BMS all-in-one machine device

Abstract

The embodiment of the utility model discloses a BMS all-in-one machine device. The device comprises a sampling unit connected with a battery pack, a main control unit and an onboard relay, the sampling unit is used for collecting key parameters such as voltage, current and temperature of the battery pack in real time; the main control unit is used for monitoring, controlling and protecting the state of the battery according to the data acquired by the sampling unit and outputting a corresponding control signal; the on-board relay is used for realizing the starting and pre-charging functions of the battery according to the control signal and limiting the size of the initial current of the battery, and the sampling unit, the main control unit and the on-board relay are respectively mounted on a BMS (Battery Management System) board. By implementing the device provided by the embodiment of the utility model, the cost can be reduced, the BOM (Bill of Material) cost of a single board is reduced, and the product reliability is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to energy electron technology field especially relates to a BMS all -in -one device. BACKGROUND

[0002] The existing battery management system mainly integrates high pressure acquisition module and logic control module, however, the key components in the battery box such as relay, pre-charging resistance and fuse are usually not placed directly on the BMS board card. This design requires the battery box to reserve additional space to place these components, thereby increasing the assembly and post-sale complexity, and at the same time, due to the need for more materials and more complex design, the overall cost of the whole PACK also rises.

[0003] Therefore, it is necessary to design a new device to reduce the cost, reduce the single-board BOM cost, and ensure product reliability. UTILITY MODEL CONTENT

[0004] The utility model aims at overcoming the defects of prior art, and provides a BMS all -in -one device.

[0005] To solve the above technical problems, the utility model aims at realizing the following technical scheme: provide a BMS all -in -one device, including: the sampling unit, main control unit and on-board relay connected with battery pack, the sampling unit is used for real -time acquisition to the voltage, current, temperature key parameter of battery pack, the main control unit is used for the monitoring, control and protection of battery state according to the data acquisition of the sampling unit, and the corresponding control signal is output, the on-board relay is used for realizing the start of battery, the pre-charging function of battery according to the control signal, and the size of the initial current of battery is limited, wherein the sampling unit, main control unit and on-board relay are installed on the BMS board respectively.

[0006] Its further technical scheme is that the main control unit includes main control chip UMCU1.

[0007] Its further technical scheme is that the main control chip UMCU1 is further connected with power supply circuit, power supply wake-up sleep circuit and IO detection circuit, and the power supply wake-up sleep circuit and IO detection circuit are connected with the power supply circuit respectively.

[0008] Its further technical scheme is that the main control chip UMCU1 is further connected with first CAN communication module and second CAN communication module.

[0009] A further technical scheme is that the sampling unit comprises a total battery current acquisition subunit, a single battery voltage acquisition subunit, an equalization temperature acquisition subunit and a temperature acquisition subunit, the total battery current acquisition subunit, the single battery voltage acquisition subunit, the equalization temperature acquisition subunit and the temperature acquisition subunit are connected with the master control unit respectively, the total battery current acquisition subunit is used for acquiring total battery current, the single battery voltage acquisition subunit is used for acquiring voltage of a single battery, the equalization temperature acquisition subunit is used for acquiring temperature when the single battery is passively equalized, and the temperature acquisition subunit is used for acquiring temperature of all battery groups.

[0010] A further technical scheme is that the BMS further comprises an RTC timing unit, and the RTC timing unit is connected with the master control unit.

[0011] A further technical scheme is that the sampling unit further comprises a pre-charging detection subunit, and the pre-charging detection subunit is connected with the master control unit; the pre-charging detection subunit is used for detecting whether the battery group enters a pre-charging state.

[0012] A further technical scheme is that the on-board relay comprises a first driving circuit, a pre-charging resistor and a pre-charging relay; the first driving circuit is connected with the master control unit; the pre-charging relay is connected with the master control unit; and the pre-charging resistor is connected with the pre-charging relay.

[0013] A further technical scheme is that the on-board relay further comprises a main positive relay and a second driving circuit; the main positive relay is connected with the pre-charging resistor and the pre-charging relay respectively; and the second driving circuit is connected with a total power supply.

[0014] The utility model discloses a BMS board card, which comprises a sampling unit, a master control unit and an on-board relay.

[0015] The utility model discloses a BMS board card, which comprises a sampling unit, a master control unit and an on-board relay. DRAWINGS

[0016] In order to make the technical scheme of the embodiments of the utility model clearer, the drawings needed in the embodiment description will be briefly introduced as follows, and obviously, the drawings in the following description are some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to the drawings without any creative labor.

[0017] Figure 1A schematic block diagram of a BMS all-in-one machine device is provided for the embodiment of the utility model;

[0018] Figure 2 The specific circuit schematic diagram of the main control chip is provided for the embodiment of the utility model;

[0019] Figure 3 The specific circuit schematic diagram of the power supply circuit is provided for the embodiment of the utility model;

[0020] Figure 4 The specific circuit schematic diagram of the power supply wake-up sleep circuit is provided for the embodiment of the utility model;

[0021] Figure 5 The specific circuit schematic diagram of the IO detection circuit is provided for the embodiment of the utility model;

[0022] Figure 6 The specific circuit schematic diagram of the first CAN communication module is provided for the embodiment of the utility model;

[0023] Figure 7 The specific circuit schematic diagram of the second CAN communication module is provided for the embodiment of the utility model;

[0024] Figure 8 The specific circuit schematic diagram of the RTC timing unit is provided for the embodiment of the utility model;

[0025] Figure 9 The specific circuit schematic diagram of the pre-charge detection subunit and the battery total current acquisition subunit is provided for the embodiment of the utility model;

[0026] Figure 10 The specific circuit schematic diagram of the single body voltage acquisition subunit, the equalization temperature acquisition subunit and the temperature acquisition subunit is provided for the embodiment of the utility model;

[0027] Figure 11 The specific circuit schematic diagram of the on-board relay is provided for the embodiment of the utility model;

[0028] Figure 12 The specific circuit schematic diagram of the connection port is provided for the embodiment of the utility model Figure 1 ;

[0029] Figure 13 The specific circuit schematic diagram of the connection port is provided for the embodiment of the utility model Figure 2 ;

[0030] The identification in the drawing is explained:

[0031] 10, sampling unit; 20, main control unit; 30, on-board relay. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0033] It should be understood that the terms "comprise" and "include" as used in the specification and the appended claims indicate the presence of the described features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0034] It should also be understood that the terms used in the present application specification are only for the purpose of describing specific embodiments and are not intended to limit the present application. As used in the present application specification and the appended claims, the singular forms "a", "an" and "the" are intended to include the plural forms unless the context clearly indicates otherwise.

[0035] It should be further understood that the term "and / or" as used in the present application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes these combinations.

[0036] Please refer to Figure 1 , Figure 1 A schematic block diagram of a BMS all-in-one device provided by the embodiments of the present application, which can be applied in a battery management scene of lithium battery charging and discharging protection. The device of the present embodiment integrates relays, pre-charge resistors, fuses and other elements on a BMS board card, and is designed as an integrated product. At the same time, in order to reduce the bill of materials cost of the single board, domestic vehicle-grade chips, including a main control chip and a sampling chip, are adopted. In this way, not only the BOM cost of the single board is effectively reduced, but also the reliability of the product is ensured.

[0037] Please refer to Figure 1The application discloses a BMS all-in-one machine device which comprises a sampling unit 10 connected with a battery pack, a master control unit 20 and a board-mounted relay 30; the sampling unit 10 is used for collecting key parameters of voltage, current and temperature of the battery pack in real time; the master control unit 20 is used for monitoring, controlling and protecting the battery state according to the data collected by the sampling unit 10 and outputting corresponding control signals; the board-mounted relay 30 is used for realizing the starting of the battery and the pre-charging function of the battery according to the control signals and limiting the size of the initial current of the battery, wherein the sampling unit 10, the master control unit 20 and the board-mounted relay 30 are respectively installed on a BMS board.

[0038] In the embodiment, the sampling unit 10 is connected with the battery pack and collects key parameters of the battery pack in real time, including voltage, current and temperature. The sampling unit 10 obtains the data through sensors or measuring devices and transmits the data to the master control unit 20 for processing. The master control unit 20 monitors, controls and protects the battery state according to the data collected by the sampling unit 10. The master control unit 20 analyzes parameters such as voltage, current and temperature of the battery, judges the state of the battery such as the health condition of the battery, the charging and discharging state, the capacity and the like through a built-in algorithm and outputs corresponding control signals. The board-mounted relay 30 realizes the starting of the battery, the pre-charging function of the battery and the limitation of the size of the initial current of the battery according to the control signals output by the master control unit 20. The relay plays the role of a switch in the system, controls the charging and discharging process of the battery and ensures the safe operation of the battery.

[0039] In an embodiment, referring to Figure 2 The master control chip UMCU1 is included in the master control unit 20.

[0040] Secondly, the master control chip UMCU1 is further connected with a peripheral Flash and an EERPOM circuit.

[0041] In an embodiment, referring to Figures 3 to 5 The master control chip UMCU1 is further connected with a power supply circuit, a power supply wake-up and sleep circuit and an IO detection circuit, and the power supply wake-up and sleep circuit and the IO detection circuit are connected with the power supply circuit.

[0042] In the embodiment, referring to Figure 3 The power supply circuit comprises a power supply management chip UPW1, a power supply management chip UPW3 and a power supply management chip UPW2 which are sequentially connected. The power supply management chip UPW1 is further connected with a transformer TPW1 between the external power supply.

[0043] In an embodiment, referring to Figure 4The power supply wake-up sleep circuit comprises a triode QPW13 connected with the power supply circuit; the triode QPW13 is connected with the master control chip UMCU1; the triode QPW13 is further connected with a triode QPW11 and a triode QPW12; the triode QPW11 and the triode QPW12 are connected with the master control chip UMCU1; by controlling the conduction and the blockage of the triode QPW13, the triode QPW11 and the triode QPW12, the wake-up or the sleep of the power supply circuit is realized.

[0044] In an embodiment, referring to Figure 5 The IO detection circuit comprises an infrared sensor UGP1 connected with the IO interface; the infrared sensor UGP1 is connected with the master control chip UMCU1, so as to realize the detection of the connection state of the interface.

[0045] In an embodiment, referring to Figures 6 to 7 The master control chip UMCU1 is further connected with a first CAN communication module and a second CAN communication module.

[0046] In the embodiment, the first CAN communication module and the second CAN communication module can be modules such as Bluetooth and 5G.

[0047] In an embodiment, referring to Figures 9 to 10 The sampling unit 10 comprises a battery total current acquisition subunit, a single battery voltage acquisition subunit, an equalization temperature acquisition subunit and a temperature acquisition subunit; the battery total current acquisition subunit, the single battery voltage acquisition subunit, the equalization temperature acquisition subunit and the temperature acquisition subunit are connected with the master control unit 20; the battery total current acquisition subunit is used for acquiring the total current of the battery pack; the single battery voltage acquisition subunit is used for acquiring the voltage of the single battery; the equalization temperature acquisition subunit is used for acquiring the temperature when the single battery is passively equalized; and the temperature acquisition subunit is used for acquiring the temperature of all the battery packs.

[0048] In the embodiment, the sampling unit acquires and reports the total voltage and current information of the power battery in real time, realizes the time integration through the hardware circuit, provides accurate data for the calculation of the state of charge (SOC) and the state of health (SOH) of the mainboard, and realizes the pre-charge detection function; in addition, the sampling unit 10 acquires and reports the single battery voltage and temperature information of the power battery in real time, feeds back the SOH and SOC of each string of battery cells, and has a passive equalization function, so as to effectively ensure the consistency of the battery cells in the power use process.

[0049] Specifically, in the embodiment, referring to Figure 9The battery total current acquisition subunit comprises a rectifier bridge DSS2 and a rectifier bridge DSS1 connected with the main control chip UMCU1, and in addition, the rectifier bridge DSS2 and the rectifier bridge DSS1 are respectively connected with resistors RSS48, RSS49, RSS50, RSS51, RSS62-RSS67.

[0050] In an embodiment, referring to Figure 10 each single battery is connected with a passive equalization circuit, the passive equalization circuit is connected with a single voltage acquisition subunit, and the single voltage acquisition subunit is connected with an equalization management chip UVM1; wherein the passive equalization circuit comprises a plurality of resistors connected with each other, an output end connected after the resistors is connected with a transistor, and the transistor is connected with the single voltage acquisition subunit; wherein the single voltage acquisition subunit comprises a sampling resistor, and the sampling circuit is connected with the equalization management chip UVM1.

[0051] In addition, the equalization temperature acquisition subunit and the temperature acquisition subunit are respectively temperature sensors.

[0052] In an embodiment, referring to Figure 8 The BMS all-in-one device further comprises an RTC timing unit, and the RTC timing unit is connected with the main control unit 20.

[0053] In the embodiment, the RTC timing unit comprises an RTC timing chip URTC1, and the RTC timing chip URTC1 is connected with the main control chip UMCU1.

[0054] In an embodiment, referring to Figure 9 The sampling unit 10 further comprises a pre-charge detection subunit, and the pre-charge detection subunit is connected with the main control unit 20; the pre-charge detection subunit is used for detecting whether the battery pack enters a pre-charge state.

[0055] The pre-charge detection subunit comprises a magnetic core inductor and a resistor connected with each battery monomer; in addition, a filter capacitor and a resistor are connected in parallel at the low end of the resistor.

[0056] In the embodiment, the battery total current acquisition subunit is used for acquiring total current information of the whole battery pack. It realizes current detection through a rectifier bridge (DSS2 and DSS1) and a resistor network (RSS48, RSS49, etc.), and sends data to the main control chip UMCU1. The single voltage acquisition subunit is used for acquiring voltage information of each single battery, and is connected to the equalization management chip UVM1 for voltage data processing. The equalization temperature acquisition subunit is specially used for monitoring the temperature of the single battery when passive equalization is performed, so as to ensure the safety and effectiveness of the equalization process. The temperature acquisition subunit is used for acquiring temperature information of the whole battery pack, so as to ensure that the working environment of all battery units is within a safe range.

[0057] The sampling unit 10 can collect the total battery voltage, current, single cell voltage, temperature and other information in real time, and timely report to the main control unit 20; through the integral operation of the hardware circuit, accurate data is provided for the main control board to calculate the state of charge (SOC) and the state of health (SOH) of the battery; the pre-charge detection sub-unit is used to detect whether the battery pack enters the pre-charge state, and includes a magnetic core inductor, a resistor and a parallel filter capacitor and other elements; each single cell is connected with a passive balancing circuit, which realizes the balancing of the single cell through a resistor and a triode network, and maintains the consistency of the battery pack.

[0058] The RTC timing unit includes an RTC timing chip URTC1, which is used to provide accurate time recording and is connected with the main control chip UMCU1.

[0059] By collecting important parameters such as voltage, current and temperature in real time, it ensures that the system can accurately monitor the battery state, timely find and solve problems, and improve the overall reliability; accurate SOC and SOH calculation helps to optimize the battery usage strategy, avoid overcharging or discharging, and prolong the battery life; real-time monitoring of the temperature of the battery and the single cell helps to prevent safety problems caused by overheating; it ensures the safety of the battery pack when it enters the pre-charge state, and avoids charging operation under inappropriate conditions; through the passive balancing circuit, the voltage consistency of each single cell is maintained, and the overall performance decline caused by the performance difference of individual cells is avoided; accurate time recording is provided, which is helpful for data log recording and event tracking, and facilitates fault troubleshooting and system maintenance.

[0060] In summary, this battery management system realizes comprehensive monitoring and management of the battery pack and single cell through the cooperative work of multiple sub-units, not only improves the safety and reliability of the system, but also optimizes the use efficiency and life of the battery.

[0061] In this embodiment, the main control chip UMCU1 adopts a shunt to collect the current of the corresponding single cell.

[0062] The connection ports between the main control chip UMCU1 and other devices are as shown in Figure 12 The ground and other conditions of other devices are as shown in Figure 13 .

[0063] In an embodiment, please refer to Figure 11 The on-board relay 30 described above includes a first drive circuit, a pre-charge resistor and a pre-charge relay; the first drive circuit is connected with the main control unit 20; the pre-charge relay is connected with the main control unit 20; the pre-charge resistor is connected with the pre-charge relay.

[0064] In an embodiment, please refer to Figure 11The on-board relay 30 further comprises a main positive relay and a second driving circuit; the main positive relay is connected with a pre-charge resistor and a pre-charge relay respectively; the second driving circuit is connected with a total power supply.

[0065] In the embodiment, the first driving circuit comprises a transistor QSS2 connected with a pre-charge relay USS8, the pre-charge relay USS8 is connected with a pre-charge resistor RSS39, the pre-charge relay USS8 is connected with a P+ terminal; the pre-charge resistor RSS39 is connected with a B+ terminal, the P+ terminal of the PCB is short-circuited with a main positive relay contact P+_EX wire harness; the B+ terminal of the PCB is short-circuited with a main positive relay contact B+_EX wire harness; the main positive relay is connected with a second driving circuit USS3.

[0066] In the embodiment, the main function of the pre-charge circuit is to pre-charge the capacitor before connecting the high-voltage battery and the load through a current-limiting resistor, in order to prevent instantaneous large current from damaging the circuit. The first driving circuit (including the transistor QSS2) is responsible for controlling the on-off of the pre-charge relay USS8. The main control unit 20 sends a control signal to trigger the transistor QSS2 in the first driving circuit. When the transistor QSS2 is turned on, the pre-charge relay USS8 is turned on, and the pre-charge resistor RSS39 is connected to the circuit. The pre-charge resistor RSS39 is connected in series with the pre-charge relay USS8, which is used to limit the pre-charge current, so as to protect other elements in the circuit from being damaged by large current.

[0067] The function of the main positive relay is to directly connect the main power supply after the pre-charge is completed, in order to provide normal working current. The second driving circuit obtains energy from the total power supply and is responsible for controlling the on-off of the main positive relay. After the pre-charge is completed, the main control unit 20 will send a signal to make the main positive relay conduct through the second driving circuit. After receiving the signal of the second driving circuit, the main positive relay is turned on, and the battery pack is directly connected with the load, thereby providing normal working current.

[0068] The pre-charge relay USS8 is connected to the P+ terminal, and the pre-charge resistor RSS39 is connected to the B+ terminal. The P+ terminal of the PCB is short-circuited with the main positive relay contact P+_EX wire harness, and the B+ terminal of the PCB is short-circuited with the main positive relay contact B+_EX wire harness. This connection mode makes the pre-charge current pass through the pre-charge resistor RSS39 during the pre-charge stage; and after the pre-charge is completed, the main positive relay is turned on to realize the normal working state of large current.

[0069] The pre-charging circuit limits the initial current through the pre-charging resistor, effectively preventing damage to circuit components by large current surges, prolonging the service life of the components; the phased operation of the pre-charging circuit and the main positive relay ensures smooth transition of the circuit when connecting the load, reduces circuit failures caused by instantaneous large current, and improves the reliability of the system; by controlling the first drive circuit and the second drive circuit through the main control unit 20, the pre-charging and main power connection process is automated, without manual intervention, simplifying the system control logic; during the pre-charging process, current limiting is performed through the pre-charging resistor, which can avoid the consumption of a large amount of instantaneous electric energy and improve energy utilization efficiency; during the pre-charging stage, the presence of the pre-charging resistor ensures the controllability of the current, avoiding potential overcurrent risks and improving the safety of the system.

[0070] In the embodiment, the chips involved in the above can be domestic chips. Specifically, the model of the chip involved in the sampling unit is, but is not limited to, MP2796DFP; the model of the chip involved in the RTC timing unit is, but is not limited to, BM8563; the model of the chip of the power supply circuit is, but is not limited to, SY8301; the model of the main control chip UMCU1 is, but is not limited to, KF32F330KQTT; the model of the CAN transceiver chip involved in the first CAN communication module and the second CAN communication module is, but is not limited to, SIT1051AQT / 3; the model of the digital isolator chip involved in the figure is, but is not limited to, TPT7721; the model of the LDO power supply chip is, but is not limited to, TPL820F33-89TR; the model of the drive chip of the magnetic latching relay is, but is not limited to, GM8023A.

[0071] The BMS all-in-one device integrates multiple functional modules (such as the sampling unit 10, the main control unit 20, and the on-board relay 30) on the same PCB board. Through highly integrated design, the number of single-board materials and components can be reduced, thereby reducing production and assembly costs; the integrated main control chip UMCU1 can perform multiple functions, including data processing, control signal output, etc., which reduces the need for multiple independent control devices.

[0072] Efficient power management chips (such as UPW1, UPW3, UPW2) and other key components (such as transistors QPW13, QPW11, QPW12) are used, which have high integration and reliable performance, reducing the number and complexity of peripheral components; rectifier bridges DSS1 and DSS2 and related resistance networks are used for current detection, simplifying circuit design and reducing costs.

[0073] The peripheral devices connected to the master chip UMCU1, such as Flash, EEPROM, power supply circuit, wake-up sleep circuit, IO detection circuit, etc., share the resources of the master chip, avoiding repeated design and the use of redundant components; through a unified communication module (first and second CAN communication modules), multiple wireless communication modes (such as Bluetooth, 5G) are supported, improving the scalability and compatibility of the system, while reducing the procurement and maintenance costs of different communication modules.

[0074] The pre-charge circuit limits the initial current through a pre-charge resistor, effectively preventing damage to circuit components caused by large current surges, extending the service life of the components and reducing replacement and maintenance costs due to component damage; the phased operation mode (pre-charge phase and main power-on phase) ensures smooth transition when the system accesses the load, improves system reliability, reduces failure rate, and thus reduces long-term maintenance costs.

[0075] The use of standardized interfaces and module design allows batch procurement and use of general components during production, reducing procurement costs; standardized design also makes it easier to replace and upgrade some components without the need to redesign the entire system during product iteration and upgrade.

[0076] Real-time monitoring of battery pack and single battery temperature, SOH and SOC data feedback through temperature sensor, precise control and protection. This efficient thermal management and safety monitoring system reduces safety problems caused by overheating, thereby reducing additional costs due to safety problems.

[0077] In summary, through the above design and implementation strategies, the BMS all-in-one device not only achieves high integration and optimization in terms of functionality, thereby reducing material and manufacturing costs, but also ensures reliability, reducing maintenance and use costs, achieving both cost-effectiveness and product reliability.

[0078] The sampling unit 10 starts real-time collection of key parameters of the battery pack, including voltage, current and temperature; the master control unit 20 receives battery data from the sampling unit 10; analyzes and processes the collected data to evaluate the current state of the battery pack; based on the analysis results, the master control unit 20 decides the operation needed and outputs control signals: the on-board relay 30 executes the corresponding operation according to the received control signals.

[0079] The BMS all-in-one device can collect key parameters of the battery pack in real time, and monitor and control through the main control unit 20, realize the battery starting and pre-charging function, limit the initial current size, reduce the cost, reduce the single board BOM cost, and ensure the product reliability.

[0080] The above merely describes a specific implementation of the present application, but the protection scope of the present application is not limited to this. Any skilled person in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the present application, and these modifications or replacements should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A BMS all-in-one device, characterized in that: include: Sampling unit, main control unit and onboard relay connected to the battery pack; The sampling unit is used to collect key parameters of the battery pack, such as voltage, current, and temperature, in real time; the main control unit is used to monitor, control, and protect the battery status based on the data collected by the sampling unit, and output corresponding control signals; the onboard relay is used to realize the battery startup and battery pre-charging functions according to the control signal, and limit the initial current of the battery, wherein the sampling unit, main control unit, and onboard relay are respectively installed on the BMS board.

2. A BMS all-in-one device according to claim 1, characterized in that: The main control unit includes a main control chip UMCU1.

3. A BMS integrated device according to claim 2, characterized in that: The main control chip UMCU1 is further connected to a power supply circuit, a power supply wake-up sleep circuit and an IO detection circuit, and the power supply wake-up sleep circuit and the IO detection circuit are respectively connected to the power supply circuit.

4. The BMS integrated device according to claim 2, characterized in that: The main control chip UMCU1 is also connected to a first CAN communication module and a second CAN communication module.

5. The BMS integrated device according to claim 1, characterized in that: The sampling unit includes a battery total current acquisition subunit, a single cell voltage acquisition subunit, a balanced temperature acquisition subunit, and a temperature acquisition subunit. The battery total current acquisition subunit, the single cell voltage acquisition subunit, the balanced temperature acquisition subunit, and the temperature acquisition subunit are respectively connected to the main control unit. The battery total current acquisition subunit is used to collect the total current of the battery pack; The single cell voltage collection subunit is used to collect the voltage of the single cell; The balancing temperature acquisition subunit is used to collect the temperature of the single battery during passive balancing; The temperature collection subunit is used to collect the temperatures of all battery packs.

6. The BMS integrated device according to claim 5, characterized in that: It also includes an RTC timing unit, which is connected to the main control unit.

7. The BMS integrated device according to claim 5, characterized in that: The sampling unit further includes a pre-charge detection sub-unit, which is connected to the main control unit; the pre-charge detection sub-unit is used to detect whether the battery pack enters the pre-charge state.

8. The BMS integrated device according to claim 1, characterized in that: The onboard relay includes a first drive circuit, a pre-charging resistor, and a pre-charging relay; the first drive circuit is connected to the main control unit; the pre-charging relay is connected to the main control unit; and the pre-charging resistor is connected to the pre-charging relay.

9. The BMS integrated device according to claim 8, characterized in that: The onboard relay also includes a main positive relay and a second drive circuit; the main positive relay is connected to the pre-charging resistor and the pre-charging relay respectively; and the second drive circuit is connected to the main power supply.

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