Battery heating device and vehicle

Abstract

The present disclosure relates to a battery heating device and a vehicle, the battery heating device comprising a controller, a power battery, a target winding and a target bridge arm, the power battery comprising a first battery module and a second battery module connected in series; a first end of the target winding is connected to a negative electrode of the first battery module and a positive electrode of the second battery module, and a second end of the target winding is connected to a midpoint of the target bridge arm; a first end of the target bridge arm is connected to a positive electrode of the first battery module, and a second end of the target bridge arm is connected to a negative electrode of the second battery module; the controller is connected to the target bridge arm, and the controller is configured to: in a parked heating mode, control the target bridge arm to alternately charge and discharge the first battery module and the second battery module, so as to heat the power battery. Not only the heating demand of the power battery can be met, but also the stability of the total voltage of the power battery can be ensured.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of battery heating, in particular to a battery heating device and a vehicle. BACKGROUND

[0002] With the development of new energy vehicle technology, users have increasingly high experience requirements for new energy vehicles. As a key component in new energy vehicles, batteries have the most direct impact on cost reduction for enterprises and user experience; new energy vehicle batteries are affected by temperature, and the electrical performance of the battery decreases at low temperatures, which seriously affects the discharge performance of the power battery, thereby causing problems such as reduced driving range and limited output power during driving. Therefore, the power battery must be heated to raise the temperature of the power battery body, thereby ensuring that the performance of the electric vehicle is less affected under cold conditions. SUMMARY

[0003] The purpose of the present disclosure is to provide a battery heating device and a vehicle.

[0004] To achieve the above purpose, the first aspect of the present disclosure provides a battery heating device, comprising a controller, a power battery, a target winding and a target bridge arm, the power battery comprising a first battery module and a second battery module connected in series;

[0005] The first end of the target winding is connected to the negative electrode of the first battery module and the positive electrode of the second battery module, and the second end of the target winding is connected to the midpoint of the target bridge arm;

[0006] The first end of the target bridge arm is connected to the positive electrode of the first battery module, and the second end of the target bridge arm is connected to the negative electrode of the second battery module;

[0007] The controller is connected to the target bridge arm, and the controller is configured to control the target bridge arm to alternately charge and discharge the first battery module and the second battery module to heat the power battery in a parked heating mode.

[0008] Optionally, further comprising:

[0009] A load, the first end of the load being connected to the first end of the target bridge arm, and the second end of the load being connected to the second end of the target bridge arm;

[0010] The controller is configured to:

[0011] In an equalization heating power supply mode, the target bridge arm is controlled so that the first battery module and the second battery module jointly supply power to the load, and equalization between the first battery module and the second battery module is achieved.

[0012] Optionally, when the first voltage of the first battery module is greater than the second voltage of the second battery module, the controller is configured to:

[0013] In a first time period of the equalization and heating power supply mode, the upper bridge arm of the target bridge arm is controlled to be turned on, and the lower bridge arm is controlled to be turned off, the first battery module and the second battery module jointly supply power to the load, and the target winding stores energy;

[0014] In a second time period of the equalization and heating power supply mode, the lower bridge arm of the target bridge arm is controlled to be turned on, and the upper bridge arm is controlled to be turned off, the first battery module and the second battery module jointly supply power to the load, and the target winding releases the energy stored to charge the second battery module.

[0015] Optionally, when the first voltage of the first battery module is less than the second voltage of the second battery module, the controller is configured to:

[0016] In a first time period of the equalization and heating power supply mode, the lower bridge arm of the target bridge arm is controlled to be turned on, and the upper bridge arm is controlled to be turned off, the first battery module and the second battery module jointly supply power to the load, and the target winding stores energy;

[0017] In a second time period of the equalization and heating power supply mode, the upper bridge arm of the target bridge arm is controlled to be turned on, and the lower bridge arm is controlled to be turned off, the first battery module and the second battery module jointly supply power to the load, and the target winding releases the energy stored to charge the first battery module.

[0018] Optionally, the controller is configured to:

[0019] In a first half cycle in the parking heating mode, the target bridge arm is controlled so that the first battery module discharges to charge the second battery module;

[0020] In a second half cycle in the parking heating mode, the target bridge arm is controlled so that the second battery module discharges to charge the first battery module;

[0021] The first half cycle and the second half cycle are alternately executed.

[0022] Optionally, the controller is configured to:

[0023] In a first time period of the first half cycle in the parking heating mode, the upper bridge arm of the target bridge arm is controlled to be turned on, and the lower bridge arm is controlled to be turned off, the first battery module discharges, and the target winding stores energy;

[0024] In a second time period of the first half cycle in the parking heating mode, the lower bridge arm of the target bridge arm is turned on and the upper bridge arm is turned off, the target winding releases stored energy to charge the second battery module.

[0025] Optionally, the controller is configured to:

[0026] In a first time period of the second half cycle in the parking heating mode, the lower bridge arm of the target bridge arm is turned on and the upper bridge arm is turned off, the second battery module is discharged, and the target winding stores energy;

[0027] In a second time period of the second half cycle in the parking heating mode, the upper bridge arm of the target bridge arm is turned on and the lower bridge arm is turned off, the target winding releases stored energy to charge the first battery module.

[0028] Optionally, it further comprises a bus capacitor, a first end of the bus capacitor is connected with a first end of the target bridge arm, and a second end of the bus capacitor is connected with a second end of the target bridge arm; the load comprises at least one driving load;

[0029] The controller is configured to:

[0030] In the first half cycle in the driving heating mode, the target bridge arm is controlled so that the first battery module is discharged, the first battery module or the bus capacitor supplies power to the driving load to drive the vehicle, and charges the second battery module;

[0031] In the second half cycle in the driving heating mode, the target bridge arm is controlled so that the second battery module is discharged, the second battery module or the bus capacitor supplies power to the driving load to drive the vehicle, and charges the first battery module.

[0032] Optionally, the controller is configured to:

[0033] In a first time period of the first half cycle in the driving heating mode, the upper bridge arm of the target bridge arm is turned on and the lower bridge arm is turned off, the first battery module is discharged, the target winding stores energy, and the bus capacitor supplies power to the driving load;

[0034] In a second time period of the first half cycle in the driving heating mode, the lower bridge arm of the target bridge arm is turned on and the upper bridge arm is turned off, the first battery module is discharged to charge the bus capacitor and supply power to the driving load, and the target winding releases stored energy to the second battery module to charge the second battery module.

[0035] Optionally, the controller is configured to:

[0036] In a first time period of a second half cycle of the driving heating mode, the lower bridge arm of the target bridge arm is turned on, and the upper bridge arm is turned off, the second battery module is discharged, the target winding stores energy, and the bus capacitor supplies power to the driving load;

[0037] In a second time period of the second half cycle of the driving heating mode, the upper bridge arm of the target bridge arm is turned on, and the lower bridge arm is turned off, the second battery module is discharged to charge the bus capacitor and supply power to the driving load, and the target winding releases the stored energy to the first battery module to charge the first battery module.

[0038] Optionally, the bridge arm of the motor controller is reused as the target bridge arm, and the coil of the motor is reused as the target winding.

[0039] Optionally, it further comprises a first target switch, a first end of the first target switch being connected with the negative electrode of the first battery module and the positive electrode of the second battery module, and a second end of the first target switch being connected with the N line led out by the motor;

[0040] The controller is configured to: when receiving a driving instruction, control the first target switch to be turned off to perform the driving mode;

[0041] When receiving a parking heating request instruction, a driving heating request instruction, or an equalization heating power supply request instruction, the first target switch is controlled to be turned on to enter the corresponding mode.

[0042] Optionally, it further comprises:

[0043] a second target switch, a first end of the second target switch being connected with the negative electrode of the first battery module and the positive electrode of the second battery module, and a second end of the second target switch being connected with the N line led out by the motor;

[0044] a third target switch, a first end of the third target switch being connected with the N line led out by the motor, and a second end of the third target switch being connected with the motor of the electric drive system;

[0045] The controller is configured to: in the multi-electric drive cooperative driving mode, control the second target switch to be turned off, and the third target switch to be turned on or turned off, to realize the multi-electric drive cooperative driving.

[0046] When receiving a parking heating request instruction, a driving heating request instruction, or an equalization heating power supply request instruction, the second target switch is controlled to be turned on, and the third target switch is controlled to be turned off, to enter the corresponding mode.

[0047] A second aspect of the present disclosure provides a vehicle comprising the battery heating device of the first aspect.

[0048] The technical scheme, by providing a battery heating device, comprising a controller, a power battery, a target winding and a target bridge arm, the power battery comprises a first battery module and a second battery module connected in series; the first end of the target winding is connected to the negative electrode of the first battery module and the positive electrode of the second battery module, and the second end of the target winding is connected to the midpoint of the target bridge arm; the first end of the target bridge arm is connected to the positive electrode of the first battery module, and the second end of the target bridge arm is connected to the negative electrode of the second battery module; the controller is connected with the target bridge arm, and the controller is configured to control the target bridge arm to make the first battery module and the second battery module alternately charge and discharge in the parking heating mode, so as to realize the heating of the power battery. In this way, the first battery module and the second battery module can be connected to the same target winding, and the first battery module and the second battery module can be alternately charged and discharged through the target winding by controlling the target bridge arm. Not only the heating demand of the power battery can be met, but also the charging can be staggered, thereby ensuring the stability of the total voltage of the power battery, and the reliability of the vehicle power supply is improved.

[0049] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF DRAWINGS

[0050] The accompanying drawings are included to provide a further understanding of the present disclosure and constitute a part of the specification, and are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation on the present disclosure. In the drawings:

[0051] Figure 1 is a schematic diagram of a battery internal heating principle according to an example embodiment of the present disclosure;

[0052] Figure 2 is a circuit diagram of a battery heating device according to an example embodiment of the present disclosure;

[0053] Figure 3 is a schematic diagram of current flow during power battery heating according to an example embodiment of the present disclosure;

[0054] Figure 4 is a schematic diagram of current flow during winding discharging according to an example embodiment of the present disclosure; Figure 3

[0055] Figure 5 is a schematic diagram of current flow during winding discharging according to an example embodiment of the present disclosure;

[0056] Figure 6 is a schematic diagram of current flow during winding discharging according to an example embodiment of the present disclosure; Figure 5 ​The embodiment shown illustrates a schematic diagram of the current flow direction during a winding discharge process;

[0057] Figure 7 This is a schematic diagram of the current flow direction in another winding energy storage process according to an exemplary embodiment of this disclosure;

[0058] Figure 8 It is based on Figure 7 The embodiment shown illustrates a schematic diagram of the current flow direction during a winding discharge process;

[0059] Figure 9 This is a schematic diagram of the current flow in another winding energy storage process according to an exemplary embodiment of the present disclosure;

[0060] Figure 10 It is based on Figure 9 The embodiment shown illustrates a schematic diagram of the current flow direction during a winding discharge process;

[0061] Figure 11 This is a schematic diagram of the current flow in another winding energy storage process according to an exemplary embodiment of the present disclosure;

[0062] Figure 12 It is based on Figure 11 The embodiment shown illustrates a schematic diagram of the current flow direction during a winding discharge process;

[0063] Figure 13 This is a schematic diagram of the current flow in another winding energy storage process according to an exemplary embodiment of the present disclosure;

[0064] Figure 14 It is based on Figure 13 The embodiment shown illustrates a schematic diagram of the current flow direction during a winding discharge process;

[0065] Figure 15 It is based on Figure 2 The illustrated embodiment shows a circuit diagram of a battery heating device;

[0066] Figure 16 It is based on Figure 2 The illustrated embodiment shows a circuit diagram of another battery heating device. Detailed Implementation

[0067] The specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present disclosure, and are not used to limit the present disclosure. Before detailing the specific embodiments of the present disclosure, first, the application scenarios of the present disclosure are described as follows: the present disclosure can be applied to a heating scenario of a battery, for example, a heating process of a power battery in a vehicle or a battery in an electronic device in a low-temperature environment. Here, the heating of the power battery is taken as an example for description. In the related art, the heating mode of the vehicle is mostly as follows: the PTC (Positive Temperature Coefficient, thermistor) is used to heat the power battery at low temperature. The heating principle is that when the temperature of the power battery is detected to be too low, the switch tube inside the battery heater is turned on to make the heating resistor work by being powered on, so as to generate high temperature. The generated high temperature flows into the power battery through a water channel or an air channel, so as to increase the temperature of the power battery. Some vehicles also use an internal heating mode, that is, a large current flows through the internal resistance of the battery, and the internal resistance of the battery generates heat (if the equivalent internal resistance of the battery is r, the current is i, and the time is t, the internal resistance generates heat of i 2 However, due to the external heating mode, the high-voltage system of the vehicle needs to additionally distribute power to the battery heater (such as the thermistor), and also needs to distribute power to the water channel or the air channel, the pipeline, the low-voltage system, etc., thereby increasing the total cost. In order to improve the heating speed, the power of the battery heater is further increased, which leads to high energy loss of the power battery during heating, fast power battery SOC drop in winter, and short vehicle cruising range. In addition, the external heating also has the problem of uneven distribution of the temperature field of the battery (the temperature near the outside and the heat source is high, and the temperature far from the heat source and in the internal part of the power battery is low). The internal heating of the battery, the current used for heating not only generates heat on the internal resistance of the battery, but also generates voltage loss on the internal resistance of the battery. As shown in Figure 1 , Figure 1 is a schematic diagram of a principle of internal heating of a battery according to an example embodiment of the present disclosure; Uocv is the open-circuit voltage of the battery, and r is the equivalent internal resistance of the battery. When the current flows from the battery to the outside, it is equivalent to the battery discharging to the outside, and the terminal voltage Uo of the battery is Uocv-i*r=Uocv-Ur. When the current flows from the outside to the battery, it is equivalent to the outside charging the battery, and the terminal voltage Uo of the battery at this time is Uocv+i*r=Uocv+Ur. It can be seen that the terminal voltage of the battery is always jumping between [Uocv-Ur, Uocv+Ur]. According to the current test of the real vehicle, the amplitude can reach [-10%Uocv, +10%Uocv], and with the increase of the self-heating current, the voltage jump gradually intensifies. That is, the current battery heating scheme usually has the problems of low heating efficiency, poor voltage stability, and poor reliability of improving the power supply of the vehicle.

[0068] To solve the above technical solutions, the battery heating device and the vehicle are provided, which include a controller, a power battery, a target winding and a target bridge arm, the power battery includes a first battery module and a second battery module connected in series; a first end of the target winding is connected to a negative electrode of the first battery module and a positive electrode of the second battery module, and a second end of the target winding is connected to a midpoint of the target bridge arm; a first end of the target bridge arm is connected to a positive electrode of the first battery module, and a second end of the target bridge arm is connected to a negative electrode of the second battery module; the controller is connected to the target bridge arm, and the controller is configured to control the target bridge arm to alternately charge and discharge the first battery module and the second battery module to heat the power battery in a parking heating mode. In this way, the first battery module and the second battery module are connected to the same target winding, the first battery module and the second battery module are alternately charged and discharged through the target winding by controlling the target bridge arm, the heating demand of the power battery can be met, the charging is staggered, the stability of the total voltage of the power battery is ensured, and the reliability of the vehicle power supply is improved.

[0069] The technical solutions of the present disclosure will be described in detail below in combination with specific drawings.

[0070] Figure 2 is a circuit diagram of a battery heating device according to an example embodiment of the present disclosure; as shown in the figure, the battery heating device includes a controller 201, a power battery 202, a target winding 203 and a target bridge arm 204, and the power battery 202 is formed by a first battery module 1 and a second battery module 2 connected in series. Figure 2

[0071] A first end of the target winding 203 is connected to a negative electrode of the first battery module 1 and a positive electrode of the second battery module 2, and a second end of the target winding 203 is connected to a midpoint of the target bridge arm.

[0072] A first end of the target bridge arm 204 is connected to a positive electrode of the first battery module 1, and a second end of the target bridge arm 204 is connected to a negative electrode of the second battery module 2.

[0073] The controller 201 is connected to the target bridge arm 204, and the controller is configured to control the target bridge arm 204 to alternately charge and discharge the first battery module 1 and the second battery module 2 to heat the power battery in a parking heating mode.

[0074] The heating device further includes a load, a first end of the load is connected to a first end of the target bridge arm, and a second end of the load is connected to a second end of the target bridge arm.

[0075] ​The controller 201 is configured to:

[0076] In the balanced heating power supply mode, the target bridge arm 204 is controlled so that the first battery module 1 and the second battery module 2 jointly supply power to the load, and achieve balance between the first battery module and the second battery module.

[0077] It should be noted that the controller is connected to the control terminal of the target bridge arm 204. The target winding 203 can be a single-phase winding or a multi-phase winding, such as a three-phase winding or a six-phase winding. Each phase winding can be an inductor, a motor winding in a multiplexing device, or other components with energy storage characteristics. Both the first battery module 1 and the second battery module 2 can be components formed by multiple cells connected in series or in parallel. The number of cells connected in series or in parallel can be equal or unequal. The bridge arms included in the target bridge arm 204 correspond one-to-one with the windings in the target winding. The target winding 203 includes a multi-phase winding, the target bridge arm 204 includes multiple bridge arms, the midpoint of the target bridge arm 204 is formed by the midpoint terminal of each bridge arm, the first end of the target winding 204 includes the first end of each phase winding, the second end of each phase winding is connected to the midpoint terminal of a bridge arm respectively, each bridge arm includes an upper bridge arm and a lower bridge arm, the upper bridge arm includes an upper bridge switch tube, and the lower bridge arm may include a lower bridge switch tube; the controller 201 can be used to control the upper bridge switch tube of at least one of the multiple bridge arms to be turned on, so as to realize the upper bridge arm is turned on and the upper bridge switch tube is turned off, so as to realize the upper bridge arm is turned off.

[0078] Additionally, the upper and lower bridge switching transistors can be IGBTs (Insulated Gate Bipolar Transistors), MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors), or other thyristors, to provide a path for the heating current. Optionally, a load (e.g., Figure 3 The motor control unit 1 and motor control unit 2 shown in the figure are connected to the positive and negative terminals of the power battery. The controller 201 is used to control the target bridge arm to close when the vehicle is in non-heating mode, and to control the first battery module and the second battery module to jointly supply power to the load.

[0079] The above technical scheme can make the first battery module 1 and the second battery module 2 be connected with the same winding, control the target bridge arm 204, and make the first battery module and the second battery module be alternately charged and discharged through the target winding. The heating demand of the power battery can be met, the power battery can be staggered charged, the stability of the total voltage of the power battery is ensured, and the reliability of vehicle power supply is improved.

[0080] Optionally, the controller 201 is configured to, in a case where it is determined that the heating mode is the voltage equalization heating mode, control the first battery module 1 and the second battery module 2 to be commonly discharged, and obtain a first voltage of the first battery module 1 and a second voltage of the second battery module 2. If the first voltage is less than the second voltage, the upper bridge switch tube and the lower bridge switch tube of at least one bridge arm of the plurality of bridge arms are controlled to be alternately turned on, and the lower bridge switch tube is turned on first, so that the second battery module charges the first battery module through the target winding.

[0081] It should be noted that, in a case where the voltage difference between the first battery module 1 and the second battery module 2 is greater than or equal to a preset voltage threshold, the voltage equalization heating mode can be entered automatically or by prompting a user to trigger a voltage equalization heating mode instruction. For example, the current heating mode of the vehicle can be determined as the voltage equalization heating mode in response to receiving the target instruction triggered by the user through a specified button.

[0082] In a case where the first voltage is less than the second voltage, the lower bridge switch tube of at least one bridge arm of the plurality of bridge arms is controlled to be turned on first, and the upper bridge switch tube is controlled to be turned off. After a preset time period, the lower bridge switch tube is controlled to be turned off, and the upper bridge switch tube is controlled to be turned on. The process is alternately repeated, so that the second battery module stores electricity in the target winding when the lower bridge switch tube of at least one bridge arm is turned on and the upper bridge switch tube is turned off, and the second battery module is discharged from the target winding and charges the first battery module when the lower bridge switch tube is turned off and the upper bridge switch tube is turned on.

[0083] Optionally, when the first voltage of the first battery module is greater than the second voltage of the second battery module, the controller 201 is configured to: in a first time period of the equalization heating power supply mode, control the upper bridge arm of the target bridge arm to be turned on and the lower bridge arm to be turned off, and the first battery module and the second battery module commonly supply power to the load, and the target winding stores energy; and in a second time period of the equalization heating power supply mode, control the lower bridge arm of the target bridge arm to be turned on and the upper bridge arm to be turned off, and the first battery module and the second battery module commonly supply power to the load, and the target winding releases the energy stored to charge the second battery module.

[0084] Optionally, when the first voltage of the first battery module is less than the second voltage of the second battery module, the controller is configured to: in a first time period of the equalization heating power supply mode, control the lower bridge arm of the target bridge arm to be turned on and the upper bridge arm to be turned off, the first battery module and the second battery module jointly supply power to the load, and the target winding stores energy; in a second time period of the equalization heating power supply mode, control the upper bridge arm of the target bridge arm to be turned on and the lower bridge arm to be turned off, the first battery module and the second battery module jointly supply power to the load, and the target winding releases the energy stored in the target winding to charge the first battery module.

[0085] For example, the target winding 203 is a single-phase winding, and the target bridge arm is a single bridge arm. The power battery is also connected with motor electronic control 1 and motor electronic control 2. The motor electronic control refers to a motor controller and a motor.

[0086] Figure 3 is a schematic diagram of current flow in a power battery heating process according to an example embodiment of the present disclosure, as shown in Figure 3 In the case where the first voltage is greater than the second voltage, the upper bridge switch tube 4 of the bridge arm is turned on, the lower bridge switch tube 5 is turned off, and the winding 3 stores electricity. During the electricity storage process, the current direction on the winding 3 is as shown by the internal arrow in Figure 3 After a preset time, the upper bridge switch tube 4 of the bridge arm is turned off, the lower bridge switch tube 5 is turned on, and the winding 3 discharges, thereby charging the second battery module 2, as shown in Figure 4 Figure 4 is a schematic diagram of current flow in a winding discharging process according to an example embodiment of the present disclosure, as shown in Figure 3 During the winding discharging process, the current direction on the winding 3 is as shown by the internal arrow in Figure 4 .

[0087] The first voltage of the first battery module 1 is less than the second voltage of the second battery module 2. The lower bridge switch tube 5 of the bridge arm is turned on, the upper bridge switch tube 4 is turned off, and the winding 3 stores electricity. During the electricity storage process, the current direction on the winding 3 is as shown by the internal arrow in Figure 5 Figure 5 is a schematic diagram of current flow in a winding discharging process according to an example embodiment of the present disclosure, as shown in Figure 6 After a preset time, the lower bridge switch tube 5 of the bridge arm is turned off, the upper bridge switch tube 4 is turned on, and the winding 3 discharges, thereby charging the first battery module 1, as shown in Figure 6 Figure 5 ​​​The embodiment shown shows a schematic diagram of the current flow direction of a winding discharge process, wherein the current direction on the winding 3 is Figure 6 in the direction of the internal arrow.

[0088] The above technical solutions realize the process of charging the second battery module 2 by the first battery module 1 through the alternating circulation of Figure 3 and Figure 4 The above technical solutions realize the process of charging the second battery module 2 by the first battery module 1 through the alternating circulation of Figure 5 and Figure 6 The above technical solutions realize the process of charging the second battery module 2 by the first battery module 1 through the alternating circulation of

[0089] Optionally, the controller 201 is configured to: in the first half cycle in the parking heating mode, control the target bridge arm to cause the first battery module to discharge to charge the second battery module; in the second half cycle in the parking heating mode, control the target bridge arm to cause the second battery module to discharge to charge the first battery module; and the first half cycle and the second half cycle are alternately executed.

[0090] Optionally, the controller 201 is configured to:

[0091] in the first time period of the first half cycle in the parking heating mode, control the upper bridge arm of the target bridge arm to be turned on and the lower bridge arm to be turned off, the first battery module discharges, and the target winding stores energy;

[0092] in the second time period of the first half cycle in the parking heating mode, control the lower bridge arm of the target bridge arm to be turned on and the upper bridge arm to be turned off, the target winding releases the stored energy to charge the second battery module.

[0093] Optionally, the controller is configured to:

[0094] in the first time period of the second half cycle in the parking heating mode, control the lower bridge arm of the target bridge arm to be turned on and the upper bridge arm to be turned off, the second battery module discharges, and the target winding stores energy;

[0095] in the second time period of the second half cycle in the parking heating mode, control the upper bridge arm of the target bridge arm to be turned on and the lower bridge arm to be turned off, the target winding releases the stored energy to charge the first battery module.

[0096] The first half-cycle and the second half-cycle together form the cycle in which the first battery module and the second battery module alternately discharge, and the first time period and the second time period together form the cycle in which the upper bridge switch and the lower bridge switch alternately conduct.

[0097] It should be noted that in this parking heating mode, the load connected to the power battery does not work, that is, the power battery simply heats itself. The frequency of the alternating discharge of the first battery module 1 and the second battery module 2 is less than the frequency of the alternating conduction of the upper bridge switch and the lower bridge switch. The higher the frequency of the alternating conduction of the upper bridge switch and the lower bridge switch, the smaller the voltage fluctuation at both ends of the power battery, and the higher the reliability of the vehicle power supply.

[0098] In this parking heating mode, the upper bridge switch 4 being connected to the lower bridge switch 5 first means that the upper bridge switch 4 is first turned on while the lower bridge switch 5 is turned off, allowing the first battery module 1 to store electricity in the target winding (e.g., Figure 7 As shown, Figure 7 This is a schematic diagram of the current flow in another winding energy storage process according to an exemplary embodiment of the present disclosure. Figure 7 The direction of the middle arrow indicates the current direction when winding 3 stores electricity. After a specified time, the upper bridge switch is turned off and the lower bridge switch is turned on, causing the target winding to charge the second battery module 2 (e.g., ...). Figure 8 As shown, Figure 8 It is based on Figure 7 The illustrated embodiment shows a schematic diagram of the current flow direction during a winding discharge process. Figure 8 The direction of the middle arrow indicates the direction of the discharge current in winding 3. The lower bridge switch 5 being turned on first means that the lower bridge switch 5 is turned on first, while the upper bridge switch 4 is turned off, allowing the second battery module 2 to store electricity in the target winding (e.g., ...). Figure 9 As shown, Figure 9 This is a schematic diagram of the current flow direction in another winding energy storage process according to an exemplary embodiment of this disclosure. Figure 9 The direction of the middle arrow indicates the current direction when winding 3 stores electricity. After a specified time, the lower bridge switch 5 is turned off, and the upper bridge switch 4 is turned on, so that the target winding charges the first battery module 1 (e.g., ...). Figure 10 As shown, Figure 10 It is based on Figure 9 The illustrated embodiment shows a schematic diagram of the current flow direction during a winding discharge process. Figure 10 The direction of the middle arrow indicates the direction of the discharge current in winding 3.

[0099] Optionally, the battery heating assembly further includes a bus capacitor, a first end of which is connected to a first end of the target bridge arm, and a second end of which is connected to a second end of the target bridge arm; the load includes at least one driving load.

[0100] The controller 201 is configured to:

[0101] In the first half cycle of the driving and heating mode, the target bridge arm is controlled so that the first battery module discharges, the first battery module or the bus capacitor supplies power to the driving load to drive the vehicle, and charges the second battery module;

[0102] In the second half cycle of the driving and heating mode, the target bridge arm is controlled so that the second battery module discharges, the second battery module or the bus capacitor supplies power to the driving load to drive the vehicle, and charges the first battery module.

[0103] Optionally, the controller 201 is configured to:

[0104] In the first time period of the second half cycle of the driving and heating mode, the lower bridge arm of the target bridge arm is turned on and the upper bridge arm is turned off, the second battery module discharges, the target winding stores energy, and the bus capacitor supplies power to the driving load;

[0105] In the second time period of the second half cycle of the driving and heating mode, the upper bridge arm of the target bridge arm is turned on and the lower bridge arm is turned off, the second battery module discharges to charge the bus capacitor and supply power to the driving load, and the target winding releases the stored energy to the first battery module to charge the first battery module.

[0106] In the driving and heating mode, the first battery module 1 and the second battery module 2 alternately discharge to supply power to the load (such as motor control 1 and motor control 2), and at the same time, self-heating of the first battery module 1 and the second battery module 2 is completed.

[0107] For example, Figure 11 is a schematic diagram of current flow in another winding energy storage process according to an example embodiment of the present disclosure. In the driving and heating mode, when the first battery module 1 discharges, the upper bridge switch tube 4 is turned on and the lower bridge switch tube 5 is turned off, so that the first battery module 1 stores energy in the target winding (as shown in Figure 11 , the arrow direction in Figure 11 is the current direction when the winding 3 stores energy), and at the same time, the energy pre-charged in the capacitor 6 maintains the power consumption of the load (motor control 1 and motor control 2); and after a specified time, the upper bridge switch tube is turned off and the lower bridge switch tube is turned on, so that the target winding charges the second battery module 2 (as shown in Figure 12 , the arrow direction in Figure 12 is the current direction when the winding 3 discharges). Figure 11 is a schematic diagram of current flow in a winding discharge process according to the embodiment shown in Figure 12The direction of the arrow inside indicates the direction of the discharge current in winding 3. Simultaneously, the first battery module 1 and winding 3 are connected in series to charge capacitor 6, and simultaneously supply power to the loads (motor controller 1 and motor controller 2). This is achieved through... Figure 11 and Figure 12 The alternating cycle shown completes two processes: firstly, it boosts the voltage of the load supplied by the first battery module 1; secondly, it charges the second battery module 2. Figure 11 and Figure 12 During both processes, the first battery module 1 was constantly discharging, while the second battery module 2 was constantly being charged.

[0108] After the target duration (where the target duration is the duration of the first half-cycle, and the period after the target duration is within the second half-cycle), the second battery module can be controlled to discharge, the first battery module stops discharging, and the lower bridge switch 5 is turned on first, while the upper bridge switch 4 is turned off, allowing the second battery module 2 to store energy in the target winding (e.g., Figure 13 As shown, Figure 13 This is a schematic diagram of the current flow direction in another winding energy storage process according to an exemplary embodiment of this disclosure. Figure 13 The direction of the middle arrow indicates the current direction when winding 3 stores electricity. Simultaneously, the pre-charged energy of capacitor 6 maintains the power supply to the load (motor control 1 and motor control 2). Then, after a specified time period (the specified time period is the first time segment, after which the second time segment begins), the lower bridge switch 5 is turned off, and the upper bridge switch 4 is turned on, causing the target winding to charge the first battery module 1 (e.g., ...). Figure 14 As shown, Figure 14 It is based on Figure 13 The illustrated embodiment shows a schematic diagram of the current flow direction during a winding discharge process. Figure 14 The direction of the arrow inside indicates the direction of the discharge current in winding 3. Figure 13 and Figure 14 The alternating cycle shown serves two purposes: firstly, it boosts the voltage of the load supplied by the second battery module 2; secondly, it charges the first battery module 1. Figure 13 and Figure 14 During both processes, the second battery module 2 was constantly discharging, while the first battery module 1 was constantly being charged.

[0109] Optionally, the bridge arm of the motor controller can be reused as the target bridge arm, and the coil of the motor can be reused as the target winding.

[0110] Optionally, the battery heating device further includes a first target switch, the first end of which is connected to the negative terminal of the first battery module and the positive terminal of the second battery module, and the second end of which is connected to the N line led out from the motor.

[0111] The controller 201 is configured to control the first target switch to be turned off to drive in the driving mode when receiving the driving instruction.

[0112] The controller 201 is configured to control the first target switch to be turned on to enter the corresponding mode when receiving the parking heating request instruction, the driving heating request instruction, or the voltage equalization heating request instruction.

[0113] For example, Figure 15 According to Figure 2 A circuit diagram of a battery heating device is shown in the embodiment, in which Figure 15 The target winding includes a three-phase winding, and a first end of the target winding is connected to the negative electrode of the first battery module and the positive electrode of the second battery module through the first target switch.

[0114] The controller 201 is configured to control the first target switch K1 to be closed when determining that the vehicle is in the driving heating mode, the parking heating mode, or the voltage equalization heating mode, and to control the first target switch K1 to be opened when determining that the vehicle is in the four-wheel drive mode, and to supply power to the three-phase winding through the target bridge arm to provide driving force to the vehicle.

[0115] It should be noted that when the vehicle is in the driving heating mode, the first target switch K1 is turned on, and the target bridge arm is controlled according to the control mode shown in Figure 11 to Figure 12 to achieve the voltage boosting of the first battery module 1 to the load and the charging of the first battery module 1 to the second battery module 2; and the target bridge arm is controlled according to the control mode shown in Figure 13 to Figure 14 to achieve the voltage boosting of the second battery module 2 to the load and the charging of the second battery module 1 to the first battery module 2, so that the motor in the vehicle is driven in the way of interleaved voltage boosting driving to control the vehicle driving while self-heating is completed. When the vehicle is in the parking heating mode, the first target switch K1 is turned on, and the target bridge arm is controlled according to the control mode shown in Figure 7 to Figure 10 to make the first battery module and the second battery module charge each other through the target winding to achieve the heating of the power battery. When the vehicle is in the voltage equalization heating mode, the first target switch K1 is turned on, and the target bridge arm is controlled according to the control mode shown in Figure 3 to Figure 6 to make the first battery module and the second battery module supply power to the load together, and make the first battery module and the second battery module charge each other through the target winding to achieve the heating of the power battery.

[0116] Optionally, the battery heating device further includes a second target switch, a first end of the second target switch is connected to the negative electrode of the first battery module and the positive electrode of the second battery module, and a second end of the second target switch is connected to an N line led out by the motor.

[0117] a third target switch, a first end of the third target switch being connected with the N line led out by the motor, and a second end of the third target switch being connected with the motor of the electric drive system;

[0118] The controller 201 is configured to: in the multi-electric drive cooperative driving mode, control the second target switch to be turned off, and control the third target switch to be turned on or turned off, so as to realize the multi-electric drive cooperative driving.

[0119] When receiving the parking heating request instruction, the driving heating request instruction, or the voltage balance heating power supply request instruction, the second target switch is controlled to be turned on, and the third target switch is controlled to be turned off, so as to enter the corresponding mode.

[0120] It should be noted that, in the multi-electric drive cooperative driving mode, when the second target switch is controlled to be turned off and the third target switch is controlled to be turned on, a six-phase motor can be formed, so as to realize the cooperative driving of the six-phase motor and the three-phase motor. In the multi-electric drive cooperative driving mode, when the second target switch is controlled to be turned off and the third target switch is controlled to be turned off, the cooperative driving of the three three-phase motors can be realized.

[0121] For example, Figure 16 According to Figure 2 FIG. 3 is a circuit diagram of another battery heating device according to an embodiment of the present disclosure, and FIG. 4 is a circuit diagram of another battery heating device according to another embodiment of the present disclosure. Figure 16 In the embodiment shown in FIG. 3, the target winding includes a first set of winding coils and a second set of winding coils. The first set of winding coils includes three coils. The first ends of the coils in the first set of winding coils are connected with the first end of the second target switch K2 and the first end of the third target switch K3. The second end of the coil in the first set of winding coils and the second end of the coil in the second set of winding coils are respectively connected with the midpoint connection end of the bridge arm.

[0122] In the case where it is determined that the vehicle is in the driving heating mode, the parking heating mode, or the voltage balance heating mode, after the second target switch K2 is controlled to be turned on and the third target switch K3 is controlled to be turned off, the control of the target bridge arm can refer to the related description in the above Figure 3 to Figure 14 In the case where it is determined that the vehicle is in the full-power driving mode, the control of the target bridge arm can refer to the control mode of the full-bridge circuit to the motor in the prior art, which is relatively mature in the prior art, and the present disclosure does not limit this.

[0123] The above technical solutions realize flexible control of the use of the motor winding in the vehicle by multiplexing the motor winding, which can reduce the cost of battery heating of the vehicle while improving the flexibility and reliability of the driving process of the vehicle.

[0124] In another exemplary embodiment of the present disclosure, a vehicle is provided, which includes the aboveFigure 2 to Figure 16 The battery heating device according to any one of the preceding items.

[0125] The preferred embodiments of the present disclosure are described in detail above with reference to the drawings, but the present disclosure is not limited to the specific details of the above-described embodiments. Various simple modifications can be made to the technical solutions of the present disclosure within the technical concept of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

[0126] In addition, it should be noted that each specific technical feature described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, various possible combinations are not described again in the present disclosure.

[0127] Furthermore, various different embodiments of the present disclosure can also be combined in any manner, as long as they do not deviate from the idea of the present disclosure, and they should also be considered as disclosed by the present disclosure.

Claims

1. A battery heating device, characterized by, The battery heating device comprises a controller, a power battery, a target winding and a target bridge arm, the power battery comprises a first battery module and a second battery module connected in series; a first end of the target winding is connected to a negative electrode of the first battery module and a positive electrode of the second battery module, and a second end of the target winding is connected to a midpoint of the target bridge arm; a first end of the target bridge arm is connected to a positive electrode of the first battery module, and a second end of the target bridge arm is connected to a negative electrode of the second battery module; the controller is connected to the target bridge arm, and the controller is configured to control the target bridge arm to alternately charge and discharge the first battery module and the second battery module to heat the power battery in a parking heating mode; the heating mode of the power battery comprises the parking heating mode, a driving heating mode or a voltage balance heating mode; wherein the target bridge arm comprises an upper bridge arm and a lower bridge arm, and a frequency at which the first battery module and the second battery module are alternately discharged is less than a frequency at which the upper bridge arm and the lower bridge arm are alternately turned on; the battery heating device further comprises a load and a bus capacitor; a first end of the load is connected to a first end of the target bridge arm, and a second end of the load is connected to a second end of the target bridge arm; a first end of the bus capacitor is connected to the first end of the target bridge arm, and a second end of the bus capacitor is connected to the second end of the target bridge arm.

2. The battery heating device according to claim 1, wherein the controller is configured to: control the target bridge arm to supply power to the load by the first battery module and the second battery module together and to balance the first battery module and the second battery module in a balance heating power supply mode.

3. The battery heating apparatus of claim 2, wherein, when a first voltage of the first battery module is greater than a second voltage of the second battery module, the controller is configured to: control the upper bridge arm of the target bridge arm to be turned on and the lower bridge arm to be turned off in a first time period of the balance heating power supply mode, the first battery module and the second battery module supply power to the load together, and the target winding stores energy; control the lower bridge arm of the target bridge arm to be turned on and the upper bridge arm to be turned off in a second time period of the balance heating power supply mode, the first battery module and the second battery module supply power to the load together, and the target winding releases the energy stored to charge the second battery module.

4. The battery heating apparatus of claim 2, wherein, when the first voltage of the first battery module is less than the second voltage of the second battery module, the controller is configured to: control the lower bridge arm of the target bridge arm to be turned on and the upper bridge arm to be turned off in a first time period of the balance heating power supply mode, the first battery module and the second battery module supply power to the load together, and the target winding stores energy; control the upper bridge arm of the target bridge arm to be turned on and the lower bridge arm to be turned off in a second time period of the balance heating power supply mode, the first battery module and the second battery module supply power to the load together, and the target winding releases the energy stored to charge the first battery module.

5. The battery heating apparatus of claim 1, wherein, the controller is configured to: in a first half cycle of the park heating mode, the target bridge arm is controlled so that the first battery module discharges and the second battery module charges; in a second half cycle of the park heating mode, the target bridge arm is controlled so that the second battery module discharges and the first battery module charges; the first half cycle and the second half cycle are alternately executed.

6. The battery heating apparatus of claim 5, wherein, the controller is configured to: in a first time period of the first half cycle of the park heating mode, the upper bridge arm of the target bridge arm is turned on and the lower bridge arm is turned off, the first battery module discharges, and the target winding stores energy; in a second time period of the first half cycle of the park heating mode, the lower bridge arm of the target bridge arm is turned on and the upper bridge arm is turned off, the target winding releases the stored energy to charge the second battery module.

7. The battery heating device according to claim 5, wherein the controller is configured to: in a first time period of the second half cycle of the park heating mode, the lower bridge arm of the target bridge arm is turned on and the upper bridge arm is turned off, the second battery module discharges, and the target winding stores energy; in a second time period of the second half cycle of the park heating mode, the upper bridge arm of the target bridge arm is turned on and the lower bridge arm is turned off, the target winding releases the stored energy to charge the first battery module.

8. The battery heating apparatus of claim 1, wherein, the load includes at least one driving load; the controller is configured to: in a first half cycle of the drive heating mode, the target bridge arm is controlled so that the first battery module discharges, the first battery module or the bus capacitor supplies power to the driving load to drive the vehicle, and the second battery module charges; in a second half cycle of the drive heating mode, the target bridge arm is controlled so that the second battery module discharges, the second battery module or the bus capacitor supplies power to the driving load to drive the vehicle, and the first battery module charges.

9. The battery heating apparatus of claim 8, wherein, the controller is configured to: in a first time period of the first half cycle of the drive heating mode, the upper bridge arm of the target bridge arm is turned on and the lower bridge arm is turned off, the first battery module discharges, the target winding stores energy, and the bus capacitor supplies power to the driving load; in a second time period of the first half cycle of the drive heating mode, the lower bridge arm of the target bridge arm is turned on and the upper bridge arm is turned off, the first battery module discharges to charge the bus capacitor and supply power to the driving load, the target winding releases the stored energy to the second battery module to charge the second battery module.

10. The battery heating apparatus of claim 8, wherein, the controller is configured to: in a first time period of the second half cycle of the drive heating mode, the lower bridge arm of the target bridge arm is turned on and the upper bridge arm is turned off, the second battery module discharges, the target winding stores energy, and the bus capacitor supplies power to the driving load; In a second time period of the second half cycle of the driving heating mode, the upper bridge arm of the target bridge arm is turned on and the lower bridge arm is turned off, the second battery module is discharged to charge the bus capacitor and power the driving load, and the target winding releases the stored energy to the first battery module to charge the first battery module.

11. The battery heating apparatus of claim 1, wherein, The bridge arm of the motor controller is reused as the target bridge arm, and the coil of the motor is reused as the target winding.

12. The battery heating apparatus of claim 11, wherein, It also includes a first target switch, a first end of the first target switch being connected with a negative electrode of the first battery module and a positive electrode of the second battery module, and a second end of the first target switch being connected with an N line of the motor; The controller is configured to: when receiving a driving instruction, control the first target switch to be turned off to perform a driving mode; When receiving a parking heating request instruction, a driving heating request instruction, or an equalization heating power supply request instruction, control the first target switch to be turned on to enter a corresponding mode.

13. The battery heating apparatus of claim 11, wherein, It also includes: A second target switch, a first end of the second target switch being connected with the negative electrode of the first battery module and the positive electrode of the second battery module, and a second end of the second target switch being connected with the N line of the motor; A third target switch, a first end of the third target switch being connected with the N line of the motor, and a second end of the third target switch being connected with the motor of the electric drive system; The controller is configured to: in a multi-electric drive cooperative driving mode, control the second target switch to be turned off, and the third target switch to be turned on or turned off to realize multi-electric drive cooperative driving; When receiving a parking heating request instruction, a driving heating request instruction, or an equalization heating power supply request instruction, control the second target switch to be turned on and the third target switch to be turned off to enter a corresponding mode.

14. A vehicle characterized by comprising: The battery heating device according to any one of claims 1-13.

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