Battery system and charging and discharging control method of battery system

Abstract

The present application discloses a battery system and a charge and discharge control method of the battery system. The battery system includes: a vehicle controller, an on-board charger and an AC / DC conversion component; the vehicle controller is connected to the AC / DC conversion component and the range-extending battery, and is connected to the on-board charger, and is used to control the charge and discharge of the range-extending battery according to the required driving power of the vehicle's driving mechanism, the charging efficiency corresponding to the on-board charger, and the discharge efficiency corresponding to the AC / DC conversion component; the on-board charger is connected to the AC / DC conversion component, and is used to convert the AC power output by the AC / DC conversion component into DC power, and to supply power to the driving mechanism; the AC / DC conversion component is connected to the range-extending battery, and is used to convert the DC power output by the range-extending battery into AC power. The solution provided by this application can improve the power utilization rate of the range-extending battery, and provide a basis for increasing the vehicle's cruising range.

Description

Technical Field

[0001] The present application relates to the field of battery management technology, and in particular to a battery system and a charge and discharge control method of the battery system. Background Art

[0002] In the related art, in order to improve the cruising range of a vehicle, it is usually achieved by adding a range-extending battery. Therefore, improving the power utilization rate of the range-extending battery is of great significance to improving the cruising range of the vehicle. Summary of the invention

[0003] The present application provides a battery system and a charge and discharge control method of the battery system, which can improve the power utilization rate of the range-extended battery and provide a basis for increasing the vehicle's cruising range.

[0004] In the first aspect, the present application provides a battery system, which includes: a vehicle controller, an on-board charger and an AC / DC conversion component; the vehicle controller is connected to the AC / DC conversion component and the extended-range battery, and is connected to the on-board charger, and is used to control the charging and discharging of the extended-range battery according to the required driving power of the vehicle's driving mechanism, the corresponding charging efficiency of the on-board charger, and the corresponding discharge efficiency of the AC / DC conversion component; the on-board charger is connected to the AC / DC conversion component, and is used to convert the AC power converted and output by the AC / DC conversion component into DC power, and supply power to the driving mechanism; the AC / DC conversion component is connected to the extended-range battery, and is used to convert the DC power output by the extended-range battery into AC power.

[0005] In the power range with higher charging and discharging efficiency, the charging and discharging efficiency of the range-extended battery is higher, and its corresponding electric energy utilization rate is also higher. In this application, the charging and discharging of the range-extended battery requires the participation of the AC / DC conversion component and the on-board charger, and the charging and discharging efficiency of the AC / DC conversion component and the on-board charger will also affect the charging and discharging efficiency of the range-extended battery. Therefore, in this application, the discharge power range of the range-extended battery is determined by the discharge efficiency of the AC / DC conversion component and the charging efficiency of the on-board charger. In this discharge power range, the AC / DC conversion component and the on-board charger operate in a higher efficiency range, so that the range-extended battery also has a higher discharge efficiency, thereby improving the electric energy utilization rate of the range-extended battery.

[0006] It can be seen that the solution provided in this application can improve the energy utilization rate of the extended-range battery and provide a basis for increasing the vehicle's cruising range.

[0007] In some embodiments, the AC power converted by the AC / DC conversion component is single-phase AC power or three-phase AC power, realizing the AC connection between the extended-range battery and the entire vehicle, so that it can be adapted to vehicles with different types of AC interfaces.

[0008] In some embodiments, the AC / DC conversion component includes a first DC interface, a first AC interface and a first conversion component; the first DC interface is connected to the extended-range battery; the first AC interface is connected to the second AC interface of the vehicle charger; and the first conversion component is connected between the first DC interface and the first AC interface.

[0009] The DC power output by the range-extended battery is converted into AC power through an AC-DC conversion component, and the AC power output by the on-board charger is converted into AC-DC power to achieve AC connection between the range-extended battery and the entire vehicle, thereby increasing the cruising range of electric vehicles with an AC interface.

[0010] In some embodiments, the vehicle-mounted charger includes a second AC interface, a second DC interface and a second conversion component; the second AC interface is connected to the AC charging device through the AC charging interface and is connected to the extended-range battery; the second DC interface is connected to the DC charging device through the DC charging interface and is connected to the power battery and the vehicle-mounted high-voltage equipment; the second conversion component is connected between the second AC interface and the first DC interface.

[0011] By setting up an on-board charger to connect the entire vehicle with the extended-range battery, the on-board charger can use the extended-range battery to provide power to the power battery, thereby increasing the vehicle's range. At the same time, it can also realize the transmission of AC power between the extended-range battery and the entire vehicle, thereby improving the flexibility of vehicle charging and discharging.

[0012] In some embodiments, the battery system also includes: a DC conversion component, connected to the second DC interface and the vehicle controller, for converting the DC power output by the on-board charger to supply power to the vehicle controller; a low-voltage power distribution system, connected to the DC conversion component, for supplying power to the vehicle's on-board low-voltage equipment.

[0013] By setting up a DC conversion component and a low-voltage power distribution system, power can be supplied to the vehicle's onboard low-voltage equipment after the vehicle is powered on at low voltage.

[0014] In some embodiments, the battery system also includes: a motor controller; the first end of the motor controller is connected to the driving mechanism, the second end of the motor controller is connected to the vehicle charger and the DC charging device, and the control end of the motor controller is connected to the signal output end of the vehicle controller; the motor controller is used to control the operation of the driving mechanism according to the output signal of the vehicle controller.

[0015] By setting up a motor controller and communicating with the vehicle controller, the vehicle controller can determine the strategy for providing electrical energy to the drive mechanism based on the driving power required by the drive mechanism and the power, output power and power efficiency of the power battery and range-extended battery, so as to improve the utilization rate of electrical energy and reduce energy waste while ensuring the normal operation of the drive mechanism.

[0016] In some embodiments, the vehicle controller is connected to the on-board charger and the range-extended battery via the vehicle controller local area network bus CAN, thereby eliminating the need to set up an additional bus for the range-extended battery and reducing costs.

[0017] In some embodiments, the vehicle controller is connected to the on-board charger via the vehicle controller local area network bus CAN, and is connected to the extended-range battery via the extended-range CAN.

[0018] The extended-range battery and the on-board charger use different buses to connect to the vehicle controller, which reduces the complexity of data transmission using the same bus, thereby reducing the risk of data mistransmission and omission, and improving the stability and reliability of data transmission.

[0019] In some embodiments, the vehicle controller is used to drive the power control of the extended-range battery to charge and discharge within a target discharge power range according to the demand of the vehicle's driving mechanism, wherein the target discharge power range is a power range determined by the charging efficiency corresponding to the on-board charger and the discharge efficiency corresponding to the AC / DC conversion component.

[0020] The discharge power range of the extended-range battery is determined by the discharge efficiency of the AC / DC conversion component and the charging efficiency of the on-board charger. Within this discharge power range, the AC / DC conversion component and the on-board charger operate in a higher efficiency range, so that the extended-range battery also has a higher discharge efficiency, thereby improving the energy utilization rate of the extended-range battery.

[0021] In some embodiments, the vehicle controller is also used to obtain first charging efficiency data corresponding to the on-board charger and second discharge efficiency data corresponding to the AC / DC conversion component, and determine the discharge power range corresponding to the extended-range battery based on the first charging efficiency data and the second discharge efficiency data.

[0022] The discharge power range of the extended-range battery is determined by the discharge efficiency of the AC / DC conversion component and the charging efficiency of the on-board charger, so that the extended-range battery is discharged within a higher efficiency discharge power range, thereby improving the discharge efficiency of the extended-range battery.

[0023] In some embodiments, the vehicle controller is also used to calculate the product of the first charging efficiency data and the second discharge efficiency data to obtain an initial discharge efficiency range corresponding to the extended-range battery; determine a discharge efficiency range in which the discharge efficiency of the extended-range battery is higher than a preset discharge efficiency from the initial discharge efficiency range; and determine a discharge power range corresponding to the discharge efficiency range based on a preset correlation between discharge efficiency and discharge power.

[0024] The discharge power range of the extended-range battery is determined by the first charging efficiency data corresponding to the on-board charger and the second discharge efficiency data corresponding to the AC / DC conversion component. Within the discharge power range, the AC / DC conversion component and the on-board charger operate in a higher efficiency range, so that the extended-range battery also has a higher discharge efficiency, thereby improving the energy utilization rate of the extended-range battery.

[0025] In some embodiments, the vehicle controller is also used to determine the target output power of the extended-range battery in the following manner: when the required driving power is less than the first discharge power, the target output power of the extended-range battery is determined to be 0, and the power battery is controlled to provide the required driving power for the drive mechanism, wherein the first discharge power is the lower limit of the discharge power in the discharge power interval; when the required driving power is greater than or equal to the first discharge power and less than or equal to the second discharge power, the target output power of the extended-range battery is determined to be the required driving power, and the extended-range battery is controlled to provide the required driving power for the drive mechanism with the target output power, wherein the second discharge power is the upper limit of the discharge power in the discharge power interval; when the required driving power is greater than the second discharge power, the target output power of the extended-range battery is determined to be the second discharge power, and the extended-range battery and the power battery are controlled to simultaneously provide the required driving power for the drive mechanism, wherein the sum of the target output power provided by the extended-range battery and the output power provided by the power battery is the required driving power.

[0026] Allowing the range-extended battery to discharge within a discharge power range with higher discharge efficiency can improve the discharge efficiency of the range-extended battery, thereby improving the electric energy utilization rate of the range-extended battery.

[0027] In some embodiments, the vehicle controller is also used to obtain the maximum output power of the charging device and the charging device type of the charging device when the battery system is in a charging state; based on the maximum output power of the charging device and the charging strategy corresponding to the charging device type, determine the target charging power of the charging device for charging the extended-range battery.

[0028] Different charging strategies are used to charge the extended-range battery according to the type of charging equipment to improve the charging efficiency of the extended-range battery. Moreover, during the charging process, the maximum output power of the charging equipment is also taken into account, so that when the conditions are met, the maximum output power of the charging equipment can be used to charge the extended-range battery, which can further improve the charging efficiency of the extended-range battery.

[0029] In some embodiments, when the charging device is a DC charging device, the vehicle controller determines the target charging power of the charging device for charging the extended-range battery in the following manner: when the maximum output power of the charging device is less than or equal to the maximum charging power corresponding to the power battery, the target charging power is determined to be 0, and the DC charging device is controlled to charge the power battery; when the maximum output power of the charging device is greater than the maximum charging power corresponding to the power battery, the difference between the maximum output power of the charging device and the maximum charging power corresponding to the power battery is calculated to obtain the charging power difference; based on the charging power difference and the charging power range corresponding to the extended-range battery, the target charging power of the charging device for charging the extended-range battery is determined.

[0030] When the maximum output power of the DC charging equipment cannot meet the charging demand of the power battery, the power battery is charged first to ensure the normal operation of the vehicle; when the maximum output power of the DC charging equipment can meet the charging demand of the power battery, the extended-range battery is charged in combination with the charging power range of the extended-range battery, which can improve the charging efficiency of the extended-range battery.

[0031] In some embodiments, the vehicle controller is also used to determine the target charging power of the charging equipment for charging the extended-range battery in the following manner: when the charging power difference is less than the first charging power, the target charging power is determined to be 0, wherein the first charging power is the lower limit of the charging power in the charging power interval; when the charging power difference is greater than or equal to the first charging power, and less than or equal to the second charging power, the target charging power is determined to be the charging power difference, wherein the second charging power is the upper limit of the charging power in the charging power interval; when the charging power difference is greater than the second charging power, the target charging power is determined to be the second charging power.

[0032] When the maximum output power of the DC charging equipment can meet the charging needs of the power battery, the extended-range battery is charged in combination with the charging power range of the extended-range battery. This not only ensures the safe charging of the extended-range battery, but also improves the charging efficiency of the extended-range battery.

[0033] In some embodiments, the vehicle controller is also used to obtain first discharge efficiency data corresponding to the on-board charger and second charging efficiency data corresponding to the AC / DC conversion component; calculate the product of the first discharge efficiency data and the second charging efficiency data to obtain an initial charging efficiency range corresponding to the extended-range battery; determine a charging efficiency range in which the charging efficiency of the extended-range battery is higher than a preset charging efficiency from the initial charging efficiency range; and determine a charging power range corresponding to the charging efficiency range based on a preset correlation between the charging efficiency and the charging power.

[0034] The charging power range of the extended-range battery is determined by the first discharge efficiency data corresponding to the on-board charger and the second charging efficiency data corresponding to the AC / DC conversion component. Within the charging power range, the AC / DC conversion component and the on-board charger operate in a higher efficiency range, so that the extended-range battery also has a higher charging efficiency, thereby improving the charging efficiency of the extended-range battery.

[0035] In some embodiments, when the charging device is an AC charging device, the vehicle controller determines the target charging power of the charging device for charging the extended-range battery in the following manner: obtain a third charging power and a fourth charging power, wherein the third charging power is the maximum charging power corresponding to the on-board charger, and the fourth charging power is the maximum charging power corresponding to the AC / DC conversion component; when the maximum output power of the charging device is less than the third charging power, determine the target charging power to be 0, and control the on-board charger to charge the power battery with the maximum output power of the charging device; when the maximum output power of the charging device is greater than or equal to the third charging power, and less than or equal to the fifth charging power, determine the target charging power to be a sixth charging power, wherein the fifth charging power is the sum of the third charging power and the fourth charging power, and the sixth charging power is the difference between the maximum output power of the charging device and the third charging power; when the maximum output power of the charging device is greater than the fifth charging power, determine the target charging power to be the fourth charging power.

[0036] When the maximum output power of the AC charging equipment cannot meet the charging demand of the power battery, the power battery is charged first to ensure the normal operation of the vehicle; when the maximum output power of the AC charging equipment can meet the charging demand of the power battery, the maximum charging power that the AC charging equipment can provide is used to charge the extended-range battery to improve the charging efficiency of the extended-range battery.

[0037] In the second aspect, the present application also provides a battery system charge and discharge control method, which is applied to the battery system of the first aspect, and the method includes: obtaining the working status of the battery system; when the battery system is in a discharge state, obtaining the required driving power of the driving mechanism; and controlling the charge and discharge of the extended-range battery according to the required driving power, the charging efficiency corresponding to the on-board charger, and the discharge efficiency corresponding to the AC / DC conversion component.

[0038] In the power range with higher charging and discharging efficiency, the charging and discharging efficiency of the range-extended battery is higher, and its corresponding electric energy utilization rate is also higher. In this application, the discharge power range of the range-extended battery is determined by the discharge efficiency of the AC / DC conversion component and the charging efficiency of the on-board charger. In this discharge power range, the AC / DC conversion component and the on-board charger operate in a higher efficiency range, so that the range-extended battery also has a higher discharge efficiency, thereby improving the electric energy utilization rate of the range-extended battery.

[0039] In a fourth aspect, the present application provides a readable storage medium having computer program instructions stored thereon. When the computer program instructions are executed by a processor, the charge and discharge control method for the battery system as described in the second aspect is implemented.

[0040] In a fifth aspect, the present application provides a computer program product. When the instructions in the computer program product are executed by a processor of an electronic device, the electronic device executes the charge and discharge control method of the battery system as described in the second aspect.

[0041] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0043] Figure 1 This is a schematic diagram of the structure of a battery system according to an embodiment of the present application;

[0044] Figure 2 A schematic diagram of a first connection method between a VCU and an OPACK according to an embodiment of the present application;

[0045] Figure 3 A schematic diagram of a second connection method between a VCU and an OPACK according to an embodiment of the present application;

[0046] Figure 4 A flow chart of a charge and discharge control method for a battery system according to another embodiment of the present application;

[0047] Figure 5 A curve chart corresponding to first charging efficiency data of another embodiment of the present application;

[0048] Figure 6 A curve chart corresponding to the second discharge efficiency data of another embodiment of the present application;

[0049] Figure 7 A curve chart of the initial discharge efficiency range corresponding to the range-extended battery of another embodiment of the present application;

[0050] Figure 8 A flowchart of determining a target output power of a range-extended battery according to another embodiment of the present application;

[0051] Fig. 9 This is a flow chart of a charging method for a range-extended battery according to another embodiment of the present application;

[0052] Fig.10 This is a flow chart of a charging method for a range-extended battery in a DC charging scenario according to another embodiment of the present application;

[0053] Fig.11 This is a flow chart of a charging method for a range-extended battery in a DC charging scenario according to another embodiment of the present application;

[0054] Fig.12 This is a flow chart of a charging method for an extended-range battery in an AC charging scenario according to another embodiment of the present application.

[0055] In the accompanying drawings, the drawings may not be drawn according to the actual scale. The reference numerals in the accompanying drawings are explained as follows:

[0056] VCU-vehicle controller; OBC-on-board charger; H-extended-range battery pack interface; DC / AC-AC / DC conversion component; DC / DC-DC conversion component; PACK-power battery; OPACK-extended-range battery; L1-positive high-voltage line; L3-negative high-voltage line; L2-low-voltage communication line; EVSE / AC-AC charging equipment; EVSE / DC-DC charging equipment; HAVC-heating, ventilation and air conditioning; M-drive mechanism; TN-low-voltage power distribution system; FU-fuse; TA-current sensor; J-relay; MCU-motor controller. DETAILED DESCRIPTION

[0057] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0058] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0059] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0060] Mentioning "embodiment" in the embodiments of the present application means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiment described in the embodiments of the present application can be combined with other embodiments.

[0061] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0062] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0063] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0064] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0065] There are two major pain points in electric vehicles at present: short battery life and slow charging, which are particularly prominent in low temperature environments. With the promotion of supercharging technology, the slow charging of electric vehicles has been significantly improved. In response to the problem of short battery life of electric vehicles, in related technologies, the range of electric vehicles is increased by adding a detachable range-extending package. Specifically, an extended-range battery pack interface is set in the electric vehicle, and the extended-range battery is connected to the power battery through the extended-range battery pack interface. A bidirectional DC converter is set between the extended-range battery and the power battery to realize the conversion of DC voltage / current and the voltage / current required by the extended-range battery or the power battery. At the same time, the charging and discharging of the power battery and the extended-range battery can also be controlled.

[0066] However, in the above scheme, a bidirectional DC converter is used to realize the voltage or current conversion between the range-extending battery and the power battery, which can only be used in the electric vehicle with a DC interface, and cannot be applied to the AC interface. Moreover, in the related art, when controlling the charging and discharging of the range-extending battery, the range-extending battery pack only has a DC output interface, which can only increase the cruising range of the electric vehicle, and the power utilization rate of the range-extending battery is low.

[0067] In response to the problems existing in the related technologies, the present application provides a power supply system, which can realize the AC connection between the range-extending battery and the whole vehicle, that is, the range-extending battery can be connected to the whole vehicle through an AC interface, so that it can be applied to electric vehicles with an AC interface. In addition, in the present application, an extended-range battery pack interface is also provided to connect the range-extending battery to the whole vehicle. The range-extending battery pack interface is led out from the AC side inside the whole vehicle, and the DC power of the range-extending battery is converted into AC power through a bidirectional DC (Direct Current) / AC (Alternating Current) converter.

[0068] In addition, in the present application, the range-extended battery can be arranged in a range-extended pack, which also includes the above-mentioned bidirectional DC / AC converter and ECU (Electronic Control Unit), wherein the ECU integrates the DC / AC controller and the BMS (Battery Management System) of the range-extended battery, and communicates with the VCU (Vehicle Control Unit). The VCU distributes energy between the power battery of the whole vehicle and the range-extended power battery according to different working conditions, so as to efficiently utilize the range-extended battery to increase the cruising range.

[0069] In order to further improve the energy utilization rate of the extended-range battery, the present application also provides a charging and discharging control method, which maximizes the utilization of the power of the extended-range battery by controlling the power output of the DC / AC converter and the OBC (On-Board Charger).

[0070] The following is an introduction to the battery system provided in the embodiments of the present application.

[0071] In one embodiment, Figure 1 The structure diagram of the battery system provided in the embodiment of the present application is shown. Figure 1 It can be seen that in the embodiment of the present application, the battery system at least includes: a vehicle controller VCU, an on-board charger OBC and an AC / DC conversion component DC / AC. In one example, the battery system may also include an extended-range battery pack interface H for realizing an AC connection between the extended-range battery OPACK and the vehicle.

[0072] For the vehicle controller VCU, it can be connected to the DC / AC conversion component DC / AC and the range-extending battery OPACK through the range-extending battery pack interface H, and connected to the on-board charger OBC. Figure 1 In the figure, L1 is a positive high voltage line, L3 is a negative high voltage line, for example, a ground line; L2 is a low voltage communication line. The vehicle controller VCU is connected to the extended-range battery pack interface H through the low voltage communication line L2, and the extended-range battery pack interface H is connected to the AC / DC conversion component DC / AC through the low voltage communication line L2 to transmit control instructions and data between the AC / DC conversion component DC / AC; at the same time, the extended-range battery pack interface H can also be connected to the AC / DC conversion component DC / AC through the positive high voltage line L1 and the low voltage communication line L2 to realize the power transmission between the extended-range battery pack interface H and the AC / DC conversion component DC / AC; the AC / DC conversion component DC / AC can also be connected to the extended-range battery OPACK to realize the discharge of the extended-range battery OPACK to the vehicle system and the charging of the extended-range battery OPACK by the external charging equipment.

[0073] In addition, if Figure 1 As shown, the vehicle controller VCU is also connected to the on-board charger OBC through a low-voltage communication line L2 to control the charging and discharging of the on-board charger OBC.

[0074] In the embodiment of the present application, the vehicle controller VCU can control the charging and discharging of the extended-range battery OPACK according to the required driving power of the vehicle's driving mechanism, the charging efficiency of the on-board charger OBC, and the discharge efficiency of the AC / DC conversion component DC / AC. The vehicle's driving mechanism may include but is not limited to a motor.

[0075] Depend on Figure 1It can be seen that the charging and discharging of the range-extended battery OPACK is inseparable from the on-board charger OBC and the AC / DC conversion component DC / AC. Combining the charging efficiency of the on-board charger OBC and the discharge efficiency of the AC / DC conversion component DC / AC, the optimal discharge power range (i.e., the target discharge power range) of the range-extended battery OPACK can be obtained. Discharging within this discharge power range can improve the energy utilization rate of the range-extended battery OPACK.

[0076] For the on-board charger OBC, Figure 1 As shown, it is connected to the AC / DC conversion component DC / AC through the extended-range battery pack interface H, wherein the on-board charger OBC is connected to the extended-range battery pack interface H through the positive high-voltage line L1 and the negative high-voltage line L3 to realize the power transmission between the on-board charger OBC and the AC / DC conversion component DC / AC.

[0077] In the embodiment of the present application, the on-board charger OBC can convert the AC power output by the DC / AC conversion component into DC power and supply power to the drive mechanism. Figure 1 In the process, when the range-extended battery OPACK is needed to power the vehicle's driving mechanism, the vehicle controller VCU controls the range-extended battery OPACK to discharge, and the AC / DC conversion component DC / AC converts the DC power output by the range-extended battery OPACK into AC power, which is then transmitted to the on-board charger OBC through the range-extended battery pack interface H, so that the on-board charger OBC converts the AC power into DC power to provide power for the vehicle's driving mechanism.

[0078] The AC / DC conversion component DC / AC is connected to the range-extended battery OPACK and can convert the DC power output by the range-extended battery OPACK into AC power, and can also convert the AC power output by the AC charging device into DC power to charge the range-extended battery OPACK.

[0079] As for the extended-range battery pack interface H, it is connected to the extended-range battery OPACK through the AC / DC conversion component DC / AC, and is used to transmit the AC power converted and output by the AC / DC conversion component DC / AC to the on-board charger OBC, so as to realize the discharge of the extended-range battery OPACK. In the embodiment of the present application, the extended-range battery pack interface H can also transmit the DC power converted and output by the AC / DC conversion component DC / AC to the extended-range battery OPACK to realize the DC charging of the extended-range battery OPACK. For example, when the DC charging device charges the vehicle, the on-board charger OBC converts the DC power output by the DC charging device into AC power, and then transmits the AC power to the AC / DC conversion component DC\AC through the extended-range battery pack interface H to convert the AC power into the DC power required by the extended-range battery OPACK, and charge the extended-range battery OPACK.

[0080] Based on the above introduction, it can be known that within the power range of higher charging and discharging efficiency, the charging and discharging efficiency of the range-extended battery is higher, and its corresponding electric energy utilization rate is also higher. In this application, the charging and discharging of the range-extended battery requires the participation of the AC / DC conversion component and the on-board charger, and the charging and discharging efficiency of the AC / DC conversion component and the on-board charger will also affect the charging and discharging efficiency of the range-extended battery. Therefore, in this application, the discharge power range of the range-extended battery is determined by the discharge efficiency of the AC / DC conversion component and the charging efficiency of the on-board charger. Within this discharge power range, the AC / DC conversion component and the on-board charger operate in a higher efficiency range, so that the range-extended battery also has a higher discharge efficiency, thereby improving the electric energy utilization rate of the range-extended battery.

[0081] The following is a further introduction to the various components in the battery system.

[0082] For the extended-range battery pack interface H, it may include a first interface and a second interface, the first interface is used to transmit single-phase AC power, and the second interface is used to transmit three-phase AC power. Among them, the vehicle controller VCU sends an interface switching instruction to the extended-range battery OPACK to switch the extended-range battery pack interface H to the first interface or the second interface that matches the AC interface type of the on-board charger OBC. That is, in the embodiment of the present application, the AC power converted by the AC / DC conversion component DC / AC is single-phase AC power or three-phase AC power.

[0083] In the above embodiment, the AC interface type of the on-board charger OBC is a single-phase AC interface or a three-phase AC interface, wherein the AC interface type of the on-board charger OBC can be set before the vehicle leaves the factory. After the vehicle leaves the factory, the vehicle controller VCU can control the switching of the extended-range battery pack interface H by detecting the AC interface type of the on-board charger OBC.

[0084] In the embodiment of the present application, the range-extended battery pack interface H is consistent with the AC charging interface of the vehicle. If the vehicle is charged with single-phase AC, the range-extended battery pack interface H is also single-phase. If the vehicle is charged with three-phase AC, the range-extended battery pack interface H is also three-phase. That is, in the embodiment of the present application, the AC / DC conversion component DC / AC supports single-phase and three-phase switching, and can output both single-phase 220V AC and three-phase 380V AC. The power level of the AC / DC conversion component DC / AC matches the power level of the on-board charger OBC, including 3.3KW, 6.6kW, 11kW, 22kW and 40kW, etc.

[0085] In addition, in the embodiment of the present application, both the on-board charger OBC and the AC / DC conversion component DC / AC support bidirectional components. For the AC / DC conversion component DC / AC, AC to DC conversion is charging, and vice versa is discharging. For example, the on-board charger OBC transmits the output AC power to the AC / DC conversion component DC / AC, so that the AC / DC conversion component DC / AC converts the AC power into DC power to charge the extended-range battery OPACK; for another example, the extended-range battery OPACK releases DC power, and the AC / DC conversion component DC / AC converts the DC power into AC power and transmits it to the on-board charger OBC, which is discharging for the AC / DC conversion component DC / AC.

[0086] It should be noted that in the embodiment of the present application, the DC side of the high-voltage architecture of the whole vehicle does not change, and the AC connection between the extended-range battery OPACK and the whole vehicle is realized by adding the extended-range battery pack interface H, so that it can be adapted to vehicles with an AC interface.

[0087] In addition, it should be noted that the range-extended battery pack interface H can provide multiple types of AC interfaces, thereby expanding the application scope of the range-extended battery OPACK, so that the range-extended battery OPACK can not only increase the cruising range of the vehicle, but also provide electricity for outdoor and household use.

[0088] As for the AC / DC conversion component DC / AC, it includes a first DC interface, a first AC interface and a first conversion component; wherein the first DC interface is connected to the extended-range battery OPACK; the first AC interface is connected to the second AC interface of the on-board charger OBC through the extended-range battery pack interface H; the first conversion component is connected between the first DC interface and the first AC interface, which can convert the DC power output by the extended-range battery OPACK into AC power, and can also convert the AC power output by the on-board charger OBC or the AC charging equipment EVSE / AC into DC power to charge the extended-range battery OPACK.

[0089] The DC power output by the range-extended battery OPACK is converted to AC through the DC / AC conversion component, and the AC power output by the on-board charger OBC is converted to AC / DC to achieve AC connection between the range-extended battery OPACK and the entire vehicle, thereby increasing the cruising range of electric vehicles with an AC interface.

[0090] The on-board charger OBC includes a second AC interface, a second DC interface and a second conversion component. The second AC interface is connected to the AC charging device through the AC charging interface, and is connected to the extended-range battery OPACK through the extended-range battery pack interface H, wherein the AC charging device can be an AC charging device such as Figure 1The EVSE / AC in the diagram; the second DC interface is connected to the DC charging device through the DC charging interface, and is connected to the power battery PACK and the on-board high-voltage equipment; the second conversion component is connected between the second AC interface and the first DC interface, which can convert the AC power output by the AC charging device EVSE / AC into DC power to power the power battery PACK and other on-board high-voltage equipment (for example, HVAC HAVC); it can also convert the DC power output by the DC charging device EVSE / DC into AC power, and transmit it to the AC / DC conversion component DC / AC through the extended-range battery pack interface H to convert the AC power into DC power to charge the extended-range battery OPACK.

[0091] by Figure 1 For example, after adding the extended-range battery, the extended-range battery OPACK participates in the vehicle driving when driving, and the on-board charger OBC needs to be in working state when driving. Compared with the original working mode, in the embodiment of the present application, the on-board charger OBC adds two new working modes, namely the extended-range package driving mode and the extended-range package charging mode. Among them, the vehicle controller VCU can control the on-board charger OBC to enter the above two modes, without the need for the on-board charger OBC to judge the transmission signal between the charging device and the on-board charger OBC, and only needs to output power according to the power request of the vehicle controller VCU.

[0092] In the above example, the transmission signal between the charging device and the on-board charger OBC may include a charging connection confirmation CC signal and a control guide signal line CP signal, wherein the CC signal is a connection confirmation signal of the on-board charger OBC, and by detecting the voltage of the CC signal, it can be determined whether the charging device is properly plugged in and the connection status; the CP signal is a confirmation signal that the charging gun of the charging device is connected to the charging port of the vehicle, and the maximum allowable current of the charging device can be identified through the CP signal.

[0093] For the extended-range pack driving mode, when the vehicle is in driving state, the vehicle controller VCU can control the on-board charger OBC to enter the extended-range pack driving mode, request the ECU of the extended-range battery OPACK to enter the discharge mode, and request the on-board charger OBC and the extended-range battery OPAKC to output electrical energy according to the power required by the driving mechanism (for example, the motor).

[0094] For the extended-range pack charging mode, when the vehicle is in the charging mode, the vehicle controller VCU can control the on-board charger OBC to enter the extended-range pack charging mode, request the ECU of the extended-range battery OPACK to enter the discharge mode, and discharge the extended-range battery OPACK through the on-board charger OBC according to the maximum power of the DC charging device or the AC charging device and / or the maximum charging power allowed by the power battery PACK.

[0095] In addition, when the vehicle is powered on at low voltage (i.e. not at high voltage) or the range-extended battery OPACK is low on power, the vehicle controller VCU can control the on-board charger OBC and the ECU of the range-extended battery OPACK to enter standby mode.

[0096] Corresponding to the working mode of the on-board charger OBC, the ECU of the range-extended battery OPACK has charging, discharging, standby and other modes, and outputs power according to the power request of the vehicle controller VCU. At the same time, the ECU of the range-extended battery OPACK can also send relevant parameters of the range-extended battery OPACK (for example, remaining power, rated capacity, rated voltage, etc.) to the vehicle controller VCU, so that the vehicle controller VCU determines whether the range-extended battery OPACK needs to be charged or discharged according to the received relevant parameters of the range-extended battery OPACK.

[0097] By setting up an on-board charger OBC to connect the whole vehicle with the range-extended battery OPACK, the range-extended battery OPACK can be used to provide power to the power battery PACK through the on-board charger OBC, thereby increasing the vehicle's cruising range. At the same time, the transmission of AC power between the range-extended battery OPACK and the whole vehicle can also be realized, thereby improving the flexibility of vehicle charging and discharging.

[0098] In one embodiment, Figure 1 As shown, the battery system also includes: a low-voltage power distribution system TN and a DC conversion component DC / DC. The DC conversion component DC / DC is connected to the second DC interface of the on-board charger OBC and the vehicle controller VCU, and is used to convert the DC power output by the on-board charger OBC to power the vehicle controller VCU; the low-voltage power distribution system TN is connected to the DC conversion component DC / DC to power the vehicle's on-board low-voltage equipment.

[0099] In the above embodiments, the vehicle-mounted low-voltage equipment may include vehicle lighting equipment, alarm equipment, batteries (eg, 12V lead-acid batteries), and the like.

[0100] By setting up a direct current conversion component DC / DC and a low-voltage power distribution system TN, power can be supplied to the vehicle's onboard low-voltage equipment after the vehicle is powered on at low voltage.

[0101] In one embodiment, Figure 1 As shown, the battery system also includes a motor controller MCU, a first end of the motor controller MCU is connected to the driving mechanism M, a second end of the motor controller MCU is connected to the on-board charger OBC and the DC charging device EVSE / DC, and a control end of the motor controller MCU is connected to a signal output end of the vehicle controller VCU.

[0102] Through the above connection relationship, the motor controller MCU can control the operation of the drive mechanism M according to the output signal of the vehicle controller VCU. The drive mechanism M can be but not limited to a motor. Figure 1 For example, the on-board charger OBC and the DC conversion component DC / DC constitute an on-board charging component, which is connected to the DC transmission line through the positive high-voltage line L1 and the negative high-voltage line L3, so that the DC conversion component DC / DC converts the DC power output by the on-board charger OBC into voltage, and supplies power to the drive mechanism M, HVAC HAVC and power battery PACK through the DC transmission line. At the same time, the DC charging equipment EVSE / DC can also supply power to the on-board charger OBC through the DC transmission line.

[0103] exist Figure 1 In the embodiment, the vehicle controller VCU can send control instructions to the motor controller MCU, so that the motor controller MCU can control the driving of the driving mechanism M according to the control instructions. When the driving mechanism M needs to be driven, the motor controller MCU can provide power to the driving mechanism M through the DC transmission line to enable the driving mechanism M to operate.

[0104] It should be noted that in the above example, the DC transmission line includes a positive high-voltage line L1 and a negative high-voltage line L3. To protect the circuit, a fuse FU is provided on the positive high-voltage line L1, and a current sensor TA is provided on the negative high-voltage line L3 to prevent excessive current in the positive high-voltage line L1 from damaging components in the vehicle. In addition, for ease of management, multiple relays J are provided on the positive high-voltage line L1 and the negative high-voltage line L3, wherein the deployment of the relays J is not limited to Figure 1 The method shown can be adjusted according to actual needs.

[0105] By setting up the motor controller MCU and communicating with the vehicle controller VCU, the vehicle controller VCU can determine the strategy for providing electric energy to the drive mechanism M according to the driving power required by the drive mechanism M and the power, output power and power efficiency of the power battery PACK and the extended-range battery OPACK, so as to improve the utilization rate of electric energy and reduce energy waste while ensuring the normal operation of the drive mechanism M.

[0106] In one embodiment, the vehicle controller VCU can be connected to the range-extending battery OPACK via the controller area network bus CAN, wherein the connection method between the vehicle controller VCU and the range-extending battery OPACK may include: Figure 2 and Figure 3 Two methods are shown.

[0107] In such Figure 2In the first connection mode between the vehicle controller VCU and the range-extending battery OPACK shown, the vehicle controller VCU is connected to the on-board charger OBC and the range-extending battery OPACK through the vehicle controller local area network bus CAN. That is, in this mode, the range-extending battery OPACK and the on-board charger OBC use the vehicle CAN and are connected to the vehicle controller VCU, so there is no need to set up an additional bus for the range-extending battery OPACK, which reduces the cost.

[0108] In such Figure 3 In the second connection mode between the vehicle controller VCU and the range-extending battery OPACK shown, the vehicle controller VCU is connected to the on-board charger OBC through the vehicle controller local area network bus CAN, and is connected to the range-extending battery OPACK through the range-extending CAN. That is, in this mode, the range-extending battery OPACK and the on-board charger OBC use different buses to connect to the vehicle controller VCU, which reduces the complexity of data transmission using the same bus to transmit data, thereby reducing the risk of data mistransmission and leakage, and improving the stability and reliability of data transmission.

[0109] In one embodiment, the vehicle controller can control the charging and discharging of the range-extended battery OPACK within a target discharge power range according to the required driving power of the vehicle's driving mechanism, wherein the target discharge power range is a power range determined by the charging efficiency corresponding to the on-board charger OBC and the discharge efficiency corresponding to the AC / DC conversion component DC / AC, and the target discharge power range is the power corresponding to the optimal discharge efficiency range of the range-extended battery OPACK, that is, within the target discharge power range, the discharge efficiency of the range-extended battery OPACK is higher than the preset discharge efficiency.

[0110] In one embodiment, the vehicle controller is also used to obtain first charging efficiency data corresponding to the on-board charger and second discharge efficiency data corresponding to the AC / DC conversion component, and determine the discharge power range corresponding to the extended-range battery based on the first charging efficiency data and the second discharge efficiency data.

[0111] In one embodiment, the vehicle controller is also used to calculate the product of the first charging efficiency data and the second discharge efficiency data to obtain an initial discharge efficiency range corresponding to the extended-range battery; determine a discharge efficiency range in which the discharge efficiency of the extended-range battery is higher than a preset discharge efficiency from the initial discharge efficiency range; and determine a discharge power range corresponding to the discharge efficiency range based on a preset correlation between the discharge efficiency and the discharge power.

[0112] In one embodiment, the vehicle controller is also used to determine the target output power of the extended-range battery in the following manner: when the required driving power is less than the first discharge power, the target output power of the extended-range battery is determined to be 0, wherein the first discharge power is the lower limit value of the discharge power in the discharge power interval; when the required driving power is greater than or equal to the first discharge power and less than or equal to the second discharge power, the target output power of the extended-range battery is determined to be the required driving power, wherein the second discharge power is the upper limit value of the discharge power in the discharge power interval; when the required driving power is greater than the second discharge power, the target output power of the extended-range battery is determined to be the second discharge power.

[0113] In one embodiment, the vehicle controller is also used to control the extended-range battery to provide the required driving power for the driving mechanism in the following manner: when the required driving power is less than the first discharge power, the power battery is controlled to provide the required driving power for the driving mechanism; when the required driving power is greater than or equal to the first discharge power and less than or equal to the second discharge power, the extended-range battery is controlled to provide the required driving power for the driving mechanism with a target output power; when the required driving power is greater than the second discharge power, the extended-range battery and the power battery are controlled to provide the required driving power for the driving mechanism at the same time, wherein the sum of the target output power provided by the extended-range battery and the output power provided by the power battery is the required driving power.

[0114] In one embodiment, the vehicle controller is also used to obtain the maximum output power of the charging device and the charging device type of the charging device when the battery system is in a charging state; based on the maximum output power of the charging device and the charging strategy corresponding to the charging device type, determine the target charging power of the charging device for charging the extended-range battery.

[0115] In one embodiment, when the charging device is a DC charging device, the vehicle controller determines the target charging power of the charging device for charging the extended-range battery in the following manner: when the maximum output power of the charging device is less than or equal to the maximum charging power corresponding to the power battery, the target charging power is determined to be 0, and the DC charging device is controlled to charge the power battery; when the maximum output power of the charging device is greater than the maximum charging power corresponding to the power battery, the difference between the maximum output power of the charging device and the maximum charging power corresponding to the power battery is calculated to obtain the charging power difference; based on the charging power difference and the charging power range corresponding to the extended-range battery, the target charging power of the charging device for charging the extended-range battery is determined.

[0116] In one embodiment, the vehicle controller is also used to determine the target charging power of the charging equipment for charging the extended-range battery in the following manner: when the charging power difference is less than the first charging power, the target charging power is determined to be 0, wherein the first charging power is the lower limit of the charging power in the charging power interval; when the charging power difference is greater than or equal to the first charging power, and less than or equal to the second charging power, the target charging power is determined to be the charging power difference, wherein the second charging power is the upper limit of the charging power in the charging power interval; when the charging power difference is greater than the second charging power, the target charging power is determined to be the second charging power.

[0117] In one embodiment, the vehicle controller is also used to obtain first discharge efficiency data corresponding to the on-board charger and second charging efficiency data corresponding to the AC / DC conversion component; calculate the product of the first discharge efficiency data and the second charging efficiency data to obtain an initial charging efficiency range corresponding to the extended-range battery; determine a charging efficiency range in which the charging efficiency of the extended-range battery is higher than a preset charging efficiency from the initial charging efficiency range; and determine a charging power range corresponding to the charging efficiency range based on a preset correlation between the charging efficiency and the charging power.

[0118] In one embodiment, when the charging device is an AC charging device, the vehicle controller determines the target charging power of the charging device for charging the extended-range battery in the following manner: obtain a third charging power and a fourth charging power, wherein the third charging power is the maximum charging power corresponding to the on-board charger, and the fourth charging power is the maximum charging power corresponding to the AC / DC conversion component; when the maximum output power of the charging device is less than the third charging power, determine the target charging power to be 0, and control the on-board charger to charge the power battery with the maximum output power of the charging device; when the maximum output power of the charging device is greater than or equal to the third charging power, and less than or equal to the fifth charging power, determine the target charging power to be a sixth charging power, wherein the fifth charging power is the sum of the third charging power and the fourth charging power, and the sixth charging power is the difference between the maximum output power of the charging device and the third charging power; when the maximum output power of the charging device is greater than the fifth charging power, determine the target charging power to be the fourth charging power.

[0119] The process of implementing the above control strategy by the vehicle controller is further introduced below and will not be repeated here.

[0120] This concludes the introduction to the battery system provided in the embodiments of the present application.

[0121] As can be seen from the above introduction, the battery system provided in the embodiment of the present application increases the power of the electric vehicle by adding a detachable range-extending battery, thereby increasing the cruising range. Moreover, electric vehicles currently on the market generally have the problems of short cruising range and slow charging in the winter in the north, which greatly affects the user experience of electric vehicles. The detachable range-extending battery gives users a choice. In winter or when they need to travel long distances, they can selectively install the range-extending battery to increase the cruising range, and when they are not needed, they can also remove the range-extending battery, which improves the flexibility of adjusting the vehicle's cruising range.

[0122] In addition, in the battery system provided in the embodiment of the present application, the power of the extended-range battery can be configured according to customer needs. The ECU corresponding to the extended-range battery communicates with the vehicle controller VCU. The vehicle controller VCU controls the charging and discharging of the extended-range battery and the output power to improve the power utilization rate of the extended-range battery.

[0123] The following is an introduction to the charge and discharge control method of the battery system provided in the embodiment of the present application in conjunction with the battery system.

[0124] In one embodiment, Figure 4 The flowchart of the charge and discharge control method of the battery system is shown. The method can be applied to the battery system, and specifically to the vehicle controller VCU of the battery system. Figure 4 As shown, the method may include the following steps S401 to S404:

[0125] Step S401, obtaining the working status of the battery system.

[0126] In step S401, the working state of the battery system may include a charging state and a discharging state, wherein in the discharging state, the working mode of the on-board charger OBC is the extended-range pack driving mode; in the charging state, the working mode of the on-board charger OBC is the extended-range pack charging mode.

[0127] In one example, the vehicle controller VCU can determine the working state of the battery system by detecting the driving state of the vehicle and the battery parameters of the power battery. For example, when the vehicle controller VCU detects that the vehicle is in a driving state and the power battery PACK is low on power, the on-board charger OBC is controlled to enter the extended-range pack driving mode, and at this time, the battery system is in a discharging state. For another example, when the vehicle controller VCU detects that the vehicle is in a stopped state and the AC charging interface or DC charging interface of the vehicle is connected to the charging device, the on-board charger OBC is controlled to enter the extended-range pack driving mode, and at this time, the battery system is in a charging state.

[0128] Step S402: when the battery system is in a discharging state, obtaining the required driving power of the driving mechanism.

[0129] In step S402, after determining that the battery system is in a discharging state, the vehicle controller VCU can obtain the driving parameters such as current and voltage required for the operation of the driving mechanism M through the motor controller MCU, and calculate the driving parameters to determine the required driving power of the driving mechanism M. Among them, the required driving power can be calculated by using relevant algorithms already available in the field, and examples will not be given one by one here.

[0130] Step S403 , controlling the charging and discharging of the range-extended battery according to the required driving power, the charging efficiency of the on-board charger, and the discharging efficiency of the DC conversion component.

[0131] In step S403, the vehicle controller can determine the target output power of the range-extended battery according to the required driving power and the discharge power interval corresponding to the range-extended battery, and control the range-extended battery to provide the required driving power to the driving mechanism with the target output power. Among them, the discharge power interval corresponding to the range-extended battery is a power interval determined by the charging efficiency corresponding to the on-board charger and the discharge efficiency corresponding to the AC / DC conversion component, which is a power interval in which the discharge efficiency of the range-extended battery is higher than the preset discharge efficiency, that is, the discharge power interval is a power interval with a higher discharge efficiency of the range-extended battery. Controlling the discharge of the range-extended battery within this discharge power interval can effectively improve the discharge efficiency of the range-extended battery.

[0132] Through step S403, the target discharge power of the range-extended battery is determined from the power range with higher discharge efficiency, and then the range-extended battery is controlled to output electric energy corresponding to the target discharge power, which can effectively improve the electric energy utilization rate of the range-extended battery.

[0133] Based on the scheme defined by the above steps S401 to S403, it can be known that within the power range with higher charging and discharging efficiency, the charging and discharging efficiency of the range-extended battery is higher, and its corresponding electric energy utilization rate is also higher. In the embodiment of the present application, the discharge power range of the range-extended battery is determined by the discharge efficiency of the AC / DC conversion component and the charging efficiency of the on-board charger. Within the discharge power range, the AC / DC conversion component and the on-board charger operate in a higher efficiency range, so that the range-extended battery also has a higher discharge efficiency, thereby improving the electric energy utilization rate of the range-extended battery.

[0134] The specific implementation method of the method provided in the embodiment of the present application is introduced below.

[0135] Depend on Figure 1 As shown in the structural diagram of the battery system, the charging and discharging of the extended-range battery requires the participation of AC / DC conversion components and an on-board charger. In order to improve the discharge efficiency of the extended-range battery, it is first necessary to determine the optimal discharge power range of the extended-range battery.

[0136] In one embodiment, first, first charging efficiency data corresponding to the on-board charger and second discharge efficiency data corresponding to the AC / DC conversion component are obtained, and then, based on the first charging efficiency data and the second discharge efficiency data, the discharge power range corresponding to the extended-range battery can be determined.

[0137] In the above embodiment, the first charging efficiency data is used to characterize the correlation between the charging power and the charging efficiency of the on-board charger, which can be represented by a function expression or a curve, for example, Figure 5 A curve graph corresponding to the first charging efficiency data is shown, in which the abscissa represents the charging power of the on-board charger, and the ordinate represents the charging efficiency of the on-board charger.

[0138] In the above embodiment, the second discharge efficiency data is used to characterize the correlation between the discharge power and the discharge efficiency of the AC / DC conversion component, which can be represented by a function expression or a curve, for example, Figure 6 A curve graph corresponding to the second discharge efficiency data is shown, in which the abscissa represents the discharge power of the AC / DC conversion component, and the ordinate represents the discharge efficiency of the AC / DC conversion component.

[0139] After obtaining the first charging efficiency data and the second discharging efficiency data, the discharge power range corresponding to the range-extended battery can be obtained by data fitting. The discharge power range of the range-extended battery is determined by the discharge efficiency of the AC / DC conversion component and the charging efficiency of the on-board charger, so that the range-extended battery is discharged within a higher efficiency discharge power range, thereby improving the discharge efficiency of the range-extended battery.

[0140] In one embodiment, the discharge power range corresponding to the extended-range battery may be determined by performing curve fitting on the first charging efficiency data and the second discharging efficiency data.

[0141] Specifically, the product of the first charging efficiency data and the second discharging efficiency data is calculated to obtain an initial discharge efficiency interval corresponding to the extended-range battery; then, a discharge efficiency interval in which the discharge efficiency of the extended-range battery is higher than a preset discharge efficiency is determined from the initial discharge efficiency interval; and then, based on a preset correlation between the discharge efficiency and the discharge power, a discharge power interval corresponding to the discharge efficiency interval can be determined.

[0142] by Figure 5 and Figure 6For example, for the on-board charger and the AC / DC conversion component, under the same charging power and discharging power, calculate the product of the charging efficiency corresponding to the on-board charger and the discharging efficiency corresponding to the AC / DC conversion component, and you can get the discharge efficiency corresponding to the range-extended battery under the discharge power. For example, when the charging power is 1kW, the charging efficiency corresponding to the on-board charger is 88.34%; when the discharging power is 1kW, the discharge efficiency of the AC / DC conversion component is 86.34%, then when the discharging power is 1kW, the discharge efficiency corresponding to the range-extended battery is 76.27%. By analogy, we can get the correlation between the discharge power and discharge efficiency of the range-extended battery, such as Figure 7 Then, set the preset discharge efficiency (for example, 88%) according to actual needs, and Figure 7 When the discharge efficiency is determined to be greater than 88%, the discharge power corresponding to the extended-range battery can be obtained, and the discharge power range can be obtained.

[0143] The discharge power range of the extended-range battery is determined by the first charging efficiency data corresponding to the on-board charger and the second discharge efficiency data corresponding to the AC / DC conversion component. Within the discharge power range, the AC / DC conversion component and the on-board charger operate in a higher efficiency range, so that the extended-range battery also has a higher discharge efficiency, thereby improving the energy utilization rate of the extended-range battery.

[0144] Furthermore, after determining the discharge power range corresponding to the range-extended battery, the vehicle controller can determine the target output power of the range-extended battery according to the required driving power and the discharge power range corresponding to the range-extended battery. Figure 8 As shown, the process may include the following steps:

[0145] Step S801: when the driving power is required Less than the first discharge power In this case, the target output power of the extended-range battery is determined to be 0. At this time, the extended-range battery does not work, and the vehicle controller controls the power battery to provide the required driving power for the drive mechanism.

[0146] In step S801, the first discharge power is the lower limit value of the discharge power in the discharge power range; .

[0147] Step S802: when the driving power is required Greater than or equal to the first discharge power , and is less than or equal to the second discharge power In this case, the target output power of the extended-range battery is determined to be the required driving power. At this time, the vehicle controller controls the extended-range battery to provide the required driving power to the driving mechanism with the target output power.

[0148] In step S802, the second discharge power is the upper limit value of the discharge power in the discharge power range;

[0149] Step S803: when the driving power is required Greater than the second discharge power In this case, the target output power of the range-extended battery is determined to be the second discharge power. At this time, the vehicle controller controls the range-extended battery and the power battery to simultaneously provide the required driving power for the drive mechanism. The sum of the target output power provided by the range-extended battery and the output power provided by the power battery is the required driving power. That is, in this scenario, the range-extended battery outputs the maximum discharge power, and the power battery supplements the remaining driving power required by the drive mechanism. .

[0150] Through the discharge strategy of the range-extended battery provided in step S801 to step S803, the range-extended battery is discharged within a discharge power range with higher discharge efficiency, so as to improve the discharge efficiency of the range-extended battery and further improve the electric energy utilization rate of the range-extended battery.

[0151] In one embodiment, when the battery system is in a charging state, the vehicle controller also determines the target charging power for charging the range-extended battery according to the output power of the charging device. Fig. 9 As shown, the charging method of the range-extended battery may include the following steps:

[0152] Step S401, obtaining the working status of the battery system.

[0153] Step S902: when the battery system is in a charging state, obtain the maximum output power of the charging device and the charging device type of the charging device.

[0154] In step S902, the charging device type of the charging device may include a DC charging device and an AC charging device. The vehicle controller may determine the charging device type of the charging device by judging the connection status of the DC charging interface and the AC charging interface. For example, when it is detected that a charging device is connected to the DC charging interface, it may be determined that the charging device is a DC charging device; when it is detected that a charging device is connected to the AC charging interface, it may be determined that the charging device is an AC charging device.

[0155] Step S903 , determining a target charging power for the charging device to charge the extended-range battery according to the maximum output power of the charging device and a charging strategy corresponding to the type of the charging device.

[0156] In step S903, when charging the extended-range battery, different charging strategies are used to charge the extended-range battery according to the type of charging equipment to improve the charging efficiency of the extended-range battery. Moreover, during the charging process, the maximum output power of the charging equipment is also taken into account, so that if the conditions are met, the maximum output power of the charging equipment can be used to charge the extended-range battery, which can further improve the charging efficiency of the extended-range battery.

[0157] The following introduces the charging strategy of the extended-range battery in two scenarios.

[0158] When the charging device is a DC charging device, the charging process of the range-extended battery can be as follows: Fig.10 As shown, the process may include the following steps:

[0159] Step S1001: at the maximum output power of the charging device Less than or equal to the maximum charging power of the power battery In this case, the target charging power is determined to be 0, and the DC charging equipment is controlled to charge the power battery.

[0160] That is, in this scenario, the DC charging equipment charges the power battery first, and then charges the range-extended battery after the power battery is fully charged.

[0161] Step S1002: at the maximum output power of the charging device Greater than the maximum charging power of the power battery Calculate the maximum output power of the charging device under the condition of Maximum charging power corresponding to the power battery The difference in charging power is obtained. ;

[0162] Step S1003: according to the charging power difference And the charging power range corresponding to the extended-range battery, determine the target charging power of the charging equipment for charging the extended-range battery.

[0163] The charging of the range-extended battery can be realized through the above steps S1001 to S1003. When the maximum output power of the charging device cannot meet the charging demand of the power battery, the power battery is charged first to ensure the normal operation of the vehicle. After the power battery is fully charged, the range-extended battery is charged to increase the vehicle's cruising range. When the maximum output power of the charging device can meet the charging demand of the power battery, the range-extended battery is charged in combination with the charging power range of the range-extended battery to improve the charging efficiency of the range-extended battery.

[0164] Regarding step S1003, it can be divided into three cases, as follows: Fig.11 As shown:

[0165] Step S1101, when the charging power difference Less than the first charging power In this case, the target charging power is determined to be 0. In this scenario, the DC charging equipment does not charge the extended-range battery.

[0166] In step S1101, the first charging power is the lower limit of the charging power in the charging power range.

[0167] Step S1102, when the charging power difference Greater than or equal to the first charging power , and is less than or equal to the second charging power In the case of , the target charging power is determined to be the charging power difference.

[0168] In step S1102, the second charging power is the upper limit of the charging power range. That is, in this scenario, the remaining power (i.e., the charging power difference) after the DC charging device charges the power battery is within the charging power range of the extended-range battery. At this time, using this remaining power to charge the extended-range battery can improve the charging efficiency of the extended-range battery.

[0169] Step S1103, when the charging power difference Greater than the second charging power In this case, the target charging power is determined to be the second charging power. That is, in this scenario, the remaining power (i.e., the charging power difference) after the DC charging device charges the power battery exceeds the charging power range of the extended-range battery. At this time, the maximum charging power (i.e., the second charging power) that the extended-range battery can withstand is used. ) to charge the extended-range battery, which not only ensures the safe charging of the extended-range battery, but also improves the charging efficiency of the extended-range battery.

[0170] Through the above steps S1101 to S1103, when the maximum output power of the charging equipment can meet the charging demand of the power battery, the extended-range battery is charged in combination with the charging power range of the extended-range battery, which not only ensures the safe charging of the extended-range battery, but also improves the charging efficiency of the extended-range battery.

[0171] It should be noted that in the above steps S1101 to S1103, the charging power interval of the extended-range battery is determined by the discharge efficiency data corresponding to the on-board charger and the charging efficiency data corresponding to the AC / DC conversion component.

[0172] In one embodiment, first discharge efficiency data corresponding to the on-board charger and second charging efficiency data corresponding to the AC / DC conversion component are obtained; then, the product of the first discharge efficiency data and the second charging efficiency data is calculated to obtain an initial charging efficiency interval corresponding to the range-extended battery; then, a charging efficiency interval in which the charging efficiency of the range-extended battery is higher than a preset charging efficiency is determined from the initial charging efficiency interval; and then, based on a preset correlation between the charging efficiency and the charging power, a charging power interval corresponding to the charging efficiency interval can be determined.

[0173] It should be noted that the method for determining the charging power range of the extended-range battery is the same as the method for determining the discharging power range of the extended-range battery, which will not be repeated here.

[0174] The charging power range of the extended-range battery is determined by the first discharge efficiency data corresponding to the on-board charger and the second charging efficiency data corresponding to the AC / DC conversion component. Within the charging power range, the AC / DC conversion component and the on-board charger operate in a higher efficiency range, so that the extended-range battery also has a higher charging efficiency, thereby improving the charging efficiency of the extended-range battery.

[0175] When the charging device is an AC charging device, the charging process of the extended-range battery can be as follows: Fig.12 As shown, the process may include the following steps S1201 to S1203:

[0176] Step S1201: at the maximum output power of the charging device Less than the third charging power In the case of the above, the target charging power is determined to be 0, and the on-board charger is controlled to output the maximum output power of the charging equipment. Charge the power battery.

[0177] In step S1201, the third charging power It is the maximum charging power corresponding to the on-board charger, which can be determined by the vehicle controller according to the CC / CP signal.

[0178] In the scenario defined in step S1201, the range-extended battery is not charged, and the onboard charger charges the power battery of the vehicle, and its charging power is the maximum output power of the AC charging device. Using the maximum output power to charge the power battery can improve the charging efficiency of the power battery.

[0179] Step S1202: at the maximum output power of the charging device Greater than or equal to the third charging power , and is less than or equal to the fifth charging power In the case of .

[0180] In step S1202, the fifth charging power is the third charging power With the fourth charging power The sum of the fourth charging power is the maximum charging power corresponding to the AC / DC conversion component; the sixth charging power is the maximum output power of the charging device With third charging power difference.

[0181] In this scenario, the AC charging equipment gives priority to charging the vehicle's power battery, and the excess power is used to charge the range-extended battery. The power used to charge the power battery is the third charging power. , the power used to charge the range-extended battery is the sixth charging power .

[0182] Step S1203: at the maximum output power of the charging device Greater than the fifth charging power In the case of .

[0183] In this scenario, the maximum power is used to charge the power battery and the range-extending battery of the whole vehicle, where the power for charging the power battery of the whole vehicle is , the power for charging the range-extended battery is .

[0184] Through the above steps S1201 to S1203, when the maximum output power of the AC charging device cannot meet the charging demand of the power battery, the power battery is charged first to ensure the normal operation of the vehicle; when the maximum output power of the AC charging device can meet the charging demand of the power battery, the maximum charging power that the AC charging device can provide is used to charge the extended-range battery to improve the charging efficiency of the extended-range battery.

[0185] This completes the explanation of the method provided in the embodiments of the present application.

[0186] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0187] In one embodiment, the present application further provides a readable storage medium having computer program instructions stored thereon. When the computer program instructions are executed by a processor, the above-mentioned battery system charge and discharge control method is implemented.

[0188] In one embodiment, the present application further provides a computer program product. When instructions in the computer program product are executed by a processor of an electronic device, the electronic device executes the above-mentioned battery system charge and discharge control method.

[0189] It should be clear that the present application is not limited to the specific configuration and processing described above and shown in the figures. For the sake of simplicity, a detailed description of the known method is omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of the present application is not limited to the specific steps described and shown, and those skilled in the art can make various changes, modifications and additions, or change the order between the steps after understanding the spirit of the present application.

[0190] The functional blocks shown in the above structural block diagram can be implemented as hardware, software, firmware or a combination thereof. When implemented in hardware, it can be, for example, an electronic circuit, an application-specific integrated circuit (ASIC), appropriate firmware, a plug-in, a function card, etc. When implemented in software, the elements of the present application are programs or code segments used to perform the required tasks. The program or code segment can be stored in a machine-readable medium, or transmitted on a transmission medium or a communication link via a data signal carried in a carrier. "Machine-readable medium" may include any medium capable of storing or transmitting information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROMs, flash memory, erasable ROMs (EROMs), floppy disks, CD-ROMs, optical disks, hard disks, optical fiber media, radio frequency (RF) links, etc. The code segment can be downloaded via a computer network such as the Internet, an intranet, etc.

[0191] It should also be noted that the exemplary embodiments mentioned in this application describe some methods or systems based on a series of steps or devices. However, this application is not limited to the order of the above steps, that is, the steps can be performed in the order mentioned in the embodiment, or in a different order from the embodiment, or several steps can be performed simultaneously.

[0192] The above describes various aspects of the present application with reference to the flowchart and / or block diagram of the battery system and the charge and discharge control method of the battery system according to the embodiment of the present application. It should be understood that each box in the flowchart and / or block diagram and the combination of each box in the flowchart and / or block diagram can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device to produce a machine so that these instructions executed by the processor of the computer or other programmable data processing device enable the implementation of the function / action specified in one or more boxes of the flowchart and / or block diagram. Such a processor can be, but is not limited to, a general-purpose processor, a special-purpose processor, a special application processor, or a field programmable logic circuit. It can also be understood that each box in the block diagram and / or flowchart and the combination of boxes in the block diagram and / or flowchart can also be implemented by dedicated hardware that performs a specified function or action, or can be implemented by a combination of dedicated hardware and computer instructions.

[0193] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; 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, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery system, characterized in that: include: Vehicle controller, on-board charger and AC / DC conversion components; The vehicle controller is connected to the AC / DC conversion component and the range-extending battery, and is connected to the on-board charger, and is used to control the charging and discharging of the range-extending battery according to the required driving power of the vehicle's driving mechanism, the charging efficiency corresponding to the on-board charger, and the discharging efficiency corresponding to the AC / DC conversion component; The on-board charger is connected to the AC / DC conversion component and is used to convert the AC power output by the AC / DC conversion component into DC power and supply power to the driving mechanism; The AC / DC conversion component is connected to the range-extending battery and is used to convert the DC power output by the range-extending battery into AC power; The vehicle controller is used to control the range-extended battery to charge and discharge within a target discharge power range according to the required driving power of the vehicle's driving mechanism, wherein the target discharge power range is a power range determined by the charging efficiency corresponding to the on-board charger and the discharge efficiency corresponding to the AC / DC conversion component; The vehicle controller is further used to determine the discharge power interval corresponding to the discharge efficiency interval according to the preset correlation between the discharge efficiency and the discharge power, wherein the discharge efficiency interval is an interval in which the discharge efficiency is higher than the preset discharge efficiency, and the discharge efficiency interval is determined by the first charging efficiency data corresponding to the on-board charger and the second discharge efficiency data corresponding to the AC / DC conversion component; The vehicle controller is also used to determine the target output power of the extended-range battery in the following manner: when the required driving power is less than the first discharge power, the target output power of the extended-range battery is determined to be 0, wherein the first discharge power is the lower limit of the discharge power in the discharge power interval; when the required driving power is greater than or equal to the first discharge power and less than or equal to the second discharge power, the target output power of the extended-range battery is determined to be the required driving power, wherein the second discharge power is the upper limit of the discharge power in the discharge power interval; when the required driving power is greater than the second discharge power, the target output power of the extended-range battery is determined to be the second discharge power.

2. The system according to claim 1, characterized in that The alternating current converted by the AC / DC conversion component is single-phase alternating current or three-phase alternating current.

3. The system according to claim 1, characterized in that The AC / DC conversion component includes a first DC interface, a first AC interface and a first conversion component; The first DC interface is connected to the range-extending battery; The first AC interface is connected to the second AC interface of the on-board charger; The first conversion component is connected between the first DC interface and the first AC interface.

4. The system according to claim 3, characterized in that The on-board charger includes the second AC interface, the second DC interface and the second conversion component; The second AC interface is connected to an AC charging device through an AC charging interface and is connected to the range-extending battery; The second DC interface is connected to the DC charging device through the DC charging interface, and is connected to the power battery and the vehicle-mounted high-voltage device; The second conversion component is connected between the second AC interface and the first DC interface.

5. The system according to claim 4, characterized in that The battery system further comprises: a DC conversion component, connected to the second DC interface and the vehicle controller, and configured to perform voltage conversion on the DC power output by the on-board charger to supply power to the vehicle controller; A low-voltage power distribution system is connected to the DC conversion component and is used to supply power to the vehicle's onboard low-voltage equipment.

6. The system according to claim 4, characterized in that The battery system further includes: a motor controller; The first end of the motor controller is connected to the driving mechanism, the second end of the motor controller is connected to the on-board charger and the DC charging device, and the control end of the motor controller is connected to the signal output end of the vehicle controller; The motor controller is used to control the operation of the driving mechanism according to the output signal of the vehicle controller.

7. The system according to any one of claims 1 to 6, characterized in that: The vehicle controller is connected to the on-board charger and the range-extending battery via a vehicle controller local area network bus CAN.

8. The system according to any one of claims 1 to 6, characterized in that: The vehicle controller is connected to the on-board charger via a vehicle controller local area network bus CAN, and is connected to the extended-range battery via an extended-range CAN.

9. The system according to claim 1, characterized in that The vehicle controller is also used to calculate the product of the first charging efficiency data and the second discharging efficiency data to obtain an initial discharge efficiency range corresponding to the extended-range battery; and determine a discharge efficiency range in which the discharge efficiency of the extended-range battery is higher than a preset discharge efficiency from the initial discharge efficiency range.

10. The system according to claim 9, characterized in that The vehicle controller is also used to control the range-extending battery to provide the required driving power to the driving mechanism in the following manner: When the required driving power is less than the first discharge power, controlling the power battery to provide the driving mechanism with the required driving power; When the required driving power is greater than or equal to the first discharge power and less than or equal to the second discharge power, controlling the range-extended battery to provide the driving mechanism with the required driving power at the target output power; When the required driving power is greater than the second discharge power, the range-extending battery and the power battery are controlled to simultaneously provide the required driving power to the driving mechanism, wherein the sum of the target output power provided by the range-extending battery and the output power provided by the power battery is the required driving power.

11. The system according to claim 1, characterized in that The vehicle controller is also used to obtain the maximum output power of the charging device and the charging device type of the charging device when the battery system is in a charging state; and determine the target charging power of the charging device for charging the extended-range battery based on the maximum output power of the charging device and the charging strategy corresponding to the charging device type.

12. The system according to claim 11, characterized in that In the case where the charging device is a DC charging device, the vehicle controller determines the target charging power of the charging device for charging the extended-range battery in the following manner: When the maximum output power of the charging device is less than or equal to the maximum charging power corresponding to the power battery, determining the target charging power to be 0, and controlling the DC charging device to charge the power battery; When the maximum output power of the charging device is greater than the maximum charging power corresponding to the power battery, calculating the difference between the maximum output power of the charging device and the maximum charging power corresponding to the power battery to obtain the charging power difference; A target charging power for charging the extended-range battery by the charging device is determined according to the charging power difference and the charging power interval corresponding to the extended-range battery.

13. The system according to claim 12, characterized in that The vehicle controller is also used to determine the target charging power of the charging device for charging the extended-range battery in the following manner: When the charging power difference is less than a first charging power, determining the target charging power to be 0, wherein the first charging power is a lower limit of the charging power in the charging power interval; When the charging power difference is greater than or equal to the first charging power and less than or equal to the second charging power, determining the target charging power to be the charging power difference, wherein the second charging power is the upper limit of the charging power in the charging power interval; When the charging power difference is greater than the second charging power, the target charging power is determined to be the second charging power.

14. The system according to claim 12 or 13, characterized in that The vehicle controller is also used to obtain first discharge efficiency data corresponding to the on-board charger and second charging efficiency data corresponding to the AC / DC conversion component; Calculating the product of the first discharge efficiency data and the second charging efficiency data to obtain an initial charging efficiency range corresponding to the range-extended battery; Determining, from the initial charging efficiency interval, a charging efficiency interval in which the charging efficiency of the range-extended battery is higher than a preset charging efficiency; According to a preset correlation between charging efficiency and charging power, a charging power range corresponding to the charging efficiency range is determined.

15. The system according to claim 11, characterized in that When the charging device is an AC charging device, the vehicle controller determines the target charging power of the charging device for charging the extended-range battery in the following manner: Obtaining a third charging power and a fourth charging power, wherein the third charging power is the maximum charging power corresponding to the on-board charger, and the fourth charging power is the maximum charging power corresponding to the AC / DC conversion component; When the maximum output power of the charging device is less than the third charging power, determining the target charging power to be 0, and controlling the on-board charger to charge the power battery with the maximum output power of the charging device; When the maximum output power of the charging device is greater than or equal to the third charging power and less than or equal to the fifth charging power, the target charging power is determined to be a sixth charging power, wherein the fifth charging power is the sum of the third charging power and the fourth charging power, and the sixth charging power is the difference between the maximum output power of the charging device and the third charging power; When the maximum output power of the charging device is greater than the fifth charging power, the target charging power is determined to be the fourth charging power.

16. A method for controlling charge and discharge of a battery system, characterized in that: Applied to the battery system according to any one of claims 1 to 15, the method comprising: Obtaining the working status of the battery system; When the battery system is in a discharging state, obtaining a required driving power of a driving mechanism; The charging and discharging of the range-extended battery is controlled according to the required driving power, the charging efficiency corresponding to the on-board charger, and the discharging efficiency corresponding to the AC / DC conversion component.

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