point is that the displayed or discussed couplings or direct couplings or communication connections to each other can be through some interfaces. The indirect couplings or communication connections of devices or units can be in electrical, mechanical or other forms.

[0136] The units described as separate components may or may not be physically separated. The components displayed as units may be one physical unit or multiple physical units, that is, they can be located in one place, or they can be distributed to multiple different places. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0137] In addition, in each embodiment of this application, the functional units can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit. The above-mentioned integrated units can be implemented in the form of hardware or in the form of software functional units.

[0138] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a readable storage medium. Based on such an understanding, the technical solution of the embodiments of this application, in essence, or the part that contributes to the prior art, or all or part of this technical solution, can be embodied in the form of a software product. This software product is stored in a storage medium and includes several instructions to enable a device (which can be a single-chip microcomputer, a chip, etc.) or a processor to execute all or part of the steps of the methods of the various embodiments of this application. The aforementioned storage medium includes: USB flash drives, mobile hard disks, ROM, RAM, magnetic disks, optical disks and other various media that can store program codes.

[0139] The above is only the specific implementation manner of this application, but the protection scope of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in this application should be covered by the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims

1. A charging and heating circuit, characterized in that, Comprising: A battery; A power module, the first end of the power module is connected to the first pole of the battery, and the second end of the power module is connected to the second pole of the battery; A motor, connected to the third end of the power module; A charging port, connected between the first pole and the second pole of the battery; the charging port is used to connect to a charging device; A first switch unit (K1), connected between the battery and the power module; A second switch unit (K2), an isolation unit and the first switch unit (K1), connected in series between the battery and the charging port; In the case where it is necessary to charge and heat the battery simultaneously, the second switch unit (K2) is configured to be turned on so that the battery and the charging device form a charging circuit; and, the first switch unit (K1) is configured to be turned on so that the battery, the power module and the motor form a heating circuit; the isolation unit allows current to flow from the charging port to the battery and blocks current from flowing from the battery to the charging port.

2. The charging and heating circuit according to claim 1, wherein The isolation unit includes a diode, the positive pole of the diode is connected to the charging port, and the negative pole of the diode is connected to the battery.

3. The charging and heating circuit according to claim 1, wherein, The isolation unit is connected between the charging port and the second switch unit (K2); or, The isolation unit is connected between the battery and the second switch unit (K2).

4. The charging and heating circuit according to claim 1, wherein In the case where it is necessary to charge the battery only without heating, the second switch unit (K2) is configured to be turned on so that the battery and the charging device form a charging circuit; the first switch unit (K1) is configured to be turned off; In the case where it is necessary to heat the battery only without charging, the first switch unit (K1) is configured to be turned on so that the battery, the power module and the motor form a heating circuit; the second switch unit (K2) is configured to be turned off.

5. The charging and heating circuit according to claim 4, wherein The charging and heating circuit further includes a third switch unit (K3), connected in parallel with the isolation unit; The third switch unit (K3) is configured to be turned on in the case where the battery is charged only without heating.

6. The charging and heating circuit according to any one of claims 1-5, characterized in that, The first switch unit (K1) is connected between the first pole of the battery and the first end of the power module; The second switch unit (K2) and the isolation unit are connected between the first pole of the battery and the charging port.

7. The charging and heating circuit according to claim 5, wherein The power module includes three-phase bridge arms connected in parallel, and the motor includes three-phase coils; the first end of the three-phase bridge arms is connected to the first pole of the battery, the second end of the three-phase bridge arms is connected to the second pole of the battery, the midpoints of the three-phase bridge arms are respectively connected to the first ends of the three-phase coils, and the midpoint of the bridge arm is the connection point of the upper bridge arm and the lower bridge arm of the bridge arm; The three-phase bridge arms include a first bridge arm, a second bridge arm and a third bridge arm, and the three-phase coils include a first coil (L1), a second coil (L2) and a third coil (L3); In the case where the battery needs to be charged and heated simultaneously, in the first stage, the upper arms of the first bridge arm and / or the second bridge arm, and the lower arm of the third bridge arm conduct forwardly, and the current from the charging port charges the first coil (L1) and / or the second coil (L2), and the third coil (L3); the forward conduction is from the first end of the bridge arm to the midpoint of the bridge arm. In the second stage, the lower arms of the first bridge arm and / or the second bridge arm, and the upper arm of the third bridge arm conduct reversely, and the first coil (L1) and / or the second coil (L2), and the third coil (L3) discharge to the battery; the reverse conduction is from the second end of the bridge arm to the midpoint of the bridge arm.

8. The charging and heating circuit according to claim 7, wherein The third switching unit (K3) is configured to conduct in the first stage and disconnect in the second stage.

9. A charging and heating method, characterized in that, Applied to the charging and heating circuit according to any one of claims 1-8, the method includes: Obtaining the current state information of the battery; Based on the current state information, preset charging conditions and preset heating conditions, obtaining state demand information, where the preset charging conditions are used to indicate whether the battery needs to be charged currently, the preset heating conditions are used to indicate whether the battery needs to be heated currently, and the state demand information is used to indicate whether the battery needs to be charged and whether it needs to be heated; In the case where the state demand information indicates that the battery needs to be charged and heated simultaneously, issuing a first control instruction, where the first control instruction is used to control both the first switching unit and the second switching unit in the charging and heating circuit to conduct.

10. The charging and heating method according to claim 9, characterized in that, The method further includes: In the case where the state demand information indicates that the battery needs to be charged only without heating, issuing a second control instruction, where the second control instruction is used to control the first switching unit to disconnect and the second switching unit to conduct; In the case where the state demand information indicates that the battery needs to be heated only without charging, issuing a third control instruction, where the third control instruction is used to control the first switching unit to conduct and the second switching unit to disconnect.

11. The charging and heating method according to claim 10, wherein The first control instruction further includes a first charging demand power for indicating the case of charging the battery, and a first heating demand temperature for indicating the case of heating the battery; The second control instruction further includes a second charging demand power for indicating the case of charging the battery; The third control instruction further includes a second heating demand temperature for indicating the case of heating the battery.

12. A charging and heating system, characterized in that, The charging and heating system includes: The charging and heating circuit according to any one of claims 1-8; A battery management module, connected to the first switching unit and the second switching unit of the charging and heating circuit, for controlling the first switching unit and the second switching unit to conduct or disconnect based on the current demand of the battery; the current demand of the battery includes: charging and heating simultaneously, charging only without heating, heating only without charging.

13. The charging and heating system according to claim 12, wherein, The charging and heating circuit further includes a motor control unit, connected to the three-phase bridge arms of the power module, for controlling the switching states of the upper arms and the lower arms of the three-phase bridge arms.

14. A vehicle, characterized in that, The vehicle includes the charging and heating system according to claim 12.

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