Charging heating system and method and vehicle

Abstract

The invention provides a charging heating system and method and a vehicle, and the system comprises a power battery, a driving motor, a motor controller, a switch module, and a charging pile. The power battery is connected with the switch module, the charging pile is connected with the switch module, the driving motor is connected with the motor controller, and the motor controller is connected with the switch module; the on-off state of the motor controller and the on-off state of the switch module are combined, so that the charging heating system is in different working modes. The charging heating system has the advantages of being high in integration level and capable of achieving multiple functions.

Description

Technical Field

[0001] The present application relates to the field of new energy vehicles, and more specifically, to a charging and heating system, method and vehicle. Background Art

[0002] The prior art circuit system for heating the battery or the circuit system for controlling the charging of the battery does not have an integrated circuit system with high integration, taking into account safety and cost, which can realize functions such as boost and current reduction charging, buck and current increase charging, pulse charging and pulse heating. For example, patent CN203206120U provides a buck conversion circuit and a charger, which can realize uninterrupted buck conversion of the power supply through at least two buck circuits, wherein the first switch tube of one buck circuit combined with the inductor and the second switch tube can buck the power supply, and at the same time, the first switch tube of at least another buck circuit combined with the inductor and the second switch tube can uninterruptedly buck the power supply when the first switch tube in the above buck circuit is in the disconnected state, thereby making full use of the power supply, and its boost conversion efficiency is high, and at the same time, the loss of the first switch tube and the second switch tube is small, which can further increase the conversion efficiency of the entire buck conversion circuit, thereby effectively utilizing the energy of the power supply. Patent CN117341504 relates to a step-down charging system and a vehicle, the system comprising a battery pack, a multi-phase inverter and a multi-phase motor; the multi-phase inverter is connected in series with the multi-phase motor and then in parallel with the battery pack, and the multi-phase inverter is used to be connected to a charging pile; the multi-phase inverter and the multi-phase motor are used to reduce the first voltage output by the charging pile to a second voltage to charge the battery pack, wherein the second voltage is a specified charging voltage of the battery pack, so that the charging pile provides a lower charging voltage for the vehicle.

[0003] However, these two prior arts have the following technical defects:

[0004] 1. Low integration and single function. For example, it can realize voltage-boosting and current-reducing charging, but it is not compatible with voltage-boosting and current-reducing charging;

[0005] 2. Functional patchwork, complex system and high cost;

[0006] 3. Multiple failure modes and no safety redundancy design. Summary of the invention

[0007] The purpose of the embodiments of the present application is to provide a charging heating system, method and vehicle, which are used to overcome one of the above-mentioned technical defects.

[0008] In a first aspect, the present invention provides a charging heating system, the charging heating system comprising a power battery, a drive motor, a motor controller, a switch module, and a charging pile;

[0009] The power battery is connected to the switch module, the charging pile is connected to the switch module, the drive motor is connected to the motor controller, and the motor controller is connected to the switch module;

[0010] The on-off states of the motor controller and the switch module are combined to put the charging and heating system in different working modes.

[0011] The charging and heating system of the first aspect of the present application can use a switch module to put the system composed of a power battery, a drive motor, a motor controller, a switch module, and a charging pile into different working modes, thereby enabling the charging and heating system to have the advantages of high integration and the ability to realize multiple functions.

[0012] In the first aspect of the present application, as an optional implementation, the switch module includes a first switch, a second switch, a third switch, a fourth switch, and a fifth switch;

[0013] The first switch is connected to the fifth switch and connected to the charging pile;

[0014] The second switch is connected to the first switch and to the third switch;

[0015] The third switch is also connected to the driving motor;

[0016] The fourth switch is connected to the third switch and to the power battery;

[0017] The fifth switch is also connected to the power battery.

[0018] This optional implementation manner can implement the switch module through the first switch, the second switch, the third switch and the fourth switch and the fifth switch.

[0019] In the first aspect of the present application, as an optional implementation, the motor controller includes a three-phase bridge arm;

[0020] The midpoints of the three-phase bridge arms are respectively connected to the three-phase windings of the drive motor.

[0021] This optional implementation manner can respectively connect the three-phase windings of the drive motor through the midpoints of the three-phase bridge arms.

[0022] In the first aspect of the present application, as an optional implementation, the charging and heating system further includes a first capacitor;

[0023] The first capacitor is connected to the motor controller and to the power battery.

[0024] This optional implementation can use the first capacitor to perform functions such as energy storage, filtering, and pre-charging.

[0025] In the first aspect of the present application, as an optional implementation, the charging and heating system further includes a second capacitor;

[0026] The second capacitor is connected to the motor controller and to the fourth switch.

[0027] This optional implementation can use the second capacitor to perform functions such as energy storage, filtering, and pre-charging.

[0028] A second aspect of the present application provides a charging heating method, which is applied to a motor controller of the charging heating system of the first aspect, wherein the charging heating method comprises:

[0029] receiving a status instruction for the charging and heating system;

[0030] Based on the state instruction, the on-off state combination of the motor controller and the switch module is controlled to control the working mode of the charging heating system.

[0031] The method of the second aspect of the present application receives a status instruction for the charging and heating system, and then controls the on-off state combination of the motor controller and the switch module based on the status instruction to control the working mode of the charging and heating system.

[0032] In the second aspect of the present application, as an optional implementation, the operating mode of the charging and heating system includes a charging mode and a heating mode.

[0033] This optional implementation can control the on-off state combination of the motor controller and the switch module based on the state instruction, and control the charging and heating system to operate in the charging mode or the heating mode.

[0034] In the second aspect of the present application, as an optional implementation, the charging mode includes a direct charging mode, a boost and current reduction charging mode, a buck and current increase charging mode, and a pulse charging mode.

[0035] This optional implementation can control the on-off state combination of the motor controller and the switch module based on the state instruction, and control the charging and heating system to charge in direct charging mode, boost and current reducing charging mode, buck and current increasing charging mode, and pulse charging mode.

[0036] In the second aspect of the present application, as an optional implementation, the heating mode includes a pulse heating mode.

[0037] This optional implementation can control the on-off state combination of the motor controller and the switch module based on the state instruction, and control the charging heating system to heat in a pulse heating mode.

[0038] In the second aspect of the present application, as an optional implementation, the controlling the on-off state combination of the motor controller and the switch module based on the state instruction to control the working mode of the charging heating system includes:

[0039] When the state instruction indicates that the working mode of the charging and heating system is the direct charging mode, the first switch and the fifth switch are controlled to be closed, and the second switch, the third switch and the fourth switch are controlled to be opened.

[0040] This optional implementation can achieve the charging mode by controlling the first switch and the fifth switch to be closed, and the second switch, the third switch and the fourth switch to be open.

[0041] In the second aspect of the present application, as an optional implementation, the on-off state combination of the switch module is controlled based on the state instruction to control the working mode of the charging heating system, including:

[0042] When the state instruction indicates that the working mode of the charging and heating system is the boost and current drop charging mode, the second switch, the third switch and the fifth switch are controlled to be closed, and the first switch and the fourth switch are opened.

[0043] This optional implementation can achieve a boost-current-reducing charging mode by controlling the second switch, the third switch, and the fifth switch to be closed, and the first switch and the fourth switch to be opened.

[0044] In the second aspect of the present application, as an optional implementation, the controlling the on-off state combination of the motor controller and the switch module based on the state instruction to control the working mode of the charging heating system includes:

[0045] When the state instruction indicates that the working mode of the charging and heating system is the buck-current boost charging mode, the first switch, the third switch and the fourth switch are controlled to be closed, and the second switch and the fifth switch are controlled to be opened.

[0046] This optional implementation can achieve a buck-and-current boost charging mode by controlling the first switch, the third switch, and the fourth switch to be closed, and the second switch and the fifth switch to be open.

[0047] In the second aspect of the present application, as an optional implementation, the controlling the on-off state combination of the motor controller and the switch module based on the state instruction to control the working mode of the charging heating system includes:

[0048] When the state instruction indicates that the working mode of the charging and heating system is the pulse charging mode, the first switch and the fifth switch are controlled to be closed, and the second switch, the third switch and the fourth switch are controlled to be opened.

[0049] This optional implementation can realize the pulse charging mode by controlling the first switch and the fifth switch to be closed, and the second switch, the third switch and the fourth switch to be opened.

[0050] In the second aspect of the present application, as an optional implementation, the controlling the on-off state combination of the motor controller and the switch module based on the state instruction to control the working mode of the charging heating system includes:

[0051] When the state instruction indicates that the working mode of the charging heating system is the pulse heating mode, the fifth switch is controlled to be closed, and the first switch, the second switch, the third switch and the fourth switch are controlled to be opened.

[0052] This optional implementation can achieve a pulse heating mode by controlling the fifth switch to be closed and the first switch, the second switch, the third switch and the fourth switch to be opened.

[0053] In the second aspect of the present application, as an optional implementation, the charging heating method further includes:

[0054] When the fifth switch cannot be closed, the third switch and the fourth switch are controlled to be closed, and the first switch, the second switch and the fifth switch are opened.

[0055] This optional implementation can achieve a pulse heating mode by controlling the third switch and the fourth switch to close and the first switch, the second switch and the fifth switch to open when the fifth switch cannot be closed.

[0056] In the second aspect of the present application, as an optional implementation, the method further includes:

[0057] Obtaining a target heating power target;

[0058] The duty cycle of the bridge arm switch tube of the motor controller is controlled according to the target heating power target.

[0059] This optional implementation manner acquires the target heating power target, and can control the duty cycle of the bridge arm switch tube of the motor controller according to the target heating power target.

[0060] In a third aspect, the present invention provides a vehicle, comprising a system as described in any one of the aforementioned embodiments.

[0061] The charging heating system and vehicle of the present application are compatible with the powertrain, switching circuit and control method of battery heating, boost and current reducing charging, buck and current increasing charging and pulse charging. For example, the vehicle control unit performs a matching analysis on the capacity of the charging pile and the charging capacity of the battery, and then selects direct charging, boost and current reducing charging or buck and current increasing charging according to the analysis results, which greatly improves the charging applicability. Specifically, vehicles with high-voltage batteries can also be fully charged on low-voltage charging piles, and higher charging speeds can be achieved by boosting current charging on current-limited charging piles.

[0062] On the other hand, the present application can perform pulse charging. During charging, the pulse current can reduce the polarization of the battery, especially for low-rate trickle charging at the end of the battery, which can increase the charging rate and shorten the end charging time. The present invention can achieve pulse heating. Compared with external heating, the pulse internal heating method reduces heat loss and greatly improves the economic efficiency. It not only improves the low-temperature endurance of the power battery, but also greatly improves the safety performance and service life of the power battery.

[0063] In addition, the present application does not need to add too many wiring harnesses and controllers, and the cost is low. The system of the embodiment of the present application has redundant control: when a relay cannot be controlled, other switches can be used to control the function to continue to be available, and the pre-charge control and filtering control are realized through the action of the capacitor, which is safer and more efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0065] Figure 1 is a schematic diagram of a charging heating system provided in an embodiment of the present application;

[0066] Figure 2 is a schematic diagram of another charging heating system provided in an embodiment of the present application;

[0067] Figure 3 It is a flow chart of a charging heating method provided in an embodiment of the present application;

[0068] Figure 4 This is a schematic diagram of a charging pile directly charging a power battery provided by an embodiment of the present application;

[0069] Figure 5 This is a schematic diagram of a charging pile providing an embodiment of the present application for charging a power battery with a boost voltage and a current reduction;

[0070] Figure 6 This is a schematic diagram of a charging pile providing a charging method for a power battery with a reduced voltage and increased current;

[0071] Figure 7 This is a schematic diagram of a pulse charging process provided by an embodiment of the present application;

[0072] Figure 8a This is a schematic diagram of a pulse heating stage 1-power battery discharge process provided by an embodiment of the present application;

[0073] Figure 8b This is a schematic diagram of a pulse heating stage 2-power battery charging process provided in an embodiment of the present application;

[0074] Figure 9a This is a schematic diagram of another redundant path stage 1 of pulse heating provided by an embodiment of the present application - a power battery discharge process;

[0075] Figure 9b This is a schematic diagram of another redundant path stage 2 of pulse heating-power battery charging process provided by an embodiment of the present application;

[0076] Fig.10 It is a schematic diagram of another powertrain and its control system provided in an embodiment of the present application.

[0077] Icons: power battery 101, motor controller 102, drive motor 103, switch module 104, charging pile 105, first capacitor C1, second capacitor C2, first switch K1, second switch K2, third switch K3, fourth switch K4, fifth switch K5. DETAILED DESCRIPTION

[0078] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0079] The existing circuit systems for heating batteries or controlling battery charging do not yet have an integrated circuit system with high integration and a balance between safety and cost, which can realize functions such as boost and current reduction charging, buck and current increase charging, pulse charging and pulse heating.

[0080] However, the circuit system of the prior art cannot realize multiple modes in one system, that is, it is impossible to realize multiple modes such as direct charging mode, boost and current reducing charging mode, buck and current increasing charging mode, pulse charging mode, and pulse heating mode based on one circuit system. Therefore, the circuit system of the prior art has the defects of low integration and single function.

[0081] Based on the above technical problems, the charging heating system of the embodiment of the present application can, through the switch module, enable the system composed of a power battery, a drive motor, a motor controller, a switch module, and a charging pile to be in different working modes, thereby enabling the charging heating system to have the advantages of high integration and the ability to realize multiple functions.

[0082] The method of the embodiment of the present application receives a status instruction for the charging and heating system, and then controls the on-off state combination of the motor controller and the switch module based on the status instruction to control the working mode of the charging and heating system.

[0083] Embodiment 1

[0084] See also Figure 1 , Figure 1 Schematic diagram of a dynamic charging heating system provided in an embodiment of the present application. Figure 1 As shown, the charging and heating system includes a power battery 101, a drive motor 103, a motor controller 102, a switch module 104, and a charging pile 105, wherein the power battery 101 is connected to the switch module 104, the charging pile 105 is connected to the switch module 104, the drive motor 103 is connected to the motor controller 102, the motor controller 102 is connected to the switch module 104, and the on-off state combination of the motor controller 102 and the switch module 104 enables the charging and heating system to be in different working modes.

[0085] The charging heating system of the embodiment of the present application can use a switch module to put the system composed of a power battery, a drive motor, a motor controller, a switch module, and a charging pile into different working modes, thereby enabling the charging heating system to have the advantages of high integration and the ability to realize multiple functions.

[0086] For further information, see Figure 2 , Figure 2 Schematic diagram of another dynamic charging heating system provided in an embodiment of the present application. Figure 2 As shown, the switch module 104 includes a first switch K1, a second switch K2, a third switch K3, a fourth switch K4, and a fifth switch K5, wherein the combination of the on-off states of the first switch K1, the second switch K2, the third switch K3, the fourth switch K4, and the fifth switch K5 is used to control the switching of the working mode of the system.

[0087] In the embodiment of the present application, the first switch K1 , the second switch K2 , the third switch K3 , the fourth switch K4 , and the fifth switch K5 may refer to relays.

[0088] In the embodiment of the present application, the charging pile is a super charging pile or a common charging pile on the market.

[0089] In the embodiment of the present application, the drive motor may refer to a motor including a three-phase winding.

[0090] In an embodiment of the present application, as an optional implementation, the motor controller includes a three-phase bridge arm, and the midpoints of the three-phase bridge arms are respectively connected to the three-phase windings of the drive motor.

[0091] This optional implementation manner can respectively connect the three-phase windings of the drive motor through the midpoints of the three-phase bridge arms.

[0092] In the embodiment of the present application, as an optional implementation, the charging and heating system also includes a first capacitor, which is connected to the motor controller and to the power battery.

[0093] This optional implementation can use the first capacitor to perform functions such as energy storage, filtering, and pre-charging.

[0094] In the embodiment of the present application, as an optional implementation, the charging and heating system further includes a second capacitor, which is connected to the motor controller and to the fourth switch.

[0095] This optional implementation can use the second capacitor to perform functions such as energy storage, filtering, and pre-charging.

[0096] Embodiment 2

[0097] See also Figure 3 , Figure 3 is a flow chart of a charging heating method provided in an embodiment of the present application, wherein the charging heating method is applied to a control unit of a charging heating system, wherein the control unit may be a vehicle controller VCU. Figure 3 As shown, the charging heating method includes the following steps:

[0098] S1. receiving a status instruction for a charging and heating system;

[0099] S2. Control the on / off state combination of the motor controller and the switch module based on the state command to control the working mode of the charging heating system.

[0100] The method of the embodiment of the present application receives a status instruction for the charging and heating system, and then controls the on-off state combination of the motor controller and the switch module based on the status instruction to control the working mode of the charging and heating system.

[0101] In the embodiment of the present application, as an optional implementation, the working mode of the charging and heating system includes a charging mode and a heating mode.

[0102] This optional implementation can control the on-off state combination of the motor controller and the switch module based on the state instruction, and control the charging and heating system to operate in the charging mode or the heating mode.

[0103] In the embodiment of the present application, as an optional implementation mode, the charging mode includes a direct charging mode, a boost and current reduction charging mode, a buck and current increase charging mode, and a pulse charging mode.

[0104] This optional implementation can control the on-off state combination of the motor controller and the switch module based on the state instruction, and control the charging and heating system to charge in direct charging mode, boost and current reducing charging mode, buck and current increasing charging mode, and pulse charging mode.

[0105] In the embodiment of the present application, as an optional implementation, the heating mode includes a pulse heating mode.

[0106] This optional implementation can control the on-off state combination of the motor controller and the switch module based on the state instruction, and control the charging heating system to heat in a pulse heating mode.

[0107] In the embodiment of the present application, as an optional implementation, the on-off state combination of the motor controller and the switch module is controlled based on the state instruction to control the working mode of the charging heating system, including:

[0108] When the state instruction indicates that the working mode of the charging and heating system is the direct charging mode, the first switch and the fifth switch are controlled to be closed, and the second switch, the third switch and the fourth switch are controlled to be opened.

[0109] This optional implementation can achieve the charging mode by controlling the first switch and the fifth switch to be closed, and the second switch, the third switch and the fourth switch to be open.

[0110] For this optional implementation, see Figure 4 , Figure 4 Schematic diagram of a charging pile directly charging a power battery provided in an embodiment of the present application. Figure 4 As shown, in the direct charging mode, the charging current is directly input from the charging pile 105 to the power battery 101. The first switch K1 and the fifth switch K5 in the switch module are closed, the second switch K2, the third switch K3 and the fourth switch K4 are all disconnected, and the motor controller and the power motor do not participate in the work. The current is output from the charging pile 105 and enters the power battery 101 through the first switch K1 and the second switch K5.

[0111] In the embodiment of the present application, as an optional implementation, the on-off state combination of the motor controller and the switch module is controlled based on the state instruction to control the working mode of the charging heating system, including:

[0112] When the state instruction indicates that the working mode of the charging and heating system is the boost and current drop charging mode, the second switch, the third switch and the fifth switch are controlled to be closed, and the first switch and the fourth switch are opened.

[0113] This optional implementation can achieve a boost-current-reducing charging mode by controlling the second switch, the third switch, and the fifth switch to be closed, and the first switch and the fourth switch to be opened.

[0114] For the above optional implementations, please refer to Figure 5 , Figure 5 This is a schematic diagram of a charging pile providing a charging method for a power battery with a voltage-boosting and current-reducing method. Figure 5 As shown, in the boost and current reduction charging mode, the charging current is output from the charging pile 105, passes through the drive motor 103, then passes through the motor controller 102, and then inputs into the power battery 101. K2, K3 and K5 in the switch module are closed, K1 and K4 are disconnected, the current is output from the charging pile 105, and the bridge arm in the motor controller 102 is used to control the current to enter from one end of the winding of the motor 103, and then pass through the motor controller 102 and output from the other end of the winding. The charging current is output from the charging pile 105, passes through the drive motor 103, then passes through the motor controller 102, and then inputs into the power battery 101.

[0115] In the embodiment of the present application, as an optional implementation, controlling the on-off state combination of the motor controller and the switch module based on the state instruction to control the working mode of the charging heating system includes the following sub-steps:

[0116] When the state instruction indicates that the working mode of the charging and heating system is the buck-current boost charging mode, the first switch, the third switch and the fourth switch are controlled to be closed, and the second switch and the fifth switch are controlled to be opened.

[0117] This optional implementation can achieve a buck-and-current boost charging mode by controlling the first switch, the third switch, and the fourth switch to be closed, and the second switch and the fifth switch to be open.

[0118] For the above optional implementations, please refer to Figure 6 , Figure 6 This is a schematic diagram of a charging pile providing a charging method for a power battery with a voltage reduction and current increase, as provided in an embodiment of the present application. Figure 6 As shown, in the buck-boost charging mode, the charging current is output from the charging pile 105, passes through the motor controller 102, then passes through the drive motor 103, and then enters the power battery 101; K1, K3 and K4 in the switch module are closed, K2 and K5 are disconnected, the current is output from the charging pile 105, enters the motor controller 102 through K1, and the bridge arm in the motor controller 102 is turned on and off to control the current to enter from one end, and then pass through the motor 103 winding and output from the other end. The charging current is output from the charging pile 105, passes through the motor controller 102, then passes through the drive motor 103, and then enters the power battery 101.

[0119] In the embodiment of the present application, as an optional implementation, controlling the on-off state combination of the motor controller and the switch module based on the state instruction to control the working mode of the charging heating system includes the following sub-steps:

[0120] When the state instruction indicates that the working mode of the charging and heating system is the pulse charging mode, the first switch and the fifth switch are controlled to be closed, and the second switch, the third switch and the fourth switch are controlled to be opened.

[0121] This optional implementation can realize the pulse charging mode by controlling the first switch and the fifth switch to be closed, and the second switch, the third switch and the fourth switch to be opened.

[0122] For the above optional implementations, please refer to Figure 7 , Figure 7 Schematic diagram of a pulse charging process provided by an embodiment of the present application. Figure 7 As shown, in the pulse charging mode, the charging pile 105 directly charges the power battery 101, and at the same time, the battery realizes pulse current through the switch controller 104, the motor controller 102 and the drive motor 103, thereby realizing pulse charging. K1 and K5 in the switch module are closed, K2, K3 and K4 are disconnected, and the current is output from the charging pile 105 and enters the battery through K1 and K5. At the same time, the bridge arm in the motor controller 102 is used to control the current to enter from one end, and then pass through the winding of the motor 103 to store energy, and then release the energy to the power battery 101.

[0123] In the embodiment of the present application, as an optional implementation, controlling the on-off state combination of the motor controller and the switch module based on the state instruction to control the working mode of the charging heating system includes the following sub-steps:

[0124] When the state instruction indicates that the working mode of the charging heating system is the pulse heating mode, the fifth switch is controlled to be closed, and the first switch, the second switch, the third switch and the fourth switch are controlled to be opened.

[0125] This optional implementation can achieve a pulse heating mode by controlling the fifth switch to be closed and the first switch, the second switch, the third switch and the fourth switch to be opened.

[0126] For the above optional implementations, please refer to Figure 8a , Figure 8a 1 is a schematic diagram of a pulse heating stage 1-power battery discharge process provided by an embodiment of the present application. Figure 8a As shown, during the discharge process, current is output from the power battery 101, passes through K5, and then controls the current to enter from one end through the bridge arm in the motor controller 102, and then passes through the winding of the motor 103 to store energy.

[0127] For the above optional implementations, please refer to Figure 8b , Figure 8b Schematic diagram of the pulse heating stage 2-power battery charging process provided by the embodiment of the present application. Figure 8b As shown, the charging process releases energy to the battery, and the current is controlled from the winding of the motor 103 through the bridge arm in the motor controller 102, passes through K5, and is then input into the power battery 101.

[0128] In the embodiment of the present application, as an optional implementation, the charging heating method of the embodiment of the present application further includes the following steps:

[0129] When the fifth switch cannot be closed, the third switch and the fourth switch are controlled to be closed, and the first switch, the second switch and the fifth switch are opened.

[0130] This optional implementation can achieve a pulse heating mode by controlling the third switch and the fourth switch to close and the first switch, the second switch and the fifth switch to open when the fifth switch cannot be closed.

[0131] For the above optional implementations, please refer to Figure 9a , Figure 9a 1 is a schematic diagram of another redundant path stage 1 of pulse heating provided by the embodiment of the present application - power battery discharge process. Figure 9a As shown, the current is output from the power battery 101, passes through K4 and K3, passes through the winding of the motor 103, and is then controlled by the bridge arm in the motor controller 102, so that the current enters from one end and then stores energy.

[0132] For the above optional implementations, please refer to Figure 9b ,yes Figure 9b 2 is a schematic diagram of another redundant path stage 2 of pulse heating provided by the embodiment of the present application - power battery charging process. Figure 9b As shown, the charging process releases energy to the battery, and the current flows from the bridge arm of the controller 102, drives the winding of the motor 103, passes through K4 and K3, and is then input into the power battery 101.

[0133] In the embodiment of the present application, as an optional implementation, the method of the embodiment of the present application further includes the following steps:

[0134] Obtaining a target heating power target;

[0135] The duty cycle of the bridge arm switch tube of the motor controller is controlled according to the target heating power target.

[0136] This optional implementation method can obtain the target heating power target and then control the duty cycle of the bridge arm switch tube of the motor controller according to the target heating power target.

[0137] For the above optional implementation, after the power battery heating mode is turned on, the motor controller is used to control the upper bridge arm switch tube and the lower bridge arm switch tube to open and close at one duty cycle in one period; in another period, the upper bridge arm switch tube and the lower bridge arm switch tube are controlled to open and close at another duty cycle, so as to control the amplitude and effective value of the heating current in different periods, and further realize the control of the heating power. Thus, it is possible to meet the requirements of different heating powers through a variable duty cycle.

[0138] The charging heating system of the embodiment of the present application is compatible with the powertrain, switching circuit and control method of battery heating, boost and current reducing charging, buck and current increasing charging and pulse charging. For example, the vehicle control unit performs a matching analysis on the capacity of the charging pile and the charging capacity of the battery, and then selects direct charging, boost and current reducing charging or buck and current increasing charging according to the analysis results, which greatly improves the charging applicability. Specifically, vehicles with high-voltage batteries can also be fully charged on low-voltage charging piles, and higher charging speeds can be achieved by boosting current charging on current-limited charging piles.

[0139] On the other hand, the embodiment of the present application can perform pulse charging. During charging, the pulse current can reduce the polarization of the battery, especially for low-rate trickle charging at the end of the battery, which can increase the charging rate and shorten the end charging time. The present invention can achieve pulse heating. Compared with external heating, the pulse internal heating method reduces heat loss and greatly improves the economy. It not only improves the low-temperature endurance of the power battery, but also greatly improves the safety performance and service life of the power battery.

[0140] In addition, the system of the embodiment of the present application does not need to add too many wiring harnesses and controllers, and the cost is low. The system of the embodiment of the present application has redundant control: when a relay cannot be controlled, other switches can be controlled to achieve continued availability of functions, and pre-charge control and filtering control can be achieved through the action of capacitors, which is safer and more efficient.

[0141] Please note that Fig.10 , Fig.10 Schematic diagram of another powertrain and its control system provided by the embodiment of the present application. Fig.10 As shown, the power assembly includes a power battery 101, a motor controller 102, a drive motor 103, a switch module 104, a charging pile 105, capacitors C1 and C2. The three-phase winding of the drive motor leads out a connecting line through a center point.

[0142] In addition, an embodiment of the present application also provides a vehicle, which includes a system as described in any of the aforementioned implementation modes.

[0143] As an example, the vehicle control unit VCU analyzes, calculates, and makes conditional judgments on information such as ambient temperature, battery temperature, battery SOC, change in battery discharge capacity, discharge power, and vehicle speed to control whether the vehicle meets the conditions for entering or exiting power battery heating.

[0144] Furthermore, pulse heating is a self-heating system for power batteries. It does not require an additional energy supply system and has high heating efficiency for power batteries. Compared with external heating, it reduces heat loss and greatly improves economic efficiency. It not only improves the low-temperature endurance of power batteries, but also greatly improves the safety performance and service life of power batteries.

[0145] Furthermore, when the vehicle enters the charging mode, the present invention performs a matching analysis on the capacity of the charging pile and the charging capacity of the battery through the vehicle control unit, and selects direct charging, boost and current reduction charging, or buck and current increase charging.

[0146] Furthermore, the embodiments of the present application can improve the charging applicability of electric vehicles, so that models with high-voltage batteries can also be fully charged on low-voltage charging piles, and higher charging speeds can be achieved through up-current charging on current-limited charging piles.

[0147] Furthermore, the embodiments of the present application can realize pulse charging. During charging, the pulse current can reduce the polarization of the battery, especially for low-rate trickle charging at the end of the battery, which can increase the charging rate and shorten the end charging time.

[0148] In the embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, and the indirect coupling or communication connection of devices or units can be electrical, mechanical or other forms.

[0149] In addition, the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0150] Furthermore, the functional modules in the various embodiments of the present application may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.

[0151] In this document, relational terms such as first and second, etc. are used merely to distinguish one entity or operation from another entity or operation, but do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0152] The above are only embodiments of the present application and are not intended to limit the scope of protection of the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of protection of the present application.

Claims

1. A charging heating system, characterized in that: The charging and heating system includes a power battery, a drive motor, a motor controller, a switch module, and a charging pile; The power battery is connected to the switch module, the charging pile is connected to the switch module, the drive motor is connected to the motor controller, and the motor controller is connected to the switch module; The on-off states of the motor controller and the switch module are combined to put the charging and heating system in different working modes.

2. The charging heating system according to claim 1, characterized in that: The switch module includes a first switch, a second switch, a third switch, a fourth switch and a fifth switch; The first switch is connected to the fifth switch and connected to the charging pile; The second switch is connected to the first switch and to the third switch; The third switch is also connected to the driving motor; The fourth switch is connected to the third switch and to the power battery; The fifth switch is also connected to the power battery.

3. The charging heating system according to claim 1, characterized in that: The motor controller comprises a three-phase bridge arm; The midpoints of the three-phase bridge arms are respectively connected to the three-phase windings of the drive motor.

4. The charging heating system according to claim 1, characterized in that: The charging and heating system further includes a first capacitor; The first capacitor is connected to the motor controller and to the power battery.

5. The charging heating system according to claim 1, characterized in that: The charging and heating system further includes a second capacitor; The second capacitor is connected to the motor controller and to the fourth switch.

6. A charging heating method, characterized in that: The charging heating method is applied to the charging heating system according to any one of claims 1 to 5, wherein the charging heating method comprises: receiving a status instruction for the charging and heating system; Based on the state instruction, the on-off state combination of the motor controller and the switch module is controlled to control the working mode of the charging heating system.

7. The charging heating method according to claim 6, characterized in that: The operation modes of the charging and heating system include a charging mode and a heating mode.

8. The charging heating method according to claim 7, characterized in that: The charging modes include direct charging mode, boost and current reducing charging mode, buck and current increasing charging mode, and pulse charging mode.

9. The charging heating method according to claim 7, characterized in that: The heating mode includes a pulse heating mode.

10. The charging heating method according to claim 8, characterized in that: The controlling the on-off state combination of the motor controller and the switch module based on the state instruction to control the working mode of the charging heating system includes: When the state instruction indicates that the working mode of the charging and heating system is the direct charging mode, the first switch and the fifth switch are controlled to be closed, and the second switch, the third switch and the fourth switch are controlled to be opened.

11. The charging heating method according to claim 8, characterized in that: The controlling the on-off state combination of the motor controller and the switch module based on the state instruction to control the working mode of the charging heating system includes: When the state instruction indicates that the working mode of the charging and heating system is the boost and current drop charging mode, the second switch, the third switch and the fifth switch are controlled to be closed, and the first switch and the fourth switch are opened.

12. The charging heating method according to claim 8, characterized in that: The controlling the on-off state combination of the motor controller and the switch module based on the state instruction to control the working mode of the charging heating system includes: When the state instruction indicates that the working mode of the charging and heating system is the buck-current boost charging mode, the first switch, the third switch and the fourth switch are controlled to be closed, and the second switch and the fifth switch are controlled to be opened.

13. The charging heating method according to claim 8, characterized in that: The controlling the on-off state combination of the motor controller and the switch module based on the state instruction to control the working mode of the charging heating system includes: When the state instruction indicates that the working mode of the charging and heating system is the pulse charging mode, the first switch and the fifth switch are controlled to be closed, and the second switch, the third switch and the fourth switch are controlled to be opened.

14. The charging heating method according to claim 9, characterized in that: The controlling the on-off state combination of the motor controller and the switch module based on the state instruction to control the working mode of the charging heating system includes: When the state instruction indicates that the working mode of the charging heating system is the pulse heating mode, the fifth switch is controlled to be closed, and the first switch, the second switch, the third switch and the fourth switch are controlled to be opened.

15. The charging heating method according to claim 14, characterized in that: The charging and heating method further includes: When the fifth switch cannot be closed, the third switch and the fourth switch are controlled to be closed, and the first switch, the second switch and the fifth switch are opened.

16. The charging heating method according to claim 14, characterized in that: The method further comprises: Obtaining a target heating power target; The duty cycle of the bridge arm switch tube of the motor controller is controlled according to the target heating power target.

17. A vehicle, characterized in that: The vehicle comprises the charging heating system according to any one of claims 1 to 5 and executes the charging heating method according to any one of claims 7 to 16.

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