Battery management system and vehicle

Abstract

The embodiment of the present invention provides a battery management system and a vehicle, the battery management system is applied to a vehicle, the vehicle includes a power battery and a storage battery, the battery management system includes: a sensor component, the sensor component is used to collect sensor data of the power battery; a first controller, the first controller is electrically connected to the sensor component; an isolation component; a low-voltage component, the low-voltage component includes a power module, a communication module and a battery control unit, the power module and the communication module are both connected to the first controller through the isolation component, the battery control unit is electrically connected to the communication module, and the storage battery is used to supply power to the power module. The embodiment of the present invention can reduce the number of isolation structures and reduce the manufacturing cost of the battery management system.

Description

Technical Field

[0001] The present invention relates to the technical field of battery management, and in particular to a battery management system and a vehicle. Background Art

[0002] As we all know, the Battery Management System (BMS) is a system for monitoring and controlling batteries in products such as electric vehicles. BMS includes a high-voltage area and a low-voltage area. The high-voltage area usually corresponds to components used to detect battery operating current, voltage, etc., while the low-voltage area usually corresponds to components used for regulation, control, communication, etc.

[0003] Normally, an isolation structure needs to be set between the high-voltage area and the low-voltage area to ensure the overall safety of the BMS; however, in the prior art, the components in the BMS are usually spatially associated and arranged according to the functions to be implemented, resulting in more overlaps between the high-voltage area and the low-voltage area, which in turn results in a large number of isolation structures and a high manufacturing cost of the BMS. Summary of the invention

[0004] Embodiments of the present invention provide a battery management system and a vehicle to solve the problem that the number of isolation structures in the existing BMS is large and the manufacturing cost of the BMS is high.

[0005] In order to solve the above-mentioned technical problems, the present invention is achieved as follows:

[0006] In a first aspect, an embodiment of the present invention provides a battery management system, which is applied to a vehicle, wherein the vehicle includes a power battery and a storage battery, and the battery management system includes:

[0007] A sensor component, the sensor component is used to collect sensor data of the power battery;

[0008] a first controller, the first controller being electrically connected to the sensor assembly;

[0009] Isolate components;

[0010] A low-voltage component, which includes a power module, a communication module and a battery control unit. The power module and the communication module are both connected to the first controller through the isolation component. The battery control unit is electrically connected to the communication module, and the battery is used to supply power to the power module.

[0011] In a second aspect, an embodiment of the present invention further provides a vehicle, including a power battery, a storage battery and the above-mentioned battery management system;

[0012] The sensor component included in the battery management system is connected to the power battery, and the power module in the low-voltage component included in the battery management system is connected to the storage battery.

[0013] The battery management system provided by the embodiment of the present invention includes a sensor component, a first controller, an isolation component and a low-voltage component; wherein the low-voltage component includes a power module, a communication module and a battery control unit; the first controller is electrically connected to the sensor component, the power module and the communication module are connected to the first controller through the isolation component, and the battery control unit is connected to the communication module. In this embodiment, the power module and the communication module are isolated from the high-voltage part through the isolation component, and the battery control unit is directly connected to the communication module, so there is no need to isolate the battery control unit separately, thereby reducing the number of isolation structures and reducing the manufacturing cost of the battery management system. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A schematic diagram of the structure of a battery management system provided by an embodiment of the present invention;

[0015] Figure 2 Another structural schematic diagram of a battery management system provided by an embodiment of the present invention;

[0016] Figure 3 It is a schematic diagram of the assembly of a battery management system and a power battery in an embodiment of the present invention. DETAILED DESCRIPTION

[0017] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will be described in detail in conjunction with the accompanying drawings and specific embodiments. In the following description, specific details such as specific configurations and components are provided only to help fully understand the embodiments of the present invention. Therefore, it should be clear to those skilled in the art that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present invention. In addition, for clarity and brevity, the description of known functions and structures is omitted.

[0018] Unless otherwise defined, the technical or scientific terms used in the present invention shall have the common meanings understood by persons with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, the words "one" or "an" and similar words do not indicate a quantity limitation, but indicate the existence of at least one.

[0019] like Figure 1 As shown, the battery management system provided by the embodiment of the present invention is applied to a vehicle, wherein the vehicle includes a power battery and a storage battery, and the battery management system includes:

[0020] A sensor assembly 100, wherein the sensor assembly 100 is used to collect sensor data of the power battery;

[0021] A first controller 200, wherein the first controller 200 is electrically connected to the sensor assembly 100;

[0022] Isolation assembly 300;

[0023] A low-voltage component 400 includes a power module 410, a communication module 420 and a battery control unit 430. The power module 410 and the communication module 420 are both connected to the first controller 200 through the isolation component 300. The battery control unit 430 is electrically connected to the communication module 420. The battery is used to supply power to the power module 410.

[0024] The power battery can be considered as a high-voltage battery in the vehicle, and the storage battery can be considered as a low-voltage battery in the vehicle. The sensor assembly 100 is mainly used to collect sensor data of the power battery, such as voltage, current, etc. Since the sensor assembly 100 is directly connected to the power battery, the sensor assembly 100 is usually divided into a high-voltage part.

[0025] The first controller 200 may be a controller such as a microcontroller (MCU), a central processing unit (CPU) or a single chip microcomputer, which is not specifically limited here. The first controller 200 is electrically connected to the sensor assembly 100 and can be used to obtain the sensor data collected by the sensor assembly 100.

[0026] The power module 410 is connected to the battery, and the power module 410 can be considered as a module for converting the battery input voltage into the working voltage of other circuits. The communication module 420 and the battery control unit (BCU) 430 are usually powered by the power module 410, and the battery is usually a low-voltage battery. Therefore, the power module 410, the communication module 420 and the BCU can be considered as components of the low-voltage component 400.

[0027] The isolation component 300 is used to isolate the above-mentioned high-voltage part from the low-voltage component 400. It is easy to understand that the isolation component 300 can be a structure similar to an optical coupler, a transformer, etc., which can achieve high-voltage and low-voltage isolation. In this embodiment, the power module 410 and the communication module 420 are isolated from the high-voltage part through the isolation component 300, and the BCU is directly connected to the communication module 420, and there is no need to isolate it separately at the BCU; compared with the prior art, in which the BCU and the sensor component 100 are isolated separately, this embodiment can save the number of isolations and reduce the isolation cost.

[0028] like Figure 3 As shown, in one example, the power battery includes a plurality of battery cells, each battery cell is respectively connected to a battery management unit (BMU), and each BMU can correspond to a slave controller (Slave Controller); and the plurality of BMUs corresponding to the plurality of battery cells can be connected to the BCU and the communication module 420.

[0029] The battery management system provided by the embodiment of the present invention includes a sensor component 100, a first controller 200, an isolation component 300 and a low-voltage component 400; wherein the low-voltage component 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 component 100, the power module 410 and the communication module 420 are connected to the first controller 200 through the isolation component 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 through the isolation component 300, and the BCU is directly connected to the communication module 420, and there is no need to isolate it separately at the BCU, thereby reducing the number of isolation structures and reducing the manufacturing cost of the battery management system. At the same time, since the BCU usually needs to connect more electronic components, there is no need to isolate it at the BCU, which increases the reliability of the BCU and effectively reduces the difficulty of setting the above-mentioned isolation component 300.

[0030] 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 bar of the power battery.

[0031] The first current sensor 110 and the second current sensor 120 are used to collect current data on the busbar of the power battery. The two can be current sensors of the same type or sensors of different types. The reliability of current data collection can be improved through redundant arrangement in quantity.

[0032] In a preferred embodiment, the first current sensor 110 and the second current sensor 120 are current sensors of different types. For example, the first current sensor 110 is a shunt current sensor, and the second current sensor 120 is a Hall current sensor.

[0033] Combination Figure 2 The shunt current sensor is usually made based on the principle that a voltage is generated across a resistor when a DC current passes through the resistor. The resistor may correspond to the resistor R1 shown in the figure. The Hall current sensor is a sensor that uses the Hall effect to measure current.

[0034] This embodiment uses a shunt current sensor and a Hall current sensor to collect current, and can verify the current data with each other, which can effectively improve the reliability and safety of current data collection. Combined with practical applications, it helps to meet the requirements of level D (i.e., ASIL-D) in the Automotive Safety Integration Level (ASIL).

[0035] In one example, the first current sensor 110 and the second current sensor 120 are disposed on the negative busbar of the power battery.

[0036] Optionally, the isolation component 300 includes a power isolation circuit 310 and a digital isolation circuit 320 , the power module 410 is connected to the first controller 200 via the power isolation circuit 310 , and the communication module 420 is connected to the first controller 200 via the digital isolation circuit 320 .

[0037] refer to Figure 2 Taking the first controller 200 as an MCU as an example, the power module 410 can be connected to the MCU through a power isolation circuit 310 such as a transformer, and the communication module 420 can be connected to the MCU through a digital isolation circuit 320 such as an optical coupler.

[0038] By connecting the power module 410 and the communication module 420 respectively through the corresponding isolation circuits and the first controller 200, the reliability and safety of the entire BMS can be effectively improved.

[0039] In one example, the communication module 420 includes a CAN transceiver.

[0040] Optionally, the sensor assembly 100 includes a voltage acquisition module 130, and a voltage sampling point of the voltage acquisition module 130 is located at at least one of the following positions:

[0041] On a first positive busbar of the power battery used for connecting to the fast charging structure;

[0042] A second positive busbar of the power battery for connecting to an on-board charger;

[0043] A third positive busbar of the power battery used for connecting to the second controller;

[0044] On the negative busbar of the power battery.

[0045] See also Figure 2 , the voltage sampling point on the first positive bus can correspond to the V5 position in the figure, the voltage sampling point on the second positive bus can correspond to the V4 position in the figure, the voltage sampling point on the third positive bus can correspond to the V1, V2 and V3 positions in the figure, and the voltage sampling point on the negative bus corresponds to the V6 position in the figure.

[0046] In this embodiment, by providing the voltage collection module 130 , the voltage on the busbar of the power battery can be effectively collected, which helps to timely discover the voltage abnormality on the busbar and ensure the safety of the power battery.

[0047] Optionally, the third positive busbar includes a first busbar segment, a second busbar segment and a third busbar segment;

[0048] The first end of the first bus segment is connected to the positive electrode of the power battery, the second end of the first bus segment is connected to the first end of the second bus segment through a first resistor, the second end of the second bus segment is connected to the first end of the third bus segment through a fuse, and the second end of the third bus segment is connected to the second controller;

[0049] The voltage sampling point on the third positive bus is located on at least one bus segment among the first bus segment, the second bus segment and the third bus segment.

[0050] Also combined Figure 2 , the voltage sampling point on the first bus section may correspond to the position V1 in the figure, the voltage sampling point on the second bus section may correspond to the position V2 in the figure, and the voltage sampling point on the third bus section may correspond to the position V3 in the figure.

[0051] By setting a voltage sampling point on at least one of the first bus segment, the second bus segment and the third bus segment, the working status of the corresponding electronic components, such as the first resistor R2 and / or the fuse FU shown in the figure, can be monitored to improve the overall safety of the BMS.

[0052] In one example, the fast charging structure is connected between "Fast Charge +" and "Fast Charge -" in the figure; the on-board charger (OnBoard Charger, OBC) is connected between "OBC +" and "OBC -" in the figure; the second controller can be an MCU, connected between "MCU +" and "MCU -" in the figure; the second controller can refer to a controller of at least one structure in the vehicle such as an oil pump, an AC-AC (DC-DC) conversion circuit, an air-conditioning compressor, and a car heater (Positive Temperature Coefficient, PTC) (corresponding to the resistor R3 in the figure); the first resistor R2 can be a pre-charging resistor.

[0053] 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 .

[0054] It is easy to understand that the relay adhesion detection module 140 can detect the adhesion of the relay in the BMS, and the specific implementation process of the adhesion detection can be implemented based on the detection of the voltage at various locations 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 of the relay to eliminate adhesion faults.

[0055] Optionally, the sensor assembly 100 further includes an insulation detection module 150 , and the insulation detection module 150 is electrically connected to the first controller 200 .

[0056] In this embodiment, the insulation detection module 150 may refer to a module for detecting at least one of the total positive insulation resistance and the total negative insulation resistance of the power battery, which helps to timely discover insulation safety hazards.

[0057] Optionally, an embodiment of the present invention further provides a vehicle, comprising a power battery 510, a storage battery 520 and the above-mentioned battery management system;

[0058] like Figure 2 As shown, the sensor component 100 included in the battery management system is connected to the power battery 510 , and the power module 410 in the low-voltage component 400 included in the battery management system is connected to the storage battery 520 .

[0059] The vehicle provided in this embodiment is a vehicle that includes the battery management system in the above embodiments. Therefore, each specific implementation method of the battery management system in the above embodiments can be applied to the vehicle in this embodiment and can achieve the same technical effect, which will not be repeated here.

[0060] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A battery management system, applied to a vehicle, wherein the vehicle comprises a power battery and a storage battery, characterized in that: The battery management system comprises: A sensor assembly (100), the sensor assembly (100) being used to collect sensor data of the power battery, the sensor assembly (100) comprising a voltage collection module (130), the voltage sampling point of the voltage collection module (130) being located at at least one of the following positions: On a first positive busbar of the power battery used for connecting to the fast charging structure; A second positive busbar of the power battery for connecting to an on-board charger; A third positive busbar of the power battery used for connecting to the second controller; On the negative busbar of the power battery; A first controller (200), the first controller (200) being electrically connected to the sensor assembly (100); An isolation assembly (300); A low-voltage component (400), the low-voltage component (400) comprising a power module (410), a communication module (420) and a battery control unit (430), the power module (410) and the communication module (420) are both connected to the first controller (200) via the isolation component (300), the battery control unit (430) is electrically connected to the communication module (420), the storage battery is used to supply power to the power module (410), Wherein, the third positive busbar includes a first busbar segment, a second busbar segment and a third busbar segment; The first end of the first bus segment is connected to the positive electrode of the power battery, the second end of the first bus segment is connected to the first end of the second bus segment through a first resistor, the second end of the second bus segment is connected to the first end of the third bus segment through a fuse, and the second end of the third bus segment is connected to the second controller; The voltage sampling point on the third positive bus is located on at least one bus segment among the first bus segment, the second bus segment and the third bus segment; The sensor assembly (100) comprises a first current sensor (110) and a second current sensor (120), wherein the first current sensor (110) and the second current sensor (120) are connected to a bus bar of the power battery.

2. The battery management system according to claim 1, characterized in that: The first current sensor (110) is a shunt current sensor, and the second current sensor (120) is a Hall current sensor.

3. The battery management system according to claim 1, characterized in that: The isolation component (300) includes a power isolation circuit (310) and a digital isolation circuit (320); the power module (410) is connected to the first controller (200) via the power isolation circuit (310); and the communication module (420) is connected to the first controller (200) via the digital isolation circuit (320).

4. The battery management system according to claim 1, characterized in that: The communication module (420) comprises a CAN transceiver.

5. The battery management system according to claim 1, characterized in that: The sensor assembly (100) further comprises a relay adhesion detection module (140), wherein 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).

6. The battery management system according to claim 1, characterized in that: 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).

7. A vehicle, characterized in that: Comprising a power battery (510), a storage battery (520) and a battery management system as claimed in any one of claims 1 to 6; The sensor component (100) included in the battery management system is connected to the power battery (510), and the power module (410) in the low-voltage component (400) included in the battery management system is connected to the storage battery (520).

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