New energy vehicle control system and new energy vehicle

Abstract

The utility model discloses a control system of a new energy vehicle. The control system of the new energy vehicle comprises an energy management system, a storage battery sensor and a switching circuit. The energy management system, the storage battery sensor and the switching circuit are all connected with a storage battery of the new energy vehicle; the switching circuit is connected in series to a power supply path of the storage battery for each load of the new energy vehicle; the load at least comprises a thermal runaway processing type load; the storage battery sensor is also connected with the energy management system; the storage battery sensor is used for measuring residual electric quantity of a storage battery and sending the residual electric quantity to the energy management system; and the energy management system is used for determining whether to supply power to the thermal runaway processing load through a switching circuit at least according to the residual electric quantity. According to the technical scheme, electricity of the storage battery can be effectively utilized to supply power to the energy management system, and safety of the whole vehicle during thermal runaway is guaranteed.

Description

Technical Field

[0001] The present application relates to the technical field of battery power management, and in particular to a control system of a new energy vehicle and a new energy vehicle. Background Art

[0002] At present, new energy vehicles are increasingly being used. New energy vehicles include high-voltage battery packs and storage batteries. The high-voltage battery packs are used to power the motors of new energy vehicles, which drive the new energy vehicles. Storage batteries are used to power the loads of new energy vehicles, such as lights, air conditioners, energy management systems, and vehicle controllers.

[0003] When the high-voltage battery pack of a new energy vehicle has thermal runaway, the new energy vehicle will stop and the energy management system will handle the thermal runaway, such as issuing alarms, cooling, and spraying.

[0004] However, the energy management system is powered by a battery. When the battery power is low, it affects the operation of the battery management system, which in turn may affect the safety of the entire vehicle. Utility Model Content

[0005] In view of this, the present application provides a control system for a new energy vehicle and a new energy vehicle, which can effectively utilize the power of the battery to power the energy management system and ensure the safety of the entire vehicle during thermal runaway.

[0006] The present application provides a control system for a new energy vehicle, including: an energy management system, a battery sensor and a switch circuit;

[0007] The energy management system, the battery sensor and the switch circuit are all connected to the battery of the new energy vehicle; the switch circuit is connected in series to the power supply path of the battery for each load of the new energy vehicle; the load at least includes a thermal runaway processing load;

[0008] The battery sensor is also connected to the energy management system, and the battery sensor is used to measure the remaining power of the battery and send it to the energy management system;

[0009] The energy management system is used to determine whether to supply power to the thermal runaway processing type load through the switching circuit at least according to the remaining power.

[0010] In a possible implementation, the energy management system includes a battery management system and a high-voltage battery pack thermal runaway processing system;

[0011] The battery management system is connected to the switch circuit, the battery, the battery sensor and the high-voltage battery pack thermal runaway processing system;

[0012] The battery sensor is used to send the remaining power of the battery to the battery management system;

[0013] The high-voltage battery pack thermal runaway processing system is used to send the high-voltage battery pack thermal runaway level to the battery management system;

[0014] The battery management system is used to control the switch circuit according to the remaining power and the thermal runaway level of the high-voltage battery pack.

[0015] In a possible implementation manner, the switch circuit includes a first switch and a second switch;

[0016] The first end and the second end of the first switch are connected to the battery and the thermal runaway handling load respectively;

[0017] The first end and the second end of the second switch are connected to the battery and a non-thermal runaway handling load respectively.

[0018] In a possible implementation, the battery management system is used to control the second switch to be disconnected when the new energy vehicle is stopped.

[0019] In a possible implementation, the battery management system is used to control the second switch to be disconnected when the remaining power is less than a first power threshold.

[0020] In one possible implementation, the battery management system is used to not disconnect the second switch when the remaining power is greater than or equal to a first power threshold and less than a second power threshold, and the thermal runaway level of the high-voltage battery pack is a first level; and the first power threshold is less than the second power threshold.

[0021] In one possible implementation, the battery management system is used to disconnect the second switch when the remaining power is greater than or equal to a first power threshold and less than a second power threshold, and the thermal runaway level of the high-voltage battery pack is at the second level or the third level; the first power threshold is less than the second power threshold; and the second level is lower than the third level.

[0022] In one possible implementation, the battery management system is used to disconnect the second switch when the remaining power is greater than or equal to the second power threshold and the thermal runaway level of the high-voltage battery pack is the third level; not disconnect the second switch when the remaining power is greater than or equal to the second power threshold and the thermal runaway level of the high-voltage battery pack is the first level or the second level; the first level is lower than the second level, and the second level is lower than the third level.

[0023] In a possible implementation manner, the switch circuit further includes: a third switch;

[0024] The first end and the second end of the third switch are respectively connected to the battery and the high-voltage battery pack thermal runaway processing system.

[0025] The present application also provides a new energy vehicle, including the control system of the new energy vehicle introduced above, and also including a high-voltage battery pack and a storage battery; the high-voltage battery pack provides power for the new energy vehicle, and the storage battery provides power for the control system.

[0026] It can be seen that this application has the following beneficial effects:

[0027] The control system provided in the embodiment of the present application adds a switch circuit between each load and the battery. The energy management system can control the state of the switch circuit according to the remaining power of the battery, thereby ensuring that in the event of thermal runaway, the power supply of the thermal runaway processing load is prioritized. For example, if the remaining power of the battery is sufficient, each load can be powered, that is, the switch circuit ensures that the power supply path of each load is connected. When the remaining power of the battery is less, unimportant loads can be powered off, and the power supply of the thermal runaway processing load can be guaranteed as much as possible, that is, the switch circuit can disconnect a part of the loads to ensure that the power supply path of the thermal runaway processing load is connected; when the remaining power of the battery is particularly small, the thermal runaway processing load can be powered off, and only the energy management system can be powered. The energy management system performs thermal runaway processing, so that the energy management system can have enough time to handle thermal runaway and ensure the safety of new energy vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic diagram of a control system for a new energy vehicle provided in an embodiment of the present application;

[0029] Figure 2 A schematic diagram of an energy management system provided in an embodiment of the present application;

[0030] Figure 3 A schematic diagram of a control system of another new energy vehicle provided in an embodiment of the present application;

[0031] Figure 4 A schematic diagram of a new energy vehicle provided in an embodiment of the present application. DETAILED DESCRIPTION

[0032] Traditionally, the battery has been connected to various loads in the new energy vehicle and has been supplying power to each load. When the new energy vehicle has thermal runaway, the battery may be insufficient and unable to supply power to the thermal runaway processing loads, resulting in insufficient time to handle the thermal runaway, causing greater safety accidents.

[0033] The control system provided in the embodiment of the present application adds a switch circuit between each load and the battery. The energy management system can control the state of the switch circuit according to the remaining power of the battery, thereby ensuring that in the event of thermal runaway, the power supply of the thermal runaway processing load is prioritized. For example, if the remaining power of the battery is sufficient, each load can be powered, that is, the switch circuit ensures that the power supply path of each load is connected. When the remaining power of the battery is less, unimportant loads can be powered off, and the power supply of the thermal runaway processing load can be guaranteed as much as possible, that is, the switch circuit can disconnect a part of the loads to ensure that the power supply path of the thermal runaway processing load is connected; when the remaining power of the battery is particularly small, the thermal runaway processing load can be powered off, and only the energy management system can be powered. The energy management system performs thermal runaway processing, so that the energy management system can have enough time to handle thermal runaway and ensure the safety of new energy vehicles.

[0034] Among them, the energy management system's handling of thermal runaway includes alarms, cooling, and spraying.

[0035] Thermal runaway processing loads include wireless terminal systems that can send warning text messages to car owners, modules that can control vehicle unlocking, etc.

[0036] Thermal runaway handling loads are electrical components that handle thermal runaway events when the high-voltage battery pack is in thermal runaway, ensuring the safety of the high-voltage battery pack and the vehicle, including but not limited to lights, horns, air conditioners, fire extinguishers, and coolers.

[0037] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the embodiments of the present application are further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0038] See also Figure 1 , which is a schematic diagram of a control system for a new energy vehicle provided in an embodiment of the present application.

[0039] The control system of a new energy vehicle provided in an embodiment of the present application includes: an energy management system 100 , a battery sensor 200 and a switch circuit 300 .

[0040] The energy management system 100, the battery sensor 200 and the switch circuit 300 are all connected to the battery 400 of the new energy vehicle. The switch circuit 300 is connected in series to the power supply path of the battery 400 for each load of the new energy vehicle. The load at least includes a thermal runaway processing load. The battery sensor 200 is also connected to the energy management system 100.

[0041] The battery sensor 200 is used to measure the remaining power SOC of the battery 400 and send the remaining power SOC to the energy management system 100 .

[0042] The energy management system 100 is used to determine whether to supply power to a thermal runaway processing load through a switch circuit at least according to the remaining power.

[0043] When a new energy vehicle has a thermal runaway, the energy management system 100 first disconnects the power supply to the non-thermal runaway handling loads through the switch circuit 300. Since the vehicle has stopped when the thermal runaway occurs, the non-thermal runaway handling loads do not need to work. The energy management system 100 then determines whether to supply power to the thermal runaway handling loads based on the remaining battery power. When the remaining battery power is very low, the thermal runaway handling loads may not be powered, and only the energy management system may be powered. The energy management system performs thermal runaway processing, so that the energy management system has enough time to handle the thermal runaway and ensure the safety of the new energy vehicle.

[0044] For example, in a possible implementation, the energy management system 100 can divide the SOC into at least two thresholds: a first power threshold SOC1 and a second power threshold SOC2, wherein SOC1 is less than SOC2. The energy management system 100 stores different levels when thermal runaway occurs in the new energy vehicle, and different levels correspond to different degrees of thermal runaway severity. The embodiment of the present application does not specifically limit the reference amount of the assessment level. For example, the level can be assessed by current. It should be understood that the assessment level belongs to mature technology. The assessment of the level and the division of the number of levels belong to the prior art, and this application does not make a specific introduction. For the convenience of understanding, the following is divided into three different thermal runaway levels only by different currents. The corresponding three levels are the first level I1, the second level I2 and the third level I3, wherein I1 is less than I2, and I2 is less than I3, that is, the larger the current, the higher the level, and the more serious the thermal runaway. It should be understood that the above I1-I3 only represent the current level, not the current size. For example, the current interval can be divided. As long as the thermal runaway current is in the corresponding interval, it belongs to the corresponding level. The current corresponding to the above level can be an interval value.

[0045] The embodiment of the present application sets the priority of the battery for powering the entire vehicle load according to the remaining power of the battery of the new energy vehicle and the size of the current required for corresponding processing when the new energy vehicle has thermal runaway. Therefore, when the high-voltage battery pack of the new energy vehicle has thermal runaway, the duration of the thermal treatment is extended, the reliability of the thermal runaway processing system of the new energy vehicle is improved, and the safety of the entire vehicle is thereby improved.

[0046] See also Figure 2 , which is a schematic diagram of an energy management system provided in an embodiment of the present application.

[0047] The energy management system of the control system provided in the embodiment of the present application includes: a battery management system 101 and a high-voltage battery pack thermal runaway processing system 102. It should be understood that the embodiment of the present application does not limit the specific implementation of the battery management system 101. For example, a hardware-based battery management system (Battery Management System, BMS) can be used, including a monitoring circuit, a control circuit, and a protection circuit. The present application example also does not limit the implementation of the high-voltage battery pack thermal runaway processing system 102. For example, different cooling systems can be used, including liquid cooling systems and air cooling systems.

[0048] The battery management system 101 is connected to the switch circuit 300, the battery 400, the battery sensor 200 and the high-voltage battery pack thermal runaway processing system 102. The thermal runaway processing system 102 is also connected to the switch circuit 300 and the thermal runaway processing load.

[0049] The high-voltage battery pack thermal runaway processing system 102 is used to send the high-voltage battery pack thermal runaway level to the battery management system 101. For example, the thermal runaway level can be a current level. The battery management system 101 is used to control the switch circuit 300 according to the remaining power and the high-voltage battery pack thermal runaway level. The first power threshold of the remaining power is less than the second power threshold, and the first level of the thermal runaway level is lower than the second level and lower than the third level.

[0050] In a possible implementation, when the remaining power is less than the first power threshold, the battery management system 101 controls the switch circuit to only power the high-voltage battery pack thermal runaway processing system 102. When the remaining power is greater than or equal to the first power threshold and less than the second power threshold, and the thermal runaway level of the high-voltage battery pack is at the first level, the battery management system 101 controls the switch circuit to power the high-voltage battery pack thermal runaway processing system 102 and the thermal runaway processing load. When the remaining power is greater than or equal to the first power threshold and less than the second power threshold, and the thermal runaway level of the high-voltage battery pack is at the second level or the third level, the battery management system 101 controls the switch circuit to only power the high-voltage battery pack thermal runaway processing system 102. When the remaining power is greater than or equal to the second power threshold, and the thermal runaway level of the high-voltage battery pack is at the third level, the battery management system 101 controls the switch circuit to only power the high-voltage battery pack thermal runaway processing system 102. When the remaining power is greater than or equal to the second power threshold, and the thermal runaway level of the high-voltage battery pack is at the first level or the second level, the battery management system 101 controls the switch circuit to power the high-voltage battery pack thermal runaway processing system 102 and the thermal runaway processing load.

[0051] Specifically, after the energy management system 100 receives the SOC from the battery sensor 200, the energy management system 100 determines the size of the SOC. If the SOC is less than SOC1, the energy management system 100 does not need to determine the thermal runaway current level, and directly controls the switch circuit 300 to only power itself. When the SOC is between SOC1 and SOC2, the energy management system 100 determines the thermal runaway current level. If the thermal runaway current is at the first level I1, the energy management system 100 controls the switch circuit 300 to power itself and the thermal runaway processing load. If the thermal runaway current is at the first level, the second level I2, or the third level I3, the energy management system 100 controls the switch circuit 300 to only power itself. If the SOC is greater than SOC2, the energy management system 100 determines the thermal runaway current level. If the thermal runaway current is at the first level I1 or the second level I2, the energy management system 100 controls the switch circuit 300 to power itself and the thermal runaway processing load. If the thermal runaway current is between the first level and the third level I3, the energy management system 100 controls the switch circuit 300 to only supply power to itself.

[0052] The battery management system 101 is also used to control the switch circuit 300 to disconnect the power supply to the non-thermal runaway processing load when the new energy vehicle is stopped.

[0053] The energy management system in the embodiment of the present application includes two parts: a battery management system and a high-voltage battery pack thermal runaway processing system. This separation design allows the battery management system to focus more on the management of power supply to different parts, and the high-voltage battery pack thermal runaway processing system to focus more on the thermal management, monitoring and emergency response of the high-voltage battery pack. Each system can be optimized according to its functional requirements, thereby extending the time for emergency processing when a thermal runaway occurs in the vehicle, thereby improving the overall reliability and safety of the energy management system.

[0054] See also Figure 3 , which is a schematic diagram of another control system provided in an embodiment of the present application.

[0055] In the embodiment of the present application, an energy management system is introduced as an example, which includes a two-part battery management system and a high-voltage battery pack thermal runaway processing system.

[0056] The switch circuit of the control system provided in the embodiment of the present application, the present application defines the specific manner of the switch circuit, Figure 3 It is only a simple illustration that the switch circuit includes: a first switch S1 and a second switch. It should be understood that the embodiment of the present application does not specifically limit the specific implementation of the first switch S1 and the second switch S2. For example, a relay or the like can be used to implement the switch function.

[0057] The first end and the second end of the first switch S1 are connected to the battery and the thermal runaway handling load respectively. The first end and the second end of the second switch S2 are connected to the battery and the non-thermal runaway handling load respectively.

[0058] In addition, in order to achieve power supply control for the high-voltage battery pack thermal runaway processing system, the switch circuit may further include a third switch S3, wherein the first end and the second end of the third switch S3 are respectively connected to the battery and the high-voltage battery pack thermal runaway processing system.

[0059] When the new energy vehicle stops, the second switch S2 is disconnected. Since switch S3 is connected to the high-voltage battery pack thermal runaway processing system, switch S3 is generally normally closed. When the new energy vehicle stops and there is no thermal runaway, the third switch S3 can be controlled to be disconnected to save energy. When the battery management system determines that the current thermal runaway level only supplies power to the high-voltage battery pack thermal runaway processing system, the first switch S1 and the second switch S2 are both disconnected. When the battery management system determines that the current thermal runaway level can additionally supply power to thermal runaway processing loads, the first switch S1 is closed and the second switch S2 is disconnected. When the battery management system determines that the current thermal runaway level can supply power to thermal runaway processing loads and non-thermal runaway processing loads, the first switch S1 and the second switch S2 are both closed.

[0060] The switch circuit of this embodiment provides a switch for each different load in the thermal runaway processing process of the new energy vehicle. Therefore, when thermal runaway occurs in the new energy vehicle, the simple coordination of different switches can extend the thermal runaway processing time of the high-voltage battery pack thermal runaway processing system as much as possible according to the remaining power of the battery, thereby improving the safety of the new energy vehicle.

[0061] Based on the control system of a new energy vehicle provided in the above embodiment, the embodiment of the present application also provides a new energy vehicle, which is described in detail below with reference to the accompanying drawings.

[0062] See also Figure 4 , which is a schematic diagram of a new energy vehicle provided in an embodiment of the present application.

[0063] The new energy vehicle provided in the embodiment of the present application includes the control system 401 of the new energy vehicle introduced in the above embodiment, and also includes a high-voltage battery pack 400 and a storage battery 403; the high-voltage battery pack 400 provides power for the new energy vehicle, and the storage battery provides power for the control system 401.

[0064] The new energy vehicle provided in the embodiment of the present application adopts the control system introduced in the above embodiment. When a high-voltage battery pack has a thermal runaway, it can determine whether to continue to supply power to each load through the remaining power of the battery and the switching circuit, and try to reserve enough power to power the thermal treatment system, providing a longer thermal runaway treatment time, thereby enhancing the safety of the entire vehicle and thereby improving customer satisfaction.

[0065] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referred to each other. For the system or device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part description.

[0066] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A control system for a new energy vehicle, characterized in that: include: Energy management systems, battery sensors and switching circuits; The energy management system, the battery sensor and the switch circuit are all connected to the battery of the new energy vehicle; the switch circuit is connected in series to the power supply path of the battery for each load of the new energy vehicle; the load at least includes a thermal runaway processing load; The battery sensor is also connected to the energy management system, and the battery sensor is used to measure the remaining power of the battery and send it to the energy management system; The energy management system is used to determine whether to supply power to the thermal runaway processing type load through the switching circuit at least according to the remaining power.

2. The control system according to claim 1, characterized in that: The energy management system includes a battery management system and a high-voltage battery pack thermal runaway processing system; The battery management system is connected to the switch circuit, the battery, the battery sensor and the high-voltage battery pack thermal runaway processing system; The battery sensor is used to send the remaining power of the battery to the battery management system; The high-voltage battery pack thermal runaway processing system is used to send the high-voltage battery pack thermal runaway level to the battery management system; The battery management system is used to control the switch circuit according to the remaining power and the thermal runaway level of the high-voltage battery pack.

3. The control system according to claim 2, characterized in that: The switch circuit includes a first switch and a second switch; The first end and the second end of the first switch are connected to the battery and the thermal runaway handling load respectively; The first end and the second end of the second switch are connected to the battery and a non-thermal runaway handling load respectively.

4. The control system according to claim 3, characterized in that: The battery management system is used to control the second switch to be disconnected when the new energy vehicle is stopped.

5. The control system according to claim 4, characterized in that: The battery management system is used to control the second switch to be disconnected when the remaining power is less than a first power threshold.

6. The control system according to claim 4, characterized in that: The battery management system is used for not disconnecting the second switch when the remaining power is greater than or equal to a first power threshold and less than a second power threshold, and the thermal runaway level of the high-voltage battery pack is the first level; and the first power threshold is less than the second power threshold.

7. The control system according to claim 6, characterized in that: The battery management system is used to disconnect the second switch when the remaining power is greater than or equal to a first power threshold and less than a second power threshold, and the thermal runaway level of the high-voltage battery pack is at the second level or the third level; the first power threshold is less than the second power threshold; and the second level is lower than the third level.

8. The control system according to claim 4, characterized in that: The battery management system is used to disconnect the second switch when the remaining power is greater than or equal to the second power threshold and the thermal runaway level of the high-voltage battery pack is the third level; not to disconnect the second switch when the remaining power is greater than or equal to the second power threshold and the thermal runaway level of the high-voltage battery pack is the first level or the second level; the first level is lower than the second level, and the second level is lower than the third level.

9. The control system according to claim 3, characterized in that: The switch circuit further includes: a third switch; The first end and the second end of the third switch are respectively connected to the battery and the high-voltage battery pack thermal runaway processing system.

10. A new energy vehicle, characterized in that: A control system for a new energy vehicle comprising any one of claims 1 to 9, further comprising a high-voltage battery pack and a storage battery; the high-voltage battery pack provides power for the new energy vehicle, and the storage battery provides power for the control system.

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