Range-extending battery device and battery system

Abstract

The utility model provides a range-extending battery device and a battery system, and belongs to the technical field of batteries. The extended range battery device includes: an extended range battery configured to output direct current; the alternating current and direct current power converter is connected with the range extending battery and is configured to perform alternating current and direct current conversion on the direct current output by the range extending battery and output the converted alternating current; the first battery interface is connected with the alternating current-direct current power converter and is configured to connect the alternating current-direct current power converter with a vehicle-mounted charger in the electric vehicle under the condition that the range extending battery device is connected with the electric vehicle; the controller is configured to send a range extending control instruction; and the second battery interface is connected with the controller and is configured to transmit the range extending control instruction to the vehicle-mounted charger under the condition that the range extending battery device is connected with the electric vehicle. According to the range-extending battery device, the application scene of the range-extending battery device is expanded, and the cruising ability of the electric vehicle is effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a range extending battery device and a battery system. BACKGROUND

[0002] Energy saving and emission reduction is the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their energy saving and environmental protection advantages. For electric vehicles, battery technology is an important factor for their development.

[0003] At present, one of the main problems of electric vehicles is short endurance. How to improve the endurance mileage of electric vehicles has always been a concern. The range extending battery device can provide additional electric energy to the electric vehicle, increasing the endurance mileage of the electric vehicle. Therefore, improving the design of the range extending battery device is of great significance to improve the endurance of the electric vehicle. CONTENT OF THE INVENTION

[0004] The present application aims to at least solve the technical problem of short endurance of electric vehicles in the background art. To this end, one object of the present application is to provide a range extending battery device that can be used to improve the endurance mileage when needed by the user.

[0005] The embodiment of the first aspect of the present application provides a range extending battery device, comprising: a range extending battery configured to output direct current; an AC / DC power converter connected with the range extending battery, configured to convert the direct current output by the range extending battery into alternating current and output the converted alternating current; a first battery interface connected with the AC / DC power converter, configured to connect the AC / DC power converter with an on-board charger in an electric vehicle when the range extending battery device is connected with the electric vehicle; a controller configured to send a range extending control instruction, the range extending control instruction being used to instruct the on-board charger to charge a power battery in the electric vehicle using the alternating current output by the AC / DC power converter; and a second battery interface connected with the controller, configured to transmit the range extending control instruction to the on-board charger when the range extending battery device is connected with the electric vehicle.

[0006] In the technical solution of the embodiment of the present application, the range extending battery device can be connected at the AC interface of the electric vehicle. The user can selectively use the range extending battery device, when not needed, the connection between the range extending battery device and the electric vehicle can be disconnected, and the range extending battery device can be removed from the vehicle; when needed, the range extending battery device can be installed on the electric vehicle, by sending the range extending control instruction to the on-board charger, the electric energy of the range extending battery device can be used to increase the endurance mileage of the vehicle, expand the application scenarios of the range extending battery device, and effectively improve the endurance of the electric vehicle.

[0007] In some embodiments, the range extending control instructions include a connection confirmation signal for indicating a connection state between the range extending battery device and the on-board charger, and / or a control guide signal for controlling a charging process and / or a discharging process between the range extending battery device and the on-board charger. By sending the corresponding control instructions from the controller in the range extending battery device to the on-board charger, the on-board charger can effectively utilize the electric energy of the range extending battery device, and the effective control of the range extending battery device for power supply can be achieved.

[0008] In some embodiments, the AC-DC power converter includes a bidirectional DC-AC converter. By using the bidirectional DC-AC converter, the range extending battery device can be used to supply power to the vehicle, and the power battery in the vehicle can also be used to charge the range extending battery, fully meeting the power demand in different scenarios.

[0009] In some embodiments, the AC power output by the AC-DC power converter includes single-phase AC power and / or three-phase AC power. The AC power output by the AC-DC power converter can be set according to the use demand, meeting different power demands and expanding the application range of the range extending battery device.

[0010] In some embodiments, the second battery interface includes a controller area network communication interface. By using the controller area network communication interface to transmit the range extending control instructions, the transmission quality can be improved, and the flexibility, real-time performance and reliability of the transmission process can be improved.

[0011] In some embodiments, the range extending battery device further includes a third battery interface connected to the controller and configured to connect the controller to a battery management system and / or a vehicle control unit in an electric vehicle when the range extending battery device is connected to the electric vehicle. By connecting the controller to the battery management system and / or the vehicle control unit through the third battery interface, the controller in the range extending battery device can be controlled according to the power demand of the electric vehicle side, so that the range extending battery device can perform corresponding functions and further meet the user demand.

[0012] In some embodiments, the third battery interface includes a controller area network communication interface. By using the controller area network communication interface to realize the communication between the controller and the battery management system and / or the vehicle control unit, the transmission quality can be improved, and the flexibility, real-time performance and reliability of the transmission process can be improved.

[0013] In some embodiments, the controller is further configured to control the AC-DC power converter to output the converted AC power at a first predetermined power in response to receiving a first output instruction from the vehicle control unit. By outputting the AC power at a predetermined power according to the instruction of the vehicle control unit, the power demand of the electric vehicle can be fully met, and the discharging efficiency of the range extending battery device can be improved.

[0014] In some embodiments, the range-extending battery device further comprises a fourth battery interface connected with the AC-DC power converter and configured to transmit the AC power output by the AC-DC power converter. By providing the fourth battery interface, the electric energy of the range-extending battery device can be used in different scenarios, thereby expanding the application range of the range-extending battery device.

[0015] Embodiments of the second aspect of the present application provide a battery system, comprising: the range-extending battery device in the above embodiments; a power battery arranged in an electric vehicle and configured to output DC power; and an on-board charger arranged in the electric vehicle and connected with the power battery, the on-board charger being configured to charge the power battery using the AC power output by the AC-DC power converter according to the range-extending control instruction. By adding the range-extending battery device to the electric vehicle, the on-board charger can charge the power battery using the electric energy of the range-extending battery device, thereby increasing the cruising range of the vehicle and effectively improving the cruising capability of the electric vehicle.

[0016] In some embodiments, the on-board charger is further configured to: convert the DC power output by the power battery into AC power and output the converted AC power; and in the case where the range-extending battery device is connected with the electric vehicle, transmit the converted AC power to the AC-DC power converter through the first battery interface. The on-board charger can charge the power battery using the range-extending battery device, and can also charge the range-extending battery using the electric energy of the power battery in the vehicle, thereby fully meeting the power demand in different scenarios.

[0017] In some embodiments, the battery system further comprises a battery management system arranged in the electric vehicle and configured to be connected with the controller in the range-extending battery device through the third battery interface of the range-extending battery device in the case where the range-extending battery device is connected with the electric vehicle. By connecting the controller with the battery management system through the third battery interface, the controller in the range-extending battery device can be controlled by the battery management system according to the power demand on the electric vehicle side, so that the range-extending battery device implements corresponding functions, thereby further meeting the user demand.

[0018] In some embodiments, the battery system further comprises a vehicle controller arranged in the electric vehicle and configured to be connected with the controller in the range-extending battery device through the third battery interface of the range-extending battery device in the case where the range-extending battery device is connected with the electric vehicle. By connecting the controller with the vehicle controller through the third battery interface, the controller in the range-extending battery device can be controlled by the vehicle controller according to the power demand on the electric vehicle side, so that the range-extending battery device implements corresponding functions, thereby further meeting the user demand.

[0019] In some embodiments, the vehicle controller is configured to: determine an output power of the AC-DC power converter; and send, according to the output power, a first output instruction to the range-extended battery device, the first output instruction instructing the AC-DC power converter to output converted AC power at a first predetermined power. The vehicle controller can determine the power required to be output by the AC-DC power converter, and send an instruction to the range-extended battery device to control the AC-DC power converter to output AC power at a predetermined power, so that the power demand of the electric vehicle can be fully met, and the utilization rate of electric energy is improved.

[0020] In some embodiments, the battery system further comprises: a first vehicle interface arranged in the electric vehicle and connected with the on-board charger, the first vehicle interface being configured to connect with the first battery interface to connect the on-board charger with the AC-DC power converter. By arranging the first vehicle interface matched with the first battery interface, energy transmission between the range-extended battery device and the electric vehicle can be achieved, the cruising range of the vehicle is increased, and the utilization rate of electric energy is improved.

[0021] The above description is merely a summary of the technical solutions of the present application. In order to enable one skilled in the art to further understand the technical means of the present application, the contents of the description can be implemented, and in order to enable the above and other purposes, features and advantages of the present application to be more obvious and easy to understand, the specific embodiments of the present application are described below. BRIEF DESCRIPTION OF DRAWINGS

[0022] In the drawings, like reference numerals refer to like elements throughout the various drawings. The drawings are not necessarily to scale, emphasis instead being placed on illustrating the principles of the application. It should be understood that the drawings are merely depictions of some embodiments of the application and should not be construed as limiting the scope of the application.

[0023] Figure 1 Structure diagram of a vehicle according to some embodiments of the present application;

[0024] Figure 2 Schematic block diagram of a range-extended battery device according to some embodiments of the present application;

[0025] Figure 3 Schematic block diagram of a battery system according to some embodiments of the present application;

[0026] Figure 4 Schematic block diagram of a battery system according to some embodiments of the present application;

[0027] Figure 5 Schematic block diagram of a range-extended battery device according to some embodiments of the present application.

[0028] BRIEF DESCRIPTION OF DRAWINGS

[0029] Electric vehicle 1000;

[0030] Power battery 100, vehicle controller 200, motor 300, range-extended battery device 400, battery system 500;

[0031] Range-extended battery 410, AC / DC power converter 420, controller 430, on-board charger 110, battery management system 120. DETAILED DESCRIPTION

[0032] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0034] 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 explicitly and specifically limited.

[0035] In this paper, the phrase "embodiment" means that the specific features, structures or properties described in conjunction with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase in the specification does not necessarily mean the same embodiment, nor is it an independent or alternative embodiment that is not mutually exclusive with other embodiments. The skilled person in the art explicitly and implicitly understands that the embodiments described herein can be combined with other embodiments.

[0036] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship between the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents a "or" relationship between the front and rear associated objects.

[0037] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two), and similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0038] In the description of the embodiments of the present application, the orientations or positional relationships indicated by the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and 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 devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0039] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium, or can be the internal communication of two elements or the interaction relationship between two elements. For those skilled 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.

[0040] At present, from the development of market situation, the application of power battery is more and more extensive. The power battery is not only applied to energy storage power supply systems such as hydroelectric, thermal, wind and solar power stations, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment, aerospace and other fields. With the continuous expansion of the application field of power battery, the market demand is also increasing.

[0041] The current electric vehicles have two main pain points: short endurance and slow charging. With the popularization of super charging technology, the problem of slow charging has been significantly improved. However, the problem of short endurance is still the most obvious user pain point perceived by consumers and the most difficult to improve. How to improve the endurance mileage of electric vehicles has been a concern.

[0042] At present, part of the vehicles are provided with range extending battery devices. The range extending battery device can provide additional electric energy to the electric vehicle, and increase the endurance mileage of the electric vehicle. However, the range extending battery device usually only has a direct current-direct current converter, which can only be connected at the direct current interface of the electric vehicle, and cannot be applied in vehicles with alternating current interface. And because it can only output direct current, the power utilization rate of the range extending battery device is not high enough.

[0043] In order to expand the application scenarios of the extended-range battery device and improve the endurance of the electric vehicle, an AC-DC power converter can be arranged in the extended-range battery device, so that the extended-range battery device can be applied to a vehicle with an AC interface. The controller arranged in the extended-range battery device sends an extended-range control instruction to the on-board charger, so that the on-board charger can effectively utilize the electric energy in the extended-range battery device.

[0044] The extended-range battery device disclosed in the embodiments of the present application can be used in an electric vehicle or other electric device. The extended-range battery device disclosed in the present application can be used to expand the application scenarios of the extended-range battery device and increase the endurance of the electric vehicle.

[0045] The following embodiments are described by taking an electric vehicle 1000 as an example for convenience of description.

[0046] Please refer to Figure 1 , Figure 1 The electric vehicle 1000 can be a new energy vehicle, which can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle. The electric vehicle 1000 is internally provided with a power battery 100, which can be arranged at the bottom, head or tail of the electric vehicle 1000. The power battery 100 can be used for power supply of the electric vehicle 1000, for example, the power battery 100 can be used as an operating power source of the electric vehicle 1000. The electric vehicle 1000 can further include a vehicle controller 200 and a motor 300, and the vehicle controller 200 is used to control the power battery 100 to supply power to the motor 300.

[0047] In some embodiments of the present application, the power battery 100 can not only be used as an operating power source of the electric vehicle 1000, but also be used as a driving power source of the electric vehicle 1000, to replace or partially replace fuel or natural gas to provide driving power for the electric vehicle 1000.

[0048] The extended-range battery device 400 can be mounted on the electric vehicle 1000 shown in Figure 1 in a detachable manner. The user can selectively use the extended-range battery device 400, which can be added to the electric vehicle 1000 when needed, and can be detached from the electric vehicle 1000 when not needed.

[0049] The embodiments of the present application provide an extended-range battery device. Referring to Figure 2 , the extended-range battery device 400 includes an extended-range battery 410, an AC-DC power converter 420, a controller 430, a first battery interface A and a second battery interface B.

[0050] The extended-range battery 410 is configured to output DC power.

[0051] The AC / DC power converter 420 is connected to the range extender battery 410 and is configured to convert the DC power output from the range extender battery 410 into AC power and output the converted AC power.

[0052] The first battery interface A is connected to the AC / DC power converter 420 and is configured to connect the AC / DC power converter 420 to the on-board charger 110 in the electric vehicle 1000 when the range extender battery device 400 is connected to the electric vehicle 1000.

[0053] The controller 430 is configured to send range-extending control commands. The range-extending control commands are used to instruct the on-board charger 110 to charge the power battery 100 in the electric vehicle 1000 using the AC power output from the AC-DC power converter 420.

[0054] The second battery interface B is connected to the controller 430 and is configured to transmit range-extending control commands to the on-board charger 110 when the range-extending battery device 400 is connected to the electric vehicle 1000.

[0055] The range extender battery 410, as part of the range extender battery device 400, can use a power battery. A power battery, also known as a high-voltage battery, has a high output voltage, typically above 200 volts (V), and is used to provide power to the vehicle, meeting its significant power demands. The battery capacity of the range extender battery 410 can be set according to usage requirements.

[0056] The AC / DC power converter 420 can perform AC / DC conversion, converting DC to AC and vice versa. The range extender battery device 400 is provided with a first battery interface A and a second battery interface B. The first battery interface A is used to transmit the AC power converted by the AC / DC power converter 420. Depending on the type of output AC power, the first battery interface A may include a live wire terminal, a neutral wire terminal, and a ground wire terminal, or it may include the phase wire terminals corresponding to the three phase wires respectively. The second battery interface B is used to transmit control commands sent by the controller 430 and communication signals from external inputs to the range extender battery device 400. It should be understood that although the first battery interface A and the second battery interface B are... Figure 2 While the components are illustrated as being set up separately and independent of each other, in other embodiments they may also be integrated together and use the same hardware interface, which is not limited in this application.

[0057] The controller 430 can send range-extending control commands to the on-board charger 110 via the second battery interface B. For example... Figure 3As shown, the on board charger (OBC) is a charger installed on the electric vehicle, connected with the power battery 100 in the vehicle, and capable of charging the power battery 100 and the like. When the range extending battery device 400 is connected with the vehicle 1000, the on board charger 110 charges the power battery 100 using the alternating current transmitted through the first battery interface A after receiving the range extending control instruction input through the second battery interface B.

[0058] The range extending battery device can be connected at the alternating current interface of the electric vehicle. In the vehicle provided with the alternating current interface, the user can selectively use the range extending battery device to increase the cruising range of the vehicle by sending the range extending control instruction to the on board charger, use the electric energy of the range extending battery device, expand the application scenarios of the range extending battery device, and effectively improve the cruising ability of the electric vehicle.

[0059] According to some embodiments of the present application, the range extending control instruction comprises a connection confirmation signal and / or a control guide signal.

[0060] The connection confirmation signal is used to indicate the connection state between the range extending battery device 400 and the on board charger 110.

[0061] The control guide signal is used to control the charging process and / or discharging process between the range extending battery device 400 and the on board charger 110.

[0062] When the vehicle is charging, the CC (Control Connector) signal and the CP (Control Pilot Function) signal are usually transmitted. The CC signal is used to indicate the communication state between the charging device (for example, the alternating current charging pile) and the on board charger, and can be used to confirm whether the connection between the charging device and the vehicle is stable and abnormal. The CP signal is a communication signal between the charging device and the on board charger, and is used to control the charging and discharging process, for example, can be used to adjust the current output by the charging device, determine the power supply capacity of the charging device, and the like.

[0063] When the range extending battery device 400 is connected with the electric vehicle 1000, a signal similar to the above-mentioned signal can be used as a range extending control instruction to realize the communication between the range extending battery device 400 and the on-board charger 110. Among them, the connection confirmation signal can simulate the CC signal to indicate the connection state between the range extending battery device 400 and the on-board charger 110; the control guide signal can simulate the CP signal and be transmitted between the range extending battery device 400 and the on-board charger 110 to control the on-board charger 110 to use the alternating current output by the range extending battery device 400. In the scenario where the on-board charger 110 is a bidirectional charger, the on-board charger 110 can also be controlled to convert the direct current output by the power battery 100 in the electric vehicle 1000 into alternating current and transmit the converted alternating current to the range extending battery device 400 to charge the range extending battery 410.

[0064] By sending corresponding control instructions to the on-board charger through the controller in the range extending battery device, the on-board charger can be controlled to effectively use the electric energy of the range extending battery device and realize effective control of the power supply of the range extending battery device.

[0065] According to some embodiments of the present application, the AC / DC power converter 420 includes a bidirectional DC / AC converter.

[0066] The DC / AC converter (Alternating Current-Direct Current Converter, DC / AC for short) is a component that can convert alternating current and direct current. The bidirectional DC / AC converter can convert the input alternating current into direct current output, or convert the input direct current into alternating current output.

[0067] As shown in Figure 2 When the bidirectional DC / AC converter is used, the AC / DC power converter 420 can convert the direct current output by the range extending battery 410 into alternating current and transmit it to the first battery interface A. When alternating current is input from the first battery interface A, the AC / DC power converter 420 can also convert the alternating current into direct current input to the range extending battery 410 to realize charging of the range extending battery 410.

[0068] Using the bidirectional DC / AC converter, the range extending battery device can be used to supply power to the vehicle, and the power battery in the vehicle can also be used to charge the range extending battery, fully meeting the power demand in different scenarios.

[0069] According to some embodiments of the present application, the alternating current output by the AC / DC power converter 420 includes single-phase alternating current and / or three-phase alternating current.

[0070] For the on-board charger 110, it can have different types of AC interfaces, for example, it can have a single-phase 220-volt (V) AC interface, or it can have a three-phase 380V AC interface. According to the different configurations of the on-board charger 110, the AC-DC power converter 420 can output different types of AC power.

[0071] In some embodiments, the AC-DC power converter 420 can be provided with different switching channels, for example, a channel outputting single-phase 220V AC power and a channel outputting three-phase 380V AC power, and can be switched by the controller 430. In one example, the vehicle controller 200 in the electric vehicle 1000 will detect the AC interface type of the on-board charger 110, and send a corresponding control instruction to the range-extending battery device 400, according to which the AC-DC power converter 420 will switch to the output channel that matches the AC interface of the on-board charger 110, and transmit the output AC power to the on-board charger 110 through the first battery interface A. For example, if the on-board charger 110 uses a single-phase 220V AC interface, the AC-DC power converter 420 outputs single-phase 220V AC power; if the on-board charger 110 uses a three-phase 380V AC interface, the AC-DC power converter 420 outputs three-phase 380V AC power.

[0072] In some embodiments, the output power of the AC-DC power converter 420 can also be set to match the power of the on-board charger 110, for example, it can be set to a power level of 3.3 kilowatts (kW), 6.6kW, 11kW, 22kW, 40kW, etc.

[0073] The AC power output by the AC-DC power converter can be set according to the use requirements to meet different power consumption requirements, thereby expanding the application range of the range-extending battery device.

[0074] According to some embodiments of the present application, the second battery interface B includes a controller area network communication interface.

[0075] Controller area network (CAN) communication is a serial communication protocol for high-speed real-time data transmission. By setting the second battery interface B as a CAN communication interface, the range-extending control instruction can be transmitted through the CAN communication protocol.

[0076] It should be understood that in other embodiments, the second battery interface B can also be designed according to different use scenarios, for example, different communication interfaces can be used according to different transmission protocols.

[0077] Using the controller area network communication interface to transmit the range-extending control instruction can improve the transmission quality and increase the flexibility, real-time performance and reliability of the transmission process.

[0078] According to some embodiments of the present application, with reference to Figure 4 , the range-extending battery device 400 further comprises a third battery interface E.

[0079] The third battery interface E is connected with the controller 430, and is configured to connect the controller 430 with the battery management system 120 and / or the vehicle control unit 200 in the electric vehicle 1000 when the range-extending battery device 400 is connected with the electric vehicle 1000.

[0080] The battery management system (BMS for short) is an important component of the power battery device in the vehicle, and is used for monitoring, controlling and managing the power battery. The vehicle control unit (VCU for short) is a core electronic control unit for realizing the control decision of the whole vehicle.

[0081] The third battery interface E is used for transmitting various instructions sent by the controller 430 to the controller (for example, the BMS and / or the VCU, etc.) in the electric vehicle 1000 and various instructions sent by the controller in the electric vehicle 1000 to the range-extending battery device 400, etc. As shown in Figure 4 When the range-extending battery device 400 and the electric vehicle 1000 are connected, the controller 430 will be connected with the battery management system 120 and / or the vehicle control unit 200 through the third battery interface E (as shown in Figure 4 The dashed line in which the controller is connected with the battery management system 120 and the vehicle control unit 200 indicates that it can be connected with any one or both of them). It should be understood that, although in Figure 4 In other embodiments, any two or three of the first battery interface A, the second battery interface B and the third battery interface E can be integrated together using the same hardware interface. The present application does not limit this.

[0082] By connecting the controller with the battery management system and / or the vehicle control unit through the third battery interface, the controller in the range-extending battery device can be controlled according to the power consumption demand of the electric vehicle side, so that the range-extending battery device realizes the corresponding function, further meeting the user demand.

[0083] According to some embodiments of the present application, the third battery interface E comprises a controller area network communication interface.

[0084] Similar to the second battery interface B, the third battery interface E can also be set as a CAN communication interface, and the controller 430 and the battery management system 120 and / or the vehicle control unit 200 can communicate through the CAN communication protocol.

[0085] It should be understood that in other embodiments, the third battery interface E can also be designed according to different use scenarios, for example, different communication interfaces can be used according to different transmission protocols.

[0086] Using the controller area network communication interface to realize the communication between the controller and the battery management system and / or the vehicle controller can improve the transmission quality, and improve the flexibility, real-time performance and reliability of the transmission process.

[0087] According to some embodiments of the present application, the controller 430 is further configured to control the AC-DC power converter 420 to convert AC power at a first predetermined power output in response to receiving a first output instruction from the vehicle controller 200.

[0088] The vehicle controller 200 can calculate the power output by the power battery 100 in the electric vehicle 1000 and the power output by the range extending battery device 400 according to the power demand of the vehicle, so that the electric energy can be utilized to the maximum extent. After determining the power required to be output by the range extending battery device 400, the vehicle controller 200 will send a first output instruction to the range extending battery device 400, instructing the range extending battery device 400 to output AC power at a first predetermined power, i.e. the power required to be output by the range extending battery device 400 when the power supply efficiency is optimal. The controller 430 will control the AC-DC power converter 420 to convert AC power at a first predetermined power according to the first output instruction.

[0089] Outputting AC power at a predetermined power according to the instruction of the vehicle controller can fully meet the power demand of the electric vehicle and improve the discharge efficiency of the range extending battery device.

[0090] According to some embodiments of the present application, referring to Figure 5 , the range extending battery device 400 further comprises a fourth battery interface G.

[0091] The fourth battery interface G is connected with the AC-DC power converter 420 and is configured to transmit the AC power output by the AC-DC power converter 420.

[0092] As shown in Figure 5 , the range extending battery device 400 can also be provided with a fourth battery interface G. The fourth battery interface G can be used to expand the application scenarios of the range extending battery device 400, for example, the fourth battery interface G can be used in outdoor power supply, household power supply and other scenarios, and the user can use the electric energy in the range extending battery device 400 through the fourth battery interface G.

[0093] By providing the fourth battery interface, the electric energy of the range extending battery device can be used in different scenarios, expanding the application range of the range extending battery device.

[0094] Based on the same technical concept, the application provides a battery system. Referring to Figure 3 The battery system 500 comprises the range-extending battery device 400, the power battery 100 and the on-board charger 110 in the above embodiments.

[0095] The power battery 100 is arranged in the electric vehicle 1000 and is configured to output direct current.

[0096] The on-board charger 110 is arranged in the electric vehicle 1000 and is connected with the power battery 100. The on-board charger 110 is configured to charge the power battery 100 with the alternating current output by the AC-DC power converter 420 according to the range-extending control instruction.

[0097] In some embodiments, the range-extending battery device 400 is detachably connected to the electric vehicle 1000. As shown in Figure 3 The on-board charger 110 and the power battery 100 are arranged in the electric vehicle 1000. When the range-extending battery device 400 is connected to the electric vehicle 1000, the on-board charger 110 is connected with the range-extending battery device 400 through the first battery interface A and the second battery interface B. The embodiments of the battery system 500 can refer to the embodiments of the range-extending battery device 400, and the repeated parts will not be described herein.

[0098] By adding the range-extending battery device to the electric vehicle, the on-board charger can charge the power battery with the electric energy of the range-extending battery device, which can increase the cruising range of the vehicle and effectively improve the cruising ability of the electric vehicle.

[0099] According to some embodiments of the application, the on-board charger 110 is further configured to:

[0100] convert the direct current output by the power battery 100 into alternating current and output the converted alternating current;

[0101] In the case where the range-extending battery device 400 is connected to the electric vehicle 1000, the converted alternating current is transmitted to the AC-DC power converter 420 through the first battery interface A.

[0102] As described above, the on-board charger 110 can use a bidirectional charger. At this time, the on-board charger 110 can convert the alternating current output by the range-extending battery device 400 into direct current to charge the power battery 100; or convert the direct current output by the power battery 100 into alternating current and transmit the converted alternating current to the range-extending battery device 400 to charge the range-extending battery.

[0103] The on-board charger can realize charging the power battery with the range-extending battery device, and also can realize charging the range-extending battery with the electric energy of the power battery in the vehicle, which fully meets the power demand in different scenarios.

[0104] According to some embodiments of the present application, referring to Figure 4 , the battery system 500 further comprises the battery management system 120.

[0105] The battery management system 120 is arranged in the electric vehicle 1000 and is configured to connect with the controller 430 in the range-extended battery device 400 through the third battery interface E of the range-extended battery device 400 when the range-extended battery device 400 is connected with the electric vehicle 1000.

[0106] The connection relationship between the battery management system 120 and the controller 430 in the range-extended battery device 400 has been described in detail above, and will not be repeated here.

[0107] By connecting the controller with the battery management system through the third battery interface, the controller in the range-extended battery device can be controlled by the battery management system according to the power consumption demand of the electric vehicle side, so that the range-extended battery device realizes corresponding functions and further meets the user demand.

[0108] According to some embodiments of the present application, referring to Figure 4 , the battery system 500 further comprises the vehicle controller 200.

[0109] The vehicle controller 200 is arranged in the electric vehicle 1000 and is configured to connect with the controller 430 in the range-extended battery device 400 through the third battery interface E of the range-extended battery device 400 when the range-extended battery device 400 is connected with the electric vehicle 1000.

[0110] The connection relationship between the vehicle controller 200 and the controller 430 in the range-extended battery device 400 has been described in detail above, and will not be repeated here.

[0111] By connecting the controller with the vehicle controller through the third battery interface, the controller in the range-extended battery device can be controlled by the vehicle controller according to the power consumption demand of the electric vehicle side, so that the range-extended battery device realizes corresponding functions and further meets the user demand.

[0112] According to some embodiments of the present application, the vehicle controller 200 is configured to:

[0113] determine the output power of the AC-DC power converter 420;

[0114] According to the output power, a first output instruction is sent to the range-extended battery device 400. The first output instruction instructs the AC-DC power converter 420 to output the converted AC power at a first predetermined power.

[0115] As described above, the vehicle controller 200 can calculate the power output by the power battery 100 and the power output by the range-extending battery device 400 in the electric vehicle 1000 according to the power demand of the vehicle, so that the power in the power battery 100 and the range-extending battery device 400 can be utilized to the maximum extent. In one example, the vehicle controller 200 can determine the power required to be output by the range-extending battery device 400 according to the power required by the motor 300, the discharge efficiency of the AC / DC power converter 420, and other factors.

[0116] After determining the output power, the vehicle controller 200 will send a first output instruction, so that the AC / DC power converter 420 in the range-extending battery device 400 outputs AC power at a first predetermined power.

[0117] In some embodiments, the on-board charger 110 is a bidirectional charger, which can output AC power to the range-extending battery device 400, thereby charging the range-extending battery 410. In this scenario, when the electric vehicle 1000 is being charged by a DC charging post or an AC charging post, the vehicle controller 200 can also calculate the power for charging the power battery 100 and the power for charging the range-extending battery device 400 according to the output power of the DC charging post or the AC charging post, the maximum charging power of the power battery 100, the maximum charging power of the range-extending battery device 400, and other factors.

[0118] The vehicle controller can determine the power required to be output by the AC / DC power converter, and send an instruction to the range-extending battery device to control the AC / DC power converter to output AC power at a predetermined power, so that the power demand of the electric vehicle can be fully met, and the power utilization rate can be improved.

[0119] According to some embodiments of the present application, with reference to Figure 3 and Figure 4 , the battery system 500 further comprises a first vehicle interface C.

[0120] The first vehicle interface C is arranged in the electric vehicle 1000 and connected with the on-board charger 110. The first vehicle interface C is used to connect with the first battery interface A so that the on-board charger 110 is connected with the AC / DC power converter 420.

[0121] As shown in Figure 3 and Figure 4 , the first vehicle interface C is arranged in the electric vehicle 1000 and can be matched with the first battery interface A in the range-extending battery device 400, for example, the first vehicle interface C and the first battery interface A can be arranged in the form of plugs and sockets that can be plugged into each other, or two sockets that can be connected by an adapter, and the like.

[0122] In some embodiments, the first vehicle interface C may be located at the AC interface of the electric vehicle 1000. The AC interface of the electric vehicle 1000 includes an AC charging interface (e.g., an AC charging socket) and the first vehicle interface C. The electric vehicle 1000 can be connected to an AC charging device (e.g., an AC charging station) via the AC charging interface, and can also be connected to the range extender battery device 400 via the first vehicle interface C. In one example, the first vehicle interface C may be integrated into the AC charging socket of the electric vehicle 1000.

[0123] In some embodiments, such as Figure 4 As shown, for the second battery interface B and the third battery interface E, the electric vehicle 1000 can also have corresponding second vehicle interfaces D and third vehicle interfaces F. It should be understood that in scenarios where any two or three of the first battery interface A, second battery interface B, and third battery interface E are integrated into one interface, the corresponding vehicle interfaces among the first vehicle interfaces C, second vehicle interfaces D, and third vehicle interfaces F should also be integrated into a matching interface.

[0124] By setting a first vehicle interface that matches the first battery interface, energy transfer between the range extender battery device and the electric vehicle can be realized, increasing the vehicle's driving range and improving energy utilization.

[0125] A specific embodiment of this application is described below. It should be understood that this specific embodiment is described for illustrative purposes only and should not be construed as limiting the scope of this application.

[0126] like Figure 4 As shown, the range extender battery device 400 includes a range extender battery 410, an AC / DC power converter 420, and a controller 430. The AC / DC power converter 420 is connected to the range extender battery 410 and can convert the DC power output from the range extender battery 410 into AC power. The electric vehicle 1000 includes an on-board charger 110, a power battery 100, a battery management system 120, and a vehicle controller 200.

[0127] like Figure 5As shown, the range extending battery device 400 is also provided with a first battery interface A, a second battery interface B, a third battery interface E and a fourth battery interface G. The electric vehicle 1000 is provided with a first vehicle interface C, a second vehicle interface D and a third vehicle interface F corresponding to the first battery interface A, the second battery interface B and the third battery interface E respectively. When the battery interface and the corresponding vehicle interface are connected, the range extending battery device 400 is connected with the electric vehicle 1000. At this time, the AC-DC power converter 420 transmits the converted AC power to the on-board charger 110 via the first battery interface A, and the controller 430 sends the range extending control instruction to the on-board charger 110 via the second battery interface B, and the on-board charger 110 can use the AC power to convert it into DC power and charge the power battery 100.

[0128] The controller 430 is connected with the battery management system 120 and the vehicle controller 200 in the electric vehicle 1000 via the third battery interface E. The vehicle controller 200 can calculate the power output by the power battery 100 in the electric vehicle 1000 and the power output by the range extending battery device 400 according to the power demand of the vehicle, so that the electric energy in the power battery 100 and the range extending battery device 400 can be utilized to the maximum extent. After determining the output power, the vehicle controller 200 sends a first output instruction to the controller 430, so that the controller 430 controls the AC-DC power converter 420 in the range extending battery device 400 to output AC power at a first predetermined power.

[0129] The fourth battery interface G can be used in outdoor power supply, household power supply and other scenarios, and the user can use the electric energy in the range extending battery device 400 through the fourth battery interface G.

[0130] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the specification of the present application. Especially, as long as there is no structural conflict, each technical feature mentioned in the embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A range extending battery device, characterized by, The range extender battery device comprises: a range extender battery configured to output direct current; an AC / DC power converter connected with the range extender battery and configured to convert the direct current output by the range extender battery into alternating current and output the converted alternating current; a first battery interface connected with the AC / DC power converter and configured to connect the AC / DC power converter with an on-board charger in an electric vehicle when the range extender battery device is connected with the electric vehicle; a controller configured to send a range extender control instruction for instructing the on-board charger to charge a power battery in the electric vehicle using the alternating current output by the AC / DC power converter; and a second battery interface connected with the controller and configured to transmit the range extender control instruction to the on-board charger when the range extender battery device is connected with the electric vehicle. The range extender control instruction comprises:

2. The range extended battery device of claim 1, wherein a connection confirmation signal for indicating a connection state between the range extender battery device and the on-board charger; and / or a control guide signal for controlling a charging process and / or a discharging process between the range extender battery device and the on-board charger. The AC / DC power converter comprises a bidirectional DC / AC converter.

3. The range extending battery device according to claim 1 or 2, characterized by The alternating current output by the AC / DC power converter comprises single-phase alternating current and / or three-phase alternating current.

4. The range extended battery device according to claim 1 or 2, characterized by, The second battery interface comprises a controller area network communication interface.

5. The range extended battery device according to claim 1 or 2, characterized by, The range extender battery device further comprises:

6. The range extended battery device according to claim 1 or 2, characterized by, a third battery interface connected with the controller and configured to connect the controller with a battery management system and / or a vehicle control unit in the electric vehicle when the range extender battery device is connected with the electric vehicle. The third battery interface comprises a controller area network communication interface.

7. The range extended battery device of claim 6, wherein The controller is further configured to:

8. The range extended battery device of claim 6, wherein, control the AC / DC power converter to output the converted alternating current at a first predetermined power in response to receiving a first output instruction from the vehicle control unit. The range extender battery device further comprises:

9. The range extended battery device according to claim 1 or 2, characterized by, a fourth battery interface connected with the AC / DC power converter and configured to transmit the alternating current output by the AC / DC power converter. The range extender battery device comprises:

10. A battery system characterized by, the range extender battery device according to any one of claims 1-9; a power battery disposed in an electric vehicle and configured to output direct current; and an on-board charger disposed in the electric vehicle and connected with the power battery, the on-board charger being configured to charge the power battery using the alternating current output by the AC / DC power converter according to the range extender control instruction. The on-board charger is further configured to:

11. The battery system of claim 10, wherein, convert the direct current output by the power battery into alternating current and output the converted alternating current; and transmit the converted alternating current to the AC / DC power converter through the first battery interface when the range extender battery device is connected with the electric vehicle. The range extender battery device further comprises:

12. The battery system according to claim 10 or 11, characterized by, a battery management system disposed in the electric vehicle and configured to connect with the controller in the range extender battery device through a third battery interface of the range extender battery device when the range extender battery device is connected with the electric vehicle. The range extender battery device further comprises:

13. The battery system of claim 10 or 11, wherein, ​ A vehicle controller is disposed in the electric vehicle and is configured to connect with the controller in the range-extended battery device through a third battery interface of the range-extended battery device when the range-extended battery device is connected with the electric vehicle.

14. The battery system of claim 13, wherein, The vehicle controller is configured to: determine an output power of the AC / DC power converter; and send a first output instruction to the range-extended battery device according to the output power, the first output instruction instructing the AC / DC power converter to output converted AC power at a first predetermined power.

15. The battery system of claim 10 or 11, wherein, Further comprising: a first vehicle interface disposed in the electric vehicle and connected with the on-board charger, the first vehicle interface being used to connect with the first battery interface so as to connect the on-board charger with the AC / DC power converter.

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