阅读说明：本技术 电池管理系统及车辆 (Battery management system and vehicle ) 是由 倪四桥 陈奇志 易海 姚常瓦 鲁光 于 2020-07-28 设计创作，主要内容包括：本发明实施例提供了一种电池管理系统及车辆,上述电池管理系统应用于车辆,所述车辆包括动力电池与蓄电池,所述电池管理系统包括：传感器组件,所述传感器组件用于采集所述动力电池的传感数据；第一控制器,所述第一控制器与所述传感器组件电连接；隔离组件；低压组件,所述低压组件包括电源模块、通讯模块以及电池控制单元,所述电源模块与所述通讯模块均通过所述隔离组件连接至所述第一控制器,所述电池控制单元与所述通讯模块电连接,所述蓄电池用于向所述电源模块供电。本发明实施例可以减少隔离结构的数量,降低电池管理系统的制造成本。(The embodiment of the invention provides a battery management system and a vehicle, wherein the battery management system is applied to the vehicle, the vehicle comprises a power battery and a storage battery, and the battery management system comprises: the sensor assembly is used for acquiring sensing data of the power battery; a first controller electrically connected to the sensor assembly; an isolation component; the low-voltage component comprises a power module, a communication module and a battery control unit, the power module and the communication module are connected to the first controller through the isolation component, the battery control unit is electrically connected with the communication module, and the storage battery is used for supplying power to the power module. The embodiment of the invention can reduce the number of the isolation structures and reduce the manufacturing cost of the battery management system.)

1. A battery management system is applied to a vehicle, the vehicle comprises a power battery and a storage battery, and the battery management system is characterized by comprising:

the sensor assembly (100) is used for acquiring sensing data of the power battery;

a first controller (200), the first controller (200) being electrically connected to the sensor assembly (100);

an isolation assembly (300);

the low-voltage assembly (400) comprises a power module (410), a communication module (420) and a battery control unit (430), wherein the power module (410) and the communication module (420) are connected to the first controller (200) through the isolation assembly (300), the battery control unit (430) is electrically connected with the communication module (420), and the storage battery is used for supplying power to the power module (410).

2. The battery management system of claim 1, wherein the sensor assembly (100) comprises a first current sensor (110) and a second current sensor (120), the first current sensor (110) and the second current sensor (120) being connected to a bus of the power battery.

3. The battery management system of claim 2, wherein the first current sensor (110) is a shunt current sensor and the second current sensor (120) is a hall current sensor.

4. The battery management system of claim 1, wherein the isolation assembly (300) comprises a power isolation circuit (310) and a digital isolation circuit (320), wherein the power module (410) is connected to the first controller (200) via the power isolation circuit (310), and wherein the communication module (420) is connected to the first controller (200) via the digital isolation circuit (320).

5. The battery management system of claim 1, wherein the communication module (420) comprises a CAN transceiver.

6. The battery management system of claim 1, wherein the sensor assembly (100) comprises a voltage acquisition module (130), wherein voltage sampling points of the voltage acquisition module (130) are located at least one of:

the power battery is used for being connected to a first positive bus of the quick charging structure;

the power battery is used for being connected to a second positive bus of the vehicle-mounted charger;

the power battery is used for being connected to a third positive bus of the second controller;

and the negative bus of the power battery.

7. The battery management system of claim 6, wherein the third positive bus bar comprises a first bus-section, a second bus-section, and a third bus-section;

a first end of the first bus-section is connected to the positive pole of a power cell, a second end of the first bus-section is connected to a first end of the second bus-section through a first resistor, a second end of the second bus-section is connected to a first end of the third bus-section through a fuse, and a second end of the third bus-section is connected to the second controller;

a voltage sampling point on the third positive bus is located on at least one of the first, second and third bus-sections.

8. The battery management system according to claim 6, wherein the sensor assembly (100) further comprises a relay sticking detection module (140), wherein an input end of the relay sticking detection module (140) is connected to the voltage acquisition module (130), and an output end of the relay sticking detection module (140) is connected to the first controller (200).

9. The battery management system of claim 1, wherein the sensor assembly (100) further comprises an insulation detection module (150), the insulation detection module (150) being electrically connected to the first controller (200).

10. A vehicle, characterized by comprising a power cell (510), a storage cell (520) and a battery management system according to any one of claims 1 to 9;

the sensor assembly (100) of the battery management system is connected to the power battery (510), and the power module (410) of the low-voltage assembly (400) of the battery management system is connected to the storage battery (520).

Technical Field

The invention relates to the technical field of battery management, in particular to a battery management system and a vehicle.

Background

As is well known, a Battery Management System (BMS) is a System for monitoring and controlling batteries in products such as electric vehicles. The BMS includes a high voltage area generally corresponding to components for detecting battery operation current, voltage, etc., and a low voltage area generally corresponding to components for regulation control, communication, etc.

In general, an isolation structure is required to be arranged between a high-voltage area and a low-voltage area to ensure the overall safety of the BMS; however, in the related art, the components in the BMS are generally spatially arranged in association according to the implemented functions, resulting in more interleaving between the high voltage area and the low voltage area, and thus, the number of the isolation structures is large, and the manufacturing cost of the BMS is high.

Disclosure of Invention

The embodiment of the invention provides a battery management system and a vehicle, and aims to solve the problems that the number of isolation structures in an existing BMS is large, and the manufacturing cost of the BMS is high.

In order to solve the technical problem, the invention is realized as follows:

in a first aspect, an embodiment of the present invention provides a battery management system, which is applied to a vehicle, where the vehicle includes a power battery and a storage battery, and the battery management system includes:

the sensor assembly is used for acquiring sensing data of the power battery;

a first controller electrically connected to the sensor assembly;

an isolation component;

the low-voltage component comprises a power module, a communication module and a battery control unit, the power module and the communication module are connected to the first controller through the isolation component, the battery control unit is electrically connected with the communication module, and the storage battery is used for supplying power to the power module.

In a second aspect, an embodiment of the present invention further provides a vehicle, including a power battery, a storage battery, and the above battery management system;

the sensor assembly of the battery management system is connected to the power battery, and the power module of the low-voltage assembly of the battery management system is connected to the storage battery.

The battery management system provided by the embodiment of the invention comprises a sensor assembly, a first controller, an isolation assembly and a low-voltage assembly; the low-voltage assembly comprises a power module, a communication module and a battery control unit; the first controller is electrically connected with the sensor assembly, the power supply module and the communication module are connected with the first controller through the isolation assembly, and the battery control unit is connected with the communication module. In this embodiment, power module and communication module are kept apart through isolation assembly and high-pressure part, and battery control unit then directly is connected with communication module, and then need not to do alone at battery control unit again and keep apart, and then can reduce the quantity of isolation structure, reduce battery management system's manufacturing cost.

Drawings

Fig. 1 is a schematic structural diagram of a battery management system according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a battery management system according to an embodiment of the present invention;

fig. 3 is a schematic diagram of the assembly of the battery management system and the power battery according to the embodiment of the invention.

Detailed Description

In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments. In the following description, specific details such as specific configurations and components are provided only to help the full understanding of the embodiments of the present invention. Thus, it will be apparent to those skilled in the art that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the invention. In addition, descriptions of well-known functions and constructions are omitted for clarity and conciseness.

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one.

As shown in fig. 1, a battery management system provided in an embodiment of the present invention is applied to a vehicle, where the vehicle includes a power battery and a storage battery, and the battery management system includes:

the sensor assembly 100 is used for acquiring sensing data of the power battery;

a first controller 200, the first controller 200 being electrically connected to the sensor assembly 100;

an isolation component 300;

the low voltage assembly 400 comprises a power module 410, a communication module 420 and a battery control unit 430, wherein the power module 410 and the communication module 420 are connected to the first controller 200 through the isolation assembly 300, the battery control unit 430 is electrically connected with the communication module 420, and the storage battery is used for supplying power to the power module 410.

The power battery described above may be regarded as a high-voltage battery in the vehicle, and the storage battery may be regarded as a low-voltage battery in the vehicle, in contrast. The sensor assembly 100 is mainly used for collecting sensing data of the power battery, such as voltage, current, etc., and since the sensor assembly 100 and the power battery have a relatively direct connection relationship, the sensor assembly 100 is generally divided into high-voltage portions.

The first Controller 200 may be a type of Controller, such as a Micro Controller Unit (MCU), a Central Processing Unit (CPU), or a single chip microcomputer, and is not limited herein. The first controller 200 is electrically connected to the sensor assembly 100 and is configured to acquire sensing data collected by the sensor assembly 100.

The power module 410 is connected to a battery, and the power module 410 may be considered as a module for converting a battery input voltage into an operating voltage of other circuits. The communication module 420 and the Battery Control Unit (BCU) 430 are generally powered by the power module 410, and the Battery is generally a low-voltage Battery, so that the power module 410, the communication module 420 and the BCU are considered to be part of the low-voltage assembly 400.

The isolation component 300 is used to isolate the high voltage part from the low voltage component 400, and it is easy to understand that the isolation component 300 may be a structure similar to an optical coupler, a transformer, etc. and can isolate the high voltage from the low voltage. In this embodiment, the power module 410 and the communication module 420 are isolated from the high voltage part by the isolation component 300, and the BCU is directly connected to the communication module 420, so that it is not necessary to separately isolate the BCU; compared with the prior art, the BCU and the sensor assembly 100 are respectively provided with the isolation structure, so that the isolation quantity can be saved, and the isolation cost can be reduced.

As shown in fig. 3, in an example, the power Battery includes a plurality of Battery units, each Battery Unit is connected to a Battery Management Unit (BMU), and each BMU may correspond to a Slave Controller (Slave Controller); and a plurality of BMUs corresponding to a plurality of battery cells may be connected to the BCU and the communication module 420.

The battery management system provided by the embodiment of the invention comprises a sensor assembly 100, a first controller 200, an isolation assembly 300 and a low-voltage assembly 400; the low voltage assembly 400 includes a power module 410, a communication module 420, and a battery control unit 430; the first controller 200 is electrically connected to the sensor assembly 100, the power module 410 and the communication module 420 are connected to the first controller 200 through the isolation assembly 300, and the battery control unit 430 is connected to the communication module 420. In this embodiment, the power module 410 and the communication module 420 are isolated from the high voltage part by the isolation component 300, and the BCU is directly connected to the communication module 420, so that isolation does not need to be performed at the BCU, and the number of isolation structures can be reduced, thereby reducing the manufacturing cost of the battery management system. Meanwhile, as the BCU is generally connected with more electronic elements, isolation is not needed at the BCU, the reliability of the BCU is improved, and the difficulty in setting the isolation assembly 300 can be effectively reduced.

Optionally, the sensor assembly 100 includes a first current sensor 110 and a second current sensor 120, and the first current sensor 110 and the second current sensor 120 are connected to a bus of the power battery.

The first current sensor 110 and the second current sensor 120 are used for collecting current data on a bus of the power battery, and the first current sensor and the second current sensor may be the same type of current sensor or different types of sensors.

In a preferred embodiment, the first current sensor 110 and the second current sensor 120 are different types of current sensors, for example, the first current sensor 110 is a shunt current sensor, and the second current sensor 120 is a hall current sensor.

In connection with fig. 2, a shunt type current sensor is generally made according to the principle that a direct current generates a voltage across a resistor when passing through the resistor, which may correspond to the resistor R1 shown in the figure; a hall current sensor is a sensor that measures current using the hall effect.

The embodiment collects current by adopting the shunt type current sensor and the Hall current sensor, can mutually check current data, and can effectively improve the reliability and safety of current data collection. The combination of the Level D and the ASIL-D is beneficial to meeting the requirement of the Level D (namely ASIL-D) in the Automobile Safety Integrity Level (ASIL).

In one example, the first current sensor 110 and the second current sensor 120 are disposed on a negative bus of the power cell.

Optionally, the isolation assembly 300 includes a power isolation circuit 310 and a digital isolation circuit 320, the power module 410 is connected to the first controller 200 through the power isolation circuit 310, and the communication module 420 is connected to the first controller 200 through the digital isolation circuit 320.

Referring to fig. 2, taking the first controller 200 as an MCU as an example, the power module 410 may be connected to the MCU through a power isolation circuit 310, such as a transformer, and the communication module 420 may be connected to the MCU through a digital isolation circuit 320, such as an optocoupler.

By connecting the power module 410 and the communication module 420 to the first controller 200 through the corresponding isolation circuits, respectively, the reliability and safety of the entire BMS can be effectively improved.

In one example, the communication module 420 includes a CAN transceiver.

Optionally, the sensor assembly 100 comprises a voltage acquisition module 130, and voltage sampling points of the voltage acquisition module 130 are located at least one of the following positions:

the power battery is used for being connected to a first positive bus of the quick charging structure;

the power battery is used for being connected to a second positive bus of the vehicle-mounted charger;

the power battery is used for being connected to a third positive bus of the second controller;

and the negative bus of the power battery.

Referring to fig. 2, the voltage sampling point on the first positive bus may correspond to a V5 position in the graph, the voltage sampling point on the second positive bus may correspond to a V4 position in the graph, the voltage sampling point on the third positive bus may correspond to V1, V2 and V3 positions in the graph, and the voltage sampling point on the negative bus corresponds to a V6 position in the graph.

In this embodiment, through setting up voltage acquisition module 130, can effectively gather the voltage on power battery's the bus, help in time discovering the voltage on the bus unusual, guarantee power battery's security.

Optionally, the third positive bus comprises a first bus-section, a second bus-section and a third bus-section;

a first end of the first bus-section is connected to the positive pole of a power cell, a second end of the first bus-section is connected to a first end of the second bus-section through a first resistor, a second end of the second bus-section is connected to a first end of the third bus-section through a fuse, and a second end of the third bus-section is connected to the second controller;

a voltage sampling point on the third positive bus is located on at least one of the first, second and third bus-sections.

Also in connection with fig. 2, the voltage sampling point on the first bus-section may correspond to the V1 position in the graph, the voltage sampling point on the second bus-section may correspond to the V2 position in the graph, and the voltage sampling point on the third bus-section may correspond to the V3 position in the graph.

By providing a voltage sampling point on at least one of the first, second and third bus-sections above, the operating condition of the corresponding electronic components, such as the illustrated first resistor R2 and/or fuse FU, can be monitored, improving the overall safety of the BMS.

In one example, the fast charge structure is connected between "fast charge +" and "fast charge-" in the figure; an On Board Charger (OBC) is connected between the OBC + and the OBC-; the second controller can be an MCU and is connected between the MCU + and the MCU-; the second controller may refer to a controller of at least one structure (corresponding to a resistor R3 in the drawing) in the vehicle, such as an oil pump, an alternating current-alternating current (DC-DC) conversion circuit, an air conditioner compressor, and a vehicle heater (PTC); the first resistor R2 may be a pre-charge resistor.

Optionally, the sensor assembly 100 further includes a relay adhesion detection module 140, an input end of the relay adhesion detection module 140 is connected to the voltage acquisition module 130, and an output end of the relay adhesion detection module 140 is connected to the first controller 200.

It is easily understood that the relay adhesion detection module 140 may detect the adhesion condition of the relay in the BMS, and the specific implementation process of the detection of the adhesion condition may be implemented based on the detection of the voltage at various places of the BMS. Therefore, in this embodiment, the input end of the relay adhesion detection module 140 is connected to the voltage acquisition module 130 to obtain voltage data and further determine the adhesion condition of the relay, so as to eliminate the adhesion fault.

Optionally, the sensor assembly 100 further comprises an insulation detection module 150, and the insulation detection module 150 is electrically connected to the first controller 200.

In this embodiment, the insulation detection module 150 may be a module that detects at least one of a total positive insulation resistance and a total negative insulation resistance of the power battery, and is helpful for timely finding an insulation potential safety hazard.

Optionally, an embodiment of the present invention further provides a vehicle, including a power battery 510, a storage battery 520, and the above battery management system;

as shown in fig. 2, the sensor assembly 100 included in the battery management system is connected to the power battery 510, and the power module 410 in the low-voltage assembly 400 included in the battery management system is connected to the storage battery 520.

The vehicle provided in this embodiment is a vehicle including the battery management system in the above embodiment, and therefore, each specific implementation of the battery management system in the above embodiment can be applied to the vehicle in this embodiment, and the same technical effect can be obtained, and details are not described here.

The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.