Battery pulse heating system, vehicle, heating method and computer readable storage medium

Abstract

The invention discloses a battery pulse heating system, a vehicle, a heating method and a computer readable storage medium. The heating system comprises an inverter, a motor, a main diode VD0, a motor controller and a battery management module, and a main switch K0 is arranged between the inverter and the positive electrode of a battery pack E; the positive electrode of the main diode VD0 is connected to the parallel end of the capacitor C of the inverter and the three upper bridge arms, and the negative electrode of the main diode VD0 is connected to the positive electrode of the battery pack E; when the state parameters, collected by the battery management module, of the battery pack E meet preset heating conditions, the battery management module sends a heating instruction to the motor controller; and the motor controller responds to the heating instruction, outputs a driving signal to control a preset target upper bridge arm switch to be switched on, and periodically controls a main switch K0 and a preset target lower bridge arm switch to be synchronously switched on and switched off. The invention has the advantages that the motor bus capacitor C and the stator inductor are simultaneously utilized to store energy, the pulse current passing through the battery pack E is increased, and the heating efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power batteries, and in particular to a battery pulse heating system, a vehicle, a heating method and a computer-readable storage medium. Background Art

[0002] With the development of new energy, more and more fields are using new energy as power. Due to its advantages of high energy density, rechargeable, safe and environmentally friendly, batteries are widely used in new energy vehicles, consumer electronics, energy storage systems and other fields. However, the performance and life of power batteries are attenuated under low temperature conditions, and the use of batteries in low temperature environments will be subject to certain restrictions. Specifically, the discharge capacity of the battery will seriously decline in a low temperature environment, and the battery cannot be charged in a low temperature environment. Therefore, in order to be able to use the battery normally, it is necessary to heat the battery in a low temperature environment. At this stage, the battery can be equipped with a special thermal cycle container, and the heat can be transferred to the battery by indirectly heating the heat conductive material in the thermal cycle container to achieve heating of the battery, such as PTC water heating, Webasto high-voltage electric heating, motor stall heating, motor waste heat heating, fuel heating, etc. for indirect heating. However, this heating method takes a long time and has low heating efficiency. Summary of the invention

[0003] In order to solve at least one of the above technical problems, the present invention provides a battery pulse heating system, a vehicle, a heating method and a computer-readable storage medium. The battery pulse heating system uses the bus capacitance C and stator inductance of the vehicle motor circuit to generate high-frequency pulses to heat the power battery.

[0004] The present invention solves the technical problem by adopting the following technical solution:

[0005] A battery pulse heating system comprises an inverter connected to a battery pack E, a motor connected to the inverter, a main diode VD0, a motor controller and a battery management module, wherein a main switch K0 is provided between the inverter and the positive electrode of the battery pack E;

[0006] The inverter comprises a capacitor C, a first phase bridge arm, a second phase bridge arm and a third phase bridge arm connected in parallel in sequence, the first phase bridge arm comprises a first upper bridge arm and a first lower bridge arm, the second phase bridge arm comprises a second upper bridge arm and a second lower bridge arm, and the third phase bridge arm comprises a third upper bridge arm and a third lower bridge arm;

[0007] The motor includes a first stator inductor L1, a second stator inductor L2 and a third stator inductor L3, an input end of the first stator inductor L1 is connected to a connection point between the first upper bridge arm and the first lower bridge arm, an input end of the second stator inductor L2 is connected to a connection point between the second upper bridge arm and the second lower bridge arm, and an input end of the third stator inductor L3 is connected to a connection point between the third upper bridge arm and the third lower bridge arm;

[0008] The positive electrode of the main diode VD0 is connected to the parallel end of the capacitor C, the first upper bridge arm, the second upper bridge arm and the third upper bridge arm, and the negative electrode of the main diode VD0 is connected to the positive electrode of the battery pack E;

[0009] The battery management module is used to collect the state parameters of the battery pack E. When the state parameters of the battery pack E meet the preset heating conditions, the battery management module sends a heating instruction to the motor controller;

[0010] The motor controller responds to the heating instruction issued by the battery management module, outputs a driving signal to control the preset target upper bridge arm switch to close, and periodically controls the main switch K0 and the preset target lower bridge arm switch to close and open synchronously; the target upper bridge arm and the target lower bridge arm are different phase bridge arms.

[0011] Further, the anode connection point P0 of the main diode VD0 is arranged between the parallel connection point P1 of the first upper bridge arm and the parallel connection point P2 of the second upper bridge arm; or, the anode connection point P0 of the main diode VD0 is arranged at the parallel connection point P2 of the second upper bridge arm.

[0012] Further, the target upper bridge arm is configured as a first upper bridge arm, and the target lower bridge arm is configured as at least one lower bridge arm of a different phase from the target upper bridge arm, and the heating system can be set to multiple control modes.

[0013] Furthermore, the anode connection point P0 of the main diode VD0 is arranged after the parallel connection point P2 of the second upper bridge arm.

[0014] Furthermore, the target upper bridge arm is configured as a first upper bridge arm and / or a second upper bridge arm; the target lower bridge arm is configured as at least one lower bridge arm that is different in phase from the target upper bridge arm, and the parallel connection point of the upper bridge arm connected in series with the target lower bridge arm is located after the parallel connection point of the target upper bridge arm, and the heating system can be set to multiple control modes.

[0015] Furthermore, the motor controller responds to the heating instruction issued by the battery management module, outputs a driving signal, controls the main switch K0, and when the preset target lower bridge arm switch is disconnected, controls the upper bridge arm switch connected in series with the preset target lower bridge arm switch to close, thereby protecting the diode in parallel with the upper bridge arm switch connected in series with the preset target lower bridge arm switch.

[0016] Furthermore, a vehicle comprises the battery pulse heating system as described in any one of the above items.

[0017] Furthermore, a battery pulse heating method is applied to the battery pulse heating system described in any one of the above, and the battery pulse heating control method includes:

[0018] The battery management module collects the temperature T of the battery pack E. When the temperature T of the battery pack E is lower than a preset temperature threshold T0, the battery management module sends a heating instruction to the motor controller;

[0019] The motor controller monitors the motor state. When the motor is in a non-working state, in response to a heating instruction issued by a battery management module, the motor controller outputs a drive signal to control the closing of a preset target upper bridge arm switch, and periodically controls the main switch K0 and the preset target lower bridge arm switch to close and open synchronously; the target upper bridge arm and the target lower bridge arm are different phase bridge arms.

[0020] Furthermore, the method further comprises:

[0021] The battery management module monitors the temperature T of the battery pack E. When the temperature T of the battery pack E is higher than or equal to a preset temperature threshold T0, the battery management module sends a stop instruction to the motor controller; in response to the stop instruction sent by the battery management module, the motor controller stops outputting the drive signal; and / or,

[0022] The motor controller monitors the state of the motor, and when the motor is in a working state, the motor controller stops outputting a driving signal.

[0023] Furthermore, a computer-readable storage medium stores a battery pulse heating program for a vehicle, and when the battery pulse heating program is executed by a processor, the battery pulse heating method described above is implemented.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] (1) The vehicle motor circuit is used to generate high-frequency pulses to heat the internal power battery. This requires little change to the existing circuit and has low cost. In addition, the heating power is large, the temperature rise rate is fast, the temperature is uniform, and the heating efficiency is high.

[0026] (2) When the battery needs to be heated and the motor is in a non-working state, the motor controller outputs a drive signal to control the preset target upper bridge arm switch to close, and periodically controls the main switch K0 and the preset target lower bridge arm switch to close and open synchronously, thereby simultaneously utilizing the motor bus capacitor C and stator inductance to store energy, increasing the pulse current passing through the battery pack E and improving the heating efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to better understand the above and other purposes, features, advantages and functions of the present invention, reference may be made to the embodiments shown in the accompanying drawings. The same reference numerals in the accompanying drawings refer to the same components. It should be understood by those skilled in the art that the accompanying drawings are intended to schematically illustrate the preferred embodiments of the present invention and have no limiting effect on the scope of the present invention, and the components in the drawings are not drawn to scale.

[0028] Figure 1 A schematic diagram of an embodiment of battery discharge of a battery pulse heating system of the present invention.

[0029] Figure 2 A schematic diagram of an embodiment of charging a battery of a battery pulse heating system of the present invention.

[0030] Figure 3 A schematic diagram of another embodiment of battery discharge of the battery pulse heating system of the present invention.

[0031] Figure 4 A schematic diagram of another embodiment of charging a battery of the battery pulse heating system of the present invention.

[0032] Figure 5 The figure is a flow chart of the battery pulse heating method of the present invention. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the exemplary embodiments of the present invention are described below in conjunction with the accompanying drawings, including various details of the embodiments of the present invention to facilitate understanding, which should be considered as merely exemplary. Therefore, it should be recognized by those of ordinary skill in the art that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present disclosure. Similarly, for the sake of clarity and conciseness, the description of well-known functions and structures is omitted in the following description.

[0034] In the description of the present invention, it should be noted that the term "including" and its variations represent open inclusion, that is, "including but not limited to". The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. The term "and / or" when used to list two or more items means that any one of the listed items can be used, or any combination of two or more of the listed items can be used. In addition, in the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0035] The present invention provides a battery pulse heating system, referring to Figure 1-Figure 4As shown, it includes an inverter connected to a battery pack E, a motor connected to the inverter, a main diode VD0, a motor controller and a battery management module, and a main switch K0 is provided between the inverter and the positive electrode of the battery pack E. The inverter includes a capacitor C, a first phase bridge arm, a second phase bridge arm and a third phase bridge arm connected in parallel in sequence, the first phase bridge arm includes a first upper bridge arm and a first lower bridge arm, the second phase bridge arm includes a second upper bridge arm and a second lower bridge arm, and the third phase bridge arm includes a third upper bridge arm and a third lower bridge arm. The motor includes a first stator inductor L1, a second stator inductor L2 and a third stator inductor L3, the input end of the first stator inductor L1 is connected to the connection point of the first upper bridge arm and the first lower bridge arm, the input end of the second stator inductor L2 is connected to the connection point of the second upper bridge arm and the second lower bridge arm, and the input end of the third stator inductor L3 is connected to the connection point of the third upper bridge arm and the third lower bridge arm. The positive electrode of the main diode VD0 is connected to the parallel end of the capacitor C, the first upper bridge arm, the second upper bridge arm and the third upper bridge arm, and the negative electrode of the main diode VD0 is connected to the positive electrode of the battery pack E.

[0036] The battery management module is used to collect the state parameters of the battery pack E. When the state parameters of the battery pack E meet the preset heating conditions, the battery management module issues a heating instruction to the motor controller; the motor controller responds to the heating instruction issued by the battery management module, outputs a drive signal to control the preset target upper bridge arm switch to close, and periodically controls the main switch K0 and the preset target lower bridge arm switch to close and open synchronously; the target upper bridge arm and the target lower bridge arm are different phase bridge arms.

[0037] When the battery management module in the battery heating system determines that the state parameters of the battery pack E meet the preset heating conditions, it sends a heating instruction to the motor controller, controls the motor controller to output a drive signal to the main switch K0, the target upper bridge arm switch and the target lower bridge arm switch to control the preset target upper bridge arm switch to close, and periodically controls the main switch K0 and the preset target lower bridge arm switch to close and open synchronously. The target upper bridge arm switch remains closed, and the main switch K0 and the target lower bridge arm switch are first closed and then opened to form an opening and closing cycle. In multiple opening and closing cycles, an alternating current is generated in the circuit where the battery pack E is located, that is, the battery pack E is alternately charged and discharged. The battery pack E has an internal resistance. In the process of alternating charging and discharging of the battery pack E, the alternating current flows through the internal resistance of the battery pack E to generate heat, that is, the battery pack E generates heat from the inside, thereby performing pulse heating on the battery pack E.

[0038] It should be noted that the switches that have not received the motor controller driving signal (except the main switch K0, the target upper bridge arm switch and the target lower bridge arm switch) are all disconnected.

[0039] For ease of description, the parallel ends of capacitor C, the first upper bridge arm, the second upper bridge arm and the third upper bridge arm are recorded as the first parallel end, and the connection points of capacitor C, the first upper bridge arm, the second upper bridge arm and the third upper bridge arm with the first parallel end are Pc, P1, P2, and P3 respectively, and the connection point between the positive electrode of the main diode VD0 and the first parallel end is P0. The positive electrode connection point P0 of the main diode VD0 is arranged after the parallel connection point P1 of the first upper bridge arm, and the upper bridge arm located before the connection point P0 can be selected as the target upper bridge arm. The connection point P0 is arranged after the parallel connection point P1 of the first upper bridge arm, including that the connection point P0 can be arranged between the connection point P1 and the connection point P2, the connection point P2, between the connection point P2 and the connection point P3, the connection point P3 or after the connection point P3.

[0040] In one embodiment, reference Figure 1 and Figure 2 As shown, the positive connection point P0 of the main diode VD0 is set between the parallel connection point P1 of the first upper bridge arm and the parallel connection point P2 of the second upper bridge arm; or, the positive connection point P0 of the main diode VD0 is set at the parallel connection point P2 of the second upper bridge arm. At this time, the target upper bridge arm can be configured as the first upper bridge arm, and the target lower bridge arm can be configured as at least one lower bridge arm with a different phase from the target upper bridge arm. According to the preset target upper bridge arm and target lower bridge arm, the motor controller has three control modes when controlling the opening and closing of each switch.

[0041] Mode 1: The target upper bridge arm is the first upper bridge arm, and the target lower bridge arm is the second lower bridge arm. When the motor controller receives the heating instruction from the battery management module, it controls the first upper bridge arm switch K1 to close, and periodically controls the main switch K0 and the second lower bridge arm switch K5 to close and open synchronously. Figure 1 As shown, when the first upper bridge arm switch K1, the main switch K0, and the second lower bridge arm switch K5 are closed, the battery pack E discharges, and the current flows from the positive electrode of the battery pack E through the main switch K0, the first upper bridge arm switch K1, the first stator inductor L1, the second stator inductor L2, and the second lower bridge arm switch K5, and then returns to the negative electrode of the battery pack E. At this time, the first stator inductor L1 and the second stator inductor L2 store energy. At the same time, the battery pack E charges the capacitor C, and the capacitor C stores energy. When the first upper bridge arm switch K1 is closed, the main switch K0 and the second lower bridge arm switch K5 are disconnected, refer to Figure 2As shown, the first stator inductor L1, the second stator inductor L2 and the capacitor C are discharged, and the current flows from the positive electrode of the capacitor C through the first upper bridge arm switch K1, the first stator inductor L1, the second stator inductor L2, the second upper bridge arm diode VD2 and the main diode VD0 to the positive electrode of the battery pack E, flows through the battery pack E, and then returns from the negative electrode of the battery pack E to the negative electrode of the capacitor C, forming a loop to charge the battery pack E. In this mode, the first stator inductor L1, the second stator inductor L2 and the capacitor C are all charged and discharged, the charging and discharging efficiency is high, and the heating efficiency of the battery pack E is high.

[0042] Mode 2, the target upper bridge arm is the first upper bridge arm, and the target lower bridge arm is the third lower bridge arm. When the motor controller receives the heating instruction issued by the battery management module, it controls the first upper bridge arm switch K1 to close, and periodically controls the main switch K0 and the third lower bridge arm switch K6 to close and disconnect synchronously. At this time, when the first upper bridge arm switch K1, the main switch K0, and the third lower bridge arm switch K6 are closed, the battery pack E discharges, and the current flows from the positive electrode of the battery pack E through the main switch K0, the first upper bridge arm switch K1, the first stator inductor L1, the third stator inductor L3 and the third lower bridge arm switch K6 and then returns to the negative electrode of the battery pack E. At this time, the first stator inductor L1 and the third stator inductor L3 store energy. At the same time, the battery pack E charges the capacitor C, and the capacitor C stores energy. When the first upper bridge arm switch K1 is closed, the main switch K0 and the third lower bridge arm switch K6 are disconnected, the first stator inductor L1, the third stator inductor L3 and the capacitor C are discharged, and the current flows from the positive electrode of the capacitor C through the first upper bridge arm switch K1, the first stator inductor L1, the third stator inductor L3, the third upper bridge arm diode VD3 and the main diode VD0 to the positive electrode of the battery pack E, flows through the battery pack E, and then returns from the negative electrode of the battery pack E to the negative electrode of the capacitor C, forming a loop to charge the battery pack E. In this mode, the first stator inductor L1, the third stator inductor L3 and the capacitor C are all charged and discharged, the charging and discharging efficiency is high, and the heating efficiency of the battery pack E is high.

[0043] Mode three, the target upper bridge arm is the first upper bridge arm, and the target lower bridge arm is the second lower bridge arm and the third lower bridge arm. When the motor controller receives the heating instruction issued by the battery management module, it controls the first upper bridge arm switch K1 to close, and periodically controls the main switch K0, the second lower bridge arm switch K5 and the third lower bridge arm switch K6 to close and open synchronously. At this time, when the first upper bridge arm switch K1, the main switch K0, the second lower bridge arm switch K5 and the third lower bridge arm switch K6 are closed, the battery pack E discharges, and the current flows from the positive electrode of the battery pack E through the main switch K0, the first upper bridge arm switch K1, and the first stator inductor L1, and then returns to the negative electrode of the battery pack E in two ways, one way flows through the second stator inductor L2 and the second lower bridge arm switch K5 and then returns to the negative electrode of the battery pack E, and the other way flows through the third stator inductor L3 and the third lower bridge arm switch K6 and then returns to the negative electrode of the battery pack E. At this time, the first stator inductor L1, the second stator inductor L2 and the third stator inductor L3 all store energy. At the same time, the battery pack E charges the capacitor C, and the capacitor C stores energy. When the first upper bridge arm switch K1 is closed, the main switch K0, the second lower bridge arm switch K5, and the third lower bridge arm switch K6 are disconnected, the first stator inductor L1, the second stator inductor L2, the third stator inductor L3, and the capacitor C are discharged, and the current flows from the positive electrode of the capacitor C through the first upper bridge arm switch K1 and the first stator inductor L1, and then flows through the second stator inductor L2 and the second upper bridge arm diode VD2, and the third stator inductor L3 and the third upper bridge arm diode VD3 respectively, and then converges to flow through the main diode VD0 to the positive electrode of the battery pack E, flows through the battery pack E, and then returns from the negative electrode of the battery pack E to the negative electrode of the capacitor C, forming a loop to charge the battery pack E. In this mode, the first stator inductor L1, the second stator inductor L2, the third stator inductor L3, and the capacitor C are all charged and discharged, the charging and discharging efficiency is high, and the heating efficiency of the battery pack E is high.

[0044] It should be noted that the target upper bridge arm and the target lower bridge arm of each opening and closing cycle during the entire heating period may be the same or different. For example, the target upper bridge arm of each opening and closing cycle during the entire heating period is the first upper bridge arm, and the target lower bridge arm is the second lower bridge arm. Alternatively, the target upper bridge arm of each opening and closing cycle in a heating time period is the first upper bridge arm, and the target lower bridge arm is the second lower bridge arm, and the target upper bridge arm of each opening and closing cycle in another heating time period is the first upper bridge arm, and the target lower bridge arm is the third lower bridge arm. The target upper bridge arm and the target lower bridge arm of each opening and closing cycle can be flexibly set as needed.

[0045] In one embodiment, the positive connection point P0 of the main diode VD0 is arranged after the parallel connection point P2 of the second upper bridge arm, including that the connection point P0 can be arranged between the connection point P2 and the connection point P3, the connection point P3 or after the connection point P3. At this time, the target upper bridge arm can be configured as the first upper bridge arm and / or the second upper bridge arm; the target lower bridge arm can be configured as at least one lower bridge arm of different phase from the target upper bridge arm, and the parallel connection point of the upper bridge arm connected in series with the target lower bridge arm is located after the parallel connection point of the target upper bridge arm. According to the preset target upper bridge arm and target lower bridge arm, the motor controller has five control modes when controlling the opening and closing of each switch.

[0046] Mode 1: the target upper bridge arm is the first upper bridge arm, and the target lower bridge arm is the second lower bridge arm.

[0047] Mode 2: the target upper bridge arm is the first upper bridge arm, and the target lower bridge arm is the third lower bridge arm.

[0048] Mode three, the target upper bridge arm is the first upper bridge arm, and the target lower bridge arms are the second lower bridge arm and the third lower bridge arm.

[0049] The actions and current directions of the corresponding switches in Mode 1, Mode 2 and Mode 3 are the same as those when the positive connection point P0 of the main diode VD0 is set between the parallel connection point P1 of the first upper bridge arm and the parallel connection point P2 of the second upper bridge arm or at the parallel connection point P2 of the second upper bridge arm, and are not described one by one here.

[0050] Mode 4: the target upper bridge arm is the second upper bridge arm, and the target lower bridge arm is the third lower bridge arm. When the motor controller receives the heating instruction from the battery management module, it controls the second upper bridge arm switch K2 to close, and periodically controls the main switch K0 and the third lower bridge arm switch K6 to close and open synchronously. Figure 3 As shown, when the second upper bridge arm switch K2, the main switch K0, and the third lower bridge arm switch K6 are closed, the battery pack E discharges, and the current flows from the positive electrode of the battery pack E through the main switch K0, the second upper bridge arm switch K2, the second stator inductor L2, the third stator inductor L3, and the third lower bridge arm switch K6 and then returns to the negative electrode of the battery pack E. At this time, the second stator inductor L2 and the third stator inductor L3 store energy. At the same time, the battery pack E charges the capacitor C, and the capacitor C stores energy. Figure 4 As shown, when the second upper bridge arm switch K2 is closed, the main switch K0 and the third lower bridge arm switch K6 are disconnected, the second stator inductor L2, the third stator inductor L3 and the capacitor C are discharged, and the current flows from the positive electrode of the capacitor C through the second upper bridge arm switch K2, the second stator inductor L2, the third stator inductor L3, the third upper bridge arm diode VD3 and the main diode VD0 to the positive electrode of the battery pack E, flows through the battery pack E, and then returns from the negative electrode of the battery pack E to the negative electrode of the capacitor C, forming a loop to charge the battery pack E.

[0051] Mode five, the target upper bridge arm is the first upper bridge arm and the second upper bridge arm, and the target lower bridge arm is the third lower bridge arm. When the motor controller receives the heating instruction issued by the battery management module, it controls the first upper bridge arm switch K1 and the second upper bridge arm switch K2 to close, and periodically controls the main switch K0 and the third lower bridge arm switch K6 to close and disconnect synchronously. At this time, when the first upper bridge arm switch K1, the second upper bridge arm switch K2, the main switch K0, and the third lower bridge arm switch K6 are closed, the battery pack E discharges, and the current flows from the positive electrode of the battery pack E through the main switch K0, and then flows through the first upper bridge arm switch K1 and the second upper bridge arm switch K2 through the first stator inductor L1 and the second stator inductor L2 respectively, and then flows through the third stator inductor L3 and the third lower bridge arm switch K6 after converging, and then returns to the negative electrode of the battery pack E. At this time, the first stator inductor L1, the second stator inductor L2, and the third stator inductor L3 all store energy. At the same time, the battery pack E charges the capacitor C, and the capacitor C stores energy. When the first upper bridge arm switch K1 and the second upper bridge arm switch K2 are closed, and the main switch K0 and the third lower bridge arm switch K6 are opened, the first stator inductor L1, the second stator inductor L2, the third stator inductor L3 and the capacitor C are discharged, and the current flows from the positive electrode of the capacitor C through the first upper bridge arm switch K1 and the second upper bridge arm switch K2 respectively, and then flows through the third stator inductor L3, the third upper bridge arm diode VD3 and the main diode VD0 to the positive electrode of the battery pack E, flows through the battery pack E, and then returns from the negative electrode of the battery pack E to the negative electrode of the capacitor C, forming a loop to charge the battery pack E. In this mode, the first stator inductor L1, the second stator inductor L2, the third stator inductor L3 and the capacitor C are all charged and discharged, and the charging and discharging efficiency is high. Moreover, only the main switch K0 and the third lower bridge arm switch K6 are periodically closed and opened, and the bridge arm switches that are periodically opened and closed are few, which prolongs the service life of the bridge arm switches, thereby prolonging the service life of the heating system.

[0052] Preferably, the motor controller responds to the heating instruction issued by the battery management module, outputs a driving signal, controls the main switch K0, and when the preset target lower bridge arm switch is disconnected, controls the upper bridge arm switch connected in series with the preset target lower bridge arm switch to be closed, so that the current flows through the upper bridge arm switch connected in series with the preset target lower bridge arm switch, protects the diode connected in parallel with the upper bridge arm switch connected in series with the preset target lower bridge arm switch, and prolongs the service life of the diode. For example, the target upper bridge arm is the first upper bridge arm, the target lower bridge arm is the second lower bridge arm, the first upper bridge arm switch K1 is closed, the main switch K0 and the second lower bridge arm switch K5 are disconnected, and the second upper bridge arm switch K2 is closed. At this time, when the first stator inductor L1, the second stator inductor L2 and the capacitor C are discharged, the current flows from the positive electrode of the capacitor C through the first upper bridge arm switch K1, the first stator inductor L1, the second stator inductor L2, the second upper bridge arm switch K2 and the main diode VD0 to the positive electrode of the battery pack E, flows through the battery pack E, and then returns from the negative electrode of the battery pack E to the negative electrode of the capacitor C, forming a loop to charge the battery pack E. The current flows through the second upper bridge arm switch K2 and does not flow through the second upper bridge arm diode VD2, which can protect the diode and extend the service life of the diode.

[0053] The present invention also provides a vehicle, comprising the battery pulse heating system described in any one of the above items.

[0054] The present invention also provides a battery pulse heating method, which is applied to any of the battery pulse heating systems described above, referring to Figure 5 As shown, the battery pulse heating control method includes:

[0055] The battery management module collects the temperature T of the battery pack E. When the temperature T of the battery pack E is lower than a preset temperature threshold T0, the battery management module sends a heating instruction to the motor controller;

[0056] The motor controller monitors the motor state. When the motor is in a non-working state, in response to a heating instruction issued by a battery management module, the motor controller outputs a drive signal to control the closing of a preset target upper bridge arm switch, and periodically controls the main switch K0 and the preset target lower bridge arm switch to close and open synchronously; the target upper bridge arm and the target lower bridge arm are different phase bridge arms.

[0057] The battery management module is used to collect the state parameters of the battery pack E, including the temperature T of the battery pack E. When the state parameters of the battery pack E meet the preset heating conditions, a heating instruction is sent to the motor controller to control the motor controller to output a drive signal. The battery management module is preset with a temperature threshold T0. When the temperature T of the battery pack E is lower than the preset temperature threshold T0, the battery pack E cannot work normally and needs to be heated. The preset temperature threshold T0 can be set according to the working scene and working requirements of the vehicle, and is not limited here.

[0058] During the operation of the electric vehicle, the motor is in a working state, and the switches in each bridge arm in the inverter cannot be controlled. Therefore, when heating the battery pack E, it is necessary to determine that the motor is in a non-working state, that is, the electric vehicle is in a stationary state. The motor controller can establish communication with the vehicle controller, and determine whether the vehicle is stationary through the vehicle controller. When the motor is in a non-working state, and the battery management module determines that the temperature T of the battery pack E is lower than the preset temperature threshold T0, when the battery management module sends a heating instruction to the motor controller, the motor controller will output a drive signal only after receiving the heating instruction to control the preset target upper bridge arm switch to close, and periodically control the main switch K0 and the target lower bridge arm switch that is different from the preset target upper bridge arm to close and disconnect synchronously, so as to heat the battery pack E.

[0059] When the battery pack E stops heating, automatic control can be performed according to the temperature T of the battery pack E and / or the state of the motor.

[0060] The method further comprises:

[0061] The battery management module monitors the temperature T of the battery pack E. When the temperature T of the battery pack E is higher than or equal to a preset temperature threshold T0, the battery management module sends a stop command to the motor controller; in response to the stop command issued by the battery management module, the motor controller stops outputting the drive signal; and / or, the motor controller monitors the motor status. When the motor is in a working state, the motor controller stops outputting the drive signal.

[0062] The present invention utilizes the whole vehicle motor circuit to generate high-frequency pulses to pulse heat the inside of the power battery. The existing circuit is slightly modified and the modification cost is low. Battery heating can be achieved without increasing the cost. The heating power is large, the temperature rise speed is fast, the temperature is uniform, and the heating efficiency is high. In addition, the motor bus capacitor C and the stator inductance are used to store energy, which can increase the pulse current and improve the heating efficiency.

[0063] The present invention also provides a computer-readable storage medium on which a battery pulse heating program for a vehicle is stored. When the battery pulse heating program is executed by a processor, the battery pulse heating method described above is implemented.

[0064] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery pulse heating system, characterized in that: It includes an inverter connected to a battery pack E, a motor connected to the inverter, a main diode VD0, a motor controller and a battery management module, and a main switch K0 is provided between the inverter and the positive electrode of the battery pack E; The inverter comprises a capacitor C, a first phase bridge arm, a second phase bridge arm and a third phase bridge arm connected in parallel in sequence, the first phase bridge arm comprises a first upper bridge arm and a first lower bridge arm, the second phase bridge arm comprises a second upper bridge arm and a second lower bridge arm, and the third phase bridge arm comprises a third upper bridge arm and a third lower bridge arm; The motor includes a first stator inductor L1, a second stator inductor L2 and a third stator inductor L3, an input end of the first stator inductor L1 is connected to a connection point between the first upper bridge arm and the first lower bridge arm, an input end of the second stator inductor L2 is connected to a connection point between the second upper bridge arm and the second lower bridge arm, and an input end of the third stator inductor L3 is connected to a connection point between the third upper bridge arm and the third lower bridge arm; The positive electrode of the main diode VD0 is connected to the parallel end of the capacitor C, the first upper bridge arm, the second upper bridge arm and the third upper bridge arm, and the negative electrode of the main diode VD0 is connected to the positive electrode of the battery pack E; The battery management module is used to collect the state parameters of the battery pack E. When the state parameters of the battery pack E meet the preset heating conditions, the battery management module sends a heating instruction to the motor controller; The motor controller responds to the heating instruction issued by the battery management module, outputs a driving signal to control the preset target upper bridge arm switch to close, and periodically controls the main switch K0 and the preset target lower bridge arm switch to close and open synchronously; the target upper bridge arm and the target lower bridge arm are different phase bridge arms.

2. The battery pulse heating system according to claim 1, characterized in that: The anode connection point P0 of the main diode VD0 is arranged between the parallel connection point P1 of the first upper bridge arm and the parallel connection point P2 of the second upper bridge arm; or, the anode connection point P0 of the main diode VD0 is arranged at the parallel connection point P2 of the second upper bridge arm.

3. The battery pulse heating system according to claim 2, characterized in that: The target upper bridge arm is configured as a first upper bridge arm, and the target lower bridge arm is configured as at least one lower bridge arm that is out of phase with the target upper bridge arm.

4. The battery pulse heating system according to claim 1, characterized in that: The anode connection point P0 of the main diode VD0 is arranged after the parallel connection point P2 of the second upper bridge arm.

5. The battery pulse heating system according to claim 4, characterized in that: The target upper bridge arm is configured as a first upper bridge arm and / or a second upper bridge arm; the target lower bridge arm is configured as at least one lower bridge arm that is out of phase with the target upper bridge arm, and the parallel connection point of the upper bridge arm connected in series with the target lower bridge arm is located after the parallel connection point of the target upper bridge arm.

6. The battery pulse heating system according to claim 1, characterized in that: The motor controller responds to the heating instruction issued by the battery management module, outputs a driving signal, controls the main switch K0, and when the preset target lower bridge arm switch is disconnected, controls the upper bridge arm switch connected in series with the preset target lower bridge arm switch to be closed.

7. A vehicle, characterized in that: A battery pulse heating system comprising the battery pulse heating system according to any one of claims 1 to 6.

8. A battery pulse heating method, characterized in that: Applicable to the battery pulse heating system according to any one of claims 1 to 6, the battery pulse heating control method comprises: The battery management module collects the temperature T of the battery pack E. When the temperature T of the battery pack E is lower than a preset temperature threshold T0, the battery management module sends a heating instruction to the motor controller; The motor controller monitors the motor state. When the motor is in a non-working state, in response to a heating instruction issued by a battery management module, the motor controller outputs a drive signal to control the closing of a preset target upper bridge arm switch, and periodically controls the main switch K0 and the preset target lower bridge arm switch to close and open synchronously; the target upper bridge arm and the target lower bridge arm are different phase bridge arms.

9. The battery pulse heating method according to claim 1, characterized in that: The method further comprises: The battery management module monitors the temperature T of the battery pack E. When the temperature T of the battery pack E is higher than or equal to a preset temperature threshold T0, the battery management module sends a stop instruction to the motor controller; in response to the stop instruction sent by the battery management module, the motor controller stops outputting the drive signal; and / or, The motor controller monitors the state of the motor, and when the motor is in a working state, the motor controller stops outputting a driving signal.

10. A computer-readable storage medium, characterized in that: A battery pulse heating program of the vehicle is stored thereon, and when the battery pulse heating program is executed by the processor, the battery pulse heating method described in claims 8-9 is implemented.

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