A large capacity 12V BMS system based on AGV

Abstract

The utility model provides a kind of based on AGV car's large capacity 12VBMS system, belong to battery management technical field, propose following technical scheme, 4S lithium ion electric core, electric core positive terminal B+, electric core negative terminal B-, output positive terminal P+, output negative terminal P-, first resistance R1, second resistance R2, sampling resistance Shunt1, sampling resistance Shunt2;With electric core positive terminal B+ and electric core negative terminal B- electricity connection's electric core monitoring module U1;With electric core monitoring module U1 electricity connection's control module U2;With control module U2 electricity connection's current detection module U3 and voltage conversion module;There is three-terminal fuse in series between electric core positive terminal B+ and output positive terminal P+;The system realizes the design of total voltage acquisition, current acquisition and secondary protection based on the functional safety certification requirement of ISO13849, realizes the safety protection of low voltage, large capacity battery pack, improves safety.

Description

Technical Field

[0001] This utility model relates to the field of battery management technology, and more specifically, to a high-capacity 12VBMS system based on AGV vehicles. Background Technology

[0002] With the increasing industrial automation in factory workshops, Automated Guided Vehicles (AGVs) are widely used due to their high efficiency and accuracy, playing a very important role in transporting goods. The normal operation of AGVs largely depends on the Battery Management System (BMS).

[0003] Currently, most small and medium-sized AGV systems use 12V batteries as the mainstream power supply solution because of their strong voltage adaptability and relatively mature power management technology. However, in actual high-frequency, long-term continuous operation scenarios, on the one hand, it is difficult to balance battery capacity and output stability, and a sudden voltage drop during high-current discharge may cause AGV operation to be interrupted; on the other hand, frequent charging and discharging and improper management can easily lead to battery life degradation or even thermal runaway and other safety hazards. This system is responsible for monitoring the health status of the battery and ensuring safe charging and discharging, so as to ensure that the AGV can operate efficiently and improve work efficiency. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a high-capacity 12VBMS system based on AGV vehicles. The purpose and effectiveness of this utility model's high-capacity 12VBMS system based on AGV vehicles are achieved by the following specific technical means: A high-capacity 12VBMS system based on AGV vehicle includes 4S lithium-ion cells, cell positive terminal B+, cell negative terminal B-, output positive terminal P+, output negative terminal P-, first resistor R1, second resistor R2, sampling resistor Shunt1, sampling resistor Shunt2, and MOSFETs M1-M2. The cell monitoring module U1 is electrically connected to the positive terminal B+ and the negative terminal B- of the cell. Control module U2 is electrically connected to the cell monitoring module U1; The current detection module U3 and the voltage conversion module are electrically connected to the control module U2. A three-terminal fuse is connected in series between the positive terminal B+ of the battery cell and the positive terminal P+ of the output. A switching module, a sampling resistor Shunt1, and a sampling resistor Shunt2 are connected in series between the negative terminal B- of the battery cell and the negative terminal P- of the output. The negative terminal B- of the battery cell is connected to a zero-ohm resistor R3 and ground wire GND.

[0005] As a further embodiment of this utility model, the cell monitoring module U1 includes VCO-VC8 terminals, THM0-THM2 terminals, VBAT terminal, VCC terminal, SRP terminal, SRN terminal, DSG terminal, DSGD terminal, CHG terminal and CHGD terminal. The control module U2 includes GPIO, ACD, SPI, UART, CANH, and CANL terminals.

[0006] As a further embodiment of this utility model, the 4S lithium-ion battery cell includes cells B1-B4; The VC0-VC8 terminals of the cell monitoring module U1 are electrically connected to each node of the cells B1-B4, respectively. The thermistors NTC1-NTC3 are connected to the THM0-THM2 terminals of the cell monitoring module U1, respectively. The SRP and SRN terminals of the cell monitoring module U1 are both electrically connected to the sampling resistor Shunt1.

[0007] As a further embodiment of this utility model, the positive terminal B+ of the battery cell is electrically connected to the first resistor R1, the other end of the first resistor R1 is electrically connected to the second resistor R2 and the ADC terminal of the control module U2, one end of the second resistor R2 is electrically connected to the MOS transistor M1, and the other two ends of the MOS transistor M1 are respectively electrically connected to the ground GND and the GPIO terminal of the control module U2.

[0008] As a further embodiment of this utility model, the SPI terminal of the control module U2 is connected to an external chip interface Flash, the GPIO terminal of the control module U2 is connected to a signal interface WDI and a start / stop switch, the UART terminal and GPIO terminal of the control module U2 are simultaneously connected to a Bluetooth APP interface, the UART terminal of the control module U2 is connected to an RS485 interface, the ADC terminal of the control module U2 is connected to a thermistor NTC4, and both the CANH terminal and CANL terminal of the control module U2 are connected to a CAN interface.

[0009] As a further embodiment of this utility model, one end of the three-terminal fuse is connected to a heater, one end of the heater is electrically connected to the MOS transistor M2, and the other two ends of the MOS transistor M2 are electrically connected to the ground wire GND and the GPIO terminal of the control module U2, respectively.

[0010] As a further embodiment of this utility model, the cell monitoring module U1 and the current detection module U3 are both electrically connected to the control module U2 via the IIC bus; Both ends of the sampling resistor Shunt2 are electrically connected to the current detection module U3.

[0011] Based on the above aspects, this utility model has the following beneficial effects: Based on the functional safety certification requirements of ISO13849, this system implements the design of total voltage acquisition, current acquisition, and secondary protection, achieving safety protection for low voltage and large-capacity battery packs, thus improving safety. The dual sampling resistor setting improves the system's fault tolerance. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of a high-capacity 12VBMS system based on an AGV vehicle provided in this embodiment of the utility model. Detailed Implementation

[0013] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate the technical solution of this utility model, but should not be used to limit the scope of protection of this utility model.

[0014] As attached Figure 1 As shown: A high-capacity 12VBMS system based on AGV vehicles includes: 4S lithium-ion cell, cell positive terminal B+, cell negative terminal B-, output positive terminal P+, output negative terminal P-, first resistor R1, second resistor R2, sampling resistor Shunt1, sampling resistor Shunt2, MOSFETs M1-M2. The cell monitoring module U1 is electrically connected to the positive terminal B+ and the negative terminal B- of the cell. Specifically, the cell monitoring module U1 uses an AMG8803 chip. The control module U2 is electrically connected to the cell monitoring module U1. Specifically, the control module U2 adopts the model GD32F303RCT6. The current detection module U3 and the voltage conversion module are electrically connected to the control module U2. Specifically, the current detection module U3 is model INA226AIDGSR. A three-terminal fuse is connected in series between the positive terminal B+ of the battery cell and the positive terminal P+ of the output. A switching module, a sampling resistor Shunt1, and a sampling resistor Shunt2 are connected in series between the negative terminal B- of the battery cell and the negative terminal P- of the output. The negative terminal B- of the battery cell is connected to a zero-ohm resistor R3 and ground wire GND.

[0015] Furthermore, the cell monitoring module U1 includes VCO-VC8 terminals, THM0-THM2 terminals, VBAT terminal, VCC terminal, SRP terminal, SRN terminal, DSG terminal, DSGD terminal, CHG terminal, and CHGD terminal. The control module U2 includes GPIO, ACD, SPI, UART, CANH, and CANL terminals.

[0016] Furthermore, the 4S lithium-ion cell includes cells B1-B4; The VC0-VC8 terminals of the cell monitoring module U1 are electrically connected to each node of the cells B1-B4, respectively. The thermistors NTC1-NTC3 are connected to the THM0-THM2 terminals of the cell monitoring module U1, respectively. The SRP and SRN terminals of the cell monitoring module U1 are both electrically connected to the sampling resistor Shunt1.

[0017] Furthermore, the positive terminal B+ of the battery cell is electrically connected to the first resistor R1, the other end of the first resistor R1 is electrically connected to the second resistor R2 and the ADC terminal of the control module U2, one end of the second resistor R2 is electrically connected to the MOS transistor M1, and the other two ends of the MOS transistor M1 are electrically connected to the ground GND and the GPIO terminal of the control module U2, respectively.

[0018] Furthermore, the SPI terminal of the control module U2 is connected to an external chip interface Flash, the GPIO terminal of the control module U2 is connected to a signal interface WDI and a start / stop switch, the UART terminal and GPIO terminal of the control module U2 are both connected to a Bluetooth APP interface, the UART terminal of the control module U2 is connected to an RS485 interface, the ADC terminal of the control module U2 is connected to a thermistor NTC4, and both the CANH terminal and CANL terminal of the control module U2 are connected to a CAN interface.

[0019] Furthermore, one end of the three-terminal fuse is connected to a heater, one end of the heater is electrically connected to the MOS transistor M2, and the other two ends of the MOS transistor M2 are electrically connected to the ground wire GND and the GPIO terminal of the control module U2, respectively.

[0020] Furthermore, the cell monitoring module U1 and the current detection module U3 are both electrically connected to the control module U2 via the IIC bus, and both ends of the sampling resistor Shunt2 are electrically connected to the current detection module U3.

[0021] The voltage conversion module includes a buck converter (Buck), a low-dropout linear regulator (LDO), and a boost converter (Boost). The GIPO terminal of the control module U2 is electrically connected to the buck converter (Buck). One end of the buck converter (Buck) is simultaneously electrically connected to both the LDO and the Boost converter (Boost). Two sets of diodes are connected in parallel to one end of the LDO. One end of the Boost converter (Boost) is connected to a signal conversion module. The signal conversion module includes ENB, ENA, INA, INB, OUTA, and OUTB terminals. The GPIO terminal of the control module U2 is electrically connected to the ENA and ENB terminals of the signal conversion module. The DSG and CHG terminals of the cell monitoring module U1 are electrically connected to the INA and INB terminals of the signal conversion module, respectively. The DSGD and CHGD terminals of the cell monitoring module U1 are both electrically connected to the on / off module. The OUTA and OUTB terminals of the signal conversion module are both electrically connected to the on / off module.

[0022] In this embodiment, B+ / B- are the positive and negative electrodes of the 4S lithium-ion cell. The positive electrode B+ is output to P+ through a series three-terminal fuse, and the negative electrode B- is output to P- through a series sampling resistor Shunt1, a sampling resistor Shunt, and a switching module. P+ and P- are connected to a load or a charger. Direction 1 indicates that the 12V battery pack is discharging to the load, and direction 2 indicates that the charger is charging the 12V battery pack.

[0023] In this embodiment, the AMG8803 chip implements 4S cell voltage sampling and 3S cell temperature sampling.

[0024] Specifically, when the AMG8803 chip detects a cell voltage <2.5V or a cell voltage >3.6V, the 12VBMS transmits the undervoltage or overvoltage fault information to the host computer via RS485 communication. Maintenance personnel then perform troubleshooting based on the fault symptoms displayed on the host computer software. Similarly, when the AMG8803 chip detects a cell temperature <-10℃ or a cell temperature >60℃, the 12VBMS transmits the undertemperature or overtemperature fault information to the host computer via RS485 communication. Maintenance personnel then perform troubleshooting based on the fault symptoms displayed on the host computer software.

[0025] In this embodiment, the total voltage of the 4S lithium-ion cell needs to be above 8V. If the voltage is below 8V, the 12VBMS will not work properly.

[0026] In this embodiment, when the current pin of the AMG8803 chip detects a 220A charging circuit for 500ms, the host computer software displays an overcharge fault, disconnects the main circuit of the negative MOSFET, and B- and P- are in an open circuit state with no voltage output.

[0027] When the current pin of the AMG8803 chip detects a discharge overcurrent of 1: 300A for 2 seconds and a discharge overcurrent of 2: 400A for 100ms, the host computer software reports an over-discharge fault, disconnects the main circuit of the negative MOSFET, and B- and P- are in an open circuit state, resulting in no voltage output.

[0028] In this embodiment, when the current pin of the AMG8803 chip detects a current of 800A for a duration of 152us, the host computer software reports a short circuit fault on the load side P+ / P-, disconnects the main circuit of the negative MOSFET, and B- and P- are in an open circuit state with no voltage output.

[0029] When the error between the current detected by the AMG8803 chip and the current detected by the MCU exceeds 150A±3%, the host computer software reports a current acquisition fault.

[0030] When the error between the total voltage detected by the AMG8803 chip and the total voltage detected by the MCU exceeds 1V, the host computer software reports a total voltage acquisition failure.

[0031] It should be understood that the term "and / or" in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A alone, A and B simultaneously, and B alone. A and B can be singular or plural. Additionally, the character " / " in this article generally indicates an "or" relationship between the preceding and following related objects, but it can also represent an "and / or" relationship. Please refer to the context for a more accurate understanding.

[0032] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be included within the protection scope of this utility model.

Claims

1. A high-capacity 12VBMS system based on AGV vehicles, characterized in that, include: 4S lithium-ion cell, cell positive terminal B+, cell negative terminal B-, output positive terminal P+, output negative terminal P-, first resistor R1, second resistor R2, sampling resistor Shunt1, sampling resistor Shunt2, MOSFETs M1-M2. The cell monitoring module U1 is electrically connected to the positive terminal B+ and the negative terminal B- of the cell. Control module U2 is electrically connected to the cell monitoring module U1; The current detection module U3 and the voltage conversion module are electrically connected to the control module U2. A three-terminal fuse is connected in series between the positive terminal B+ of the battery cell and the positive terminal P+ of the output. A switching module, a sampling resistor Shunt1, and a sampling resistor Shunt2 are connected in series between the negative terminal B- of the battery cell and the negative terminal P- of the output. The negative terminal B- of the battery cell is connected to a zero-ohm resistor R3 and ground wire GND.

2. The high-capacity 12VBMS system based on AGV vehicles as described in claim 1, characterized in that: The cell monitoring module U1 includes VCO-VC8 terminals, THM0-THM2 terminals, VBAT terminal, VCC terminal, SRP terminal, SRN terminal, DSG terminal, DSGD terminal, CHG terminal, and CHGD terminal. The control module U2 includes GPIO, ACD, SPI, UART, CANH, and CANL terminals.

3. The high-capacity 12VBMS system based on AGV vehicles as described in claim 2, characterized in that: The 4S lithium-ion battery cell includes cells B1-B4; The VC0-VC8 terminals of the cell monitoring module U1 are electrically connected to each node of the cells B1-B4, respectively. The thermistors NTC1-NTC3 are connected to the THM0-THM2 terminals of the cell monitoring module U1, respectively. The SRP and SRN terminals of the cell monitoring module U1 are both electrically connected to the sampling resistor Shunt1.

4. A high-capacity 12VBMS system based on AGV vehicles as described in claim 3, characterized in that: The positive terminal B+ of the battery cell is electrically connected to the first resistor R1. The other end of the first resistor R1 is electrically connected to the second resistor R2 and the ADC terminal of the control module U2. One end of the second resistor R2 is electrically connected to the MOS transistor M1. The other two ends of the MOS transistor M1 are electrically connected to the ground GND and the GPIO terminal of the control module U2, respectively.

5. A high-capacity 12VBMS system based on AGV vehicles as described in claim 4, characterized in that: The SPI terminal of the control module U2 is connected to an external chip interface Flash. The GPIO terminal of the control module U2 is connected to a signal interface WDI and a start / stop switch. The UART terminal and GPIO terminal of the control module U2 are also connected to a Bluetooth APP interface. The UART terminal of the control module U2 is connected to an RS485 interface. The ADC terminal of the control module U2 is connected to a thermistor NTC4. The CANH terminal and CANL terminal of the control module U2 are both connected to a CAN interface.

6. A high-capacity 12VBMS system based on AGV vehicles as described in claim 5, characterized in that: One end of the three-terminal fuse is connected to a heater, and one end of the heater is electrically connected to the MOS transistor M2. The other two ends of the MOS transistor M2 are electrically connected to the ground wire GND and the GPIO terminal of the control module U2, respectively.

7. A high-capacity 12VBMS system based on AGV vehicles as described in claim 1, characterized in that: The cell monitoring module U1 and the current detection module U3 are both electrically connected to the control module U2 via the IIC bus. Both ends of the sampling resistor Shunt2 are electrically connected to the current detection module U3.

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