BMS system and current sensor box used for same

Abstract

The utility model discloses a BMS (Battery Management System) and a current sensor box used for the same. The current sensor box comprises a PCB (Printed Circuit Board), and a group of communication lines, a first group of power supply lines, a second group of power supply lines and a terminal resistor which are positioned on the PCB, the group of communication lines are used for connecting an output communication port of the current sensor chip and a receiving communication port of the BMS system; the first group of power supply lines are used for connecting a power supply input port of the current sensor chip and a power supply output port of the 12V power supply; the second group of power supply lines is used for connecting the power supply input port of the current sensor chip and the low-voltage side of the DC / DC transformer with the 24V / 48V transformed into 12V, and the high-voltage side of the DC / DC transformer is used for connecting the power supply output port of the 24V / 48V power supply; the terminal resistor is used for being connected with a group of communication lines in parallel, and the terminal resistor is integrated in the current sensor chip or welded on the PCB, so that the BMS system equipped with the current sensor chip can adapt to different power supply platforms.

Description

Technical Field

[0001] The utility model relates to the technical field of battery management systems, in particular to a BMS system and a current sensor box used therefor. Background Art

[0002] With the current hot electric market, more and more commercial vehicles are starting to use pure electric or hybrid power for driving. As an important sensing element for monitoring current changes in the battery system, the accuracy of the current sensor will directly affect the battery system's assessment of SOC and have an important impact on the charging and discharging performance.

[0003] The common high-precision current sensors on the market are basically developed for passenger car platforms. Compared with the overall market volume of commercial vehicles, the passenger car market has a large base, and the power supply platform is basically 12V, but the more common low-voltage power supply in the commercial vehicle industry is 24V. If there is no 24V to 12V circuit design on the battery management system (BMS), products that have been widely used in passenger cars cannot be used, and the performance of the battery system will also be affected by the performance of the current sensor. Utility Model Content

[0004] The utility model provides a BMS system and a current sensor box used therefor, so as to solve the problem in the related art that the BMS cannot be adapted to the power supplies of commercial vehicles and passenger vehicles at the same time.

[0005] In one aspect of the present invention, a current sensor box for a BMS system is provided, comprising:

[0006] A PCB board, and a group of communication lines, a first group of power supply lines, a second group of power supply lines and a terminal resistor located on the PCB board;

[0007] One end of the group of communication lines is used to connect to the output communication port of the current sensor chip, and the other end is used to connect to the receiving communication port of the BMS system;

[0008] One end of the first group of power supply lines is used to connect to the power supply input port of the current sensor chip, and the other end is used to connect to the power supply output port of the 12V power supply;

[0009] One end of the second group of power supply lines is used to connect to the power supply input port of the current sensor chip, and the other end is used to connect to the low voltage side of a DC / DC transformer capable of transforming 24V / 48V to 12V, and the high voltage side of the DC / DC transformer is used to connect to the power supply output port of a 24V / 48V power supply;

[0010] The terminal resistor is used to be connected in parallel with the group of communication lines, and the terminal resistor is integrated in the current sensor chip or soldered on the PCB board.

[0011] Optionally, the group of communication lines includes a first communication line and a second communication line, one end of the first communication line is used to connect to the CAN_L pin of the current sensor chip, and the other end is used to form a pin3 pin for connecting to a first receiving communication port of the BMS system; one end of the second communication line is used to connect to the CAN_H pin of the current sensor chip, and the other end is used to form a pin4 pin for connecting to a second receiving communication port of the BMS system.

[0012] Optionally, the first group of power supply lines includes a first positive line and a first negative line, one end of the first positive line is used to connect to the Uc pin of the current sensor chip, and the other end is used to form a pin7 pin for connecting to the positive pole of the 12V power supply; one end of the first negative line is used to connect to the GND pin of the current sensor chip, and the other end is used to form a pin8 pin for connecting to the negative pole of the 12V power supply.

[0013] Optionally, the second group of power supply lines includes a second positive line and a second negative line, one end of the second positive line is used to connect to the Uc pin of the current sensor chip, and the other end is used to connect to the low-voltage positive pole of a DC / DC transformer capable of transforming 24V / 48V into 12V, the high-voltage positive pole of the DC / DC transformer is used to form a pin5 pin, which is used to connect to the positive pole of the 24V / 48V power supply, one end of the second negative line is used to connect to the GND pin of the current sensor chip, and the other end is used to connect to the low-voltage negative pole of the DC / DC transformer capable of transforming 24V / 48V into 12V, the high-voltage negative pole of the DC / DC transformer is used to form a pin6 pin, which is used to connect to the negative pole of the 24V / 48V power supply.

[0014] Optionally, a filtering structure is also included, which is located on the second group of power supply lines, one end of the filtering structure is connected to the current sensor chip, and the other end is connected to the low-voltage side of the DC / DC transformer capable of transforming 24V / 48V to 12V.

[0015] Optionally, the filtering structure includes a first filter and a second filter, one end of the first filter is used to connect to the Uc pin of the current sensor chip, and the other end is used to connect to the low-voltage positive pole of a DC / DC transformer capable of transforming 24V / 48V into 12V, and the high-voltage positive pole of the DC / DC transformer is used to form a pin5 pin for connecting to the positive pole of a 24V / 48V power supply; one end of the second filter is used to connect to the GND pin of the current sensor chip, and the other end is used to connect to the low-voltage negative pole of a DC / DC transformer capable of transforming 24V / 48V into 12V, and the high-voltage negative pole of the DC / DC transformer is used to form a pin6 pin for connecting to the negative pole of a 24V / 48V power supply.

[0016] Optionally, when the terminal resistor is soldered on the PCB board, one end of the terminal resistor leads to the pin1 pin, and the other end of the terminal resistor leads to the pin2 pin.

[0017] Optionally, the resistance of the terminal resistor is 120Ω.

[0018] Optionally, the current sensor chip is a 12V Hall current sensor.

[0019] Another aspect of the present invention provides a BMS system, comprising the current sensor box for the BMS system described in any one of the present inventions.

[0020] The utility model embodiment proposes a BMS system and a current sensor box for the same, the current sensor box comprising: a PCB board, and a group of communication lines, a first group of power lines, a second group of power lines and a terminal resistor located on the PCB board; wherein one end of a group of communication lines is used to connect the output communication port of the current sensor chip, and the other end is used to connect the receiving communication port of the BMS system; one end of the first group of power lines is used to connect the power input port of the current sensor chip, and the other end is used to connect the power output port of the 12V power supply; one end of the second group of power lines is used to connect the power input port of the current sensor chip, and the other end is used to connect the low voltage side of the DC / DC transformer that can transform 24V / 48V into 12V, and the high voltage side of the DC / DC transformer is used to connect the power output port of the 24V / 48V power supply; the terminal resistor is used to be connected in parallel with a group of communication lines, and the terminal resistor is integrated in the current sensor chip, or welded on the PCB board. Thus, by setting two groups of power lines, when connecting the current sensor chip to the power supply platform, the first group of power lines or the second group of power lines can be selected according to whether it is a power supply platform for a passenger car or a power supply platform for a commercial vehicle. In addition, a port is reserved on the current sensor box in advance, which not only avoids the update and iteration of the main body of the BMS system, but also enables the BMS system equipped with the current sensor chip to adapt to different power supply platforms.

[0021] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present utility model, nor are they intended to limit the scope of the present utility model. Other features of the present utility model will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 This is a circuit schematic diagram of a current sensor box for a BMS system proposed in an embodiment of the utility model;

[0024] Figure 2 The utility model is a circuit diagram of a current sensor box for a BMS system according to an embodiment of the utility model. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0026] It should be noted that the terms "first", "second", etc. in the specification and claims of the present utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the utility model described herein can be implemented in an order other than those illustrated or described herein.

[0027] Figure 1 The circuit diagram of the current sensor box for the BMS system proposed in the embodiment of the utility model is shown in FIG. The current sensor box for the BMS system includes:

[0028] A PCB board 100, and a group of communication lines 200, a first group of power supply lines 300, a second group of power supply lines 400 and a terminal resistor R1 located on the PCB board 100;

[0029] One end of a set of communication lines 200 is used to connect to the output communication port of the current sensor chip 500, and the other end is used to connect to the receiving communication port of the BMS system 600;

[0030] One end of the first group of power supply lines 300 is used to connect to the power supply input port of the current sensor chip 500, and the other end is used to connect to the power supply output port of the 12V power supply;

[0031] One end of the second group of power supply lines 400 is used to connect to the power supply input port of the current sensor chip 500, and the other end is used to connect to the low voltage side of the DC / DC transformer 700 that can transform 24V / 48V into 12V, and the high voltage side of the DC / DC transformer 700 is used to connect to the power supply output port of the 24V / 48V power supply;

[0032] The terminal resistor R1 is used to be connected in parallel with a group of communication lines 200 . The terminal resistor R1 is integrated in the current sensor chip 500 or soldered on the PCB board 100 .

[0033] It is understandable that, since the voltage output by the power supply platform of the passenger car platform and the commercial vehicle platform is different, the power supply of the passenger car platform is basically 12V, and the power supply of the commercial vehicle is basically 24V. If the BMS system provided to the passenger car platform is used for the commercial vehicle platform, or the BMS system provided to the commercial vehicle platform is used for the passenger car platform, it is necessary to redevelop and design the main structure of the BMS system, which is not only long in cycle but also high in cost. The BMS systems between different models cannot be universal. Furthermore, the utility model integrates two sets of power supply lines in the current sensor box without changing the main hardware circuit of the BMS system. The first set of power supply lines 300 can be connected to the power supply of the passenger car platform, and the second set of power supply lines 400 can be connected to the power supply of the commercial vehicle platform. Thus, two sets of power supply lines are reserved in advance so that the same BMS main hardware circuit can adapt to different models, be compatible with multiple models, and improve the adaptability of the BMS system. Avoid different BMS systems in different models, resulting in the need for the maintenance of the BMS system at the back end to be specifically connected according to different models, increasing labor costs.

[0034] It should be noted that, continue to refer to Figure 1, the current sensor chip 500 includes four pins, CAN-H, CAN-L, Uc and GND, of which CAN-H and CAN-L are used for communication between the current sensor chip 500 and the BMS system 600, and the collected current information is sent out through CAN communication. Uc and GND are power supply circuits, mainly external power supply circuits for the current sensor chip 500. When the BMS system is installed on a passenger car platform, it can be connected to the 12V power supply of the passenger car platform through the first group of power supply lines 300. When the BMS system is installed on a commercial vehicle platform, it can be connected to the 24V power supply of the commercial vehicle platform through the second group of power supply lines 400. At this time, the DC / DC transformer 700 located on the second group of power supply lines 400 is a 24V to 12V DC / DC transformer. In other embodiments, if the vehicle platform provides a 48V power supply, the DC / DC transformer 700 located on the second group of power supply lines 400 is a 48V to 12V DC / DC transformer.

[0035] The terminal resistor R1 may be connected in parallel to a group of communication lines 200 to improve the stability of communication signal transmission.

[0036] Optionally, continue to refer to Figure 1 A set of communication lines 200 includes a first communication line 201 and a second communication line 202. One end of the first communication line 201 is used to connect to the CAN_L pin of the current sensor chip 500, and the other end is used to form a pin3 pin for connecting to the first receiving communication port of the BMS system 600; one end of the second communication line 202 is used to connect to the CAN_H pin of the current sensor chip 500, and the other end is used to form a pin4 pin for connecting to the second receiving communication port of the BMS system.

[0037] Among them, the pin3 pin can be connected to the first receiving communication port of the BMS system 600, and the pin4 pin can be connected to the second receiving communication port of the BMS system 600. If the terminal resistor R1 is not integrated in the current sensor chip 500, that is, the terminal resistor R1 is soldered on the PCB board, then the terminal resistor R1 can be connected in parallel to a group of communication lines 200.

[0038] Optionally, continue to refer to Figure 1 The first group of power supply lines 300 includes a first positive line 301 and a first negative line 302. One end of the first positive line 301 is used to connect to the Uc pin of the current sensor chip 500, and the other end is used to form a pin7 pin for connecting to the positive pole of the 12V power supply. One end of the first negative line 302 is used to connect to the GND pin of the current sensor chip 500, and the other end is used to form a pin8 pin for connecting to the negative pole of the 12V power supply.

[0039] Among them, pin7 pin can be directly connected to the positive pole of the 12V power supply, and pin8 pin can be directly connected to the negative pole of the 12V power supply. If the BMS system 600 is used for a passenger car, pin7 pin and pin8 pin can be directly connected to the power supply of the passenger car.

[0040] Optionally, continue to refer to Figure 1 The second group of power supply lines 400 includes a second positive line 401 and a second negative line 402, one end of the second positive line 401 is used to connect to the Uc pin of the current sensor chip 500, and the other end is used to connect to the low-voltage positive pole of the DC / DC transformer 700 that can transform 24V / 48V into 12V, the high-voltage positive pole of the DC / DC transformer 700 is used to form the pin5 pin, which is used to connect to the positive pole of the 24V / 48V power supply, one end of the second negative line 402 is used to connect to the GND pin of the current sensor chip 500, and the other end is used to connect to the low-voltage negative pole of the DC / DC transformer 700 that can transform 24V / 48V into 12V, the high-voltage negative pole of the DC / DC transformer 700 is used to form the pin6 pin, which is used to connect to the negative pole of the 24V / 48V power supply.

[0041] Among them, pin5 can be directly connected to the positive pole of the 24V / 48V power supply, and pin6 can be directly connected to the negative pole of the 24V / 48V power supply. If BMS600 is used in commercial vehicles, pin5 and pin6 can be directly connected to the power supply of the commercial vehicle.

[0042] Optionally, refer to Figure 2 The current sensor box also includes a filter structure 800, which is located on the second group of power supply lines 400. One end of the filter structure 800 is connected to the current sensor chip 500, and the other end is connected to the low-voltage side of a DC / DC transformer 700 that can transform 24V / 48V into 12V.

[0043] The filter structure 800 is added to the output end of the DC / DC transformer 700 to ensure that the current output to the Hall sensor does not carry interference signals that affect the performance and function.

[0044] Optionally, continue to refer to Figure 2The filtering structure 800 includes a first filter 801 and a second filter 802. One end of the first filter 801 is used to connect to the Uc pin of the current sensor chip 500, and the other end is used to connect to the low-voltage positive pole of the DC / DC transformer 700 that can transform 24V / 48V into 12V. The high-voltage positive pole of the DC / DC transformer 700 is used to form the pin5 pin for connecting to the positive pole of the 24V / 48V power supply; one end of the second filter 802 is used to connect to the GND pin of the current sensor chip 500, and the other end is used to connect to the low-voltage negative pole of the DC / DC transformer 700 that can transform 24V / 48V into 12V. The high-voltage negative pole of the DC / DC transformer 700 is used to form the pin6 pin for connecting to the negative pole of the 24V / 48V power supply.

[0045] The first filter 801 and the second filter 802 may be active filters. In order to ensure that the stepped-down power supply has less interference on the current sensor, it is necessary to perform filtering before the current enters the current sensor, that is, use a filtering structure on the power supply line.

[0046] Optionally, when the terminal resistor R1 is soldered on the PCB board 100 , one end of the terminal resistor R1 leads to the pin1 pin, and the other end of the terminal resistor R1 leads to the pin2 pin.

[0047] Among them, considering that some current sensors do not have built-in 120Ω terminal resistors, in order to ensure the stability of transmission, a 120Ω terminal resistor is added inside the current sensor box for optional use. In order to ensure that it is also applicable in the adapted power supply scenario, a power supply is left directly out.

[0048] Optionally, the resistance of the terminal resistor R1 is 120Ω.

[0049] Optionally, the current sensor chip 500 is a 12V Hall current sensor.

[0050] It should be noted that when installing the BMS system, when the external power supply voltage is 24V and the BMS has no 12V power supply output, and the Hall current sensor does not have a terminal resistor, the power supply line needs to be connected to Pin5 / Pin6, the CAN communication line to Pin3 / Pin4, and Pin1 / Pin2 needs to be connected in parallel on the CAN line.

[0051] When the external power supply voltage is 24V, and the BMS has no 12V output power supply configuration, and the Hall sensor has a terminal resistor, you need to connect the power supply line to Pin5 / Pin6 and the CAN communication line to Pin3 / Pin4.

[0052] When the external power supply voltage is 12V and the Hall sensor does not have a terminal resistor, the power supply line needs to be connected to Pin7 / Pin8, the CAN communication line needs to be connected to Pin3 / Pin4, and Pin1 / Pin2 needs to be connected in parallel on the CAN line.

[0053] When the external power supply voltage is 12V and the Hall sensor has a terminal resistor, you need to connect the power supply line to Pin7 / Pin8 and the CAN communication line to Pin3 / Pin4.

[0054] When used in a battery with multiple branches, Hall sensors with different CAN-IDs need to be used in the current sensor box to facilitate the system to identify the current information of different branches.

[0055] When used in a 48V system, the DC / DC specifications need to be adjusted. That is, a 24V / 12V DC / DC current sensor box and a 48V / 12V DC / DC current sensor box can be set in advance, and the corresponding matching can be performed during actual use.

[0056] In another aspect of the present invention, a BMS system is provided, comprising a current sensor box for a BMS system according to any one of the present inventions. By integrating a step-down circuit in the current sensor box, a high-precision Hall current sensor is used in a commercial vehicle system, thereby making up for the lack of battery system capacity.

[0057] In summary, an embodiment of the utility model proposes a BMS system and a current sensor box used therefor, the current sensor box comprising: a PCB board, and a group of communication lines, a first group of power supply lines, a second group of power supply lines and a terminal resistor located on the PCB board; wherein, one end of a group of communication lines is used to connect to the output communication port of the current sensor chip, and the other end is used to connect to the receiving communication port of the BMS system; one end of the first group of power supply lines is used to connect to the power supply input port of the current sensor chip, and the other end is used to connect to the power supply output port of the 12V power supply; one end of the second group of power supply lines is used to connect to the power supply input port of the current sensor chip, and the other end is used to connect to the low-voltage side of a DC / DC transformer capable of transforming 24V / 48V into 12V, and the high-voltage side of the DC / DC transformer is used to connect to the power supply output port of the 24V / 48V power supply; the terminal resistor is used to be connected in parallel with a group of communication lines, and the terminal resistor is integrated in the current sensor chip or welded on the PCB board. Therefore, by setting two sets of power supply lines, when connecting the current sensor chip to the power supply platform, the first set of power supply lines or the second set of power supply lines can be selected according to whether it is a passenger car power supply platform or a commercial vehicle power supply platform. In addition, a port is reserved on the current sensor box in advance, which not only avoids the main body of the BMS system from being updated and iterated, but also enables the BMS system equipped with the current sensor chip to adapt to different power supply platforms.

[0058] The above specific implementations do not constitute a limitation on the protection scope of the present utility model. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A current sensor box for a BMS system, characterized in that: include: A PCB board, and a group of communication lines, a first group of power supply lines, a second group of power supply lines and a terminal resistor located on the PCB board; One end of the group of communication lines is used to connect to the output communication port of the current sensor chip, and the other end is used to connect to the receiving communication port of the BMS system; One end of the first group of power supply lines is used to connect to the power supply input port of the current sensor chip, and the other end is used to connect to the power supply output port of the 12V power supply; One end of the second group of power supply lines is used to connect to the power supply input port of the current sensor chip, and the other end is used to connect to the low voltage side of a DC / DC transformer capable of transforming 24V / 48V to 12V, and the high voltage side of the DC / DC transformer is used to connect to the power supply output port of a 24V / 48V power supply; The terminal resistor is used to be connected in parallel with the group of communication lines, and the terminal resistor is integrated in the current sensor chip or soldered on the PCB board.

2. The current sensor box for the BMS system according to claim 1, characterized in that: The group of communication lines includes a first communication line and a second communication line, one end of the first communication line is used to connect to the CAN_L pin of the current sensor chip, and the other end is used to form a pin3 pin for connecting to the first receiving communication port of the BMS system; one end of the second communication line is used to connect to the CAN_H pin of the current sensor chip, and the other end is used to form a pin4 pin for connecting to the second receiving communication port of the BMS system.

3. The current sensor box for the BMS system according to claim 1, characterized in that: The first group of power supply lines includes a first positive line and a first negative line, one end of the first positive line is used to connect to the Uc pin of the current sensor chip, and the other end is used to form a pin7 pin for connecting to the positive pole of the 12V power supply, one end of the first negative line is used to connect to the GND pin of the current sensor chip, and the other end is used to form a pin8 pin for connecting to the negative pole of the 12V power supply.

4. The current sensor box for a BMS system according to claim 1, characterized in that: The second group of power supply lines includes a second positive line and a second negative line, one end of the second positive line is used to connect to the Uc pin of the current sensor chip, and the other end is used to connect to the low-voltage positive pole of a DC / DC transformer capable of transforming 24V / 48V into 12V, the high-voltage positive pole of the DC / DC transformer is used to form a pin5 pin, which is used to connect to the positive pole of the 24V / 48V power supply, one end of the second negative line is used to connect to the GND pin of the current sensor chip, and the other end is used to connect to the low-voltage negative pole of the DC / DC transformer capable of transforming 24V / 48V into 12V, the high-voltage negative pole of the DC / DC transformer is used to form a pin6 pin, which is used to connect to the negative pole of the 24V / 48V power supply.

5. The current sensor box for a BMS system according to claim 1, characterized in that: It also includes a filtering structure, which is located on the second group of power supply lines. One end of the filtering structure is connected to the current sensor chip, and the other end is connected to the low-voltage side of the DC / DC transformer that can transform 24V / 48V to 12V.

6. The current sensor box for the BMS system according to claim 5, characterized in that: The filtering structure includes a first filter and a second filter, one end of the first filter is used to connect the Uc pin of the current sensor chip, and the other end is used to connect to the low-voltage positive pole of a DC / DC transformer capable of transforming 24V / 48V into 12V, and the high-voltage positive pole of the DC / DC transformer is used to form a pin5 pin for connecting to the positive pole of a 24V / 48V power supply; one end of the second filter is used to connect the GND pin of the current sensor chip, and the other end is used to connect to the low-voltage negative pole of a DC / DC transformer capable of transforming 24V / 48V into 12V, and the high-voltage negative pole of the DC / DC transformer is used to form a pin6 pin for connecting to the negative pole of a 24V / 48V power supply.

7. The current sensor box for a BMS system according to claim 1, characterized in that: When the terminal resistor is soldered on the PCB board, one end of the terminal resistor leads to the pin1 pin, and the other end of the terminal resistor leads to the pin2 pin.

8. The current sensor box for a BMS system according to claim 7, characterized in that: The resistance of the terminal resistor is 120Ω.

9. The current sensor box for a BMS system according to claim 1, characterized in that: The current sensor chip is a 12V Hall current sensor.

10. A BMS system, characterized in that: The invention comprises a current sensor box for a BMS system as claimed in any one of claims 1 to 9.

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