Main control board of battery management system and battery management system

Abstract

The utility model discloses a main control board of a battery management system and the battery management system, and belongs to the technical field of battery management. The main control board of the battery management system comprises a strong current board, a weak current board and a connector. A controller minimum system, a power supply module and a field signal acquisition module are arranged on the strong current plate; the power supply module and the field signal acquisition module are both connected with the controller minimum system; a communication module and an input and output module are arranged on the weak current plate; the connector is respectively connected with the strong current plate and the weak current plate; the communication module and the input and output module are connected with the controller minimum system through the connector. According to the utility model, the strong current board and the weak current board are separately arranged, so that the reliability and the safety of the main control board can be effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery management, in particular to a main control board of a battery management system and a battery management system. Background Art

[0002] At present, the main control board in the battery management system needs to integrate a large number of functional modules to support its battery management functions, such as various sensing signal acquisition modules and communication modules, etc., making the circuit structure of the main control board complex and the wiring complicated, and signal interference is likely to occur between different functional modules; moreover, the voltage levels of different functional modules are not the same, affecting the safety of the main control board. Therefore, the reliability and safety of the main control board in the current battery management system are poor. Content of the Utility Model

[0003] The utility model provides a main control board of a battery management system and a battery management system. By separately arranging the high-voltage board and the low-voltage board, the reliability and safety of the main control board can be effectively improved.

[0004] In the first aspect, an embodiment of the utility model provides a main control board of a battery management system, including:

[0005] A high-voltage board; a controller minimum system, a power supply module and a field signal acquisition module are arranged on the high-voltage board; both the power supply module and the field signal acquisition module are connected to the controller minimum system;

[0006] A low-voltage board; a communication module and an input / output module are arranged on the low-voltage board;

[0007] A connector, which is respectively connected to the high-voltage board and the low-voltage board; both the communication module and the input / output module are connected to the controller minimum system through the connector.

[0008] Optionally, the power supply module includes: a power input interface, a DCDC converter, an isolated power supply chip and a first power conversion chip connected in sequence; the first power conversion chip is connected to the controller minimum system.

[0009] Optionally, the power supply module further includes: a second power conversion chip and a Hall power supply interface; the second power conversion chip is respectively connected to the isolated power supply chip and the Hall power supply interface.

[0010] Optionally, the field signal acquisition module includes:

[0011] A temperature acquisition unit, including: a temperature interface and a temperature acquisition circuit; the temperature acquisition circuit is respectively connected to the temperature interface and the controller minimum system;

[0012] And / or, a current acquisition unit, comprising: a current acquisition interface, a first operational amplifier circuit, and a first analog-to-digital conversion circuit connected in sequence; the first analog-to-digital conversion circuit is connected to the controller minimum system;

[0013] And / or, an insulation detection unit, comprising: a group terminal voltage negative interface, a group terminal voltage positive interface, an insulation acquisition interface, a positive insulation detection circuit, a negative insulation detection circuit, a second operational amplifier circuit, and a second analog-to-digital conversion circuit; the group terminal voltage negative interface is connected to the negative insulation detection circuit, the group terminal voltage positive interface is connected to the positive insulation detection circuit, and the insulation acquisition interface is respectively connected to the positive insulation detection circuit and the negative insulation detection circuit, both the positive insulation detection circuit and the negative insulation detection circuit are connected to the second operational amplifier circuit, the second operational amplifier circuit is connected to the second analog-to-digital conversion circuit, and the second analog-to-digital conversion circuit is connected to the controller minimum system.

[0014] Optionally, the field signal acquisition module further comprises: a signal isolation circuit;

[0015] Wherein, the current acquisition unit is included in the field signal acquisition module, and the first analog-to-digital conversion circuit is connected to the controller minimum system through the signal isolation circuit;

[0016] And / or,

[0017] The insulation detection unit is included in the field signal acquisition module, and the second analog-to-digital conversion circuit is connected to the controller minimum system through the signal isolation circuit.

[0018] Optionally, the high-voltage board further comprises: a watchdog circuit and a selection jumper, and the selection jumper is connected between the watchdog circuit and the controller minimum system.

[0019] Optionally, the input / output module comprises:

[0020] An output unit, comprising: a plurality of dry contact circuits, a plurality of low-side output circuits, a first output interface, and a second output interface; each of the dry contact circuits and each of the low-side output circuits are connected to the controller minimum system through the connector, some of the dry contact circuits are connected to the first output interface, and the remaining dry contact circuits and each of the low-side output circuits are connected to the second output interface;

[0021] An input unit, comprising: an input interface, an address assignment circuit, and an isolation circuit; both the address assignment circuit and the isolation circuit are connected to the controller minimum system through the connector, and both the address assignment circuit and the isolation circuit are connected to the input interface.

[0022] Optionally, the communication module includes: a multi-channel RS485 communication circuit, a multi-channel CAN communication circuit, a first communication interface, and a second communication interface; each of the RS485 communication circuits and each of the CAN communication circuits are connected to the controller minimum system through the connector, a part of the RS485 communication circuits and a part of the CAN communication circuits are both connected to the first communication interface, and the remaining RS485 communication circuits and the remaining CAN communication circuits are both connected to the second communication interface.

[0023] Optionally, the high-voltage board and the low-voltage board are stacked, and the connector is disposed between the high-voltage board and the low-voltage board.

[0024] In a second aspect, an embodiment of the present invention provides a battery management system, including: the main control board of the battery management system provided in any embodiment of the present invention.

[0025] In the main control board of the battery management system provided by the embodiment of the present invention, the high-voltage board and the low-voltage board are separately arranged, and a connector is used to connect the high-voltage board and the low-voltage board. Among them, the functional modules connecting external devices with a high voltage level in the main control board are mainly integrated on the high-voltage board, and the functional modules connecting external devices with a low voltage level are mainly integrated on the low-voltage board. By dividing the high-voltage and low-voltage boards, the embodiment of the present invention separately arranges functional modules with different voltage levels, which can effectively reduce the coupling and interference between high-voltage and low-voltage signals, and reduce the risk that the failure of high-voltage-level functional modules affects low-voltage-level functional modules. Moreover, the high-voltage and low-voltage boards can be separately and independently subjected to fault detection, which is beneficial to the later maintenance of the main control board. Therefore, the embodiment of the present invention can effectively improve the reliability and safety of the main control board.

[0026] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present invention, nor is it used to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0028] Figure 1 is a schematic structural diagram of a main control board of a battery management system provided by an embodiment of the present invention;

[0029] Figure 2It is a schematic structural diagram of the main control board of another battery management system provided by an embodiment of the present utility model.

[0030] In the figure:

[0031] 10, high-voltage board; 110, minimum controller system; 120, power supply module; 130, field signal acquisition module; 20, low-voltage board; 210, input / output module; 220, communication module; 30, connector; 310, plug-in unit

[0032] 21, DCDC converter; 22, isolated power supply chip; 23, first power conversion chip; 24, second power conversion chip; 131, temperature acquisition unit; 132, current acquisition unit; 133, insulation detection unit; 31, temperature acquisition circuit; 32, negative pole insulation detection circuit; 33, positive pole insulation detection circuit; 34, signal isolation circuit; OP1, first operational amplifier circuit; OP2, second operational amplifier circuit; ADC1, first analog-to-digital conversion circuit; ADC2, second analog-to-digital conversion circuit; 41, watchdog circuit; 42, selection jumper

[0033] 211, output unit; 212, input unit; 51, first dry contact circuit; 52, second dry contact circuit; 53, low-side output circuit; 61, address allocation circuit; 62, isolation circuit; 485-0, first RS485 communication circuit; 485-1, second RS485 communication circuit; CAN0, first CAN communication circuit; CAN1, second CAN communication circuit; CAN2, third CAN communication circuit

[0034] J1, power input interface; J2, Hall power supply interface; J3, temperature interface; J4, current acquisition interface; J5, negative pole interface of battery pack voltage; PE, insulation acquisition interface; J6, positive pole interface of battery pack voltage; J7, first output interface; J8, second output interface; J9, input interface; J10, first communication interface; J11, second communication interface. Detailed implementation manners

[0035] In order to enable those skilled in the art to better understand the solution of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0036] It should be noted that the terms "first", "second", etc. in the description, claims and above-mentioned drawings of the present utility model are used to distinguish similar objects and do not necessarily describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so that the embodiments of the present utility model described here can be implemented in an order other than those illustrated or described here. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion.

[0037] An embodiment of the present utility model provides a main control board of a battery management system, which has good anti-interference performance and safety. Figure 1 It is a schematic structural diagram of a main control board of a battery management system provided by an embodiment of the present utility model. Refer to Figure 1 , the main control board includes: a high-voltage board 10, a low-voltage board 20 and a connector 30. Among them, a controller minimum system 110, a power supply module 120 and a field signal acquisition module 130 are arranged on the high-voltage board 10; both the power supply module 120 and the field signal acquisition module 130 are connected to the controller minimum system 110. A communication module 220 and an input / output module 210 are arranged on the low-voltage board 20. The connector 30 is respectively connected to the high-voltage board 10 and the low-voltage board 20; both the communication module 220 and the input / output module 210 are connected to the controller minimum system 110 through the connector 30.

[0038] Among them, the controller minimum system 110 is the core processing component in the main control board, which can be considered as the collection of a controller chip and its minimum peripheral circuits and components required for basic operation; the controller chip is, for example, a microcontroller unit (MCU). The power supply module 120 can be connected to an external power supply and convert the power signal provided by the external power supply into the voltage required by each functional module in the main control board to meet the power supply requirements of each functional module in the main control board. The main control board can be arranged on-site, for example, and the field signal acquisition module 130 can be connected to various sensors arranged on-site to convert the received sensor signals into signals that the controller minimum system 110 can recognize; the field signal acquisition module 130 can receive, for example, the temperature signal, voltage signal and current signal of the battery pack, etc. In summary, the external devices connected to the high-voltage board 10 include an external power supply and various sensors installed on-site for signal acquisition. The voltage levels of the above-mentioned external devices are usually relatively high, and the high-voltage board 10 is equivalent to a high-voltage board. It can be understood that setting the controller minimum system 110 on the high-voltage board 10 can ensure that the power supply and the signal transmission path are short, ensure the power supply stability and signal transmission reliability of the controller minimum system 110, and thus ensure the reliability of the main control board.

[0039] The communication module 220 can be connected to the communication component in the external device in a wired or wireless manner, enabling the main control board to communicate with the external device. The input / output module 210 can be connected to the control component in the external device and transmit switching signals, drive signals, etc. For example, the input / output module 210 can output switching signals to control the on / off state of switching components such as external relays, and receive switching signals provided by the external device to control the working state of relevant functional modules in the main control board. Exemplarily, the external device connected to the weak current board 20 is, for example, a slave board in a battery management system. The main control board can control whether the slave board starts through the input / output module 210, and receive signals such as the temperature and voltage of battery cells collected by the slave board through the communication module 220. In summary, the weak current board 10 interacts with the connected external device for communication signals and switching / drive signals. The voltage levels borne by the relevant interfaces for implementing the above functions are relatively low, and the weak current board 20 is equivalent to a low-voltage board.

[0040] The connector 30, as a connection component between the high-voltage board 10 and the weak current board 20, can include at least one connecting member; both the communication module 220 and the input / output module 210 are connected to the relevant connecting members through the wiring on the weak current board 20, and the controller minimum system 110 is connected to each connecting member through the wiring on the high-voltage board 10. The type and quantity of the connecting members can be selected according to actual requirements and are not limited here. It can be understood that when the functional modules of the weak current board 20 need to be connected to other functional modules in the high-voltage board 10, the connection is also achieved through the connector 30.

[0041] In the main control board of the battery management system provided by the embodiment of the present invention, the high-voltage board 10 and the weak current board 20 are separately arranged, and the connector 30 is used to connect the high-voltage board 10 and the weak current board 20. Among them, the functional modules connecting external devices with high voltage levels in the main control board are mainly integrated in the high-voltage board 10, and the functional modules connecting external devices with low voltage levels are mainly integrated in the weak current board 20. By dividing the high-voltage and weak current boards in the embodiment of the present invention and separately arranging functional modules with different voltage levels, the coupling and interference between high-voltage and weak current signals can be effectively reduced, and the risk that the failure of high-voltage level functional modules affects low-voltage level functional modules can be reduced. Moreover, the high-voltage and weak current boards can be separately and independently subjected to fault detection, which is beneficial to the later maintenance of the main control board. Therefore, the embodiment of the present invention can effectively improve the reliability and safety of the main control board.

[0042] Based on the above embodiments, optionally, the controller chip in the controller minimum system 110 can use domestic chips. Compared with using imported chips, it can effectively improve the cost performance and safety of the main control board product. Exemplarily, the main control board can collect the total voltage, current and temperature of the battery pack through the on-site signal acquisition module 130; and receive the information of the single cells collected by each slave board through the communication module 220; the above parameter information is all collected to the controller minimum system 110 for processing. Based on the above process, the main control board can be used to control and manage the information of the entire battery pack, collect the total voltage, current and temperature of the entire battery pack, collect the information of the single cells, and alarm and protect against the abnormalities of the battery pack. Specifically, the main control board can protect the battery pack according to the requirements of relevant safety processing rules to ensure the safe and stable operation of the battery pack; when abnormal fault conditions such as severe overvoltage, undervoltage, overcurrent, and leakage of the battery occur, the main control board can issue control instructions through the communication module 220 and / or issue drive control signals through the input / output module 210 to control the on / off of the entire battery pack and avoid overcharging, over-discharging and overcurrent of the battery.

[0043] Based on the above embodiments, optionally, the power board 10 and the weak current board 20 are stacked, and the connector 30 is arranged between the power board 10 and the weak current board 20. Refer to Figure 2 , exemparily, the connector 30 may include at least one (illustrated as 2) plug 310, which is arranged on the side of the power board 10 close to the weak current board 20 and the side of the weak current board 20 close to the power board 10 to realize the plugging of the power board 10 and the weak current board 20. Among them, the connection relationship between the functional modules in the weak current board 20 and each plug 310 can be arranged according to actual needs. For example, try to set the connection lines between each functional module and the corresponding plug 310 to be shorter and there is no intersection between the connection lines. Exemplarily, the controller minimum system 110, the power supply module 120 and the on-site signal acquisition module 130 can be arranged on the side of the power board 10 close to the weak current board 20, and the communication module 220 and the input / output module 210 can be arranged on the side of the weak current board 20 far from the power board 10, but it is not a limitation to the present invention. The components in the power board 10 and the weak current board 20 can be arranged on the same side or both sides of the board as needed.

[0044] In this embodiment, by stacking the power board 10 and the weak current board 20 to form the main control board with a double-layer board structure, the product size can be effectively reduced, which is beneficial to on-site installation. Exemplarily, the shape and size of the power board 10 and the weak current board 20 can be the same and completely overlapped to minimize the product size as much as possible.

[0045] The main functional modules in the main control board are described in the above embodiments. Next, in combination with Figure 2, the possible structures of each functional module will be described by way of example, but it is not a limitation to the present utility model. First, the specific structure of the high-voltage board 10 will be described below, and then the specific structure of the low-voltage board 20 will be described.

[0046] Referring to Figure 2 , in one embodiment, optionally, the power supply module 120 includes: a power input interface J1, a DCDC converter 21, an isolated power supply chip 22, and a first power conversion chip 23 connected in sequence. Among them, the power input interface J1 is used to connect a DC power supply, such as connecting a ±24V power supply; the first power conversion chip 23 is connected to the controller minimum system 110. The DCDC converter 21 can, for example, step down the power signal provided by the DC power supply. The isolation power supply chip 22 is provided to ensure power supply safety. The first power conversion chip 23 can, for example, output a 3.3V voltage to supply power to the controller minimum system 110. It can be understood that the first power conversion chip 23 can also supply power to other components that require the same power supply voltage as the controller minimum system 110. Moreover, other power conversion chips can also be included in the power supply module 120 to supply power to components on the main control board that require other power supply voltages.

[0047] Based on the above embodiments, optionally, the power supply module 120 further includes: a second power conversion chip 24 and a Hall power supply interface J2; the second power conversion chip 24 is respectively connected to the isolated power supply chip 22 and the Hall power supply interface J2. Among them, the Hall power supply interface J2 can be used to connect a Hall current sensor, and the second power conversion chip 24 outputs a ±12V power signal to supply power to the Hall current sensor, for example. The Hall current sensor can be used to detect the bus current of the DC bus connected to the battery pack.

[0048] Based on the above embodiments, optionally, the power supply module 120 further includes: a wake-up circuit (not shown in the figure). The input end of the wake-up circuit accesses a power supply control signal, and the output end of the wake-up circuit is connected to the enable end of the DCDC converter 21. The wake-up circuit is used to control whether the DCDC converter 21 is enabled according to the power supply control signal. Among them, the power supply control signal can be provided by the host computer in the battery management system or a power supply control button. With such a setting in this embodiment, the DCDC converter 21 can be disabled when the main control board is in a long-term standby or idle state, so that the main control board goes into sleep and operates in the lowest power consumption state, thereby reducing the power consumption of the main control board. When the main control board needs to resume operation, the DCDC converter 21 can be enabled through the wake-up circuit to wake up the main control board. Exemplarily, the power supply voltage of the power supply connected to the power input interface J1 is DC24V±10% Vdc. Under this mechanism, it can be ensured that the power consumption of the main control board is less than 3W.

[0049] Continue to refer to Figure 2In one embodiment, optionally, the field signal acquisition module 130 includes: a temperature acquisition unit 131. The temperature acquisition unit 131 specifically includes: a temperature interface J3 and a temperature acquisition circuit 31; the temperature acquisition circuit 31 is respectively connected to the temperature interface J3 and the controller minimum system 110. Among them, the temperature interface J3 is used to connect the temperature sensor arranged on site, and the temperature sensor is arranged, for example, around the battery pack; illustratively, multiple groups (for example, four groups) of connecting pins can be set in the temperature interface J3, and each group of connecting pins is connected to a temperature sensor to realize the acquisition of multiple temperature signals. The temperature sensor includes, for example, a thermistor, which can specifically be a negative temperature coefficient thermistor (Negative Temperature Coefficient thermistor, NTC). The temperature acquisition circuit 31 is used to convert the signal collected by the temperature interface J3 into a signal recognizable by the controller minimum system 110; the temperature acquisition circuit 31 is, for example, an NTC circuit.

[0050] In another embodiment, optionally, the field signal acquisition module 130 includes: a current acquisition unit 132. The current acquisition unit 132 specifically includes: a current acquisition interface J4, a first operational amplifier circuit OP1 and a first analog-to-digital conversion circuit ADC1 connected in sequence. Among them, the current acquisition interface J4 can be used to connect a shunt, and the shunt can be set on the DC bus connected to the battery pack to detect the bus current; the first analog-to-digital conversion circuit ADC1 is connected to the controller minimum system 110. Exemplarily, the first operational amplifier circuit OP1 may include a low-offset single operational amplifier and its peripheral circuits, and the first analog-to-digital conversion circuit ADC1 may include an analog-to-digital converter and its peripheral circuits. This embodiment is configured in this way, in conjunction with the Hall current sensor related interfaces and circuits mentioned in the above-mentioned embodiments, which is equivalent to providing two bus current detection methods, which is conducive to improving the compatibility and applicability of the main control board.

[0051] In yet another embodiment, optionally, the on-site signal acquisition module 130 includes: an insulation detection unit 133. Specifically, the insulation detection unit 133 may include: a group terminal voltage negative interface J5, a group terminal voltage positive interface J6, an insulation acquisition interface PE, a positive insulation detection circuit 33, a negative insulation detection circuit 32, a second operational amplifier circuit OP2, and a second analog-to-digital conversion circuit ADC2. Among them, the group terminal voltage negative interface J5 can be connected to the negative pole of the battery pack to obtain the group terminal negative voltage, the group terminal voltage positive interface J6 can be connected to the positive pole of the battery pack to obtain the group terminal positive voltage, and the insulation acquisition interface PE can be connected to the insulation terminal (such as the outer shell) of the device powered by the battery pack to obtain the insulation terminal voltage. The group terminal voltage negative interface J5 is connected to the negative insulation detection circuit 32, the group terminal voltage positive interface J6 is connected to the positive insulation detection circuit 33, the insulation acquisition interface PE is respectively connected to the positive insulation detection circuit 33 and the negative insulation detection circuit 32, both the positive insulation detection circuit 33 and the negative insulation detection circuit 32 are connected to the second operational amplifier circuit OP2, the second operational amplifier circuit OP2 is connected to the second analog-to-digital conversion circuit ADC2, and the second analog-to-digital conversion circuit ADC2 is connected to the controller minimum system 110. The output result of the positive insulation detection circuit 33, for example, characterizes the insulation resistance of the positive pole of the battery pack, and the output result of the negative insulation detection circuit 32, for example, characterizes the insulation resistance of the negative pole of the battery pack. Two sets of operational amplifiers (such as low-offset single operational amplifiers) can be respectively set in the second operational amplifier circuit OP2 to respectively process the output results of the positive insulation detection circuit 33 and the negative insulation detection circuit 32; and, two sets of analog-to-digital converters can be respectively set in the second analog-to-digital conversion circuit ADC2 to respectively process the output results of the two sets of operational amplifiers.

[0052] It can be understood that one or more of the above temperature acquisition unit 131, current acquisition unit 132, and insulation detection unit 133 can be configured as needed in the on-site signal acquisition module 130.

[0053] Based on the above embodiments, optionally, the on-site signal acquisition module 130 includes a current acquisition unit 132 and an insulation detection unit 133. Further, the on-site signal acquisition module 130 further includes: a signal isolation circuit 34. The first analog-to-digital conversion circuit ADC1 in the current acquisition unit 132 and / or the second analog-to-digital conversion circuit ADC2 in the insulation detection unit 133 can be connected to the controller minimum system 110 through the signal isolation circuit 34 to achieve isolation between different signals, avoid mutual interference between different signals, and improve the anti-interference ability of the main control board. The isolation circuit 34 can adopt any form of signal isolation circuit, such as an IIC (Inter-Integrated Circuit) isolator.

[0054] Continue to refer to Figure 2, based on the above embodiments, optionally, the high-voltage board 10 may further include: a watchdog circuit 41 and a selection jumper 42, and the selection jumper 42 is connected between the watchdog circuit 41 and the controller minimum system 110. Among them, whether to provide the watchdog function to the controller minimum system 110 can be selected through the selection jumper 42; when the watchdog circuit 41 is enabled, the watchdog function can be set to control the controller minimum system 110 to reset when no watchdog signal is received from the controller minimum system 110 within a preset period, so as to avoid the influence of faults such as program runaway.

[0055] The detailed structure of the high-voltage board 10 has been described in the above embodiments. Next, the structure of the low-voltage board 20 will be described.

[0056] Continue to refer to Figure 2 , in one embodiment, optionally, the input / output module 210 includes: an output unit 211 and an input unit 212.

[0057] Specifically, the output unit 211 includes: a multi-channel dry contact circuit, a multi-channel low-side output circuit, a first output interface J7, and a second output interface J8. Among them, each dry contact circuit and each low-side output circuit are connected to the controller minimum system 110 through a connector 30; some dry contact circuits are connected to the first output interface J7, and the remaining dry contact circuits and each low-side output circuit are connected to the second output interface J8. In this way, multi-channel and multi-type signal output can be realized, ensuring the control ability of the main control board for external devices. Exemplarily, different dry contact circuits can be respectively connected to different pins in the first output interface J7, and the dry contact circuit and the low-side output circuit can be respectively connected to different pins in the second output interface J8 to avoid signal competition.

[0058] Exemplarily, two dry contact circuits and six low-side output circuits can be configured in the low-voltage board 20. As Figure 2 shown, it can be set that the second dry contact circuit 52 is connected to the first output interface J7, and the first dry contact circuit 51 and each low-side output circuit 53 are respectively connected to different pins in the second output interface J8.

[0059] The input unit 212 may include: an input interface J9, an address allocation circuit 61, and an isolation circuit 62; both the address allocation circuit 61 and the isolation circuit 62 are connected to the controller minimum system 110 through a connector 30, and both the address allocation circuit 61 and the isolation circuit 62 are connected to the input interface J9. Among them, the address allocation circuit 61 can be used to parse the signal source address; the isolation circuit 62 is used to isolate the external signal and then transmit it to the controller minimum system 110 to ensure the safety of the main control board and avoid introducing the faults of external devices into the main control board. The isolation circuit 62 is, for example, an isolation switch input circuit and is composed of isolation devices such as optocouplers. Exemplarily, the address allocation circuit 61 and the isolation circuit 62 can be respectively connected to different pins in the input interface J9 to avoid signal competition. Among them, the address allocation circuit 61 can be connected to the address line in the system through the input interface J9, and the isolation circuit 62 can be connected to six groups of pins in the input interface J9 for receiving six-way input signals.

[0060] Continue to refer to Figure 2 , in one embodiment, optionally, the communication module 220 includes: a multi-channel RS485 communication circuit, a multi-channel CAN communication circuit, a first communication interface J10, and a second communication interface J11; each RS485 communication circuit and each CAN communication circuit are connected to the controller minimum system 110 through a connector 30, a part of the RS485 communication circuits and a part of the CAN communication circuits are both connected to the first communication interface J10, and the remaining RS485 communication circuits and the remaining CAN communication circuits are both connected to the second communication interface J11. This setting in this embodiment enables the main control board to be compatible with both RS485 and CAN communication methods, effectively improving the applicable range of the main control board.

[0061] Exemplarily, it can be set that a part of the RS485 communication circuits and a part of the CAN communication circuits are respectively connected to different pins in the first communication interface J10, and the remaining RS485 communication circuits and the remaining CAN communication circuits are respectively connected to different pins in the second communication interface J11 to avoid signal competition. Specifically, refer to Figure 2 , two RS485 communication circuits and three CAN communication circuits can be configured in the weak current board 20; it can be set that the first CAN communication circuit CAN0, the third CAN communication circuit CAN2, and the second RS485 communication circuit 485-1 are connected to the first communication interface J10, and the second CAN communication circuit CAN1 and the first RS485 communication circuit 485-0 are connected to the second communication interface J11.

[0062] Based on Figure 2The main control board shown has 6 low-side outputs, 2 dry contact outputs, and 6 inputs configurable on one side of the weak current board 20; 3 CAN transmissions and 2 RS485 transmissions. The basic functions of the main control board include but are not limited to: real-time monitoring of the terminal voltage, current, temperature, and insulation resistance of the battery pack; real-time calculation of the SOC (State of Charge) and SOH (State of Health) of the entire battery pack; real-time receiving and uploading of data and alarm information, enabling remote monitoring of the battery pack; the supply voltage of the DC power supply is DC24V ± 10% Vdc, and the power consumption is less than 3W.

[0063] In summary, in the main control board provided by the embodiment of the present invention, by separating the strong and weak current boards, the anti-interference performance of the main control board can be better. Compared with the traditional main control boards applicable to most application scenarios, the main control board provided by the embodiment of the present invention simplifies the functional modules, retains the functional modules required when applied to the battery management system. Each functional module in this main control board is necessary in battery management, and each interface can have a high utilization rate in application. Combined with the setting of the double-layer board structure of the main control board, the product size can be effectively reduced, and it is beneficial for on-site installation. Moreover, domestic chips can be selected as the raw materials for each functional module in this main control board, which can effectively improve the cost performance, safety, and market competitiveness of the product.

[0064] It should be noted that for the strong current board 10 and the weak current board 20, for the convenience of display, Figure 2 the interfaces and circuits on the board are divided by dotted lines in both. Each interface is the part of the board connecting to external devices, and each circuit is the functional circuit arranged to realize the actual functions of the board and is connected to each interface. It can be understood that Figure 2 only for exemplary display, and it is not the actual circuit layout structure of the main control board. When actual wiring is carried out on the strong current board 10 and the weak current board 20, the relative positions of each circuit and interface can be adjusted according to the actual situation. For example, the connection lines between the functional circuit and the corresponding interface can be set as short as possible to simplify the wiring of the main control board.

[0065] The embodiment of the present invention also provides a battery management system, including the main control board provided by any embodiment of the present invention, and has corresponding beneficial effects. Exemplarily, this battery management system can be a multi-level architecture battery management system, including a main control board and multiple slave boards. The main control board can be used to monitor the state parameters such as the voltage, current, temperature, and insulation of the entire battery pack, and the slave board can be used to monitor the state parameters such as the voltage and temperature of the battery cells in the battery pack. The control part of the switch component connected to the battery pack, the upper computer, and the slave board can all be connected to the main control board through the interfaces in the weak current board. For example, signal interaction can be carried out with the controller minimum system through the input / output module, and / or signal interaction can be carried out with the controller minimum system through the communication module.

[0066] The above specific embodiments do not constitute a limitation to the protection scope of the present utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A main control board of a battery management system, characterized in that: include: A strong power board; the strong power board is provided with a minimum controller system, a power module and a field signal acquisition module; the power module and the field signal acquisition module are both connected to the minimum controller system; Weak current board; the weak current board is provided with a communication module and an input / output module; The connector is respectively connected to the strong current board and the weak current board; the communication module and the input-output module are both connected to the controller minimum system through the connector.

2. The main control board of the battery management system according to claim 1, characterized in that: The power module comprises: a power input interface, a DCDC converter, an isolation power chip and a first power conversion chip which are connected in sequence; the first power conversion chip is connected to the controller minimum system.

3. The main control board of the battery management system according to claim 2, characterized in that: The power module further includes: a second power conversion chip and a Hall power supply interface; the second power conversion chip is connected to the isolation power chip and the Hall power supply interface respectively.

4. The main control board of the battery management system according to claim 1, characterized in that: The field signal acquisition module comprises: The temperature acquisition unit comprises: a temperature interface and a temperature acquisition circuit; the temperature acquisition circuit is respectively connected to the temperature interface and the controller minimum system; And / or, a current acquisition unit, comprising: a current acquisition interface, a first operational amplifier circuit and a first analog-to-digital conversion circuit connected in sequence; the first analog-to-digital conversion circuit is connected to the controller minimum system; And / or, an insulation detection unit, comprising: a group end voltage negative electrode interface, a group end voltage positive electrode interface, an insulation acquisition interface, a positive electrode insulation detection circuit, a negative electrode insulation detection circuit, a second operational amplifier circuit and a second analog-to-digital conversion circuit; the group end voltage negative electrode interface is connected to the negative electrode insulation detection circuit, the group end voltage positive electrode interface is connected to the positive electrode insulation detection circuit, and the insulation acquisition interface is respectively connected to the positive electrode insulation detection circuit and the negative electrode insulation detection circuit, the positive electrode insulation detection circuit and the negative electrode insulation detection circuit are both connected to the second operational amplifier circuit, the second operational amplifier circuit is connected to the second analog-to-digital conversion circuit, and the second analog-to-digital conversion circuit is connected to the controller minimum system.

5. The main control board of the battery management system according to claim 4, characterized in that: The field signal acquisition module further includes: a signal isolation circuit; Wherein, the field signal acquisition module includes the current acquisition unit, and the first analog-to-digital conversion circuit is connected to the controller minimum system through the signal isolation circuit; and / or, The field signal acquisition module includes the insulation detection unit, and the second analog-to-digital conversion circuit is connected to the controller minimum system through the signal isolation circuit.

6. The main control board of the battery management system according to claim 1, characterized in that: The high-voltage board also includes: a watchdog circuit and a selection jumper, wherein the selection jumper is connected between the watchdog circuit and the minimum system of the controller.

7. The main control board of the battery management system according to claim 1, characterized in that: The input-output module comprises: An output unit, comprising: a plurality of dry contact circuits, a plurality of low-side output circuits, a first output interface and a second output interface; each of the dry contact circuits and each of the low-side output circuits are connected to the controller minimum system through the connector, some of the dry contact circuits are connected to the first output interface, and the remaining dry contact circuits and each of the low-side output circuits are connected to the second output interface; The input unit comprises: an input interface, an address allocation circuit and an isolation circuit; the address allocation circuit and the isolation circuit are both connected to the controller minimum system through the connector, and the address allocation circuit and the isolation circuit are both connected to the input interface.

8. The main control board of the battery management system according to claim 1, characterized in that: The communication module includes: multiple RS485 communication circuits, multiple CAN communication circuits, a first communication interface and a second communication interface; each of the RS485 communication circuits and each of the CAN communication circuits are connected to the controller minimum system through the connector, some of the RS485 communication circuits and some of the CAN communication circuits are connected to the first communication interface, and the remaining RS485 communication circuits and the remaining CAN communication circuits are connected to the second communication interface.

9. The main control board of the battery management system according to any one of claims 1 to 8, characterized in that: The strong current board and the weak current board are stacked, and the connector is arranged between the strong current board and the weak current board.

10. A battery management system, characterized in that: include: The main control board of the battery management system according to any one of claims 1 to 9.

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