Charging control device, method, and vehicle

Abstract

The application discloses a charging control device, a method and a vehicle. A first coil is connected between an output end of an inverter and a charging port, a battery pack, the inverter, a distribution box and the charging port form a first voltage-boosting charging circuit, and the battery pack, the inverter, a motor, the distribution box and the charging port form a second voltage-boosting charging circuit. When the charging port is connected to the current of a charging pile, the first voltage-boosting circuit is controlled to be opened or closed, so that the battery pack is subjected to first voltage-boosting charging with low charging power, or the second voltage-boosting circuit is controlled to be opened or closed, so that the battery pack is subjected to second voltage-boosting charging with high charging power. The method can realize voltage-boosting charging of the battery pack of the vehicle by adding the distribution box. For the current mass-produced vehicle model, the voltage-boosting charging function can be upgraded without replacing the electric drive assembly, and the cost is low.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, in particular to a charging control device, method and vehicle. BACKGROUND

[0002] Part of the 400V voltage charging piles in the existing market cannot adapt to the 800V voltage battery pack of the vehicle, resulting in the situation that the charging pile cannot charge the vehicle.

[0003] The prior art usually reuses the existing motor and motor drive module on the vehicle, modifies the internal structure of the motor to become a voltage boosting charging component, converts the voltage provided by the power supply device into the voltage required by the battery, and charges the battery. This method modifies the internal structure of the motor at the design stage, which is suitable for newly designed vehicle models. For currently mass-produced vehicle models, the electric drive assembly needs to be replaced to realize the upgrade of the voltage boosting charging function. However, developing a new assembly mold and production line modification costs a lot of money and has high cost, so the economic rationality is poor. SUMMARY

[0004] The present application provides a charging control device, method and vehicle to solve the technical problem of high economic cost in the prior art for replacing the electric drive assembly of the vehicle to realize the upgrade of the voltage boosting charging function.

[0005] In view of the above problems, the present application is proposed to provide a charging control device, method and vehicle that overcome the above problems or at least partially solve the above problems.

[0006] In a first aspect, the present application provides a charging control device, comprising a battery pack, an inverter, a motor, a power distribution box and a charging port;

[0007] The battery pack comprises a positive electrode and a negative electrode;

[0008] The inverter comprises a positive electrode port, a negative electrode port and an output port, the positive electrode port is connected with the positive electrode of the battery pack, and the negative electrode port is connected with the negative electrode of the battery pack;

[0009] The motor comprises a stator winding, and the stator winding is connected with the output port of the inverter;

[0010] The power distribution box comprises a first coil, a first end of the first coil is connected with the output port of the inverter and the stator winding;

[0011] The charging port comprises a positive electrode and a negative electrode, the positive electrode of the charging port is connected with a second end of the first coil, and the negative electrode of the charging port is connected with the negative electrode port of the inverter and the negative electrode of the battery pack; wherein the battery pack, the inverter, the power distribution box and the charging port form a first voltage boosting charging loop, and the battery pack, the inverter, the motor, the power distribution box and the charging port form a second voltage boosting charging loop;

[0012] When the charging port accesses the current of the charging pile, the inverter is configured to control the first boost circuit to be switched on or off to perform first boost charging on the battery pack, or control the second boost circuit to be switched on or off to perform second boost charging on the battery pack, wherein the charging power of the first boost charging is less than the charging power of the second boost charging.

[0013] Optionally, the inverter comprises a first inverter bridge, a second inverter bridge and a third inverter bridge connected in parallel, the upper bridge arm of the first inverter bridge, the upper bridge arm of the second inverter bridge and the upper bridge arm of the third inverter bridge are connected with the positive electrode port of the inverter respectively; the lower bridge arm of the first inverter bridge, the lower bridge arm of the second inverter bridge and the lower bridge arm of the third inverter bridge are connected with the negative electrode port of the inverter respectively; the output end of the first inverter bridge is connected with the output port of the inverter, for controlling the first boost circuit to be switched on or off; the output end of the second inverter bridge and the output end of the third inverter bridge are connected with the output port of the inverter, for controlling the second boost circuit to be switched on or off.

[0014] Optionally, the stator winding comprises a first winding coil, a second winding coil and a third winding coil connected in an angular manner, the connection point of the first winding coil and the second winding coil is connected with the output end of the first inverter bridge and the first end of the first coil, the connection point of the second winding coil and the third winding coil is connected with the output end of the second inverter bridge, and the connection point of the third winding coil and the first winding coil is connected with the output end of the third inverter bridge.

[0015] Optionally, the power distribution box further comprises a first capacitor, the first end of the first capacitor is connected with the second end of the first coil and the positive electrode of the charging port, and the second end of the first capacitor is connected with the negative electrode of the battery pack and the negative electrode of the charging port; when the voltage of the first capacitor is detected to be less than a preset target voltage, the inverter is configured to control the charging circuit composed of the battery pack, the first coil and the first capacitor to be closed, so that the battery pack charges the first capacitor; when the voltage of the first capacitor is detected to be equal to the preset target voltage, the inverter is configured to control the charging circuit to be disconnected, wherein the target voltage is less than the output voltage of the charging pile.

[0016] Optionally, the power distribution box further comprises a bleeder resistor and a bleeder switch, the bleeder resistor and the bleeder switch are connected in series between the first end of the first capacitor and the second end of the first capacitor to form a discharging circuit, and the bleeder switch is configured to control the discharging circuit to be conducted to release the electric quantity of the first capacitor when the battery pack reaches a preset charging completion condition is detected.

[0017] Optionally, the positive electrode of the charging port is connected with the positive electrode of the battery pack, the device further comprises a first on-off mechanism arranged between the positive electrode of the charging port and the positive electrode of the battery pack, and a second on-off mechanism arranged between the negative electrode of the charging port and the negative electrode of the battery pack; when the charging port accesses the current of the charging pile, the first on-off mechanism and the second on-off mechanism are configured to control the direct current charging circuit composed of the battery pack and the charging port to be conducted, so that the battery pack is directly charged.

[0018] In a second aspect, the application provides a charging control method applied to the charging control device of the first aspect, the method comprising:

[0019] obtaining the battery pack parameters and the charging pile parameters;

[0020] determining a target charging power for boosting charging the battery pack according to the battery pack parameters and the charging pile parameters;

[0021] when the charging port is connected to the current of the charging pile, if the target charging power is less than a preset power threshold, controlling the first boosting circuit to be switched on or off to perform first boosting charging on the battery pack;

[0022] if the target charging power is greater than or equal to the preset power threshold, controlling the second boosting circuit to be switched on or off to perform second boosting charging on the battery pack, wherein the charging power of the first boosting charging is less than the charging power of the second boosting charging.

[0023] Optionally, after obtaining the battery pack parameters and the charging pile parameters, the method further comprises:

[0024] determining a charging type for charging the battery pack according to the battery pack parameters and the charging pile parameters, the charging type comprising boosting charging and direct current charging;

[0025] if it is determined that the charging type is boosting charging, performing the step of determining the target charging power for boosting charging the battery pack according to the battery pack parameters and the charging pile parameters.

[0026] Optionally, if it is determined that the charging type is direct current charging, determining a target charging power for direct current charging the battery pack according to the battery pack parameters and the charging pile parameters, and controlling a direct current charging loop formed by the battery pack and the charging port to be turned on to perform direct current charging on the battery pack.

[0027] In a third aspect, the application also provides a vehicle comprising the charging control device of the first aspect.

[0028] In a fourth aspect, the application also provides a server comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the server performs the method provided in the second aspect.

[0029] In a fifth aspect, the application also provides a computer readable storage medium storing a computer program, wherein when the computer program is executed by a processor, the computer performs the method provided in the second aspect.

[0030] In a sixth aspect, the present application also provides a computer program product comprising a computer program which, when executed by a computer, causes the computer to perform the method according to the second aspect.

[0031] The technical solutions provided by the present application have at least the following technical effects or advantages:

[0032] The charging control device, method and vehicle provided by the present application have the following technical effects or advantages:

[0033] The above description is only a summary of the technical solutions of the present application. In order to enable a clearer understanding of the technical means of the present application, the present application can be implemented according to the content of the description, and in order to enable the above and other purposes, features and advantages of the present application to be more obvious and easy to understand, the specific embodiments of the present application are described below. BRIEF DESCRIPTION OF DRAWINGS

[0034] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are intended to depict only preferred embodiments of the application and therefore should not be considered to narrow the scope of the present application. Rather the entire disclosure including the drawings is to be considered as illustrative and not restrictive of the application. There is no implication that the apparatus illustrated in the drawings is the only apparatus that will operate or will be advantageous based on the teachings herein. In addition, while the components of the drawing can be drawn in certain configurations, it should be understood that changes in configuration can occur when the components are manufactured and used in different environments. Accordingly, no inference should be drawn regarding dependencies or requirements exemplified by the configurations of the drawing.

[0035] Figure 1 The charging control device line diagram in the embodiments of the present application;

[0036] Figure 2 The charging control device electrical diagram in the embodiments of the present application Figure One ;

[0037] Figure 3 The charging control device structure in the embodiments of the present application Figure One ;

[0038] Figure 4 The charging control device structure in the embodiments of the present application Figure Two ;

[0039] Figure 5 The charging control method flow in the embodiments of the present application Figure One ;

[0040] Figure 6 For the charging control method flow in the embodiments of the present application Figure Two ;

[0041] Figure 7 For the vehicle wireframe in the embodiments of the present application Figure One ;

[0042] Figure 8 For the vehicle wireframe in the embodiments of the present application Figure Two . DETAILED DESCRIPTION

[0043] Exemplary embodiments of the present disclosure will be described in detail with reference to the drawings.

[0044] Various structural schematic diagrams according to embodiments of the present application are shown in the drawings. These diagrams are not drawn to scale, in which certain details are exaggerated for clarity of presentation and can omit certain details. The shapes of various regions, layers shown in the drawings and their relative size, positional relationship may deviate in actuality due to manufacturing tolerance or technical limitation, and the skilled in the art can additionally design regions / layers with different shapes, sizes, relative positions according to actual needs.

[0045] In order to facilitate the clear description of the technical solutions of the embodiments of the present application, in the embodiments of the present application, the same items or similar items with basically the same function and role are distinguished by using "first", "second" and the like. For example, the first value and the second value are only used to distinguish different values, and do not limit the order. The skilled in the art can understand that "first", "second" and the like do not limit the quantity and execution order, and "first", "second" and the like do not necessarily mean different.

[0046] It should be noted that in the present application, "exemplary" or "for example" and the like are used to represent as an example, illustration or description. Any embodiment or design scheme described as "exemplary" or "for example" in the present application should not be interpreted as more preferred or more advantageous than other embodiments or design schemes. Rather, the use of "exemplary" or "for example" and the like is intended to present the relevant concept in a specific manner.

[0047] In the present application, "at least one" means one or more, and "multiple" means two or more. The association relationship of the associated objects is described by "and / or", which means that there can be three kinds of relationships, for example, A and / or B, which can represent the following three cases: A exists alone, A and B exist together, and B exists alone, where A and B can be singular or plural. The character " / " generally represents an "or" relationship between the associated objects before and after it. "At least one of the following" or similar expressions means any combination of these items, including single or multiple combinations. For example, at least one of a, b, or c can represent a, b, c, a-b, a-c, b-c, or a-b-c, where a, b, and c can be single or multiple.

[0048] In order to better understand the above technical solutions, the above technical solutions will be described in detail below in conjunction with specific embodiments. It should be understood that the embodiments of the present disclosure and the specific features in the embodiments are detailed descriptions of the technical solutions of the present application, and are not limitations of the technical solutions of the present application. In the case of no conflict, the technical features in the embodiments of the present application and the embodiments can be combined with each other.

[0049] With the popularity of electric vehicles, public charging piles are installed in different places such as cities, suburbs, and highway service areas. The widely distributed charging piles can eliminate the concerns of potential users about the endurance mileage and charging convenience of electric vehicles, thereby promoting the popularity of electric vehicles and meeting the charging needs of different users. With the development of electric vehicles, the charging voltage of some electric vehicle battery packs is increased to more than 800V, so that the original 400V voltage charging pile cannot adapt to the 800V voltage battery pack of the vehicle, resulting in the situation that the charging pile cannot charge the vehicle. If the charging pile is replaced with an 800V voltage charging pile, the problem of not being able to directly charge the vehicle with a 400V voltage battery pack will occur, and the replacement cost of the widely distributed charging piles is very high.

[0050] The prior art usually reuses the existing motor and motor drive module on the vehicle, and modifies the internal structure of the motor to form a voltage boosting charging assembly, which converts the voltage provided by the charging pile into the voltage required by the battery pack of the vehicle, and charges the battery pack. This method needs to modify the internal structure of the motor in the design stage, which is suitable for newly designed vehicle models. For currently mass-produced vehicle models, the electric drive assembly needs to be replaced to realize the upgrade of the voltage boosting charging function. However, the development of new assembly molds and the modification of production lines are expensive and costly, so the economic rationality is poor.

[0051] In a first aspect, the embodiments of the present application provide a charging control device, please refer to Figure 1 , Figure 1The above is a wireframe diagram of the charging control device in an embodiment of this application. The charging control device provided in this embodiment includes a battery pack 101, an inverter 102, a motor 103, a power distribution box 104, and a charging port 105.

[0052] like Figure 2 As shown, the battery pack 101 includes a positive terminal and a negative terminal; the inverter 102 includes a positive terminal port, a negative terminal port, and an output port. The positive terminal port of the inverter 102 is connected to the positive terminal of the battery pack 101, and the negative terminal port of the inverter 102 is connected to the negative terminal of the battery pack 101. The motor 103 includes a stator winding 1031, which is connected to the output port of the inverter 102. The distribution box 104 includes a first coil 1041, the first end of which is connected to the output port of the inverter 102 and the stator winding 1031.

[0053] The charging port 105 includes a positive terminal and a negative terminal. The positive terminal of the charging port 105 is connected to the second end of the first coil 1041, and the negative terminal of the charging port 105 is connected to the negative terminal of the inverter 102 and the negative terminal of the battery pack 101. The battery pack 101, inverter 102, power distribution box 104 and charging port 105 form a first boost charging circuit, and the battery pack 101, inverter 102, motor 103, power distribution box 104 and charging port 105 form a second boost charging circuit.

[0054] When the charging port 105 is connected to the charging pile, the inverter 102 is used to control the opening and closing of the first boost circuit to perform the first boost charging of the battery pack 101, or to control the opening and closing of the second boost circuit to perform the second boost charging of the battery pack 101, wherein the charging power of the first boost charging is less than the charging power of the second boost charging.

[0055] The charging control device provided in this application embodiment uses a motor 103 for driving the vehicle forward, and an inverter 102 for converting the DC power supplied by the battery into AC power required to drive the motor 103. During vehicle charging, the vehicle is stationary, and the motor 103 and inverter 102 do not need to operate. This application embodiment connects the first coil 1041 of the distribution box 104 between the output terminal of the inverter 102 and the charging port 105, forming a first boost charging circuit consisting of the battery pack 101, inverter 102, distribution box 104, and charging port 105. When the charging port 105 receives current from the charging pile, the inverter 102 controls the opening and closing of the first boost circuit, achieving first boost charging of the battery pack 101 with a relatively small charging power.

[0056] Exemplarily, the inverter 102 controls the loop conduction of the charging port 105 and the first coil 1041, the charging pile positive current does not pass through the battery pack 101, but returns to the charging pile negative through the inverter 102 and the first coil 1041, the inverter 102 controls the loop conduction of the charging port 105, the first coil 1041 and the battery pack 101, the battery pack 101 is connected with the charging pile, the voltage of the charging pile is loaded on the battery pack 101, at the same time, due to the impedance increase of the load in the loop, the current on the first coil 1041 begins to decrease, in order to prevent the decrease of the current, the first coil 1041 generates an induced electromotive force superimposed with the voltage output by the charging pile, so that the voltage loaded on the battery pack 101 is increased.

[0057] The embodiment of the application can further form a second voltage boosting charging loop by connecting the first coil 1041 of the distribution box 104 between the output end of the inverter 102 and the charging port 105, and the battery pack 101, the inverter 102, the motor 103, the distribution box 104 and the charging port 105, when the current of the charging pile is connected to the charging port 105, the second voltage boosting circuit is controlled by the inverter 102 to be opened and closed, so as to realize the second voltage boosting charging of the battery pack 101 with a larger charging power.

[0058] Exemplarily, the inverter 102 controls the loop conduction of the charging port 105 and the first coil 1041, the charging pile positive current does not pass through the battery pack 101, but returns to the charging pile negative through the inverter 102 and the first coil 1041, the inverter 102 controls the loop conduction of the charging port 105, the first coil 1041 and the battery pack 101, the battery pack 101 is connected with the charging pile, the voltage of the charging pile is loaded on the battery pack 101, at the same time, due to the impedance increase of the load in the loop, the current on the first coil 1041 begins to decrease, in order to prevent the decrease of the current, the first coil 1041 generates an induced electromotive force superimposed with the voltage output by the charging pile, so that the voltage loaded on the battery pack 101 is increased.

[0059] In summary, the charging control device provided by the embodiments of the present application can realize step-up charging by connecting the power distribution box 104 between the motor 103 and the charging port 105, without the need to replace the electric drive assembly, and therefore has low cost and strong universality. The scheme of the present application can perform step-up charging in two modes of low power and high power. When the battery state of the vehicle or the charging pile state does not support high-power step-up charging, the battery pack 101 can be step-up charged at low power only by the first winding of the power distribution box 104. When the battery state of the vehicle or the charging pile state supports high-power step-up charging, or the vehicle needs to be fast charged to save time, the battery pack 101 can be step-up charged at high power by the first winding of the power distribution box 104 and the stator winding 1031 of the motor 103 itself, and therefore, the scheme has strong universality.

[0060] In some optional embodiments, as shown in Figure 3 The inverter 102 includes the first inverter bridge 1021, the second inverter bridge 1022, and the third inverter bridge 1023 in parallel, the upper bridge arm of the first inverter bridge 1021, the upper bridge arm of the second inverter bridge 1022, and the upper bridge arm of the third inverter bridge 1023 are connected with the positive port of the inverter 102 respectively; the lower bridge arm of the first inverter bridge 1021, the lower bridge arm of the second inverter bridge 1022, and the lower bridge arm of the third inverter bridge 1023 are connected with the negative port of the inverter 102 respectively; the output end of the first inverter bridge 1021 is connected with the output port of the inverter 102, for controlling the first step-up circuit to be switched on or off; the output end of the second inverter bridge 1022 and the output end of the third inverter bridge 1023 are connected with the output port of the inverter 102, for controlling the second step-up circuit to be switched on or off.

[0061] Still as Figure 3 Corresponding to the three parallel inverter bridges of the inverter 102, namely the first inverter bridge 1021, the second inverter bridge 1022, and the third inverter bridge 1023, the stator winding 1031 of the motor 103 includes the first winding coil 301, the second winding coil 302, and the third winding coil 303 connected in a corner shape, the connection point of the first winding coil 301 and the second winding coil 302 is connected with the output end of the first inverter bridge 1021 and the first end of the first coil 1041, the connection point of the second winding coil 302 and the third winding coil 303 is connected with the output end of the second inverter bridge 1022, and the connection point of the third winding coil 303 and the first winding coil 301 is connected with the output end of the third inverter bridge 1023.

[0062] After the charging port 105 is connected with the charging pile, the vehicle controller and the charging pile will establish a communication connection, and receive the charging pile parameters sent by the charging pile. The charging pile parameters include the output voltage of the charging pile. As the "brain" of the vehicle, the vehicle controller will also obtain the battery pack 101 parameters through various sensors on the vehicle, including the battery pack 101 parameters such as the battery pack 101 power, temperature, charging voltage, etc. When it is determined to boost charge the vehicle, the vehicle controller determines the target charging power of the battery pack 101 according to the battery pack 101 parameters and the charging pile parameters.

[0063] For example, when the charging port 105 accesses the current of the charging pile, if the target charging power is less than the preset power threshold, it proves that slow charging is needed, that is, low-power slow charging. At this time, the first boost circuit is opened or closed by controlling the opening and closing of the lower bridge arm of the first inverter bridge 1021 to perform the first boost charging of the battery pack 101. The specific operation is as follows:

[0064] The lower bridge arm of the first inverter bridge 1021 is closed, and the positive current of the charging pile does not pass through the battery pack 101, but passes through the lower bridge arm of the first inverter bridge 1021 and the first coil 1041 to return to the negative of the charging pile. When the lower bridge arm of the first inverter bridge 1021 is switched from the closed state to the open state, the battery pack 101 is connected with the charging pile, the impedance of the load in the first boost circuit increases, and the current on the first coil 1041 begins to decrease. In order to prevent the decrease of the current, the first coil 1041 generates an induced electromotive force superimposed on the voltage output by the charging pile, so that the voltage loaded on the battery pack 101 is increased and the battery pack 101 is boosted charged at a relatively slow speed.

[0065] In this way, by controlling the duty cycle of the electronic switch on the lower bridge arm of the first inverter bridge 1021, the opening and closing frequency of the lower bridge arm of the first inverter bridge 1021 can be controlled, and the charging voltage loaded on the battery pack 101 can be stabilized at the required high voltage value, thereby realizing the boost charging of the battery.

[0066] For another example, when the charging port 105 accesses the current of the charging pile, if the target charging power is greater than or equal to the preset power threshold, it proves that fast charging is needed, that is, high-power fast charging. At this time, the second boost circuit is opened or closed by controlling the opening and closing of the lower bridge arm of the second inverter bridge 1022 or the third inverter bridge 1023 to perform the second boost charging of the battery pack 101. The specific operation is as follows:

[0067] The control of the second inverter bridge 1022 or the third inverter bridge 1023 of the lower bridge arm is closed, and the charging pile positive current does not pass through the battery pack 101, but passes through the lower bridge arm of the second inverter bridge 1022 or the third inverter bridge 1023, the first coil 1041, the stator winding 1031, and the stator winding 1031 back to the charging pile negative. When the lower bridge arm of the second inverter bridge 1022 or the third inverter bridge 1023 is switched from the closed state to the open state, the battery pack 101 is connected to the charging pile, the impedance of the load in the first boost circuit increases, and the current on the first coil 1041 and the stator winding 1031 begins to decrease. In order to prevent the decrease of the current, the induced electromotive force generated by the first coil 1041 and the stator winding 1031 is superimposed on the voltage output by the charging pile, so that the voltage loaded on the battery pack 101 is increased and the battery pack 101 is boosted and charged at a relatively fast speed.

[0068] In this way, by controlling the duty cycle of the electronic switch on the lower bridge arm of the second inverter bridge 1022 or the third inverter bridge 1023, the opening and closing frequency of the lower bridge arm of the second inverter bridge 1022 or the third inverter bridge 1023 can be controlled, and the charging voltage loaded on the battery pack 101 can be stabilized at the required high voltage value, thereby achieving the purpose of boosting the battery.

[0069] It can be understood that in the fast charging mode, the second inverter bridge 1022 and the third inverter bridge 1023 can be controlled separately or simultaneously. Regardless of the choice, the purpose of boosting the battery pack 101 through the stator winding 1031 and the first coil 1041 can be achieved, and this is not limited here.

[0070] During the boosting charging process, current ripple is inevitably generated. Since the inductance of the first coil 1041 used by the power distribution box 104 is limited, when the maximum charging power requested by the vehicle controller exceeds the maximum charging power limit provided by the power distribution box 104, the stator winding 1031 and the first coil 1041 of the motor 103 are used for boosting control. In order to reduce the charging loop ripple current, the following measures are taken: first, obtain the rotor position information of the motor 103, and use the second inverter bridge 1022 or the third inverter bridge 1023 to control the opening and closing of the boost circuit according to the minimum torque principle and the test calibration data, so that the power distribution box 104 and the stator winding 1031 of the motor 103 together constitute a BOOST boost circuit to provide greater charging power for the battery pack 101.

[0071] In summary, the charging control method provided by the embodiments of the present application, by adding the power distribution box 104 and without changing the connection scheme of the original motor 103 and the inverter 102, realizes the step-up charging of the vehicle battery pack 101 in the slow charging and fast charging modes without reducing the function of the motor 103. For the current mass-produced vehicle models, the step-up charging function can be upgraded without replacing the electric drive assembly, and the cost is low.

[0072] In some optional embodiments, as shown in Figure 3 , 4 The power distribution box 104 further includes a first capacitor 304. A first end of the first capacitor 304 is connected with a second end of the first coil 1041 and a positive electrode of the charging port 105. A second end of the first capacitor 304 is connected with a negative electrode of the battery pack 101 and a negative electrode of the charging port 105. When it is detected that the voltage of the first capacitor 304 is less than a preset target voltage, the inverter 102 is configured to control the charging circuit composed of the battery pack 101, the first coil 1041 and the first capacitor 304 to be closed, so that the battery pack 101 charges the first capacitor 304. When it is detected that the voltage of the first capacitor 304 is equal to the preset target voltage, the inverter 102 is configured to control the charging circuit to be disconnected. The target voltage is less than the output voltage of the charging pile.

[0073] When the charging port 105 of the vehicle is connected with the charging pile, the charging pile detects the voltage of the battery pack 101 of the vehicle. If the detected voltage of the battery pack 101 is lower than the output voltage of the charging pile, the power supply loop of the charging pile is turned on to output current to the vehicle. If the voltage of the battery pack 101 is higher than the output voltage of the charging pile, the power supply loop of the charging pile is not turned on. At this time, the first capacitor 304 is discharged by the battery pack 101, so that the voltage of the first capacitor 304 reaches the target voltage which is less than the output voltage of the charging pile. The charging pile detects the voltage of the first capacitor 304, and takes the voltage of the first capacitor 304 as the voltage of the battery pack 101 to compare with the output voltage of the charging pile, so as to turn on the power supply loop of the charging pile. After the power supply loop of the charging pile is turned on, the charging current can be output to the vehicle, and the vehicle receives the charging current output by the charging pile through the charging port 105 to charge the battery pack 101.

[0074] In some optional embodiments, as shown in Figure 4 The power distribution box 104 further includes a bleeder resistor 401 and a bleeder switch 402. The bleeder resistor 401 and the bleeder switch 402 are connected in series between the first end of the first capacitor 304 and the second end of the first capacitor 304 to form a discharging circuit. The bleeder switch 402 is configured to control the discharging circuit to be turned on to release the electric quantity of the first capacitor 304 when it is detected that the battery pack 101 reaches a preset charging completion condition.

[0075] After the battery pack 101 is fully charged, the electricity of the first capacitor 304 is released through the bleeder resistor 401 to avoid affecting the operation of the motor 103 when the vehicle is running.

[0076] In some optional embodiments, as shown in Figure 4 , the power distribution box 104 further comprises a voltage sensor 403 for detecting the voltage of the first capacitor 304. The vehicle controller sends a message to the motor controller, and the motor controller parses the instruction to charge the first capacitor 304 and the value of the target voltage from the message. The motor controller controls the switch on the discharge circuit composed of the first capacitor 304 and the battery pack 101 to be closed, and the battery pack 101 discharges the first capacitor 304. The motor controller receives the real-time voltage of the first capacitor 304 sent by the voltage sensor 403, and when the real-time voltage of the first capacitor 304 is the same as the target voltage, the discharge circuit is disconnected to keep the voltage of the capacitor at the target voltage for the charging pile to detect.

[0077] In some optional embodiments, as shown in Figure 4 , the power distribution box 104 further comprises a fuse 404 arranged between the positive electrode of the charging port 105 and the first capacitor 304 and the first coil 1041, for preventing damage caused by circuit overload and short circuit. It melts itself when the current exceeds a predetermined value, thereby cutting off the circuit to protect electrical equipment and lines from damage.

[0078] As can be understood, as shown in Figure 3 , 4 , the power distribution box 104 further comprises a switch S5 arranged between the positive electrode of the first capacitor 304 and the positive electrode of the charging port 105, a switch S6 arranged between the negative electrode of the first capacitor 304 and the negative electrode of the charging port 105, and a switch S7 arranged between the first end of the first coil 1041 and the stator winding 1031 and the output end of the inverter 102. After the battery pack 101 is fully charged, the switches S5, S6 and S7 are closed to completely disconnect the connection between the power distribution box 104 and the motor 103, the inverter 102 and the battery pack 101, so as to avoid the power distribution box 104 affecting the functions of the motor 103, the inverter 102 and the battery pack 101.

[0079] In some optional embodiments, the positive electrode of the charging port 105 is connected to the positive electrode of the battery pack 101, and the device further comprises a first on-off mechanism arranged between the positive electrode of the charging port 105 and the positive electrode of the battery pack 101, and a second on-off mechanism arranged between the negative electrode of the charging port 105 and the negative electrode of the battery pack 101; when the charging port 105 accesses the current of the charging pile, the first on-off mechanism and the second on-off mechanism are used to control the direct current charging circuit composed of the battery pack 101 and the charging port 105 to be conductive, so that the battery pack 101 is charged in direct current.

[0080] As shown, the positive pole of the charging port 105 is connected to the positive pole of the battery pack 101, which means that the positive pole of the charging port 105 is connected to the positive pole port of the inverter 102, i.e. the positive pole of the charging port 105 is connected to the converging end of the upper bridge arm of the inverter 102. If the output voltage of the charging pile is greater than the voltage of the battery pack 101, the battery pack 101 can be directly charged, and at this time, the voltage of the battery pack 101 does not need to be boosted by the power distribution box 104, the motor 103 and the inverter 102. Figure 3 As shown, the first on-off mechanism includes switches S1 and S3, wherein the switch S1 is arranged between the positive pole of the battery pack 101 and the positive pole port of the inverter 102, and the switch S3 is arranged between the positive pole of the charging port 105 and the positive pole port of the inverter 102. The second on-off mechanism includes switches S2 and S4, wherein the switch S2 is arranged between the negative pole of the battery pack 101 and the negative pole port of the inverter 102, and the switch S4 is arranged between the negative pole of the charging port 105 and the negative pole port of the inverter 102.

[0081] Figure 3 The above switches S1 to S7, inverter and discharge switch can be directly controlled by the motor controller of the vehicle. When the above charging control device is applied to the old vehicle, the specific operation is as shown in the following first to sixth steps.

[0082] The first step, in the existing mass production scheme, based on the motor and inverter of the original motor system, a power distribution box is added to construct a charging control device and a boost charging high-voltage loop (including a first boost charging loop for low-power slow charging and a second boost charging loop for high-power fast charging), so that the current flows through the charging control device after passing through the charging pile and enters the battery pack, and the boost charging loop does not affect the original charging loop.

[0083] The second step, in the charging interaction stage, when the vehicle controller detects that the maximum output voltage of the charging pile is greater than the battery voltage, the switches S1, S2, S3 and S4 are closed, and the charging state is that the charging pile directly charges the battery pack. When it is detected that the charging pile voltage is less than the battery pack voltage, the switches S1, S2, S4, S5, S6, S7 are closed to enter the boost charging.

[0084] The third step, boost charging mode selection, when it is detected that the maximum output voltage of the charging pile does not meet the DC charging condition, the vehicle controller issues a switch boost charging mode instruction. The boost charging loop is composed of a power distribution box, an inverter and a stator winding, wherein the inverter and the stator winding are original facilities on the electric drive, and the circuit is reused to save cost. In order to improve the charging power and reduce the ripple current, the power distribution box can select an external LA inductor to be added to the boost charging loop.

[0085] The third step, boost charging mode selection, when it is detected that the maximum output voltage of the charging pile does not meet the DC charging condition, the vehicle controller issues a switch boost charging mode instruction. The boost charging loop is composed of a power distribution box, an inverter and a stator winding, wherein the inverter and the stator winding are original facilities on the electric drive, and the circuit is reused to save cost. In order to improve the charging power and reduce the ripple current, the power distribution box can select an external LA inductor to be added to the boost charging loop. ​

[0086] Fourth step, in the pre-charge phase, the vehicle is controlled in reverse through the boost charging circuit, realizing the high voltage of the battery pack through the inverter, the stator winding, and the voltage is reduced to the allowable range of the charging pile, charging the first capacitor, so that there is a stable voltage on the circuit.

[0087] Fifth step, in the boost charging phase, after the vehicle controller interacts with the charging pile, it enters the boost charging state. The current output by the charging pile flows through the distribution box, the stator winding, and realizes the BOOST circuit. By changing the switching duty cycle of the inverter, the output voltage is boosted. The specific boost process is shown in the above embodiment, which is not repeated here.

[0088] As shown in Figure 3 The stator winding connection scheme of the motor provided by the embodiment of the application is a delta connection. In the boost charging process, there is a certain degree of current flowing through the three-phase stator. Since the motor used is a permanent magnet synchronous motor, a certain amount of torque will inevitably be generated with the rotor magnetic field. To reduce the torque generated during boost charging, the control scheme is as follows:

[0089] The mass production electric drive stator scheme is a delta connection design. In the charging process, charging current flows through the three-phase stator. The inverter has three bridge arm circuits. Due to the structural characteristics of the delta-connected stator, each bridge arm is connected to two-phase stators at the same time. This scheme can select any one of the bridge arms in the inverter as the switching circuit in the boost circuit.

[0090] Due to the structural design of this scheme, all three bridge arms of the inverter can be used. Therefore, through bench calibration, the torque generated by each bridge arm at different rotor positions is obtained. In actual control, the actual position of the rotor is used to confirm the bridge arm with the smallest torque, and this bridge arm is used as the switching tube of the boost circuit.

[0091] In addition, due to the use of the external first coil and the delta connection design of the motor stator, when the charging power is less than a certain value, the first coil is connected to the first boost circuit, and no current flows through the stator winding, so no torque is generated. In the boost fast charging mode, the charging torque control scheme flow is to confirm the rotor position, confirm the minimum torque circuit by looking up the table, and control the circuit bridge arm to charge the battery pack.

[0092] Sixth step, when the charging current is reduced to 0, switch S5 is opened and switch S7 is closed. When the voltage is less than a certain value, switch S6 and switch S8 are opened.

[0093] Therefore, the charging control device provided by the embodiment of the application can be directly modified and upgraded for existing mass-produced vehicles. Users can determine whether to increase the power distribution box to upgrade the step-up charging function according to the environment in which the vehicle is used, the number and coverage density of 800V or above charging piles in the area where the vehicle is used. The step-up charging device can be used as an optional product for emergency use of low-voltage charging piles to supplement energy. The power distribution box can be externally connected, without affecting the original electric drive assembly of the vehicle, and the cost of upgrading the step-up charging function is low.

[0094] Based on the same inventive concept, the embodiment of the application provides a charging control method applied to the charging control device provided by the above embodiment, as shown in the method includes: Figure 5

[0095] S501, obtaining battery pack parameters and charging pile parameters;

[0096] S502, determining a target charging power for step-up charging of the battery pack according to the battery pack parameters and the charging pile parameters;

[0097] S503, when the current of the charging pile is connected to the charging port, if the target charging power is less than a preset power threshold, controlling the first step-up circuit to be switched on or off to perform first step-up charging of the battery pack;

[0098] S504, if the target charging power is greater than or equal to the preset power threshold, controlling the second step-up circuit to be switched on or off to perform second step-up charging of the battery pack, wherein the charging power of the first step-up charging is less than the charging power of the second step-up charging.

[0099] The method provided by the embodiment of the application comprises the following steps: the first coil of the power distribution box is connected between the output end of the inverter and the charging port, a first step-up charging loop is formed by the battery pack, the inverter, the power distribution box and the charging port, when the current of the charging pile is connected to the charging port, the first step-up circuit is controlled by the inverter to be switched on or off, and first step-up charging of the battery pack is realized at a smaller charging power. A second step-up charging loop is formed by the battery pack, the inverter, the motor, the power distribution box and the charging port, when the current of the charging pile is connected to the charging port, the second step-up circuit is controlled by the inverter to be switched on or off, and second step-up charging of the battery pack is realized at a larger charging power.

[0100] In some optional embodiments, as shown in the method further includes the following steps after the battery pack parameters and the charging pile parameters are obtained: Figure 6

[0101] S601, determining a charging type for charging of the battery pack according to the battery pack parameters and the charging pile parameters, the charging type including step-up charging and direct current charging;

[0102] ​​S602, if it is determined that the charging type is boost charging, performing a step of determining a target charging power for boost charging of the battery pack according to the battery pack parameters and the charging pile parameters.

[0103] In some optional embodiments, as shown in Figure 6 , the method further comprises:

[0104] S603, if it is determined that the charging type is direct current charging, determining a target charging power for direct current charging of the battery pack according to the battery pack parameters and the charging pile parameters, and controlling a direct current charging loop formed by the battery pack and the charging port to be conducted to charge the battery pack with direct current.

[0105] Based on the same inventive concept, as shown in Figure 7 , the embodiments of the present application also provide a vehicle 700 comprising the charging control device 100 provided by the above embodiments. The vehicle 700 provided by the embodiments of the present application adopts the charging control device 100, connects the first coil between the output end of the inverter and the charging port, and forms a first boost charging loop with the battery pack, the inverter, the power distribution box and the charging port. When the charging port is connected to the current of the charging pile, the first boost circuit is controlled to be opened or closed to charge the battery pack with a first boost charging power, or the second boost circuit is controlled to be opened or closed to charge the battery pack with a second boost charging power. This method can realize boost charging of the battery pack of the vehicle 700 by adding the power distribution box. For the current vehicle model that has been mass-produced, the boost charging function can be upgraded without replacing the electric drive assembly, and the cost is low.

[0106] Further, as shown in Figure 8 , the vehicle 700 provided by the embodiments of the present application further comprises a memory 801, a processor 802, and a computer program 803 stored in the memory 801 and executable on the processor 802. When the processor 802 executes the computer program 803, the vehicle 700 performs the method of S501-S504 and S601-S603 provided by the above embodiments.

[0107] The embodiments of the present application also provide a computer readable storage medium, which stores a computer program. When the computer program is executed by a computer, the computer performs the method provided by the above embodiments.

[0108] The embodiments of the present application also provide a computer program product, which comprises a computer program. When the computer program is executed, the computer performs the method provided by the above embodiments.

[0109] Those skilled in the art can understand that all or part of the steps of the above-mentioned method embodiments can be completed by program instruction related hardware. The foregoing program can be stored in a computer readable storage medium. The program executes the steps of the above-mentioned method embodiments when executed; and the foregoing storage medium includes various storage media that can store program codes, such as ROM, RAM, magnetic disk or optical disk.

[0110] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

[0111] In the specification provided herein, a large number of specific details are described. However, it can be understood that the embodiments of the present application can be practiced without these specific details. In some examples, well-known methods, structures and techniques are not shown in detail in order not to obscure the understanding of the present specification.

Claims

1. A charging control device, characterized in that, The application relates to a battery pack, an inverter, a motor, a distribution box and a charging port. The battery pack comprises a positive electrode and a negative electrode. The inverter comprises a positive electrode port, a negative electrode port and an output port, the positive electrode port is connected with the positive electrode of the battery pack, and the negative electrode port is connected with the negative electrode of the battery pack. The motor comprises a stator winding, and the stator winding is connected with the output port of the inverter. The distribution box comprises a first coil, and a first end of the first coil is connected with the output port of the inverter and the stator winding. The charging port comprises a positive electrode and a negative electrode, the positive electrode of the charging port is connected with a second end of the first coil, and the negative electrode of the charging port is connected with the negative electrode port of the inverter and the negative electrode of the battery pack; wherein the battery pack, the inverter, the distribution box and the charging port form a first voltage-boosting charging circuit, and the battery pack, the inverter, the motor, the distribution box and the charging port form a second voltage-boosting charging circuit. When the charging port is connected with the current of a charging pile, the inverter is used for controlling the first voltage-boosting charging circuit to be opened or closed to perform first voltage-boosting charging on the battery pack, or controlling the second voltage-boosting charging circuit to be opened or closed to perform second voltage-boosting charging on the battery pack, wherein the charging power of the first voltage-boosting charging is smaller than the charging power of the second voltage-boosting charging. The inverter comprises a first inverter bridge, a second inverter bridge and a third inverter bridge in parallel, the upper bridge arm of the first inverter bridge, the upper bridge arm of the second inverter bridge and the upper bridge arm of the third inverter bridge are connected with the positive electrode port of the inverter respectively, the lower bridge arm of the first inverter bridge, the lower bridge arm of the second inverter bridge and the lower bridge arm of the third inverter bridge are connected with the negative electrode port of the inverter respectively, the output end of the first inverter bridge is connected with the output port of the inverter, and is used for controlling the first voltage-boosting charging circuit to be opened or closed, and the output end of the second inverter bridge and the output end of the third inverter bridge are connected with the output port of the inverter, and are used for controlling the second voltage-boosting charging circuit to be opened or closed.

2. The charge control device according to claim 1, wherein The stator winding comprises a first winding coil, a second winding coil and a third winding coil connected in an angle shape, the connection point of the first winding coil and the second winding coil is connected with the output end of the first inverter bridge and the first end of the first coil, the connection point of the second winding coil and the third winding coil is connected with the output end of the second inverter bridge, and the connection point of the third winding coil and the first winding coil is connected with the output end of the third inverter bridge.

3. The charge control device according to claim 2, wherein ​ 4. The charge control device according to claim 1, wherein The power distribution box further comprises a first capacitor; a first end of the first capacitor is connected with a second end of the first coil and a positive electrode of the charging port; a second end of the first capacitor is connected with a negative electrode of the battery pack and a negative electrode of the charging port; when detecting that a voltage of the first capacitor is less than a preset target voltage, the inverter is configured to control a charging circuit formed by the battery pack, the first coil and the first capacitor to be closed, so as to charge the first capacitor by the battery pack; when detecting that the voltage of the first capacitor is equal to the preset target voltage, the inverter is configured to control the charging circuit to be disconnected, wherein the target voltage is less than an output voltage of the charging pile.

5. The charge control device according to claim 4, wherein The power distribution box further comprises a discharge resistor and a discharge switch; the discharge resistor and the discharge switch are connected in series between the first end of the first capacitor and the second end of the first capacitor to form a discharge circuit; the discharge switch is configured to control the discharge circuit to be turned on to release the electric quantity of the first capacitor when detecting that the battery pack reaches a preset charging completion condition.

6. The charge control device according to claim 1, wherein The positive electrode of the charging port is connected with the positive electrode of the battery pack; the device further comprises a first on-off mechanism arranged between the positive electrode of the charging port and the positive electrode of the battery pack, and a second on-off mechanism arranged between the negative electrode of the charging port and the negative electrode of the battery pack; when the charging port accesses the current of the charging pile, the first on-off mechanism and the second on-off mechanism are configured to control a direct current charging circuit formed by the battery pack and the charging port to be turned on, so as to charge the battery pack in direct current.

7. A charge control method characterized by, The method is applied to the charging control device of any one of claims 1 to 6, and the method comprises: obtaining battery pack parameters and charging pile parameters; determining a target charging power for boosting charging the battery pack according to the battery pack parameters and the charging pile parameters; when the charging port accesses the current of the charging pile, if the target charging power is less than a preset power threshold, controlling the first boosting charging circuit to be turned on and off, so as to boost charge the battery pack; if the target charging power is greater than or equal to the preset power threshold, controlling the second boosting charging circuit to be turned on and off, so as to boost charge the battery pack, wherein the charging power of the first boosting charging is less than the charging power of the second boosting charging.

8. The charge control method according to claim 7, wherein After obtaining the battery pack parameters and the charging pile parameters, the method further comprises: determining a charging type for charging the battery pack according to the battery pack parameters and the charging pile parameters, wherein the charging type comprises boosting charging and direct current charging; if it is determined that the charging type is boosting charging, performing the step of determining the target charging power for boosting charging the battery pack according to the battery pack parameters and the charging pile parameters.

9. The charge control method according to claim 8, wherein if it is determined that the charging type is direct current charging, determining a target charging power for direct current charging the battery pack according to the battery pack parameters and the charging pile parameters, and controlling a direct current charging circuit formed by the battery pack and the charging port to be turned on, so as to direct current charge the battery pack.

10. A vehicle characterized by comprising: The charging control device of any one of claims 1 to 6. The charging control device of any one of claims 1 to 6.

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